WO2007118408A1 - Procédé pour l'accès à une cellule d'appel de groupe et centre de commutation mobile et contrôleur de station de base associé - Google Patents

Procédé pour l'accès à une cellule d'appel de groupe et centre de commutation mobile et contrôleur de station de base associé Download PDF

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Publication number
WO2007118408A1
WO2007118408A1 PCT/CN2007/001085 CN2007001085W WO2007118408A1 WO 2007118408 A1 WO2007118408 A1 WO 2007118408A1 CN 2007001085 W CN2007001085 W CN 2007001085W WO 2007118408 A1 WO2007118408 A1 WO 2007118408A1
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Prior art keywords
assignment
group call
msc
message
bsc
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PCT/CN2007/001085
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English (en)
French (fr)
Inventor
Guoqing Bao
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Huawei Technologies Co., Ltd.
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Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2007118408A1 publication Critical patent/WO2007118408A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W76/00Connection management
    • H04W76/10Connection setup
    • H04W76/15Setup of multiple wireless link connections
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W4/00Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H04W4/08User group management

Definitions

  • the present invention relates to the field of trunking communication technologies, and in particular, to a method for group call cell access and a mobile switching center and a base station controller. Background of the invention
  • Tmnk Communication also known as Trunl ed Radio
  • Trunl ed Radio is a multi-purpose operation in which a large number of professional users of various types of sparse capacity are concentrated, and the wireless channel of the same bus is used to conduct command and dispatch.
  • High performance dedicated wireless communication Compared with the dedicated wireless communication in which the walkie-talkie system is dispersed and the resource utilization efficiency is not high, the cluster communication has the characteristics of fully utilizing the limited wireless channel resources such as dynamic channel allocation and multi-user shared channel resources, so that members participating in the cluster communication can be shared. Rich special features and business. .
  • the Voice Group Call Service (VGCS) and the Voice Broadcast Service (VBS) are all cluster communication services.
  • the VGCS service contains two members of the identity, namely the dispatcher and the business user.
  • the dispatcher can be a fixed network user or a mobile user, and participates in the voice communication of the group call through the dedicated channel established for it.
  • GSM Trunk 800M, GT800 the VGCS service can be unscheduled.
  • VBS has similar business functions as VGCS.
  • VBS service only the initiator of the broadcast has the right to speak, and the identity of the initiator can only be the dispatcher; other members, including the dispatcher of ordinary users and non-initiators No right to speak.
  • group calls described in this manual are all based on the VGCS service.
  • the relevant situation of VBS can be According to the description of the VGCS business, a simple analogy is obtained.
  • a specific group call communication is uniquely determined by the group call identifier (Group ID, G-ID) and the group call area.
  • the G-ID and the group call area are collectively referred to as a group call reference, that is, the group call reference uniquely determines a group call communication.
  • the G-ID identifies the function of the group call group, that is, which identity members participate; a mobile user can sign multiple G-IDs at the same time and set different priorities for them.
  • the group call area refers to the coverage area of the group call communication.
  • the radio cell is the basic unit. It can be composed of one or more cells belonging to the same mobile switching center (MSC) or different MSCs. The cells forming the group call area are called groups. Call the community.
  • A-MSC Anchor MSC
  • R-MSC Relay MSC
  • the MSC stores and manages data related to the group call service, including dynamic group attributes, dispatcher information in the group, group call area information, and R-MSC information.
  • the A-MSC is responsible for establishing all connections, including the connection to the designated cell of the MSC, the associated R-MSC, and the dispatching station, and completing the voice distribution; the R-MSC only needs to establish a link to the A-MSC, R-MSC Responsible for the distribution of downlink voice in the cell it manages.
  • FIG. 1 is a schematic diagram of a network structure for implementing a group call cell access procedure.
  • A-MSC 101 a base station controller (BSC) managed by the A-MSC, that is, the BSC 102 and the BSC 102 are shown.
  • a group call cell is a group call cell 103. If the group call further includes a group call cell belonging to another MSC, the network further includes at least an R-MSC 104, and a BSC 105 and a group call cell 106 belonging to the R-MSC 104.
  • Other network elements not related to the group call cell access procedure are not shown in FIG.
  • the A-MSC 101 When the group call is established, for the group call cell 103 belonging to the A-MSC 101, the A-MSC 101 sends a VGCS Assignment Request message to the BSC 102 corresponding to the group call cell 103, and the following tube is called the assignment. After receiving the assignment request, the BSC 102 allocates a group call channel to the group call cell 103, and returns to the A-MSC 101 after the assignment is successful.
  • VGCS Assignment Result message which includes the identifier of the group call cell 103, the identifier of the group call, and the flag of the assignment success, hereinafter referred to as the assignment result message;
  • the MSC 101 returns a VGCS Assignment Failure message, which includes the identity of the group call cell 103, the identity of the group call, and the flag of the assignment failure, hereinafter referred to as the assignment failure message;
  • A-MSC If the assignment result message is received, the group call cell corresponding to the message is accessed in the current group call, and if the A-MSC 101 receives the assignment failure message, the group call cell 103 corresponding to the message is removed. The group call cell 103 cannot be connected to the group call.
  • the R-MSC 104 issues an assignment request to the BSC 105, and the BSC 105 makes a request according to the assignment.
  • the group call cell 106 is allocated a group call channel, and after the assignment is successful, the assignment result message is returned to the R-MSC 104; if the assignment fails, the assignment failure message is returned to the R-MSC 104, and the R-MSC 104 receives the assignment result message according to the received message. Or the assignment failure message determines whether the group call cell 106 is added to the group call.
  • the group call area may include a plurality of group call cells, and in order to ensure that the group call is quickly established, the MSC sends the assignment request of each group call cell at the same time, which is likely to cause the A interface between the MSC and the BSC. Link congestion occurs suddenly, which in turn causes partial cell assignment request loss; if the BSC does not receive the assignment request, no message is returned to the MSC.
  • the processing method adopted by the prior art is: When the MSC sends an assignment request, a timer is started for each assignment request, which is called a timer T1. If the response message of the corresponding cell is not received until the timer T1 times out, If the result message or the assignment failure message is configured, the connection of the corresponding group call cell is removed, and the cell cannot access the current group call.
  • the prior art has the disadvantage that if a part of the assignment request is lost when the assignment request is sent to the BSC, the group call cell corresponding to the lost assignment request cannot be accessed into the group call.
  • the embodiment of the present invention provides a method for accessing a group call cell, which can ensure that the group call cell is connected to the group call as much as possible.
  • the method comprises the following steps:
  • the mobile switching center MSC After the mobile switching center MSC sends the first assignment request of the specific group call cell to the base station controller BSC, it determines whether the response message of the first assignment request returned by the BSC is received; if not, the MSC sends the group to the BSC.
  • the second assignment request of the calling cell
  • the MSC accesses the group call cell to the current group call.
  • Embodiments of the present invention also propose an MSC and a BSC for implementing the above method.
  • the MSC includes the following modules:
  • the response message judging module is configured to determine whether the response message from the BSC is received after the first module assigns the first assignment request, and if not received, send a notification to the assignment requesting and sending module to send the second assignment request. ;
  • the assignment request transceiver module is configured to send a first assignment request of the specific group call cell to the BSC, and send a second assignment request to the BSC according to the notification from the response message judgment module; and is further configured to receive the reference from the BSC With the response message of the request;
  • the group call access module is configured to: after the assignment requesting and receiving module receives the assignment result message, access the corresponding group call cell of the assignment result message to the group call.
  • the BSC includes the following modules:
  • An assignment record module for storing an assignment record of the processing result of the received assignment request
  • the assignment situation retrieval module is configured to: when the BSC receives the assignment request of the MSC, and retrieves the assignment result of the saved processing result of the assignment status record module according to the received assignment request Recording, and notifying the channel assignment module of the search result, if the search result is successful, returning the assignment result message directly to the MSC;
  • the channel assignment module is configured to assign a channel to the corresponding group call cell according to the notification from the assignment condition retrieval module, and return a success message or an assignment failure message to the MSC to which the BSC belongs according to the assignment result.
  • the method of the present invention can ensure that the group call cell accesses the group call as much as possible, overcomes the shortcoming that some group call cells cannot be accessed due to channel congestion, and improves the reliability of the system.
  • FIG. 1 is a schematic diagram of a network structure for implementing a group call cell access procedure
  • FIG. 2 is a flowchart of processing of an A-MSC according to an embodiment of the present invention.
  • FIG. 3 is a flowchart of processing of an R-MSC according to Embodiment 2 of the present invention.
  • FIG. 4 is a flow chart showing the processing of the BSC in the embodiment of the present invention.
  • the core content of the present invention is: preset the longest response time, after the MSC sends an assignment request corresponding to a specific group call cell to the BSC, if the set longest response time is reached and no response message is received from the BSC , any of the response messages including the assignment result message And the assignment failure message, the MSC sends the assignment request of the group call cell to the BSC again;
  • the BSC Upon receiving the assignment request, the BSC allocates a group call channel to the cell and returns an assignment result message.
  • the group call cell corresponding to the lost assignment request can be ensured that the access group call can be assigned again to improve the reliability of the system.
  • the longest response time can be implemented by setting the timer T2, and the duration of the timer T2 can be set according to the actual situation. If the setting is too short, close to or even less than the normal delay time of returning the assignment result message, the second delay is sent again.
  • the multiple assignment request is actually unnecessary; if it is set too long, it takes too long for the group call cell to assign the access group call again, and sometimes a group call may last only a few times. Seconds, if the group call is close to the end when the group call cell is accessed, the actual meaning is lost.
  • the duration of timer ⁇ 2 can be set to 1 second.
  • Embodiment 1 An access method of a group call cell belonging to an A-MSC.
  • FIG. 2 the processing flow of the A-MSC 101 is as shown in FIG. 2, and includes the following steps:
  • Step 201 The A-MSC 101 sends a first assignment request to the group call cell 103 to the BSC 102, and starts a timer T2.
  • Step 202 A-MSC 101 determines whether a response message is received before the timer T2 times out, the response message is an assignment result message or an assignment failure message, and if yes, step 203 is performed, otherwise, go to step 205;
  • Step 203 A-MSC 101 determines whether the received response message is an assignment result message, if yes, go to step 208, otherwise, it is an assignment failure message, and step 204 is performed;
  • Step 204 A-MSC 101 stops timer T2;
  • Step 205 A-MSC 101 sends a second assignment request to BSC 102 and starts timer T1;
  • Step 206 The A-MSC 101 determines whether the assignment result message is received before the timer T1 times out. If yes, the process goes to step 208. Otherwise, the timer T1 times out or the assignment failure message is received before the timer T1 times out. Step 207;
  • Step 207 The A-MSC 101 removes the connection of the group call cell 103. If the assignment failure message is received, the A-MSC 101 also stops the timer T1. After the execution is completed, the process ends.
  • the second assignment request may also send the second assignment request only to the group call cell that does not return the response message, as long as the A-MSC 101 in step 203 determines that the assignment failure message is received, the corresponding The processing operation is to remove the connection of the group call cell 103, stop the timer T2, and exit the flow.
  • Embodiment 2 An access method of a group call cell belonging to an R-MSC.
  • This embodiment corresponds to the access method of the group call cell 106 in FIG. Taking the network structure shown in FIG. 1 as an example, the A-MSC 101 establishes a connection with the R-MSC 104 as soon as the group call is started, and then the R-MSC independently completes the interaction process with the BSC 105 managed by it.
  • the processing flow of the R-MSC 104 is as shown in FIG. 3, and includes the following steps:
  • Step 301 After establishing the connection with the A-MSC 101, the R-MSC 104 sends an assignment request to the group call cell 106 to the BSC 105, starts the timer T2, and stores the received assignment request in the local temporary storage. Area;
  • Step 302 The R-MSC 104 determines whether a response message from the BSC 105 is received before the timer T2 times out. The response message is an assignment result message or an assignment failure message. If yes, step 303 is performed; otherwise, the process proceeds to step 305; Step 303: The R-MSC 104 determines whether the received response message is an assignment result message, if yes, go to step 308, otherwise the assignment failure message is received, and step 304 is performed;
  • Step 304 The R-MSC 104 stops the timer T2;
  • Step 305 The R-MSC 104 sends the assignment request in the temporary storage area to the BSC 105 and starts the timer T1.
  • Step 306 The R-MSC 104 determines whether the assignment result message is received before the timer T1 times out. If yes, the process goes to step 308, otherwise step 307 is performed;
  • Step 307 The R-MSC 104 removes the connection of the group call cell 106. If the assignment failure message is received, the R-MSC 104 also stops the timer T1. After the execution is completed, the process ends. Step 308: The R-MSC 104 will The group call cell 106 accesses the group call, and the process ends when the execution is completed.
  • the BSC may continuously receive two identical assignment requests in a short time interval, but actually only requires the BSC to perform an operation of assigning a group call channel. Instead of receiving an assignment request, the assignment of the group call channel is performed. Therefore, the BSC needs to be able to have a short-term memory function for the received assignment request, and the processing result information corresponding to the received assignment request is temporarily stored, and the processing result is related to the assignment result message or the assignment failure message.
  • the information includes a group call identifier, a group call cell identifier, a processing result flag, and a corresponding assignment result message or an assignment failure message may be assembled according to the stored processing result information.
  • the processing results include assignment success and assignment failure.
  • the BSC Upon receiving the assignment request of the MSC, the BSC determines, according to the stored processing result information, whether the same assignment request has been processed, and if yes, further determines whether the processing result is successful or failed, and if successful, Then, according to the stored processing result information, the corresponding assignment result message is assembled, and the assembled assignment result message is returned to the MSC; If it is a failure, the operation of assigning the group call channel is performed, and the assignment result message or the assignment failure message is returned to the MSC according to the result of the operation; if the same assignment request is not received, the assignment group call channel is performed. The operation returns the result of the operation to the MSC, and temporarily stores the current processing result information.
  • the solution of the present invention sets the assignment status record in the BSC, and is used to save the processing result of the BSC to the received assignment request.
  • the BSC processing procedure includes the following steps:
  • Step 401 The BSC receives the assignment request of the MSC, and retrieves the assignment status record according to the received assignment request. If the processing result information of the assignment request is retrieved in the assignment status record, step 402 is performed. Otherwise, go to step 405;
  • Step 402 The BSC determines whether the processing result corresponding to the assignment request in the assignment status record is successful, and if yes, executing step 403; otherwise, proceeding to step 404;
  • Step 403 The BSC assembles the corresponding assignment result message according to the assignment request processing result information retrieved from the assignment situation record, returns the assembled assignment result message to the MSC, and ends the processing flow;
  • Step 404 The BSC assigns a group call channel to the corresponding group call cell according to the received assignment request. If the assignment succeeds, the assignment result message is returned to the MSC. If the assignment fails, the assignment failure message is returned to the MSC. After the execution is completed, the processing flow is ended;
  • Step 405 The BSC assigns a group call channel to the corresponding group call cell according to the received assignment request. If the assignment succeeds, the assignment result message is returned to the MSC. If the assignment fails, the assignment failure message is returned to the MSC. The assignment request and the corresponding assignment result message or the assignment failure message are saved in the local assignment status record, and the processing flow is terminated after the execution is completed.
  • the content in the assignment record can be set to be emptied periodically.
  • the BSC adopts the above processing procedure, and in some abnormal cases, the MSC receives two responses from the BSC to the same assignment request. Therefore, the assignment is also set in the MSC.
  • the status record is used to save the assignment processing result information from the BSC.
  • it When receiving the assignment result message or the assignment failure message, it first searches whether the stored assignment status record has the same group call as the received message.
  • the cell identifier and the record of the same group call identifier, if not, are processed according to the received message, and generate a group call cell identifier, a group call identifier, and an assignment result of the assignment result including the received message.
  • the situation record if there is, the result of the processing in the assignment record is further judged, and the result of the judgment is processed as follows:
  • the second case the processing result in the assignment record is the assignment failure, and the received result message is sent to the group call corresponding to the group call cell identifier in the assignment result message, and Change the processing result in the assignment record to the assignment success and perform the next steps;
  • the processing result in the assignment status record is the assignment failure. If the assignment failure message is received, the subsequent steps are directly executed.
  • the timer T1 and the timer T2 may be the same timer or different timers. If the timer is the same timer, the timer T1 is stopped and the timer T1 is started. The T1 reset restarts timing.
  • the MSC needs to be improved.
  • the MSC must have at least a response message judging module, an assignment request transceiver module, and a group call access module, where the response message judging module is used to determine the assignment module. After receiving the first assignment request, whether to receive a response message from the BSC, if not received, send a notification to the assignment requesting and transmitting module to send a second assignment request;
  • the first request for sending a specific group call cell to the BSC is requested by the assignment request transceiver module. And sending, according to the notification from the response message determining module, a second assignment request to the BSC; and a response message for receiving the assignment request from the BSC;
  • the group call access module is configured to: after the assignment requesting and receiving module receives the assignment result message, the corresponding group call cell of the assignment result message is connected to the group call.
  • the response message judging module may further include a first timer unit, configured to start a timer corresponding to the first assignment request while the assignment request transceiver module sends the first assignment request T2;
  • the response message determining module determines whether the response message from the BSC is received: determining whether the response message of the first assignment request is received before the timer T2 times out.
  • the MSC further includes a group call removal module, and the response message determining module is further configured to determine whether the assignment request transceiver module receives the assignment failure message or does not receive the response message after issuing the second assignment request, if Notifying the group to call the removal module;
  • the group call removal module is configured to remove the connection of the corresponding group call cell according to the notification of the response message judgment module.
  • the response message judging module further includes a second timing unit, configured to start a timer T1 corresponding to the second assignment request, while the assignment request transceiver module sends the second assignment request;
  • response message determining module determines whether the assignment failure message is received, and the response message determining module determines that the assignment request transceiver module receives the assignment failure message before the timer T1 times out;
  • the response message judging module judges that the response message is not received: the response message judging module judges that the timer T1 times out and the assignment requesting and receiving module does not receive the assignment result message or the assignment failure message.
  • the MSC may further include:
  • Assignment status record module for storing the result of the processing of the received assignment request Matching record
  • the assignment situation retrieval module is configured to: after the assignment request transceiver module receives the assignment result message or the assignment failure message, retrieve the assignment status record of the saved processing result of the assignment status record module, and update or modify according to the retrieval condition. Recording the corresponding assignment status; and informing the group call access module to access the group call cell corresponding to the assignment result message, or notify the group call removal module to disconnect the group call corresponding to the assignment failure message The connection of the cell.
  • the solution of the embodiment of the present invention can be implemented without any change, or the following module can be added to the original channel assignment module in the BSC:
  • the assignment status record module is used to save the pair. a record of the assignment of the processing result of the received assignment request;
  • the assignment situation retrieval module is configured to, when the BSC receives the assignment request of the MSC, retrieve the assignment record of the saved processing result of the assignment status record module according to the received assignment request, and notify the channel of the search result The assignment module returns the assignment result message directly to the MSC if the search result is successful.
  • the channel assignment module is configured to assign a channel to the corresponding group call cell according to the notification from the assignment condition retrieval module, and return an assignment success message or an assignment failure message to the MSC to which the BSC belongs according to the assignment result.

Description

一种组呼小区接入的方法及其移动交换中心和基站控制器 技术领域
本发明涉及集群通信技术领域, 特别涉及一种组呼小区接入的方法 及其移动交换中心和基站控制器。 发明背景
集群通信(Tmnk Communication)又称集群无线通信 ( Trunl ed Radio ), 是将一定数量各种类别稀疏容量的专业用户集中起来, 利用同 —总线的无线信道, 进行以指挥调度为主体的多用途、 高效能专用无线 通信。 相对于对讲机系统这样分散运行、 资源利用效率不高的专用无线 通信而言, 集群通信具有动态信道分配、 多用户共享信道资源等充分利 用有限无线信道资源的特点, 使参与集群通信的成员可共享丰富的特殊 功能及业务。 .
语音组呼业务 (Voice Group Call Service, VGCS)和语音广播业务 (Voice Broadcast Service, VBS)都属于集群通信业务。 VGCS业务中包含 两种身份的成员, 即调度员和业务用户。 调度员可以是固网用户也可以 是移动用户, 通过为其建立的专用信道参与组呼的话音通信, 在现有 GSM 800M数字集群系统(GSM Trunk 800M, GT800 )标准中, VGCS 业务可以没有调度员或最多五个调度员; 业务用户指预订了 VGCS业务 的移动用户, 数量不限, 通过组呼区域内的组呼信道参与組呼的话音通 信。 VBS具有和 VGCS相似的业务功能, 主要差别是 VBS业务中, 只 有广播的发起者有讲话的权利, 并且发起者的身份只能是调度员; 其他 成员, 包括普通用户和非发起者的调度员没有讲话的权利。 如无特别指 出, 本说明书以下所述组呼均以 VGCS业务为例, VBS的相关情况可依 照对 VGCS业务的说明简单类比得出。
一个特定的组呼通信由组呼标识(Group ID, G-ID )和组呼区域唯 一确定。 G-ID与组呼区域合起来称作组呼参考, 即組呼参考唯一确定一 个组呼通信。 G-ID标识该组呼組的功能, 即由哪些身份的成员参加; 一 个移动用户可以同时签约多个 G-ID, 并给它们设置不同的优先级。組呼 区域是指组呼通信所覆盖的范围, 以无线小区为基本单位, 可以由一个 或一个以上属于相同移动交换中心 (MSC )或不同 MSC的小区組成, 组成组呼区域的小区称为組呼小区。 涉及多个 MSC的组呼业务, 其中 一个 MSC '负责呼叫的管理, 称为主持 MSC ( Anchor MSC, A-MSC ), 其它 MSC称为转播 MSC ( Relay MSC, R-MSC )。 MSC中存储并管理 与组呼业务相关的数据, 其中包括动态组属性、 组内的调度员信息、 组 呼区域信息、 R-MSC信息等。 A-MSC负责建立所有的连接, 包括到本 MSC的指定小区、相关 R-MSC以及调度台的连接, 并完成话音的分发; R-MSC到 A-MSC仅需建立一条链路, R-MSC负责其管理的小区下行话 音的分发。
图 1示出了实现组呼小区接入流程的网絡结构示意图, 为了表述筒 洁,仅画出 A-MSC 101 , A-MSC管理的一个基站控制器(BSC )即 BSC 102以及 BSC 102下面的一个组呼小区即组呼小区 103; 如果组呼还包 括属于其他 MSC的组呼小区, 则网络中还至少包括 R-MSC 104, 以及 属于 R-MSC 104的 BSC 105和组呼小区 106。与组呼小区接入流程无关 的其他网元均未在图 1中示出。
組呼建立时, 对于属于 A-MSC 101的组呼小区 103 , A-MSC 101要 向组呼小区 103 对应的 BSC 102发送一条 VGCS 指配请求( VGCS Assignment Request )消息, 以下筒称为指配请求; BSC 102收到指配请 求后, 为組呼小区 103分配组呼信道, 分配成功后向 A-MSC 101返回 VGCS指配结果(VGCS Assignment Result )消息, 该消息中包含组呼小 区 103的标识, 本次组呼的标识, 以及指配成功的标志, 以下简称为指 配结果消息; 分配失败则向 A-MSC 101返回 VGCS指配失败(VGCS Assignment Failure ) 消息, 该消息中包含组呼小区 103的标识 , 本次组 呼的标识,以及指配失败的标志,以下简称为指配失败消息; A-MSC 101 如果收到指配结果消息, 则将该消息对应的组呼小区接入本次组呼中, A-MSC 101 如果收到指配失败消息, 则拆除与该消息对应的组呼小区 103的连接,组呼小区 103不能接入到本次组呼中。对于属于 R-MSC 104 的组呼小区 106, 则当 A-MSC 101与 R-MSC 104之间建立连接后, 由 R-MSC 104向 BSC 105发出指配请求,并由 BSC 105根据指配请求为组 呼小区 106分配组呼通道,分配成功后向 R-MSC 104返回指配结果消息; 分配失败则向 R-MSC 104返回指配失败消息, R-MSC 104根据收到的 指配结果消息或指配失败消息决定是否将组呼小区 106加入本次組呼 中。
在实际应用中, 組呼区域可能包括很多組呼小区, 而为了保证快速 建立組呼, MSC几乎同时发送各个组呼小区的指配请求,这就很有可能 造成 MSC与 BSC之间的 A接口突发性地出现链路拥塞,进而导致部分 小区指配请求丟失; 如果 BSC没有收到指配请求, 则不会向 MSC返回 任何消息。 现有技术采取的处理办法是: MSC发出指配请求时, 对于每 一条指配请求启动一个定时器, 称为定时器 T1 , 如果直到定时器 T1超 时没有收到对应小区的响应消息, 即指配结果消息或指配失败消息, 则 拆除对应的组呼小区的连接, 该小区不能接入到本次组呼中。
因此, 现有技术存在的缺点是, 如果在向 BSC下发指配请求时丢失 其中部分的指配请求, 则丟失的指配请求所对应的組呼小区无法接入到 组呼当中。 发明内容
有鉴于此, 本发明实施例提出一种组呼小区接入的方法, 能够尽量 保证組呼小区接入到组呼当中。
该方法包括如下步骤:
移动交换中心 MSC向基站控制器 BSC发送特定组呼小区的第一次 指配请求后,判断是否收到 BSC返回的第一次指配请求的响应消息; 若 否, 则 MSC向 BSC发送该组呼小区的第二次指配请求;
MSC如果收到 BSC返回的指配结果消息, 则将该组呼小区接入本 次组呼。
本发明实施例还提出用于实现上述方法的 MSC和 BSC。
所述 MSC包括如下模块:
响应消息判断模块, 用于判断在指配模块发出第一次指配请求后, 是否收到来自 BSC的响应消息,若没收到则向指配请求收发模块发出发 送第二次指配请求的通知;
指配请求收发模块,用于向 BSC发送特定组呼小区的第一次指配请 求, 以及根据来自响应消息判断模块的通知向 BSC发送第二次指配请 求; 还用于接收来自 BSC的指配请求的响应消息;
组呼接入模块, 用于在指配请求收发模块收到指配结果消息后, 将 该指配结果消息相应的组呼小区接入組呼。
所述 BSC包括如下模块:
指配情况记录模块, 用于保存对所收到的指配请求的处理结果的指 配情况记录;
指配情况检索模块, 用于当 BSC收到所属 MSC的指配请求, 根据 所收到的指配请求检索指配情况记录模块已保存的处理结果的指配情 况记录, 并将检索结果通知信道指配模块, 若检索结果为指配成功, 则 直接向所属 MSC返回指配结果消息;
信道指配模块, 用于根据来自指配情况检索模块的通知, 为相应的 组呼小区指配信道, 根据指配结果向本 BSC所属 MSC返回指配成功消 息或指配失败消息。
从以上技术方案可以看出, 在 MSC发出第一次指配请求后, 判断 是否收到对应第一次指配请求的响应消息, 如果没有收到, 则发送第二 次指配请求, 这样就可以使得丟失的第一次指配请求所对应的組呼小区 还可以收到第二次指配请求, 并经过后续处理接入到本次组呼当中; 此 外, 对于第一次指配请求返回指配失败消息的组呼小区, 也可再发送第 二次指配请求, 使得这些组呼小区也尽量能接入本次组呼当中。 因此, 通过本发明方法, 可以尽量保证组呼小区接入到组呼当中, 克服由于信 道拥挤造成部分组呼小区无法接入的缺点, 提高系统的可靠性。
附图简要说明
图 1为实现组呼小区接入流程的网络结构示意图;
图 2为本发明实施例一 A-MSC的处理流程图;
图 3为本发明实施例二 R-MSC的处理流程图;
图 4为本发明.实施例中 BSC的处理流程图。
实施本发明的方式
本发明的核心内容在于, 预设最长响应时间, MSC向 BSC发送对 应于特定组呼小区的指配请求后, 如果达到所设定的最长响应时间且没 有收到来自 BSC的任何响应消息,所述任何响应消息包括指配结果消息 以及指配失败消息, 则 MSC再次向 BSC发送该组呼小区的指配请求;
BSC收到指配请求则为该小区分配組呼信道并返回指配结果消息。通过 上述处理, 可尽量保证丟失的指配请求所对应的组呼小区可以通过再次 指配接入组呼中, 提高系统的可靠性。
所述最长响应时间可通过设置定时器 T2来实现, 并且定时器 T2的 时长可根据实际情况进行设置, 如果设置得太短, 接近甚至小于返回指 配结果消息的正常延迟时间, 则再次发送的艮多指配请求实际上是不必 要的; 如果设置得太长, 则使组呼小区通过再次指配接入组呼所花费的 时间太长, 而有时一个组呼持续的时间也许只有几秒, 如果组呼小区接 入时本次组呼已经接近结束则失去了实际意义。 一般来说定时器 Τ2的 时长可设置为 1秒。
为使本发明的目的、 技术方案和优点更加清楚, 下面结合附图与具 体实施例对本发明作进一步的详细阐述。
实施例一: 属于 A- MSC的組呼小区的接入方法。
这是最筒单的一种情况, 对应于图 1中組呼小区 103的接入方法。 以图 1所示网络结构为例, 组呼小区 103的接入过程中, A-MSC 101的 处理流程如图 2所示, 包括如下步骤:
步骤 201 : A-MSC 101向 BSC 102发送对组呼小区 103的第一次指 配请求, 并启动定时器 T2;
步骤 202: A-MSC 101判断是否在定时器 T2超时前收到响应消息, 所述响应消息为指配结果消息或指配失败消息, 若是, 则执行步骤 203, 否则转至步骤 205;
步骤 203 : A-MSC 101判断所收到的响应消息是否为指配结果消息, 若是转至步驟 208, 否则收到的是指配失败消息, 执行步骤 204;
步骤 204: A- MSC 101停止定时器 T2; 步骤 205: A-MSC 101向 BSC 102发送第二次指配请求并启动定时 器 T1 ;
步骤 206: A-MSC 101判断是否在定时器 T1超时前收到指配结果消 息, 若是则转至步骤 208, 否则为定时器 T1超时或者在定时器 T1超时 前收到指配失败消息, 执行步骤 207;
步骤 207: A-MSC 101拆除组呼小区 103的连接, 如果是收到指配 失败消息, A-MSC 101还要停止定时器 T1 , 执行完毕后结束本流程; 步骤 208: A-MSC 101将組呼小区 103接入组呼并结束本流程。 上述流程中, 在第一次发出指配请求后, 对除了返回指配结果消息 以外的组呼小区, 包括未返回响应消息的组呼小区和返回指配失败消息 的组呼小区, 都要发送第二次指配请求; 本发明也可只对未返回响应消 息的组呼小区发送第二次指配请求,只要将步骤 203中 A-MSC 101判断 收到的是指配失败消息,相应的处理操作改为拆除组呼小区 103的连接, 停止定时器 T2并退出本流程即可。
实施例二: 属于 R-MSC的组呼小区的接入方法。
本实施例对应于图 1中组呼小区 106的接入方法。 以图 1所示网络 结构为例, A-MSC 101只要在开始建立組呼的时候与 R-MSC 104建立 起连接, 然后由 R-MSC独立完成与其管理的 BSC 105的交互过程。
R-MSC 104的处理流程如图 3所示, 包括如下步骤:
步骤 301 : R-MSC 104与 A-MSC 101建立连接后, 向 BSC 105发送 对组呼小区 106的指配请求, 启动定时器 T2, 并将所收到的指配请求存 储在本地的暂存区;
步骤 302: R-MSC 104判断是否在定时器 T2超时前收到来自 BSC 105的响应消息, 所述响应消息为指配结果消息或指配失败消息, 若是, 则执行步骤 303 , 否则转至步驟 305; 步驟 303: R-MSC 104判断所收到的响应消息是否为指配结果消息, 若是转至步驟 308, 否则收到的是指配失败消息, 执行步骤 304;
步骤 304: R-MSC 104停止定时器 T2;
步骤 305: R-MSC 104将暂存区中的指配请求发送至 BSC 105并启 动定时器 T1;
步骤 306: R-MSC 104判断是否在定时器 T1超时前收到指配结果消 息, 若是则转至步驟 308, 否则执行步骤 307;
步骤 307: R-MSC 104拆除组呼小区 106的连接,如果是收到指配失 败消息, R-MSC 104还要停止定时器 Tl, 执行完毕后结束本流程; 步骤 308: R-MSC 104将组呼小区 106接入组呼,执行完毕后结束本 流程。
从上述本实施例的处理流程中可以看出, 对于属于 R-MSC 的組呼 小区, 组呼小区接入的操作完全交给 R-MSC来完成。
根据上述本发明实施例中 MSC的处理流程, BSC可能在很短的时 间间隔内连续收到两次内容完全相同的指配请求, 而实际上仅要求 BSC 进行一次指配组呼信道的操作, 而不是每收到一条指配请求就进行指配 组呼信道的操作。因此 BSC需要能够对所收到的指配请求有短期的记忆 功能, 即将收到的指配请求对应的处理结果信息暂存起来, 所述处理结 果为与指配结果消息或指配失败消息相关的信息, 包括组呼标识, 组呼 小区标识, 处理结果标志, 并且 >据所存储的处理结果信息可以组装出 相应的指配结果消息或指配失败消息。 所述处理结果包括指配成功和指 配失败。 在收到 MSC的指配请求时, BSC根据存储的处理结果信息判 断是否已经对相同的指配请求进行了处理, 如果是, 则进一步判断所述 处理结果是成功或是失败, 如果是成功, 则根据存储的处理结果信息组 装出相应的指配结果消息, 并将所组装出的指配结果消息返回 MSC; 如 果是失败, 则进行指配組呼信道的操作, 并根据操作的结果向 MSC返 回指配结果消息或指配失败消息; 如果没有收到过相同的指配请求, 则 进行指配組呼信道的操作并向 MSC返回操作的结果, 并将本次的处理 结果信息暂存起来。
因此, 本发明方案在 BSC中设置指配情况记录, 用于保存 BSC对 所收到的指配请求的处理结果, 如图 4所示, BSC的处理流程包括如下 步骤:
步骤 401 : BSC收到所属 MSC的指配请求,根据所收到的指配请求 检索指配情况记录, 如果在指配情况记录中检索到对该指配请求的处理 结果信息, 则执行步骤 402, 否则转至步骤 405;
步驟 402: BSC判断指配情况记录中与该指配请求对应的处理结果 是否为成功, 若是, 则执行步骤 403; 否则转至步骤 404;
步驟 403: BSC根据从指配情况记录中检索到的指配请求处理结果 信息组装出相应的指配结果消息, 将所组装出的指配结果消息返回所属 MSC并结束本处理流程;
步骤 404: BSC根据所收到指配请求, 为相应的组呼小区指配组呼 信道, 指配成功则向所属 MSC返回指配结果消息, 指配失败则向所属 MSC返回指配失败消息, 执行完毕后结束本处理流程;
步骤 405: BSC根据所收到指配请求, 为相应的組呼小区指配组呼 信道, 指配成功则向所属 MSC返回指配结果消息, 指配失败则向所属 MSC返回指配失败消息,并将指配请求以及对应的指配结果消息或指配 失败消息保存在本地的指配情况记录中 , 执行完毕后结束本处理流程。
所述指配情况记录中的内容可以设置为定期清空。
BSC采用上述的处理流程, 则在某些异常情况下 MSC会收到来自 BSC的对同一条指配请求的两次响应。 因此, 在 MSC中也设置指配情 况记录,用于保存来自 BSC.的指配处理结果信息, 当收到指配结果消息 或指配失败消息时, 首先查找已存储的指配情况记录中是否有与所收到 消息相同组呼小区标识、 相同组呼标识的记录, 若没有, 则才艮据所收到 的消息进行相应处理, 并生成包括所收到消息的组呼小区标识、 组呼标 识以及指配结果的一条指配情况记录; 若有, 则进一步判断指配情况记 录中的处理结果, 并才 据判断的结果作如下处理:
第一种情况: 指配情况记录中的处理结果为指配成功, 则无论收到 的是指配结果消息或指配失败消息, 则直接执行后续步骤;
第二种情况: 指配情况记录中的处理结果为指配失败, 所收到的是 指配结果消息, 则将指配结果消息中组呼小区标识对应的小区加入本次 组呼中, 并将指配情况记录中的处理结果改为指配成功, 并执行后续步 骤;
第三种情况: 指配情况记录中的处理结果为指配失败, 所收到的是 指配失败消息, 则直接执行后续步骤。
可以看出, 除了第二种情况之外, 其他情况都没有额外的处理步骤 而直接执行后续步骤。
以上两个实施例中所述定时器 T1和定时器 T2可以为同一个定时器 或不同的定时器, 如果是同一个定时器, 所述停止定时器 T2并启动定 时器 T1即为将定时器 T1复位重新开始计时。
为实现本发明实施例的方案, 需要对 MSC进行改进, MSC中至少 要具有响应消息判断模块、 指配请求收发模块和組呼接入模块, 其中, 响应消息判断模块用于判断在指配模块发出第一次指配请求后, 是 否收到来自 BSC的响应消息,若没收到则向指配请求收发模块发出发送 第二次指配请求的通知;
指配请求收发模块用于向 BSC发送特定组呼小区的第一次指配请 求, 以及根据来自响应消息判断模块的通知向 BSC发送第二次指配请 求; 还用于接收来自 BSC的指配请求的响应消息;
組呼接入模块用于在指配请求收发模块收到指配结果消息后, 将该 指配结果消息相应的组呼小区接入組呼。
所述响应消息判断模块还可以进一步包括第一定时器单元, 用于在 所述指配请求收发模块发送第一次指配请求的同时, 启动与所述第一次 指配请求对应的定时器 T2;
则所述响应消息判断模块判断是否收到来自 BSC的响应消息为:判 断在所述定时器 T2超时前是否收到第一次指配请求的响应消息。
所述 MSC进一步包括组呼拆除模块, 所述响应消息判断模块进一 步用于判断指配请求收发模块在发出第二次指配请求后, 是否收到指配 失败消息或未收到响应消息, 若是则通知组呼拆除模块;
所述组呼拆除模块用于根据响应消息判断模块的通知, 拆除相应组 呼小区的连接。
所述响应消息判断模块进一步包括第二定时单元, 用于在所述指配 请求收发模块发送第二次指配请求的同时, 启动与所述第二次指配请求 对应的定时器 T1 ;
则所述响应消息判断模块判断是否收到指配失败消息包括: 响应消 息判断模块判断在所述定时器 T1超时之前, 指配请求收发模块收到指 配失败消息;
所述响应消息判断模块判断未收到响应消息为: 响应消息判断模块 判断定时器 T1 超时且指配请求收发模块未收到指配结果消息或指配失 败消息。
所述 MSC还可以进一步包括:
指配情况记录模块, 用于保存对所收到的指配请求的处理结果的指 配情况记录;
指配情况检索模块, 用于当指配请求收发模块收到指配结果消息或 指配失败消息后, 检索指配情况记录模块巳保存的处理结果的指配情况 记录, 根据检索情况更新或修改相应的指配情况记录; 并通知组呼接入 模块将所述指配结果消息对应的组呼小区接入组呼, 或者通知组呼拆除 模块将断开所述指配失败消息对应的组呼小区的连接。
对于 BSC来说,可以不进行任何改变就能够实现本发明实施例的方 案, 也可以在 BSC中在原有的信道指配模块的基础上, 增加如下模块: 指配情况记录模块, 用于保存对所收到的指配请求的处理结果的指 配^ f况记录;
指配情况检索模块, 用于当 BSC收到所属 MSC的指配请求, 根据 所收到的指配请求检索指配情况记录模块已保存的处理结果的指配情 况记录, 并将检索结果通知信道指配模块, 若检索结果为指配成功, 则 直接向所属 MSC返回指配结果消息。
所述信道指配模块则用于根据来自指配情况检索模块的通知, 为相 应的组呼小区指配信道, 根据指配结果向本 BSC所属 MSC返回指配成 功消息或指配失败消息。
以上所述仅为本发明的较佳实施例而已, 并不用以限制本发明, 凡 在本发明的精神和原则之内所作的任何修改、 等同替换和改进等, 均应 包含在本发明的保护范围之内。

Claims

权利要求书
1、 一种组呼小区接入的方法, 其特征在于, 该方法包括如下步骤: 移动交换中心 MSC向基站控制器 BSC发送特定组呼小区的第一次 指配请求后,判断是否收到 BSC返回的第一次指配请求的响应消息; 若 否, 则 MSC向 BSC发送该组呼小区的第二次指配请求;
MSC如果收到 BSC返回的指配结果消息, 则将该組呼小区接入本 次组呼。
2、 根据权利要求 1 所述的方法, 其特征在于, 所述判断是否收到 BSC返回的第一次指配请求的响应消息的结果为是, 则进一步包括: 按 现有组呼小区接入的处理流程进行处理并退出本发明流程。。
3、 根据权利要求 1 所述的方法, 其特征在于, 所述 MSC向 BSC 发送特定组呼小区的第一次指配请求进一步包括: 启动定时器 T2;
则所述判断是否收到第一次指配请求的响应消息为: 判断在定时器 T2超时前是否收到第一次指配请求的响应消息,如果是, 则为收到响应 消息, 否则为没收到响应消息。
4、 根据权利要求 3所述的方法, 其特征在于, 所述定时器 T2时长 为 1秒。
5、 才 居权利要求 1 所述的方法, 其特征在于, 所述 MSC向 BSC 发送该组呼小区的第二次指配请求之后, 进一步包括: 如果 MSC收到 指配失败消息或未收到响应消息, 则拆除该组呼小区的连接。
6、 居权利要求 1 所述的方法, 其特征在于, 所述 MSC向 BSC 发送该组呼小区的第二次指配请求的同时,进一步包括: MSC启动定时 器 T1 ;
则所述收到指配结果 /失败消息为: 定时器 T1超时前收到指配结果 / 失败消息; 所述未收到响应消息为: 定时器 T1超时且未收到指配结果 / 失败消息。
7、 根据权利要求 1所述的方法, 其特征在于, 所述 MSC为主持移 动交换中心 A-MSC或转发移动交换中心 R-MSC。
8、 根据权利要求 1至 7任一项所述的方法, 其特征在于, BSC中 设置用于保存对所收到的指配请求的处理结果的指配情况记录, 所述 BSC返回指配请求的响应消息的处理流程包括:
A、 BSC收到所属 MSC的指配请求,根据所收到的指配请求检索指 配情况记录, 如果在指配情况记录中检索到对相同的指配请求的处理结 果, 则进一步判断指配情况记录中对该指配请求的处理结果是否为成 功, 若是则执行步骤 B, 否则执行步骤 C; 若未检索到处理结果则转至 步骤 D;
步骤 B: BSC根据从指配情况记录中检索到处理结果生成对应的指 配结果消息, 并将所生成的指配结果消息返回所属 MSC并结束 BSC处 理流程;
步骤 C: BSC根据所收到指配请求, 为相应的组呼小区指配組呼信 道,指配成功则向所属 MSC返回指配结果消息,指配失败则向所属 MSC 返回指配失败消息, 执行完毕后结束 BSC处理流程;
步骤 D: BSC根据所收到指配请求, 为相应的组呼小区指配组呼信 道,指配成功则向所属 MSC返回指配结果消息,指配失败则向所属 MSC 返回指配失败消息, 并将处理结果存储在本地的指配情况记录中, 执行 完毕后结束 BSC处理流程。
9、 根据权利要求 1至 7任一项所述的方法, 其特征在于, MSC中 设置用于保存所收到的来自 BSC的指配处理结果的指配情况记录;
则所述 MSC将该组呼小区接入本次组呼之前, 进一步包括: MSG 查找已存储的指配情况记录中是否有与所收到消息相同组呼 小区标识、 相同组呼标识的记录, 若没有, 则生成包括所收到消息的組 呼小区标识、 组呼标识以及指配结果的一条指配情况记录并执行后续步 骤; 若有, 则进一步判断指配情况记录中的处理结果, 若指配情况记录 中的处理结果为指配失败, 则将指配结果消息中组呼小区标识对应的 'J、 区加入本次组呼中, 将指配情况记录中的处理结果改为指配成功, 并执 行后续步骤。
10、 一种移动交换中心 MSC, 其特征在于, 包括如下模块: 响应消息判断模块, 用于判断在指配模块发出第一次指配请求后, 是否收到来自 BSC的响应消息,若没收到则向指配请求收发模块发出发 送第二次指配请求的通知;
指配请求收发模块,用于向 BSC发送特定组呼小区的第一次指配请 求, 以及根据来自响应消息判断模块的通知向 BSC发送第二次指配请 求; 还用于接收来自 BSC的指配请求的响应消息;
组呼接入模块, 用于在指配请求收发模块收到指配结果消息后, 将 该指配结果消息相应的组呼小区接入組呼。
11、 根据权利要求 10所述的 MSC, 其特征在于, 所述响应消息判 断模块进一步包括第一定时器单元, 用于在所述指配请求收发模块发送 第一次指配请求的同时, 启动与所述第一次指配请求对应的定时器 T2; 则所述响应消息判断模块判断是否收到来自 BSC的响应消息为:判 断在所述定时器 T2超时前是否收到第一次指配请求的响应消息。
12、根据权利要求 10所述的 MSC, 其特征在于, 所述 MSC进一步 包括组呼拆除模块, 所述响应消息判断模块进一步用于判断指配请求收 发模块在发出第二次指配请求后, 是否收到指配失败消息或未收到响应 消息, 若是则通知組呼拆除模块; 所述组呼拆除模块用于根据响应消息判断模块的通知, 拆除相应组 呼小区的连接。
13、 根据权利要求 10所述的 MSC, 其特征在于, 所述响应消息判 断模块进一步包括第二定时单元, 用于在所述指配请求收发模块发送第 二次指配请求的同时, 启动与所述第二次指配请求对应的定时器 T1 ; 则所述响应消息判断模块判断是否收到指配失败消息包括: 响应消 息判断模块判断在所述定时器 T1超时之前, 指配请求收发模块收到指 配失败消息;
所述响应消息判断模块判断未收到响应消息为: 响应消息判断模块 判断定时器 T1超时且指配请求收发模块未收到指配结果消息或指配失 败消息。
14、 根据权利要求 10至 13任一项所述的 MSC, 其特征在于, 所述 MSC进一步包括:
指配情况记录模块, 用于保存对所收到的指配请求的处理结果的指 配情况记录;
指配情况检索模块, 用于当指配请求收发模块收到指配结果消息或 指配失败消息后, 检索指配情况记录模块已保存的处理结果的指配情况 记录, 根据检索情况更新或修改相应的指配情况记录; 并通知组呼接入 模块将所述指配结果消息对应的組呼小区接入组呼, 或者通知组呼拆除 模块将断开所述指配失败消息对应的組呼小区的连接。
15、 一种 BSC, 其特征在于, 所述 BSC包括:
指配情况记录模块, 用于保存对所收到的指配请求的处理结果的指 配情况记录;
指配情况检索模块, 用于当 BSC收到所属 MSC的指配请求, 根据 所收到的指配请求检索指配情况记录模块已保存的处理结果的指配情 况记录, 并将检索结果通知信道指配模块, 若检索结果为指配成功, 则 直接向所属 MSC返回指配结果消息;
信道指配模块, 用于根据来自指配情况检索模块的通知, 为相应的 组呼小区指配信道, 根据指配结果向本 BSC所属 MSC返回指配成功消 息或指配失败消息。
PCT/CN2007/001085 2006-04-13 2007-04-03 Procédé pour l'accès à une cellule d'appel de groupe et centre de commutation mobile et contrôleur de station de base associé WO2007118408A1 (fr)

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WO2000069185A2 (en) * 1999-05-10 2000-11-16 Ericsson, Inc. Methods and systems for providing group calls with reduced setup times
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