WO2010118695A1 - 一种本地交换的建立及拆除方法 - Google Patents

一种本地交换的建立及拆除方法 Download PDF

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Publication number
WO2010118695A1
WO2010118695A1 PCT/CN2010/071799 CN2010071799W WO2010118695A1 WO 2010118695 A1 WO2010118695 A1 WO 2010118695A1 CN 2010071799 W CN2010071799 W CN 2010071799W WO 2010118695 A1 WO2010118695 A1 WO 2010118695A1
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bts
rate
acs
cacs
base station
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PCT/CN2010/071799
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English (en)
French (fr)
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罗小冬
唐雪
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中兴通讯股份有限公司
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Publication of WO2010118695A1 publication Critical patent/WO2010118695A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W76/00Connection management
    • H04W76/10Connection setup

Definitions

  • the present invention relates to the field of mobile communication technologies, and in particular, to a method for establishing and removing local exchanges.
  • the mobile station In the Global System for Mobile Communications (GSM), the mobile station (MS) establishes a communication connection with the base station (Base Transceiver Station, BTS) through the air interface, and the BTS passes the ABIS interface and the base station controller (Base Station Controller).
  • the BSC is connected, and the BSC interacts with the Mobile Switch Center (MSC) through the A port.
  • the Transcode Rate Adapter Unit (TRAU) is a conversion process for the speech algorithm codec on the BSC side. This process is performed by the Transcoder (TC).
  • the TC In the uplink direction, the TC converts the compressed data of the BTS into Pulse Code Modulation (PCM) voice to the MSC side through decoding.
  • PCM Pulse Code Modulation
  • the TC converts the PCM voice into compressed data by encoding into the BTS, and the BTS Pass to the MS.
  • LS Local Switch
  • the Adaptive Multi-Rate (AMR) speech algorithm is an adaptively adjusted speech algorithm introduced by GSM.
  • the MS and BTS can adjust the rate based on the detected wireless signal quality. If the quality of the wireless signal is detected to be good, the MS or BTS will adjust to the higher rate in the Active Codec Set (ACS); if the quality of the wireless signal is detected to be worse, the MS or BTS will be lower in the ACS. Primary rate adjustment.
  • the ACS can contain up to 4 levels of rate.
  • the Common Active Codec Set is a set of public ACSs of the calling party and the called party of the call.
  • the BTS needs to interact with the rate in the CACS when performing local exchange.
  • the current rate of the calling party and the called party may not be in the CACS, and there are still many state transition processes during the call, such as the BSC request when the calling party and the called party are performing non-local switching operations.
  • Local exchange is performed, and the rate of both the calling and the called parties is adjusted on the respective ACS.
  • the rate of use is not in the CACS. In this case, there will be no sound in the call.
  • cell handover may bring the same problem.
  • the terminal currently performing local switching switches to another cell and the original serving cell of the terminal does not coincide with the CACS of the switched cell, which may also cause a problem of call disconnection.
  • the present invention provides a method for establishing and dismantling a local exchange, which is caused by a different transfer from a non-local exchange process to a local exchange process, or when a cell handover occurs in a terminal during a local exchange process, because the ACS of the calling and called parties of the call is different. Intermittent call problems.
  • a local exchange establishment method of the present invention includes: updating a base station BTS to be locally switched and an activation rate set ACS of the terminal MS to a common activation rate set CACS;
  • the step of updating the ACS of the BTS to be exchanged with the MS of the MS to the CACS may include: the BSC separately updates the ACS of the BTS to be locally switched to the CACS, and the BTS separately updates the ACS of the MS to be locally exchanged to the ACS of the MS to be locally exchanged.
  • CACS CACS.
  • the BSC updates the ACS of the BTS to the CACS by sending a rate change message to the BTS.
  • the BTS updates the ACS of the respective local exchange MS to the CACS by sending an adaptive multi-rate AMR rate configuration message to the respective MSs to be locally switched.
  • the method may further include: updating the ACS of the BTS and the MS to be locally exchanged to
  • the rate used by the MS to be locally switched is limited to any rate in the CACS.
  • Any rate in the CACS can be an initial rate ICM.
  • the method may further include limiting the rate of use of the BTS to be locally switched to any rate in the CACS before limiting the rate used by the MS to be locally switched to any rate in the CACS;
  • the rate used by the MS is limited to the same rate as the rate used by the corresponding BTS.
  • the method may also have the following features:
  • the step of limiting the rate of use of the BTS to be locally switched to any rate in the CACS includes:
  • the BSC sends a rate control message to the BTS to be locally switched to limit the rate used by the BTS to any rate in the CACS;
  • the step of limiting the rate used by the MS to be locally switched to any rate in the CACS includes: the BTS sends a rate mode command to the respective MS to be locally switched.
  • the CMC limits the rate used by the respective MS to be locally switched. It is at the same rate as the BTS itself.
  • the step of limiting the rate of the BTS to be used for local switching to any rate in the CACS may include: In the local switching process, if any MS switches, the BTS sends a rate mode request CMR to the peer BTS, and the peer end The rate of the BTS is limited to any rate in the CACS.
  • the invention also provides a method for removing a local exchange, comprising:
  • the BSC updates the locally exchanged BTS and MS ACS to be removed to the initial ACS of the BTS saved in the BSC;
  • the BSC removes the user plane resources of the local exchange to be removed.
  • the steps for the BSC to update the ACS of the BTS and the MS to the initial ACS may include:
  • the BSC updates the ACS of the locally switched BTS to be de-removed to the initial ACS by sending a rate change message to the BTS, and the BTS sends the AMR rate configuration message to the respective local exchanged MS to be removed to send the respective local to be removed.
  • the ACS of the exchanged MS is updated to the initial ACS.
  • the present invention also provides a base station controller supporting local exchange establishment, the base station controller being configured to:
  • the base station controller is configured to update the ACS of the BTS and the MS to be locally switched to the CACS by:
  • the base station controller sends a rate change message to the BTS to be locally switched to update the ACS of the BTS to the CACS; and the BTS sends an adaptive multi-rate AMR rate configuration to each MS to be locally switched.
  • the message updates the ACS of the respective MS to be locally switched to the CACS.
  • the present invention further provides a base station controller supporting local exchange teardown, the base station controller being configured to: update an ACS of a locally switched base station BTS to be removed and a terminal MS to the BTS saved in the base station controller Initial ACS;
  • the user plane resources of the local exchange to be removed are removed.
  • the base station controller is configured to update the ACS of the BTS and the MS to be detached to the initial ACS of the BTS saved in the base station controller by:
  • the base station controller updates the ACS of the BTS to be locally switched to the initial ACS by sending a rate change message to the BTS, respectively, and the BTS sends the adaptation to the respective locally exchanged MS to be removed.
  • the multi-rate AMR rate configuration message updates the ACS of the respective locally switched MS to be removed to the initial ACS.
  • the present invention restricts the rate used by the BTS and the MS to the same specified rate through the information exchange between the BSC and the BTS, and then updates the ACS of the BTS and the MS to the CACS of both parties, and establishes a BTS link of the local switching parties. Connection, the two sides adjust the rate on the CACS, so that there is no problem of voice interruption during the local exchange process.
  • 1 is an interaction diagram of a message when a non-local exchange is transferred from a local exchange to a local exchange;
  • FIG. 2 is an interaction diagram of a message when a local exchange is established after a terminal performs cell handover in the local exchange process of the present invention
  • FIG. 3 is an interaction diagram of messages when the local exchange is removed according to the present invention. Preferred embodiment of the invention
  • the present invention transmits a rate control message to a BTS to be locally switched, and sends a rate control message to a BTS to be locally exchanged, from the non-local exchange to the local exchange, or during the local exchange process, and the BSC sends a rate control message to the BTS to be locally exchanged.
  • the rate used by the BTS is limited to any rate in the CACS, such as the Initial Codec Mode (ICM).
  • the BTS of the calling and called parties sends a Rate Mode Command (CMC) to the respective MS, and limits the rate used by the MS to the same rate.
  • the BSC sends a MutiRate Codec Configuration Change message to the BTS, and the BTS is sent.
  • the ACS is updated to CACS, and the BTSs of the calling and calling parties send an AMR-CONFIG-REQ message to the MS, and the ACS of the MS is updated to CACS, and the BSC establishes a local switching link of the BTS of the calling and calling parties.
  • the present invention sends a rate change message to the BTS of the calling and called parties through the BSC, and the ACS of the BTS is used by the CACS. After the rate change message is received, the BTS sends an AMR rate configuration message to the MS to configure the rate set of the MS as the initial ACS.
  • the method of the present invention is described by taking the scenario in which the MSC initiates a local exchange after the completion of the supplementary service by the MS1 and the MS2.
  • the method for establishing the LS is as shown in FIG.
  • Step 101 The MSC finds that the supplementary service is completed, and the two parties of the session belong to one BSC, and the MSC sends a local exchange request to the BSC of the same session, and carries the local paging identifier in the local exchange request.
  • Step 102 The BSC searches for the voice algorithm used by the BTSs of the two parties according to the local paging identifier carried in the received local exchange request. If both parties of the session use the AMR algorithm, step 103 is performed; otherwise, the process ends;
  • Step 103 The BSC calculates the CACS according to the AMR voice algorithm used by the two parties in the session.
  • the ICM is the lowest rate in the CACS, and the BSC preferably limits the rate at which BTS1 is used to ICM, and may also be limited to any other rate in the CACS.
  • Step 105 After the rate limit is completed, the BTS1 sends a CMC to the MS1 to limit the rate used by the MS1 to the ICM.
  • Step 106 The BSC sends a rate control message to the BTS2, informing the BTS2 to limit the rate used to the ICM, and the BTS2 performs the rate limiting operation.
  • the BSC can also limit the ACS of BTS2 to any other rate in the CACS.
  • Step 107 After the rate limiting is completed, the BTS2 sends a CMC to the MS2 to limit the rate used by the MS2 to the ICM;
  • the foregoing step 104 107 limits the rate used by the BTS1, the MS1, the BTS2, and the MS2 to the ICM.
  • the ACS of the BTS1, MS1, BTS2, and MS2 is updated to the CACS in the following steps, there is a delay due to the update of the BTS and the MS.
  • the MS communicates with the BTS using the rate contained in its ACS but not included in the CACS, so that the BTS cannot support the rate, resulting in an error.
  • Step 108 The BSC sends a rate change message to the BTS1 to update the ACS of the BTS1 to the CACS.
  • Step 110 The BSC sends a rate change message to the BTS2 to update the ACS of the BTS2 to the CACS.
  • Step 111 After completing the ACS update, the BTS2 sends an AMR rate configuration message to the MS2, and updates the ACS of the MS2 to the CACS.
  • Step 112 The BSC establishes a local switched link connection between the BTS1 and the BTS2, and the BTS1 and the BTS2 perform local exchange on the CACS, and the MS1 and the MS2 make a call;
  • Step 113 The BSC sends a response message of the local exchange request to the MSC, and removes the user plane.
  • Related resources such as TC, etc.
  • the MSC removes and releases the related A port resources.
  • MS1 switches to the same BSC.
  • the AMR algorithm is used for local exchange as an example to illustrate the method of the present invention. As shown in FIG. 2, the following steps are included:
  • Step 201 The BSC receives the measurement report of the BTS1, and learns that the MS1 needs to perform cell handover, and determines that the handover to the BTS3 is performed;
  • Step 202 The BSC sends a rate control message to the BTS1, informing the BTS1 to limit the rate used to the ICM, and the BTS1 performs the rate limiting operation.
  • the rate mode request (CMR) sent from BTS2 to BTS1 can also be used to limit the rate used by BTS1 to ICM.
  • the CMR sent by BTS1 to BTS1 can also be used at the same time to limit the BTS1 rate.
  • Step 203 After the rate limiting is completed, the BTS1 sends the CMC to the MS1, and limits the rate used by the MS1 to the ICM.
  • Step 204 The BSC sends a rate control message to the BTS2, informing the BTS2 to limit the rate used to the ICM, and the BTS2 performs the rate limiting operation.
  • the rate of BTS2 usage can also be limited to ICM through the CMR sent by BTS1 to BTS2.
  • Step 205 After the rate limiting is completed, the BTS2 sends the CMC to the MS2, and limits the rate used by the MS2 to the ICM.
  • Step 206 The BSC sends a channel activation message to the BTS3, and the BTS3 performs channel activation, and The rate used is limited to ICM;
  • Step 207 The BTS3 returns a channel activation response message to the BSC, and notifies the BSC that the channel is activated.
  • Handover CMD handover command
  • Step 209 After receiving the handover command, the MS 1 sends a handover access to the BTS3 (Handover
  • Step 210 The BTS3 sends a Handover Detect to the BSC to notify the BSC that the MSI is connected.
  • Step 211 After receiving the handover detection, the BSC sends a rate change message to the BTS3, and updates the ACS of the BTS3 to the CACS.
  • Step 212 After completing the ACS update, the BTS3 sends an AMR rate configuration message to the MS1, and updates the ACS of the MS1 to the CACS.
  • Step 213 The BSC sends a rate change message to the BTS2 to update the ACS of the BTS2 to the CACS.
  • Step 214 After completing the ACS update, the BTS2 sends an AMR rate configuration message to the MS2, and updates the ACS of the MS2 to the CACS.
  • Step 215 The BSC sends a local exchange request to the MSC.
  • Step 216 After receiving the local exchange request, the MSC finds that there is no supplementary service requirement, returns a local exchange request response to the BSC, and does not perform the A port resource allocation;
  • Step 217 After receiving the local exchange request response sent by the MSC, the BSC establishes a local exchange link between BTS2 and BTS3, and MS1 and MS2 make a call, and BTS2 and BTS3 perform local exchange on the CACS.
  • the MSC finds that there is a supplementary service requirement or the handover fails to perform the local exchange, and the local exchange is removed.
  • the method includes the following steps: Step 301: The MSC finds that the local exchange needs to be removed. , pre-allocating the A port; Step 302: The MSC sends a local exchange teardown command to the BSC, in the local exchange teardown command Carry a local paging identifier;
  • Step 303 After receiving the local exchange teardown command, the BSC searches for a call to be removed according to the local paging identifier, and allocates a TC resource for the call.
  • Step 304 The BSC sends a rate change message to the BTS (BTS1) of one of the locally exchanged, and updates the ACS of the BTS1 to the initial ACS of the BTS1 saved in the BSC;
  • BTS1 BTS1 of one of the locally exchanged
  • Step 305 After receiving the rate change message, the BTS1 sends an AMR rate configuration message to the MS1, and updates the ACS of the MS1 to the initial ACS of the BTS1.
  • BTS1 and MS1 will perform rate adjustments in the initial ACS.
  • Step 306 The BSC sends a rate change message to the BTS (BTS2) of the other party that is locally switched, and updates the ACS of the BTS2 to the initial ACS of the BTS2 saved in the BSC;
  • BTS2 BTS2
  • Step 307 After receiving the rate change message, the BTS2 sends an AMR rate configuration message to the MS2, and updates the ACS of the MS2 to the initial ACS of the BTS2.
  • BTS2 and MS2 will perform rate adjustments in the initial ACS.
  • Step 308 The BSC removes the locally exchanged user plane resources.
  • BTS1 and BTS2 will no longer perform data interaction.
  • Step 309 The BSC sends a local exchange teardown command response to the MSC to notify the MSC that the relevant resources have been completely exchanged for local removal.
  • a base station controller supporting local exchange establishment the base station controller is configured to: update an activation rate set ACS of a base station BTS and a terminal MS to be locally switched to a common activation rate set CACS; The link connection of the locally switched BTS.
  • the base station controller is configured to update the ACS of the BTS and the MS to be locally switched to CACS by:
  • the base station controller sends a rate change message to the BTS to be locally switched to the BTS
  • the ACS is updated to the CACS; the BTS then separately sends an adaptive multi-rate AMR rate configuration message to the respective MS to be locally switched to the respective ACS of the MS to be locally switched. Updated to the CACS.
  • a base station controller supporting the local exchange teardown is configured to: update the ACS of the locally switched base station BTS and the terminal MS to be removed to the BTS saved in the base station controller Initial ACS;
  • the user plane resources of the local exchange to be removed are removed.
  • the base station controller is configured to update the ACS of the BTS and the MS to be removed to the initial ACS of the BTS saved in the base station controller by:
  • the base station controller updates the ACS of the BTS to be locally switched to the initial ACS by sending a rate change message to the BTS, respectively, and the BTS sends an adaptive multi-rate to each of the locally switched MSs to be removed respectively.
  • the AMR Rate Configuration message updates the ACS of the respective locally switched MS to be removed to the initial ACS.
  • the present invention limits the rate used by the BTS and the MS to the same specified rate through the information exchange between the BSC and the BTS, and then updates the ACS of the BTS and the MS to the CACS of both parties, and establishes the BTS of the local switching parties.
  • the link is connected, and the two parties perform rate adjustment on the CACS, so that the problem of voice discontinuity does not occur during the local exchange process.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

本发明提供一种本地交换的建立和拆除方法及基站,所述本地交换的建立方法包括:将待进行本地交换的基站BTS与终端MS的激活速率集合ACS更新为公共的激活速率集合CACS;建立所述待进行本地交换的BTS的链路连接,所述MS进行通话。所述本地交换的拆除方法包括:基站控制器BSC将待拆除的本地交换的基站BTS与终端MS的激活速率集合ACS更新为所述BSC中保存的所述BTS的初始ACS;所述BSC拆除所述待拆除的本地交换的用户面资源。本发明的方法和基站控制器使得在本地交换过程中不会出现语音断续的问题。

Description

一种本地交换的建立及拆除方法
技术领域
本发明涉及移动通信技术领域, 尤其涉及一种本地交换的建立及拆除方 法。
背景技术
在全球移动通讯系统 ( Global System for Mobile Communications , GSM ) 中, 终端 ( Mobile Station, MS )通过空口与基站( Base Transceiver Station, BTS )建立通信连接, BTS通过 ABIS接口与基站控制器( Base Station Controller BSC )连接, BSC与移动交换中心 (Mobile Switch Center, MSC )通过 A口 进行交互。 码型变换和速率适配(Transcode Rate Adapter Unit, TRAU )是位 于 BSC侧进行语音算法编解码的转换过程,该过程由编解码单元( Transcoder, TC ) 完成。 在上行方向, TC通过解码将 BTS的压缩数据转化成脉冲编码调 制 (Pulse Code Modulation, PCM )语音送到 MSC侧, 在下行方向, TC将 PCM语音通过编码转化成压缩数据传递给 BTS, BTS再传递给 MS。
本地交换( Local Switch, LS )是指当一个呼叫的主叫方和被叫方同属于 一个 BSC, 并且语音算法相容时, 直接在主叫方和被叫方所属的 BTS之间进 行语音的数据交换, 而不再通过 MSC, 从而节省了 TRAU资源以及 A口资 源, 并且语音质量也能得到相应的提高。
自适应多速率( Adaptive Multi-Rate, AMR )语音算法是 GSM引入的一 种自适应调整的语音算法。 在使用 AMR算法时, MS和 BTS能够根据检测 的无线信号质量进行速率调整。 如果检测到无线信号质量比较好, MS 或者 BTS将在激活速率集合(Active Codec Set, ACS ) 中往高一级速率调整; 如 果检测到无线信号质量变差, MS或者 BTS将在 ACS中往低一级速率调整。 ACS中最多包含 4级速率。
公共的激活速率集合( Common Active Codec Set, CACS )是呼叫的主叫 方和被叫方的公共 ACS的集合, CACS的计算参见 3GPP28062中第 11 , 12 章节。 BTS在进行本地交换时需要釆用 CACS中的速率进行交互。 实际中主 叫方和被叫方的当前速率可能并不在 CACS中, 并且, 在通话过程中还存在 着很多状态迁移过程, 如主叫方和被叫方在进行非本地交换操作时, BSC要 求进行本地交换, 而此时主被叫双方的速率都在各自的 ACS上进行调整, 正 在使用的速率有可能不在 CACS中, 在这种情况下, 将会出现通话无声音的 问题。
同样, 小区切换也可能带来同样的问题, 如, 当前进行本地交换的终端 切换到另外一个小区, 而终端的原服务小区与切换到的小区的 CACS并不一 致, 也会造成通话间断的问题。
发明内容
本发明提供一种本地交换的建立及拆除方法, 解决从非本地交换过程转 移到本地交换过程, 或在本地交换过程中终端发生小区切换时, 由于通话的 主被叫双方的 ACS不同, 造成的通话断续问题。
为解决上述技术问题, 本发明的一种本地交换的建立方法, 包括: 将待进行本地交换的基站 BTS与终端 MS的激活速率集合 ACS更新为公 共的激活速率集合 CACS;
建立待进行本地交换的 BTS的链路连接, MS进行通话。
将待进行本地交换的 BTS与 MS的 ACS更新为 CACS的步骤可包括: BSC分别将待进行本地交换的 BTS的 ACS更新为 CACS, BTS再分别 将各自的待进行本地交换的 MS的 ACS更新为 CACS。
BSC通过向 BTS发送速率更改消息将 BTS的 ACS更新为 CACS, BTS 通过向各自的待进行本地交换的 MS发送自适应多速率 AMR速率配置消息 将各自的待进行本地交换 MS的 ACS更新为 CACS。
所述方法还可包括: 在将待进行本地交换的 BTS与 MS的 ACS更新为
CACS之前, 将待进行本地交换的 MS使用的速率限制为 CACS中的任一速 率。
所述 CACS中的任一速率可为初始速率 ICM。 所述方法还可包括:在将待进行本地交换的 MS使用的速率限制为 CACS 中的任一速率之前,将待进行本地交换的 BTS使用的速率限制为 CACS中的 任一速率; 其中,
在将待进行本地交换的 MS使用的速率限制为所述 CACS中的任一速率 的步骤中,所述 MS使用的速率是限制为与相应 BTS使用的速率相同的速率。
所述方法还可具有以下特点: 将待进行本地交换的 BTS使用的速率限制 为 CACS中的任一速率的步骤包括:
BSC向待进行本地交换的 BTS发送速率控制消息将所述 BTS使用的速 率限制为 CACS中的任一速率;
将待进行本地交换的 MS使用的速率限制为 CACS中的任一速率的步骤 包括: BTS向各自的待进行本地交换的 MS发送速率模式命令 CMC将各自 的待进行本地交换的 MS使用的速率限制为与所述 BTS自身相同的速率。
将待进行本地交换的 BTS使用的速率限制为 CACS中的任一速率的步骤 可包括: 在本地交换过程中, 若任一 MS发生切换, BTS向对端 BTS发送速 率模式请求 CMR, 将对端 BTS的速率限制为 CACS中的任一速率。
本发明还提供一种本地交换的拆除方法, 包括:
BSC将待拆除的本地交换的 BTS与 MS的 ACS更新为 BSC中保存的 BTS 的初始 ACS;
BSC拆除待拆除的本地交换的用户面资源。
BSC将 BTS与 MS的 ACS更新为初始 ACS的步骤可包括:
BSC通过分别向 BTS发送速率更改消息将待拆除的本地交换的 BTS的 ACS更新为初始 ACS , BTS再通过分别向各自的待拆除的本地交换的 MS发 送 AMR速率配置消息将各自的待拆除的本地交换的 MS的 ACS更新为初始 ACS。
本发明还提供一种支持本地交换建立的基站控制器, 所述基站控制器设 置成:
将待进行本地交换的基站 BTS和终端 MS的激活速率集合 ACS更新为公 共的激活速率集合 CACS; 以及建立待进行本地交换的 BTS的链路连接。 如上所述的基站控制器, 所述基站控制器是设置成通过如下方式将待进 行本地交换的 BTS和 MS的 ACS更新为 CACS:
所述基站控制器向待进行本地交换的 BTS发送速率更改消息将所述 BTS 的 ACS更新为所述 CACS; 所述 BTS再分别向各自的待进行本地交换的 MS 发送自适应多速率 AMR速率配置消息将各自的待进行本地交换的 MS 的 ACS更新为所述 CACS。
本发明还一种支持本地交换拆除的基站控制器 ,所述基站控制器设置成: 将待拆除的本地交换的基站 BTS与终端 MS的 ACS更新为所述基站控制器中 保存的所述 BTS的初始 ACS;
拆除所述待拆除的本地交换的用户面资源。
如上所述的基站控制器, 所述基站控制器是设置成通过如下方式将待拆 除的 BTS与 MS的 ACS更新为所述基站控制器中保存的所述 BTS的初始 ACS:
所述基站控制器通过分别向所述 BTS发送速率更改消息将待进行本地交 换的 BTS的 ACS更新为所述初始 ACS, 所述 BTS再通过分别向各自的待拆 除的本地交换的 MS发送自适应多速率 AMR速率配置消息将各自的待拆除 的本地交换的 MS的 ACS更新为所述初始 ACS。综上所述,本发明通过 BSC 和 BTS的信息交互, 将 BTS和 MS使用的速率限制为同一指定速率, 再将 BTS和 MS的 ACS更新为双方的 CACS,建立本地交换双方的 BTS的链路连 接, 双方在 CACS上进行速率调整, 使得在本地交换过程中不会出现语音断 续的问题。
附图概述
图 1为本发明从非本地交换转移到本地交换时消息的交互图;
图 2为本发明本地交换过程中一终端进行小区切换后建立本地交换时消 息的交互图;
图 3为本发明拆除本地交换时的消息的交互图。 本发明的较佳实施方式
本发明对于从非本地交换转移到本地交换, 或在本地交换过程中, 终端 发生小区切换产生的通话断续问题,釆用 BSC向待进行本地交换的 BTS发送 速率控制消息,将主被叫双方的 BTS使用的速率限制在 CACS中的任一速率, 如初始速率(Initial Codec Mode, ICM ) 。 主被叫双方的 BTS向各自的 MS 发送速率模式命令 ( Codec Mode Command, CMC ) , 将 MS使用的速率限制 为与其相同的速率, BSC向 BTS发送速率更改( MutiRate Codec Configuration Change ) 消息, 将 BTS的 ACS更新为 CACS, 主被叫双方的 BTS向 MS发 送 AMR速率配置( AMR— CONFIG— REQ )消息,将 MS的 ACS更新为 CACS , BSC建立主被叫双方 BTS的本地交换链路。
对于在本地交换过程中, 由于切换或者补充业务的原因, 需要将本地交 换拆除,转换为非本地交换时,本发明通过 BSC向主被叫双方的 BTS发送速 率更改消息, 将 BTS的 ACS由 CACS还原为初始 ACS, BTS接收到速率更 改消息后,向 MS发送 AMR速率配置消息,将 MS的速率集配置为初始 ACS。
下面结合附图对本发明的具体实施方式进行说明。
实施例 1 :
下面以 MS1与 MS2在完成补充业务后, MSC发起本地交换的场景为例 对本发明的方法进行说明, 图 1所示为建立 LS的方法, 包括如下步骤:
步骤 101 : MSC发现补充业务已完成,并且会话双方同属一个 BSC, MSC 向会话双方同属的 BSC发送本地交换请求, 在该本地交换请求中携带本地寻 呼标识;
步骤 102: BSC根据接收到的本地交换请求中携带的本地寻呼标识, 查 找会话双方的 BTS使用的语音算法, 若会话双方均釆用 AMR算法, 则执行 步骤 103; 否则, 结束;
步骤 103: BSC根据会话双方使用的 AMR语音算法, 计算得到 CACS; 步骤 104: BSC向 BTS1发送速率控制消息, 通知 BTS1将使用的速率限 制为 ICM, BTS1进行限制速率的操作; ICM为 CACS中的最低速率, BSC优选将 BTS1使用的速率限制为 ICM, 也可以限制为 CACS中的任一其它速率。
步骤 105: 完成速率限制后, BTS1向 MS1发送 CMC将 MS1使用的速 率限制为 ICM;
步骤 106: BSC向 BTS2发送速率控制消息, 通知 BTS2将使用的速率限 制为 ICM, BTS2进行限制速率的操作;
与 BTS1类似, BSC也可以将 BTS2的 ACS限制为 CACS中的任一其它 速率。
步骤 107: 完成速率限制后, BTS2向 MS2发送 CMC将 MS2使用的速 率限制为 ICM;
上述步骤 104 107将 BTS1、MS1、BTS2和 MS2使用的速率限制为 ICM, 可以避免下述步骤中将 BTS1、 MS1、 BTS2和 MS2的 ACS更新为 CACS时, 由于 BTS与 MS的更新存在时延,导致已完成对 BTS的更新而未对 MS更新 时, MS使用包含在其 ACS中而未包含在 CACS中的速率与 BTS进行通信, 以致 BTS无法支持该速率, 产生错误。
当然, 为避免对 BTS下的其他 MS造成影响, 也可以仅将待进行本地交 换的 MS使用的速率限制为 ICM,而不对 BTS进行限制。可以通过在步骤 104 的速率控制消息中增加一位表示是否需要对 BTS进行限制。对 BTS进行速率 限制可以使通信更加稳定。
步骤 108: BSC向 BTS1发送速率更改消息,将 BTS1的 ACS更新为 CACS; 步骤 109: BTS1完成 ACS更新后, 向 MS1发送 AMR速率配置消息, 将 MS1的 ACS更新为 CACS;
步骤 110: BSC向 BTS2发送速率更改消息,将 BTS2的 ACS更新为 CACS; 步骤 111 : BTS2完成 ACS更新后, 向 MS2发送 AMR速率配置消息, 将 MS2的 ACS更新为 CACS;
步骤 112: BSC建立 BTS1与 BTS2的本地交换的链路连接, BTS1与 BTS2 在 CACS上进行本地交换, MS1与 MS2进行通话;
步骤 113: BSC向 MSC发送本地交换请求的响应消息, 并拆除用户面的 相关资源 (如 TC等) , MSC收到本地交换请求的响应消息后, 拆除释放相 关的 A口资源。
实施例 2:
下面以 MS1与 MS2进行本地交换的过程中, MS1切换到同一 BSC下的
BTS3 ,切换后仍釆用 AMR算法进行本地交换为例对本发明的方法进行说明, 如图 2所示, 包括如下步骤:
步骤 201 : BSC接收到 BTS1的测量报告,获知 MS1需要进行小区切换, 并判断出切换到 BTS3;
步骤 202: BSC向 BTS1发送速率控制消息, 通知 BTS1将使用的速率限 制为 ICM, BTS1进行限制速率的操作;
由于切换前 BTS1与 BTS2进行本地交换, 因此, 在此也可以通过 BTS2 向 BTS1发送的速率模式请求( Codec Mode Request, CMR ) , 将 BTS1使用 的速率限制在 ICM。
为确保 BTS1的速率限制, 也可以同时釆用步骤 202以及 BTS2向 BTS1 发送的 CMR, 实现对 BTS1速率的限制。
步骤 203: 完成速率限制后, BTS1向 MS1发送 CMC, 将 MS1使用的速 率限制为 ICM;
步骤 204: BSC向 BTS2发送速率控制消息, 通知 BTS2将使用的速率限 制为 ICM, BTS2进行限制速率的操作;
类似地, 也可以通过 BTS1向 BTS2发送的 CMR, 将 BTS2使用的速率 限制在 ICM。
为确保 BTS2的速率限制, 也可以同时釆用步骤 204以及 BTS1向 BTS2 发送的 CMR, 实现对 BTS2速率的限制。
步骤 205: 完成速率限制后, BTS2向 MS2发送 CMC, 将 MS2使用的速 率限制为 ICM;
步骤 206: BSC向 BTS3发送信道激活消息, BTS3进行信道激活, 并将 使用的速率限制为 ICM;
步骤 207: BTS3向 BSC返回信道激活响应消息, 通知 BSC信道已激活; 步骤 208: BSC接收到信道激活响应消息后, 向 MS1 发送切换命令 ( Handover CMD ) ;
步骤 209: MS 1接收到切换命令后, 向 BTS3发送切换接入( Handover
Access ) , 请求接入 BTS3 , BTS3接入 MSI ;
步骤 210: BTS3向 BSC发送切换检测( Handover Detect ) ,通知 BSC MSI 已接入;
步骤 211 : BSC接收到切换检测后,向 BTS3发送速率更改消息,将 BTS3 的 ACS更新为 CACS;
步骤 212: BTS3完成 ACS更新后, 向 MS1发送 AMR速率配置消息, 将 MS1的 ACS更新为 CACS;
步骤 213: BSC向 BTS2发送速率更改消息,将 BTS2的 ACS更新为 CACS; 步骤 214: BTS2完成 ACS更新后, 向 MS2发送 AMR速率配置消息, 将 MS2的 ACS更新为 CACS;
步骤 215: BSC向 MSC发送本地交换请求;
步骤 216: MSC接收到本地交换请求后,发现没有补充业务需求,向 BSC 返回本地交换请求响应, 且不进行 A口资源分配;
步骤 217: BSC接收到 MSC发送的本地交换请求响应后, 建立 BTS2与 BTS3的本地交换的链路, MS1与 MS2进行通话, BTS2与 BTS3在 CACS 上进行本地交换。
实施例 3:
下面以 MS1与 MS2进行本地交换时, MSC发现有补充业务需求或切换 导致无法进行本地交换, 拆除本地交换的方法, 如图 5所示, 包括如下步骤: 步骤 301 : MSC发现需要拆除本地交换时, 进行 A口的预分配; 步骤 302: MSC向 BSC发送本地交换拆除命令, 在本地交换拆除命令中 携带本地寻呼标识;
步骤 303: BSC接收到本地交换拆除命令后, 根据本地寻呼标识查找要 拆除的呼叫 , 为该呼叫分配 TC资源;
步骤 304: BSC向本地交换的其中一方的 BTS ( BTS1 )发送速率更改消 息, 将 BTS1的 ACS更新为 BSC中保存的 BTS1的初始 ACS;
步骤 305: BTS1接收到速率更改消息后, 向 MS1发送 AMR速率配置消 息, 将 MS1的 ACS更新为 BTS1的初始 ACS;
BTS1和 MS1将在初始 ACS中进行速率调整。
步骤 306: BSC向本地交换的另一方的 BTS ( BTS2 )发送速率更改消息, 将 BTS2的 ACS更新为 BSC中保存的 BTS2的初始 ACS;
步骤 307: BTS2接收到速率更改消息后, 向 MS2发送 AMR速率配置消 息, 将 MS2的 ACS更新为 BTS2的初始 ACS;
BTS2和 MS2将在初始 ACS中进行速率调整。
步骤 308: BSC拆除本地交换的用户面资源;
BTS1与 BTS2将不再进行数据交互。
步骤 309: BSC向 MSC发送本地交换拆除命令响应, 通知 MSC已完全 本地交换相关资源的拆除。
实施例 4:
本发明的一种支持本地交换建立的基站控制器,所述基站控制器设置成: 将待进行本地交换的基站 BTS和终端 MS的激活速率集合 ACS更新为公 共的激活速率集合 CACS; 以及建立待进行本地交换的 BTS的链路连接。
其中, 所述基站控制器是设置成通过如下方式将待进行本地交换的 BTS 和 MS的 ACS更新为 CACS:
基站控制器向待进行本地交换的 BTS发送速率更改消息将所述 BTS的
ACS更新为所述 CACS; 所述 BTS再分别向各自的待进行本地交换的 MS发 送自适应多速率 AMR速率配置消息将各自的待进行本地交换的 MS的 ACS 更新为所述 CACS。
本发的一种支持本地交换拆除的基站控制器, 所述基站控制器设置成: 将待拆除的本地交换的基站 BTS与终端 MS的 ACS更新为所述基站控制器中 保存的所述 BTS的初始 ACS;
拆除所述待拆除的本地交换的用户面资源。
其中, 所述基站控制器是设置成通过如下方式将待拆除的 BTS与 MS的 ACS更新为所述基站控制器中保存的所述 BTS的初始 ACS:
基站控制器通过分别向所述 BTS发送速率更改消息将待进行本地交换的 BTS的 ACS更新为所述初始 ACS, 所述 BTS再通过分别向各自的待拆除的 本地交换的 MS发送自适应多速率 AMR速率配置消息将各自的待拆除的本 地交换的 MS的 ACS更新为所述初始 ACS。
当然, 本发明还可有其他多种实施例, 在不背离本发明精神及其实质的 些相应的改变和变形都应属于本发明所附的权利要求的保护范围。
工业实用性
与现有技术相比, 本发明通过 BSC和 BTS的信息交互, 将 BTS和 MS 使用的速率限制为同一指定速率, 再将 BTS 和 MS 的 ACS 更新为双方的 CACS, 建立本地交换双方的 BTS的链路连接, 双方在 CACS上进行速率调 整, 使得在本地交换过程中不会出现语音断续的问题。

Claims

权 利 要 求 书
1、 一种本地交换的建立方法, 包括:
将待进行本地交换的基站 BTS与终端 MS的激活速率集合 ACS更新为公 共的激活速率集合 CACS;
建立所述待进行本地交换的 BTS的链路连接, 所述 MS进行通话。
2、 如权利要求 1所述的建立方法, 其中, 将待进行本地交换的 BTS与 MS的 ACS更新为 CACS的步骤包括:
基站控制器 BSC分别将所述待进行本地交换的 BTS的 ACS更新为所述 CACS, 所述 BTS再分别将各自的待进行本地交换的 MS的 ACS更新为所述 CACS。
3、 如权利要求 2所述的建立方法, 其中,
BSC分别将所述待进行本地交换的 BTS的 ACS更新为所述 CACS的步 骤中,所述 BSC是通过向所述待进行本地交换的 BTS发送速率更改消息将所 述 BTS的 ACS更新为所述 CACS;
所述 BTS 再分别将各自的待进行本地交换的 MS 的 ACS 更新为所述
CACS的步骤中: 所述 BTS是通过向各自的待进行本地交换的 MS发送自适 应多速率 AMR速率配置消息将各自的待进行本地交换的 MS的 ACS更新为 所述 CACS。
4、如权利要求 1、 2或 3所述的建立方法,其在将待进行本地交换的 BTS 与 MS的 ACS更新为 CACS的步骤之前还包括: 将待进行本地交换的 MS使 用的速率限制为所述 CACS中的任一速率。
5、 如权利要求 4所述的建立方法, 其中, 所述 CACS中的任一速率为初 始速率 ICM。
6、 如权利要求 4或 5所述的建立方法, 其在将待进行本地交换的 MS使 用的速率限制为所述 CACS中的任一速率的步骤之前还包括: 将所述待进行 本地交换的 BTS使用的速率限制为所述 CACS中的任一速率; 其中,
在将待进行本地交换的 MS使用的速率限制为所述 CACS中的任一速率 的步骤中,所述 MS使用的速率是限制为与相应 BTS使用的速率相同的速率。
7、 如权利要求 6所述的建立方法, 其中, 将所述待进行本地交换的 BTS 使用的速率限制为所述 CACS中的任一速率的步骤包括:
BSC向所述 BTS发送速率控制消息将所述 BTS使用的速率限制为所述 CACS中的任一速率;
将待进行本地交换的 MS使用的速率限制为所述 CACS中的任一速率的 步骤包括:
所述 BTS向各自的待进行本地交换的 MS发送速率模式命令 CMC将各 自的待进行本地交换的 MS使用的速率限制为与所述 BTS自身相同的速率。
8、 如权利要求 6所述的建立方法, 其中, 将所述待进行本地交换的 BTS 使用的速率限制为所述 CACS中的任一速率的步骤包括:在本地交换过程中, 若任一 MS发生切换, 所述 BTS向对端 BTS发送速率模式请求 CMR, 将对 端 BTS的速率限制在所述 CACS中的任一速率。
9、 一种本地交换的拆除方法, 包括:
基站控制器 BSC将待拆除的本地交换的基站 BTS与终端 MS的激活速率 所述 BSC拆除所述待拆除的本地交换的用户面资源。
10、 如权利要求 9所述的拆除方法, 其中, BSC将待拆除的本地交换的 括:
所述 BSC通过分别向所述 BTS发送速率更改消息将待进行本地交换的 BTS的 ACS更新为所述初始 ACS, 所述 BTS再通过分别向各自的待拆除的 本地交换的 MS发送自适应多速率 AMR速率配置消息将各自的待拆除的本 地交换的 MS的 ACS更新为所述初始 ACS。
11、 一种支持本地交换建立的基站控制器, 所述基站控制器设置成: 将待进行本地交换的基站 BTS和终端 MS的激活速率集合 ACS更新为公 共的激活速率集合 CACS; 以及建立待进行本地交换的 BTS的链路连接。
12、如权要求 11所述的基站控制器, 所述基站控制器是设置成通过如下 方式将待进行本地交换的 BTS和 MS的 ACS更新为 CACS:
所述基站控制器向待进行本地交换的 BTS发送速率更改消息将所述 BTS 的 ACS更新为所述 CACS; 所述 BTS再分别向各自的待进行本地交换的 MS 发送自适应多速率 AMR速率配置消息将各自的待进行本地交换的 MS 的 ACS更新为所述 CACS。
13、 一种支持本地交换拆除的基站控制器, 所述基站控制器设置成: 将 待拆除的本地交换的基站 BTS与终端 MS的 ACS更新为所述基站控制器中保 存的所述 BTS的初始 ACS;
拆除所述待拆除的本地交换的用户面资源。
14、如权利要求 13所述的基站控制器, 所述基站控制器是设置成通过如 下方式将待拆除的 BTS与 MS的 ACS更新为所述基站控制器中保存的所述 BTS的初始 ACS:
所述基站控制器通过分别向所述 BTS发送速率更改消息将待进行本地交 换的 BTS的 ACS更新为所述初始 ACS, 所述 BTS再通过分别向各自的待拆 除的本地交换的 MS发送自适应多速率 AMR速率配置消息将各自的待拆除 的本地交换的 MS的 ACS更新为所述初始 ACS。
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