CN113676975B - Communication method, MME, MSC and communication system - Google Patents

Communication method, MME, MSC and communication system Download PDF

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Publication number
CN113676975B
CN113676975B CN202111134747.2A CN202111134747A CN113676975B CN 113676975 B CN113676975 B CN 113676975B CN 202111134747 A CN202111134747 A CN 202111134747A CN 113676975 B CN113676975 B CN 113676975B
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mobile terminal
mme
msc
request
lai
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CN113676975A (en
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张余
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China United Network Communications Group Co Ltd
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China United Network Communications Group Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/36—Reselection control by user or terminal equipment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The disclosure provides a communication method, an MME, an MSC and a communication system. The communication method is applied to the MME and comprises the following steps: when receiving context request information sent by a general packet radio service support node (SGSN), confirming the current state of an SGs interface corresponding to a mobile terminal, wherein the context request information carries an indication that a Location Area Identifier (LAI) of a resident cell is the same as a combined attached LAI when the mobile terminal resides in a 2G network or a 3G network; if the current state of the SGs interface corresponding to the mobile terminal is an activated state, sending context response information carrying idle state signaling reduction ISR deactivation indication to the SGSN; sending a first request to a Mobile Switching Center (MSC); the first request is used for indicating that an SGs interface corresponding to the mobile terminal is deleted at the MSC.

Description

Communication method, MME, MSC and communication system
Technical Field
The present disclosure relates to the field of communications, and in particular, to a communication method, a Mobility Management Entity (MME), a Mobile Switching Center (MSC), and a communication system.
Background
In an Evolved Packet System (EPS), in order to reduce air interface Signaling between a mobile terminal and a core network, an Idle-mode Signaling Reduction (ISR) function is introduced. After the mobile terminal activates the ISR function, it can simultaneously register to the MME and a General Packet Radio Service (GPRS) Service Support Node (SGSN). When the mobile terminal moves under two different access networks, the position is not updated.
When the mobile terminal has an incoming call, the MSC sends a paging request to the MME, the MME pages in the range of a Tracking Area Identity (TAI) list of the mobile terminal and simultaneously sends the paging request to the SGSN, the SGSN pages in the range of a Routing Area Identity (RAI), and the mobile terminal is connected to the MSC to perform paging response and call establishment after receiving the paging request of the SGSN. Therefore, the paging request is performed in the range of two networks, air interface resources are consumed, and the burden of information interaction between network devices is increased.
Disclosure of Invention
The embodiment of the disclosure provides a communication method, an MME, an MSC and a communication system. When the mobile terminal moves to the edge of the coverage area of the 4G network and resides in the 2/3G network within the coverage area of the 2/3G network, if the LAI of the resident cell is judged to be the same as the jointly attached LAI, the ISR of the mobile terminal is triggered to not activate the flow, so that the MSC directly pages in the LAI range, and the problems of overlong call establishment time and higher resource consumption caused by longer paging flow under the starting of an ISR mechanism are solved.
In a first aspect, an embodiment of the present disclosure provides a communication method applied to an MME, including:
when receiving context request information sent by a general packet radio service support node (SGSN), confirming the current state of an SGs interface corresponding to a mobile terminal, wherein the context request information carries an indication that a Location Area Identifier (LAI) of a resident cell is the same as a combined attached LAI when the mobile terminal resides in a 2G network or a 3G network;
if the current state of the SGs interface corresponding to the mobile terminal is an activated state, sending context response information carrying an idle state signaling reduction ISR (idle state signaling reduction) inactivation indication to the SGSN;
sending a first request to a Mobile Switching Center (MSC); the first request is used for indicating that an SGs interface corresponding to the mobile terminal is deleted at the MSC.
As an optional implementation, the determining the current state of the SGs interface corresponding to the mobile terminal includes:
sending a request for inquiring the SGs interface state corresponding to the mobile terminal to the MSC;
and receiving the current state of the SGs interface corresponding to the mobile terminal from the MSC.
In a second aspect, an embodiment of the present disclosure provides a communication method, which is applied to an MSC, and the communication method includes:
deleting an SGs interface corresponding to the mobile terminal in response to a first request sent by the MME; the first request is used for indicating that an SGs interface corresponding to the mobile terminal is deleted in the MSC;
setting the paging range of the mobile terminal as the LAI of the resident cell;
and responding to the received request of the mobile terminal to be called, and paging the mobile terminal within the LAI range.
As an optional implementation, the communication method further includes:
and responding to a request sent by the MME for inquiring the state of the SGs interface corresponding to the mobile terminal, and returning the current state of the SGs interface corresponding to the mobile terminal to the MME.
In a third aspect, an embodiment of the present disclosure provides an MME, where the MME includes:
an interface query confirming module, configured to, when receiving context request information sent by a serving general packet radio service support node SGSN, confirm a current state of an SGs interface corresponding to a mobile terminal, where the context request information carries an indication that a location area identifier LAI of a residential area is the same as a jointly attached LAI when the mobile terminal resides in a 2G network or a 3G network;
an ISR indication module, configured to send, to the SGSN, a context response message carrying an idle state signaling reduction ISR deactivation indication if the current state of the SGs interface corresponding to the mobile terminal is an activated state;
the interface deletion request module is used for sending a first request to the MSC; the first request is used for indicating that an SGs interface corresponding to the mobile terminal is deleted at the MSC.
Further, the interface query confirmation module includes:
the interface query request submodule sends a request for querying the SGs interface state corresponding to the mobile terminal to the MSC;
and the interface query receiving submodule receives the current state of the SGs interface corresponding to the mobile terminal from the MSC.
In a fourth aspect, an embodiment of the present disclosure provides an MSC, including:
an interface deleting module, configured to delete an SGs interface corresponding to the mobile terminal in response to a first request sent by the MME; the first request is used for indicating that an SGs interface corresponding to the mobile terminal is deleted in the MSC;
a paging setting module, configured to set a paging range of the mobile terminal to an LAI;
and the paging initiating module is used for responding to the received request of the mobile terminal for calling the mobile terminal in the LAI range.
Further, the MSC further comprises:
and the interface query module is used for responding to a request sent by the MME for querying the state of the SGs interface corresponding to the mobile terminal and returning the current state of the SGs interface corresponding to the mobile terminal to the MME.
In a fifth aspect, an embodiment of the present disclosure provides a communication system, where the communication system includes an MME, an MSC, an SGSN, and a mobile terminal, where:
the MME corresponding to the MME is the MME of the third aspect;
the MSC is the MSC of the fourth aspect;
the SGSN is used for sending context response information carrying the ISR deactivation indication to the MME and sending RAU acceptance information carrying the ISR deactivation indication to the mobile terminal when the context response information carrying the ISR deactivation indication is received from the MME;
the mobile terminal is configured to set the ISR in an inactive state when receiving the RAU accept information carrying the ISR inactive indication from the SGSN.
Further, the mobile terminal is further configured to, while camping in the 2/3G network, send an RAU request to the SGSN if it is determined that the LAI of the camping cell is the same as the LAI of the joint attachment;
the SGSN is further configured to send context request information to the MME after receiving a RAU request from the mobile terminal, where the context request information carries an indication that an LAI of a cell where the mobile terminal resides is the same as an LAI of a joint attachment when the mobile terminal resides in a 2G network or a 3G network.
The embodiment of the disclosure solves the problems of too long call setup time and large resource consumption when an ISR mechanism is started. The call establishment time can be reduced in a software mode, hardware equipment does not need to be improved, user experience is improved, and equipment cost is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
fig. 1 is a flowchart applied to an MME communication method according to an embodiment of the present disclosure;
fig. 2 is a flowchart for confirming a current state of an SGs interface corresponding to a mobile terminal according to an embodiment of the present disclosure;
fig. 3 is a flowchart of a method applied to MSC communication according to an embodiment of the present disclosure;
fig. 4 is a flowchart of another method applied to MSC communication according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram of an MME provided by an embodiment of the present disclosure;
fig. 6 is a schematic diagram of another MME provided by an embodiment of the present disclosure;
fig. 7 is a schematic diagram of an MSC provided by the disclosed embodiment;
fig. 8 is a schematic diagram of another MSC provided by the disclosed embodiment;
fig. 9 is a timing diagram of a paging procedure of a mobile terminal in case of ISR activation;
fig. 10 is a timing diagram illustrating a paging procedure of a communication system according to an embodiment of the disclosure.
Detailed Description
In order to make the technical solutions of the present disclosure better understood by those skilled in the art, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only some embodiments of the present disclosure, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
For the application scenario in the background art, in order to improve the user experience, the art is continuously working on a scheme for reducing the call setup time. The inventors of the present disclosure found that one of the reasons for the long call setup time is as follows:
as shown in fig. 9, the ISR-capable mobile terminal does not activate ISR when the 4G network performs initial association after being powered on. When the mobile terminal moves to the edge of the 4G network coverage and within the coverage of the 2/3G network (2G network or 3G network, the same applies below), the mobile terminal may camp on the 2/3G network. If the Location Area Identity (LAI) of the 2/3G network cell where the mobile terminal resides is the same as the jointly attached LAI, the mobile terminal initiates a Routing Area Update (RAU) request to the SGSN, the SGSN receives the RAU request and sends context request information to the MME, after receiving the context response information of the MME, the SGSN sends RAU accept information to the mobile terminal, and the information includes an ISR activation indication.
After the mobile terminal activates the ISR, the mobile terminal may simultaneously register to the MME and the SGSN. When the mobile terminal moves under two different access networks, the position is not updated. When the mobile terminal has an incoming call, the MSC sends a paging request to the MME, the MME pages within the TAI list range of the mobile terminal and simultaneously sends the paging request to the SGSN, the SGSN pages within the RAI range, and the mobile terminal is connected to the MSC to page and respond to the paging request to establish a call after receiving the paging request of the SGSN. Therefore, the paging request is performed in the range of two networks, air interface resources are consumed, and the burden of information interaction between network devices is increased.
According to the communication method provided by the embodiment of the disclosure, when the mobile terminal resides in an 2/3G network, if the LAI of the resident cell is judged to be the same as the LAI of the combined attachment, the ISR of the mobile terminal is triggered to not activate the flow, so that the MSC directly pages in the LAI range, and the problems of overlong call setup time and higher resource consumption caused by a longer paging flow when an ISR mechanism is started are solved.
As a first aspect of the present disclosure, a communication method is provided, which is applied to an MME.
Fig. 1 is a flowchart applied to an MME communication method provided in an embodiment of the present disclosure, and as shown in fig. 1, the method includes:
step S110, when receiving context request information sent by a general packet radio service support node SGSN, determining a current state of an SGs interface corresponding to a mobile terminal, where the context request information carries an indication that a location area identifier LAI of a resident cell when the mobile terminal resides in a 2G network or a 3G network is the same as a jointly attached LAI.
Step S120, if the current state of the SGs interface corresponding to the mobile terminal is an activated state, sending a context response message carrying an idle state signaling reduction ISR deactivation indication to the SGSN.
Step S130, sending a first request to a Mobile Switching Center (MSC); the first request is used for indicating that an SGs interface corresponding to the mobile terminal is deleted at the MSC.
And starting a combined attachment process of the multi-mode card after the mobile terminal is started. And the mobile terminal multi-mode card sends an attachment request message to the MME. The carried attach type parameter indicates the attach as a joint EPS/International Mobile Subscriber Identity (IMSI) attach procedure, and the parameter indicates that the Mobile terminal has CSFB capability.
The MME sends a Location update request message to a corresponding Visitor Location Register (VLR), where the message includes parameters such as a new Location Area Identity (LAI), an IMSI of the multimode card, an MME name, and a Location update type. The VLR stores the location update information and creates SGs associations with the multimode cards under the MME. The VLR initiates a multi-mode card Location updating process to a Home Location Register (HLR) according to the user information and the Location area information, and returns confirmation information to the MME. And the MME sends an attachment receiving message to the mobile terminal to complete the joint attachment.
In the embodiment of the present disclosure, as one of the improvement points, the MME receives context request information from the SGSN, and triggers the subsequent operation of the present disclosure if an indication that the LAI of the mobile terminal residing in the 2/3G network cell is the same as the jointly attached LAI is obtained from the context request information. The MME uses the SGs interface state corresponding to the mobile terminal as a determination condition for determining whether an ISR deactivation instruction needs to be performed. When the MME confirms that the interface state of the SGs corresponding to the mobile terminal is an activated state, the following two actions are executed: firstly, the context response information responding to the SGSN context request information carries an ISR deactivation indication, the operation triggers the SGSN to send the ISR deactivation indication to the mobile terminal, and then the mobile terminal responds to the indication and is set to be in an ISR deactivation state; secondly, a request for deleting the SGs interface corresponding to the mobile terminal is sent to the MSC, and then the MSC is triggered to set the paging range of the mobile terminal as the LAI of the resident cell, so that the mobile terminal is prevented from being carried out in two network ranges.
As an alternative implementation, as shown in fig. 2, the step of confirming the current state of the SGs interface corresponding to the mobile terminal includes:
step S111, sending a request for inquiring the SGs interface state corresponding to the mobile terminal to the MSC.
Step S112, receiving the current state of the SGs interface corresponding to the mobile terminal from the MSC.
The MSC side stores information of the SGs interface state corresponding to the mobile terminal. Therefore, the MME may issue a request to the MSC to query the current state of the SGs interface corresponding to the mobile terminal. And the MSC informs the MME of the query result. If the SGs interface corresponding to the mobile terminal is in the active state, the MME continues to perform the operation in step 120.
As a second aspect of the present disclosure, a communication method is provided, which is applied to an MSC.
Fig. 3 is a flowchart applied to an MSC communication method according to an embodiment of the present disclosure, and as shown in fig. 3, the method includes:
step S210, in response to a request for deleting the SGs interface corresponding to the mobile terminal sent by the MME, deleting the SGs interface corresponding to the mobile terminal.
Step S220, the paging range of the mobile terminal is set as the LAI of the resident cell.
Step S230, in response to receiving the request for the mobile terminal to be called, paging the mobile terminal within the LAI range.
Corresponding to step S130 in the first aspect of the present disclosure, the MSC receives a request from the MME to delete the SGs interface corresponding to the mobile terminal, deletes the SGs interface, and further sets the paging range of the mobile terminal to the LAI of the residential cell, so as to prepare for paging the mobile terminal during a subsequent incoming call.
It should be noted that, when the mobile terminal has an incoming call, the MSC receives a request for calling the mobile terminal, and instead of sending a paging request to the MME, the MSC performs paging in the TAI list of the mobile terminal by the MME, or sends a paging request to the SGSN, and performs paging in the RAI range by the SGSN, the MSC directly initiates paging to the mobile terminal in the LAI range of the residential cell. Thus, the paging request need only be made within one network range. Resource waste caused by paging in a plurality of network ranges is avoided, and meanwhile, the call establishment time is shortened.
As an alternative implementation, referring to fig. 4, the method further includes:
step S240, responding to the request sent by the MME to query the state of the SGs interface corresponding to the mobile terminal, and returning the current state of the SGs interface corresponding to the mobile terminal to the MME.
Corresponding to steps S111 and S112 of the first aspect of the present disclosure, the MSC receives a request from the MME to query the state of the SGs interface corresponding to the mobile terminal, and feeds back the current state of the SGs interface to the MME.
The MSC side stores information of the SGs interface state corresponding to the mobile terminal. Therefore, the MME may issue a request to the MSC to query the current state of the SGs interface corresponding to the mobile terminal. And the MSC informs the MME of the query result. If the SGs interface corresponding to the mobile terminal is in the active state, the MME side continues to perform the operation of step 120.
As a third aspect of the present disclosure, an MME is provided.
Fig. 5 is a schematic diagram of an MME provided in an embodiment of the present disclosure, and as shown in fig. 5, the MME includes:
an interface query confirming module 101, configured to, when receiving context request information sent by a gprs support node SGSN, confirm a current state of an SGs interface corresponding to a mobile terminal, where the context request information carries an indication that a location area identifier LAI of a cell where the mobile terminal resides when residing in a 2G network or a 3G network is the same as a jointly attached LAI;
an ISR indication module 102, configured to send a context response message carrying an idle state signaling reduction ISR deactivation indication to an SGSN if a current state of an SGs interface corresponding to the mobile terminal is an activated state;
an interface deletion request module 103, configured to send a first request to an MSC; the first request is used for indicating that an SGs interface corresponding to the mobile terminal is deleted in the MSC.
When the mobile terminal moves to the edge of the coverage area of the 4G network and the coverage area of the 2/3G network, the mobile terminal resides in the 2/3G network, if the LAI of the 2/3G network cell where the mobile terminal resides is the same as the jointly attached LAI, the mobile terminal performs RAU, and the SGSN sends context request information to the MME after receiving the RAU request. The MME receives the context request information from the SGSN, and knows that the LAI of the 2/3G network cell where the mobile terminal resides is the same as the jointly attached LAI, and therefore triggers the subsequent operations of the embodiments of the present disclosure.
The MME takes the SGs interface state corresponding to the mobile terminal as a judgment condition for judging whether ISR deactivation indication needs to be carried out or not. When the interface query confirmation module 101 of the MME confirms that the interface state of the SGs corresponding to the mobile terminal is the active state, the following two actions are performed: firstly, the ISR deactivation indication is carried in the context response information responding to the SGSN context request information by the ISR indication module 102, and this operation will trigger the SGSN to also send the ISR deactivation indication to the mobile terminal, so that the mobile terminal responds to the indication and is set to the ISR deactivation state; secondly, an interface deleting request module 103 sends a request for deleting the SGs interface corresponding to the mobile terminal to the MSC, and further triggers the MSC to set the paging range of the mobile terminal as the LAI of the resident cell, thereby avoiding the operation in two network ranges.
As an alternative implementation, referring to fig. 6, the interface query confirmation module 101 includes:
an interface query request sub-module 1011 that sends a request for querying the SGs interface state corresponding to the mobile terminal to the MSC;
and an interface query receiving submodule 1012 for receiving SGs interface status information corresponding to the mobile terminal from the MSC.
The interface query confirmation module 101 of the MME further includes two sub-modules: the interface query request sub-module 1011 and the interface query receiving sub-module 1012 are responsible for sending an interface query request to the MSC and receiving an interface query result, respectively. If the SGs interface corresponding to the mobile terminal received by the interface query receiving sub-module 1012 is in an activated state, the ISR indicating module 102 and the interface deletion requesting module 103 of the MME continue to perform corresponding operations.
As a fourth aspect of the present disclosure, there is provided an MSC.
Fig. 7 is a schematic diagram of an MSC provided in an embodiment of the present disclosure, and as shown in fig. 7, the MSC includes:
an interface deleting module 201, configured to delete an SGs interface corresponding to the mobile terminal in response to a request for deleting the SGs interface corresponding to the mobile terminal, where the request is sent by the MME;
a paging setting module 202, configured to set a paging range of the mobile terminal as an LAI;
a paging initiation module 203, configured to page the mobile terminal within an LAI range in response to receiving a request for the mobile terminal to be called.
Corresponding to the interface query request sub-module 1011 and the interface query receiving sub-module 1012 of the third aspect of the present disclosure, the interface deleting module 201 of the MSC receives a request sent from the MME interface query request sub-module 1011 to delete the SGs interface corresponding to the mobile terminal, deletes the SGs interface, and then sets the paging range of the mobile terminal as the LAI of the residential cell through the paging setting module 202, so as to prepare for paging the mobile terminal during a subsequent incoming call.
When the mobile terminal has an incoming call, after receiving a request for calling the mobile terminal, the MSC does not send a paging request to the MME, the MME performs paging in the TAI list range of the mobile terminal, or sends the paging request to the SGSN, and the SGSN performs paging in the RAI range, but the paging initiation module 203 of the MSC directly initiates paging for the mobile terminal in the LAI range of the residential cell. Thus, the paging request need only be made within one network range. Resource waste caused by paging in a plurality of network ranges is avoided, and meanwhile, the call establishment time is shortened.
As an optional implementation, the MSC further includes:
an interface query module 204, configured to respond to a request sent by the MME for querying a state of an SGs interface corresponding to the mobile terminal, and return a current state of the SGs interface corresponding to the mobile terminal to the MME.
Correspondingly to the third aspect of the present disclosure, the interface query module 204 of the MSC, upon receiving a request from the MME for querying the state of the SGs interface corresponding to the mobile terminal, feeds back the current state of the SGs interface to the MME.
The MSC side stores information of the SGs interface state corresponding to the mobile terminal. Therefore, the MME may issue a request to the MSC to query the current state of the SGs interface corresponding to the mobile terminal. And the MSC informs the MME of the query result. If the SGs interface corresponding to the mobile terminal is in the active state, the MME side continues to perform the operation of step 120.
Corresponding to the interface query request sub-module 1011 and the interface query receiving sub-module 1012 of the third aspect of the present disclosure, the interface deleting module 201 of the MSC receives a request sent from the MME interface query request sub-module 1011 to delete the SGs interface corresponding to the mobile terminal, deletes the SGs interface, and then sets the paging range of the mobile terminal as the LAI of the residential cell through the paging setting module 202, so as to prepare for paging the mobile terminal during a subsequent incoming call.
As a fifth aspect of the present disclosure, a communication system is provided.
The communication system includes: the mobile terminal comprises an MME, an MSC, an SGSN and a mobile terminal, wherein the MME adopts the MME of the third aspect of the invention, and the MSC adopts the MSC of the fourth aspect of the invention;
the SGSN is used for sending context response information carrying the ISR inactivation indication to the MME and sending RAU acceptance information carrying the ISR inactivation indication to the mobile terminal when the context response information carrying the ISR inactivation indication is received from the MME;
the mobile terminal is configured to set the ISR to an inactive state when receiving, from the SGSN, the RAU accept information carrying the ISR inactive indication.
As an optional implementation, the communication system further includes:
the mobile terminal is used for sending an RAU request to the SGSN when the mobile terminal is resident in the 2/3G network and if the LAI of the resident cell is judged to be the same as the LAI of the combined attachment;
the SGSN is configured to send context request information to the MME after receiving a RAU request of the mobile terminal, where the context request information carries an indication that an LAI of a cell where the mobile terminal resides is the same as an LAI of a joint attachment when the mobile terminal resides in a 2G network or a 3G network.
The communication system provided by the fifth aspect of the present disclosure is described below with reference to 1 embodiment.
Fig. 10 is a timing diagram illustrating a paging procedure of a communication system according to an embodiment of the disclosure. As shown in fig. 10, the steps are as follows:
step S301, when the mobile terminal moves to the edge of the 4G network coverage and the 2/3G network coverage, the mobile terminal resides in the 2/3G network.
In step S302, the mobile terminal determines whether the LAI of the resident 2/3G network cell is the same as the LAI of the joint attachment. If the two are the same, the mobile terminal does not perform Location Area Update (LAU), and the MSC does not delete the SGs interface.
Step S303, the mobile terminal sends an RAU request to the SGSN.
Step S304, after the SGSN receives the RAU request, the SGSN sends context request information to the MME.
Step S305, the MME may obtain an indication that the LAI where the mobile terminal may reside in the cell is the same as the jointly attached LAI according to the context request information. Then, the MME sends a request to the MSC to query the SGs interface status corresponding to the mobile terminal.
Step S306, the MSC returns the SGs interface state corresponding to the mobile terminal according to the SGs interface state inquiry request of the MME.
Step S307, if the SGs interface state corresponding to the mobile terminal is the activated state, the MME sends context response information to the SGSN, where the context response information carries an indication that ISR is not activated.
Step S308, responding to the context response information, the SGSN sends context response information to the MME, and the ISR is definitely not activated.
Step S309, MME sends a request for deleting SGs interface corresponding to the mobile terminal to MSC.
Step S310, the MSC deletes the SGs interface corresponding to the mobile terminal.
Step 311, setting the paging range of the mobile terminal as the LAI of the resident cell.
Step S312, SGSN sends RAU acceptance information carrying ISR deactivation indication to mobile terminal.
And step S313, the mobile terminal sets ISR to be inactivated.
The steps S310 and S311 executed on the MSC and the steps S312 and S313 executed on the mobile terminal are different in execution subject, not in sequence, and not in sequence. By this point, the mobile terminal completes ISR deactivation setting and the MSC completes setting.
Step S314, when the mobile terminal has an incoming call, the MSC directly pages in the LAI range of the resident cell.
After receiving the paging request, the mobile terminal connects to the 2/3G network to send a paging response to the MSC to establish a call, and details of the specific process are not described in detail in this disclosure.
And step S315, after the mobile terminal call is completed, the mobile terminal moves from the 2/3G network to the 4G network, and sends a joint attachment location update request to the MME.
Step S316, the MME sends a location update request to the MSC.
Step S317, the MSC completes the location update.
Step S318, the MSC reestablishes the SGs interface corresponding to the mobile terminal.
According to the method, when the mobile terminal moves to the edge of the coverage area of the 4G network and the coverage area of the 2/3G network, when the mobile terminal resides in the 2/3G network, if the LAI of the resident cell is judged to be the same as the jointly attached LAI, the ISR of the mobile terminal is triggered to not activate the process, the MSC directly pages in the LAI range, and the problems that the call establishment time is too long and the resource consumption is large due to the fact that the paging process is long when an ISR mechanism is started are solved. The call establishment time can be reduced in a software mode, hardware equipment does not need to be improved, user experience is improved, and equipment cost is reduced.
It is to be understood that the above embodiments are merely exemplary embodiments that are employed to illustrate the principles of the present disclosure, and that the present disclosure is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the disclosure, and these are to be considered as the scope of the disclosure.

Claims (10)

1. A communication method is applied to a mobility management function (MME), and is characterized by comprising the following steps:
when receiving context request information sent by a serving general packet radio service support node (SGSN), confirming the current state of an SGs interface corresponding to a mobile terminal, wherein the context request information carries an indication that a Location Area Identifier (LAI) of a resident cell is the same as a jointly attached LAI when the mobile terminal resides in a 2G network or a 3G network;
if the current state of the SGs interface corresponding to the mobile terminal is an activated state, sending context response information carrying idle state signaling reduction ISR (idle mode signaling reduction) non-activation indication to the SGSN;
sending a first request to a Mobile Switching Center (MSC); the first request is used for indicating that an SGs interface corresponding to the mobile terminal is deleted in the MSC.
2. The communication method according to claim 1, wherein the confirming a current state of the SGs interface corresponding to the mobile terminal comprises:
sending a request for inquiring the SGs interface state corresponding to the mobile terminal to the MSC;
and receiving the current state of the SGs interface corresponding to the mobile terminal from the MSC.
3. A communication method applied to a mobile switching center MSC, the communication method comprising:
responding to a first request sent by a mobile management function entity (MME), and deleting a corresponding SGs interface of the mobile terminal; the first request is used for indicating that an SGs interface corresponding to the mobile terminal is deleted in the MSC;
setting the paging range of the mobile terminal as a Location Area Identifier (LAI) of a resident cell;
and responding to the received request of the mobile terminal to be called, and paging the mobile terminal within the LAI range.
4. The communication method according to claim 3, further comprising:
and responding to a request sent by the MME for inquiring the state of the SGs interface corresponding to the mobile terminal, and returning the current state of the SGs interface corresponding to the mobile terminal to the MME.
5. A mobility management function entity, MME, comprising:
an interface query confirming module, configured to, when receiving context request information sent by a serving general packet radio service support node SGSN, confirm a current state of an SGs interface corresponding to a mobile terminal, where the context request information carries an indication that a location area identifier LAI of a cell where the mobile terminal resides when residing in a 2G network or a 3G network is the same as a jointly attached LAI;
an idle state signaling reduction ISR indication module, configured to send a context response message carrying an ISR deactivation indication to the SGSN if a current state of an SGs interface corresponding to the mobile terminal is an activated state;
the interface deleting request module is used for sending a first request to a Mobile Switching Center (MSC); the first request is used for indicating that an SGs interface corresponding to the mobile terminal is deleted in the MSC.
6. The MME of claim 5, wherein the interface query confirmation module comprises:
the interface query request submodule sends a request for querying the SGs interface state corresponding to the mobile terminal to the MSC;
and the interface query receiving submodule receives the current state of the SGs interface corresponding to the mobile terminal from the MSC.
7. A mobile switching center, MSC, comprising:
the interface deleting module is used for responding to a first request sent by a mobile management function entity (MME) and deleting an SGs interface corresponding to the mobile terminal; the first request is used for indicating that an SGs interface corresponding to the mobile terminal is deleted in the MSC;
a paging setting module, configured to set a paging range of the mobile terminal as a location area identifier LAI of a residential cell;
and the paging initiating module is used for responding to the received request of the mobile terminal for calling the mobile terminal in the LAI range.
8. The MSC of claim 7, further comprising:
and the interface query module is used for responding to a request sent by the MME for querying the state of the SGs interface corresponding to the mobile terminal and returning the current state of the SGs interface corresponding to the mobile terminal to the MME.
9. A communication system, the communication system comprising a mobility management function (MME), a Mobile Switching Center (MSC), a general packet radio service (gprs) support node (SGSN), and a mobile terminal, the communication system comprising:
the MME corresponding to the MME is the MME according to any one of claims 5 to 6;
the MSC is the MSC of any one of claims 7 to 8;
the SGSN is configured to send context response information carrying explicit ISR deactivation to the MME and send routing area update RAU accept information carrying ISR deactivation to the mobile terminal when receiving context response information carrying ISR deactivation indication from the MME;
the mobile terminal is configured to set the ISR in an inactive state when receiving the RAU accept information carrying the ISR inactive indication from the SGSN.
10. The communication system of claim 9, further comprising:
the mobile terminal is further configured to send an RAU request to the SGSN if it is determined that the LAI of the camped cell is the same as the jointly attached LAI when the 2/3G network is camped;
the SGSN is further configured to send context request information to the MME after receiving the RAU request of the mobile terminal, where the context request information carries an indication that an LAI of a cell where the mobile terminal resides is the same as an LAI of a joint attachment when the mobile terminal resides in a 2G network or a 3G network.
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