WO2014057691A1 - Handover determination device, handover control device, handover determination method, handover control method, handover determination program, and handover control program - Google Patents

Handover determination device, handover control device, handover determination method, handover control method, handover determination program, and handover control program Download PDF

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Publication number
WO2014057691A1
WO2014057691A1 PCT/JP2013/006104 JP2013006104W WO2014057691A1 WO 2014057691 A1 WO2014057691 A1 WO 2014057691A1 JP 2013006104 W JP2013006104 W JP 2013006104W WO 2014057691 A1 WO2014057691 A1 WO 2014057691A1
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WIPO (PCT)
Prior art keywords
handover
mobile terminal
command
call
request
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PCT/JP2013/006104
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French (fr)
Japanese (ja)
Inventor
亜希 大橋
和仁 徳永
健太 大西
圭祐 笹田
Original Assignee
株式会社Ｎｔｔドコモ
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Priority to JP2014540758A priority Critical patent/JP6063473B2/en
Publication of WO2014057691A1 publication Critical patent/WO2014057691A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface

Definitions

  • the present invention relates to a handover determination device, a handover control device, a handover determination method, a handover control method, a handover determination program, and a handover control program for controlling a handover that occurs when mobile terminals in a call move between different network communication networks.
  • a handover determination device a handover control device, a handover determination method, a handover control method, a handover determination program, and a handover control program for controlling a handover that occurs when mobile terminals in a call move between different network communication networks.
  • Non-Patent Document 1 defines an incoming call procedure by IMS (for example, incoming voice call).
  • IMS IP Multimedia Subsystem
  • LTE Long Term Evolution
  • 3G Third Generation, third generation mobile communication system
  • the LTE network is in a stage where communication facilities such as corresponding base stations are sequentially installed.
  • the LTE network often has a narrower service area than the 3G network in which many communication facilities are already installed.
  • SRVCC Single Radio Voice Call Continuity
  • Non-Patent Document 3 which is a standardization material related to SRVCC
  • SRVCC is an operation in which the state of a voice call of a mobile terminal is limited during a voice call, and transmission until a voice call is in progress. There is no provision for the operation of SRVCC during middle, incoming call, guidance or ringing.
  • the aSRVCC (alerting4SRVCC), which is the SRVCC when the voice call state of the mobile terminal is in the ringing state, is specified in Releases 10 and later of Non-Patent Documents 3 and 4.
  • the mobile terminal needs to support aSRVCC.
  • Non-Patent Documents 3 and 4 Stipulated in Release 12 and later.
  • the voice call state of the mobile terminal is a guidance in-progress state transmitted after the call is established, the SRVCC operation is performed as in the case of a voice call.
  • FIG. 11A is a sequence diagram showing the operation of the conventional SRVCC in the outgoing call state
  • FIG. 11B is a schematic diagram showing the relationship between the service areas of the LTE network and the 3G network.
  • a mobile terminal (UE: User Equipment) 30 communicates with a base station equipment (eNB: eNodeB) 40 of the LTE network 10 and is near the boundary of the service area of the LTE network 10. It is assumed that the user is in the service area of the 3G network 20.
  • UE User Equipment
  • eNB eNodeB
  • a call control device 70 such as S-CSCF or P-CSCF included in an IMS network (IMS NW) 50 performs call control of the mobile terminal 30.
  • the mobile terminal 30 is in a state (before transmission) before a bearer for voice call is established.
  • a call for making a voice call with the partner mobile terminal is started. It is assumed that the transmission side user starts from the vicinity of the boundary of the service area of the LTE network 10 and moves to the end of the area along with the mobile terminal 30 while starting the transmission. Since the mobile terminal 30 has moved near the end of the area of the LTE network 10, the radio quality from the LTE network 10 deteriorates. Therefore, the mobile terminal 30 transmits to the base station device 40 the wireless quality information 32 indicating that the current wireless quality has fallen below the threshold value of the wireless quality specified by the base station device 40 at time t1.
  • the base station device 40 determines that the voice call of the mobile terminal 30 is handed over from the LTE network 10 to the 3G network 20 to continue the call.
  • the base station device 40 transmits a handover request 132 for handing over the mobile terminal 30 from the LTE network 10 to the 3G network 20 to an MME (Mobile Management Entity) 42.
  • the MME 42 transmits an SRVCC request to the IMS network 50 via an MSC (Multimedia Switching Center) Server 44.
  • the IMS network 50 sends an SRVCC response via the MSC Server 44 that causes the mobile terminal 30 to SRVCC from the LTE network 10 to the 3G network 20 even though the voice call state of the mobile terminal 30 is in the outgoing state.
  • the MME 42 transmits a handover response command 252 to the base station device 40. Since the base station device 40 has received the handover response command 252, the base station device 40 transmits a handover instruction 152 to the mobile terminal 30 at time t 4. At time t5, the mobile terminal 30 executes a handover.
  • 3GPP The 3rd Generation Partnership Project
  • TS23.228 3GPP (The 3rd Generation Partnership Project) TS23.216
  • 3GPP The 3rd Generation Partnership Project
  • TS24.237 3GPP (The 3rd Generation Partnership Project) TS23.237
  • the mobile terminal 30 is still in a calling state and not in a calling state.
  • the operation of SRVCC when not in a call state is not defined in Non-Patent Document 3 (particularly Release 9).
  • the IMS network 50 cannot correctly perform SRVCC to the 3G NW 60.
  • the mobile terminal 30 is in a state where the voice protocol cannot be converted from the SIP protocol used in the IMS network 50 to the CC protocol to be used in the 3G NW 60, which may lead to call disconnection, And the IMS network 50 may become inconsistent.
  • the present invention has been made to solve the above-described problems of the prior art, and its purpose is to hand over a mobile terminal when a voice call state does not comply with the SRVCC regulations. Can prevent call disconnection of the mobile terminal and state mismatch between the mobile terminal and the IMS network, and further suppress transmission of unnecessary handover requests, thereby preventing the base station device and the IMS network from transmitting. It is to provide a handover determination device, a handover control device, a handover determination method, a handover control method, a handover determination program, and a handover control program that can reduce useless traffic.
  • a handover determination apparatus is capable of making a voice call or a video call between a first network communication network and a second network communication network having a common service area with the first network communication network.
  • a handover determination apparatus that receives a request for handover of a mobile terminal from a handover control apparatus, wherein a degradation in radio quality of the mobile terminal is detected during a voice call or a video call in the first network communication network.
  • a handover request for handing over the mobile terminal from the first network communication network to the second network communication network and continuing a call or a request based on the handover request is received from the handover control apparatus.
  • a handover request receiving unit When the request reception unit receives the handover request or the request based on the handover request, the call state acquisition unit that acquires the call state of the mobile terminal, and the mobile terminal performs the handover in the call state.
  • a mobile terminal information acquisition unit that acquires mobile terminal information including information on whether or not the mobile terminal is a possible mobile terminal, the call state acquired by the call state acquisition unit, and the mobile terminal information acquisition unit Based on the acquired mobile terminal information, if the mobile terminal is not capable of handover in the call state, it is determined that handover is not possible, and the mobile terminal is capable of handover in the call state.
  • the command transmission unit further outputs a handover suppression command for causing the handover control device to suppress transmission of the handover request when the handover determination unit determines that handover is not possible.
  • a handover for causing the handover control device to cancel the suppression of transmission of the handover request when the handover determination unit determines that a handover is possible after transmitting the handover suppression command to the handover control device A suppression release command may be transmitted.
  • the handover control apparatus can suppress transmission of a handover request, so that the mobile terminal is handed over when the call state does not comply with the SRVCC regulations. Can prevent call disconnection of the mobile terminal and state mismatch between the mobile terminal and the IMS network, and further suppress transmission of an unnecessary handover request, thereby preventing the base station device and the IMS network from transmitting. Unnecessary traffic can be reduced.
  • a handover control apparatus is capable of making a voice call or a video call between a first network communication network and a second network communication network having a common service area with the first network communication network.
  • a handover control apparatus that transmits a request for handover of a mobile terminal to a handover determination apparatus, wherein the radio quality information receives radio quality information transmitted by the mobile terminal residing in the first network communication network A reception unit; a radio quality determination unit that determines whether or not the radio quality of the mobile terminal in the first network communication network is degraded based on the radio quality information; and the radio quality determination unit includes the mobile terminal If it is determined that the wireless quality of the mobile device has deteriorated, the mobile terminal is moved from the first network communication network to the second network.
  • a handover request transmission unit for transmitting a handover request for continuing a call by handover to a work communication network to the handover determination device, and a response from the handover determination device to the handover request transmitted by the handover request transmission unit.
  • a command receiving unit that receives a handover response command, and a handover response unit that, when the command receiving unit receives the handover response command for performing the handover, transmits a handover instruction for causing the mobile terminal to perform the handover
  • a handover rejection unit that does not transmit the handover instruction to the mobile terminal when the command reception unit receives a handover rejection command for preventing the handover from being performed, and the command reception unit
  • a handover suppression command for suppressing transmission of a handover request is received, the handover request transmission unit is not operated, and the command reception unit receives a handover suppression cancellation command for canceling suppression of transmission of the handover request.
  • a handover request transmission limiting unit that operates the handover request transmission unit.
  • a handover determination method is capable of making a voice call or a video call between a first network communication network and a second network communication network having a common service area with the first network communication network.
  • a handover determination method for receiving a request for handover of a mobile terminal from a handover control apparatus, wherein degradation of radio quality of the mobile terminal is detected during a voice call or a video call in the first network communication network
  • a handover request for handing over the mobile terminal from the first network communication network to the second network communication network and continuing a call or a request based on the handover request is received from the handover control apparatus.
  • Mobile terminal information acquisition step of acquiring mobile terminal information including information on whether or not the mobile terminal is capable of, and the call state and mobile terminal information acquisition step of the call state acquisition step If the mobile terminal is not capable of the handover in the call state based on the mobile terminal information acquired by the mobile terminal, the mobile terminal determines that the handover is not possible, and the mobile terminal capable of the handover in the call state If there is a handover determination step for determining that handover is possible, and if the handover determination step determines that handover is not possible Transmits a handover reject command for preventing the handover control apparatus from performing the handover, and when the handover determination step determines that a handover is possible, a handover response command for causing the handover control apparatus to perform the handover And a command
  • a handover control method enables a voice call or a video call between a first network communication network and a second network communication network having a common service area with the first network communication network.
  • a handover control method for transmitting a request for handover of a mobile terminal to a handover determination device, wherein the radio quality information is received for the radio quality information transmitted by the mobile terminal residing in the first network communication network.
  • a handover request transmission step for transmitting a handover request for continuing a call by handing over to a network communication network to the handover determination device; and a response from the handover determination device to the handover request transmitted by the handover request transmission step.
  • a command receiving step for receiving an incoming handover response command, and a handover response step for sending a handover instruction for causing the mobile terminal to execute the handover when the command receiving step receives the handover response command for causing the handover to be performed
  • a handover rejection step of not transmitting the handover instruction to the mobile terminal when the command reception step receives a handover rejection command for preventing the handover from being performed, and
  • the command reception step receives a handover suppression command for suppressing transmission of the handover request
  • the handover request transmission step is not operated, and the command reception step cancels suppression of transmission of the handover request.
  • a handover request transmission restriction step of operating the handover request transmission step when a suppression release command is received.
  • the state of the mobile terminal call, the mobile terminal information indicating whether handover is possible even when the mobile terminal call state is ringing, and whether the handover is possible are determined. Since the handover can be controlled based on the command from the handover determination device to be performed and the transmission of the handover request can be suppressed based on the command from the handover determination device during the period when the handover cannot be performed, the call state corresponds to the SRVCC regulation. In this case, it is possible to prevent call disconnection of the mobile terminal due to handover of the mobile terminal in the absence of the mobile terminal and state mismatch between the mobile terminal and the IMS network, and further suppress transmission of an unnecessary handover request. Can reduce wasted traffic between base station equipment and IMS network Kill.
  • a handover determination program enables a voice call or a video call between a first network communication network and a second network communication network having a common service area with the first network communication network.
  • a handover determination program for receiving a request for handover of a mobile terminal from a handover control device, wherein the wireless quality of the mobile terminal is degraded during a voice call or a video call over the first network communication network.
  • Handover received from A reception request step a call state acquisition step of acquiring a call state of the mobile terminal when the handover request reception step receives the handover request or a request based on the handover request, and the mobile terminal
  • a mobile terminal information acquisition step of acquiring mobile terminal information including information on whether or not the mobile terminal is capable of handover in a call state; the call state acquired in the call state acquisition step; and Based on the mobile terminal information acquired in the mobile terminal information acquisition step, if the mobile terminal is not capable of handover in the call state, it is determined that handover is not possible, and the handover is not performed in the call state.
  • a handover determination step for determining that handover is possible When the handover determination step determines that handover is not possible, a handover rejection command for not causing the handover control apparatus to perform the handover is transmitted, and when the handover determination step determines that handover is possible, the handover control apparatus And a command transmission step of transmitting a handover response command for performing the handover.
  • this configuration it is possible to determine whether or not handover can be performed based on the call state of the mobile terminal and the mobile terminal information indicating whether or not handover is possible in the call state of the mobile terminal. , It is possible to prevent call disconnection of the mobile terminal due to handover of the mobile terminal when the call state does not comply with the SRVCC regulation and state mismatch between the mobile terminal and the IMS network. .
  • a handover control program enables a voice call or a video call between a first network communication network and a second network communication network having a common service area with the first network communication network.
  • a handover control program for transmitting a request for handover of a mobile terminal to a handover determination device, wherein the computer receives radio quality information transmitted by the mobile terminal residing in the first network communication network
  • the mobile terminal is A handover request transmission step for transmitting a handover request for continuing a call by handover from the first network communication network to the second network communication network, and the handover request transmission step transmitted by the handover request transmission step.
  • the command reception step does not operate the handover request transmission step.
  • a handover suppression release command for canceling suppression of transmission of the handover request is received, a handover request transmission restriction step for operating the handover request transmission step is executed.
  • the state of the mobile terminal call, the mobile terminal information indicating whether handover is possible even when the mobile terminal call state is ringing, and whether the handover is possible are determined. Since the handover can be controlled based on the command from the handover determination device to be performed and the transmission of the handover request can be suppressed based on the command from the handover determination device during the period when the handover cannot be performed, the call state corresponds to the SRVCC regulation. In this case, it is possible to prevent call disconnection of the mobile terminal due to handover of the mobile terminal in the absence of the mobile terminal and state mismatch between the mobile terminal and the IMS network, and further suppress transmission of an unnecessary handover request. Can reduce wasted traffic between base station equipment and IMS network Kill.
  • the call status of the mobile terminal the mobile terminal information indicating whether or not handover is possible in the call status of the mobile terminal, and the handover determination device for determining whether or not the handover is possible
  • the handover can be controlled based on the command from the mobile station, and the transmission of the handover request can be suppressed based on the command from the handover determination device during the period when the handover is not possible. It is possible to prevent call disconnection of the mobile terminal due to handover of the terminal and state mismatch between the mobile terminal and the IMS network, and further, by suppressing transmission of unnecessary handover requests, the base station Wasteful traffic between the device and the IMS network can be reduced.
  • 4 is a flowchart showing an operation of a handover determination unit of the handover determination apparatus according to the first embodiment of the present invention.
  • 3 is a flowchart showing the operation of the handover control apparatus according to the first embodiment of the present invention. It is a sequence diagram which shows operation
  • FIG. 1 is a configuration diagram illustrating configurations of a handover determination device 200 and a handover control device 100 according to the first embodiment.
  • a mobile terminal (UE: User Equipment) 30 is a service common to the LTE (Long Term Evolution) network 10 which is a first network communication network and the first network communication network.
  • a voice call or a video call can be made with a 3G (3rd generation, third generation mobile communication system) network 20 which is a second network communication network having an area.
  • the LTE network 10 includes a base station device (eNB: eNodeB) 40, an MME (Mobile Management Entity) 42, an MSC (Multimedia Switching Center) Server 44, and an IMS (IP Multimedia Subsystem) network (IMS NW) 50 shown in FIG. Is included.
  • the 3G network 20 includes a 3G network (3G NW) 60.
  • FIG. 1B shows the relationship between the current service area of the LTE network 10 and the service area of the 3G network 20. As shown in FIG. 1B, the service area of the LTE network 10 is common to the service area of the 3G network 20 and is narrower than the service area of the 3G network 20.
  • the base station device 40 includes a handover control apparatus 100.
  • the IMS network 50 includes a handover determination device 200, a call control device 70 including a S-CSCF (Serving Call Session Control Function) and a P-CSCF (Proxy Call Session Control Function), and a home subscriber server (HSS: Mobile terminal information management device 80 configured by Home Subscriber Server) and the like.
  • the handover control apparatus 100 includes a radio quality information receiving unit 110, a radio quality determination unit 120, a handover request transmission unit 130, a command reception unit 140, a handover response unit 150, and a handover rejection unit 160.
  • the handover determination apparatus 200 includes a handover request reception unit 210, a call state acquisition unit 220, a mobile terminal information acquisition unit 230, a handover determination unit 240, and a command transmission unit 250.
  • the mobile terminal 30 includes a radio network quality information 32 included in the base station device 40 when the radio quality value in the LTE network 10 is lower than the radio quality threshold specified by the base station device 40. 100 wireless quality information receivers 110.
  • the radio quality determination unit 120 determines whether the radio quality of the mobile terminal 30 has deteriorated based on the radio quality information 32 received by the radio quality information reception unit 110.
  • the handover request transmission unit 130 transmits a handover request 132 for handing over the mobile terminal 30 from the LTE network 10 to the 3G network 20 to the MME 42.
  • the MME 42 transmits the SRVCC request to the handover request receiving unit 210 of the handover determination device 200 included in the IMS network 50 via the MSC Server 44.
  • the handover request receiver 210 of the handover determination device 200 receives an SRVCC request based on the handover request 132 transmitted from the handover request transmitter 130.
  • the call state acquisition unit 220 acquires the call state of the mobile terminal 30 from the call control device 70 that monitors the call state of the mobile terminal 30. Examples of the call state include a calling state, a ringing state, an incoming call state, a call state, and an interrupt call state.
  • the calling state is a state immediately after the mobile terminal 30 starts sending.
  • the in-calling state is a state in which the calling party mobile terminal 30 is calling the other party after the calling state and before the originating mobile terminal 30 establishes communication with the other party mobile terminal.
  • the calling state is a state in which a call is made until the called terminal receives an incoming call and responds to the incoming call.
  • the incoming call state is a state before the incoming mobile terminal receives an incoming call and before calling.
  • the in-call state is a state in which a voice call or a video call can be made with a partner mobile terminal.
  • An interrupt call state is a state in which a call can be made with another mobile terminal that has been received later while the call with the other party's mobile terminal is on hold (interrupt call). For example, “Catch Phone” (referred to as a call using a service registered by Nippon Telegraph and Telephone Corporation).
  • the mobile terminal information acquisition unit 230 is a mobile terminal having an aSRVCC (alerting SRVCC) -compatible mobile terminal capable of performing handover even when the mobile terminal 30 is in a ringing state (that is, a mobile terminal having aSRVCC function).
  • Mobile terminal information is acquired from the mobile terminal information management device 80.
  • the mobile terminal information acquisition unit 230 is a bSRVCC (SRVCC before ringing) compatible mobile device that can perform handover even when the mobile terminal 30 is in a guidance state that is transmitted in a state before the call is established.
  • the mobile terminal information is acquired from the mobile terminal information management device 80 as to whether or not the terminal is a terminal (that is, a mobile terminal having a bSRVCC function).
  • the handover determination unit 240 determines whether or not handover is possible based on the call state of the mobile terminal 30 acquired by the call state acquisition unit 220 and the mobile terminal information acquired by the mobile terminal information acquisition unit 230. .
  • the command transmission unit 250 transmits an SRVCC response for causing the handover control apparatus 100 to perform the handover to the MME 42 via the MSC Server 44.
  • the MME 42 transmits a handover response command 252 based on the SRVCC response to the command receiving unit 140 of the handover control apparatus 100.
  • the command transmission unit 250 transmits an SRVCC rejection for preventing the handover control apparatus 100 from performing the handover to the MME 42 via the MSC Server 44.
  • the MME 42 transmits a handover rejection command 262 based on the SRVCC rejection to the command receiving unit 140 of the handover control apparatus 100.
  • the command reception unit 140 of the handover control apparatus 100 receives the handover response command 252 and the handover rejection command 262 that are transmitted by the command transmission unit 250 of the handover determination apparatus 200. If the command received by the command receiver 140 includes the handover response command 252, the handover response unit 150 transmits a handover instruction 152 for causing the mobile terminal 30 to execute the handover. The handover rejection unit 160 does not transmit the handover instruction 152 to the mobile terminal 30 when the handover rejection command 262 is included in the command received by the command reception unit 140.
  • FIG. 2 is a flowchart showing the operation of the handover determination apparatus 200 according to the first embodiment.
  • the SRVCC specified in Release 9 of Non-Patent Document 3 and the aSRVCC compatible terminal specified in Release 10 of Non-Patent Documents 3 and 4 are capable of handover even when the call state is ringing.
  • a case will be described in which a certain mobile terminal 30 acquires a voice call (performs a voice call) and determines whether or not handover is possible based on the state of the voice call and mobile terminal information. As shown in FIG.
  • step S202 the handover request reception unit 210 waits until it receives an SRVCC request based on the handover request 132 transmitted from the handover request transmission unit 130, and sends an SRVCC request based on the handover request 132. If received, the process proceeds to step S204.
  • step S204 the mobile terminal information acquisition unit 230 displays mobile terminal information indicating whether or not the mobile terminal 30 is an aSRVCC compatible terminal that can be handed over even when the voice call state is ringing. Obtained from the machine information management device 80. Thereafter, the process proceeds to step S206. If the mobile terminal information acquisition unit 230 has already acquired the mobile terminal information of the mobile terminal 30 from the mobile terminal information management device 80, the process of step S204 may not be performed.
  • the mobile terminal information acquisition unit 230 may determine whether the mobile terminal 30 is a terminal that can be handed over even when the voice call is in an incoming call state, and whether the voice call status is You may make it acquire from the mobile terminal information management apparatus 80 the mobile terminal information of whether it is a terminal which can be handed over in the state in the middle of transmission.
  • step S206 the call state acquisition unit 220 displays the state of the voice call of the mobile terminal 30 (calling / calling / incoming / calling / interrupt call etc.) and the state of the voice call of the mobile terminal 30. Obtained from the monitored call control device 70. Thereafter, the process proceeds to step S208. Even if the order of step S204 and step S206 is reversed (that is, when the handover request 132 is received in step S202, the process proceeds to step S206, proceeds to step S204, and proceeds to step S208). Also) In step S208, the handover determination unit 240 is executed. Thereafter, the process proceeds to step S210.
  • step S210 when the handover determining unit 240 determines that a handover is possible, the process proceeds to step S212. On the other hand, when the handover determining unit 240 determines that the handover is not possible in step S210, the process proceeds to step S214.
  • step S212 by executing the command transmission unit 250, an SRVCC response for performing the handover is transmitted to the MME 42 via the MSC Server 44.
  • the MME 42 transmits a handover response command 252 based on the SRVCC response to the command receiving unit 140 of the handover control apparatus 100. Thereafter, the process proceeds to step S202.
  • step S214 by executing the command transmission unit 250, an SRVCC rejection not to perform the handover is transmitted to the MME 42 via the MSC Server 44.
  • the MME 42 transmits a handover rejection command 262 based on the SRVCC rejection to the command receiving unit 140 of the handover control apparatus 100. Thereafter, the process proceeds to step S202.
  • FIG. 3 is a flowchart showing the operation of the handover determination unit 240.
  • the mobile terminal 30 acquires a voice call (performs a voice call) and determines whether or not handover is possible based on the voice call state and the mobile terminal information.
  • step S242 whether the state of the voice call of the mobile terminal 30 is an outgoing call state, an incoming call state, a ringing state, a busy state, or an interrupted call state.
  • step S246 It is determined in which state, and if the voice call state of the mobile terminal 30 is the outgoing call state, the process proceeds to step S246.
  • step S242 if the state of the voice call of the mobile terminal 30 is an incoming call state, the process proceeds to step S246.
  • step S242 if the voice call state of the mobile terminal 30 is a ringing state, the process proceeds to step S244.
  • step S242 if the voice call state of the mobile terminal 30 is a busy state, the process proceeds to step S248.
  • step S24248 if the state of the voice call of the mobile terminal 30 is an interrupt call state, the process proceeds to step S248.
  • step S244 it is determined whether or not the mobile terminal information of the mobile terminal 30 is an aSRVCC compatible terminal capable of performing handover even when the voice call state is ringing.
  • the process proceeds to step S248.
  • step S244 it is determined that the handover is not possible, and the process of the handover determination unit 240 ends.
  • step S248 it is determined that the handover is possible, and the processing of the handover determination unit 240 is terminated.
  • FIG. 3A it has been described that it is determined whether or not the terminal is an aSRVCC compatible terminal capable of performing handover even in the ringing state. However, as shown in FIG. It may be determined whether or not the terminal is capable of receiving (step S250), or it may be determined whether or not the terminal is capable of SRVCC even in the outgoing call state (step S252).
  • FIG. 4 is a flowchart showing the operation of the handover control apparatus 100 according to the first embodiment.
  • the wireless quality information receiving unit 110 waits until it receives the wireless quality information 32, and when it is received, the process proceeds to step S104.
  • the radio quality determination unit 120 determines whether or not the mobile terminal 30 needs to be handed over based on the radio quality information 32. If necessary, the radio quality determination unit 120 proceeds to step S106. On the other hand, if there is no need for handover in step S104, the process proceeds to step S102.
  • step S106 the handover request transmitter 130 transmits the handover request 132 to the MME 42.
  • the MME 42 transmits the SRVCC request to the handover request receiving unit 210 via the MSC Server 44.
  • Step S108 the process waits until the command receiving unit 140 receives a command. When the command is received, the process proceeds to step S110.
  • step S110 it is determined whether the command received by the command receiver 140 is a handover response command 252. If the command is a handover response command 252, the process proceeds to step S112. On the other hand, if it is not the handover response command 252 (that is, the handover rejection command 262) in step S110, the process proceeds to step S114. In step S112, the handover response unit 150 is executed, and a handover instruction 152 is transmitted to the mobile terminal 30. Thereafter, the process proceeds to step S102. Meanwhile, in step S114, the handover rejection unit 160 is executed, and the handover instruction 152 for causing the mobile terminal 30 to perform the handover is not transmitted. Thereafter, the process proceeds to step S102.
  • FIG. 5 is a sequence diagram illustrating operations of the handover determination device 200 and the handover control device 100 according to the first embodiment.
  • the mobile terminal 30 acquires a voice call (performs a voice call) and determines whether or not handover is possible based on the voice call state and the mobile terminal information.
  • the mobile terminal 30 is an aSRVCC compatible mobile terminal that can be handed over even when the voice call is ringing, and is located near the boundary of the LTE network 10 service area and within the 3G network 20 service area. (Refer FIG. 1 (B)), it demonstrates as what is communicating with the base station apparatus 40 of the LTE network 10.
  • FIG. 5 the mobile terminal 30 is in a state (during outgoing) before a bearer for voice call is established at time t0.
  • a call for making a voice call with the counterpart mobile terminal is started.
  • the mobile terminal 30 transmits to the base station device 40 the wireless quality information 32 indicating that the current wireless quality is below the threshold value of the wireless quality specified by the base station device 40. .
  • the radio quality information receiving unit 110 of the handover control device 100 included in the base station device 40 receives the radio quality information 32 (step S102 in FIG. 4).
  • the radio quality determination unit 120 determines that the mobile terminal 30 needs to be handed over based on the radio quality information 32 (step S104 in FIG. 4).
  • the handover request transmission unit 130 transmits a handover request 132 to the MME 42.
  • the MME 42 transmits the SRVCC request to the handover request receiving unit 210 via the MSC Server 44 (Step S106 in FIG. 4).
  • the handover request receiving unit 210 receives an SRVCC request based on the handover request 132 (step S202 in FIG. 2).
  • the mobile terminal information acquisition unit 230 stores mobile terminal information indicating whether or not the mobile terminal 30 is an aSRVCC compatible terminal that can be handed over even when the voice call is ringing. 80 (step S204 in FIG. 2).
  • the call state acquisition unit 220 acquires that the state of the voice call of the mobile terminal 30 is a calling state (step S206 in FIG. 2).
  • the handover determination unit 240 determines that the handover is not possible because the voice call state of the mobile terminal 30 is the outgoing call state and the mobile terminal 30 is not at a timing corresponding to SRVCC (step S208 in FIG. 2). .
  • an SRVCC rejection for not performing the handover is transmitted to the MME 42 via the MSC Server 44.
  • the MME 42 transmits a handover rejection command 262 based on the SRVCC rejection to the command receiving unit 140 of the handover control apparatus 100 (step S214 in FIG. 2).
  • the handover control apparatus 100 executes the handover rejection unit 160 and does not transmit the handover instruction 152 for causing the mobile terminal 30 to perform the handover (step S114 in FIG. 4).
  • the state of the voice call of the mobile terminal 30 changes to the ringing state.
  • the mobile terminal 30 transmits to the base station device 40 the wireless quality information 32 indicating that the current wireless quality is still below the wireless quality threshold specified by the base station device 40.
  • the radio quality information receiving unit 110 of the handover control device 100 included in the base station device 40 receives the radio quality information 32 (step S102 in FIG. 4).
  • the radio quality determination unit 120 determines that the mobile terminal 30 needs to be handed over based on the radio quality information 32 (step S104 in FIG. 4).
  • the handover request transmission unit 130 transmits a handover request 132 to the MME 42.
  • the MME 42 transmits the SRVCC request to the handover request receiving unit 210 via the MSC Server 44 (Step S106 in FIG. 4).
  • the handover request receiving unit 210 receives the SRVCC request based on the handover request 132 (step S202 in FIG. 2).
  • the mobile terminal information acquisition unit 230 has already acquired mobile terminal information.
  • the call state acquisition unit 220 acquires that the voice call state of the mobile terminal 30 is a ringing state (step S206 in FIG. 2).
  • the handover determining unit 240 is an aSRVCC compatible terminal capable of performing handover even when the voice call state of the mobile terminal 30 is in the ringing state and the mobile terminal information of the mobile terminal 30 is in the ringing state of the voice call. Therefore, it is determined that handover is possible (step S208 in FIG. 2).
  • the SRVCC response is transmitted to the MME 42 via the MSC Server 44.
  • the MME 42 transmits a handover response command 252 based on the SRVCC response to the command receiving unit 140 of the handover control apparatus 100 (step S214 in FIG. 2).
  • the handover control apparatus 100 executes the handover response unit 150 and transmits a handover instruction 152 for causing the mobile terminal 30 to perform handover (step S112 in FIG. 4).
  • the mobile terminal 30 executes a handover.
  • the mobile terminal 30 is handed over from the LTE network 10 to the 3G network 20 (see FIG. 1B), and is switched to a busy state by the 3G network 60 at time t10. That is, it indicates that SRVCC has been operated.
  • the following effects can be obtained.
  • the first embodiment based on the call state of the mobile terminal 30 and the mobile terminal information indicating whether or not the mobile terminal 30 can be handed over even when the call state of the mobile terminal 30 is in the ringing state. Since it is possible to determine whether or not handover is possible, call disconnection of the mobile terminal 30 due to handover of the mobile terminal 30 in a call state that the mobile terminal does not support, and the mobile terminal 30 and the IMS A state mismatch with the network 50 can be prevented.
  • the mobile terminal 30 has been described as an aSRVCC compatible terminal capable of performing a handover even when the call state is ringing. However, the mobile terminal 30 is similarly described for an aSRVCC non-compatible terminal. it can.
  • the aSRVCC incompatible terminal in the first modification corresponds to SRVCC defined in Release 9 of Non-Patent Document 3, but is defined in Release 10 and later of Non-Patent Documents 3 and 4.
  • aSRVCC indicates a non-compatible terminal.
  • the configuration of the first modification will be described by replacing “calling” at time t ⁇ b> 4 with “voice call in progress”.
  • the handover determination unit 240 determines that the handover is possible because the state of the voice call of the mobile terminal 30 is a busy state (FIG. 2). Step S208). After time t7, it is the same as in the first embodiment.
  • the call state of the mobile terminal 30 has been described as one of a calling state, a ringing state, an incoming call state, a call state, or an interrupt call state. An intermediate state or a cutting state may be included.
  • the handover determining unit 240 may determine that the handover is not possible when the call state of the mobile terminal 30 is a guidance state or a disconnection state before the call is established.
  • guidance sent before the call is established for example, out-of-service talk when the destination mobile terminal is out of service area
  • It includes both guidance that is sent out for example, the nuisance call guidance that is sent out when an incoming call from a nuisance call is rejected.
  • the guidance for the answering machine service includes, for example, both guidance sent before the call is established and guidance sent after the call is established. Note that the operation when the guidance is transmitted in a state after the call is established can start a normal SRVCC as in the case of a call. For this reason, in the first modification, the busy state after the call is established is included in the busy state. Further, the in-guidance state after the call is established is not included in the busy state, and the handover determination unit 240 may determine that the handover is impossible as in the in-guidance state before the call is established. .
  • the first modification is an example of a case where the mobile terminal 30 is a terminal that does not support aSRVCC, and the state of the call of the mobile terminal 30 is in a guidance state or a disconnection state before the call is established.
  • the state the operation that the handover determining unit 240 determines that the handover is impossible is described as an example, but other operations other than the operation that determines that the handover is impossible may be defined.
  • How to define the operation of the mobile terminal 30 when the call state of the mobile terminal 30 is in a guidance state or a disconnection state before the call is established depends on the capability of the mobile terminal 30. It depends on the network implementation.
  • the mobile terminal 30 is described as an aSRVCC compatible terminal capable of performing handover even when the call state is ringing.
  • the mobile terminal 30 Although described as a non-compatible terminal, a bSRVCC compatible terminal can be similarly described.
  • the mobile terminal 30 will be described as a bSRVCC compatible terminal capable of performing handover even when the call state is in a guidance state that is transmitted in a state before the call is established.
  • the terminal corresponding to bSRVCC in the second modification refers to a terminal compatible with the above-described SRVCC and aSRVCC and bSRVCC defined in Release 12 and later of Non-Patent Documents 3 and 4.
  • the mobile terminal 30 is a bSRVCC compatible terminal, the same processing as at time t0 in FIG. In the in-guidance state before the call is established, the in-calling state, and the talking state (including the in-guidance state after the call is established), the same processing as at time t4 in FIG. 5 is performed.
  • the operation in the guidance state before the call is established can be activated as bSRVCC
  • the operation in the ringing state can be activated as aSRVCC
  • the busy state (guidance after the call is established)
  • the operation in the middle state can be started as SRVCC.
  • the configuration of the second modification will be described by replacing “calling” at time t4 with “guidance before call is established”.
  • the handover determining unit 240 can perform handover because the voice call state of the mobile terminal 30 is in the guidance state before the call is established. (Step S208 in FIG. 2).
  • the operation after determining that the handover is possible can be started as bSRVCC. After time t7, it is the same as in the first embodiment.
  • a disconnecting state may be included as a call state of the mobile terminal 30.
  • the bSRVCC-compatible mobile terminal 30 described in the second modification does not support handover in a disconnected state. For this reason, the handover determination unit 240 may determine that the handover is not possible when the call state of the mobile terminal 30 is in the disconnecting state.
  • the second modification is an example in which the mobile terminal 30 is a bSRVCC compatible terminal. When the mobile terminal 30 is in a disconnected state, the handover determining unit 240 cannot perform a handover.
  • the operation for determining that the handover is performed is described as an example, but other operations other than the operation for determining that the handover is not possible may be defined. Other operations of the mobile terminal 30 when the call state of the mobile terminal 30 is in the disconnecting state are the same as in the first modification.
  • a handover determination device 2000 and a handover control device 1000 according to the second embodiment replace the handover determination device 200 and the handover control device 100 in FIG.
  • the handover control apparatus 1000 is configured by further including a handover request transmission restriction unit 170 in the handover control apparatus 100 of FIG.
  • the handover determination device 2000 is configured by replacing the command transmission unit 250 of the handover determination device 200 of FIG.
  • the handover determination device 2000 and the handover control device 1000 further include a handover suppression command 272 and a handover suppression release command 282.
  • FIG. 6 is a configuration diagram illustrating configurations of the handover determination device 2000 and the handover control device 1000 according to the second embodiment.
  • the base station device 40 includes a handover control apparatus 1000.
  • the IMS network 50 includes a handover determination device 2000.
  • the handover control apparatus 1000 includes a radio quality information reception unit 110, a radio quality determination unit 120, a handover request transmission unit 130, a command reception unit 140, a handover response unit 150, a handover rejection unit 160, and a handover request transmission restriction. Part 170.
  • the handover determination device 2000 includes a handover request reception unit 210, a call state acquisition unit 220, a mobile terminal information acquisition unit 230, a handover determination unit 240, and a command transmission unit 2500.
  • the command transmission unit 2500 transmits an SRVCC response for causing the handover control apparatus 1000 to perform the handover to the MME 42 via the MSC Server 44.
  • the MME 42 transmits a handover response command 252 based on the SRVCC response to the command receiving unit 140 of the handover control apparatus 1000.
  • the command transmission unit 2500 transmits an SRVCC rejection for preventing the handover control apparatus 1000 from performing the handover to the MME 42 via the MSC Server 44.
  • the MME 42 transmits a handover rejection command 262 based on the SRVCC rejection to the command reception unit 140 of the handover control apparatus 1000.
  • the command transmission unit 2500 transmits SRVCC suppression for the handover control apparatus 1000 to suppress transmission of the handover request 132 to the MME 42 via the MSC Server 44.
  • the MME 42 adds a handover suppression command 272 based on SRVCC suppression to the handover rejection command 262 and transmits it to the command receiving unit 140 of the handover control apparatus 1000.
  • the command transmission unit 2500 transmits the handover suppression command 272 to the handover control apparatus 1000
  • the command transmission unit 2500 waits until the determination of the handover determination unit 240 transitions to enable handover.
  • the handover control apparatus 1000 transmits to the MME 42 via the MSC Server 44 the SRVCC suppression release for canceling the suppression of transmission of the handover request.
  • the MME 42 transmits a handover suppression cancellation command 282 based on the SRVCC suppression cancellation to the command reception unit 140 of the handover control apparatus 1000.
  • the command reception unit 140 of the handover control apparatus 1000 includes a handover response command 252, a handover rejection command 262, a handover suppression command 272, a handover suppression release command 282, which are transmitted from the command transmission unit 2500 of the handover determination apparatus 2000. Receive.
  • the handover request transmission restriction unit 170 does not operate the handover request transmission unit 130 when the command received by the command reception unit 140 includes the handover suppression command 272. Further, when the command received by the command receiving unit 140 includes the handover suppression release command 282, the handover request transmission limiting unit 170 operates the handover request transmitting unit 130.
  • FIG. 7 is a flowchart showing the operation of the handover determination device 2000 according to the second embodiment.
  • the mobile terminal 30 which is an aSRVCC compatible terminal capable of handover even when the SRVCC and the call state are ringing acquires a voice call (performs a voice call), and the voice call state and the mobile terminal A case where it is determined whether or not handover is possible based on the machine information will be described. As shown in FIG.
  • step S2002 the handover request receiving unit 210 waits until it receives an SRVCC request based on the handover request 132 transmitted from the handover request transmitting unit 130, and the SRVCC request based on the handover request 132 is received. Is received, the process proceeds to step S2004.
  • step S2004 the mobile terminal information acquisition unit 230 displays the mobile terminal information indicating whether or not the mobile terminal 30 is an aSRVCC compatible terminal capable of performing handover even when the voice call state is ringing. Obtained from the machine information management device 80. Thereafter, the process proceeds to step S2006. If the mobile terminal information acquisition unit 230 has already acquired the mobile terminal information of the mobile terminal 30 from the mobile terminal information management device 80, the process of step S2004 may not be performed.
  • step S2006 the call state acquisition unit 220 is in a state where the voice call of the mobile terminal 30 is in a calling state, a ringing state, an incoming state, a call state, or an interrupt call state. Is obtained from the call control device 70 that monitors the state of the voice call of the mobile terminal 30. Thereafter, the process proceeds to step S2008.
  • step S2008 the handover determination unit 240 is executed. Thereafter, the process proceeds to step S2010.
  • step S2010 if the handover determining unit 240 determines that a handover is possible, the process proceeds to step S2012.
  • step S2014 when the handover determination unit 240 determines that the handover is not possible in step S2010, the process proceeds to step S2014.
  • step S2012 by executing the command transmission unit 2500, an SRVCC response is transmitted to the MME 42 via the MSC Server 44.
  • the MME 42 transmits a handover response command 252 based on the SRVCC response to the command receiving unit 140 of the handover control apparatus 1000. Thereafter, the process proceeds to step S2002.
  • step S2014 by executing the command transmission unit 2500, the SRVCC rejection is transmitted to the MME 42 via the MSC Server 44.
  • the MME 42 transmits a handover rejection command 262 based on the SRVCC rejection to the command reception unit 140 of the handover control apparatus 1000.
  • step S2016 the command transmission unit 2500 is executed to transmit the SRVCC suppression to the MME 42 via the MSC Server 44.
  • the MME 42 transmits a handover suppression command 272 based on SRVCC suppression to the command reception unit 140 of the handover control apparatus 1000.
  • step S2018 the process proceeds to step S2018.
  • step S ⁇ b> 2018 the call state acquisition unit 220 has a voice call state of the mobile terminal 30 in any of a calling state, a ringing state, a receiving state, a calling state, or an interrupting call state. Is obtained from the call control device 70 that monitors the state of the voice call of the mobile terminal 30. Thereafter, the process proceeds to step S2020. In step S2020, the handover determination unit 240 is executed. Thereafter, the process proceeds to step S2022.
  • step S2022 when the handover determining unit 240 determines that a handover is possible, the process proceeds to step S2024. On the other hand, when the handover determination unit 240 determines that the handover is not possible in step S2022, the process proceeds to step S2018.
  • step S2024 by executing the command transmission unit 2500, the SRVCC suppression release is transmitted to the MME 42 via the MSC Server 44. The MME 42 transmits a handover suppression cancellation command 282 based on the SRVCC suppression cancellation to the command reception unit 140 of the handover control apparatus 1000. Thereafter, the process proceeds to step S2002.
  • FIG. 8 is a flowchart showing the operation of the handover control apparatus 1000 according to the second embodiment.
  • the process waits until the wireless quality information receiving unit 110 receives the wireless quality information 32. If received, the process proceeds to step S1004.
  • the radio quality determination unit 120 determines whether the radio quality of the mobile terminal 30 is deteriorated based on the radio quality information 32. If the radio quality is deteriorated, the process proceeds to step S1006. . On the other hand, if the wireless quality is not degraded in step S1004, the process proceeds to step S1002.
  • step S1006 the handover request transmitter 130 transmits a handover request 132 to the MME 42.
  • the MME 42 transmits the SRVCC request to the handover request receiving unit 210 via the MSC Server 44.
  • step S1008 the process waits until the command receiving unit 140 receives a command.
  • step S1010 it is determined whether the command received by the command receiver 140 is a handover response command 252. If the command is a handover response command 252, the process proceeds to step S1012. On the other hand, if it is not the handover response command 252 in step S1010, the process proceeds to step S1014.
  • step S1012 the handover response unit 150 is executed, and a handover instruction 152 is transmitted to the mobile terminal 30. Thereafter, the process proceeds to step S1002.
  • step S1014 it is determined whether or not the command received by the command receiving unit 140 is a handover suppression command 272. If the command is the handover suppression command 272, the process proceeds to step S1008 (that is, the handover request transmitting unit 130 is operated). Don't let me) On the other hand, if it is not the handover inhibition command 272 in step S1014, the process proceeds to step S1016.
  • step S1016 it is determined whether or not the command received by the command receiver 140 is a handover suppression release command 282. If the command is a handover suppression release command 282, the process proceeds to step S1002 (that is, the handover request transmitter 130). To work). On the other hand, in step S1016, if it is not the handover suppression release command 282 (that is, the handover rejection command 262), the process proceeds to step S1018. Meanwhile, in step S1018, the handover rejection unit 160 is executed, and the handover instruction 152 for causing the mobile terminal 30 to perform the handover is not transmitted. Thereafter, the process proceeds to step S1002. Note that the operations in steps S1014 and S1016 are operations of the handover request transmission restriction unit 170.
  • FIG. 9 is a sequence diagram illustrating operations of the handover determination device 2000 and the handover control device 1000 according to the second embodiment.
  • the mobile terminal 30 is an aSRVCC compatible mobile terminal capable of performing handover even when the call state is ringing, and is assumed to be in the vicinity of the service area boundary of the LTE network 10 and within the service area of the 3G network 20 ( 1 (B)), it demonstrates as what is communicating with the base station apparatus 40 of the LTE network 10.
  • FIG. 9 the mobile terminal 30 is in a state (before transmission) before a bearer for a voice call is established at time t0.
  • the mobile terminal 30 acquires a voice call (performs a voice call) and determines whether or not handover is possible based on the voice call state and the mobile terminal information.
  • a call for making a voice call with the partner mobile terminal is started. It is assumed that a user having a mobile terminal 30 moves from the LTE network 10 to the vicinity of the service area of the 3G network 20 (see FIG. 1B) while starting transmission. Since the mobile terminal 30 has moved to the vicinity of the end of the LTE network 10, the radio quality from the LTE network 10 deteriorates. Therefore, the mobile terminal 30 transmits to the base station device 40 the wireless quality information 32 indicating that the current wireless quality has fallen below the threshold value of the wireless quality specified by the base station device 40 at time t1.
  • the radio quality information receiving unit 110 of the handover control apparatus 1000 included in the base station device 40 receives the radio quality information 32 (step S1002 in FIG. 8).
  • the wireless quality determination unit 120 determines that the wireless quality of the mobile terminal 30 has deteriorated based on the wireless quality information 32 (step S1004 in FIG. 8).
  • the handover request transmission unit 130 transmits a handover request 132 to the MME 42.
  • the MME 42 transmits the SRVCC request to the handover request receiving unit 210 via the MSC Server 44 (Step S1006 in FIG. 8).
  • the handover request receiving unit 210 receives the SRVCC request based on the handover request 132 (step S2002 in FIG. 7).
  • the mobile terminal information acquisition unit 230 stores mobile terminal information indicating whether or not the mobile terminal 30 is an aSRVCC compatible terminal that can be handed over even when the voice call is ringing. 80 (step S2004 in FIG. 7).
  • the call state acquisition unit 220 acquires that the voice call state of the mobile terminal 30 is a calling state (step S2006 in FIG. 7).
  • the handover determination unit 240 determines that the handover is not possible because the voice call state of the mobile terminal 30 is a calling state (step S2008 in FIG. 7).
  • the SRVCC rejection is transmitted to the MME 42 via the MSC Server 44 by executing the command transmission unit 2500.
  • the MME 42 transmits a handover rejection command 262 based on the SRVCC rejection to the command receiving unit 140 of the handover control apparatus 1000 (step S2014 in FIG. 7).
  • the SRVCC suppression is transmitted to the MME 42 via the MSC Server 44.
  • the MME 42 transmits a handover suppression command 272 based on SRVCC suppression to the command receiving unit 140 of the handover control apparatus 1000 (step S2016 in FIG. 7).
  • the handover determination device 2000 transmits a handover suppression command 272 via SRVCC suppression, then monitors the voice call state of the mobile terminal 30 by the call state acquisition unit 220 and waits until the handover determination unit 240 determines that the handover is possible. (Steps S2018 to S2022 in FIG. 7).
  • the handover control apparatus 1000 Since the handover control apparatus 1000 has received the handover suppression command 272 (step S1014 in FIG. 8), the handover control apparatus 1000 waits until it receives a command (handover suppression cancellation command 282) from the handover determination apparatus 2000 (step S1008 in FIG. 8). Next, at time t ⁇ b> 4, the mobile terminal 30 transmits to the base station device 40 the wireless quality information 32 indicating that the current wireless quality is below the wireless quality threshold specified by the base station device 40. However, since the handover request transmission unit 130 does not operate until the handover control apparatus 1000 receives a command (handover suppression release command 282) from the handover determination apparatus 2000, transmission of the handover request 132 is suppressed.
  • the state of the voice call of the mobile terminal 30 changes to the ringing state.
  • the handover determination device 2000 determines that the handover determination unit 240 can perform the handover because the voice call state of the mobile terminal 30 has changed to the ringing state (step S2022 in FIG. 7).
  • the handover determination device 2000 transmits SRVCC suppression release to the MME 42 via the MSC Server 44.
  • the MME 42 transmits a handover suppression cancellation command 282 based on the SRVCC suppression cancellation to the command reception unit 140 of the handover control apparatus 1000 (step S2024 in FIG. 7). Since the handover control apparatus 1000 receives the handover suppression release command 282 (step S1016 in FIG. 8), the handover request transmission unit 130 starts operating, and the suppression of transmission of the handover request 132 is released.
  • the mobile terminal 30 transmits to the base station device 40 the wireless quality information 32 indicating that the current wireless quality is below the wireless quality threshold specified by the base station device 40.
  • the radio quality information receiving unit 110 of the handover control apparatus 1000 receives the radio quality information 32 (step S1002 in FIG. 8).
  • the wireless quality determination unit 120 determines that the wireless quality of the mobile terminal 30 has deteriorated based on the wireless quality information 32 (step S1004 in FIG. 8).
  • the handover request transmitter 130 transmits a handover request 132 to the MME 42.
  • the MME 42 transmits the SRVCC request to the handover request receiving unit 210 via the MSC Server 44 (Step S1006 in FIG. 8).
  • the handover request receiving unit 210 receives an SRVCC request based on the handover request 132 (step S2002 in FIG. 7).
  • the call state acquisition unit 220 acquires that the voice call state of the mobile terminal 30 is a ringing state (step S2006 in FIG. 7).
  • the handover determination unit 240 determines that the handover is possible because the voice call state of the mobile terminal 30 is in the ringing state and the mobile terminal information of the mobile terminal 30 is an aSRVCC compatible terminal (step S2008 in FIG. 7). ).
  • the SRVCC response is transmitted to the MME 42 via the MSC Server 44.
  • the MME 42 transmits a handover response command 252 based on the SRVCC response to the command receiving unit 140 of the handover control apparatus 1000 (step S2012 in FIG. 7).
  • the handover control apparatus 100 executes the handover response unit 150 and transmits a handover instruction 152 for causing the mobile terminal 30 to perform handover (step S1012 in FIG. 8).
  • the mobile terminal 30 executes a handover.
  • the mobile terminal 30 has been handed over from the LTE network 10 to the 3G network 20 (see FIG. 1B), and has switched to a busy state by the 3G network 60 at time t12. That is, it indicates that SRVCC has been operated.
  • the mobile terminal information can be handed over with the call state of the mobile terminal, the mobile terminal information indicating whether or not the mobile terminal can be handed over even when the call state of the mobile terminal is ringing. It is possible to control handover based on a command from a handover determination device that determines whether or not, and during a period when handover is not possible, transmission of a handover request can be suppressed based on a command from the handover determination device.
  • the mobile terminal 30 is described as an aSRVCC compatible terminal capable of performing handover even when the call state is ringing. However, the mobile terminal 30 is similarly described for an aSRVCC non-compatible terminal. it can. Note that a terminal that does not support aSRVCC in the third modification indicates a terminal that supports SRVCC but does not support aSRVCC, as in the first modification.
  • the mobile terminal 30 is a terminal that does not support aSRVCC, the same processing as that at time t0 in FIG. 9 is performed in the calling state and the calling state. In a busy state (including a busy state after the call is established), the same processing as at time t5 in FIG. 9 is performed.
  • the configuration of the third modification will be described by replacing “calling” at time t5 with “voice call in progress”.
  • the handover determining unit 240 determines that the handover is possible because the state of the voice call of the mobile terminal 30 is a busy state (FIG. 7).
  • Step S2008 the process is the same as in the second embodiment.
  • the state of the voice call of the mobile terminal 30 has been described as one of a calling state, a ringing state, an incoming call state, a call state, or an interrupt call state, but this has led to a voice guidance. A state during guidance or a state during disconnection may be included.
  • the handover determining unit 240 may determine that the handover is not possible when the call state of the mobile terminal 30 is a guidance state or a disconnection state before the call is established.
  • other operations than the operation in which the handover determining unit 240 determines that the handover is impossible may be defined.
  • the mobile terminal 30 is described as an aSRVCC compatible terminal capable of performing handover even when the call state is ringing.
  • the mobile terminal 30 Although described as a non-compatible terminal, a bSRVCC compatible terminal can be similarly described.
  • the mobile terminal 30 will be described as a bSRVCC compatible terminal capable of performing handover even when the call state is in a guidance state that is transmitted in a state before the call is established.
  • the terminal corresponding to bSRVCC in Modification 4 refers to a terminal compatible with SRVCC, aSRVCC, and bSRVCC.
  • the mobile terminal 30 is a bSRVCC compatible terminal, the same processing as at time t0 in FIG. In the in-guidance state before the call is established, the in-calling state, and the in-call state (including the in-guidance state after the call is established), processing similar to that at time t5 in FIG. 9 is performed.
  • the operation in the guidance state before the call is established can be activated as bSRVCC
  • the operation in the ringing state can be activated as aSRVCC
  • the busy state (guidance after the call is established)
  • the operation in the middle state can be started as SRVCC.
  • the configuration of Modification 4 will be described by replacing “calling” at time t ⁇ b> 5 with “guidance before the call is established”.
  • the handover determination unit 240 can perform handover because the voice call state of the mobile terminal 30 is in the guidance state before the call is established. (Step S2008 in FIG. 7). After time t8, the process is the same as in the second embodiment.
  • the handover determination apparatus described above employs the following handover determination method. In other words, a request for handing over a mobile terminal capable of voice or video call between the first network communication network and the second network communication network having a common service area with the first network communication network is handed over.
  • a handover determination method received from a control device comprising: detecting a deterioration in radio quality of the mobile terminal during a voice call or video call in the first network communication network; A handover request receiving step of receiving a handover request or a request based on the handover request for handover from the first network communication network to the second network communication network to continue the call, and the handover request
  • the reception process is the handover request
  • a call state acquisition step of acquiring a call state of the mobile terminal, and the mobile terminal is a mobile terminal capable of the handover in the call state.
  • a mobile terminal information acquisition step for acquiring mobile terminal information including information on whether or not there is, a call state acquired by the call state acquisition step, and the mobile terminal acquired by the mobile terminal information acquisition step Based on the information, if the mobile terminal is not capable of the handover in the call state, it is determined that the handover is not possible. If the mobile terminal is capable of the handover in the call state, the handover is possible.
  • the handover control apparatus A command transmission step for transmitting a handover response command for causing the handover control device to execute the handover when the handover determination step determines that handover is possible, Including handover determination method is adopted.
  • a handover suppression command for causing the handover control apparatus to suppress transmission of the handover request is sent to the handover determination method.
  • the handover suppression release command may be transmitted.
  • the handover control apparatus described above employs the following handover control method.
  • a request for handing over a mobile terminal capable of voice or video call between the first network communication network and the second network communication network having a common service area with the first network communication network is handed over.
  • a handover control method for transmitting to a determination device comprising: a radio quality information receiving step for receiving radio quality information transmitted by the mobile terminal residing in the first network communication network; and the radio quality information
  • a wireless quality determination step for determining whether or not the wireless quality of the mobile terminal in the first network communication network is deteriorated, and the wireless quality determination step determines that the wireless quality of the mobile terminal has deteriorated
  • the mobile terminal is handed over from the first network communication network to the second network communication network.
  • a handover reject step that does not transmit the handover instruction to the mobile terminal, and the command reception step includes the handover request
  • the handover request transmission step is not operated, and when the command reception step receives a handover suppression cancellation command for canceling suppression of transmission of the handover request
  • a handover control method including a handover request transmission restriction step for operating the handover request transmission step is employed.
  • ⁇ Handover determination program> when implementing the above-described handover determination device by executing a program in the IMS network, the following program can be used.
  • a request for handing over a mobile terminal capable of voice or video call between the first network communication network and the second network communication network having a common service area with the first network communication network is handed over.
  • a handover request receiving step for receiving a handover request or a request based on the handover request for continuing a call by handing over a network from the first network communication network to the second network communication network; Receiving the handover request
  • a call state acquisition step of acquiring a call state of the mobile terminal, and the mobile terminal can perform the handover in the call state
  • a mobile terminal information acquisition step for acquiring mobile terminal information including information as to whether or not the terminal is a mobile terminal, the call state acquired by the call state acquisition step, and the mobile terminal information acquisition step Based on the mobile terminal information, if the mobile terminal is not capable of handover in the call state, it is determined that handover is not possible, and if the mobile terminal is capable of handover in the call state
  • a handover determination step for determining that a handover is possible, and the handover determination step includes a handover If it is determined that the handover is possible, a handover rejection command for not causing the handover controller to perform the
  • a handover suppression command for causing the handover control device to suppress transmission of the handover request is added to the handover rejection command.
  • a handover suppression release command for causing the handover control device to cancel suppression of transmission of the handover request. You may make it transmit.
  • ⁇ Handover control program> when the above-described handover control apparatus is realized by executing a program in a base station device, the following program can be used. In other words, a request for handing over a mobile terminal capable of voice or video call between the first network communication network and the second network communication network having a common service area with the first network communication network is handed over.
  • a handover control program to be transmitted to a determination device comprising: a radio quality information receiving step for receiving, on a computer, radio quality information transmitted by the mobile terminal located in the first network communication network; A radio quality determination step for determining whether or not the radio quality of the mobile terminal in the first network communication network is deteriorated based on quality information, and the radio quality determination step is a deterioration of the radio quality of the mobile terminal If it is determined that the mobile terminal is not connected to the second network from the first network communication network.
  • a handover request transmission step for transmitting a handover request for continuing a call by handing over to a network communication network to the handover determination device; and a response from the handover determination device to the handover request transmitted by the handover request transmission step.
  • the command receiving step receives a handover rejection command for preventing the handover from being performed, a handover request that does not transmit the handover instruction to the mobile terminal is received.
  • the handover rejection command for suppressing the transmission of the handover request is received by the command rejection step and the command reception step, the handover request transmission step is not operated, and the command reception step suppresses the transmission of the handover request.
  • a handover control program for executing a handover request transmission restriction step for operating the handover request transmission step when a handover suppression release command for canceling is received can be used.
  • the present invention prevents call disconnection of a mobile terminal due to handover of the mobile terminal when the call state does not comply with the SRVCC specification and state mismatch between the mobile terminal and the IMS network. In addition, it can be used when unnecessary traffic between the base station device and the IMS network is reduced by suppressing transmission of unnecessary handover requests.

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Abstract

Provided are a handover determination device and a handover control device which prevent a state mismatch, a call disconnection, and the like between user equipment and an IMS network due to the execution of handover in the state in which SRVCC is not supported. User equipment (30) capable of making a telephone conversation by a voice conversation or a video conversation via a network communication network (10) and a network communication network (20) includes: a handover request reception unit (210) which receives a handover request (132) that requests the handover of the telephone conversation from the network communication network (10) to the network communication network (20); a call state acquisition unit (220) which detects a call state of the user equipment (30); and a command transmission unit (250) which transmits, to a handover control device (100), a handover rejection command (262) for the handover control device (100) to cause the user equipment (30) not to execute the handover except when the call state is during a telephone conversation.

Description

ハンドオーバ判定装置、ハンドオーバ制御装置、ハンドオーバ判定方法、ハンドオーバ制御方法、ハンドオーバ判定プログラム、ハンドオーバ制御プログラムHandover determination device, handover control device, handover determination method, handover control method, handover determination program, handover control program
　本発明は、通話中の移動端末機が異なるネットワーク通信網間を移動する際に発生するハンドオーバを制御するハンドオーバ判定装置、ハンドオーバ制御装置、ハンドオーバ判定方法、ハンドオーバ制御方法、ハンドオーバ判定プログラム、ハンドオーバ制御プログラムに関する。 The present invention relates to a handover determination device, a handover control device, a handover determination method, a handover control method, a handover determination program, and a handover control program for controlling a handover that occurs when mobile terminals in a call move between different network communication networks. About.
　ＩＭＳ（IP Multimedia Subsystem）を構成するＳ－ＣＳＣＦ（Serving Call Session Control Function）やＰ－ＣＳＣＦ（Proxy Call Session Control Function）などのＩＭＳ系装置は、移動端末機の在圏状態に依存せずに呼制御を行うための装置である。ＩＭＳによる着信手順（例えば、音声呼の着信など）については、非特許文献１に規定されている。
　移動端末機のアクセス網として、ＬＴＥ（Long Term Evolution）網と３Ｇ（3rd Generation、第３世代移動通信システム）網とを収容している場合がある。現在、ＬＴＥ網は、対応する基地局などの通信設備を順次設置している段階である。また、既に多くの通信設備が設置されている３Ｇ網に比べて、ＬＴＥ網は通信可能なサービスエリアが狭いことが多い。このため、ＬＴＥ網に在圏して音声通話をしている移動端末機が３Ｇ網のサービスエリアに移動した場合に、ＶｏＬＴＥ（Voice over LTE）方式のＬＴＥ網から回線交換方式の３Ｇ網にハンドオーバ（ＨＯ：Hand Over）させて音声通話を継続させるための方式としてＳＲＶＣＣ（Single Radio Voice Call Continuity）という技術がある。このＳＲＶＣＣは、非特許文献２，３に規定されている。 IMS devices such as S-CSCF (Serving Call Session Control Function) and P-CSCF (Proxy Call Session Control Function) that constitute IMS (IP Multimedia Subsystem) call without depending on the mobile terminal's location status. It is an apparatus for performing control. Non-Patent Document 1 defines an incoming call procedure by IMS (for example, incoming voice call).
There are cases where an LTE (Long Term Evolution) network and a 3G (3rd Generation, third generation mobile communication system) network are accommodated as access networks for mobile terminals. Currently, the LTE network is in a stage where communication facilities such as corresponding base stations are sequentially installed. In addition, the LTE network often has a narrower service area than the 3G network in which many communication facilities are already installed. For this reason, when a mobile terminal located in the LTE network and making a voice call moves to the service area of the 3G network, the handover from the VoLTE (Voice over LTE) LTE network to the circuit switched 3G network is performed. There is a technology called SRVCC (Single Radio Voice Call Continuity) as a method for continuing a voice call by (HO: Hand Over). This SRVCC is defined in Non-Patent Documents 2 and 3.
　ＳＲＶＣＣに関する標準化の資料である非特許文献３（特にリリース９）には、ＳＲＶＣＣは、移動端末機の音声呼の状態が音声通話中に限られた動作であり、音声通話中になるまでの発信中、着信中、ガイダンス中や呼び出し中におけるＳＲＶＣＣの動作については規定がされていない。移動端末機の音声呼の状態が呼び出し中状態である場合のＳＲＶＣＣであるａＳＲＶＣＣ（alerting ＳＲＶＣＣ）に関しては、非特許文献３および４のリリース１０以降で規定されている。しかしながら、移動端末機がａＳＲＶＣＣを利用するには、移動端末機がａＳＲＶＣＣに対応している必要がある。従って、ａＳＲＶＣＣの機能が導入されたとしても、ａＳＲＶＣＣに対応している移動端末機と対応していない移動端末機とが混在することが想定される。また、移動端末機の音声呼の状態が呼が確立される前の状態で送出されるガイダンスのガイダンス中状態である場合のＳＲＶＣＣであるｂＳＲＶＣＣ（ＳＲＶＣＣ before ringing）に関しては、非特許文献３および４のリリース１２以降で規定されている。なお、移動端末機の音声呼の状態が呼が確立された後の状態で送出されるガイダンスのガイダンス中状態である場合には、音声通話中と同様にＳＲＶＣＣの動作となる。 According to Non-Patent Document 3 (especially Release 9), which is a standardization material related to SRVCC, SRVCC is an operation in which the state of a voice call of a mobile terminal is limited during a voice call, and transmission until a voice call is in progress. There is no provision for the operation of SRVCC during middle, incoming call, guidance or ringing. The aSRVCC (alerting４SRVCC), which is the SRVCC when the voice call state of the mobile terminal is in the ringing state, is specified in Releases 10 and later of Non-Patent Documents 3 and 4. However, in order for a mobile terminal to use aSRVCC, the mobile terminal needs to support aSRVCC. Therefore, even if the aSRVCC function is introduced, it is assumed that mobile terminals that are compatible with aSRVCC and mobile terminals that are not compatible are mixed. Further, regarding bSRVCC (SRVCC before ringing) which is an SRVCC when the voice call state of the mobile terminal is a guidance in-progress state transmitted before the call is established, Non-Patent Documents 3 and 4 Stipulated in Release 12 and later. When the voice call state of the mobile terminal is a guidance in-progress state transmitted after the call is established, the SRVCC operation is performed as in the case of a voice call.
　ここで、非特許文献３（特にリリース９）に規定されたＳＲＶＣＣの動作について、図１１を参照しながら説明する。図１１（Ａ）は、発信中状態での従来のＳＲＶＣＣの動作を示すシーケンス図であり、図１１（Ｂ）は、ＬＴＥ網と３Ｇ網のサービスエリアの関係を示す概略図である。
　図１１（Ｂ）に示すように、移動端末機（ＵＥ：User Equipment）３０は、ＬＴＥ網１０の基地局機器（ｅＮＢ：eNodeB）４０と通信しており、ＬＴＥ網１０のサービスエリアの境界付近かつ３Ｇ網２０のサービスエリアの中にいるものとする。図１１（Ａ）に示すように、ＩＭＳネットワーク（ＩＭＳ　ＮＷ）５０に含まれるＳ－ＣＳＣＦやＰ－ＣＳＣＦなどの呼制御装置７０は、移動端末機３０の呼制御を行っている。図１１（Ａ）では、移動端末機３０は、音声通話のためのベアラ（bearer）が確立される前の状態（発信前）とする。 Here, the operation of SRVCC defined in Non-Patent Document 3 (particularly Release 9) will be described with reference to FIG. FIG. 11A is a sequence diagram showing the operation of the conventional SRVCC in the outgoing call state, and FIG. 11B is a schematic diagram showing the relationship between the service areas of the LTE network and the 3G network.
As shown in FIG. 11B, a mobile terminal (UE: User Equipment) 30 communicates with a base station equipment (eNB: eNodeB) 40 of the LTE network 10 and is near the boundary of the service area of the LTE network 10. It is assumed that the user is in the service area of the 3G network 20. As shown in FIG. 11A, a call control device 70 such as S-CSCF or P-CSCF included in an IMS network (IMS NW) 50 performs call control of the mobile terminal 30. In FIG. 11A, the mobile terminal 30 is in a state (before transmission) before a bearer for voice call is established.
　移動端末機３０を用いてユーザが発信操作をすることにより、相手側移動端末機と音声通話をするための発信が開始される。発信を開始するとともに、移動端末機３０を伴って発信側ユーザがＬＴＥ網１０のサービスエリアの境界付近からエリア端側へ移動したとする。移動端末機３０は、ＬＴＥ網１０のエリア端付近に移動したため、ＬＴＥ網１０からの無線品質が劣化してくる。そのため、時点ｔ１で、移動端末機３０は、現在の無線品質が基地局機器４０から指定された無線品質の閾値を下回ったことを示す無線品質情報３２を基地局機器４０に送信する。 When a user performs a call operation using the mobile terminal 30, a call for making a voice call with the partner mobile terminal is started. It is assumed that the transmission side user starts from the vicinity of the boundary of the service area of the LTE network 10 and moves to the end of the area along with the mobile terminal 30 while starting the transmission. Since the mobile terminal 30 has moved near the end of the area of the LTE network 10, the radio quality from the LTE network 10 deteriorates. Therefore, the mobile terminal 30 transmits to the base station device 40 the wireless quality information 32 indicating that the current wireless quality has fallen below the threshold value of the wireless quality specified by the base station device 40 at time t1.
　基地局機器４０は、無線品質情報３２に基づき、移動端末機３０の音声通話をＬＴＥ網１０から３Ｇ網２０にハンドオーバさせて通話を継続させることを判断する。時点ｔ２で、基地局機器４０は、移動端末機３０をＬＴＥ網１０から３Ｇ網２０にハンドオーバさせるハンドオーバ要求１３２をＭＭＥ（Mobile Management Entity）４２に送信する。ＭＭＥ４２は、ＭＳＣ（Multimedia Switching Center）　Ｓｅｒｖｅｒ４４経由でＳＲＶＣＣ要求をＩＭＳネットワーク５０に送信する。時点ｔ３で、ＩＭＳネットワーク５０は、移動端末機３０の音声呼の状態が発信中状態であるにも関わらず、移動端末機３０をＬＴＥ網１０から３Ｇ網２０にＳＲＶＣＣさせるＳＲＶＣＣ応答をＭＳＣ　Ｓｅｒｖｅｒ４４経由でＭＭＥ４２に送信し、ＭＭＥ４２はハンドオーバ応答コマンド２５２を基地局機器４０に送信する。基地局機器４０は、ハンドオーバ応答コマンド２５２を受信したので、時点ｔ４で、移動端末機３０にハンドオーバ指示１５２を送信する。時点ｔ５で、移動端末機３０は、ハンドオーバを実行する。 Based on the wireless quality information 32, the base station device 40 determines that the voice call of the mobile terminal 30 is handed over from the LTE network 10 to the 3G network 20 to continue the call. At time t2, the base station device 40 transmits a handover request 132 for handing over the mobile terminal 30 from the LTE network 10 to the 3G network 20 to an MME (Mobile Management Entity) 42. The MME 42 transmits an SRVCC request to the IMS network 50 via an MSC (Multimedia Switching Center) Server 44. At time t3, the IMS network 50 sends an SRVCC response via the MSC Server 44 that causes the mobile terminal 30 to SRVCC from the LTE network 10 to the 3G network 20 even though the voice call state of the mobile terminal 30 is in the outgoing state. To the MME 42, and the MME 42 transmits a handover response command 252 to the base station device 40. Since the base station device 40 has received the handover response command 252, the base station device 40 transmits a handover instruction 152 to the mobile terminal 30 at time t 4. At time t5, the mobile terminal 30 executes a handover.
　しかしながら、時点ｔ５で、移動端末機３０は、音声呼の状態がまだ発信中状態であり、通話中状態ではない。
通話中状態ではない場合のＳＲＶＣＣの動作は、非特許文献３（特にリリース９）に規定されていない。このため、ＩＭＳネットワーク５０は、３Ｇ　ＮＷ６０へのＳＲＶＣＣを正しく行うことができない。また、移動端末機３０は、ＩＭＳネットワーク５０で使用していたＳＩＰプロトコルから３Ｇ　ＮＷ６０で使用すべきＣＣプロトコルへの音声プロトコルの変換ができない状態となり、呼切断に繋がる可能性や、移動端末機３０とＩＭＳネットワーク５０との間で、状態が不一致になってしまう可能性がある。 However, at time t5, the mobile terminal 30 is still in a calling state and not in a calling state.
The operation of SRVCC when not in a call state is not defined in Non-Patent Document 3 (particularly Release 9). For this reason, the IMS network 50 cannot correctly perform SRVCC to the 3G NW 60. In addition, the mobile terminal 30 is in a state where the voice protocol cannot be converted from the SIP protocol used in the IMS network 50 to the CC protocol to be used in the 3G NW 60, which may lead to call disconnection, And the IMS network 50 may become inconsistent.
　本発明は、上述した従来技術の問題点を解決するためになされたものであり、その目的は、音声呼の状態がＳＲＶＣＣの規定に対応していない場合に移動端末機をハンドオーバさせてしまうことによる移動端末機の呼切断や、移動端末機とＩＭＳネットワークとの間の状態不一致を防ぐことができ、さらに不要なハンドオーバ要求の送信を抑止させることにより、基地局機器とＩＭＳネットワークとの間の無駄なトラヒックを削減することができるハンドオーバ判定装置、ハンドオーバ制御装置、ハンドオーバ判定方法、ハンドオーバ制御方法、ハンドオーバ判定プログラム、ハンドオーバ制御プログラムを提供することである。 The present invention has been made to solve the above-described problems of the prior art, and its purpose is to hand over a mobile terminal when a voice call state does not comply with the SRVCC regulations. Can prevent call disconnection of the mobile terminal and state mismatch between the mobile terminal and the IMS network, and further suppress transmission of unnecessary handover requests, thereby preventing the base station device and the IMS network from transmitting. It is to provide a handover determination device, a handover control device, a handover determination method, a handover control method, a handover determination program, and a handover control program that can reduce useless traffic.
　本発明のある態様によるハンドオーバ判定装置は、第１のネットワーク通信網と前記第１のネットワーク通信網と共通のサービスエリアを有する第２のネットワーク通信網とで音声通話またはビデオ通話による通話が可能な移動端末機をハンドオーバさせる要求をハンドオーバ制御装置から受信するハンドオーバ判定装置であって、前記第１のネットワーク通信網で音声通話またはビデオ通話による通話中に前記移動端末機の無線品質の劣化を検出した場合に、前記移動端末機を前記第１のネットワーク通信網から前記第２のネットワーク通信網にハンドオーバさせて通話を継続させるためのハンドオーバ要求または前記ハンドオーバ要求に基づく要求を前記ハンドオーバ制御装置から受信するハンドオーバ要求受信部と、前記ハンドオーバ要求受信部が前記ハンドオーバ要求または前記ハンドオーバ要求に基づく要求を受信した場合、前記移動端末機の呼の状態を取得する呼状態取得部と、前記移動端末機が、前記呼の状態において前記ハンドオーバが可能な移動端末機であるか否かの情報を含む移動端末機情報を取得する移動端末機情報取得部と、前記呼状態取得部が取得した前記呼の状態と前記移動端末機情報取得部が取得した前記移動端末機情報とに基づき、前記呼の状態において前記ハンドオーバが可能な移動端末機ではない場合は、ハンドオーバ不可と判定し、前記呼の状態において前記ハンドオーバが可能な移動端末機である場合は、ハンドオーバ可能と判定するハンドオーバ判定部と、前記ハンドオーバ判定部がハンドオーバ不可と判定した場合は、前記ハンドオーバ制御装置に前記ハンドオーバを実施させないためのハンドオーバ拒否コマンドを送信し、前記ハンドオーバ判定部がハンドオーバ可能と判定した場合は、前記ハンドオーバ制御装置に前記ハンドオーバを実施させるためのハンドオーバ応答コマンドを送信するコマンド送信部と、を備えることを特徴とする。 A handover determination apparatus according to an aspect of the present invention is capable of making a voice call or a video call between a first network communication network and a second network communication network having a common service area with the first network communication network. A handover determination apparatus that receives a request for handover of a mobile terminal from a handover control apparatus, wherein a degradation in radio quality of the mobile terminal is detected during a voice call or a video call in the first network communication network In this case, a handover request for handing over the mobile terminal from the first network communication network to the second network communication network and continuing a call or a request based on the handover request is received from the handover control apparatus. A handover request receiving unit; When the request reception unit receives the handover request or the request based on the handover request, the call state acquisition unit that acquires the call state of the mobile terminal, and the mobile terminal performs the handover in the call state. A mobile terminal information acquisition unit that acquires mobile terminal information including information on whether or not the mobile terminal is a possible mobile terminal, the call state acquired by the call state acquisition unit, and the mobile terminal information acquisition unit Based on the acquired mobile terminal information, if the mobile terminal is not capable of handover in the call state, it is determined that handover is not possible, and the mobile terminal is capable of handover in the call state. A handover determining unit that determines that a handover is possible, and the handover determining unit that determines that a handover is not possible, A handover rejection command for preventing the handover control apparatus from performing the handover, and when the handover determining unit determines that the handover is possible, transmits a handover response command for causing the handover control apparatus to perform the handover And a command transmission unit.
　この構成によれば、移動端末機の呼の状態と、移動端末機の呼の状態においてハンドオーバが可能な移動端末機であるか否かの移動端末機情報とに基づき、ハンドオーバができるか否かを判定できるので、呼の状態がＳＲＶＣＣの規定に対応していない場合に、移動端末機をハンドオーバさせてしまうことによる移動端末機の呼切断と、移動端末機とＩＭＳネットワークとの間の状態不一致を防ぐことができる。
　上記ハンドオーバ判定装置は、前記コマンド送信部は、さらに、前記ハンドオーバ判定部がハンドオーバ不可と判定した場合は、前記ハンドオーバ制御装置に前記ハンドオーバ要求の送信を抑止させるためのハンドオーバ抑止コマンドを前記ハンドオーバ拒否コマンドに付加して送信し、前記ハンドオーバ抑止コマンドを前記ハンドオーバ制御装置に送信後、前記ハンドオーバ判定部がハンドオーバ可能と判定した場合、前記ハンドオーバ制御装置に前記ハンドオーバ要求の送信の抑止を解除させるためのハンドオーバ抑止解除コマンドを送信してもよい。 According to this configuration, whether or not the handover can be performed based on the call state of the mobile terminal and the mobile terminal information indicating whether or not the mobile terminal can be handed over in the call state of the mobile terminal If the call state does not correspond to the SRVCC regulation, the call disconnection of the mobile terminal due to the handover of the mobile terminal and the state mismatch between the mobile terminal and the IMS network Can be prevented.
In the handover determination device, the command transmission unit further outputs a handover suppression command for causing the handover control device to suppress transmission of the handover request when the handover determination unit determines that handover is not possible. A handover for causing the handover control device to cancel the suppression of transmission of the handover request when the handover determination unit determines that a handover is possible after transmitting the handover suppression command to the handover control device A suppression release command may be transmitted.
　こうすれば、移動端末機の呼の状態と、移動端末機の呼の状態が呼び出し中状態でもハンドオーバが可能な移動端末機であるか否かの移動端末機情報に基づき、ハンドオーバを要求できるか否かを判定でき、ハンドオーバができない期間はハンドオーバ制御装置にハンドオーバ要求の送信を抑止させることができるので、呼の状態がＳＲＶＣＣの規定に対応していない場合に移動端末機をハンドオーバさせてしまうことによる移動端末機の呼切断と、移動端末機とＩＭＳネットワークとの間の状態不一致を防ぐことができ、さらに不要なハンドオーバ要求の送信を抑止させることにより、基地局機器とＩＭＳネットワークとの間の無駄なトラヒックを削減することができる。 In this way, whether the handover can be requested based on the mobile terminal information indicating whether the mobile terminal is in a callable state and whether or not the mobile terminal is in a ringing state. Since it is possible to determine whether or not, and during the period when handover is not possible, the handover control apparatus can suppress transmission of a handover request, so that the mobile terminal is handed over when the call state does not comply with the SRVCC regulations. Can prevent call disconnection of the mobile terminal and state mismatch between the mobile terminal and the IMS network, and further suppress transmission of an unnecessary handover request, thereby preventing the base station device and the IMS network from transmitting. Unnecessary traffic can be reduced.
　本発明のある態様によるハンドオーバ制御装置は、第１のネットワーク通信網と前記第１のネットワーク通信網と共通のサービスエリアを有する第２のネットワーク通信網とで音声通話またはビデオ通話による通話が可能な移動端末機をハンドオーバさせる要求をハンドオーバ判定装置に送信するハンドオーバ制御装置であって、前記第１のネットワーク通信網に在圏している前記移動端末機が送信する無線品質情報を受信する無線品質情報受信部と、前記無線品質情報に基づき前記第１のネットワーク通信網での前記移動端末機の無線品質が劣化しているか否か判定する無線品質判定部と、前記無線品質判定部が前記移動端末機の無線品質が劣化したと判定した場合、前記移動端末機を前記第１のネットワーク通信網から前記第２のネットワーク通信網にハンドオーバさせて通話を継続させるためのハンドオーバ要求を前記ハンドオーバ判定装置に送信するハンドオーバ要求送信部と、前記ハンドオーバ要求送信部が送信した前記ハンドオーバ要求に対し前記ハンドオーバ判定装置から返信されてくるハンドオーバ応答コマンドを受信するコマンド受信部と、前記コマンド受信部が前記ハンドオーバを実施させるための前記ハンドオーバ応答コマンドを受信した場合は前記移動端末機に前記ハンドオーバを実施させるハンドオーバ指示を送るハンドオーバ応答部と、前記コマンド受信部が前記ハンドオーバを実施させないためのハンドオーバ拒否コマンドを受信した場合は前記移動端末機に前記ハンドオーバ指示を送信しないハンドオーバ拒否部と、前記コマンド受信部が前記ハンドオーバ要求の送信を抑止させるためのハンドオーバ抑止コマンドを受信した場合は前記ハンドオーバ要求送信部を動作させず、前記コマンド受信部が前記ハンドオーバ要求の送信の抑止を解除させるためのハンドオーバ抑止解除コマンドを受信した場合は前記ハンドオーバ要求送信部を動作させるハンドオーバ要求送信制限部と、を備えることを特徴とする。 A handover control apparatus according to an aspect of the present invention is capable of making a voice call or a video call between a first network communication network and a second network communication network having a common service area with the first network communication network. A handover control apparatus that transmits a request for handover of a mobile terminal to a handover determination apparatus, wherein the radio quality information receives radio quality information transmitted by the mobile terminal residing in the first network communication network A reception unit; a radio quality determination unit that determines whether or not the radio quality of the mobile terminal in the first network communication network is degraded based on the radio quality information; and the radio quality determination unit includes the mobile terminal If it is determined that the wireless quality of the mobile device has deteriorated, the mobile terminal is moved from the first network communication network to the second network. A handover request transmission unit for transmitting a handover request for continuing a call by handover to a work communication network to the handover determination device, and a response from the handover determination device to the handover request transmitted by the handover request transmission unit. A command receiving unit that receives a handover response command, and a handover response unit that, when the command receiving unit receives the handover response command for performing the handover, transmits a handover instruction for causing the mobile terminal to perform the handover A handover rejection unit that does not transmit the handover instruction to the mobile terminal when the command reception unit receives a handover rejection command for preventing the handover from being performed, and the command reception unit When a handover suppression command for suppressing transmission of a handover request is received, the handover request transmission unit is not operated, and the command reception unit receives a handover suppression cancellation command for canceling suppression of transmission of the handover request. A handover request transmission limiting unit that operates the handover request transmission unit.
　この構成によれば、移動端末機の呼の状態と、移動端末機の呼の状態が呼び出し中状態でもハンドオーバが可能な移動端末機であるか否かの移動端末機情報と、ハンドオーバができるか否かを判定するハンドオーバ判定装置からのコマンドに基づきハンドオーバを制御でき、ハンドオーバができない期間はハンドオーバ判定装置からのコマンドに基づきハンドオーバ要求の送信を抑止することができるので、呼の状態がＳＲＶＣＣの規定に対応していない場合に移動端末機をハンドオーバさせてしまうことによる移動端末機の呼切断と、移動端末機とＩＭＳネットワークとの間の状態不一致を防ぐことができ、さらに不要なハンドオーバ要求の送信を抑止させることにより、基地局機器とＩＭＳネットワークとの間の無駄なトラヒックを削減することができる。 According to this configuration, the state of the mobile terminal call, the mobile terminal information indicating whether or not the mobile terminal can be handed over even when the call state of the mobile terminal is ringing, and whether or not the handover can be performed Since the handover can be controlled based on the command from the handover determining device that determines whether or not, and during the period when the handover is not possible, the transmission of the handover request can be suppressed based on the command from the handover determining device. If the mobile terminal is not compatible with the mobile terminal, it is possible to prevent a call disconnection of the mobile terminal due to handover of the mobile terminal and a state mismatch between the mobile terminal and the IMS network, and transmission of an unnecessary handover request. To prevent unnecessary traffic between the base station device and the IMS network. It can be.
　本発明のある態様によるハンドオーバ判定方法は、第１のネットワーク通信網と前記第１のネットワーク通信網と共通のサービスエリアを有する第２のネットワーク通信網とで音声通話またはビデオ通話による通話が可能な移動端末機をハンドオーバさせる要求をハンドオーバ制御装置から受信するハンドオーバ判定方法であって、前記第１のネットワーク通信網で音声通話またはビデオ通話による通話中に前記移動端末機の無線品質の劣化を検出した場合に、前記移動端末機を前記第１のネットワーク通信網から前記第２のネットワーク通信網にハンドオーバさせて通話を継続させるためのハンドオーバ要求または前記ハンドオーバ要求に基づく要求を前記ハンドオーバ制御装置から受信するハンドオーバ要求受信工程と、前記ハンドオーバ要求受信工程が前記ハンドオーバ要求または前記ハンドオーバ要求に基づく要求を受信した場合、前記移動端末機の呼の状態を取得する呼状態取得工程と、前記移動端末機が、前記呼の状態において前記ハンドオーバが可能な移動端末機であるか否かの情報を含む移動端末機情報を取得する移動端末機情報取得工程と、前記呼状態取得工程が取得した前記呼の状態と前記移動端末機情報取得工程が取得した前記移動端末機情報とに基づき、前記呼の状態において前記ハンドオーバが可能な移動端末機ではない場合は、ハンドオーバ不可と判定し、前記呼の状態において前記ハンドオーバが可能な移動端末機である場合は、ハンドオーバ可能と判定するハンドオーバ判定工程と、前記ハンドオーバ判定工程がハンドオーバ不可と判定した場合は、前記ハンドオーバ制御装置に前記ハンドオーバを実施させないためのハンドオーバ拒否コマンドを送信し、前記ハンドオーバ判定工程がハンドオーバ可能と判定した場合は、前記ハンドオーバ制御装置に前記ハンドオーバを実施させるためのハンドオーバ応答コマンドを送信するコマンド送信工程と、を含むことを特徴とする。 A handover determination method according to an aspect of the present invention is capable of making a voice call or a video call between a first network communication network and a second network communication network having a common service area with the first network communication network. A handover determination method for receiving a request for handover of a mobile terminal from a handover control apparatus, wherein degradation of radio quality of the mobile terminal is detected during a voice call or a video call in the first network communication network In this case, a handover request for handing over the mobile terminal from the first network communication network to the second network communication network and continuing a call or a request based on the handover request is received from the handover control apparatus. A handover request receiving step; A call request obtaining step for obtaining a call state of the mobile terminal when the handover request receiving step receives the handover request or the request based on the handover request; and the mobile terminal receives the handover in the call state. Mobile terminal information acquisition step of acquiring mobile terminal information including information on whether or not the mobile terminal is capable of, and the call state and mobile terminal information acquisition step of the call state acquisition step If the mobile terminal is not capable of the handover in the call state based on the mobile terminal information acquired by the mobile terminal, the mobile terminal determines that the handover is not possible, and the mobile terminal capable of the handover in the call state If there is a handover determination step for determining that handover is possible, and if the handover determination step determines that handover is not possible Transmits a handover reject command for preventing the handover control apparatus from performing the handover, and when the handover determination step determines that a handover is possible, a handover response command for causing the handover control apparatus to perform the handover And a command transmission step of transmitting.
　この構成によれば、移動端末機の呼の状態と、移動端末機の呼の状態においてハンドオーバが可能な移動端末機であるか否かの移動端末機情報とに基づき、ハンドオーバができるか否かを判定できるので、呼の状態がＳＲＶＣＣの規定に対応していない場合に移動端末機をハンドオーバさせてしまうことによる移動端末機の呼切断や、移動端末機とＩＭＳネットワークとの間の状態不一致を防ぐことができる。 According to this configuration, whether or not the handover can be performed based on the call state of the mobile terminal and the mobile terminal information indicating whether or not the mobile terminal can be handed over in the call state of the mobile terminal Therefore, when a call state does not correspond to the SRVCC specification, a call disconnection of the mobile terminal due to handover of the mobile terminal or a state mismatch between the mobile terminal and the IMS network Can be prevented.
　本発明のある態様によるハンドオーバ制御方法は、第１のネットワーク通信網と前記第１のネットワーク通信網と共通のサービスエリアを有する第２のネットワーク通信網とで音声通話またはビデオ通話による通話が可能な移動端末機をハンドオーバさせる要求をハンドオーバ判定装置に送信するハンドオーバ制御方法であって、前記第１のネットワーク通信網に在圏している前記移動端末機が送信する無線品質情報を受信する無線品質情報受信工程と、前記無線品質情報に基づき前記第１のネットワーク通信網での前記移動端末機の無線品質が劣化しているか否か判定する無線品質判定工程と、前記無線品質判定工程が前記移動端末機の無線品質が劣化したと判定した場合、前記移動端末機を前記第１のネットワーク通信網から前記第２のネットワーク通信網にハンドオーバさせて通話を継続させるためのハンドオーバ要求を前記ハンドオーバ判定装置に送信するハンドオーバ要求送信工程と、前記ハンドオーバ要求送信工程が送信した前記ハンドオーバ要求に対し前記ハンドオーバ判定装置から返信されてくるハンドオーバ応答コマンドを受信するコマンド受信工程と、前記コマンド受信工程が前記ハンドオーバを実施させるための前記ハンドオーバ応答コマンドを受信した場合は前記移動端末機に前記ハンドオーバを実施させるハンドオーバ指示を送るハンドオーバ応答工程と、前記コマンド受信工程が前記ハンドオーバを実施させないためのハンドオーバ拒否コマンドを受信した場合は前記移動端末機に前記ハンドオーバ指示を送信しないハンドオーバ拒否工程と、前記コマンド受信工程が前記ハンドオーバ要求の送信を抑止させるためのハンドオーバ抑止コマンドを受信した場合は前記ハンドオーバ要求送信工程を動作させず、前記コマンド受信工程が前記ハンドオーバ要求の送信の抑止を解除させるためのハンドオーバ抑止解除コマンドを受信した場合は前記ハンドオーバ要求送信工程を動作させるハンドオーバ要求送信制限工程と、を含むことを特徴とする。 A handover control method according to an aspect of the present invention enables a voice call or a video call between a first network communication network and a second network communication network having a common service area with the first network communication network. A handover control method for transmitting a request for handover of a mobile terminal to a handover determination device, wherein the radio quality information is received for the radio quality information transmitted by the mobile terminal residing in the first network communication network. A reception step, a radio quality determination step for determining whether or not the radio quality of the mobile terminal in the first network communication network is degraded based on the radio quality information, and the radio quality determination step includes the mobile terminal If it is determined that the wireless quality of the mobile station has deteriorated, the mobile terminal is moved from the first network communication network to the second network. A handover request transmission step for transmitting a handover request for continuing a call by handing over to a network communication network to the handover determination device; and a response from the handover determination device to the handover request transmitted by the handover request transmission step. A command receiving step for receiving an incoming handover response command, and a handover response step for sending a handover instruction for causing the mobile terminal to execute the handover when the command receiving step receives the handover response command for causing the handover to be performed And a handover rejection step of not transmitting the handover instruction to the mobile terminal when the command reception step receives a handover rejection command for preventing the handover from being performed, and When the command reception step receives a handover suppression command for suppressing transmission of the handover request, the handover request transmission step is not operated, and the command reception step cancels suppression of transmission of the handover request. A handover request transmission restriction step of operating the handover request transmission step when a suppression release command is received.
　この構成によれば、移動端末機の呼の状態と、移動端末機の呼の状態が呼び出し中状態でもハンドオーバが可能であるか否かの移動端末機情報と、ハンドオーバができるか否かを判定するハンドオーバ判定装置からのコマンドに基づきハンドオーバを制御でき、ハンドオーバができない期間はハンドオーバ判定装置からのコマンドに基づきハンドオーバ要求の送信を抑止することができるので、呼の状態がＳＲＶＣＣの規定に対応していない場合に移動端末機をハンドオーバさせてしまうことによる移動端末機の呼切断や、移動端末機とＩＭＳネットワークとの間の状態不一致を防ぐことができ、さらに不要なハンドオーバ要求の送信を抑止させることにより、基地局機器とＩＭＳネットワークとの間の無駄なトラヒックを削減することができる。 According to this configuration, the state of the mobile terminal call, the mobile terminal information indicating whether handover is possible even when the mobile terminal call state is ringing, and whether the handover is possible are determined. Since the handover can be controlled based on the command from the handover determination device to be performed and the transmission of the handover request can be suppressed based on the command from the handover determination device during the period when the handover cannot be performed, the call state corresponds to the SRVCC regulation. In this case, it is possible to prevent call disconnection of the mobile terminal due to handover of the mobile terminal in the absence of the mobile terminal and state mismatch between the mobile terminal and the IMS network, and further suppress transmission of an unnecessary handover request. Can reduce wasted traffic between base station equipment and IMS network Kill.
　本発明のある態様によるハンドオーバ判定プログラムは、第１のネットワーク通信網と前記第１のネットワーク通信網と共通のサービスエリアを有する第２のネットワーク通信網とで音声通話またはビデオ通話による通話が可能な移動端末機をハンドオーバさせる要求をハンドオーバ制御装置から受信するハンドオーバ判定プログラムであって、コンピュータに、前記第１のネットワーク通信網で音声通話またはビデオ通話による通話中に前記移動端末機の無線品質の劣化を検出した場合に、前記移動端末機を前記第１のネットワーク通信網から前記第２のネットワーク通信網にハンドオーバさせて通話を継続させるためのハンドオーバ要求または前記ハンドオーバ要求に基づく要求を前記ハンドオーバ制御装置から受信するハンドオーバ要求受信ステップと、前記ハンドオーバ要求受信ステップが前記ハンドオーバ要求または前記ハンドオーバ要求に基づく要求を受信した場合、前記移動端末機の呼の状態を取得する呼状態取得ステップと、前記移動端末機が、前記呼の状態において前記ハンドオーバが可能な移動端末機であるか否かの情報を含む移動端末機情報を取得する移動端末機情報取得ステップと、前記呼状態取得ステップが取得した前記呼の状態と前記移動端末機情報取得ステップが取得した前記移動端末機情報とに基づき、前記呼の状態において前記ハンドオーバが可能な移動端末機ではない場合は、ハンドオーバ不可と判定し、前記呼の状態において前記ハンドオーバが可能な移動端末機である場合は、ハンドオーバ可能と判定するハンドオーバ判定ステップと、前記ハンドオーバ判定ステップがハンドオーバ不可と判定した場合は、前記ハンドオーバ制御装置に前記ハンドオーバを実施させないためのハンドオーバ拒否コマンドを送信し、前記ハンドオーバ判定ステップがハンドオーバ可能と判定した場合は、前記ハンドオーバ制御装置に前記ハンドオーバを実施させるためのハンドオーバ応答コマンドを送信するコマンド送信ステップと、を実行させることを特徴とする。 A handover determination program according to an aspect of the present invention enables a voice call or a video call between a first network communication network and a second network communication network having a common service area with the first network communication network. A handover determination program for receiving a request for handover of a mobile terminal from a handover control device, wherein the wireless quality of the mobile terminal is degraded during a voice call or a video call over the first network communication network. A handover request for handing over the mobile terminal from the first network communication network to the second network communication network and continuing a call or a request based on the handover request when the mobile terminal is detected. Handover received from A reception request step, a call state acquisition step of acquiring a call state of the mobile terminal when the handover request reception step receives the handover request or a request based on the handover request, and the mobile terminal A mobile terminal information acquisition step of acquiring mobile terminal information including information on whether or not the mobile terminal is capable of handover in a call state; the call state acquired in the call state acquisition step; and Based on the mobile terminal information acquired in the mobile terminal information acquisition step, if the mobile terminal is not capable of handover in the call state, it is determined that handover is not possible, and the handover is not performed in the call state. A handover determination step for determining that handover is possible, When the handover determination step determines that handover is not possible, a handover rejection command for not causing the handover control apparatus to perform the handover is transmitted, and when the handover determination step determines that handover is possible, the handover control apparatus And a command transmission step of transmitting a handover response command for performing the handover.
　この構成によれば、移動端末機の呼の状態と、移動端末機の呼の状態においてハンドオーバが可能であるか否かの移動端末機情報とに基づき、ハンドオーバができるか否かを判定できるので、呼の状態がＳＲＶＣＣの規定に対応していない場合に移動端末機をハンドオーバさせてしまうことによる移動端末機の呼切断や、移動端末機とＩＭＳネットワークとの間の状態不一致を防ぐことができる。 According to this configuration, it is possible to determine whether or not handover can be performed based on the call state of the mobile terminal and the mobile terminal information indicating whether or not handover is possible in the call state of the mobile terminal. , It is possible to prevent call disconnection of the mobile terminal due to handover of the mobile terminal when the call state does not comply with the SRVCC regulation and state mismatch between the mobile terminal and the IMS network. .
　本発明のある態様によるハンドオーバ制御プログラムは、第１のネットワーク通信網と前記第１のネットワーク通信網と共通のサービスエリアを有する第２のネットワーク通信網とで音声通話またはビデオ通話による通話が可能な移動端末機をハンドオーバさせる要求をハンドオーバ判定装置に送信するハンドオーバ制御プログラムであって、コンピュータに、前記第１のネットワーク通信網に在圏している前記移動端末機が送信する無線品質情報を受信する無線品質情報受信ステップと、前記無線品質情報に基づき前記第１のネットワーク通信網での前記移動端末機の無線品質が劣化しているか否か判定する無線品質判定ステップと、前記無線品質判定ステップが前記移動端末機の無線品質が劣化したと判定した場合、前記移動端末機を前記第１のネットワーク通信網から前記第２のネットワーク通信網にハンドオーバさせて通話を継続させるためのハンドオーバ要求を前記ハンドオーバ判定装置に送信するハンドオーバ要求送信ステップと、前記ハンドオーバ要求送信ステップが送信した前記ハンドオーバ要求に対し前記ハンドオーバ判定装置から返信されてくるハンドオーバ応答コマンドを受信するコマンド受信ステップと、前記コマンド受信ステップが前記ハンドオーバを実施させるための前記ハンドオーバ応答コマンドを受信した場合は前記移動端末機に前記ハンドオーバを実施させるハンドオーバ指示を送るハンドオーバ応答ステップと、前記コマンド受信ステップが前記ハンドオーバを実施させないためのハンドオーバ拒否コマンドを受信した場合は前記移動端末機に前記ハンドオーバ指示を送信しないハンドオーバ拒否ステップと、前記コマンド受信ステップが前記ハンドオーバ要求の送信を抑止させるためのハンドオーバ抑止コマンドを受信した場合は前記ハンドオーバ要求送信ステップを動作させず、前記コマンド受信ステップが前記ハンドオーバ要求の送信の抑止を解除させるためのハンドオーバ抑止解除コマンドを受信した場合は前記ハンドオーバ要求送信ステップを動作させるハンドオーバ要求送信制限ステップと、を実行させることを特徴とする。 A handover control program according to an aspect of the present invention enables a voice call or a video call between a first network communication network and a second network communication network having a common service area with the first network communication network. A handover control program for transmitting a request for handover of a mobile terminal to a handover determination device, wherein the computer receives radio quality information transmitted by the mobile terminal residing in the first network communication network A radio quality information receiving step, a radio quality determination step for determining whether radio quality of the mobile terminal in the first network communication network is degraded based on the radio quality information, and the radio quality determination step. If it is determined that the radio quality of the mobile terminal has deteriorated, the mobile terminal is A handover request transmission step for transmitting a handover request for continuing a call by handover from the first network communication network to the second network communication network, and the handover request transmission step transmitted by the handover request transmission step. A command reception step for receiving a handover response command returned from the handover determination device in response to a handover request, and when the command reception step receives the handover response command for causing the handover to be performed, the mobile terminal A handover response step of sending a handover instruction for carrying out the handover, and the mobile terminal when the command receiving step receives a handover rejection command for preventing the handover from being carried out When the handover rejection step for not transmitting the handover instruction and the command reception step for receiving a handover suppression command for suppressing transmission of the handover request, the command reception step does not operate the handover request transmission step. When a handover suppression release command for canceling suppression of transmission of the handover request is received, a handover request transmission restriction step for operating the handover request transmission step is executed.
　この構成によれば、移動端末機の呼の状態と、移動端末機の呼の状態が呼び出し中状態でもハンドオーバが可能であるか否かの移動端末機情報と、ハンドオーバができるか否かを判定するハンドオーバ判定装置からのコマンドに基づきハンドオーバを制御でき、ハンドオーバができない期間はハンドオーバ判定装置からのコマンドに基づきハンドオーバ要求の送信を抑止することができるので、呼の状態がＳＲＶＣＣの規定に対応していない場合に移動端末機をハンドオーバさせてしまうことによる移動端末機の呼切断と、移動端末機とＩＭＳネットワークとの間の状態不一致を防ぐことができ、さらに不要なハンドオーバ要求の送信を抑止させることにより、基地局機器とＩＭＳネットワークとの間の無駄なトラヒックを削減することができる。 According to this configuration, the state of the mobile terminal call, the mobile terminal information indicating whether handover is possible even when the mobile terminal call state is ringing, and whether the handover is possible are determined. Since the handover can be controlled based on the command from the handover determination device to be performed and the transmission of the handover request can be suppressed based on the command from the handover determination device during the period when the handover cannot be performed, the call state corresponds to the SRVCC regulation. In this case, it is possible to prevent call disconnection of the mobile terminal due to handover of the mobile terminal in the absence of the mobile terminal and state mismatch between the mobile terminal and the IMS network, and further suppress transmission of an unnecessary handover request. Can reduce wasted traffic between base station equipment and IMS network Kill.
　本発明によれば、移動端末機の呼の状態と、移動端末機の呼の状態においてハンドオーバが可能であるか否かの移動端末機情報と、ハンドオーバができるか否かを判定するハンドオーバ判定装置からのコマンドに基づきハンドオーバを制御でき、ハンドオーバができない期間はハンドオーバ判定装置からのコマンドに基づきハンドオーバ要求の送信を抑止することができるので、呼の状態がＳＲＶＣＣの規定に対応していない場合に移動端末機をハンドオーバさせてしまうことによる移動端末機の呼切断や、移動端末機とＩＭＳネットワークとの間の状態不一致を防ぐことができ、さらに不要なハンドオーバ要求の送信を抑止させることにより、基地局機器とＩＭＳネットワークとの間の無駄なトラヒックを削減することができる。 According to the present invention, the call status of the mobile terminal, the mobile terminal information indicating whether or not handover is possible in the call status of the mobile terminal, and the handover determination device for determining whether or not the handover is possible The handover can be controlled based on the command from the mobile station, and the transmission of the handover request can be suppressed based on the command from the handover determination device during the period when the handover is not possible. It is possible to prevent call disconnection of the mobile terminal due to handover of the terminal and state mismatch between the mobile terminal and the IMS network, and further, by suppressing transmission of unnecessary handover requests, the base station Wasteful traffic between the device and the IMS network can be reduced.
本発明の第１の実施形態に係るハンドオーバ判定装置及びハンドオーバ制御装置の構成を示す構成図である。It is a block diagram which shows the structure of the handover determination apparatus and handover control apparatus which concern on the 1st Embodiment of this invention. 本発明の第１の実施形態に係るハンドオーバ判定装置の動作を示す流れ図である。It is a flowchart which shows operation | movement of the handover determination apparatus which concerns on the 1st Embodiment of this invention. 本発明の第１の実施形態に係るハンドオーバ判定装置のハンドオーバ判定部の動作を示す流れ図である。4 is a flowchart showing an operation of a handover determination unit of the handover determination apparatus according to the first embodiment of the present invention. 本発明の第１の実施形態に係るハンドオーバ制御装置の動作を示す流れ図である。3 is a flowchart showing the operation of the handover control apparatus according to the first embodiment of the present invention. 本発明の第１の実施形態に係るハンドオーバ判定装置及びハンドオーバ制御装置の動作を示すシーケンス図である。It is a sequence diagram which shows operation | movement of the handover determination apparatus and handover control apparatus which concern on the 1st Embodiment of this invention. 本発明の第２の実施形態に係るハンドオーバ判定装置及びハンドオーバ制御装置の構成を示す構成図である。It is a block diagram which shows the structure of the handover determination apparatus and handover control apparatus which concern on the 2nd Embodiment of this invention. 本発明の第２の実施形態に係るハンドオーバ判定装置の動作を示す流れ図である。It is a flowchart which shows operation | movement of the handover determination apparatus which concerns on the 2nd Embodiment of this invention. 本発明の第２の実施形態に係るハンドオーバ制御装置の動作を示す流れ図である。It is a flowchart which shows operation | movement of the handover control apparatus which concerns on the 2nd Embodiment of this invention. 本発明の第２の実施形態に係るハンドオーバ判定装置及びハンドオーバ制御装置の動作を示すシーケンス図である。It is a sequence diagram which shows operation | movement of the handover determination apparatus and handover control apparatus which concern on the 2nd Embodiment of this invention. ＬＴＥ網のサービスエリアと３Ｇ網のサービスエリアとの関係を示す構成図である。It is a block diagram which shows the relationship between the service area of a LTE network, and the service area of a 3G network. 従来のＳＲＶＣＣの動作を示すシーケンス図である。It is a sequence diagram which shows the operation | movement of the conventional SRVCC.
　以下、ハンドオーバ判定装置及びハンドオーバ制御装置の実施形態について図面に従って説明する。以下に参照する各図において、他の図と同等部分は同一符号を付して説明する。
　（第１の実施形態）
　先ず、第１の実施形態に係るハンドオーバ判定装置及びハンドオーバ制御装置の構成について、図１を参照して説明する。図１は、第１の実施形態に係るハンドオーバ判定装置２００及びハンドオーバ制御装置１００の構成を示す構成図である。 Hereinafter, embodiments of a handover determination device and a handover control device will be described with reference to the drawings. In each figure referred to below, the same parts as those in the other figures will be described with the same reference numerals.
(First embodiment)
First, the configuration of the handover determination device and the handover control device according to the first embodiment will be described with reference to FIG. FIG. 1 is a configuration diagram illustrating configurations of a handover determination device 200 and a handover control device 100 according to the first embodiment.
　図１（Ｂ）に示すように、移動端末機（ＵＥ：User Equipment）３０は、第１のネットワーク通信網であるＬＴＥ（Long Term Evolution）網１０と、第１のネットワーク通信網と共通のサービスエリアを有する第２のネットワーク通信網である３Ｇ（3rd Generation、第３世代移動通信システム）網２０と、で音声通話またはビデオ通話による通話が可能である。ＬＴＥ網１０は、図１（Ａ）の基地局機器（ｅＮＢ：eNodeB）４０とＭＭＥ（Mobile Management Entity）４２とＭＳＣ（Multimedia Switching Center）　Ｓｅｒｖｅｒ４４とＩＭＳ（IP Multimedia Subsystem）ネットワーク（ＩＭＳ　ＮＷ）５０とを含んでいる。３Ｇ網２０は、３Ｇネットワーク（３Ｇ　ＮＷ）６０を含んでいる。また、図１（Ｂ）に現在のＬＴＥ網１０のサービスエリアと３Ｇ網２０のサービスエリアの関係性を示す。図１（Ｂ）に示すように、ＬＴＥ網１０のサービスエリアは、３Ｇ網２０のサービスエリアと共通しており、３Ｇ網２０のサービスエリアよりも狭いことを示している。 As shown in FIG. 1B, a mobile terminal (UE: User Equipment) 30 is a service common to the LTE (Long Term Evolution) network 10 which is a first network communication network and the first network communication network. A voice call or a video call can be made with a 3G (3rd generation, third generation mobile communication system) network 20 which is a second network communication network having an area. The LTE network 10 includes a base station device (eNB: eNodeB) 40, an MME (Mobile Management Entity) 42, an MSC (Multimedia Switching Center) Server 44, and an IMS (IP Multimedia Subsystem) network (IMS NW) 50 shown in FIG. Is included. The 3G network 20 includes a 3G network (3G NW) 60. FIG. 1B shows the relationship between the current service area of the LTE network 10 and the service area of the 3G network 20. As shown in FIG. 1B, the service area of the LTE network 10 is common to the service area of the 3G network 20 and is narrower than the service area of the 3G network 20.
　図１（Ａ）に示すように、基地局機器４０は、ハンドオーバ制御装置１００を含んでいる。ＩＭＳネットワーク５０は、ハンドオーバ判定装置２００と、Ｓ－ＣＳＣＦ（Serving Call Session Control Function）やＰ－ＣＳＣＦ（Proxy Call Session Control Function）などで構成される呼制御装置７０と、ホーム加入者サーバ（ＨＳＳ：Home Subscriber Server）などで構成された移動端末機情報管理装置８０と、を含んでいる。
　ハンドオーバ制御装置１００は、無線品質情報受信部１１０と、無線品質判定部１２０と、ハンドオーバ要求送信部１３０と、コマンド受信部１４０と、ハンドオーバ応答部１５０と、ハンドオーバ拒否部１６０と、を含んでいる。
　ハンドオーバ判定装置２００は、ハンドオーバ要求受信部２１０と、呼状態取得部２２０と、移動端末機情報取得部２３０と、ハンドオーバ判定部２４０と、コマンド送信部２５０と、を含んでいる。 As shown in FIG. 1A, the base station device 40 includes a handover control apparatus 100. The IMS network 50 includes a handover determination device 200, a call control device 70 including a S-CSCF (Serving Call Session Control Function) and a P-CSCF (Proxy Call Session Control Function), and a home subscriber server (HSS: Mobile terminal information management device 80 configured by Home Subscriber Server) and the like.
The handover control apparatus 100 includes a radio quality information receiving unit 110, a radio quality determination unit 120, a handover request transmission unit 130, a command reception unit 140, a handover response unit 150, and a handover rejection unit 160. .
The handover determination apparatus 200 includes a handover request reception unit 210, a call state acquisition unit 220, a mobile terminal information acquisition unit 230, a handover determination unit 240, and a command transmission unit 250.
　移動端末機３０は、ＬＴＥ網１０における無線品質の値が基地局機器４０から指定された無線品質の閾値よりも下回った場合などに、無線品質情報３２を基地局機器４０に含まれるハンドオーバ制御装置１００の無線品質情報受信部１１０に送信する。
　無線品質判定部１２０は、無線品質情報受信部１１０が受信した無線品質情報３２に基づき、移動端末機３０の無線品質が劣化しているか否かを判定する。
　ハンドオーバ要求送信部１３０は、移動端末機３０の無線品質が劣化していると判定した場合に、移動端末機３０をＬＴＥ網１０から３Ｇ網２０にハンドオーバさせるハンドオーバ要求１３２をＭＭＥ４２に送信する。ＭＭＥ４２は、ＭＳＣ　Ｓｅｒｖｅｒ４４経由でＳＲＶＣＣ要求をＩＭＳネットワーク５０に含まれるハンドオーバ判定装置２００のハンドオーバ要求受信部２１０に送信する。 The mobile terminal 30 includes a radio network quality information 32 included in the base station device 40 when the radio quality value in the LTE network 10 is lower than the radio quality threshold specified by the base station device 40. 100 wireless quality information receivers 110.
The radio quality determination unit 120 determines whether the radio quality of the mobile terminal 30 has deteriorated based on the radio quality information 32 received by the radio quality information reception unit 110.
When it is determined that the radio quality of the mobile terminal 30 has deteriorated, the handover request transmission unit 130 transmits a handover request 132 for handing over the mobile terminal 30 from the LTE network 10 to the 3G network 20 to the MME 42. The MME 42 transmits the SRVCC request to the handover request receiving unit 210 of the handover determination device 200 included in the IMS network 50 via the MSC Server 44.
　ハンドオーバ判定装置２００のハンドオーバ要求受信部２１０は、ハンドオーバ要求送信部１３０から送信されたハンドオーバ要求１３２に基づくＳＲＶＣＣ要求を受信する。
　呼状態取得部２２０は、移動端末機３０の呼の状態を、移動端末機３０の呼の状態を監視している呼制御装置７０から取得する。呼の状態としては、発信中状態、呼び出し中状態、着信中状態、通話中状態および割込通話中状態が挙げられる。発信中状態とは、移動端末機３０が発信を開始した直後の状態である。呼び出し中状態とは、発信状態の後、発信側移動端末機３０が相手の移動端末機と通信を確立する前までの間で、相手を呼び出している状態である。また、呼び出し中状態とは、着側端末機が着信し、着信に応答するまでの間で呼び出しをしている状態である。着信中状態とは、着側移動端末機が着信し、呼び出しを開始する前までの状態である。通話中状態とは、相手の移動端末機と音声通話またはビデオ通話ができる状態である。割込通話中状態とは、通話中の相手の移動端末機との通話を保留にしたまま、後からかかってきた他の移動端末機との間での通話ができる状態である（割込通話とは、例えば「キャッチホン」（日本電信電話株式会社の登録商標）サービスを利用した通話をいう）。 The handover request receiver 210 of the handover determination device 200 receives an SRVCC request based on the handover request 132 transmitted from the handover request transmitter 130.
The call state acquisition unit 220 acquires the call state of the mobile terminal 30 from the call control device 70 that monitors the call state of the mobile terminal 30. Examples of the call state include a calling state, a ringing state, an incoming call state, a call state, and an interrupt call state. The calling state is a state immediately after the mobile terminal 30 starts sending. The in-calling state is a state in which the calling party mobile terminal 30 is calling the other party after the calling state and before the originating mobile terminal 30 establishes communication with the other party mobile terminal. The calling state is a state in which a call is made until the called terminal receives an incoming call and responds to the incoming call. The incoming call state is a state before the incoming mobile terminal receives an incoming call and before calling. The in-call state is a state in which a voice call or a video call can be made with a partner mobile terminal. An interrupt call state is a state in which a call can be made with another mobile terminal that has been received later while the call with the other party's mobile terminal is on hold (interrupt call). For example, “Catch Phone” (referred to as a call using a service registered by Nippon Telegraph and Telephone Corporation).
　移動端末機情報取得部２３０は、移動端末機３０が、その呼の状態が呼び出し中状態でもハンドオーバが可能なａＳＲＶＣＣ（alerting ＳＲＶＣＣ）対応の移動端末機（つまり、ａＳＲＶＣＣの機能を備えている移動端末機）であるか否かの移動端末機情報を、移動端末機情報管理装置８０から取得する。また、移動端末機情報取得部２３０は、移動端末機３０が、その呼の状態が呼が確立する前の状態で送出されるガイダンス中状態でもハンドオーバが可能なｂＳＲＶＣＣ（ＳＲＶＣＣ before ringing）対応の移動端末機（つまり、ｂＳＲＶＣＣの機能を備えている移動端末機）であるか否かの移動端末機情報を、移動端末機情報管理装置８０から取得する。
　ハンドオーバ判定部２４０は、呼状態取得部２２０が取得した移動端末機３０の呼の状態と、移動端末機情報取得部２３０が取得した移動端末機情報とに基づき、ハンドオーバ可能か可かを判定する。 The mobile terminal information acquisition unit 230 is a mobile terminal having an aSRVCC (alerting SRVCC) -compatible mobile terminal capable of performing handover even when the mobile terminal 30 is in a ringing state (that is, a mobile terminal having aSRVCC function). Mobile terminal information is acquired from the mobile terminal information management device 80. In addition, the mobile terminal information acquisition unit 230 is a bSRVCC (SRVCC before ringing) compatible mobile device that can perform handover even when the mobile terminal 30 is in a guidance state that is transmitted in a state before the call is established. The mobile terminal information is acquired from the mobile terminal information management device 80 as to whether or not the terminal is a terminal (that is, a mobile terminal having a bSRVCC function).
The handover determination unit 240 determines whether or not handover is possible based on the call state of the mobile terminal 30 acquired by the call state acquisition unit 220 and the mobile terminal information acquired by the mobile terminal information acquisition unit 230. .
　コマンド送信部２５０は、ハンドオーバ判定部２４０がハンドオーバ可能と判定した場合、ハンドオーバ制御装置１００にハンドオーバを実施させるためのＳＲＶＣＣ応答をＭＳＣ　Ｓｅｒｖｅｒ４４経由でＭＭＥ４２に送信する。ＭＭＥ４２は、ＳＲＶＣＣ応答に基づくハンドオーバ応答コマンド２５２をハンドオーバ制御装置１００のコマンド受信部１４０に送信する。
　また、コマンド送信部２５０は、ハンドオーバ判定部２４０がハンドオーバ不可と判定した場合、ハンドオーバ制御装置１００にハンドオーバを実施させないためのＳＲＶＣＣ拒否をＭＳＣ　Ｓｅｒｖｅｒ４４経由でＭＭＥ４２に送信する。ＭＭＥ４２は、ＳＲＶＣＣ拒否に基づくハンドオーバ拒否コマンド２６２をハンドオーバ制御装置１００のコマンド受信部１４０に送信する。 When the handover determination unit 240 determines that the handover is possible, the command transmission unit 250 transmits an SRVCC response for causing the handover control apparatus 100 to perform the handover to the MME 42 via the MSC Server 44. The MME 42 transmits a handover response command 252 based on the SRVCC response to the command receiving unit 140 of the handover control apparatus 100.
Further, when the handover determination unit 240 determines that the handover is not possible, the command transmission unit 250 transmits an SRVCC rejection for preventing the handover control apparatus 100 from performing the handover to the MME 42 via the MSC Server 44. The MME 42 transmits a handover rejection command 262 based on the SRVCC rejection to the command receiving unit 140 of the handover control apparatus 100.
　ハンドオーバ制御装置１００のコマンド受信部１４０は、ハンドオーバ判定装置２００のコマンド送信部２５０が送信するハンドオーバ応答コマンド２５２と、ハンドオーバ拒否コマンド２６２と、を受信する。
　ハンドオーバ応答部１５０は、コマンド受信部１４０が受信したコマンドにハンドオーバ応答コマンド２５２が含まれている場合は、移動端末機３０にハンドオーバを実施させるためのハンドオーバ指示１５２を送信する。
　ハンドオーバ拒否部１６０は、コマンド受信部１４０が受信したコマンドにハンドオーバ拒否コマンド２６２が含まれている場合は、移動端末機３０にハンドオーバ指示１５２を送信しない。 The command reception unit 140 of the handover control apparatus 100 receives the handover response command 252 and the handover rejection command 262 that are transmitted by the command transmission unit 250 of the handover determination apparatus 200.
If the command received by the command receiver 140 includes the handover response command 252, the handover response unit 150 transmits a handover instruction 152 for causing the mobile terminal 30 to execute the handover.
The handover rejection unit 160 does not transmit the handover instruction 152 to the mobile terminal 30 when the handover rejection command 262 is included in the command received by the command reception unit 140.
　＜ハンドオーバ判定装置２００の動作＞
　第１の実施形態に係るハンドオーバ判定装置の動作について、図２を参照して説明する。図２は、第１の実施形態に係るハンドオーバ判定装置２００の動作を示す流れ図である。なお、以下では、非特許文献３のリリース９で規定されたＳＲＶＣＣおよび非特許文献３および４のリリース１０で規定された、呼の状態が呼び出し中状態でもハンドオーバが可能なａＳＲＶＣＣ対応の端末機である移動端末機３０が音声呼を取得し（音声通話を行い）、音声呼の状態と移動端末機情報とに基づき、ハンドオーバ可能か否かを判定する場合について説明する。
　図２に示すように、先ず、ステップＳ２０２では、ハンドオーバ要求受信部２１０が、ハンドオーバ要求送信部１３０から送信されたハンドオーバ要求１３２に基づくＳＲＶＣＣ要求を受信するまで待機し、ハンドオーバ要求１３２基づくＳＲＶＣＣ要求を受信したらステップＳ２０４に移行する。 <Operation of Handover Determination Device 200>
The operation of the handover determination device according to the first embodiment will be described with reference to FIG. FIG. 2 is a flowchart showing the operation of the handover determination apparatus 200 according to the first embodiment. In the following, the SRVCC specified in Release 9 of Non-Patent Document 3 and the aSRVCC compatible terminal specified in Release 10 of Non-Patent Documents 3 and 4 are capable of handover even when the call state is ringing. A case will be described in which a certain mobile terminal 30 acquires a voice call (performs a voice call) and determines whether or not handover is possible based on the state of the voice call and mobile terminal information.
As shown in FIG. 2, first, in step S202, the handover request reception unit 210 waits until it receives an SRVCC request based on the handover request 132 transmitted from the handover request transmission unit 130, and sends an SRVCC request based on the handover request 132. If received, the process proceeds to step S204.
　ステップＳ２０４では、移動端末機情報取得部２３０が、移動端末機３０がその音声呼の状態が呼び出し中状態でもハンドオーバが可能なａＳＲＶＣＣ対応の端末機であるか否かの移動端末機情報を移動端末機情報管理装置８０から取得する。その後、処理をステップＳ２０６に移行する。なお、移動端末機情報取得部２３０が、移動端末機３０の移動端末機情報を移動端末機情報管理装置８０から既に取得している場合は、ステップＳ２０４の処理は行わなくてもよい。また、移動端末機情報取得部２３０は、移動端末機３０がその音声呼の状態が着信中状態でもハンドオーバが可能な端末機であるか否かの移動端末機情報や、その音声呼の状態が発信中状態でもハンドオーバが可能な端末機であるか否かの移動端末機情報を移動端末機情報管理装置８０から取得するようにしてもよい。 In step S204, the mobile terminal information acquisition unit 230 displays mobile terminal information indicating whether or not the mobile terminal 30 is an aSRVCC compatible terminal that can be handed over even when the voice call state is ringing. Obtained from the machine information management device 80. Thereafter, the process proceeds to step S206. If the mobile terminal information acquisition unit 230 has already acquired the mobile terminal information of the mobile terminal 30 from the mobile terminal information management device 80, the process of step S204 may not be performed. In addition, the mobile terminal information acquisition unit 230 may determine whether the mobile terminal 30 is a terminal that can be handed over even when the voice call is in an incoming call state, and whether the voice call status is You may make it acquire from the mobile terminal information management apparatus 80 the mobile terminal information of whether it is a terminal which can be handed over in the state in the middle of transmission.
　ステップＳ２０６では、呼状態取得部２２０が、移動端末機３０の音声呼の状態（発信中／呼び出し中／着信中／通話中／割込通話中等）を、移動端末機３０の音声呼の状態を監視している呼制御装置７０から取得する。その後、処理をステップＳ２０８に移行する。なお、ステップＳ２０４とステップＳ２０６との順序は、逆であっても（つまり、ステップＳ２０２でハンドオーバ要求１３２を受信したら、ステップＳ２０６に移行し、ステップＳ２０４に移行し、ステップＳ２０８に移行するようにしても）構わない。
　ステップＳ２０８では、ハンドオーバ判定部２４０を実行する。その後、処理をステップＳ２１０に移行する。
　ステップＳ２１０では、ハンドオーバ判定部２４０がハンドオーバ可能と判定した場合はステップＳ２１２に移行する。一方、ステップＳ２１０において、ハンドオーバ判定部２４０がハンドオーバ不可と判定した場合はステップＳ２１４に移行する。 In step S206, the call state acquisition unit 220 displays the state of the voice call of the mobile terminal 30 (calling / calling / incoming / calling / interrupt call etc.) and the state of the voice call of the mobile terminal 30. Obtained from the monitored call control device 70. Thereafter, the process proceeds to step S208. Even if the order of step S204 and step S206 is reversed (that is, when the handover request 132 is received in step S202, the process proceeds to step S206, proceeds to step S204, and proceeds to step S208). Also)
In step S208, the handover determination unit 240 is executed. Thereafter, the process proceeds to step S210.
In step S210, when the handover determining unit 240 determines that a handover is possible, the process proceeds to step S212. On the other hand, when the handover determining unit 240 determines that the handover is not possible in step S210, the process proceeds to step S214.
　ステップＳ２１２では、コマンド送信部２５０を実行することにより、ハンドオーバを実施させるためのＳＲＶＣＣ応答をＭＳＣ　Ｓｅｒｖｅｒ４４経由でＭＭＥ４２に送信する。ＭＭＥ４２は、ＳＲＶＣＣ応答に基づくハンドオーバ応答コマンド２５２をハンドオーバ制御装置１００のコマンド受信部１４０に送信する。その後、処理をステップＳ２０２に移行する。
　一方、ステップＳ２１４では、コマンド送信部２５０を実行することにより、ハンドオーバを実施させないためのＳＲＶＣＣ拒否をＭＳＣ　Ｓｅｒｖｅｒ４４経由でＭＭＥ４２に送信する。ＭＭＥ４２は、ＳＲＶＣＣ拒否に基づくハンドオーバ拒否コマンド２６２をハンドオーバ制御装置１００のコマンド受信部１４０に送信する。その後、処理をステップＳ２０２に移行する。 In step S212, by executing the command transmission unit 250, an SRVCC response for performing the handover is transmitted to the MME 42 via the MSC Server 44. The MME 42 transmits a handover response command 252 based on the SRVCC response to the command receiving unit 140 of the handover control apparatus 100. Thereafter, the process proceeds to step S202.
On the other hand, in step S214, by executing the command transmission unit 250, an SRVCC rejection not to perform the handover is transmitted to the MME 42 via the MSC Server 44. The MME 42 transmits a handover rejection command 262 based on the SRVCC rejection to the command receiving unit 140 of the handover control apparatus 100. Thereafter, the process proceeds to step S202.
　＜ハンドオーバ判定部２４０の動作＞
　ハンドオーバ判定部２４０の動作について、図３を参照して説明する。図３は、ハンドオーバ判定部２４０の動作を示す流れ図である。なお、以下では、移動端末機３０が音声呼を取得し（音声通話を行い）、音声呼の状態と移動端末機情報とに基づき、ハンドオーバ可能か否かを判定する場合について説明する。
　図３（Ａ）に示すように、先ず、ステップＳ２４２では、移動端末機３０の音声呼の状態が、発信中状態か着信中状態か呼び出し中状態か通話中状態か割込通話中状態かの何れの状態であるか判定し、移動端末機３０の音声呼の状態が発信中状態である場合はステップＳ２４６に移行する。また、ステップＳ２４２において、移動端末機３０の音声呼の状態が着信中状態である場合はステップＳ２４６に移行する。また、ステップＳ２４２において、移動端末機３０の音声呼の状態が呼び出し中状態である場合はステップＳ２４４に移行する。また、ステップＳ２４２において、移動端末機３０の音声呼の状態が通話中状態である場合はステップＳ２４８に移行する。また、ステップＳ２４２において、移動端末機３０の音声呼の状態が割込通話中状態である場合はステップＳ２４８に移行する。 <Operation of Handover Determination Unit 240>
The operation of the handover determination unit 240 will be described with reference to FIG. FIG. 3 is a flowchart showing the operation of the handover determination unit 240. Hereinafter, a case will be described in which the mobile terminal 30 acquires a voice call (performs a voice call) and determines whether or not handover is possible based on the voice call state and the mobile terminal information.
As shown in FIG. 3A, first, in step S242, whether the state of the voice call of the mobile terminal 30 is an outgoing call state, an incoming call state, a ringing state, a busy state, or an interrupted call state. It is determined in which state, and if the voice call state of the mobile terminal 30 is the outgoing call state, the process proceeds to step S246. In step S242, if the state of the voice call of the mobile terminal 30 is an incoming call state, the process proceeds to step S246. In step S242, if the voice call state of the mobile terminal 30 is a ringing state, the process proceeds to step S244. In step S242, if the voice call state of the mobile terminal 30 is a busy state, the process proceeds to step S248. In step S242, if the state of the voice call of the mobile terminal 30 is an interrupt call state, the process proceeds to step S248.
　ステップＳ２４４では、移動端末機３０の移動端末機情報がその音声呼の状態が呼び出し中状態でもハンドオーバが可能なａＳＲＶＣＣ対応の端末機であるか否か判定し、ａＳＲＶＣＣ対応の端末機である場合はステップＳ２４８に移行する。一方、ステップＳ２４４において、ａＳＲＶＣＣ対応の端末機ではない場合はステップＳ２４６に移行する。
　ステップＳ２４６では、ハンドオーバ不可と判定し、ハンドオーバ判定部２４０の処理を終了する。
　一方、ステップＳ２４８では、ハンドオーバ可能と判定し、ハンドオーバ判定部２４０の処理を終了する。
　なお、図３（Ａ）では、呼び出し中状態でもハンドオーバが可能なａＳＲＶＣＣ対応の端末機であるか否かを判定するように説明したが、図３（Ｂ）に示すように着信中状態でもＳＲＶＣＣが可能な端末機であるか否かを判定（ステップＳ２５０）したり、発信中状態でもＳＲＶＣＣが可能な端末機であるか否かを判定（ステップＳ２５２）したりするようにしてもよい。 In step S244, it is determined whether or not the mobile terminal information of the mobile terminal 30 is an aSRVCC compatible terminal capable of performing handover even when the voice call state is ringing. The process proceeds to step S248. On the other hand, if the terminal is not aSRVCC compatible terminal in step S244, the process proceeds to step S246.
In step S246, it is determined that the handover is not possible, and the process of the handover determination unit 240 ends.
On the other hand, in step S248, it is determined that the handover is possible, and the processing of the handover determination unit 240 is terminated.
In FIG. 3A, it has been described that it is determined whether or not the terminal is an aSRVCC compatible terminal capable of performing handover even in the ringing state. However, as shown in FIG. It may be determined whether or not the terminal is capable of receiving (step S250), or it may be determined whether or not the terminal is capable of SRVCC even in the outgoing call state (step S252).
　＜ハンドオーバ制御装置１００の動作＞
　第１の実施形態に係るハンドオーバ制御装置１００の動作について、図４を参照して説明する。図４は、第１の実施形態に係るハンドオーバ制御装置１００の動作を示す流れ図である。
　図４に示すように、先ず、ステップＳ１０２では、無線品質情報受信部１１０が無線品質情報３２を受信するまで待機し、受信したらステップＳ１０４に移行する。
　ステップＳ１０４では、無線品質判定部１２０が、無線品質情報３２に基づき、移動端末機３０をハンドオーバさせる必要があるか否かを判定し、必要がある場合はステップＳ１０６に移行する。一方、ステップＳ１０４において、ハンドオーバの必要がない場合はステップＳ１０２に移行する。 <Operation of Handover Control Device 100>
The operation of the handover control apparatus 100 according to the first embodiment will be described with reference to FIG. FIG. 4 is a flowchart showing the operation of the handover control apparatus 100 according to the first embodiment.
As shown in FIG. 4, first, in step S102, the wireless quality information receiving unit 110 waits until it receives the wireless quality information 32, and when it is received, the process proceeds to step S104.
In step S104, the radio quality determination unit 120 determines whether or not the mobile terminal 30 needs to be handed over based on the radio quality information 32. If necessary, the radio quality determination unit 120 proceeds to step S106. On the other hand, if there is no need for handover in step S104, the process proceeds to step S102.
　ステップＳ１０６では、ハンドオーバ要求送信部１３０が、ハンドオーバ要求１３２をＭＭＥ４２に送信する。（ＭＭＥ４２は、ＭＳＣ　Ｓｅｒｖｅｒ４４経由でＳＲＶＣＣ要求をハンドオーバ要求受信部２１０に送信する。）その後、処理をステップＳ１０８に移行する。
　ステップＳ１０８では、コマンド受信部１４０がコマンドを受信するまで待機し、コマンドを受信したらステップＳ１１０に移行する。 In step S106, the handover request transmitter 130 transmits the handover request 132 to the MME 42. (The MME 42 transmits the SRVCC request to the handover request receiving unit 210 via the MSC Server 44.) Then, the process proceeds to Step S108.
In step S108, the process waits until the command receiving unit 140 receives a command. When the command is received, the process proceeds to step S110.
　ステップＳ１１０では、コマンド受信部１４０が受信したコマンドがハンドオーバ応答コマンド２５２であるか否か判定し、ハンドオーバ応答コマンド２５２である場合はステップＳ１１２に移行する。一方、ステップＳ１１０において、ハンドオーバ応答コマンド２５２ではない（つまり、ハンドオーバ拒否コマンド２６２である）場合はステップＳ１１４に移行する。
　ステップＳ１１２では、ハンドオーバ応答部１５０を実行し、移動端末機３０にハンドオーバ指示１５２を送信する。その後、処理をステップＳ１０２に移行する。
　一方、ステップＳ１１４では、ハンドオーバ拒否部１６０を実行し、移動端末機３０にハンドオーバを実施させるためのハンドオーバ指示１５２を送信しない。その後、処理をステップＳ１０２に移行する。 In step S110, it is determined whether the command received by the command receiver 140 is a handover response command 252. If the command is a handover response command 252, the process proceeds to step S112. On the other hand, if it is not the handover response command 252 (that is, the handover rejection command 262) in step S110, the process proceeds to step S114.
In step S112, the handover response unit 150 is executed, and a handover instruction 152 is transmitted to the mobile terminal 30. Thereafter, the process proceeds to step S102.
Meanwhile, in step S114, the handover rejection unit 160 is executed, and the handover instruction 152 for causing the mobile terminal 30 to perform the handover is not transmitted. Thereafter, the process proceeds to step S102.
　＜ハンドオーバ判定装置２００及びハンドオーバ制御装置１００の動作＞
　第１の実施形態に係るハンドオーバ制御装置１００の動作について、図５及び図２～４を参照して説明する。図５は、第１の実施形態に係るハンドオーバ判定装置２００及びハンドオーバ制御装置１００の動作を示すシーケンス図である。なお、以下では、移動端末機３０が音声呼を取得し（音声通話を行い）、音声呼の状態と移動端末機情報とに基づき、ハンドオーバ可能か否かを判定する場合について説明する。 <Operations of Handover Determination Device 200 and Handover Control Device 100>
The operation of the handover control apparatus 100 according to the first embodiment will be described with reference to FIG. 5 and FIGS. FIG. 5 is a sequence diagram illustrating operations of the handover determination device 200 and the handover control device 100 according to the first embodiment. Hereinafter, a case will be described in which the mobile terminal 30 acquires a voice call (performs a voice call) and determines whether or not handover is possible based on the voice call state and the mobile terminal information.
　＜発信中状態の動作＞
　移動端末機３０は、音声呼の状態が呼び出し中状態でもハンドオーバが可能なａＳＲＶＣＣ対応の移動端末機であり、ＬＴＥ網１０のサービスエリアの境界付近かつ３Ｇ網２０のサービスエリアの中にいるものとし（図１（Ｂ）参照）、ＬＴＥ網１０の基地局機器４０と通信しているものとして説明する。図５では、移動端末機３０は、時点ｔ０において、音声通話のためのベアラ（bearer）が確立される前の状態（発信中）とする。
　移動端末機３０を持ったユーザが発信操作することにより、相手側移動端末機と音声通話をするための発信が開始される。発信を開始するとともに、移動端末機３０を持ったユーザがＬＴＥ網１０から３Ｇ網２０のサービスエリア付近（図１（Ｂ）参照）に移動したとする。移動端末機３０は、ＬＴＥ網１０の端付近に移動したため、ＬＴＥ網１０の無線品質が劣化してくる。そのため、図５の時点ｔ１で、移動端末機３０は、現在の無線品質が基地局機器４０から指定された無線品質の閾値を下回ったことを示す無線品質情報３２を基地局機器４０に送信する。 <Operation during outgoing call>
The mobile terminal 30 is an aSRVCC compatible mobile terminal that can be handed over even when the voice call is ringing, and is located near the boundary of the LTE network 10 service area and within the 3G network 20 service area. (Refer FIG. 1 (B)), it demonstrates as what is communicating with the base station apparatus 40 of the LTE network 10. FIG. In FIG. 5, the mobile terminal 30 is in a state (during outgoing) before a bearer for voice call is established at time t0.
When a user having the mobile terminal 30 performs a call operation, a call for making a voice call with the counterpart mobile terminal is started. It is assumed that a user having a mobile terminal 30 moves from the LTE network 10 to the vicinity of the service area of the 3G network 20 (see FIG. 1B) while starting transmission. Since the mobile terminal 30 has moved to the vicinity of the end of the LTE network 10, the radio quality of the LTE network 10 deteriorates. Therefore, at time t1 in FIG. 5, the mobile terminal 30 transmits to the base station device 40 the wireless quality information 32 indicating that the current wireless quality is below the threshold value of the wireless quality specified by the base station device 40. .
　基地局機器４０に含まれるハンドオーバ制御装置１００の無線品質情報受信部１１０は、無線品質情報３２を受信する（図４のステップＳ１０２）。
　無線品質判定部１２０は、無線品質情報３２に基づき、移動端末機３０をハンドオーバさせる必要があると判定する（図４のステップＳ１０４）。
　時点ｔ２で、ハンドオーバ要求送信部１３０は、ハンドオーバ要求１３２をＭＭＥ４２に送信する。ＭＭＥ４２は、ＭＳＣ　Ｓｅｒｖｅｒ４４経由でＳＲＶＣＣ要求をハンドオーバ要求受信部２１０に送信する（図４のステップＳ１０６）。
　ハンドオーバ要求受信部２１０は、ハンドオーバ要求１３２に基づくＳＲＶＣＣ要求を受信する（図２のステップＳ２０２）。 The radio quality information receiving unit 110 of the handover control device 100 included in the base station device 40 receives the radio quality information 32 (step S102 in FIG. 4).
The radio quality determination unit 120 determines that the mobile terminal 30 needs to be handed over based on the radio quality information 32 (step S104 in FIG. 4).
At time t2, the handover request transmission unit 130 transmits a handover request 132 to the MME 42. The MME 42 transmits the SRVCC request to the handover request receiving unit 210 via the MSC Server 44 (Step S106 in FIG. 4).
The handover request receiving unit 210 receives an SRVCC request based on the handover request 132 (step S202 in FIG. 2).
　移動端末機情報取得部２３０は、移動端末機３０がその音声呼の状態が呼び出し中状態でもハンドオーバが可能なａＳＲＶＣＣ対応の端末機であるか否かの移動端末機情報を移動端末機情報管理装置８０から取得する（図２のステップＳ２０４）。また、呼状態取得部２２０は、移動端末機３０の音声呼の状態が発信中状態であることを取得する（図２のステップＳ２０６）。ハンドオーバ判定部２４０は、移動端末機３０の音声呼の状態が発信中状態であり、移動端末機３０がＳＲＶＣＣに対応しているタイミングではないため、ハンドオーバ不可と判定する（図２のステップＳ２０８）。 The mobile terminal information acquisition unit 230 stores mobile terminal information indicating whether or not the mobile terminal 30 is an aSRVCC compatible terminal that can be handed over even when the voice call is ringing. 80 (step S204 in FIG. 2). In addition, the call state acquisition unit 220 acquires that the state of the voice call of the mobile terminal 30 is a calling state (step S206 in FIG. 2). The handover determination unit 240 determines that the handover is not possible because the voice call state of the mobile terminal 30 is the outgoing call state and the mobile terminal 30 is not at a timing corresponding to SRVCC (step S208 in FIG. 2). .
　時点ｔ３で、コマンド送信部２５０を実行することにより、ハンドオーバを実施させないためのＳＲＶＣＣ拒否をＭＳＣ　Ｓｅｒｖｅｒ４４経由でＭＭＥ４２に送信する。ＭＭＥ４２は、ＳＲＶＣＣ拒否に基づくハンドオーバ拒否コマンド２６２をハンドオーバ制御装置１００のコマンド受信部１４０に送信する（図２のステップＳ２１４）。ハンドオーバ制御装置１００は、ハンドオーバ拒否部１６０を実行し、移動端末機３０にハンドオーバを実施させるためのハンドオーバ指示１５２を送信しない（図４のステップＳ１１４）。 At time t3, by executing the command transmission unit 250, an SRVCC rejection for not performing the handover is transmitted to the MME 42 via the MSC Server 44. The MME 42 transmits a handover rejection command 262 based on the SRVCC rejection to the command receiving unit 140 of the handover control apparatus 100 (step S214 in FIG. 2). The handover control apparatus 100 executes the handover rejection unit 160 and does not transmit the handover instruction 152 for causing the mobile terminal 30 to perform the handover (step S114 in FIG. 4).
　＜呼び出し中状態の動作＞
　時点ｔ４で、移動端末機３０の音声呼の状態が呼び出し中状態に遷移する。
　時点ｔ５で、移動端末機３０は、現在の無線品質が基地局機器４０から指定された無線品質の閾値を未だに下回っていることを示す無線品質情報３２を基地局機器４０に送信する。
　基地局機器４０に含まれるハンドオーバ制御装置１００の無線品質情報受信部１１０は、無線品質情報３２を受信する（図４のステップＳ１０２）。
　無線品質判定部１２０は、無線品質情報３２に基づき、移動端末機３０をハンドオーバさせる必要があると判定する（図４のステップＳ１０４）。
　時点ｔ６で、ハンドオーバ要求送信部１３０は、ハンドオーバ要求１３２をＭＭＥ４２に送信する。ＭＭＥ４２は、ＭＳＣ　Ｓｅｒｖｅｒ４４経由でＳＲＶＣＣ要求をハンドオーバ要求受信部２１０に送信する（図４のステップＳ１０６）。 <Operation in calling state>
At time t4, the state of the voice call of the mobile terminal 30 changes to the ringing state.
At time t <b> 5, the mobile terminal 30 transmits to the base station device 40 the wireless quality information 32 indicating that the current wireless quality is still below the wireless quality threshold specified by the base station device 40.
The radio quality information receiving unit 110 of the handover control device 100 included in the base station device 40 receives the radio quality information 32 (step S102 in FIG. 4).
The radio quality determination unit 120 determines that the mobile terminal 30 needs to be handed over based on the radio quality information 32 (step S104 in FIG. 4).
At time t6, the handover request transmission unit 130 transmits a handover request 132 to the MME 42. The MME 42 transmits the SRVCC request to the handover request receiving unit 210 via the MSC Server 44 (Step S106 in FIG. 4).
　ハンドオーバ要求受信部２１０は、ハンドオーバ要求１３２に基づくＳＲＶＣＣ要求を受信する（図２のステップＳ２０２）。なお、移動端末機情報取得部２３０は、移動端末機情報を既に取得している。また、呼状態取得部２２０は、移動端末機３０の音声呼の状態が呼び出し中状態であることを取得する（図２のステップＳ２０６）。ハンドオーバ判定部２４０は、移動端末機３０の音声呼の状態が呼び出し中状態でかつ移動端末機３０の移動端末機情報がその音声呼の状態が呼び出し中状態でもハンドオーバが可能なａＳＲＶＣＣ対応の端末機であるので、ハンドオーバ可能と判定する（図２のステップＳ２０８）。 The handover request receiving unit 210 receives the SRVCC request based on the handover request 132 (step S202 in FIG. 2). The mobile terminal information acquisition unit 230 has already acquired mobile terminal information. In addition, the call state acquisition unit 220 acquires that the voice call state of the mobile terminal 30 is a ringing state (step S206 in FIG. 2). The handover determining unit 240 is an aSRVCC compatible terminal capable of performing handover even when the voice call state of the mobile terminal 30 is in the ringing state and the mobile terminal information of the mobile terminal 30 is in the ringing state of the voice call. Therefore, it is determined that handover is possible (step S208 in FIG. 2).
　時点ｔ７で、コマンド送信部２５０を実行することにより、ＳＲＶＣＣ応答をＭＳＣ　Ｓｅｒｖｅｒ４４経由でＭＭＥ４２に送信する。ＭＭＥ４２は、ＳＲＶＣＣ応答に基づくハンドオーバ応答コマンド２５２をハンドオーバ制御装置１００のコマンド受信部１４０に送信する（図２のステップＳ２１４）。
　時点ｔ８で、ハンドオーバ制御装置１００は、ハンドオーバ応答部１５０を実行し、移動端末機３０にハンドオーバを実施させるためのハンドオーバ指示１５２を送信する（図４のステップＳ１１２）。
　時点ｔ９で、移動端末機３０は、ハンドオーバを実行する。移動端末機３０は、ＬＴＥ網１０から３Ｇ網２０にハンドオーバされ（図１（Ｂ）参照）、時点ｔ１０で３Ｇネットワーク６０による通話中状態に切り替わることを示している。つまり、ＳＲＶＣＣが動作したことを示している。 By executing the command transmission unit 250 at time t7, the SRVCC response is transmitted to the MME 42 via the MSC Server 44. The MME 42 transmits a handover response command 252 based on the SRVCC response to the command receiving unit 140 of the handover control apparatus 100 (step S214 in FIG. 2).
At time t8, the handover control apparatus 100 executes the handover response unit 150 and transmits a handover instruction 152 for causing the mobile terminal 30 to perform handover (step S112 in FIG. 4).
At time t9, the mobile terminal 30 executes a handover. The mobile terminal 30 is handed over from the LTE network 10 to the 3G network 20 (see FIG. 1B), and is switched to a busy state by the 3G network 60 at time t10. That is, it indicates that SRVCC has been operated.
　以上に述べた第１の実施形態によれば、以下の効果が得られる。
　第１の実施形態では、移動端末機３０の呼の状態と、移動端末機３０の呼の状態が呼び出し中状態でもハンドオーバが可能な移動端末機であるか否かの移動端末機情報とに基づき、ハンドオーバができるか否かを判定できるので、移動端末機が対応していない呼の状態で移動端末機３０をハンドオーバさせてしまうことによる移動端末機３０の呼切断と、移動端末機３０とＩＭＳネットワーク５０との間の状態不一致を防ぐことができる。 According to the first embodiment described above, the following effects can be obtained.
In the first embodiment, based on the call state of the mobile terminal 30 and the mobile terminal information indicating whether or not the mobile terminal 30 can be handed over even when the call state of the mobile terminal 30 is in the ringing state. Since it is possible to determine whether or not handover is possible, call disconnection of the mobile terminal 30 due to handover of the mobile terminal 30 in a call state that the mobile terminal does not support, and the mobile terminal 30 and the IMS A state mismatch with the network 50 can be prevented.
　（変形例１）
　第１の実施形態では、移動端末機３０は、その呼の状態が呼び出し中状態でもハンドオーバが可能なａＳＲＶＣＣ対応の端末機であるものとして説明したが、ａＳＲＶＣＣ非対応の端末機についても同様に説明できる。なお、本変形例１におけるａＳＲＶＣＣ非対応の端末機とは、非特許文献３のリリース９に規定されたＳＲＶＣＣには対応しているが、非特許文献３および４のリリース１０以降で規定されたａＳＲＶＣＣには非対応の端末機を示す。
　移動端末機３０がａＳＲＶＣＣ非対応の端末機の場合は、発信中状態および呼び出し中状態においては、図５の時点t０と同様の処理を行う。通話中状態においては、図５の時点ｔ４と同様の処理を行う。 (Modification 1)
In the first embodiment, the mobile terminal 30 has been described as an aSRVCC compatible terminal capable of performing a handover even when the call state is ringing. However, the mobile terminal 30 is similarly described for an aSRVCC non-compatible terminal. it can. Note that the aSRVCC incompatible terminal in the first modification corresponds to SRVCC defined in Release 9 of Non-Patent Document 3, but is defined in Release 10 and later of Non-Patent Documents 3 and 4. aSRVCC indicates a non-compatible terminal.
When the mobile terminal 30 is a terminal that does not support aSRVCC, the same processing as that at time t0 in FIG. 5 is performed in the calling state and the calling state. In the call state, processing similar to that at time t4 in FIG. 5 is performed.
　図５において、時点ｔ４の「呼び出し中」を「音声通話中」と読み替えて本変形例１の構成を説明する。図５の時点ｔ６で、ハンドオーバ要求１３２に基づくＳＲＶＣＣ要求を受信すると、ハンドオーバ判定部２４０は、移動端末機３０の音声呼の状態が通話中状態であるので、ハンドオーバ可能と判定する（図２のステップＳ２０８）。時点ｔ７以降は、第１の実施形態と同様である。
　また、移動端末機３０の呼の状態が、発信中状態か呼び出し中状態か着信中状態か通話中状態か割込通話中状態かの何れかの状態として説明したが、音声ガイダンスに繋がったガイダンス中状態や切断中状態を含めてもよい。なお、本変形例１で説明するａＳＲＶＣＣ非対応の移動端末機３０は、呼が確立される前のガイダンス中状態や切断中状態のハンドオーバに対応していない。このため、ハンドオーバ判定部２４０は、移動端末機３０の呼の状態が呼が確立される前のガイダンス中状態や切断中状態の場合、ハンドオーバ不可と判定すればよい。 In FIG. 5, the configuration of the first modification will be described by replacing “calling” at time t <b> 4 with “voice call in progress”. When the SRVCC request based on the handover request 132 is received at time t6 in FIG. 5, the handover determination unit 240 determines that the handover is possible because the state of the voice call of the mobile terminal 30 is a busy state (FIG. 2). Step S208). After time t7, it is the same as in the first embodiment.
In addition, the call state of the mobile terminal 30 has been described as one of a calling state, a ringing state, an incoming call state, a call state, or an interrupt call state. An intermediate state or a cutting state may be included. Note that the aSRVCC-incompatible mobile terminal 30 described in the first modification does not support a handover in a guidance state or a disconnection state before a call is established. For this reason, the handover determining unit 240 may determine that the handover is not possible when the call state of the mobile terminal 30 is a guidance state or a disconnection state before the call is established.
　ここで、音声ガイダンスとしては、呼が確立する前の状態で送出されるガイダンス（例えば発信先移動端末機が圏外にある場合に送出される圏外トーキなど）、呼が確立された後の状態で送出されるガイダンス（例えば迷惑電話からの着信を拒否する場合に送出される迷惑電話ガイダンスなど）の双方を含む。また、留守番電話サービスのガイダンスは、例えば、呼が確立する前の状態で送出されるガイダンスと呼が確立された後の状態で送出されるガイダンスとの双方から構成される。なお、呼が確立された後の状態でガイダンスが送出される際の動作は、通話中と同様に、通常のＳＲＶＣＣを起動可能である。このため、本変形例１では、呼が確立された後のガイダンス中状態は通話中状態に含む。また、呼が確立された後のガイダンス中状態は通話中状態に含まずに、呼が確立される前のガイダンス中状態と同様にハンドオーバ判定部２４０によってハンドオーバ不可と判定されるようにしてもよい。 Here, as voice guidance, guidance sent before the call is established (for example, out-of-service talk when the destination mobile terminal is out of service area), or after the call is established It includes both guidance that is sent out (for example, the nuisance call guidance that is sent out when an incoming call from a nuisance call is rejected). In addition, the guidance for the answering machine service includes, for example, both guidance sent before the call is established and guidance sent after the call is established. Note that the operation when the guidance is transmitted in a state after the call is established can start a normal SRVCC as in the case of a call. For this reason, in the first modification, the busy state after the call is established is included in the busy state. Further, the in-guidance state after the call is established is not included in the busy state, and the handover determination unit 240 may determine that the handover is impossible as in the in-guidance state before the call is established. .
　なお、本変形例１は、移動端末機３０がａＳＲＶＣＣ非対応の端末機である場合についての例であり、移動端末機３０の呼の状態が呼が確立される前のガイダンス中状態や切断中状態の場合に、ハンドオーバ判定部２４０がハンドオーバ不可と判定する動作を一例として記載したが、ハンドオーバ不可と判定する動作以外の他の動作が規定されてもよい。移動端末機３０の呼の状態が呼が確立される前のガイダンス中状態や切断中状態である場合の移動端末機３０の動作をどのように規定するかは、その移動端末機３０の能力とネットワークの実装次第である。 The first modification is an example of a case where the mobile terminal 30 is a terminal that does not support aSRVCC, and the state of the call of the mobile terminal 30 is in a guidance state or a disconnection state before the call is established. In the case of the state, the operation that the handover determining unit 240 determines that the handover is impossible is described as an example, but other operations other than the operation that determines that the handover is impossible may be defined. How to define the operation of the mobile terminal 30 when the call state of the mobile terminal 30 is in a guidance state or a disconnection state before the call is established depends on the capability of the mobile terminal 30. It depends on the network implementation.
　（変形例２）
　第１の実施形態では、移動端末機３０は、その呼の状態が呼び出し中状態でもハンドオーバが可能なａＳＲＶＣＣ対応の端末機であるものとして説明し、変形例１では、移動端末機３０は、ａＳＲＶＣＣ非対応の端末機であるものとして説明したが、ｂＳＲＶＣＣ対応の端末機についても同様に説明できる。本変形例２では、移動端末機３０は、その呼の状態が呼が確立する前の状態で送出されるガイダンス中状態でもハンドオーバが可能なｂＳＲＶＣＣ対応の端末機であるものとして説明する。なお、本変形例２におけるｂＳＲＶＣＣ対応の端末機とは、上述したＳＲＶＣＣおよびａＳＲＶＣＣ、ならびに非特許文献３および４のリリース１２以降で規定されたｂＳＲＶＣＣに対応の端末機を示す。 (Modification 2)
In the first embodiment, the mobile terminal 30 is described as an aSRVCC compatible terminal capable of performing handover even when the call state is ringing. In the first modification, the mobile terminal 30 Although described as a non-compatible terminal, a bSRVCC compatible terminal can be similarly described. In the second modification, the mobile terminal 30 will be described as a bSRVCC compatible terminal capable of performing handover even when the call state is in a guidance state that is transmitted in a state before the call is established. In addition, the terminal corresponding to bSRVCC in the second modification refers to a terminal compatible with the above-described SRVCC and aSRVCC and bSRVCC defined in Release 12 and later of Non-Patent Documents 3 and 4.
　移動端末機３０がｂＳＲＶＣＣ対応の端末機の場合は、発信中状態においては図５の時点t０と同様の処理を行う。呼が確立される前のガイダンス中状態、呼び出し中状態および通話中状態（呼が確立された後のガイダンス中状態を含む）においては、図５の時点ｔ４と同様の処理を行う。ここで、呼が確立される前のガイダンス中状態での動作はｂＳＲＶＣＣとして起動可能であり、呼び出し中状態での動作はａＳＲＶＣＣとして起動可能であり、通話中状態（呼が確立された後のガイダンス中状態を含む）での動作はＳＲＶＣＣとして起動可能である。 If the mobile terminal 30 is a bSRVCC compatible terminal, the same processing as at time t0 in FIG. In the in-guidance state before the call is established, the in-calling state, and the talking state (including the in-guidance state after the call is established), the same processing as at time t4 in FIG. 5 is performed. Here, the operation in the guidance state before the call is established can be activated as bSRVCC, the operation in the ringing state can be activated as aSRVCC, and the busy state (guidance after the call is established) The operation in the middle state can be started as SRVCC.
　図５において、時点t４の「呼び出し中」を「呼が確立される前のガイダンス中」と読み替えて本変形例２の構成を説明する。図５の時点ｔ６で、ハンドオーバ要求１３２に基づくＳＲＶＣＣ要求を受信すると、ハンドオーバ判定部２４０は、移動端末機３０の音声呼の状態が呼が確立される前のガイダンス中状態であるので、ハンドオーバ可能と判定する（図２のステップＳ２０８）。この場合、呼が確立される前の状態で送出されるガイダンス中状態での動作であるため、ハンドオーバ可能と判定後の動作はｂＳＲＶＣＣとして起動可能である。時点ｔ７以降は、第１の実施形態と同様である。 In FIG. 5, the configuration of the second modification will be described by replacing “calling” at time t4 with “guidance before call is established”. When the SRVCC request based on the handover request 132 is received at time t6 in FIG. 5, the handover determining unit 240 can perform handover because the voice call state of the mobile terminal 30 is in the guidance state before the call is established. (Step S208 in FIG. 2). In this case, since the operation is in the in-guidance state transmitted in the state before the call is established, the operation after determining that the handover is possible can be started as bSRVCC. After time t7, it is the same as in the first embodiment.
　また、移動端末機３０の呼の状態として切断中状態を含めてもよい。本変形例２で説明するｂＳＲＶＣＣ対応の移動端末機３０は、切断中状態のハンドオーバに対応していない。このため、ハンドオーバ判定部２４０は、移動端末機３０の呼の状態が切断中状態の場合、ハンドオーバ不可と判定すればよい。
　なお、本変形例２は、移動端末機３０がｂＳＲＶＣＣ対応の端末機である場合についての例であり、移動端末機３０の呼の状態が切断中状態の場合に、ハンドオーバ判定部２４０がハンドオーバ不可と判定する動作を一例として記載したが、ハンドオーバ不可と判定する動作以外の他の動作が規定されてもよい。移動端末機３０の呼の状態が切断中状態である場合の移動端末機３０のその他の動作については、変形例１と同様である。 In addition, a disconnecting state may be included as a call state of the mobile terminal 30. The bSRVCC-compatible mobile terminal 30 described in the second modification does not support handover in a disconnected state. For this reason, the handover determination unit 240 may determine that the handover is not possible when the call state of the mobile terminal 30 is in the disconnecting state.
The second modification is an example in which the mobile terminal 30 is a bSRVCC compatible terminal. When the mobile terminal 30 is in a disconnected state, the handover determining unit 240 cannot perform a handover. The operation for determining that the handover is performed is described as an example, but other operations other than the operation for determining that the handover is not possible may be defined. Other operations of the mobile terminal 30 when the call state of the mobile terminal 30 is in the disconnecting state are the same as in the first modification.
　（第２の実施形態）
　第２の実施形態に係るハンドオーバ判定装置及びハンドオーバ制御装置の構成について、第１の実施形態に係るハンドオーバ判定装置２００及びハンドオーバ制御装置１００の構成と異なる点を、図６を参照して説明する。第２の実施形態に係るハンドオーバ判定装置２０００及びハンドオーバ制御装置１０００は、図１（Ａ）のハンドオーバ判定装置２００及びハンドオーバ制御装置１００を置き換えるものである。ハンドオーバ制御装置１０００は、図１（Ａ）のハンドオーバ制御装置１００にハンドオーバ要求送信制限部１７０がさらに含まれ構成される。また、ハンドオーバ判定装置２０００は、図１（Ａ）のハンドオーバ判定装置２００のコマンド送信部２５０がコマンド送信部２５００に置き換わり構成される。また、ハンドオーバ判定装置２０００及びハンドオーバ制御装置１０００は、ハンドオーバ抑止コマンド２７２とハンドオーバ抑止解除コマンド２８２とがさらに含まれ構成される。 (Second Embodiment)
Differences from the configurations of the handover determination device 200 and the handover control device 100 according to the first embodiment will be described with reference to FIG. 6 regarding the configurations of the handover determination device and the handover control device according to the second embodiment. A handover determination device 2000 and a handover control device 1000 according to the second embodiment replace the handover determination device 200 and the handover control device 100 in FIG. The handover control apparatus 1000 is configured by further including a handover request transmission restriction unit 170 in the handover control apparatus 100 of FIG. In addition, the handover determination device 2000 is configured by replacing the command transmission unit 250 of the handover determination device 200 of FIG. In addition, the handover determination device 2000 and the handover control device 1000 further include a handover suppression command 272 and a handover suppression release command 282.
　図６は、第２の実施形態に係るハンドオーバ判定装置２０００及びハンドオーバ制御装置１０００の構成を示す構成図である。
　基地局機器４０は、ハンドオーバ制御装置１０００を含んでいる。ＩＭＳネットワーク５０は、ハンドオーバ判定装置２０００を含んでいる。
　ハンドオーバ制御装置１０００は、無線品質情報受信部１１０と、無線品質判定部１２０と、ハンドオーバ要求送信部１３０と、コマンド受信部１４０と、ハンドオーバ応答部１５０と、ハンドオーバ拒否部１６０と、ハンドオーバ要求送信制限部１７０と、を含んでいる。 FIG. 6 is a configuration diagram illustrating configurations of the handover determination device 2000 and the handover control device 1000 according to the second embodiment.
The base station device 40 includes a handover control apparatus 1000. The IMS network 50 includes a handover determination device 2000.
The handover control apparatus 1000 includes a radio quality information reception unit 110, a radio quality determination unit 120, a handover request transmission unit 130, a command reception unit 140, a handover response unit 150, a handover rejection unit 160, and a handover request transmission restriction. Part 170.
　ハンドオーバ判定装置２０００は、ハンドオーバ要求受信部２１０と、呼状態取得部２２０と、移動端末機情報取得部２３０と、ハンドオーバ判定部２４０と、コマンド送信部２５００と、を含んでいる。
　コマンド送信部２５００は、ハンドオーバ判定部２４０がハンドオーバ可能と判定した場合、ハンドオーバ制御装置１０００にハンドオーバを実施させるためのＳＲＶＣＣ応答をＭＳＣ　Ｓｅｒｖｅｒ４４経由でＭＭＥ４２に送信する。ＭＭＥ４２は、ＳＲＶＣＣ応答に基づくハンドオーバ応答コマンド２５２をハンドオーバ制御装置１０００のコマンド受信部１４０に送信する。 The handover determination device 2000 includes a handover request reception unit 210, a call state acquisition unit 220, a mobile terminal information acquisition unit 230, a handover determination unit 240, and a command transmission unit 2500.
When the handover determination unit 240 determines that the handover is possible, the command transmission unit 2500 transmits an SRVCC response for causing the handover control apparatus 1000 to perform the handover to the MME 42 via the MSC Server 44. The MME 42 transmits a handover response command 252 based on the SRVCC response to the command receiving unit 140 of the handover control apparatus 1000.
　また、コマンド送信部２５００は、ハンドオーバ判定部２４０がハンドオーバ不可と判定した場合、ハンドオーバ制御装置１０００にハンドオーバを実施させないためのＳＲＶＣＣ拒否をＭＳＣ　Ｓｅｒｖｅｒ４４経由でＭＭＥ４２に送信する。ＭＭＥ４２は、ＳＲＶＣＣ拒否に基づくハンドオーバ拒否コマンド２６２をハンドオーバ制御装置１０００のコマンド受信部１４０に送信する。
　さらに、コマンド送信部２５００は、ハンドオーバ判定部２４０がハンドオーバ不可と判定した場合、ハンドオーバ制御装置１０００にハンドオーバ要求１３２の送信を抑止させるためのＳＲＶＣＣ抑止をＭＳＣ　Ｓｅｒｖｅｒ４４経由でＭＭＥ４２に送信する。ＭＭＥ４２は、ＳＲＶＣＣ抑止に基づくハンドオーバ抑止コマンド２７２をハンドオーバ拒否コマンド２６２に付加してハンドオーバ制御装置１０００のコマンド受信部１４０に送信する。 Further, when the handover determining unit 240 determines that the handover is not possible, the command transmission unit 2500 transmits an SRVCC rejection for preventing the handover control apparatus 1000 from performing the handover to the MME 42 via the MSC Server 44. The MME 42 transmits a handover rejection command 262 based on the SRVCC rejection to the command reception unit 140 of the handover control apparatus 1000.
Further, when the handover determination unit 240 determines that the handover is not possible, the command transmission unit 2500 transmits SRVCC suppression for the handover control apparatus 1000 to suppress transmission of the handover request 132 to the MME 42 via the MSC Server 44. The MME 42 adds a handover suppression command 272 based on SRVCC suppression to the handover rejection command 262 and transmits it to the command receiving unit 140 of the handover control apparatus 1000.
　また、コマンド送信部２５００は、ハンドオーバ抑止コマンド２７２をハンドオーバ制御装置１０００に送信したら、ハンドオーバ判定部２４０の判定がハンドオーバ可能に遷移するまで待機する。ハンドオーバ判定部２４０がハンドオーバ可能と判定した場合、ハンドオーバ制御装置１０００にハンドオーバ要求の送信の抑止を解除させるためのＳＲＶＣＣ抑止解除をＭＳＣ　Ｓｅｒｖｅｒ４４経由でＭＭＥ４２に送信する。ＭＭＥ４２は、ＳＲＶＣＣ抑止解除に基づくハンドオーバ抑止解除コマンド２８２をハンドオーバ制御装置１０００のコマンド受信部１４０に送信する。 Further, when the command transmission unit 2500 transmits the handover suppression command 272 to the handover control apparatus 1000, the command transmission unit 2500 waits until the determination of the handover determination unit 240 transitions to enable handover. When the handover determination unit 240 determines that the handover is possible, the handover control apparatus 1000 transmits to the MME 42 via the MSC Server 44 the SRVCC suppression release for canceling the suppression of transmission of the handover request. The MME 42 transmits a handover suppression cancellation command 282 based on the SRVCC suppression cancellation to the command reception unit 140 of the handover control apparatus 1000.
　ハンドオーバ制御装置１０００のコマンド受信部１４０は、ハンドオーバ判定装置２０００のコマンド送信部２５００が送信してくるハンドオーバ応答コマンド２５２と、ハンドオーバ拒否コマンド２６２と、ハンドオーバ抑止コマンド２７２と、ハンドオーバ抑止解除コマンド２８２と、を受信する。
　ハンドオーバ要求送信制限部１７０は、コマンド受信部１４０が受信したコマンドにハンドオーバ抑止コマンド２７２が含まれている場合は、ハンドオーバ要求送信部１３０を動作させない。
　さらに、ハンドオーバ要求送信制限部１７０は、コマンド受信部１４０が受信したコマンドにハンドオーバ抑止解除コマンド２８２が含まれている場合は、ハンドオーバ要求送信部１３０を動作させる。 The command reception unit 140 of the handover control apparatus 1000 includes a handover response command 252, a handover rejection command 262, a handover suppression command 272, a handover suppression release command 282, which are transmitted from the command transmission unit 2500 of the handover determination apparatus 2000. Receive.
The handover request transmission restriction unit 170 does not operate the handover request transmission unit 130 when the command received by the command reception unit 140 includes the handover suppression command 272.
Further, when the command received by the command receiving unit 140 includes the handover suppression release command 282, the handover request transmission limiting unit 170 operates the handover request transmitting unit 130.
　＜ハンドオーバ判定装置２０００の動作＞
　第２の実施形態に係るハンドオーバ判定装置２０００の動作について、図７を参照して説明する。図７は、第２の実施形態に係るハンドオーバ判定装置２０００の動作を示す流れ図である。なお、以下では、ＳＲＶＣＣおよび呼の状態が呼び出し中状態でもハンドオーバが可能なａＳＲＶＣＣ対応の端末機である移動端末機３０が音声呼を取得し（音声通話を行い）、音声呼の状態と移動端末機情報とに基づき、ハンドオーバ可能か否かを判定する場合について説明する。
　図７に示すように、先ず、ステップＳ２００２では、ハンドオーバ要求受信部２１０が、ハンドオーバ要求送信部１３０から送信されたハンドオーバ要求１３２に基づくＳＲＶＣＣ要求を受信するまで待機し、ハンドオーバ要求１３２に基づくＳＲＶＣＣ要求を受信したらステップＳ２００４に移行する。 <Operation of Handover Determination Device 2000>
The operation of the handover determination apparatus 2000 according to the second embodiment will be described with reference to FIG. FIG. 7 is a flowchart showing the operation of the handover determination device 2000 according to the second embodiment. In the following description, the mobile terminal 30 which is an aSRVCC compatible terminal capable of handover even when the SRVCC and the call state are ringing acquires a voice call (performs a voice call), and the voice call state and the mobile terminal A case where it is determined whether or not handover is possible based on the machine information will be described.
As shown in FIG. 7, first, in step S2002, the handover request receiving unit 210 waits until it receives an SRVCC request based on the handover request 132 transmitted from the handover request transmitting unit 130, and the SRVCC request based on the handover request 132 is received. Is received, the process proceeds to step S2004.
　ステップＳ２００４では、移動端末機情報取得部２３０が、移動端末機３０がその音声呼の状態が呼び出し中状態でもハンドオーバが可能なａＳＲＶＣＣ対応の端末機であるか否かの移動端末機情報を移動端末機情報管理装置８０から取得する。その後、処理をステップＳ２００６に移行する。なお、移動端末機情報取得部２３０が、移動端末機３０の移動端末機情報を移動端末機情報管理装置８０から既に取得している場合は、ステップＳ２００４の処理は行わなくてもよい。
　ステップＳ２００６では、呼状態取得部２２０が、移動端末機３０の音声呼の状態が、発信中状態か呼び出し中状態か着信中状態か通話中状態か割込通話中状態かの何れの状態にあるかを、移動端末機３０の音声呼の状態を監視している呼制御装置７０から取得する。その後、処理をステップＳ２００８に移行する。 In step S2004, the mobile terminal information acquisition unit 230 displays the mobile terminal information indicating whether or not the mobile terminal 30 is an aSRVCC compatible terminal capable of performing handover even when the voice call state is ringing. Obtained from the machine information management device 80. Thereafter, the process proceeds to step S2006. If the mobile terminal information acquisition unit 230 has already acquired the mobile terminal information of the mobile terminal 30 from the mobile terminal information management device 80, the process of step S2004 may not be performed.
In step S2006, the call state acquisition unit 220 is in a state where the voice call of the mobile terminal 30 is in a calling state, a ringing state, an incoming state, a call state, or an interrupt call state. Is obtained from the call control device 70 that monitors the state of the voice call of the mobile terminal 30. Thereafter, the process proceeds to step S2008.
　ステップＳ２００８では、ハンドオーバ判定部２４０を実行する。その後、処理をステップＳ２０１０に移行する。
　ステップＳ２０１０では、ハンドオーバ判定部２４０がハンドオーバ可能と判定した場合はステップＳ２０１２に移行する。一方、ステップＳ２０１０において、ハンドオーバ判定部２４０がハンドオーバ不可と判定した場合はステップＳ２０１４に移行する。
　ステップＳ２０１２では、コマンド送信部２５００を実行することにより、ＳＲＶＣＣ応答をＭＳＣ　Ｓｅｒｖｅｒ４４経由でＭＭＥ４２に送信する。ＭＭＥ４２は、ＳＲＶＣＣ応答に基づくハンドオーバ応答コマンド２５２をハンドオーバ制御装置１０００のコマンド受信部１４０に送信する。その後、処理をステップＳ２００２に移行する。 In step S2008, the handover determination unit 240 is executed. Thereafter, the process proceeds to step S2010.
In step S2010, if the handover determining unit 240 determines that a handover is possible, the process proceeds to step S2012. On the other hand, when the handover determination unit 240 determines that the handover is not possible in step S2010, the process proceeds to step S2014.
In step S2012, by executing the command transmission unit 2500, an SRVCC response is transmitted to the MME 42 via the MSC Server 44. The MME 42 transmits a handover response command 252 based on the SRVCC response to the command receiving unit 140 of the handover control apparatus 1000. Thereafter, the process proceeds to step S2002.
　一方、ステップＳ２０１４では、コマンド送信部２５００を実行することにより、ＳＲＶＣＣ拒否をＭＳＣ　Ｓｅｒｖｅｒ４４経由でＭＭＥ４２に送信する。ＭＭＥ４２は、ＳＲＶＣＣ拒否に基づくハンドオーバ拒否コマンド２６２をハンドオーバ制御装置１０００のコマンド受信部１４０に送信する。その後、処理をステップＳ２０１６に移行する。
　ステップＳ２０１６では、コマンド送信部２５００を実行することにより、ＳＲＶＣＣ抑止をＭＳＣ　Ｓｅｒｖｅｒ４４経由でＭＭＥ４２に送信する。ＭＭＥ４２は、ＳＲＶＣＣ抑止に基づくハンドオーバ抑止コマンド２７２をハンドオーバ制御装置１０００のコマンド受信部１４０に送信する。その後、処理をステップＳ２０１８に移行する。 On the other hand, in step S2014, by executing the command transmission unit 2500, the SRVCC rejection is transmitted to the MME 42 via the MSC Server 44. The MME 42 transmits a handover rejection command 262 based on the SRVCC rejection to the command reception unit 140 of the handover control apparatus 1000. Thereafter, the process proceeds to step S2016.
In step S2016, the command transmission unit 2500 is executed to transmit the SRVCC suppression to the MME 42 via the MSC Server 44. The MME 42 transmits a handover suppression command 272 based on SRVCC suppression to the command reception unit 140 of the handover control apparatus 1000. Thereafter, the process proceeds to step S2018.
　ステップＳ２０１８では、呼状態取得部２２０が、移動端末機３０の音声呼の状態が、発信中状態か呼び出し中状態か着信中状態か通話中状態か割込通話中状態かの何れの状態にあるかを、移動端末機３０の音声呼の状態を監視している呼制御装置７０から取得する。その後、処理をステップＳ２０２０に移行する。
　ステップＳ２０２０では、ハンドオーバ判定部２４０を実行する。その後、処理をステップＳ２０２２に移行する。 In step S <b> 2018, the call state acquisition unit 220 has a voice call state of the mobile terminal 30 in any of a calling state, a ringing state, a receiving state, a calling state, or an interrupting call state. Is obtained from the call control device 70 that monitors the state of the voice call of the mobile terminal 30. Thereafter, the process proceeds to step S2020.
In step S2020, the handover determination unit 240 is executed. Thereafter, the process proceeds to step S2022.
　ステップＳ２０２２では、ハンドオーバ判定部２４０がハンドオーバ可能と判定した場合はステップＳ２０２４に移行する。一方、ステップＳ２０２２において、ハンドオーバ判定部２４０がハンドオーバ不可と判定した場合はステップＳ２０１８に移行する。
　ステップＳ２０２４では、コマンド送信部２５００を実行することにより、ＳＲＶＣＣ抑止解除をＭＳＣ　Ｓｅｒｖｅｒ４４経由でＭＭＥ４２に送信する。ＭＭＥ４２は、ＳＲＶＣＣ抑止解除に基づくハンドオーバ抑止解除コマンド２８２をハンドオーバ制御装置１０００のコマンド受信部１４０に送信する。その後、処理をステップＳ２００２に移行する。 In step S2022, when the handover determining unit 240 determines that a handover is possible, the process proceeds to step S2024. On the other hand, when the handover determination unit 240 determines that the handover is not possible in step S2022, the process proceeds to step S2018.
In step S2024, by executing the command transmission unit 2500, the SRVCC suppression release is transmitted to the MME 42 via the MSC Server 44. The MME 42 transmits a handover suppression cancellation command 282 based on the SRVCC suppression cancellation to the command reception unit 140 of the handover control apparatus 1000. Thereafter, the process proceeds to step S2002.
　＜ハンドオーバ制御装置１０００の動作＞
　第２の実施形態に係るハンドオーバ制御装置１０００の動作について、図８を参照して説明する。図８は、第２の実施形態に係るハンドオーバ制御装置１０００の動作を示す流れ図である。
　図８に示すように、先ず、ステップＳ１００２では、無線品質情報受信部１１０が無線品質情報３２を受信するまで待機し、受信したらステップＳ１００４に移行する。
　ステップＳ１００４では、無線品質判定部１２０が、無線品質情報３２に基づき、移動端末機３０の無線品質が劣化しているか否かを判定し、無線品質が劣化している場合はステップＳ１００６に移行する。一方、ステップＳ１００４において、無線品質が劣化していない場合はステップＳ１００２に移行する。 <Operation of handover control apparatus 1000>
The operation of the handover control apparatus 1000 according to the second embodiment will be described with reference to FIG. FIG. 8 is a flowchart showing the operation of the handover control apparatus 1000 according to the second embodiment.
As shown in FIG. 8, first, in step S1002, the process waits until the wireless quality information receiving unit 110 receives the wireless quality information 32. If received, the process proceeds to step S1004.
In step S1004, the radio quality determination unit 120 determines whether the radio quality of the mobile terminal 30 is deteriorated based on the radio quality information 32. If the radio quality is deteriorated, the process proceeds to step S1006. . On the other hand, if the wireless quality is not degraded in step S1004, the process proceeds to step S1002.
　ステップＳ１００６では、ハンドオーバ要求送信部１３０が、ハンドオーバ要求１３２をＭＭＥ４２に送信する。ＭＭＥ４２は、ＭＳＣ　Ｓｅｒｖｅｒ４４経由でＳＲＶＣＣ要求をハンドオーバ要求受信部２１０に送信する。その後、処理をステップＳ１００８に移行する。
　ステップＳ１００８では、コマンド受信部１４０がコマンドを受信するまで待機し、コマンドを受信したらステップＳ１０１０に移行する。
　ステップＳ１０１０では、コマンド受信部１４０が受信したコマンドがハンドオーバ応答コマンド２５２であるか否か判定し、ハンドオーバ応答コマンド２５２である場合はステップＳ１０１２に移行する。一方、ステップＳ１０１０において、ハンドオーバ応答コマンド２５２ではない場合はステップＳ１０１４に移行する。 In step S1006, the handover request transmitter 130 transmits a handover request 132 to the MME 42. The MME 42 transmits the SRVCC request to the handover request receiving unit 210 via the MSC Server 44. Thereafter, the process proceeds to step S1008.
In step S1008, the process waits until the command receiving unit 140 receives a command. When a command is received, the process proceeds to step S1010.
In step S1010, it is determined whether the command received by the command receiver 140 is a handover response command 252. If the command is a handover response command 252, the process proceeds to step S1012. On the other hand, if it is not the handover response command 252 in step S1010, the process proceeds to step S1014.
　ステップＳ１０１２では、ハンドオーバ応答部１５０を実行し、移動端末機３０にハンドオーバ指示１５２を送信する。その後、処理をステップＳ１００２に移行する。
　一方、ステップＳ１０１４では、コマンド受信部１４０が受信したコマンドがハンドオーバ抑止コマンド２７２であるか否か判定し、ハンドオーバ抑止コマンド２７２である場合はステップＳ１００８に移行する（つまり、ハンドオーバ要求送信部１３０を動作させない）。一方、ステップＳ１０１４において、ハンドオーバ抑止コマンド２７２ではない場合はステップＳ１０１６に移行する。 In step S1012, the handover response unit 150 is executed, and a handover instruction 152 is transmitted to the mobile terminal 30. Thereafter, the process proceeds to step S1002.
On the other hand, in step S1014, it is determined whether or not the command received by the command receiving unit 140 is a handover suppression command 272. If the command is the handover suppression command 272, the process proceeds to step S1008 (that is, the handover request transmitting unit 130 is operated). Don't let me) On the other hand, if it is not the handover inhibition command 272 in step S1014, the process proceeds to step S1016.
　さらに、ステップＳ１０１６では、コマンド受信部１４０が受信したコマンドがハンドオーバ抑止解除コマンド２８２であるか否か判定し、ハンドオーバ抑止解除コマンド２８２である場合はステップＳ１００２に移行する（つまり、ハンドオーバ要求送信部１３０を動作させる）。一方、ステップＳ１０１６において、ハンドオーバ抑止解除コマンド２８２ではない（つまり、ハンドオーバ拒否コマンド２６２である）場合はステップＳ１０１８に移行する。
　一方、ステップＳ１０１８では、ハンドオーバ拒否部１６０を実行し、移動端末機３０にハンドオーバを実施させるためのハンドオーバ指示１５２を送信しない。その後、処理をステップＳ１００２に移行する。
　なお、ステップＳ１０１４とステップＳ１０１６の動作が、ハンドオーバ要求送信制限部１７０の動作である。 Further, in step S1016, it is determined whether or not the command received by the command receiver 140 is a handover suppression release command 282. If the command is a handover suppression release command 282, the process proceeds to step S1002 (that is, the handover request transmitter 130). To work). On the other hand, in step S1016, if it is not the handover suppression release command 282 (that is, the handover rejection command 262), the process proceeds to step S1018.
Meanwhile, in step S1018, the handover rejection unit 160 is executed, and the handover instruction 152 for causing the mobile terminal 30 to perform the handover is not transmitted. Thereafter, the process proceeds to step S1002.
Note that the operations in steps S1014 and S1016 are operations of the handover request transmission restriction unit 170.
＜ハンドオーバ判定装置２０００及びハンドオーバ制御装置１０００の動作＞
　第２の実施形態に係るハンドオーバ制御装置１０００の動作について、図９及び図７，８を参照して説明する。図９は、第２の実施形態に係るハンドオーバ判定装置２０００及びハンドオーバ制御装置１０００の動作を示すシーケンス図である。 <Operations of Handover Determination Device 2000 and Handover Control Device 1000>
The operation of the handover control apparatus 1000 according to the second embodiment will be described with reference to FIG. 9 and FIGS. FIG. 9 is a sequence diagram illustrating operations of the handover determination device 2000 and the handover control device 1000 according to the second embodiment.
　＜発信中状態の動作＞
　移動端末機３０は、呼の状態が呼び出し中状態でもハンドオーバが可能なａＳＲＶＣＣ対応の移動端末機であり、ＬＴＥ網１０のサービスエリアの境界付近かつ３Ｇ網２０のサービスエリアの中にいるものとし（図１（Ｂ）参照）、ＬＴＥ網１０の基地局機器４０と通信しているものとして説明する。図９では、移動端末機３０は、時点ｔ０において、音声通話のためのベアラ（bearer）が確立される前の状態（発信前）とする。なお、以下では、移動端末機３０が音声呼を取得し（音声通話を行い）、音声呼の状態と移動端末機情報とに基づき、ハンドオーバ可能か否かを判定する場合について説明する。 <Operation during outgoing call>
The mobile terminal 30 is an aSRVCC compatible mobile terminal capable of performing handover even when the call state is ringing, and is assumed to be in the vicinity of the service area boundary of the LTE network 10 and within the service area of the 3G network 20 ( 1 (B)), it demonstrates as what is communicating with the base station apparatus 40 of the LTE network 10. FIG. In FIG. 9, the mobile terminal 30 is in a state (before transmission) before a bearer for a voice call is established at time t0. Hereinafter, a case will be described in which the mobile terminal 30 acquires a voice call (performs a voice call) and determines whether or not handover is possible based on the voice call state and the mobile terminal information.
　移動端末機３０を持ったユーザが発信操作することにより、相手側移動端末機と音声通話をするための発信が開始される。発信を開始するとともに、移動端末機３０を持ったユーザがＬＴＥ網１０から３Ｇ網２０のサービスエリア付近（図１（Ｂ）参照）に移動したとする。移動端末機３０は、ＬＴＥ網１０の端部付近に移動したため、ＬＴＥ網１０からの無線品質が劣化してくる。そのため、時点ｔ１で、移動端末機３０は、現在の無線品質が基地局機器４０から指定された無線品質の閾値を下回ったことを示す無線品質情報３２を基地局機器４０に送信する。 When a user having the mobile terminal 30 performs a call operation, a call for making a voice call with the partner mobile terminal is started. It is assumed that a user having a mobile terminal 30 moves from the LTE network 10 to the vicinity of the service area of the 3G network 20 (see FIG. 1B) while starting transmission. Since the mobile terminal 30 has moved to the vicinity of the end of the LTE network 10, the radio quality from the LTE network 10 deteriorates. Therefore, the mobile terminal 30 transmits to the base station device 40 the wireless quality information 32 indicating that the current wireless quality has fallen below the threshold value of the wireless quality specified by the base station device 40 at time t1.
　基地局機器４０に含まれるハンドオーバ制御装置１０００の無線品質情報受信部１１０は、無線品質情報３２を受信する（図８のステップＳ１００２）。次に、無線品質判定部１２０は、無線品質情報３２に基づき、移動端末機３０の無線品質が劣化していると判定する（図８のステップＳ１００４）。
　時点ｔ２で、ハンドオーバ要求送信部１３０は、ハンドオーバ要求１３２をＭＭＥ４２に送信する。ＭＭＥ４２は、ＭＳＣ　Ｓｅｒｖｅｒ４４経由でＳＲＶＣＣ要求をハンドオーバ要求受信部２１０に送信する（図８のステップＳ１００６）。
　ハンドオーバ要求受信部２１０は、ハンドオーバ要求１３２に基づくＳＲＶＣＣ要求を受信する（図７のステップＳ２００２）。 The radio quality information receiving unit 110 of the handover control apparatus 1000 included in the base station device 40 receives the radio quality information 32 (step S1002 in FIG. 8). Next, the wireless quality determination unit 120 determines that the wireless quality of the mobile terminal 30 has deteriorated based on the wireless quality information 32 (step S1004 in FIG. 8).
At time t2, the handover request transmission unit 130 transmits a handover request 132 to the MME 42. The MME 42 transmits the SRVCC request to the handover request receiving unit 210 via the MSC Server 44 (Step S1006 in FIG. 8).
The handover request receiving unit 210 receives the SRVCC request based on the handover request 132 (step S2002 in FIG. 7).
　移動端末機情報取得部２３０は、移動端末機３０がその音声呼の状態が呼び出し中状態でもハンドオーバが可能なａＳＲＶＣＣ対応の端末機であるか否かの移動端末機情報を移動端末機情報管理装置８０から取得する（図７のステップＳ２００４）。また、呼状態取得部２２０は、移動端末機３０の音声呼の状態が発信中状態であることを取得する（図７のステップＳ２００６）。ハンドオーバ判定部２４０は、移動端末機３０の音声呼の状態が発信中状態であるので、ハンドオーバ不可と判定する（図７のステップＳ２００８）。 The mobile terminal information acquisition unit 230 stores mobile terminal information indicating whether or not the mobile terminal 30 is an aSRVCC compatible terminal that can be handed over even when the voice call is ringing. 80 (step S2004 in FIG. 7). In addition, the call state acquisition unit 220 acquires that the voice call state of the mobile terminal 30 is a calling state (step S2006 in FIG. 7). The handover determination unit 240 determines that the handover is not possible because the voice call state of the mobile terminal 30 is a calling state (step S2008 in FIG. 7).
　時点ｔ３で、コマンド送信部２５００を実行することにより、ＳＲＶＣＣ拒否をＭＳＣ　Ｓｅｒｖｅｒ４４経由でＭＭＥ４２に送信する。ＭＭＥ４２は、ＳＲＶＣＣ拒否に基づくハンドオーバ拒否コマンド２６２をハンドオーバ制御装置１０００のコマンド受信部１４０に送信する（図７のステップＳ２０１４）。さらに、コマンド送信部２５００を実行することにより、ＳＲＶＣＣ抑止をＭＳＣ　Ｓｅｒｖｅｒ４４経由でＭＭＥ４２に送信する。ＭＭＥ４２は、ＳＲＶＣＣ抑止に基づくハンドオーバ抑止コマンド２７２をハンドオーバ制御装置１０００のコマンド受信部１４０に送信する（図７のステップＳ２０１６）。ハンドオーバ判定装置２０００は、ハンドオーバ抑止コマンド２７２をＳＲＶＣＣ抑止を介して送信後、呼状態取得部２２０により移動端末機３０の音声呼の状態を監視し、ハンドオーバ判定部２４０がハンドオーバ可能と判定するまで待機する（図７のステップＳ２０１８～Ｓ２０２２）。 At time t3, the SRVCC rejection is transmitted to the MME 42 via the MSC Server 44 by executing the command transmission unit 2500. The MME 42 transmits a handover rejection command 262 based on the SRVCC rejection to the command receiving unit 140 of the handover control apparatus 1000 (step S2014 in FIG. 7). Further, by executing the command transmission unit 2500, the SRVCC suppression is transmitted to the MME 42 via the MSC Server 44. The MME 42 transmits a handover suppression command 272 based on SRVCC suppression to the command receiving unit 140 of the handover control apparatus 1000 (step S2016 in FIG. 7). The handover determination device 2000 transmits a handover suppression command 272 via SRVCC suppression, then monitors the voice call state of the mobile terminal 30 by the call state acquisition unit 220 and waits until the handover determination unit 240 determines that the handover is possible. (Steps S2018 to S2022 in FIG. 7).
　ハンドオーバ制御装置１０００は、ハンドオーバ抑止コマンド２７２を受信したので（図８のステップＳ１０１４）、ハンドオーバ判定装置２０００からのコマンド（ハンドオーバ抑止解除コマンド２８２）を受信するまで待機する（図８のステップＳ１００８）。
　次に、時点ｔ４で、移動端末機３０は、現在の無線品質が基地局機器４０から指定された無線品質の閾値を下回っていることを示す無線品質情報３２を基地局機器４０に送信する。しかしながら、ハンドオーバ制御装置１０００は、ハンドオーバ判定装置２０００からのコマンド（ハンドオーバ抑止解除コマンド２８２）を受信するまでハンドオーバ要求送信部１３０は動作しないので、ハンドオーバ要求１３２の送信は抑止されている。 Since the handover control apparatus 1000 has received the handover suppression command 272 (step S1014 in FIG. 8), the handover control apparatus 1000 waits until it receives a command (handover suppression cancellation command 282) from the handover determination apparatus 2000 (step S1008 in FIG. 8).
Next, at time t <b> 4, the mobile terminal 30 transmits to the base station device 40 the wireless quality information 32 indicating that the current wireless quality is below the wireless quality threshold specified by the base station device 40. However, since the handover request transmission unit 130 does not operate until the handover control apparatus 1000 receives a command (handover suppression release command 282) from the handover determination apparatus 2000, transmission of the handover request 132 is suppressed.
　＜呼び出し中状態の動作＞
　時点ｔ５で、移動端末機３０の音声呼の状態が呼び出し中状態に遷移する。ハンドオーバ判定装置２０００は、移動端末機３０の音声呼の状態が呼び出し中状態に遷移したので、ハンドオーバ判定部２４０がハンドオーバ可能と判定する（図７のステップＳ２０２２）。
　時点ｔ６で、ハンドオーバ判定装置２０００は、ＳＲＶＣＣ抑止解除をＭＳＣ　Ｓｅｒｖｅｒ４４経由でＭＭＥ４２に送信する。ＭＭＥ４２は、ＳＲＶＣＣ抑止解除に基づくハンドオーバ抑止解除コマンド２８２をハンドオーバ制御装置１０００のコマンド受信部１４０に送信する（図７のステップＳ２０２４）。ハンドオーバ制御装置１０００は、ハンドオーバ抑止解除コマンド２８２を受信したので（図８のステップＳ１０１６）、ハンドオーバ要求送信部１３０は動作するようになり、ハンドオーバ要求１３２の送信の抑止が解除される。 <Operation in calling state>
At time t5, the state of the voice call of the mobile terminal 30 changes to the ringing state. The handover determination device 2000 determines that the handover determination unit 240 can perform the handover because the voice call state of the mobile terminal 30 has changed to the ringing state (step S2022 in FIG. 7).
At time t <b> 6, the handover determination device 2000 transmits SRVCC suppression release to the MME 42 via the MSC Server 44. The MME 42 transmits a handover suppression cancellation command 282 based on the SRVCC suppression cancellation to the command reception unit 140 of the handover control apparatus 1000 (step S2024 in FIG. 7). Since the handover control apparatus 1000 receives the handover suppression release command 282 (step S1016 in FIG. 8), the handover request transmission unit 130 starts operating, and the suppression of transmission of the handover request 132 is released.
　時点ｔ７で、移動端末機３０は、現在の無線品質が基地局機器４０から指定された無線品質の閾値を下回っていることを示す無線品質情報３２を基地局機器４０に送信する。
　ハンドオーバ制御装置１０００の無線品質情報受信部１１０は、無線品質情報３２を受信する（図８のステップＳ１００２）。次に、無線品質判定部１２０は、無線品質情報３２に基づき、移動端末機３０の無線品質が劣化していると判定する（図８のステップＳ１００４）。 At time t <b> 7, the mobile terminal 30 transmits to the base station device 40 the wireless quality information 32 indicating that the current wireless quality is below the wireless quality threshold specified by the base station device 40.
The radio quality information receiving unit 110 of the handover control apparatus 1000 receives the radio quality information 32 (step S1002 in FIG. 8). Next, the wireless quality determination unit 120 determines that the wireless quality of the mobile terminal 30 has deteriorated based on the wireless quality information 32 (step S1004 in FIG. 8).
　時点ｔ８で、ハンドオーバ要求送信部１３０は、ハンドオーバ要求１３２をＭＭＥ４２に送信する。ＭＭＥ４２は、ＭＳＣ　Ｓｅｒｖｅｒ４４経由でＳＲＶＣＣ要求をハンドオーバ要求受信部２１０に送信する（図８のステップＳ１００６）。次に、ハンドオーバ要求受信部２１０は、ハンドオーバ要求１３２に基づくＳＲＶＣＣ要求を受信する（図７のステップＳ２００２）。呼状態取得部２２０は、移動端末機３０の音声呼の状態が呼び出し中状態であることを取得する（図７のステップＳ２００６）。ハンドオーバ判定部２４０は、移動端末機３０の音声呼の状態が呼び出し中状態で移動端末機３０の移動端末機情報がａＳＲＶＣＣ対応の端末機であるので、ハンドオーバ可能と判定する（図７のステップＳ２００８）。 At time t8, the handover request transmitter 130 transmits a handover request 132 to the MME 42. The MME 42 transmits the SRVCC request to the handover request receiving unit 210 via the MSC Server 44 (Step S1006 in FIG. 8). Next, the handover request receiving unit 210 receives an SRVCC request based on the handover request 132 (step S2002 in FIG. 7). The call state acquisition unit 220 acquires that the voice call state of the mobile terminal 30 is a ringing state (step S2006 in FIG. 7). The handover determination unit 240 determines that the handover is possible because the voice call state of the mobile terminal 30 is in the ringing state and the mobile terminal information of the mobile terminal 30 is an aSRVCC compatible terminal (step S2008 in FIG. 7). ).
　時点ｔ９で、コマンド送信部２５００を実行することにより、ＳＲＶＣＣ応答をＭＳＣ　Ｓｅｒｖｅｒ４４経由でＭＭＥ４２に送信する。ＭＭＥ４２は、ＳＲＶＣＣ応答に基づくハンドオーバ応答コマンド２５２をハンドオーバ制御装置１０００のコマンド受信部１４０に送信する（図７のステップＳ２０１２）。
　時点ｔ１０で、ハンドオーバ制御装置１００は、ハンドオーバ応答部１５０を実行し、移動端末機３０にハンドオーバを実施させるためのハンドオーバ指示１５２を送信する（図８のステップＳ１０１２）。
　時点ｔ１１で、移動端末機３０は、ハンドオーバを実行する。移動端末機３０は、ＬＴＥ網１０から３Ｇ網２０にハンドオーバされ（図１（Ｂ）参照）、時点ｔ１２で３Ｇネットワーク６０による通話中状態に切り替わったことを示している。つまり、ＳＲＶＣＣが動作したことを示している。 By executing the command transmission unit 2500 at time t9, the SRVCC response is transmitted to the MME 42 via the MSC Server 44. The MME 42 transmits a handover response command 252 based on the SRVCC response to the command receiving unit 140 of the handover control apparatus 1000 (step S2012 in FIG. 7).
At time t10, the handover control apparatus 100 executes the handover response unit 150 and transmits a handover instruction 152 for causing the mobile terminal 30 to perform handover (step S1012 in FIG. 8).
At time t11, the mobile terminal 30 executes a handover. The mobile terminal 30 has been handed over from the LTE network 10 to the 3G network 20 (see FIG. 1B), and has switched to a busy state by the 3G network 60 at time t12. That is, it indicates that SRVCC has been operated.
　以上に述べた第２の実施形態によれば、以下の効果が得られる。
　第２の実施形態では、移動端末機の呼の状態と、移動端末機の呼の状態が呼び出し中状態でもハンドオーバが可能な移動端末機であるか否かの移動端末機情報と、ハンドオーバができるか否かを判定するハンドオーバ判定装置からのコマンドに基づきハンドオーバを制御でき、ハンドオーバができない期間はハンドオーバ判定装置からのコマンドに基づきハンドオーバ要求の送信を抑止することができるので、ＳＲＶＣＣの規定に対応していない呼の状態で移動端末機３０をハンドオーバさせてしまうことによる移動端末機３０の呼切断と、移動端末機３０とＩＭＳネットワーク５０との間の状態不一致を防ぐことができ、さらに不要なハンドオーバ要求１３２の送信を抑止させることにより、基地局機器４０とＩＭＳネットワーク５０間の無駄なトラヒックを削減することができる。 According to the second embodiment described above, the following effects can be obtained.
In the second embodiment, the mobile terminal information can be handed over with the call state of the mobile terminal, the mobile terminal information indicating whether or not the mobile terminal can be handed over even when the call state of the mobile terminal is ringing. It is possible to control handover based on a command from a handover determination device that determines whether or not, and during a period when handover is not possible, transmission of a handover request can be suppressed based on a command from the handover determination device. It is possible to prevent call disconnection of the mobile terminal 30 due to handover of the mobile terminal 30 in a state of a call that has not been made, and state mismatch between the mobile terminal 30 and the IMS network 50, and unnecessary handover By suppressing the transmission of the request 132, the base station device 40 and the IMS network 50 are It is possible to reduce the spoiled traffic.
　（変形例３）
　第２の実施形態では、移動端末機３０は、その呼の状態が呼び出し中状態でもハンドオーバが可能なａＳＲＶＣＣ対応の端末機であるものとして説明したが、ａＳＲＶＣＣ非対応の端末機についても同様に説明できる。なお、本変形例３におけるａＳＲＶＣＣ非対応の端末機とは、本変形例１と同様に、ＳＲＶＣＣには対応しているがａＳＲＶＣＣには非対応の端末機を示す。移動端末機３０がａＳＲＶＣＣ非対応の端末機の場合は、発信中状態および呼び出し中状態においては、図９の時点t０と同様の処理を行う。通話中状態（呼が確立された後のガイダンス中状態を含む）においては、図９の時点ｔ５と同様の処理を行う。 (Modification 3)
In the second embodiment, the mobile terminal 30 is described as an aSRVCC compatible terminal capable of performing handover even when the call state is ringing. However, the mobile terminal 30 is similarly described for an aSRVCC non-compatible terminal. it can. Note that a terminal that does not support aSRVCC in the third modification indicates a terminal that supports SRVCC but does not support aSRVCC, as in the first modification. When the mobile terminal 30 is a terminal that does not support aSRVCC, the same processing as that at time t0 in FIG. 9 is performed in the calling state and the calling state. In a busy state (including a busy state after the call is established), the same processing as at time t5 in FIG. 9 is performed.
　図９において、時点ｔ５の「呼び出し中」を「音声通話中」と読み替えて本変形例３の構成を説明する。図９の時点ｔ８で、ハンドオーバ要求１３２に基づくＳＲＶＣＣ要求を受信すると、ハンドオーバ判定部２４０は、移動端末機３０の音声呼の状態が通話中状態であるので、ハンドオーバ可能と判定する（図７のステップＳ２００８）。時点ｔ８以降は、第２の実施形態と同様である。
　また、移動端末機３０の音声呼の状態が、発信中状態か呼び出し中状態か着信中状態か通話中状態か割込通話中状態かの何れかの状態として説明したが、音声ガイダンスに繋がったガイダンス中状態や切断中状態を含めてもよい。なお、本変形例３で説明するａＳＲＶＣＣ非対応の移動端末機３０は、呼が確立される前のガイダンス中状態や切断中状態のハンドオーバに対応していない。このため、ハンドオーバ判定部２４０は、移動端末機３０の呼の状態が呼が確立される前のガイダンス中状態や切断中状態の場合、ハンドオーバ不可と判定すればよい。また、この場合、変形例１と同様に、ハンドオーバ判定部２４０がハンドオーバ不可と判定する動作以外の他の動作が規定されてもよい。 In FIG. 9, the configuration of the third modification will be described by replacing “calling” at time t5 with “voice call in progress”. When the SRVCC request based on the handover request 132 is received at time t8 in FIG. 9, the handover determining unit 240 determines that the handover is possible because the state of the voice call of the mobile terminal 30 is a busy state (FIG. 7). Step S2008). After time t8, the process is the same as in the second embodiment.
In addition, the state of the voice call of the mobile terminal 30 has been described as one of a calling state, a ringing state, an incoming call state, a call state, or an interrupt call state, but this has led to a voice guidance. A state during guidance or a state during disconnection may be included. Note that the aSRVCC incompatible mobile terminal 30 described in the third modification does not support a handover in a guidance state or a disconnection state before a call is established. For this reason, the handover determining unit 240 may determine that the handover is not possible when the call state of the mobile terminal 30 is a guidance state or a disconnection state before the call is established. In this case, similarly to the first modification, other operations than the operation in which the handover determining unit 240 determines that the handover is impossible may be defined.
　（変形例４）
　第２の実施形態では、移動端末機３０は、その呼の状態が呼び出し中状態でもハンドオーバが可能なａＳＲＶＣＣ対応の端末機であるものとして説明し、変形例３では、移動端末機３０は、ａＳＲＶＣＣ非対応の端末機であるものとして説明したが、ｂＳＲＶＣＣ対応の端末機についても同様に説明できる。本変形例４では、移動端末機３０は、その呼の状態が呼が確立する前の状態で送出されるガイダンス中状態でもハンドオーバが可能なｂＳＲＶＣＣ対応の端末機であるものとして説明する。なお、本変形例４におけるｂＳＲＶＣＣ対応の端末機とは、ＳＲＶＣＣ、ａＳＲＶＣＣ、およびｂＳＲＶＣＣに対応の端末機を示す。 (Modification 4)
In the second embodiment, the mobile terminal 30 is described as an aSRVCC compatible terminal capable of performing handover even when the call state is ringing. In the third modification, the mobile terminal 30 Although described as a non-compatible terminal, a bSRVCC compatible terminal can be similarly described. In the fourth modification, the mobile terminal 30 will be described as a bSRVCC compatible terminal capable of performing handover even when the call state is in a guidance state that is transmitted in a state before the call is established. In addition, the terminal corresponding to bSRVCC in Modification 4 refers to a terminal compatible with SRVCC, aSRVCC, and bSRVCC.
　移動端末機３０がｂＳＲＶＣＣ対応の端末機の場合、発信中状態においては、図９の時点t０と同様の処理を行う。呼が確立される前のガイダンス中状態、呼び出し中状態および通話中状態（呼が確立された後のガイダンス中状態を含む）においては、図９の時点ｔ５と同様の処理を行う。ここで、呼が確立される前のガイダンス中状態での動作はｂＳＲＶＣＣとして起動可能であり、呼び出し中状態での動作はａＳＲＶＣＣとして起動可能であり、通話中状態（呼が確立された後のガイダンス中状態を含む）での動作はＳＲＶＣＣとして起動可能である。 If the mobile terminal 30 is a bSRVCC compatible terminal, the same processing as at time t0 in FIG. In the in-guidance state before the call is established, the in-calling state, and the in-call state (including the in-guidance state after the call is established), processing similar to that at time t5 in FIG. 9 is performed. Here, the operation in the guidance state before the call is established can be activated as bSRVCC, the operation in the ringing state can be activated as aSRVCC, and the busy state (guidance after the call is established) The operation in the middle state can be started as SRVCC.
　図９において、時点ｔ５の「呼び出し中」を「呼が確立される前のガイダンス中」と読み替えて変形例４の構成を説明する。図９の時点ｔ８で、ハンドオーバ要求１３２に基づくＳＲＶＣＣ要求を受信すると、ハンドオーバ判定部２４０は、移動端末機３０の音声呼の状態が呼が確立される前のガイダンス中状態であるので、ハンドオーバ可能と判定する（図７のステップＳ２００８）。時点ｔ８以降は、第２の実施形態と同様である。 In FIG. 9, the configuration of Modification 4 will be described by replacing “calling” at time t <b> 5 with “guidance before the call is established”. When the SRVCC request based on the handover request 132 is received at time t8 in FIG. 9, the handover determination unit 240 can perform handover because the voice call state of the mobile terminal 30 is in the guidance state before the call is established. (Step S2008 in FIG. 7). After time t8, the process is the same as in the second embodiment.
　（変形例５）
　第１及び第２の実施形態では、図１（Ｂ）に示すように、ＬＴＥ網１０のサービスエリアが３Ｇ網２０のサービスエリアに含まれている場合を説明したが、図１０に示すように、ＬＴＥ網１０のサービスエリアの一部と３Ｇ網２０のサービスエリアの一部とが重なっている場合でもよい。また、第１及び第２の実施形態では、ハンドオーバ制御装置１００または１０００が基地局機器４０にある場合を説明したが、ＭＭＥ４２やＭＳＣ　Ｓｅｒｖｅｒ４４に置くことも可能である。また、第１及び第２の実施形態では、ハンドオーバ判定装置２００または２０００がＩＭＳネットワーク５０にある場合を説明したが、ＭＭＥ４２やＭＳＣ　Ｓｅｒｖｅｒ４４に置くことも可能である。 (Modification 5)
In the first and second embodiments, the case where the service area of the LTE network 10 is included in the service area of the 3G network 20 as illustrated in FIG. 1B has been described, but as illustrated in FIG. A part of the service area of the LTE network 10 and a part of the service area of the 3G network 20 may overlap. In the first and second embodiments, the case where the handover control apparatus 100 or 1000 is in the base station device 40 has been described. However, the handover control apparatus 100 or 1000 may be placed in the MME 42 or the MSC Server 44. In the first and second embodiments, the case where the handover determination device 200 or 2000 is in the IMS network 50 has been described. However, the handover determination device 200 or 2000 may be placed in the MME 42 or the MSC Server 44.
　＜ハンドオーバ判定方法＞
　上述したハンドオーバ判定装置では、以下のようなハンドオーバ判定方法が採用されている。すなわち、第１のネットワーク通信網と前記第１のネットワーク通信網と共通のサービスエリアを有する第２のネットワーク通信網とで音声通話またはビデオ通話による通話が可能な移動端末機をハンドオーバさせる要求をハンドオーバ制御装置から受信するハンドオーバ判定方法であって、前記第１のネットワーク通信網で音声通話またはビデオ通話による通話中に前記移動端末機の無線品質の劣化を検出した場合に、前記移動端末機を前記第１のネットワーク通信網から前記第２のネットワーク通信網にハンドオーバさせて通話を継続させるためのハンドオーバ要求または前記ハンドオーバ要求に基づく要求を前記ハンドオーバ制御装置から受信するハンドオーバ要求受信工程と、前記ハンドオーバ要求受信工程が前記ハンドオーバ要求または前記ハンドオーバ要求に基づく要求を受信した場合、前記移動端末機の呼の状態を取得する呼状態取得工程と、前記移動端末機が、前記呼の状態において前記ハンドオーバが可能な移動端末機であるか否かの情報を含む移動端末機情報を取得する移動端末機情報取得工程と、前記呼状態取得工程が取得した前記呼の状態と前記移動端末機情報取得工程が取得した前記移動端末機情報とに基づき、前記呼の状態において前記ハンドオーバが可能な移動端末機ではない場合は、ハンドオーバ不可と判定し、前記呼の状態において前記ハンドオーバが可能な移動端末機である場合は、ハンドオーバ可能と判定するハンドオーバ判定工程と、前記ハンドオーバ判定工程がハンドオーバ不可と判定した場合は、前記ハンドオーバ制御装置に前記ハンドオーバを実施させないためのハンドオーバ拒否コマンドを送信し、前記ハンドオーバ判定工程がハンドオーバ可能と判定した場合は、前記ハンドオーバ制御装置に前記ハンドオーバを実施させるためのハンドオーバ応答コマンドを送信するコマンド送信工程と、を含むハンドオーバ判定方法が採用されている。 <Handover determination method>
The handover determination apparatus described above employs the following handover determination method. In other words, a request for handing over a mobile terminal capable of voice or video call between the first network communication network and the second network communication network having a common service area with the first network communication network is handed over. A handover determination method received from a control device, comprising: detecting a deterioration in radio quality of the mobile terminal during a voice call or video call in the first network communication network; A handover request receiving step of receiving a handover request or a request based on the handover request for handover from the first network communication network to the second network communication network to continue the call, and the handover request The reception process is the handover request Alternatively, when a request based on the handover request is received, a call state acquisition step of acquiring a call state of the mobile terminal, and the mobile terminal is a mobile terminal capable of the handover in the call state. A mobile terminal information acquisition step for acquiring mobile terminal information including information on whether or not there is, a call state acquired by the call state acquisition step, and the mobile terminal acquired by the mobile terminal information acquisition step Based on the information, if the mobile terminal is not capable of the handover in the call state, it is determined that the handover is not possible. If the mobile terminal is capable of the handover in the call state, the handover is possible. When the handover determining step and the handover determining step determine that the handover is impossible, the handover control apparatus A command transmission step for transmitting a handover response command for causing the handover control device to execute the handover when the handover determination step determines that handover is possible, Including handover determination method is adopted.
　なお、前記ハンドオーバ判定方法は、前記コマンド送信工程が、さらに、前記ハンドオーバ判定工程がハンドオーバ不可と判定した場合は、前記ハンドオーバ制御装置に前記ハンドオーバ要求の送信を抑止させるためのハンドオーバ抑止コマンドを前記ハンドオーバ拒否コマンドに付加して送信し、前記ハンドオーバ抑止コマンドを前記ハンドオーバ制御装置に送信後、前記ハンドオーバ判定工程がハンドオーバ可能と判定した場合、前記ハンドオーバ制御装置に前記ハンドオーバ要求の送信の抑止を解除させるためのハンドオーバ抑止解除コマンドを送信する、ようにしてもよい。 In the handover determination method, when the command transmission step further determines that the handover determination step determines that handover is not possible, a handover suppression command for causing the handover control apparatus to suppress transmission of the handover request is sent to the handover determination method. In order to cause the handover control device to cancel the suppression of the transmission of the handover request when the handover determination step determines that the handover is possible after transmitting the handover suppression command to the handover control device The handover suppression release command may be transmitted.
　＜ハンドオーバ制御方法＞
　上述したハンドオーバ制御装置では、以下のようなハンドオーバ制御方法が採用されている。すなわち、第１のネットワーク通信網と前記第１のネットワーク通信網と共通のサービスエリアを有する第２のネットワーク通信網とで音声通話またはビデオ通話による通話が可能な移動端末機をハンドオーバさせる要求をハンドオーバ判定装置に送信するハンドオーバ制御方法であって、前記第１のネットワーク通信網に在圏している前記移動端末機が送信する無線品質情報を受信する無線品質情報受信工程と、前記無線品質情報に基づき前記第１のネットワーク通信網での前記移動端末機の無線品質が劣化しているか否か判定する無線品質判定工程と、前記無線品質判定工程が前記移動端末機の無線品質が劣化したと判定した場合、前記移動端末機を前記第１のネットワーク通信網から前記第２のネットワーク通信網にハンドオーバさせて通話を継続させるためのハンドオーバ要求を前記ハンドオーバ判定装置に送信するハンドオーバ要求送信工程と、前記ハンドオーバ要求送信工程が送信した前記ハンドオーバ要求に対し前記ハンドオーバ判定装置から返信されてくるハンドオーバ応答コマンドを受信するコマンド受信工程と、前記コマンド受信工程が前記ハンドオーバを実施させるための前記ハンドオーバ応答コマンドを受信した場合は前記移動端末機に前記ハンドオーバを実施させるハンドオーバ指示を送るハンドオーバ応答工程と、前記コマンド受信工程が前記ハンドオーバを実施させないためのハンドオーバ拒否コマンドを受信した場合は前記移動端末機に前記ハンドオーバ指示を送信しないハンドオーバ拒否工程と、前記コマンド受信工程が前記ハンドオーバ要求の送信を抑止させるためのハンドオーバ抑止コマンドを受信した場合は前記ハンドオーバ要求送信工程を動作させず、前記コマンド受信工程が前記ハンドオーバ要求の送信の抑止を解除させるためのハンドオーバ抑止解除コマンドを受信した場合は前記ハンドオーバ要求送信工程を動作させるハンドオーバ要求送信制限工程と、を含むハンドオーバ制御方法が採用されている。 <Handover control method>
The handover control apparatus described above employs the following handover control method. In other words, a request for handing over a mobile terminal capable of voice or video call between the first network communication network and the second network communication network having a common service area with the first network communication network is handed over. A handover control method for transmitting to a determination device, comprising: a radio quality information receiving step for receiving radio quality information transmitted by the mobile terminal residing in the first network communication network; and the radio quality information A wireless quality determination step for determining whether or not the wireless quality of the mobile terminal in the first network communication network is deteriorated, and the wireless quality determination step determines that the wireless quality of the mobile terminal has deteriorated The mobile terminal is handed over from the first network communication network to the second network communication network. A handover request transmission step of transmitting a handover request for continuing a call to the handover determination device; and a handover response command returned from the handover determination device in response to the handover request transmitted by the handover request transmission step A command receiving step, a handover response step of sending a handover instruction for causing the mobile terminal to execute the handover when the command receiving step receives the handover response command for causing the handover to be performed, and the command receiving step. When a handover reject command for not performing the handover is received, a handover reject step that does not transmit the handover instruction to the mobile terminal, and the command reception step includes the handover request When a handover suppression command for suppressing transmission is received, the handover request transmission step is not operated, and when the command reception step receives a handover suppression cancellation command for canceling suppression of transmission of the handover request A handover control method including a handover request transmission restriction step for operating the handover request transmission step is employed.
　＜ハンドオーバ判定プログラム＞
　また、ＩＭＳネットワークにおいてプログラムを実行することによって、上述したハンドオーバ判定装置を実現する場合、以下のプログラムを用いることができる。すなわち、第１のネットワーク通信網と前記第１のネットワーク通信網と共通のサービスエリアを有する第２のネットワーク通信網とで音声通話またはビデオ通話による通話が可能な移動端末機をハンドオーバさせる要求をハンドオーバ制御装置から受信するハンドオーバ判定プログラムであって、コンピュータに、前記第１のネットワーク通信網で音声通話またはビデオ通話による通話中に前記移動端末機の無線品質の劣化を検出した場合に、前記移動端末機を前記第１のネットワーク通信網から前記第２のネットワーク通信網にハンドオーバさせて通話を継続させるためのハンドオーバ要求または前記ハンドオーバ要求に基づく要求を前記ハンドオーバ制御装置から受信するハンドオーバ要求受信ステップと、前記ハンドオーバ要求受信ステップが前記ハンドオーバ要求または前記ハンドオーバ要求に基づく要求を受信した場合、前記移動端末機の呼の状態を取得する呼状態取得ステップと、前記移動端末機が、前記呼の状態において前記ハンドオーバが可能な移動端末機であるか否かの情報を含む移動端末機情報を取得する移動端末機情報取得ステップと、前記呼状態取得ステップが取得した前記呼の状態と前記移動端末機情報取得ステップが取得した前記移動端末機情報とに基づき、前記呼の状態において前記ハンドオーバが可能な移動端末機ではない場合は、ハンドオーバ不可と判定し、前記呼の状態において前記ハンドオーバが可能な移動端末機である場合は、ハンドオーバ可能と判定するハンドオーバ判定ステップと、前記ハンドオーバ判定ステップがハンドオーバ不可と判定した場合は、前記ハンドオーバ制御装置に前記ハンドオーバを実施させないためのハンドオーバ拒否コマンドを送信し、前記ハンドオーバ判定ステップがハンドオーバ可能と判定した場合は、前記ハンドオーバ制御装置に前記ハンドオーバを実施させるためのハンドオーバ応答コマンドを送信するコマンド送信ステップと、を実行させるハンドオーバ判定プログラムを用いることができる。 <Handover determination program>
Further, when implementing the above-described handover determination device by executing a program in the IMS network, the following program can be used. In other words, a request for handing over a mobile terminal capable of voice or video call between the first network communication network and the second network communication network having a common service area with the first network communication network is handed over. A handover determination program received from a control apparatus, wherein the mobile terminal detects a deterioration in radio quality of the mobile terminal during a voice call or video call in the first network communication network. A handover request receiving step for receiving a handover request or a request based on the handover request for continuing a call by handing over a network from the first network communication network to the second network communication network; Receiving the handover request When the step receives the handover request or a request based on the handover request, a call state acquisition step of acquiring a call state of the mobile terminal, and the mobile terminal can perform the handover in the call state A mobile terminal information acquisition step for acquiring mobile terminal information including information as to whether or not the terminal is a mobile terminal, the call state acquired by the call state acquisition step, and the mobile terminal information acquisition step Based on the mobile terminal information, if the mobile terminal is not capable of handover in the call state, it is determined that handover is not possible, and if the mobile terminal is capable of handover in the call state A handover determination step for determining that a handover is possible, and the handover determination step includes a handover If it is determined that the handover is possible, a handover rejection command for not causing the handover controller to perform the handover is transmitted. If the handover determination step determines that the handover is possible, the handover controller is configured to perform the handover. A handover determination program for executing a command transmission step of transmitting a handover response command of the above can be used.
　なお、前記コマンド送信ステップは、さらに、前記ハンドオーバ判定ステップがハンドオーバ不可と判定した場合は、前記ハンドオーバ制御装置に前記ハンドオーバ要求の送信を抑止させるためのハンドオーバ抑止コマンドを前記ハンドオーバ拒否コマンドに付加して送信し、前記ハンドオーバ抑止コマンドを前記ハンドオーバ制御装置に送信後、前記ハンドオーバ判定ステップがハンドオーバ可能と判定した場合、前記ハンドオーバ制御装置に前記ハンドオーバ要求の送信の抑止を解除させるためのハンドオーバ抑止解除コマンドを送信する、ようにしてもよい。 In the command transmission step, if the handover determination step determines that handover is not possible, a handover suppression command for causing the handover control device to suppress transmission of the handover request is added to the handover rejection command. And when the handover determination step determines that handover is possible after the transmission of the handover suppression command to the handover control device, a handover suppression release command for causing the handover control device to cancel suppression of transmission of the handover request. You may make it transmit.
　＜ハンドオーバ制御プログラム＞
　また、基地局機器においてプログラムを実行することによって、上述したハンドオーバ制御装置を実現する場合、以下のプログラムを用いることができる。すなわち、第１のネットワーク通信網と前記第１のネットワーク通信網と共通のサービスエリアを有する第２のネットワーク通信網とで音声通話またはビデオ通話による通話が可能な移動端末機をハンドオーバさせる要求をハンドオーバ判定装置に送信するハンドオーバ制御プログラムであって、コンピュータに、前記第１のネットワーク通信網に在圏している前記移動端末機が送信する無線品質情報を受信する無線品質情報受信ステップと、前記無線品質情報に基づき前記第１のネットワーク通信網での前記移動端末機の無線品質が劣化しているか否か判定する無線品質判定ステップと、前記無線品質判定ステップが前記移動端末機の無線品質が劣化したと判定した場合、前記移動端末機を前記第１のネットワーク通信網から前記第２のネットワーク通信網にハンドオーバさせて通話を継続させるためのハンドオーバ要求を前記ハンドオーバ判定装置に送信するハンドオーバ要求送信ステップと、前記ハンドオーバ要求送信ステップが送信した前記ハンドオーバ要求に対し前記ハンドオーバ判定装置から返信されてくるハンドオーバ応答コマンドを受信するコマンド受信ステップと、前記コマンド受信ステップが前記ハンドオーバを実施させるための前記ハンドオーバ応答コマンドを受信した場合は前記移動端末機に前記ハンドオーバを実施させるハンドオーバ指示を送るハンドオーバ応答ステップと、前記コマンド受信ステップが前記ハンドオーバを実施させないためのハンドオーバ拒否コマンドを受信した場合は前記移動端末機に前記ハンドオーバ指示を送信しないハンドオーバ拒否ステップと、前記コマンド受信ステップが前記ハンドオーバ要求の送信を抑止させるためのハンドオーバ抑止コマンドを受信した場合は前記ハンドオーバ要求送信ステップを動作させず、前記コマンド受信ステップが前記ハンドオーバ要求の送信の抑止を解除させるためのハンドオーバ抑止解除コマンドを受信した場合は前記ハンドオーバ要求送信ステップを動作させるハンドオーバ要求送信制限ステップと、を実行させるハンドオーバ制御プログラムを用いることができる。 <Handover control program>
Further, when the above-described handover control apparatus is realized by executing a program in a base station device, the following program can be used. In other words, a request for handing over a mobile terminal capable of voice or video call between the first network communication network and the second network communication network having a common service area with the first network communication network is handed over. A handover control program to be transmitted to a determination device, comprising: a radio quality information receiving step for receiving, on a computer, radio quality information transmitted by the mobile terminal located in the first network communication network; A radio quality determination step for determining whether or not the radio quality of the mobile terminal in the first network communication network is deteriorated based on quality information, and the radio quality determination step is a deterioration of the radio quality of the mobile terminal If it is determined that the mobile terminal is not connected to the second network from the first network communication network. A handover request transmission step for transmitting a handover request for continuing a call by handing over to a network communication network to the handover determination device; and a response from the handover determination device to the handover request transmitted by the handover request transmission step. A command receiving step for receiving an incoming handover response command, and a handover response step for sending a handover instruction for causing the mobile terminal to execute the handover when the command receiving step receives the handover response command for executing the handover. When the command receiving step receives a handover rejection command for preventing the handover from being performed, a handover request that does not transmit the handover instruction to the mobile terminal is received. When the handover rejection command for suppressing the transmission of the handover request is received by the command rejection step and the command reception step, the handover request transmission step is not operated, and the command reception step suppresses the transmission of the handover request. A handover control program for executing a handover request transmission restriction step for operating the handover request transmission step when a handover suppression release command for canceling is received can be used.
　なお、本発明の範囲は、図示され記載された例示的な実施形態に限定されるものではなく、本発明が目的とするものと均等な効果をもたらすすべての実施形態をも含む。さらに、本発明の範囲は、請求項により画される発明の特徴の組み合わせに限定されるものではなく、すべての開示されたそれぞれの特徴のうち特定の特徴のあらゆる所望する組み合わせによって画されうる。 It should be noted that the scope of the present invention is not limited to the illustrated and described exemplary embodiments, and includes all embodiments that provide the same effects as those intended by the present invention. Furthermore, the scope of the invention is not limited to the combinations of features of the invention defined by the claims, but can be defined by any desired combination of particular features among all the disclosed features.
　本発明は、呼の状態がＳＲＶＣＣの規定に対応していない場合に移動端末機をハンドオーバさせてしまうことによる移動端末機の呼切断と、移動端末機とＩＭＳネットワークとの間の状態不一致を防ぐことができ、さらに不要なハンドオーバ要求の送信を抑止させることにより、基地局機器とＩＭＳネットワークとの間の無駄なトラヒックを削減する場合に利用することができる。 The present invention prevents call disconnection of a mobile terminal due to handover of the mobile terminal when the call state does not comply with the SRVCC specification and state mismatch between the mobile terminal and the IMS network. In addition, it can be used when unnecessary traffic between the base station device and the IMS network is reduced by suppressing transmission of unnecessary handover requests.
１０　ＬＴＥ網
２０　３Ｇ網
３０　移動端末機
３２　無線品質情報
４０　基地局機器
５０　ＩＭＳネットワーク
６０　３Ｇネットワーク
７０　呼制御装置
８０　移動端末機情報管理装置
１００　ハンドオーバ制御装置
１１０　無線品質情報受信部
１２０　無線品質判定部
１３０　ハンドオーバ要求送信部
１３２　ハンドオーバ要求
１４０　コマンド受信部
１５０　ハンドオーバ応答部
１５２　ハンドオーバ指示
１６０　ハンドオーバ拒否部
１７０　ハンドオーバ要求送信制限部
２００　ハンドオーバ判定装置
２１０　ハンドオーバ要求受信部
２２０　呼状態取得部
２３０　移動端末機情報取得部
２４０　ハンドオーバ判定部
２５０　コマンド送信部
２５２　ハンドオーバ応答コマンド
２６２　ハンドオーバ拒否コマンド
２７２　ハンドオーバ抑止コマンド
２８２　ハンドオーバ抑止解除コマンド
１０００　ハンドオーバ制御装置
２０００　ハンドオーバ判定装置
２５００　コマンド送信部 10 LTE network 20 3G network 30 mobile terminal 32 radio quality information 40 base station device 50 IMS network 60 3G network 70 call control device 80 mobile terminal information management device 100 handover control device 110 radio quality information reception unit 120 radio quality determination unit 130 Handover Request Transmitting Unit 132 Handover Request 140 Command Receiving Unit 150 Handover Response Unit 152 Handover Instruction 160 Handover Rejecting Unit 170 Handover Request Transmission Limiting Unit 200 Handover Determination Device 210 Handover Request Receiving Unit 220 Call State Acquisition Unit 230 Mobile Terminal Information Acquisition Unit 240 Handover determination unit 250 Command transmission unit 252 Handover response command 262 Handover rejection command 272 Handover suppression command 282 Handover suppression solution Command 1000 handover control unit 2000 handover determination unit 2500 commands the transmitting unit

Claims (7)

  1. 　第１のネットワーク通信網と前記第１のネットワーク通信網と共通のサービスエリアを有する第２のネットワーク通信網とで音声通話またはビデオ通話による通話が可能な移動端末機をハンドオーバさせる要求をハンドオーバ制御装置から受信するハンドオーバ判定装置であって、
    　前記第１のネットワーク通信網で音声通話またはビデオ通話による通話中に前記移動端末機の無線品質の劣化を検出した場合に、前記移動端末機を前記第１のネットワーク通信網から前記第２のネットワーク通信網にハンドオーバさせて通話を継続させるためのハンドオーバ要求または前記ハンドオーバ要求に基づく要求を前記ハンドオーバ制御装置から受信するハンドオーバ要求受信部と、
    　前記ハンドオーバ要求受信部が前記ハンドオーバ要求または前記ハンドオーバ要求に基づく要求を受信した場合、前記移動端末機の呼の状態を取得する呼状態取得部と、
    　前記移動端末機が、前記呼の状態において前記ハンドオーバが可能な移動端末機であるか否かの情報を含む移動端末機情報を取得する移動端末機情報取得部と、
    　前記呼状態取得部が取得した前記呼の状態と前記移動端末機情報取得部が取得した前記移動端末機情報とに基づき、前記呼の状態において前記ハンドオーバが可能な移動端末機ではない場合は、ハンドオーバ不可と判定し、前記呼の状態において前記ハンドオーバが可能な移動端末機である場合は、ハンドオーバ可能と判定するハンドオーバ判定部と、
    　前記ハンドオーバ判定部がハンドオーバ不可と判定した場合は、前記ハンドオーバ制御装置に前記ハンドオーバを実施させないためのハンドオーバ拒否コマンドを送信し、前記ハンドオーバ判定部がハンドオーバ可能と判定した場合は、前記ハンドオーバ制御装置に前記ハンドオーバを実施させるためのハンドオーバ応答コマンドを送信するコマンド送信部と、
    　を備えることを特徴とするハンドオーバ判定装置。     Handover control device for requesting handover of mobile terminal capable of voice call or video call between first network communication network and second network communication network having common service area with first network communication network A handover determination device that receives from:
    When a deterioration in radio quality of the mobile terminal is detected during a voice call or video call in the first network communication network, the mobile terminal is moved from the first network communication network to the second network. A handover request receiver for receiving a handover request for continuing a call by handing over to a communication network or a request based on the handover request from the handover control device;
    When the handover request receiving unit receives the handover request or a request based on the handover request, a call state acquiring unit that acquires a call state of the mobile terminal;
    A mobile terminal information acquisition unit for acquiring mobile terminal information including information on whether or not the mobile terminal is a mobile terminal capable of the handover in the call state;
    Based on the call state acquired by the call state acquisition unit and the mobile terminal information acquired by the mobile terminal information acquisition unit, if the mobile terminal is not capable of the handover in the call state, If it is determined that handover is not possible and the mobile terminal is capable of handover in the call state, a handover determination unit that determines that handover is possible;
    When the handover determining unit determines that the handover is impossible, the handover control device transmits a handover rejection command for preventing the handover from being performed, and when the handover determining unit determines that the handover is possible, A command transmission unit for transmitting a handover response command for performing the handover;
    A handover determination apparatus comprising:
  2. 　前記コマンド送信部は、さらに、前記ハンドオーバ判定部がハンドオーバ不可と判定した場合は、前記ハンドオーバ制御装置に前記ハンドオーバ要求の送信を抑止させるためのハンドオーバ抑止コマンドを前記ハンドオーバ拒否コマンドに付加して送信し、前記ハンドオーバ抑止コマンドを前記ハンドオーバ制御装置に送信後、前記ハンドオーバ判定部がハンドオーバ可能と判定した場合、前記ハンドオーバ制御装置に前記ハンドオーバ要求の送信の抑止を解除させるためのハンドオーバ抑止解除コマンドを送信する、ことを特徴とする請求項１に記載のハンドオーバ判定装置。 When the handover determining unit determines that the handover is impossible, the command transmitting unit further transmits a handover suppression command for causing the handover control apparatus to suppress transmission of the handover request to the handover reject command. When the handover determination unit determines that handover is possible after transmitting the handover suppression command to the handover control apparatus, transmits a handover suppression release command for canceling suppression of transmission of the handover request to the handover control apparatus The handover determination apparatus according to claim 1, wherein:
  3. 　第１のネットワーク通信網と前記第１のネットワーク通信網と共通のサービスエリアを有する第２のネットワーク通信網とで音声通話またはビデオ通話による通話が可能な移動端末機をハンドオーバさせる要求をハンドオーバ判定装置に送信するハンドオーバ制御装置であって、
    　前記第１のネットワーク通信網に在圏している前記移動端末機が送信する無線品質情報を受信する無線品質情報受信部と、
    　前記無線品質情報に基づき前記第１のネットワーク通信網での前記移動端末機の無線品質が劣化しているか否か判定する無線品質判定部と、
    　前記無線品質判定部が前記移動端末機の無線品質が劣化したと判定した場合、前記移動端末機を前記第１のネットワーク通信網から前記第２のネットワーク通信網にハンドオーバさせて通話を継続させるためのハンドオーバ要求を前記ハンドオーバ判定装置に送信するハンドオーバ要求送信部と、
    　前記ハンドオーバ要求送信部が送信した前記ハンドオーバ要求に対し前記ハンドオーバ判定装置から返信されてくるハンドオーバ応答コマンドを受信するコマンド受信部と、
    　前記コマンド受信部が前記ハンドオーバを実施させるための前記ハンドオーバ応答コマンドを受信した場合は前記移動端末機に前記ハンドオーバを実施させるハンドオーバ指示を送るハンドオーバ応答部と、
    　前記コマンド受信部が前記ハンドオーバを実施させないためのハンドオーバ拒否コマンドを受信した場合は前記移動端末機に前記ハンドオーバ指示を送信しないハンドオーバ拒否部と、
    　前記コマンド受信部が前記ハンドオーバ要求の送信を抑止させるためのハンドオーバ抑止コマンドを受信した場合は前記ハンドオーバ要求送信部を動作させず、前記コマンド受信部が前記ハンドオーバ要求の送信の抑止を解除させるためのハンドオーバ抑止解除コマンドを受信した場合は前記ハンドオーバ要求送信部を動作させるハンドオーバ要求送信制限部と、
    　を備えることを特徴とするハンドオーバ制御装置。     Handover determination device for requesting handover of mobile terminal capable of voice call or video call between first network communication network and second network communication network having common service area with first network communication network A handover control device for transmitting to
    A radio quality information receiving unit for receiving radio quality information transmitted by the mobile terminal located in the first network communication network;
    A radio quality determination unit that determines whether radio quality of the mobile terminal in the first network communication network is degraded based on the radio quality information;
    When the wireless quality determination unit determines that the wireless quality of the mobile terminal has deteriorated, the mobile terminal is handed over from the first network communication network to the second network communication network to continue the call. A handover request transmitter for transmitting a handover request of
    A command receiving unit that receives a handover response command returned from the handover determining apparatus in response to the handover request transmitted by the handover request transmitting unit;
    A handover response unit for transmitting a handover instruction for causing the mobile terminal to execute the handover when the command reception unit receives the handover response command for performing the handover;
    A handover rejection unit that does not transmit the handover instruction to the mobile terminal when the command reception unit receives a handover rejection command for not performing the handover;
    When the command reception unit receives a handover suppression command for suppressing transmission of the handover request, the command reception unit does not operate the handover request transmission unit, and the command reception unit cancels suppression of transmission of the handover request. A handover request transmission restriction unit that operates the handover request transmission unit when a handover suppression release command is received;
    A handover control apparatus comprising:
  4. 　第１のネットワーク通信網と前記第１のネットワーク通信網と共通のサービスエリアを有する第２のネットワーク通信網とで音声通話またはビデオ通話による通話が可能な移動端末機をハンドオーバさせる要求をハンドオーバ制御装置から受信するハンドオーバ判定方法であって、
    　前記第１のネットワーク通信網で音声通話またはビデオ通話による通話中に前記移動端末機の無線品質の劣化を検出した場合に、前記移動端末機を前記第１のネットワーク通信網から前記第２のネットワーク通信網にハンドオーバさせて通話を継続させるためのハンドオーバ要求または前記ハンドオーバ要求に基づく要求を前記ハンドオーバ制御装置から受信するハンドオーバ要求受信工程と、
    　前記ハンドオーバ要求受信工程が前記ハンドオーバ要求または前記ハンドオーバ要求に基づく要求を受信した場合、前記移動端末機の呼の状態を取得する呼状態取得工程と、
    　前記移動端末機が、前記呼の状態において前記ハンドオーバが可能な移動端末機であるか否かの情報を含む移動端末機情報を取得する移動端末機情報取得工程と、
    　前記呼状態取得工程が取得した前記呼の状態と前記移動端末機情報取得工程が取得した前記移動端末機情報とに基づき、前記呼の状態において前記ハンドオーバが可能な移動端末機ではない場合は、ハンドオーバ不可と判定し、前記呼の状態において前記ハンドオーバが可能な移動端末機である場合は、ハンドオーバ可能と判定するハンドオーバ判定工程と、
    　前記ハンドオーバ判定工程がハンドオーバ不可と判定した場合は、前記ハンドオーバ制御装置に前記ハンドオーバを実施させないためのハンドオーバ拒否コマンドを送信し、前記ハンドオーバ判定工程がハンドオーバ可能と判定した場合は、前記ハンドオーバ制御装置に前記ハンドオーバを実施させるためのハンドオーバ応答コマンドを送信するコマンド送信工程と、
    　を含むことを特徴とするハンドオーバ判定方法。     Handover control device for requesting handover of mobile terminal capable of voice call or video call between first network communication network and second network communication network having common service area with first network communication network A handover determination method received from
    When a deterioration in radio quality of the mobile terminal is detected during a voice call or video call in the first network communication network, the mobile terminal is moved from the first network communication network to the second network. A handover request receiving step for receiving from the handover control apparatus a handover request for causing a communication network to be handed over and continuing a call, or a request based on the handover request;
    When the handover request receiving step receives the handover request or a request based on the handover request, a call state acquisition step of acquiring a call state of the mobile terminal;
    A mobile terminal information acquisition step of acquiring mobile terminal information including information on whether the mobile terminal is a mobile terminal capable of the handover in the call state;
    Based on the call state acquired in the call state acquisition step and the mobile terminal information acquired in the mobile terminal information acquisition step, if it is not a mobile terminal capable of the handover in the call state, If it is determined that handover is impossible and the mobile terminal is capable of handover in the call state, a handover determination step of determining that handover is possible;
    When the handover determination step determines that handover is not possible, a handover rejection command for not causing the handover control device to perform the handover is transmitted, and when the handover determination step determines that handover is possible, the handover control device A command transmission step of transmitting a handover response command for executing the handover;
    A handover determination method comprising:
  5. 　第１のネットワーク通信網と前記第１のネットワーク通信網と共通のサービスエリアを有する第２のネットワーク通信網とで音声通話またはビデオ通話による通話が可能な移動端末機をハンドオーバさせる要求をハンドオーバ判定装置に送信するハンドオーバ制御方法であって、
    　前記第１のネットワーク通信網に在圏している前記移動端末機が送信する無線品質情報を受信する無線品質情報受信工程と、
    　前記無線品質情報に基づき前記第１のネットワーク通信網での前記移動端末機の無線品質が劣化しているか否か判定する無線品質判定工程と、
    　前記無線品質判定工程が前記移動端末機の無線品質が劣化したと判定した場合、前記移動端末機を前記第１のネットワーク通信網から前記第２のネットワーク通信網にハンドオーバさせて通話を継続させるためのハンドオーバ要求を前記ハンドオーバ判定装置に送信するハンドオーバ要求送信工程と、
    　前記ハンドオーバ要求送信工程が送信した前記ハンドオーバ要求に対し前記ハンドオーバ判定装置から返信されてくるハンドオーバ応答コマンドを受信するコマンド受信工程と、
    　前記コマンド受信工程が前記ハンドオーバを実施させるための前記ハンドオーバ応答コマンドを受信した場合は前記移動端末機に前記ハンドオーバを実施させるハンドオーバ指示を送るハンドオーバ応答工程と、
    　前記コマンド受信工程が前記ハンドオーバを実施させないためのハンドオーバ拒否コマンドを受信した場合は前記移動端末機に前記ハンドオーバ指示を送信しないハンドオーバ拒否工程と、
    　前記コマンド受信工程が前記ハンドオーバ要求の送信を抑止させるためのハンドオーバ抑止コマンドを受信した場合は前記ハンドオーバ要求送信工程を動作させず、前記コマンド受信工程が前記ハンドオーバ要求の送信の抑止を解除させるためのハンドオーバ抑止解除コマンドを受信した場合は前記ハンドオーバ要求送信工程を動作させるハンドオーバ要求送信制限工程と、
    　を含むことを特徴とするハンドオーバ制御方法。     Handover determination device for requesting handover of mobile terminal capable of voice call or video call between first network communication network and second network communication network having common service area with first network communication network A handover control method for transmitting to
    A radio quality information receiving step for receiving radio quality information transmitted by the mobile terminal located in the first network communication network;
    A radio quality determination step for determining whether radio quality of the mobile terminal in the first network communication network is degraded based on the radio quality information;
    When the wireless quality determination step determines that the wireless quality of the mobile terminal has deteriorated, the mobile terminal is handed over from the first network communication network to the second network communication network to continue the call. A handover request transmitting step of transmitting a handover request of
    A command reception step of receiving a handover response command returned from the handover determination device in response to the handover request transmitted by the handover request transmission step;
    A handover response step of sending a handover instruction for causing the mobile terminal to execute the handover when the command reception step receives the handover response command for performing the handover;
    A handover rejection step of not transmitting the handover instruction to the mobile terminal when the command reception step receives a handover rejection command for not performing the handover; and
    When the command reception step receives a handover suppression command for suppressing transmission of the handover request, the command reception step does not operate the handover request transmission step, and the command reception step cancels suppression of transmission of the handover request. A handover request transmission restriction step for operating the handover request transmission step when a handover suppression release command is received;
    A handover control method comprising:
  6. 　第１のネットワーク通信網と前記第１のネットワーク通信網と共通のサービスエリアを有する第２のネットワーク通信網とで音声通話またはビデオ通話による通話が可能な移動端末機をハンドオーバさせる要求をハンドオーバ制御装置から受信するハンドオーバ判定プログラムであって、
    　コンピュータに、
    　前記第１のネットワーク通信網で音声通話またはビデオ通話による通話中に前記移動端末機の無線品質の劣化を検出した場合に、前記移動端末機を前記第１のネットワーク通信網から前記第２のネットワーク通信網にハンドオーバさせて通話を継続させるためのハンドオーバ要求または前記ハンドオーバ要求に基づく要求を前記ハンドオーバ制御装置から受信するハンドオーバ要求受信ステップと、
    　前記ハンドオーバ要求受信ステップが前記ハンドオーバ要求または前記ハンドオーバ要求に基づく要求を受信した場合、前記移動端末機の呼の状態を取得する呼状態取得ステップと、
    　前記移動端末機が、前記呼の状態において前記ハンドオーバが可能な移動端末機であるか否かの情報を含む移動端末機情報を取得する移動端末機情報取得ステップと、
    　前記呼状態取得ステップが取得した前記呼の状態と前記移動端末機情報取得ステップが取得した前記移動端末機情報とに基づき、前記呼の状態において前記ハンドオーバが可能な移動端末機ではない場合は、ハンドオーバ不可と判定し、前記呼の状態において前記ハンドオーバが可能な移動端末機である場合は、ハンドオーバ可能と判定するハンドオーバ判定ステップと、
    　前記ハンドオーバ判定ステップがハンドオーバ不可と判定した場合は、前記ハンドオーバ制御装置に前記ハンドオーバを実施させないためのハンドオーバ拒否コマンドを送信し、前記ハンドオーバ判定ステップがハンドオーバ可能と判定した場合は、前記ハンドオーバ制御装置に前記ハンドオーバを実施させるためのハンドオーバ応答コマンドを送信するコマンド送信ステップと、
    　を実行させることを特徴とするハンドオーバ判定プログラム。     Handover control device for requesting handover of mobile terminal capable of voice call or video call between first network communication network and second network communication network having common service area with first network communication network A handover determination program received from
    On the computer,
    When a deterioration in radio quality of the mobile terminal is detected during a voice call or video call in the first network communication network, the mobile terminal is moved from the first network communication network to the second network. A handover request receiving step for receiving from the handover control device a handover request for making a handover to a communication network and continuing a call, or a request based on the handover request;
    When the handover request receiving step receives the handover request or a request based on the handover request, a call state acquisition step of acquiring a call state of the mobile terminal;
    Mobile terminal information acquisition step for acquiring mobile terminal information including information on whether the mobile terminal is a mobile terminal capable of the handover in the call state;
    Based on the call state acquired in the call state acquisition step and the mobile terminal information acquired in the mobile terminal information acquisition step, if the mobile terminal is not capable of the handover in the call state, If it is determined that handover is not possible and the mobile terminal is capable of handover in the call state, a handover determination step of determining that handover is possible;
    When the handover determination step determines that handover is not possible, a handover rejection command for not causing the handover control apparatus to execute the handover is transmitted, and when the handover determination step determines that handover is possible, the handover control apparatus A command transmission step of transmitting a handover response command for performing the handover;
    A handover determination program characterized in that
  7. 　第１のネットワーク通信網と前記第１のネットワーク通信網と共通のサービスエリアを有する第２のネットワーク通信網とで音声通話またはビデオ通話による通話が可能な移動端末機をハンドオーバさせる要求をハンドオーバ判定装置に送信するハンドオーバ制御プログラムであって、
    　コンピュータに、
    　前記第１のネットワーク通信網に在圏している前記移動端末機が送信する無線品質情報を受信する無線品質情報受信ステップと、
    　前記無線品質情報に基づき前記第１のネットワーク通信網での前記移動端末機の無線品質が劣化しているか否か判定する無線品質判定ステップと、
    　前記無線品質判定ステップが前記移動端末機の無線品質が劣化したと判定した場合、前記移動端末機を前記第１のネットワーク通信網から前記第２のネットワーク通信網にハンドオーバさせて通話を継続させるためのハンドオーバ要求を前記ハンドオーバ判定装置に送信するハンドオーバ要求送信ステップと、
    　前記ハンドオーバ要求送信ステップが送信した前記ハンドオーバ要求に対し前記ハンドオーバ判定装置から返信されてくるハンドオーバ応答コマンドを受信するコマンド受信ステップと、
    　前記コマンド受信ステップが前記ハンドオーバを実施させるための前記ハンドオーバ応答コマンドを受信した場合は前記移動端末機に前記ハンドオーバを実施させるハンドオーバ指示を送るハンドオーバ応答ステップと、
    　前記コマンド受信ステップが前記ハンドオーバを実施させないためのハンドオーバ拒否コマンドを受信した場合は前記移動端末機に前記ハンドオーバ指示を送信しないハンドオーバ拒否ステップと、
    　前記コマンド受信ステップが前記ハンドオーバ要求の送信を抑止させるためのハンドオーバ抑止コマンドを受信した場合は前記ハンドオーバ要求送信ステップを動作させず、前記コマンド受信ステップが前記ハンドオーバ要求の送信の抑止を解除させるためのハンドオーバ抑止解除コマンドを受信した場合は前記ハンドオーバ要求送信ステップを動作させるハンドオーバ要求送信制限ステップと、
    　を実行させることを特徴とするハンドオーバ制御プログラム。     Handover determination device for requesting handover of mobile terminal capable of voice call or video call between first network communication network and second network communication network having common service area with first network communication network A handover control program to be transmitted to
    On the computer,
    A radio quality information receiving step for receiving radio quality information transmitted by the mobile terminal located in the first network communication network;
    A radio quality determination step for determining whether or not the radio quality of the mobile terminal in the first network communication network is degraded based on the radio quality information;
    When the wireless quality determining step determines that the wireless quality of the mobile terminal has deteriorated, the mobile terminal is handed over from the first network communication network to the second network communication network to continue the call. A handover request transmitting step of transmitting a handover request of
    A command reception step of receiving a handover response command returned from the handover determination device in response to the handover request transmitted by the handover request transmission step;
    When the command reception step receives the handover response command for performing the handover, a handover response step of transmitting a handover instruction for causing the mobile terminal to perform the handover;
    A handover rejection step of not transmitting the handover instruction to the mobile terminal when the command reception step receives a handover rejection command for not performing the handover; and
    When the command reception step receives a handover suppression command for suppressing transmission of the handover request, the command reception step does not operate the handover request transmission step, and the command reception step cancels suppression of transmission of the handover request. A handover request transmission limiting step for operating the handover request transmission step when a handover suppression release command is received;
    A handover control program characterized in that
PCT/JP2013/006104 2012-10-11 2013-10-11 Handover determination device, handover control device, handover determination method, handover control method, handover determination program, and handover control program WO2014057691A1 (en)

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