WO2010091612A1 - Procédé, dispositif de coeur de réseau et sous-système de station de base pour établir un central local - Google Patents

Procédé, dispositif de coeur de réseau et sous-système de station de base pour établir un central local Download PDF

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Publication number
WO2010091612A1
WO2010091612A1 PCT/CN2010/070430 CN2010070430W WO2010091612A1 WO 2010091612 A1 WO2010091612 A1 WO 2010091612A1 CN 2010070430 W CN2010070430 W CN 2010070430W WO 2010091612 A1 WO2010091612 A1 WO 2010091612A1
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WIPO (PCT)
Prior art keywords
local exchange
message
calls
base station
station subsystem
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Application number
PCT/CN2010/070430
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English (en)
Chinese (zh)
Inventor
朱星
秦钧
王之曦
王超
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华为技术有限公司
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Publication of WO2010091612A1 publication Critical patent/WO2010091612A1/fr

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Classifications

    • 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
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0064—Transmission or use of information for re-establishing the radio link of control information between different access points
    • 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
    • H04W36/0055—Transmission or use of information for re-establishing the radio link

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a method for establishing a local exchange, a core network device, and a base station subsystem.
  • the transmission network is an important part of the wireless communication network.
  • operators in many countries and regions have affected the deployment, operation and service development of the wireless network because of the bottleneck of the transmission resources connecting the wireless access network and the core network.
  • regions such as Africa wireless networks are growing much faster than wired networks.
  • the construction of terrestrial cable transmission networks cannot be constructed in accordance with the needs of operators.
  • Even countries with abundant terrestrial transmission resources, such as China face the problem of high cost and low return on investment in the construction of transmission networks in remote areas and islands.
  • the mobile communication system is mainly composed of a mobile station (MS, Mobile Station), a base station subsystem (BSS, Base Station Subsystem), and a network subsystem (NSS, Network Station Subsystem).
  • Base Transceiver Station BTS, Base Transceiver Station
  • BSC Base Station Controller
  • the Mobile Switching Center MSC
  • the MSC 101 communicates with the BSC 102 via an A interface
  • the BSC 102 communicates with the BTS 103 via an Abis interface
  • the BTS 103 communicates with the MS 104 via an Um interface.
  • the local switching can complete the loopback of the call link in the BSS, that is, the voice data of the user plane does not flow out of the BSS, thereby implementing the specific interface transmission resource. Savings.
  • Local exchanges include local exchanges within the BSC and local exchanges within the BTS.
  • the local exchange in the BTS means that two calls are in the same BTS or in the same BTS cluster (in the case of BTS cascading), and the loopback of the voice link occurs in the corresponding BTS, as shown in Figure 1.
  • the voice link loopback of MS 104-2 of MS 104-1 occurs in BTS 103-1, and the voice link loopback of MS 104-3 and MS-104-4 occurs within the BTS 103-2 cluster.
  • BTS clusters BTS clusters
  • the voice link loopback occurs in the corresponding BSC, as shown in Figure 1, MS104-5 and MS 104.
  • a -6 voice link loopback occurs in the BSC 102-1.
  • the method for establishing a local exchange proposed in the prior art is as follows: After the MSC determines that two calls are to be located in the same BSS after the handover, and the local exchange condition is met, after the MSC to be switched, the BSS pair is indicated. Two calls establish a local exchange.
  • Embodiments of the present invention provide a method for establishing a local exchange, a core network device, and a base station subsystem, which can establish a local exchange while switching.
  • An aspect of the present invention provides the following method of establishing a local exchange.
  • Method 1 of establishing a local exchange including:
  • Method 2 of establishing a local exchange including:
  • the fifth message including information for establishing local exchange for two call requests constituting the session in the base station subsystem;
  • the third method of establishing local exchange includes:
  • Another aspect of the present invention also provides the following core network device.
  • the core network device one includes:
  • a first receiving unit configured to receive a message from the first base station subsystem, where the message includes a first message requesting handover;
  • a first determining unit configured to determine, according to the first message that is requested to be switched received by the first receiving unit, whether two calls constituting the session are located in the second base station subsystem and satisfy a condition of local exchange
  • a first sending unit configured to send a second message requesting handover to the second base station subsystem if the two calls are located in the second base station subsystem after the handover is completed and meet the condition of local exchange
  • the second message includes information indicating that the second base station subsystem establishes a local exchange for the two calls after the handover is successful.
  • Core network equipment 2 including:
  • a third receiving unit configured to receive a fifth message requesting handover from the base station subsystem, where the fifth message includes information for establishing local exchange for two call requests constituting the session in the base station subsystem;
  • a second determining unit configured to determine, according to the fifth message, whether a condition for establishing local exchange between the two calls is satisfied
  • a second sending unit configured to send, to the base station subsystem, a sixth message indicating that the switching operation is performed, when the second determining unit determines that the condition for establishing the local exchange of the two calls is satisfied, the sixth message Contains information indicating that the base station subsystem establishes a local exchange for the two calls.
  • the core network device 3 includes: a fourth determining unit, a third sending unit, and a fourth receiving unit, where:
  • a fourth determining unit configured to determine whether two calls constituting the session are located in the same base station subsystem, and satisfy a condition of local exchange establishment
  • a third sending unit configured to: when the fourth determining unit determines that the two calls constituting the session are all located in the base station subsystem, and satisfy a condition of local exchange establishment, send a query to the base station subsystem whether to switch Tenth message, the tenth message includes information indicating that the base station subsystem establishes local exchange for the two calls; according to the fourth receiving And an eleventh message received by the unit, sending a twelfth message indicating that the handover operation is performed, where the twelfth message includes information indicating that the base station subsystem establishes local exchange for the two calls;
  • the fourth receiving unit is configured to receive a message from the base station subsystem, where the message includes an eleventh message requesting handover, and the eleventh message includes establishing local exchange information for the two call requests. .
  • Yet another aspect of the present invention also provides a base station subsystem as follows.
  • the base station subsystem one includes:
  • a first receiving unit configured to receive a first message requesting handover from a core network side, where the first message includes information indicating that a local exchange is established for two calls constituting a session after the handover succeeds;
  • a first local exchange establishing unit configured to establish a local exchange for the two calls according to the first message received by the first receiving unit.
  • Base station subsystem 2 including:
  • a second sending unit configured to send a fifth message requesting handover to the core network side, where the fifth message includes information for establishing local exchange for two call requests forming a session in the base station subsystem;
  • a second receiving unit configured to receive a sixth message from the core network side indicating that a handover operation is performed, where the sixth message includes indication information for establishing local exchange for the two calls;
  • a second local exchange establishing unit configured to establish local exchange for the two calls according to the indication information that is included in the sixth message received by the second receiving unit to establish local exchange for the two calls.
  • An aspect of the present invention is to receive a first message requesting handover from a first base station subsystem, and according to the first message required to be switched, to determine that two calls constituting a session after the handover is completed will be located in the second base station subsystem. And when the condition of the local exchange is met, sending a second message requesting the handover to the second base station subsystem, indicating that the second base station subsystem establishes a local exchange for the two calls after the handover is successful, because no additional
  • the process of establishing a local exchange, realizing local exchange while switching can save the process Execution time, and save the number of messages on the A interface. Moreover, since a separate process is not required to establish a local exchange, the quality of the call is not adversely affected by establishing a local exchange, thereby improving the user experience.
  • a sixth message indicating that the handover operation is performed instructs the base station subsystem to establish a local exchange for the two calls.
  • the method for establishing a local exchange does not need to add an additional process of establishing a local exchange, and implements local exchange at the same time of the handover, thereby saving the execution time of the process and saving the number of messages of the A interface.
  • the quality of the call is not adversely affected by establishing a local exchange, thereby improving the user experience.
  • a further aspect of the present invention when determining that two calls constituting a session are located in a base station subsystem and satisfying a condition for establishing a local exchange, transmitting a tenth message asking whether to switch to the base station subsystem, indicating that the base station subsystem is The two calls establish a local exchange, and when receiving the eleventh message requesting handover from the base station subsystem, establish local exchange information for the two call requests carried in the eleventh message, and send A twelfth message indicating that the handover operation is performed instructs the third base station subsystem to establish a local exchange for the two calls.
  • the method for establishing a local exchange does not need to add an additional procedure for establishing a local exchange, and implements local exchange at the same time of the handover, thereby saving the execution time of the process and saving the number of messages of the A interface. Moreover, since a separate process is not required to establish a local exchange, the quality of the call is not adversely affected by establishing a local exchange, thereby improving the user experience.
  • FIG. 1 is a schematic diagram of a global mobile communication system in the prior art
  • Embodiment 2 is a signaling flow of Embodiment 1 of a method for establishing local switching in an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of a signaling flow of Embodiment 2 of a method 1 for establishing a local exchange according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of a signaling flow of Embodiment 1 of a method 2 for establishing a local exchange in an embodiment of the present invention
  • FIG. 5 is a schematic diagram of a signaling flow of Embodiment 2 of a method 2 for establishing a local exchange according to an embodiment of the present invention
  • Embodiment 1 of an MSC is a schematic structural diagram of Embodiment 1 of an MSC according to an embodiment of the present invention.
  • Embodiment 2 of an MSC is a schematic structural diagram of Embodiment 2 of an MSC according to an embodiment of the present invention.
  • Embodiment 3 of an MSC is a schematic structural diagram of Embodiment 3 of an MSC according to an embodiment of the present invention.
  • Embodiment 4 of an MSC according to an embodiment of the present invention.
  • Embodiment 5 of an MSC is a schematic structural diagram of Embodiment 5 of an MSC according to an embodiment of the present invention.
  • Embodiment 6 of an MSC is a schematic structural diagram of Embodiment 6 of an MSC according to an embodiment of the present invention.
  • FIG. 12 is a schematic structural diagram of Embodiment 1 of a BSS according to an embodiment of the present invention.
  • FIG. 13 is a schematic structural diagram of a second embodiment of a BSS according to an embodiment of the present invention.
  • FIG. 14 is a schematic structural diagram of a third embodiment of a BSS according to an embodiment of the present invention.
  • the handover includes cells in different BSS control areas (Inter-BSS)
  • the inter-switching and the switching between different cells in the same BSS control area (Intra-BSS) can respectively implement local switching in the above two handover procedures.
  • the corresponding inter-BSS handover establishes local exchange and intra-BSS handover to establish local exchange, which will be described in detail below.
  • Inter-BSS handover establishes local exchange: When receiving the first message requesting handover from the first BSS, it is determined that two calls constituting the session after the handover is completed will be located in the second BSS and satisfy the condition of local exchange. And sending a second message requesting handover to the second BSS, indicating that the local exchange is established for the two calls after the second BSS is successfully switched.
  • the first message, the second message, and the like are used in the description of the present application. It can be understood that the first message and the second message are only used to distinguish different messages, and are not used to indicate the function of the message or order.
  • Embodiment 1 In the handover process, the mobile stations MS1 and MS2 are involved. Before the handover, MS1 is located in BSS1, and MS2 is located in BSS2; after handover, both MS1 and MS2 are located in BSS2.
  • FIG. 2 it is a signaling flow diagram of Embodiment 1 of a method for establishing a local exchange according to an embodiment of the present invention, which specifically includes the following content.
  • the BSS1 sends a Handover Required message to the MSC.
  • the MSC After the MSC determines that the two handovers corresponding to the MS1 and the MS2 are located in the BSS2 and the two calls meet the conditions of the local exchange, the MSC sends a Handover Request message to the BSS2, in the Handover Request message.
  • the containing cell is used to indicate that the local exchange is established after the BSS2 handover succeeds.
  • the MSC can determine which calls can establish a local exchange. For example, the MSC can determine whether to allow two call setups of the session by recording the cell identity (Cell-ID) of the cell in which the two calls are formed, combining the codec used by the two calls and the current supplementary service requirements. Local exchange. For example, the MSC can determine whether a two-call can establish a local exchange according to the following aspects.
  • the codec for establishing two calls for local exchange needs to be the same or compatible, or two The code converter (TC) resources of the calls are located on the BSC.
  • the attributes of the service cannot conflict with the local exchange.
  • the attributes of supplementary services such as call waiting, call hold, and multi-party call conflict with the local exchange, and local exchange cannot be performed.
  • Call-ID the cell of the call identifier
  • other methods may be used, and the manner in which this document is filed does not limit it.
  • the MSC can establish a local exchange after the BSS2 handover is completed by the cell.
  • the cell may be: a Local Switching Indicator. . Column: The Local Switching Indicator is set to 1, indicating that BSS2 can establish local switching; the Local Switching Indicator is set to 0, indicating that BSS2 cannot establish local switching. BSS2 can establish a local exchange based on the indication of the MSC.
  • the MSC after receiving the handover request of the BSS1, the MSC determines that two calls constituting the session after the handover will be located in the BSS2, and instructs the BSS2 to establish a local exchange after the handover is completed, and the process of establishing the local exchange is performed.
  • the switching process is performed at the same time, so that the execution time of the entire process can be saved.
  • the message in the switching process is used because the indication of establishing the exchange is used, so that the number of messages of the A interface can be saved.
  • Embodiment 2 In the process of inter-BSS handover, referring to FIG. 3, it is a schematic diagram of a signaling flow of Embodiment 2 of the method 1 for establishing local exchange in the embodiment of the present invention.
  • MS1 is located in BSS1
  • MS2 is located in BSS2
  • both MS1 and MS2 are located in BSS2.
  • the difference from the first embodiment is that when the local exchange can be established, the BSS2 performs the local exchange operation after the two calls constituting the session are successfully switched, and can utilize a cell in the handover completion message. Notifying the MSC of the local exchange execution result, and the MSC clears the two calls when the local exchange establishment of the two calls is successful.
  • the core network user plane resources are provided. The following detailed process is described in detail.
  • the BSS1 sends a handover request (Handover Required) message to the MSC.
  • the Handover Required message contains a list of cells to be switched by the MS, including the cell of BSS2.
  • the MSC After the MSC determines that the two calls corresponding to the MS1 and the MS2 are located in the BSS2 and the two calls satisfy the condition of the local exchange, the MSC sends a Handover Request message requesting handover to the BSS2, Handover The request message contains a cell for indicating that the local exchange can be established after the BSS2 handover succeeds.
  • the MSC After receiving the Handover Required message, the MSC starts to send a Handover Request message to BSS2, requesting BSS2 to allocate radio resources.
  • the BSS2 returns a Handover Request Ack message indicating a handover request response to the MSC, and uses a cell in the message (for example, Local Switch Feasibility) to notify the BSS whether the local support is currently supported. Exchange, or whether local exchange can be established.
  • a cell in the message for example, Local Switch Feasibility
  • the BSS2 After the BSS2 allocates radio resources to the two calls, it returns a Handover Request Ack message to the MSC to indicate whether local exchange or local exchange can be established. For example, setting the Local Switch Feasibility cell to 1 indicates that local switching is supported, or local switching can be established; setting the Local Switch Feasibility cell to 0 means that BSS2 does not support local switching, or local switching cannot be established.
  • the MSC When the MSC confirms that the BSS2 can establish a local exchange, the MSC sends a Handover Command message indicating that the handover operation is performed to the BSS1, instructing the BSS 1 to switch.
  • the MSC After receiving the MSC, the MSC sends a Handover Command message to the BSS1, specifically: sending a Handover Command message to the MS1 through a BTS in the BSS1, where the command includes a handover reference value allocated by the BSS2, including the frequency of the allocated channel, and the like. information.
  • MS1 switches its frequency to a new frequency point and sends a Handover Access message to BSS2.
  • the BSS2 sends a Handover Detect message to the MSC.
  • BSS2 detects the validity of the MSI. If it is legal, BSS2 sends a Handover Detect message to the MSC.
  • the BBS2 sends a Handover Complete message indicating that the handover is completed to the MSC, and the MSI and the BSS2 communicate normally.
  • BSS2 can indicate whether the local exchange is successfully established by using a cell in the Handover Complete message, such as a Local Switch Result cell.
  • the MSC learns whether the local exchange is successfully established. If the MSC learns that the local exchange establishment is successful, the MSC can allocate the core network user plane resources allocated for the two calls; if the MSC learns that the local exchange establishment fails, the MSC reserves the The core network user plane resources allocated by the two calls continue to execute the existing call flow.
  • the core network user plane resources allocated by the MSC for the two calls are different according to the type of the A interface.
  • the bearer type of the A interface is Time Division Multiplex (TDM)
  • the core network user plane resources allocated by the MSC for the two calls include the circuit identification code (CIC) of the two calls.
  • the bearer type of the A interface is the Internet Protocol (IP)
  • IP IP connection endpoint
  • MGW Media Gateway
  • Address + port number Address + port number
  • the MSC releases the core network user plane resources allocated for the two calls, and the resources are resources related to the A interface, thereby saving the transmission resources of the A interface.
  • the MSC After receiving the Handover Complete message, the MSC releases the resources related to the MSI in the BSS1 by using a Clear Command message indicating the clearing of the resource.
  • the resources related to MS1 in BSS1 include related radio resources.
  • the BSS1 After the resource release related to the MS1 in the BSS1 is completed, the BSS1 sends a Clear Complete message indicating that the resource clearing is completed to the MSC.
  • the local exchange can be established at the same time of the handover, so that the number of messages of the A interface and the execution time of the processing flow can be saved, and the impact on the call quality can be reduced. Further, the embodiment can also be locally switched. After the establishment is successful, The MSC releases the core network user plane resources allocated for the two calls, thereby saving transmission resources.
  • step 303 if the Handover Request Ack message sent by the BSS2 indicates that the local exchange cannot be established for the two calls, the existing handover procedure may be continued, and the two calls may be instructed to be released by the BSS1 and the BSS2. . Or after the handover procedure ends (i.e., after step 308 is performed), the MSC instructs BSS2 to establish a local exchange for the two calls. Therefore, the local exchange can be established for the two calls, and after the local exchange is established, the core network user plane resources allocated for the two calls are released, so as to save the A interface resources as much as possible.
  • Method 2 Intra-BSS handover establishes local exchange: The MSC receives a fifth message requesting handover from the third BSS, where the fifth message includes information for establishing local exchange for two call requests constituting the session; And a fifth message from the third BSS, when it is determined that the condition for the two calls to establish the local exchange is satisfied, sending a sixth message indicating that the handover operation is performed, instructing the third BSS to establish a local exchange for the two calls.
  • both MS1 and MS2 are located in a certain BSS (set to BSS3), but no local exchange is established.
  • FIG. 4 it is a schematic diagram of a signaling flow of Embodiment 1 of a method for establishing a local exchange according to an embodiment of the present invention, which is described in detail below through specific steps.
  • the BSS3 sends, to the MSC, an Internal Handover Required message indicating that the handover is requested, where the message carries information for establishing a local exchange.
  • the message may carry the call identifiers of the calls corresponding to the MS1 and the MS2, and are respectively set to Call-ID1 and Call-ID2, and apply for establishing local exchange information for the two calls.
  • a Local Switch Indicator cell can be set in the message.
  • the Local Switch Indicator cell When the Local Switch Indicator cell is set to 1, it indicates that the call Call-ID1 and the Call-ID2 application establish a local exchange.
  • Call-ID the cell of the call identifier
  • other methods can be used, and the method described in this application does not constitute Become a limit.
  • the MSC determines that the condition for establishing the local exchange of the two calls is satisfied, the MSC sends an Internal Handover Command message indicating that the handover operation is performed to the BSS3, indicating that the BSS3 is the two calls (Call-ID 1 and Call-ID2) Establish a local exchange.
  • the MSC determines whether the two calls (Call-ID 1 and Call-ID2) satisfy the condition for establishing a local exchange, and may adopt the same technical means as in the technical solution described in the first method.
  • a Local Switch Indicator cell can be set in the Internal Handover Command message.
  • the Local Switch Indicator cell When the Local Switch Indicator cell is set to 1, it indicates that the call Call ID 1 establishes a local exchange with Call-ID2.
  • the BSS3 returns a handover complete (Handover Complete) message indicating that the handover is completed to the MSC.
  • the handover request message received by the MSC includes information for establishing local exchange for two call requests constituting the session, and the conditions for the two calls to establish local exchange are satisfied, the message is sent. Instructing the BSS to establish a local exchange, so that the local exchange can be established at the same time of the handover, which saves the process execution time. At the same time, since the handover message indicates whether the local exchange is established, no additional local exchange message is needed, so the interface A can be saved. The number of messages; and the local exchange and the handover process are the same process, so that the impact of the separate local exchange processing process on the call quality can be avoided, and the user experience is improved.
  • the Handover Complete message in step 403 may carry a cell (for example, a Local Switch Result cell) to indicate the execution result of the local exchange.
  • a cell for example, a Local Switch Result cell
  • the MSC can clear the core network user plane resources allocated for the two calls, so that the transmission resources of the A interface can be saved; and the local exchange in the BTS can also save related information.
  • the Abis interface transmits resources. If the local exchange establishment fails, the core network user plane resources allocated for the two calls are reserved, and the subsequent call flow is continued. When the MSC learns that the local exchange establishment fails, it can also actively instruct the BSS to establish a local exchange after the handover is completed.
  • the handover procedure initiated by the BSS3 may be rejected by using an Internal Handover Required Reject message indicating that the internal handover request is rejected.
  • the reason value may be set as: Not allowed to establish a local exchange (Not allowed to establish Local Switch ).
  • the MSC may also initiate a handover procedure, which is described below by way of a specific embodiment.
  • FIG. 5 is a schematic diagram of a signaling flow of Embodiment 2 of a method 2 for establishing a local exchange according to an embodiment of the present invention.
  • the MSC sends an internal handover request (Internal Handover Enquiry) message to the BSS3, asking whether to switch, the message carrying the cell indicating that the BSS3 is a call corresponding to the MS1 and the MS2 (set to Call-ID1, Call-ID2) to establish a local exchange.
  • an internal handover request Internal Handover Enquiry
  • Call-ID the cell of the call identifier
  • other methods may be used, and the manner in which this document is filed does not limit it.
  • the MSC pre-determines whether the call of Call-ID1 and Call-ID2 meets the conditions for establishing a local exchange, and may adopt the same technical means as in the technical solution described in the first method, and is not described again. And when the conditions of the local exchange are met, an Internal Handover Enquiry message is sent to the BSS3, instructing the BSS3 to establish a local exchange for the call Call-ID 1 and Call-ID2.
  • the Internal Handover Enquiry message can trigger a subsequent handover process.
  • the BSS3 sends an Internal Handover Required message to the MSC, where the message includes information for establishing a local exchange for the two calls (Call-ID1 and Call-ID2).
  • the MSC determines that the two calls (Call-ID1 and Call-ID2) establish a local exchange condition
  • the MSC sends an Internal Handover Command message to the BSS3, indicating that the BSS3 is the two calls.
  • -IDl and Call-ID2) Establish local exchange.
  • the BSS3 returns a Handover Complete message to the MSC.
  • a cell for example, a Local Switch Result cell
  • the MSC can clear the core network user plane resources allocated for the two calls, thereby saving the transmission resources of the A interface related thereto. If the local exchange establishment fails, the core network user plane resources allocated for the two calls are reserved, and the subsequent call flow is continued.
  • the MSC learns that the local exchange establishment fails, the MSC may also actively instruct the BSS to establish a local exchange.
  • the handover procedure initiated by the BSS3 may be rejected by using an Internal Handover Required Reject message. Can be set to: Not allowed to establish Local Switch.
  • the internal handover inquiry message is sent by the MSC, the handover process is triggered, and the local exchange is established in the handover process, so that the process execution time can be saved, and since the local exchange is established by the message in the handover process, Therefore, the number of messages of the A interface can be saved.
  • the MSC when the MSC sends an Internal Handover Enquiry message to the BSS3, if the message carries a message indicating that the BSS3 is a call corresponding to the MSI and the MS2 (set to Call-ID1, Call-ID2) to establish a local exchange, the BSS3 Sending an Internal Handover Required message to the MSC, where the message includes information for establishing local exchange for the two calls (Call-ID 1 and Call-ID2), at this time, the MSC does not need to repeatedly determine whether the two calls are In accordance with the conditions for establishing the local exchange, the internal Handover Command message is directly sent to the BSS3, and the BSS3 is instructed to establish a local exchange for the two calls (Call-ID1 and Call-ID2).
  • the MSC when the MSC sends an Internal Handover Enquiry message to the BSS3, if the message carries a message indicating that the BSS3 is a call corresponding to the MSI and the MS2 (set to Call-ID1, Call-ID2) to establish
  • the embodiments of the present application are not intended to limit the present invention.
  • the message used in establishing the local exchange process does not limit the message composition, and the message composition (including the cell structure) may be implemented in the message.
  • Flexible definition based on delivery may be implemented in the message.
  • FIG. 6 is a schematic structural diagram of Embodiment 1 of an MSC according to an embodiment of the present invention.
  • the MSC may be used to establish a local exchange when inter-BSS handover, and specifically includes: a first receiving unit 601, a first determining unit 602, and a A transmitting unit 603.
  • the first receiving unit 601 receives the message from the first BSS, where the message includes the first message requesting the handover; the first determining unit determines, according to the first message received by the first receiving unit 601, that the session is completed after the handover is completed. Whether the two calls are located in the second BSS and meet the conditions of the local exchange; the first sending unit 603 sends a message to the second BSS, where the message includes: after the handover is completed, the two calls will be located in the second BSS and meet the local And the second message of the request switching of the local exchange is established for the two calls after the second BSS is successfully switched.
  • the MSC can determine which calls can establish a local exchange. For example, the MSC can determine whether to allow two call setups of the session by recording the cell identity (Cell-ID) of the cell in which the two calls are formed, combining the codec used by the two calls and the current supplementary service requirements. Local exchange.
  • Cell-ID cell identity
  • Call-ID the cell of the call identifier
  • other methods may be used, and the manner in which this document is filed does not limit it.
  • the MSC in this embodiment determines whether the two calls constituting the session are located in the second BSS after the completion of the handover and meet the conditions of the local exchange, and complete the handover.
  • the second message sending the request handover indicates that the second BSS is successfully switched to establish a local exchange for the two calls. It can be seen that the establishment of the local exchange is completed in the handover process, so that the execution time of the entire process can be saved. At the same time, since the indication of establishing the local exchange is implemented by switching the message in the process, the A interface can be saved. The number of messages.
  • FIG. 7 is a schematic structural diagram of a second embodiment of an MSC according to an embodiment of the present invention.
  • the MSC 700 is different from the MSC embodiment.
  • the MSC 700 further includes: a second receiving unit 701 and a first resource management. Unit 702.
  • the second receiving unit 701 is configured to receive a message from the second BSS, where the message includes a third message indicating that the handover is complete, and the third message includes a message indicating whether the local exchange is successfully established.
  • the first resource management unit 702 The core network user plane resource allocated for the two calls is cleared when the third message received by the second receiving unit 701 includes information indicating that the local exchange establishment is successful; and may also be received by the second receiving unit 701.
  • the third message contains information indicating that the local exchange establishment fails, the core network user plane resources allocated for the two calls are reserved.
  • the core network user plane resources allocated by the MSC for the two calls are different according to the type of the A interface.
  • the core network user plane resources allocated by the MSC for the two calls include the CIC of the two calls, etc.; when the type of the A interface is IP, the MSC is the The core network user plane resources allocated for the two calls include the IP connection endpoint (IP address + port number) located on the MGW.
  • the core network user plane resources allocated for the two calls constituting the session are cleared, which can save the transmission resources of the A interface.
  • the message received by the second receiving unit 701 may further include a fourth message indicating a handover request response, where the fourth message includes information indicating that the second BSS cannot establish a local exchange; corresponding, the first sending
  • the message sent by the unit 603 may further include: when the second receiving unit 701 receives the fourth message that the second BSS cannot establish the information of the local exchange, the first BSS and the second BSS are instructed to release the message of the two calls. Or, when the fourth message received by the second receiving unit 701 includes information that the second BSS cannot establish local exchange for the two calls, after the handover is completed, the second BSS is instructed to establish a locally exchanged message. Therefore, the local exchange can be established for the two calls, and after the local exchange is established, the core network user plane resources allocated for the two calls are released, so as to save the A interface resources as much as possible.
  • FIG. 8 is a schematic structural diagram of Embodiment 3 of an MSC according to an embodiment of the present invention.
  • the MSC may be used to establish a local exchange when switching between Intra-BSS, and specifically includes: a third receiving unit 801, a second determining unit 802, and a Two transmitting unit 803.
  • the third receiving unit 801 is configured to receive a message from the third BSS, where the message includes a fifth message requesting handover, where the fifth message includes a session formed in the third BSS
  • the two call requests establish the locally exchanged information
  • the second determining unit 802 is configured to determine, according to the fifth message from the third BSS, whether the condition for establishing the local exchange of the two calls is satisfied
  • the second sending unit 803. The message is sent to the third BSS, where the message includes: when the second determining unit 802 determines that the condition that the two calls establish local exchange is satisfied, the sixth message indicating that the handover operation is performed, the sixth message Contains information indicating that the third BSS establishes a local exchange for the two calls.
  • the MSC can determine which calls can establish a local exchange. For example, the MSC can determine whether to allow two call setups of the session by recording the cell identity (Cell-ID) of the cell in which the two calls constituting the session are located, combining the codec used by the two calls and the current supplementary service requirements. Local exchange.
  • Cell-ID cell identity
  • the MSC can uniquely identify each call under the MSC by using some means of identification.
  • a cell with a call identifier (Call-ID) can be used for identification.
  • Call-ID a cell with a call identifier
  • other methods may be used, and the manner in which this document is filed does not limit it.
  • the MSC determines whether the two calls meet the condition of the local exchange, and satisfies the local condition.
  • the sixth message indicating that the handover operation is performed is instructed that the third BSS establishes a local exchange for the two calls.
  • the MSC can implement local exchange during the handover process, since no separate The local exchange establishment process can save the process execution time, and the number of messages of the A interface can be saved because the message in the handover process is used to indicate whether the local exchange is established.
  • the establishment of the local exchange and handover process is performed at the same time, which also avoids the impact on the quality of the handover when the separate process of establishing the local exchange is performed separately, so that the user experience can be improved.
  • FIG. 9 is a schematic structural diagram of a fourth embodiment of an MSC according to an embodiment of the present invention, which is different from the third embodiment of the MSC, where the second resource management unit is further included in the fourth embodiment of the MSC.
  • the message received by the third receiving unit 801 further includes a seventh message indicating that the handover is complete, and the seventh message includes the third BSS establishing a local handover for the two calls.
  • the second resource management unit 901 is configured to: when the third BSS includes the information that the third BSS establishes a local exchange success for the two calls, The core network user plane resource allocated by the two calls; and may be further configured to: when the third BSS includes the information that the local BSS fails to establish a local exchange for the two calls, The assigned core network user plane resources.
  • the core network user plane resources allocated by the MSC for the two calls are different according to the bearer type of the A interface.
  • the core network user plane resources allocated by the MSC for the two calls include the CICs of the two calls, etc.
  • the bearer type of the A interface is IP
  • the MSC is the two
  • the core network user plane resources of the call distribution include the IP connection endpoint (IP address + port number) located on the MGW.
  • the A-interface transmission resource can be saved by clearing the core network user plane resources allocated for the two calls, and the Abis interface transmission resource can be saved under the local exchange in the BTS. .
  • the message sent by the second sending unit 803 may further include: when the second determining unit 802 determines that the condition that the two calls establish local exchange is not satisfied, the rejection sent to the third BSS is The indication that the two calls establish a locally switched handover request rejects the eighth message of the handover request.
  • FIG. 10 is a schematic structural diagram of a fifth embodiment of an MSC according to an embodiment of the present invention.
  • the MSC embodiment is extended on the basis of the fourth embodiment of the MSC embodiment, and is further illustrated in FIG.
  • the third determining unit 1001 is configured to determine whether the two calls are located in the same base station subsystem and meet the condition for establishing a local exchange, and the local exchange is not established.
  • the message sent by the second sending unit 803 further includes: when the third determining unit 1001 determines that the two calls are located in the third BSS and meets the condition for establishing a local exchange, and does not establish a local exchange, sends the message to the third BSS. Querying whether the ninth message is switched, the ninth message includes a message indicating that the third BSS establishes a local exchange for the two calls.
  • FIG. 11 is a schematic structural diagram of Embodiment 5 of an MSC according to an embodiment of the present invention. The method includes: a fourth determining unit 1101, a third transmitting unit 1102, and a fourth receiving unit 1103.
  • the fourth determining unit 1101 is configured to determine whether the two calls constituting the session are located in the third BSS, and satisfy the condition of the local exchange establishment, and the local exchange is not established; the third sending unit 1102 is configured to send the third call to the third BSS.
  • the message includes: when the fourth determining unit 1101 determines that both calls constituting the session are located in the third BSS, and the condition of the local exchange establishment is satisfied, whether the inquiry sent to the third BSS is switched
  • Tenth message the tenth message includes information indicating that the third BSS establishes local exchange for the two calls; according to the eleventh message received by the fourth receiving unit 1103, the tenth indication that the switching operation is performed is sent
  • the second message the twelfth message includes information indicating that the third BSS establishes a local exchange for the two calls.
  • the fourth receiving unit 1103 is configured to receive a message from the third BSS, where the message includes an eleventh message requesting handover, and the eleventh message includes information for establishing local exchange for the two call requests.
  • the MSC in the embodiment when determining that two calls constituting a session are located in the third BSS and satisfying the condition for establishing a local exchange, the MSC in the embodiment sends a tenth message asking whether to switch, to the third BSS, indicating the third
  • the BSS establishes a local exchange for the two calls, and establishes a local exchange for the two call requests carried in the eleventh message when receiving the eleventh message requesting the handover from the third BSS.
  • Information transmitting a twelfth message indicating that the handover operation is performed instructing the third BSS to establish a local exchange for the two calls.
  • the method for establishing a local exchange does not need to add an additional process for establishing a local exchange, and implements local exchange at the same time of the handover, thereby saving the execution time of the process and saving the number of messages of the A interface. Moreover, since a separate process is not required to establish a local exchange, the quality of the call is not adversely affected by establishing a local exchange, thereby improving the user experience.
  • FIG. 12 is a schematic structural diagram of Embodiment 1 of a BSS according to an embodiment of the present invention.
  • the BSS includes: a first receiving unit 1201 and a first local exchange establishing unit 1202.
  • the first receiving unit 1201 is configured to receive a message from a core network side, where the message includes a first message requesting a handover, where the first message includes indicating that the handover is successful, and establishing a local exchange for two calls constituting the session. Information; a first local exchange establishing unit 1202, configured to The first message received by the first receiving unit 1201 establishes a local exchange for the two calls.
  • the BSS when receiving the first message requesting handover from the core network side, the BSS establishes local exchange indication information for the two calls constituting the session according to the handover successfully carried in the first message.
  • the two calls establish a local exchange. Therefore, the BSS can implement switching and local switching at the same time, thereby saving process execution time.
  • the message in the handover process carries information indicating whether to establish local exchange, the number of messages of the A interface can be saved.
  • the simultaneous execution of the handover and the local exchange also avoids the impact on the quality of the call when the handover and the local exchange are performed separately, thereby improving the user experience.
  • Inter-BSS handover establishes a local exchange process, for example, two calls in different BSSs before handover, and are located in the same BSS after handover, and meet the conditions of local exchange, the BSS can A local exchange is established for the two calls.
  • the above BSS can be further optimized and described in a specific embodiment.
  • FIG. 13 is a schematic structural diagram of a second embodiment of a BSS according to an embodiment of the present invention.
  • the first sending unit 1301 is configured to send a message to the core network, including establishing in the first local exchange.
  • the unit 1202 sends a third message to the core network side indicating that the handover is complete, and the third message includes information about whether the local exchange is successful for the two calls, so that the core network
  • the side clears the core network user plane resources allocated for the two calls when the local exchange establishment is successful, or reserves the core network user plane resources allocated for the two calls when the local exchange establishment fails.
  • the BSS introduced in the embodiment can send a local exchange establishment success message to the core network to instruct the core network to clear the core network user plane resources allocated for the two calls, thereby saving related A. Interface transmission resources.
  • the BSS 1400 includes: a second sending unit 1401, a second receiving unit 1402, and a second local switching establishing unit 1403.
  • the second sending unit 1401 is configured to send a message to the core network side, where The message includes a fifth message requesting to switch, the fifth message includes information for establishing a local exchange for two call requests constituting the session, and a second receiving unit 1402, configured to receive a message from the core network side.
  • the message includes a sixth message indicating that the handover operation is performed, the sixth message includes indication information for establishing a local exchange for the two calls, and a second local exchange establishing unit 1403, configured to be used according to the second receiving unit 1403.
  • the indication carried in the received sixth message establishes local exchange indication information for the two calls, and establishes local exchange for the two calls.
  • the BSS first sends a fifth message requesting handover to the core network side to establish a local exchange, and after receiving the sixth message from the core network side, according to the handover succeeded in the sixth message,
  • the two calls making up the session establish indications of local exchanges, establishing a local exchange for the two calls. Therefore, the BSS can implement switching and local switching at the same time, thereby saving process execution time.
  • the message in the switching process carries information indicating whether to establish local exchange, the number of messages of the A interface can be saved.
  • the simultaneous execution of the handover and the local exchange also avoids the impact on the quality of the call when the handover and the local exchange are performed separately, thereby improving the user experience.
  • Intra-BSS handover establishes a local exchange process.
  • the BSS may be the two
  • the call establishes a local exchange.
  • the BSS may be extended.
  • the message sent by the second sending unit 1401 further includes: when the local exchange is successfully established for the two calls, the indication sent to the core network side is completed.
  • the seventh message, the seventh message includes indication information that the local exchange is successful for the two calls, so that the core network side clears the core network user plane resources allocated for the two calls.
  • the BSS in the embodiment sends a message indicating that the local exchange is successfully established to the core network, and instructs the core network to clear the core network user plane resources allocated for the two calls.
  • the related A interface transmission resources can be saved, and the local exchange in the BTS can also save the Abis interface transmission resources.
  • the message received by the second receiving unit 1402 may further include a ninth message from the core network side to establish whether the local exchange inquiry is to be switched, and the ninth message includes the indication
  • the base station subsystem establishes the local exchange indication information for the two calls.
  • the second sending unit 1401 sends the request to switch when the second receiving unit 1402 receives the ninth message for establishing the local exchange. Five news.
  • GSM Global System for Mobile Communications
  • MSC Global System for Mobile Communications
  • TD-SCDMA Time Division Synchronous Code Division Multiple Access
  • LTE Long Term Evolution
  • the corresponding device is the corresponding core network device (such as: MSC server) and the base station subsystem (specifically, RNC (Radio Network Controller) or base station (NodeB)) in the system. No longer - an example .
  • first and second equivalent systems, devices or units used in the embodiments of the present invention do not indicate a certain order, but are convenient for description, and are used to distinguish different systems, devices or units.
  • the system, device or unit can implement the functions of the embodiments of the present invention.
  • the program may be stored in a computer readable storage medium, and the storage medium may include: ROM, RAM, disk or CD, etc.

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

Abstract

L'invention porte sur un procédé, un dispositif de cœur de réseau et un sous-système de station de base pour établir un central local, le procédé d'établissement d'un central local comprenant : la réception d'un premier message demandant un transfert provenant du premier sous-système de station de base ; sur la base dudit premier message demandant un transfert, lorsqu'il est déterminé que les deux appels composant la session se trouvent dans le second sous-système de station de base après achèvement du transfert, et satisfont la condition de central local, la transmission d'un second message demandant un transfert audit second système de station de base, ordonnant audit second sous-système de station de base d'établir un central local pour lesdits deux appels après réussite dudit transfert. Les solutions techniques de la présente invention ne nécessitent pas d'ajouter un processus supplémentaire pour établir le central local, et le central local est réalisé durant le transfert, de sorte que le temps pour réaliser le traitement est économisé, et le nombre de messages provenant de l'interface A est réduit. Étant donné qu'un traitement séparé n'est pas nécessaire pour établir un central local, l'influence néfaste sur la qualité de communication due à l'établissement du central local est évitée et l'expérience de l'utilisateur est ainsi améliorée.
PCT/CN2010/070430 2009-02-10 2010-01-30 Procédé, dispositif de coeur de réseau et sous-système de station de base pour établir un central local WO2010091612A1 (fr)

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CN103327551B (zh) * 2012-03-23 2018-07-13 中兴通讯股份有限公司 一种涉及本地通话本地交换的切换处理方法及基站子***

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