WO2010102586A1 - 一种基站系统间的呼叫切换方法及移动通信系统 - Google Patents

一种基站系统间的呼叫切换方法及移动通信系统 Download PDF

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Publication number
WO2010102586A1
WO2010102586A1 PCT/CN2010/071030 CN2010071030W WO2010102586A1 WO 2010102586 A1 WO2010102586 A1 WO 2010102586A1 CN 2010071030 W CN2010071030 W CN 2010071030W WO 2010102586 A1 WO2010102586 A1 WO 2010102586A1
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WIPO (PCT)
Prior art keywords
call
bsc
internal channel
target
local
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PCT/CN2010/071030
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English (en)
French (fr)
Inventor
李靖
王欣晖
Original Assignee
中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to EP10750382.3A priority Critical patent/EP2408233B1/en
Priority to ES10750382.3T priority patent/ES2527599T3/es
Publication of WO2010102586A1 publication Critical patent/WO2010102586A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0011Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0016Hand-off preparation specially adapted for end-to-end data sessions
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/10Reselecting an access point controller

Definitions

  • the present invention relates to the field of communications, and in particular, to a call handover method and a mobile communication system between base station systems (BSS).
  • BSS base station systems
  • GSM Global System for Mobile Communications
  • MSC Mobile Switching Center Server
  • BSC Base Station Controller
  • the GSM system When the call is established, the GSM system is based on the TDM (Time Division Multiplexing) bearer and the IP (Internet Protocol) bearer. In the process of assigning the A interface, it will be The call is assigned a call identity.
  • TDM Time Division Multiplexing
  • IP Internet Protocol
  • FIG. 1 is a flow chart of call switching between BSS (including BSC and BTS) in the existing GSM system. As shown in Figure 1, the process includes the following steps:
  • the MS sends a measurement report to the BTS1, and the BTS 1 forwards the measurement report to the BSC1;
  • the BTS1 sends a Handover Required (Handover Required, referred to as Handover RQD) message to the MSC.
  • Handover RQD Handover Required
  • the MSC sends a Handover Request (Handover REQ) message to the handover target BSC ( BSC2 ) ;
  • BSC2 sends channel activation to the BTS2 of the target cell (Channel Activation, referred to as
  • the BTS2 returns a Channel Activation Acknowledge (Channel Activation Acknowledgement) message to the BSC2.
  • 106 After activating the new channel, the BSC2 sends a Handover REQ ACK message to the MSC to notify the MSC that the channel is ready;
  • the MSC sends a Handover CMD message to the BSC1.
  • BSC1 sends a handover command message to BTS1, and forwards the message to the MS by BTS1.
  • Step 110 After receiving the handover access message sent by the MS, the BTS2 sends a Handover Detect message to the BSC2.
  • BSC2 sends a handover discovery message to the MSC
  • BTS2 sends a PHY INFO (physical information) message to the MS, which includes synchronization information such that the MS can correctly access the content;
  • PHY INFO physical information
  • the MS After receiving the PHY INFO, the MS sends a SABM (Set Asynchronous Balanced Mode) frame to the BTS2;
  • SABM Set Asynchronous Balanced Mode
  • the BTS2 After receiving the SABM frame, the BTS2 sends an establishment indication (EST IND) message to the BSC2 to notify the BSC2 that the radio link is established;
  • EST IND establishment indication
  • the BTS2 sends to the MS with a UA (Unnumbered Acknowledgement) frame, and notifies the MS radio link layer to establish;
  • the MS sends a Handover Complete message to the BTS2, and the BTS2 forwards the handover complete message to the BSC2 to notify the BSC2 that the handover is completed.
  • BSC2 sends a handover complete message to the MSC
  • the MSC After receiving the handover complete message sent by the BSC2, the MSC sends a Clear CMD message to the BSCl.
  • the BSCl initiates a local release, releases the original channel, and responds to the Clear CMP message to the MSC, indicating that the clearing is complete. .
  • the BSC is transmitted to the Media Gateway (MGW) through the A interface, and then transmitted by the MGW to the BSC of the calling party, even if both parties are in the same BSC.
  • MGW Media Gateway
  • the so-called local call means that both parties of the call belong to the same BTS, or belong to different BTSs under the same BTS cluster (BTSs under the same BTS cluster belong to A BSC), or belongs to the same BSC. For these local calls, if the current call processing flow is followed, then:
  • the Abis port of the BTS is transmitted to the BSC, and the BSC transmits the user plane voice to the MGW.
  • the MGW then transmits the user plane voice back to the original BSC, and the original BSC transmits the user plane voice to the original BTS, resulting in Abis port and A. Waste of interface transmission resources;
  • the user's voice of the calling party is transmitted to the control BTS of the BTS cluster through the Abis port of the BTS, and the BTS cluster is controlled.
  • the BTS then transmits the user plane voice to the BSC through its Abis port, and the BSC transmits the user plane voice to the MGW, and the MGW transmits the user plane voice back to the original BSC, and the original BSC transmits the user plane voice to the original BTS cluster.
  • the control BTS, the control BTS of the original BTS cluster transmits the user plane voice to the original BTS, which causes the BTS cluster to control the waste of the Abis interface transmission resource between the BTS and the BSC, and also wastes the A interface transmission resource;
  • the BSC For calls belonging to the same BSC, the BSC first transmits the user plane voice to the MGW, and the MGW transmits the user plane voice back to the original BSC, resulting in waste of the A interface transmission resources.
  • the user plane voice 1 sent by the MS1 is sent by the BSS to the MGW in the core network, and then returned by the MGW to the BSS, and then sent by the BSS to the MS2; the user plane voice 2 sent by the MS2 is similar. Summary of the invention
  • the technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a call handover method and a mobile communication system between BSSs that can avoid waste of Abis interface and A interface transmission resources.
  • the present invention provides a call handover method between base station systems, including:
  • the mobile switching center MSC After receiving the handover request message sent by the source base station controller BSC, the mobile switching center MSC determines whether the first call corresponding to the message forms a local call with the second call after the handover, and if so, Transmitting, to the target BSC, a handover request message carrying a local call identifier; the local call identifier is used to identify the second call;
  • the target BSC After receiving the handover request message, the target BSC establishes, according to the local call identifier, for transmitting the first call and the second call between users of the first call and the second call without going through the core network.
  • the target BSC After the target BSC receives the handover discovery message sent by the target base station BTS, the user plane voice of the first call and the second call is transmitted using the internal channel.
  • the above method may also have the following features:
  • the local call identifier includes:
  • the above method may also have the following features:
  • the step of the target BSC establishing the internal channel includes:
  • the target BSC selects a voice coding mode for the first call, and compares the voice coding modes of the first call and the second call: if the voice coding modes of the first call and the second call are compatible with each other, Then the target
  • the BSC establishes the internal channel for transmitting user plane speech of the first call and the second call directly between users of the first call and the second call;
  • the target BSC includes a codec unit, setting a voice for the first call or the second call in the internal channel A codec unit that converts the encoding method.
  • the above method may also have the following features:
  • the method further includes:
  • User plane voice of the first call and the second call Determining, by the target BSC, whether to allow the user plane voice of the first call and the second call to be transmitted by using the internal channel according to a current state of the second call, and using the internal channel transmission only when the determination result is allowed.
  • the above method may also have the following features: In the step of determining whether to allow the user plane voice of the first call and the second call to be transmitted using the internal channel,
  • the target BSC determines that the user plane voice of the first call and the second call is not allowed to be transmitted using the internal channel.
  • the above method may also have the following features:
  • the method further includes:
  • the target BSC After receiving the handover complete message sent by the target BTS, the target BSC removes the connection between the first call and the second call for transmitting the user plane voice on the A interface, and notifies the MSC to remove the first The call and the second call are used on the A interface to transmit the connection of the user plane voice.
  • the above method may also have the following features:
  • the BSC In the step of notifying the MSC to be removed, the BSC notifies the MSC to remove the first call and the second call at the A interface for transmitting user plane voice by including a local call local exchange indicator in the handover complete message. Connection;
  • the local call local exchange indicator is used to identify whether the internal channel has been used for transmission of user plane voice of the first call and the second call.
  • the above method may also have the following features:
  • the MSC joins a local exchange indicator in the handover request message, the indicator is used to notify whether it is desirable to use the internal channel to perform the first call and The transmission of the user's face voice of the second call.
  • the present invention provides a base station controller BSC, including a sending message module and an internal channel module, wherein:
  • the sending message module is configured to: when the BSC is used as the source BSC, send a handover request message, so that: the mobile switching center MSC sends the handover request message sent by the source BSC to the target BSC after receiving the handover request message sent by the source BSC. a handover request message carrying a local call identifier, where the local call identifier is used to identify the second call;
  • the establishing an internal channel module is configured to: when the BSC is used as a target BSC, After receiving the handover request message sent by the MSC, the target BSC establishes, according to the local call identifier, the first call and the second call between the users of the first call and the second call without going through the core network.
  • the internal channel of the user plane voice of the call and after receiving the handover discovery message sent by the target base station BTS, using the internal channel to transmit the user plane voice of the first call and the second call.
  • the above BSC may also have the following characteristics:
  • the establishing the internal channel module is further configured to: when the BSC is used as the target BSC, the target BSC is further configured to: after the internal channel is established, before receiving the handover discovery message sent by the target BTS, according to the second
  • the current state of the call determines whether the user plane voice of the first call and the second call is allowed to be transmitted using the internal channel, and the first call and the second call are transmitted using the internal channel only when the judgment result is permitted.
  • User face voice is further configured to: when the BSC is used as the target BSC, the target BSC is further configured to: after the internal channel is established, before receiving the handover discovery message sent by the target BTS, according to the second
  • the current state of the call determines whether the user plane voice of the first call and the second call is allowed to be transmitted using the internal channel, and the first call and the second call are transmitted using the internal channel only when the judgment result is permitted. User face voice.
  • the present invention provides a base station system including the above BSC as a source BSC and a target BSC.
  • the present invention provides a mobile communication system, including a source base station system, a target base station system, and an MSC.
  • the source base station system includes a source BSC, where the target base station system includes a target BSC and a target BTS, where :
  • the MSC is configured to: after receiving the handover request message sent by the source BSC, determine whether the first call corresponding to the message forms a local call with the second call after the handover, and if yes, send the bearer to the target BSC. a handover request message of a local call identifier; the local call identifier is used to identify the second call;
  • the target BSC is configured to, after receiving the handover request message, establish, according to the local call identifier, to transmit the first call between users of the first call and the second call without going through a core network. And an internal channel of the user plane voice of the second call, and after receiving the handover discovery message sent by the target BTS, using the internal channel to transmit the user plane voice of the first call and the second call.
  • the BSC is further configured to: when used as the target BSC, after the target BSC is established, after receiving the internal channel, before receiving the handover discovery message sent by the target BTS, according to the second
  • the current state of the call determines whether the user plane voice of the first call and the second call is allowed to be transmitted using the internal channel, and the first call and the second call are transmitted using the internal channel only when the judgment result is permitted.
  • User face voice
  • the method and system of the present invention establishes an internal channel for transmitting user plane voice without passing through the core network between the BSSs, so that the user who constitutes the call of the local call after completing the call handover between the BSSs
  • the voice can be directly transmitted without the MGW of the core network, which avoids the waste of the transmission resources of the Abis port and the A interface.
  • BSS including BSC and BTS
  • FIG. 2 is a schematic diagram of performing user plane voice transmission between a mobile terminal, a BSC, and an MGW for a local call belonging to the same BSC in the prior art;
  • FIG. 3 is a schematic diagram of user plane voice transmission between a mobile terminal and a BSC for a local call belonging to the same BSC after local exchange;
  • BSS including BSC and BTS
  • FIG. 5 is a schematic diagram of a data structure of a local call identifier in an embodiment of the present invention
  • FIG. 6 is a schematic structural diagram of an indicator in an embodiment of the present invention.
  • the core idea of the present invention is that the local call local switch (LCLS) is implemented by the BSS (including the BSC and the BTS), that is, the user plane voice of the party that does not pass the local call is directly transmitted through the MGW of the core network.
  • the BSS does not directly send it to the MS2 through the MGW of the core network; the user plane voice 2 sent by the MS2 is similar.
  • Each network element entity e.g., the GSM system
  • the connection relationship of each network element entity i.e., message interaction relationship
  • the GSM system of the present invention includes: BSS1 (source BSS), BSS2 (target BSS) and MSC; BSS1 includes BTS1 (source BTS) and BSC1 (source BSC); BSS2 includes BTS2 (target BTS) and BSC2 (target BSC) ).
  • the MSC learns the handover request (Handover Required) message sent by the source BSC (BSCl) to the MSC when performing call handover between BSSs (switched from BSS1 to BSS2).
  • BSCl handover Request
  • the target BSC (BSC2) of the handover determines whether the local call is formed after the handover, and if the MSC finds that the local call is formed after the call is handed over, the handover request message sent to the target BSC carries an identifier identifying the local call (hereinafter referred to as The local call identifier), which is used to inform the handover target BSC of the call that needs to be handed over (which may be referred to as the first call) and which call under the BSC (which may be referred to as the second call) constitutes a local call after the handover.
  • the local call identifier an identifier identifying the local call
  • the target BSC After receiving the handover request message, the target BSC (BSC2) knows, according to the local call identifier in the handover request message, which call (first call) to be handed over to the BSC and which call is being served (second call) ) constitutes a local call after switching.
  • the handover target BSC establishes an internal channel for local exchange of local calls for the two calls.
  • the internal channel can be established inside a BTS, or can be established inside a BTS cluster, or can be built in a BSC.
  • the target BSC After completing the internal channel for the local exchange of the local call, the target BSC (BSC2) adds a local call connection completion indicator to the Handover Request Acknowledge message replied to the MSC. This indicator is used to inform the MSC of the handover call (first call). After switching to the target BSC, the local call local exchange function will be used.
  • the target BSC (BSC2) and the MSC use the local call local switching function to simultaneously disconnect the BSC and the MGW of the first call and the second call.
  • the BSC of the embodiment of the present invention includes a sending message module and an internal channel module, where:
  • the sending message module is configured to: when the BSC is used as a source BSC, send a handover request message, so that: the mobile switching center MSC receives the handover sent by the source BSC. After the message is obtained, the first call corresponding to the message is sent to the target BSC to send a handover request message carrying a local call identifier to the target BSC after the handover, and the local call identifier is used to identify the Second call
  • the establishing an internal channel module is configured to: when the BSC is used as the target BSC, after receiving the handover request message sent by the MSC, the target BSC establishes, according to the local call identifier, not to go through the core network.
  • the internal channel of the user plane voice of the first call and the second call is transmitted between the users of the first call and the second call, and after receiving the handover discovery message sent by the target base station BTS, using the internal channel transmission The user plane voice of the first call and the second call.
  • the establishing the internal channel module is further configured to: when the BSC is used as the target BSC, after the target BSC is established, after receiving the internal channel, before receiving the handover discovery message sent by the target BTS, Determining, by the current state of the second call, whether to allow the user plane voice of the first call and the second call to be transmitted by using the internal channel, and using the internal channel to transmit the first call and only when the judgment result is allowed User plane voice of the second call.
  • FIG. 4 is a flow chart of switching between BSS (including BSC and BTS) in the GSM system according to the embodiment of the present invention. As shown in FIG. 4, the process includes the following steps:
  • the MSC sends a Handover Request message to the handover target BSC ( BSC2 ) ;
  • the MSC determines whether the call corresponding to the message (the first call) is after a handover with a call in the BSC2 (second call).
  • the local call is formed (the specific judgment algorithm belongs to the prior art); if so, the MSC adds the local call identifier to the handover request message sent to the target BSC.
  • the local call identifier includes: a circuit identification code (CIC) of another party call (second call) that can form a local call with the to-be-switched call (first call) or another party call The Call Identifier (CI) called (Second Call).
  • the above circuit identification number is the existing circuit identifier in the protocol (used to mark the A interface call carried on the TDM Transport); the above call identifier is the existing Call ID in the protocol (for the bearer carried in the IP) A interface call on Transport).
  • the MSC sends the above identifier to the BSC by an assignment message.
  • the local call identifier may be included in a data structure as shown in FIG. 5, the data structure consisting of a Local Call reference ID for TDM (Local Call Reference Identifier for TDM) and a Local Call reference ID for IP (for The local call reference identifier of the IP is composed of two parts.
  • the CIC is included in the Local Call reference ID for TDM part, and the CI includes the Local Call reference ID for IP part.
  • the Local Call reference ID for TDM part When the other party of the local call is based on TDM transmission on the A interface, the Local Call reference ID for TDM part carries the CIC value, and the CI value of the Local Call reference ID for IP part may be null; and when the other party of the local call is in the A When the interface is based on IP transmission, the Local Call reference ID for IP part carries the CI value, and the CIC value of the Local Call reference ID for TDM part may be null.
  • the representation methods of Circuit Identity Codec and Call Identifier are prior art.
  • the MSC may add a local exchange indicator to the handover request message sent to the BSC, where the indicator is used to notify the BSC whether to use the local call.
  • Local exchange function The indicator can use the format shown in Figure 6, where the local exchange indicator occupies 8 bits, and the lower bit 1 is used to indicate whether local exchange is implemented during handover, and other bits can be reserved. The value of bit 1 is shown in Table 1:
  • BSC2 sends a channel activation message to the BTS2 of the target cell.
  • the BSC2 learns that the call will be localized with the call identified by the local call identifier after the handover. The call, therefore, in addition to completing the radio channel preparation, the BSC2 also directly establishes an internal channel for transmitting the local call user plane voice within the BSS, without establishing a connection channel with the MGW.
  • the BSC selects the speech coding mode for the call to be switched, and compares the selected speech coding mode with the other speech coding mode of the call. Six conditions will appear, as shown in Table 2:
  • the BSC2 When the first, second, and third cases occur, that is, when the voice coding modes of the two parties are compatible, the BSC2 establishes a transmission channel (internal channel) for directly transmitting the voice of the user's face of the call when establishing the internal channel, that is, The user plane voice of the party on the call is directly transmitted to the other party of the call.
  • a transmission channel internal channel
  • the TC Trans-coder
  • the TC Trans-coder
  • the voice code of the calling party is converted into the other party's compatible voice coding mode by the TC, that is, the internal channel transmits the user plane voice of the party to the TC in the BSS first, and the TC converts the received user plane voice into another.
  • a compatible encoding method is transmitted to the other party of the call.
  • the BTS2 returns a Channel Activation Acknowledge (Channel Activation Acknowledgement) message to the BSC2.
  • BSC2 sends a handover request acknowledgement message to the MSC
  • the BSC2 can determine whether the local call formed for the first call and the second call can use the local exchange according to the current state of the second call before receiving the handover discovery message of step 410.
  • BSC2 deletes the established internal channel.
  • the BSC2 After receiving the handover complete message sent by the MS through the BTS2, the BSC2 sends a handover complete message to the MSC.
  • the handover target BSC (BSC2) removes the first call and the second call on the A interface after receiving the handover completion message sent by the MS through the BTS2.
  • the MSC For transmitting the connection between the first call and the second call for transmitting the user plane voice on the A interface.
  • step 418 in order to enable the MSC to know whether the internal channel has been used after receiving the handover complete message, whether the first call and the second call between the MGW and the BSC need to be removed are used for transmitting the user plane.
  • the link of voice therefore, BSC2 adds a local call local exchange indicator in the handover complete message it sends.
  • the local call local exchange indicator is in the format shown in FIG.
  • the local call local exchange indicator occupies 8 bits, and the lower bit 1 is used to indicate the status of the local exchange, and other bits can be reserved.
  • bit 1 can be used to indicate whether the local call local exchange function is used after the handover is completed, see Table 3:
  • the present invention provides a call handover method between a base station system, a BSC, a base station system, and a mobile communication system, by establishing an internal channel between BSSs for transmitting user plane voice without passing through a core network, so that after completing a call handover between BSSs
  • the user plane voice of the call constituting the local call can be directly transmitted without passing through the MGW of the core network, thereby avoiding waste of the transmission resources of the Abis port and the A interface.

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Abstract

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Description

一种基站系统间的呼叫切换方法及移动通信系统
技术领域
本发明涉及通信领域, 尤其涉及一种基站系统(BSS ) 间的呼叫切换方 法及移动通信系统。
背景技术
在现有的全球移动通讯系统 ( Global System for Mobile Communications, 简称为 GSM ) 中, 移动交换中心 (Mobile Switching Center Server, 简称为 MSC Server或 MSC )和基站控制器( Base Station Controller, 简称为 BSC ) 之间釆用 A接口进行通信; 而移动终端 (Mobile Station, 简称为 MS )与基 站( Base Transceiver Station, 简称为 BTS )之间通过 Um接口进行通信; 此 夕卜, BTS与 BSC之间通过 Abis接口连接。
GSM 系统在呼叫建立时, 无论该呼叫是基于 TDM ( Time Division Multiplexing, 时分复用)承载还 ^^于 IP ( Internet Protocol, 因特网协议) 承载, 在 A接口进行指派的过程中, 会为每一呼叫分配一个呼叫标识。
图 1是现有的 GSM系统中的 BSS (包含 BSC和 BTS ) 间的呼叫切换流 程图, 如图 1所示, 该流程包括如下步骤:
101 : MS向 BTS1发送测量才艮告 ( Measurement Report ) , BTS 1再将测 量报告转发给 BSC1 ;
102: BTS1向 MSC发送切换要求(Handover Required, 简称 Handover RQD ) 消息;
103: MSC发送切换请求(Handover Request, 简称 Handover REQ )消息 给切换目标 BSC ( BSC2 ) ;
104: BSC2向目标小区的 BTS2发送信道激活( Channel Activation, 简称
Channel ACT ) 消息, 以激活信道;
105: BTS2向 BSC2返回信道激活确认( Channel Activation Acknowledge, 简称 Channel Activation ACK ) 消息; 106: BSC2在激活新信道后, 发送切换请求确认(Handover REQ ACK ) 消息给 MSC, 通知 MSC信道已经准备好;
107: MSC向 BSC1发送切换命令 ( Handover CMD ) 消息;
108: BSC1发送切换命令消息给 BTS1 , 由 BTS1将该消息转发给 MS; 109: MS接收到切换命令后,尝试从 BTS2接入,发送切换接入( Handover
Access ) 消息给 BTS2;
110: BTS2收到 MS发送的切换接入消息后, 发送切换发现(Handover Detect ) 消息给 BSC2;
111 : BSC2发送切换发现消息给 MSC;
112 - 113: BTS2向 MS发送 PHY INFO (物理信息) 消息, 该消息中包 含使 MS能正确接入的同步信息等内容;
114: MS接收到 PHY INFO后, 发送 SABM ( Set Asynchronous Balanced Mode, 设置异步平衡模式) 帧到 BTS2;
115: BTS2收到 SABM帧后,将发送建立指示( EST IND )消息给 BSC2, 通知 BSC2无线链路建立;
116: 发送建立指示消息的同时, BTS2 给 MS 回应 UA ( Unnumbered Acknowledgement, 无编号确认) 帧, 通知 MS无线链路层建立;
117: MS发送切换完成( Handover Complete )消息给 BTS2, BTS2转发 切换完成消息给 BSC2, 通知 BSC2切换完成;
118: BSC2发送切换完成消息给 MSC;
119 ~ 120: MSC收到 BSC2发送的切换完成消息后,发送清除命令( Clear CMD )消息给 BSCl , BSCl发起本地释放, 释放原信道, 同时回应清除完成 ( Clear CMP ) 消息给 MSC, 表示清除完成。
目前在 GSM系统中,对于正在进行的通话都将呼叫一方的用户面语音由
BSC通过 A接口传递给媒体网关 (Media Gateway, 简称为 MGW ) , 再由 MGW传递给呼叫对方的 BSC, 即使通话双方都处于同一个 BSC下。 但是, 在实际的 GSM系统中, 存在着大量本地通话(local call ) 的情况, 所谓本地 通话是指呼叫的双方都属于同一 BTS下, 或者属于同一 BTS簇下不同 BTS (同一 BTS簇下的 BTS都属于一个 BSC ) , 或者属于同一 BSC下。 对这些 本地通话, 如果沿用目前的呼叫处理流程, 则:
1 )对于属于同一 BTS下的呼叫, 就会出现呼叫一方的用户面语音通过
BTS的 Abis口传送给 BSC, BSC再将该用户面语音传送给 MGW, MGW再 把用户面语音传送回原 BSC, 原 BSC再将该用户面语音传送给原 BTS的情 况, 导致 Abis口和 A接口传输资源的浪费;
2 )对于属于同一 BTS簇下的不同 BTS的呼叫, 就会出现呼叫一方的用 户面语音通过 BTS的 Abis口传送给该 BTS簇的控制 BTS, 该 BTS簇的控制
BTS再通过其 Abis口将该用户面语音传送给 BSC, BSC再将该用户面语音传 送给 MGW, MGW再将用户面语音传送回原 BSC, 原 BSC再将该用户面语 音传送给原 BTS簇的控制 BTS, 原 BTS簇的控制 BTS再将该用户面语音传 送给原 BTS的情况,导致 BTS簇的控制 BTS与 BSC间的 Abis口传输资源的 浪费, 同时也浪费了 A接口传输资源;
3 )对于属于同一 BSC下的呼叫, 就会出现 BSC先将用户面语音传送给 MGW, MGW再把用户面语音传送回原 BSC的情况, 导致 A接口传输资源 的浪费。 如图 2所示, MS1发送的用户面语音 1 由 BSS发送给核心网中的 MGW, 再由 MGW返回给 BSS, 然后由 BSS发送给 MS2; MS2发送的用户 面语音 2也类似。 发明内容
本发明所要解决的技术问题是, 克服现有技术的不足, 提供一种可避免 Abis口和 A接口传输资源的浪费的 BSS间的呼叫切换方法及移动通信系统。
为了解决上述技术问题, 本发明提供一种基站系统间的呼叫切换方法, 包括:
移动交换中心 MSC在接收到源基站控制器 BSC发送的切换要求消息后, 判断该消息对应的第一呼叫在切换后是否与第二呼叫构成本地通话,如果是, 则向目标 BSC发送携带本地通话标识符的切换请求消息; 所述本地通话标识 符用于标识所述第二呼叫;
接收到所述切换请求消息后, 目标 BSC根据所述本地通话标识符建立用 于不经过核心网在所述第一呼叫和第二呼叫的用户之间传输所述第一呼叫和 第二呼叫的用户面语音的内部通道;
当目标 BSC接收到目标基站 BTS发送的切换发现消息后,使用所述内部 通道传输所述第一呼叫和第二呼叫的用户面语音。
进一步地, 上述方法还可具有以下特点:
所述本地通话标识符中包含:
所述第二呼叫的电路识别号、 或所述第二呼叫的呼叫标识符。
进一步地, 上述方法还可具有以下特点:
所述目标 BSC建立所述内部通道的步骤包括:
所述目标 BSC为所述第一呼叫选择语音编码方式, 并对所述第一呼叫和 第二呼叫的语音编码方式进行比较: 如果所述第一呼叫和第二呼叫的语音编码方式相互兼容, 则所述目标
BSC建立直接在所述第一呼叫和第二呼叫的用户之间传输所述第一呼叫和第 二呼叫的用户面语音的所述内部通道;
如果所述第一呼叫和第二呼叫的语音编码方式不兼容, 且所述目标 BSC 中包含编解码单元, 则在所述内部通道中设置用于对所述第一呼叫或第二呼 叫的语音编码方式进行转换的编解码单元。
进一步地, 上述方法还可具有以下特点:
在所述目标 BSC建立所述内部通道后、 接收到所述切换发现消息前, 还 包括:
所述目标 BSC根据所述第二呼叫的当前状态判断是否允许使用所述内部 通道传输所述第一呼叫和第二呼叫的用户面语音, 仅当判断结果为允许时才 使用所述内部通道传输所述第一呼叫和第二呼叫的用户面语音。
进一步地, 上述方法还可具有以下特点: 在判断是否允许使用所述内部通道传输所述第一呼叫和第二呼叫的用户 面语音的步骤中,
当所述第二呼叫的当前状态为正在进行切换, 则所述目标 BSC判断不允 许使用所述内部通道传输所述第一呼叫和第二呼叫的用户面语音。
进一步地, 上述方法还可具有以下特点:
在判断是否允许使用所述内部通道传输所述第一呼叫和第二呼叫的用户 面语音的步骤中, 如果所述判断结果为允许使用所述内部通道传输所述第一 呼叫和第二呼叫的用户面语音, 则所述方法还包括:
所述目标 BSC在接收到所述目标 BTS发送的切换完成消息后,拆除所述 第一呼叫和第二呼叫在 A接口用于传输用户面语音的连接,并通知所述 MSC 拆除所述第一呼叫和第二呼叫在 A接口用于传输用户面语音的连接。
进一步地, 上述方法还可具有以下特点:
在通知所述 MSC拆除的步骤中, 所述 BSC通过在切换完成消息中包含 本地通话本地交换指示符来通知所述 MSC拆除所述第一呼叫和第二呼叫在 A 接口用于传输用户面语音的连接;
所述本地通话本地交换指示符用于标识是否已使用所述内部通道进行所 述第一呼叫和第二呼叫的用户面语音的传输。
进一步地, 上述方法还可具有以下特点:
在所述 MSC向目标 BSC发送切换请求消息的步骤中 ,所述 MSC在所述 切换请求消息加入本地交换指示符, 该指示符用于告知是否希望使用所述内 部通道进行所述第一呼叫和第二呼叫的用户面语音的传输。
为了解决上述技术问题, 本发明提供一种基站控制器 BSC, 包括发送消 息模块和建立内部通道模块, 其中:
所述发送消息模块设置成: 在所述 BSC作为源 BSC使用时, 发送的切 换要求消息, 以使: 移动交换中心 MSC在接收到所述源 BSC发送的切换要 求消息后向所述目标 BSC发送携带本地通话标识符的切换请求消息, 所述本 地通话标识符用于标识所述第二呼叫;
所述建立内部通道模块设置成: 在所述 BSC作为目标 BSC使用时, 该 目标 BSC在接收到 MSC发送的切换请求消息后, 根据所述本地通话标识符 建立用于不经过核心网在所述第一呼叫和第二呼叫的用户之间传输所述第一 呼叫和第二呼叫的用户面语音的内部通道, 并且在接收到目标基站 BTS发送 的切换发现消息后, 使用所述内部通道传输所述第一呼叫和第二呼叫的用户 面语音。
进一步地, 上述 BSC还可具有以下特点:
所述建立内部通道模块还设置成: 在所述 BSC作为目标 BSC使用时, 该目标 BSC还在建立所述内部通道后、接收到所述目标 BTS发送的切换发现 消息前, 根据所述第二呼叫的当前状态判断是否允许使用所述内部通道传输 所述第一呼叫和第二呼叫的用户面语音, 仅当判断结果为允许时才使用所述 内部通道传输所述第一呼叫和第二呼叫的用户面语音。
为了解决上述技术问题, 本发明提供一种基站系统, 其包括上述的 BSC 作为源 BSC和目标 BSC使用。
为了解决上述技术问题, 本发明提供一种移动通信系统, 包含源基站系 统、 目标基站系统和 MSC; 所述源基站系统中包含源 BSC, 所述目标基站系 统中包含目标 BSC和目标 BTS, 其中:
所述 MSC设置成在接收到所述源 BSC发送的切换要求消息后, 判断该 消息对应的第一呼叫在切换后是否与第二呼叫构成本地通话, 如果是, 则向 所述目标 BSC发送携带本地通话标识符的切换请求消息; 所述本地通话标识 符用于标识所述第二呼叫;
所述目标 BSC设置成在接收到所述切换请求消息后,根据所述本地通话 标识符建立用于不经过核心网在所述第一呼叫和第二呼叫的用户之间传输所 述第一呼叫和第二呼叫的用户面语音的内部通道, 并且在接收到所述目标 BTS发送的切换发现消息后, 使用所述内部通道传输所述第一呼叫和第二呼 叫的用户面语音。
进一步地, 上述系统还可具有以下特点:
所述 BSC还设置成: 在作为目标 BSC使用时, 该目标 BSC还在建立所 述内部通道后、 接收到所述目标 BTS发送的切换发现消息前, 根据所述第二 呼叫的当前状态判断是否允许使用所述内部通道传输所述第一呼叫和第二呼 叫的用户面语音, 仅当判断结果为允许时才使用所述内部通道传输所述第一 呼叫和第二呼叫的用户面语音。
综上所述, 釆用本发明的方法及系统, 通过在 BSS间建立用于不经过核 心网传输用户面语音的内部通道, 使得在完成 BSS间的呼叫切换后, 构成本 地通话的呼叫的用户面语音可以不经过核心网的 MGW直接传输, 避免了 Abis口和 A接口传输资源的浪费。 附图概述
图 1是现有的 GSM系统中的 BSS (包含 BSC和 BTS ) 间的呼叫切换流 程图;
图 2是现有技术中, 对属于同一 BSC的本地呼叫, 移动终端、 BSC和 MGW间进行用户面语音传输的示意图;
图 3是在进行了本地交换以后, 对属于同一 BSC的本地呼叫, 移动终端 和 BSC间进行用户面语音传输的示意图;
图 4是本发明实施例 GSM系统中的 BSS (包含 BSC和 BTS ) 间的切换 流程图;
图 5是本发明实施例中的本地通话标识符的一种数据结构示意图; 图 6是本发明实施例中的指示符的一种结构示意图。 本发明的较佳实施方式
本发明的核心思想是, 由 BSS (包括 BSC和 BTS )实现本地通话本地交 换的功能(Local Call Local Switch, 简称 LCLS ) , 即不通过核心网的 MGW 直接将本地通话的一方的用户面语音发送给另一方, 如图 3所示, MS1发送 的用户面语音 1到达 BSS后, BSS不经过核心网的 MGW直接将其发送给 MS2; MS2发送的用户面语音 2也类似。
下面将对本发明实施例可实现本地通话本地交换功能的移动通信系统 (例如, GSM系统)中的各网元实体进行简要描述; 各网元实体的连接关系 (即消息交互关系)将在后续对本发明方法进行说明时详细描述。
本发明的 GSM 系统中包含: BSS1 (源 BSS ) 、 BSS2 (目标 BSS )和 MSC; BSS1中包含 BTS1 (源 BTS )和 BSC1 (源 BSC ); BSS2中包含 BTS2 (目标 BTS )和 BSC2 (目标 BSC ) 。
具体地说, MSC除了完成现有协议规定的功能外,在进行 BSS间的呼叫 切换(由 BSS1切换到 BSS2 ) 时, MSC根据源 BSC ( BSCl )发送给 MSC 的切换要求(Handover Required )消息获知切换的目标 BSC ( BSC2 ) , MSC 判断在切换后是否构成本地通话, 若 MSC发现在呼叫切换后构成本地通话, 则在发送给目标 BSC的切换请求消息中携带标识本地通话的标识符(以下称 为本地通话标识符), 该标识符用于告知切换目标 BSC需要切换的呼叫 (可 以称为第一呼叫 )与该 BSC下哪一个呼叫 (可以称为第二呼叫 )在切换后构 成本地通话。
目标 BSC ( BSC2 )在收到切换请求消息后, 根据切换请求消息中的本地 通话标识符, 获知将要切换到该 BSC下的呼叫 (第一呼叫 )与哪个正在其服 务下的呼叫 (第二呼叫)在切换后构成本地通话。 切换目标 BSC建立用于这 两个呼叫的本地通话本地交换的内部通道, 该内部通道可以建立在一个 BTS 内部, 也可以建立在一个 BTS簇内部, 也可以建立在一个 BSC内部。
目标 BSC ( BSC2 )在完成用于本地通话本地交换的内部通道后, 在回复 给 MSC的切换请求确认 ( Handover Request Acknowledge ) 消息中加入本地 通话连接完成指示符。 该指示符用于告知 MSC进行切换的呼叫 (第一呼叫) 在切换到目标 BSC后, 将使用本地通话本地交换的功能。
目标 BSC ( BSC2 )和 MSC在完成切换后, 使用本地通话本地交换功能, 同时拆除第一呼叫和第二呼叫的 BSC与 MGW之间的连接。
综上, 本发明实施例的 BSC, 包括发送消息模块和建立内部通道模块, 其中:
所述发送消息模块设置成: 在所述 BSC作为源 BSC使用时, 发送的切 换要求消息, 以使: 移动交换中心 MSC在接收到所述源 BSC发送的切换要 求消息后判断该消息对应的第一呼叫在切换后是与第二呼叫构成本地通话时 向所述目标 BSC发送携带本地通话标识符的切换请求消息, 所述本地通话标 识符用于标识所述第二呼叫;
所述建立内部通道模块设置成: 在所述 BSC作为目标 BSC使用时, 该 目标 BSC在接收到 MSC发送的切换请求消息后, 根据所述本地通话标识符 建立用于不经过核心网在所述第一呼叫和第二呼叫的用户之间传输所述第一 呼叫和第二呼叫的用户面语音的内部通道, 并且在接收到目标基站 BTS发送 的切换发现消息后, 使用所述内部通道传输所述第一呼叫和第二呼叫的用户 面语音。
优选地, 所述建立内部通道模块还设置成: 在所述 BSC作为目标 BSC 使用时,该目标 BSC还在建立所述内部通道后、接收到所述目标 BTS发送的 切换发现消息前, 根据所述第二呼叫的当前状态判断是否允许使用所述内部 通道传输所述第一呼叫和第二呼叫的用户面语音, 仅当判断结果为允许时才 使用所述内部通道传输所述第一呼叫和第二呼叫的用户面语音。
下面将结合附图和实施例对本发明的方法以及上述各网元之间的消息交 互关系进行详细描述。
图 4是本发明实施例 GSM系统中的 BSS (包含 BSC和 BTS ) 间的切换 流程图, 如图 4所示, 该流程包括如下步骤:
401 - 402: 与 101 ~ 102相同;
403 : MSC 发送切换请求 (Handover Request ) 消息给切换目标 BSC ( BSC2 ) ;
在切换过程中, 当收到切换的源 BSC ( BSC1 )发送的切换要求消息后, MSC判断该消息对应的呼叫 (第一呼叫)在切换后是否与 BSC2中的某一呼 叫 (第二呼叫)构成本地通话(具体的判断算法属于现有技术) ; 如果是, MSC在向目标 BSC发送的切换请求消息中添加本地通话标识符。 本地通话 标识符中包含: 能与该待切换呼叫 (第一呼叫)构成本地通话的另一方呼叫 (第二呼叫) 的电路识别号 (Circuit Identity Codec, 简称 CIC )或另一方呼 叫 (第二呼叫) 的呼叫标识符( Call Identifier, 简称 CI ) 。
上述电路识别号即协议中现有的电路标识符 (用于标志承载在 TDM Transport (传输)上的 A接口呼叫);上述呼叫标识符即协议中现有的 Call ID (用于标志承载在 IP Transport上的 A接口呼叫) 。 在呼叫建立时, MSC会 通过指派消息将上述标识符发送给 BSC。
优选的, 本地通话标识符可以包含在如图 5所示的数据结构中, 该数据 结构由 Local Call reference ID for TDM (用于 TDM的本地通话参考标识符) 和 Local Call reference ID for IP(用于 IP的本地通话参考标识符)两部分组成, CIC包含在 Local Call reference ID for TDM部分中, CI包含 Local Call reference ID for IP部分中。当本地通话的另一方在 A接口基于 TDM传输时,使用 Local Call reference ID for TDM部分携带 CIC值,而 Local Call reference ID for IP部 分的 CI值可以为空; 而当本地通话的另一方在 A接口基于 IP传输时, 使用 Local Call reference ID for IP部分携带 CI值,而 Local Call reference ID for TDM 部分的 CIC值可以为空。其中 Circuit Identity Codec和 Call Identifier的表示方 法为现有技术。
可选的, MSC为了明确告知 BSC是否希望对该本地通话使用本地交换 功能, MSC可以在发送给 BSC的切换请求消息中添加本地交换指示符, 该 指示符用于告知 BSC是否对该本地通话使用本地交换功能。 该指示符可以釆 用如图 6所示的格式, 其中, 本地交换指示符占用 8个比特, 使用低位的比 特 1 来指示在切换过程中是否实现本地交换, 其他比特位可以预留。 比特 1 的取值如表 1所示:
Figure imgf000012_0001
表 1
404: BSC2向目标小区的 BTS2发送信道激活消息;
此外, BSC2在收到切换请求消息后,若切换请求消息中带有本地通话标 识符, BSC2获知该呼叫在切换后将与本地通话标识符所标识的呼叫构成本地 通话, 因此 BSC2除完成无线信道准备外, 还要在 BSS内部直接建立用于传 输该本地通话用户面语音的内部通道, 而不与 MGW建立连接通道。
建立上述内部通道时, BSC为进行切换的呼叫选择语音编码方式后, 将 选择的语音编码方式与通话的另一方的语音编码方式进行比较。 此时会出现 6种情况, 如表 2所示:
Figure imgf000013_0001
表 2
当出现第 1、 2、 3种情况时, 即在通话双方的语音编码方式兼容的情况 下, BSC2在建立内部通道时,建立直接传送通话双方用户面语音的传输通道 (内部通道) , 即, 将通话一方的用户面语音直接传送给通话的另一方。
当出现第 4、 5种情况时,即在通话双方的语音编码方式不兼容的情况下, 内部通道中需要设置 TC ( Trans-coder, 编解码单元); BSC在使用内部通道 时, 需要将收到的通话一方的语音编码通过 TC转换成另一方兼容的语音编 码方式, 即, 内部通道为将通话一方的用户面语音先传送给 BSS 内的 TC, TC将收到的用户面语音转换为另一方兼容的编码方式,再传送给通话的另一 方。
当出现第 6种情况时, 将无法使用本地通话本地交换功能。
405: BTS2向 BSC2返回信道激活确认( Channel Activation Acknowledge, 简称 Channel Activation ACK ) 消息;
406: BSC2发送切换请求确认消息给 MSC;
407 - 417: 与步骤 107 ~ 117相同; 此外, BSC2在完成建立内部通道之后、接收到步骤 410的切换发现消息 前, 可以根据第二呼叫的当前状态判断对于第一呼叫和第二呼叫构成的本地 通话是否可以使用本地交换。
具体地说, 当第二呼叫的当前状态为: 正在进行切换时, 不可以使用本 地通话本地交换功能。
如果上述判断的结果为不可以使用本地交换功能, 则 BSC2删除已建立 的内部通道。
418: 接收到 MS通过 BTS2发送的切换完成消息后, BSC2发送切换完 成消息给 MSC;
如果上述判断的结果为在切换后可以使用本地通话本地交换功能的呼 叫,切换目标 BSC ( BSC2 )在接收到 MS通过 BTS2发送的切换完成消息后, 拆除第一呼叫和第二呼叫在 A接口用于传输用户面语音的连接;相应的, MSC 在收到 BSC2发送的切换完成消息时, 拆除第一呼叫和第二呼叫在 A接口用 于传输用户面语音的连接。
此外, 在步骤 418中, 为了使 MSC在收到切换完成消息后, 明确获知是 否已使用所述内部通道, 进而是否需要拆除第一呼叫和第二呼叫的 MGW与 BSC之间用于传输用户面语音的链接, 因此, BSC2在其发送的所述切换完 成消息中添加本地通话本地交换指示符。
优选的, 本地通话本地交换指示符釆用如图 6所示的格式。 其中, 本地 通话本地交换指示符占用 8个比特, 使用低位的比特 1来指示本地交换的状 态, 其他比特位可以预留。 具体地, 可以使用比特 1来指示在切换完成后, 是否使用本地通话本地交换的功能, 参见表 3:
Figure imgf000014_0001
表 3
也就是说, 当比特 1取值为 1时, 表示该呼叫已经使用了本地交换功 当比特 1的取值为 0时, 表示该呼叫未使用本地交换功能。 419 - 420: 与步骤 119 ~ 120相同。
尽管本发明结合特定实施例进行了描述, 但是对于本领域的技术人员来 说, 可以在不背离本发明的精神或范围的情况下进行修改和变化。 这样的修 改和变化被视作在本发明的范围和附加的权利要求书范围之内。
工业实用性
本发明提供一种基站系统间的呼叫切换方法、 BSC、 基站系统以及移动 通信系统,通过在 BSS间建立用于不经过核心网传输用户面语音的内部通道, 使得在完成 BSS间的呼叫切换后, 构成本地通话的呼叫的用户面语音可以不 经过核心网的 MGW直接传输, 避免了 Abis口和 A接口传输资源的浪费。

Claims

权 利 要 求 书
1、 一种基站系统间的呼叫切换方法, 包括:
移动交换中心 MSC在接收到源基站控制器 BSC发送的切换要求消息后, 判断该消息对应的第一呼叫在切换后是否与第二呼叫构成本地通话,如果是, 则向目标 BSC发送携带本地通话标识符的切换请求消息; 所述本地通话标识 符用于标识所述第二呼叫;
接收到所述切换请求消息后, 目标 BSC根据所述本地通话标识符建立用 于不经过核心网在所述第一呼叫和第二呼叫的用户之间传输所述第一呼叫和 第二呼叫的用户面语音的内部通道; 当目标 BSC接收到目标基站 BTS发送的切换发现消息后,使用所述内部 通道传输所述第一呼叫和第二呼叫的用户面语音。
2、 如权利要求 1所述的方法, 其中:
所述本地通话标识符中包含:
所述第二呼叫的电路识别号、 或所述第二呼叫的呼叫标识符。
3、 如权利要求 1所述的方法, 其中:
所述目标 BSC建立所述内部通道的步骤包括:
所述目标 BSC为所述第一呼叫选择语音编码方式, 并对所述第一呼叫和 第二呼叫的语音编码方式进行比较:
如果所述第一呼叫和第二呼叫的语音编码方式相互兼容, 则所述目标 BSC建立直接在所述第一呼叫和第二呼叫的用户之间传输所述第一呼叫和第 二呼叫的用户面语音的所述内部通道;
如果所述第一呼叫和第二呼叫的语音编码方式不兼容, 且所述目标 BSC 中包含编解码单元, 则在所述内部通道中设置用于对所述第一呼叫或第二呼 叫的语音编码方式进行转换的编解码单元。
4、 如权利要求 1所述的方法, 其中:
在所述目标 BSC建立所述内部通道后、 接收到所述切换发现消息前, 还 包括:
所述目标 BSC根据所述第二呼叫的当前状态判断是否允许使用所述内部 通道传输所述第一呼叫和第二呼叫的用户面语音, 仅当判断结果为允许时才 使用所述内部通道传输所述第一呼叫和第二呼叫的用户面语音。
5、 如权利要求 4所述的方法, 其中:
在判断是否允许使用所述内部通道传输所述第一呼叫和第二呼叫的用户 面语音的步骤中,
当所述第二呼叫的当前状态为正在进行切换, 则所述目标 BSC判断不允 许使用所述内部通道传输所述第一呼叫和第二呼叫的用户面语音。
6、 如权利要求 4所述的方法, 其中:
在判断是否允许使用所述内部通道传输所述第一呼叫和第二呼叫的用户 面语音的步骤中, 如果所述判断结果为允许使用所述内部通道传输所述第一 呼叫和第二呼叫的用户面语音, 则所述方法还包括:
所述目标 BSC在接收到所述目标 BTS发送的切换完成消息后,拆除所述 第一呼叫和第二呼叫在 A接口用于传输用户面语音的连接,并通知所述 MSC 拆除所述第一呼叫和第二呼叫在 A接口用于传输用户面语音的连接。
7、 如权利要求 6所述的方法, 其中:
在通知所述 MSC拆除的步骤中, 所述 BSC通过在切换完成消息中包含 本地通话本地交换指示符来通知所述 MSC拆除所述第一呼叫和第二呼叫在 A 接口用于传输用户面语音的连接;
所述本地通话本地交换指示符用于标识是否已使用所述内部通道进行所 述第一呼叫和第二呼叫的用户面语音的传输。
8、 如权利要求 1至 7所述的任一项方法, 其中:
在所述 MSC向目标 BSC发送切换请求消息的步骤中 ,所述 MSC在所述 切换请求消息加入本地交换指示符, 该指示符用于告知是否希望使用所述内 部通道进行所述第一呼叫和第二呼叫的用户面语音的传输。
9、 一种基站控制器 BSC, 包括发送消息模块和建立内部通道模块, 其中:
所述发送消息模块设置成: 在所述 BSC作为源 BSC使用时, 发送的切 换要求消息, 以使: 移动交换中心 MSC在接收到所述源 BSC发送的切换要 求消息后向所述目标 BSC发送携带本地通话标识符的切换请求消息, 所述本 地通话标识符用于标识所述第二呼叫;
所述建立内部通道模块设置成: 在所述 BSC作为目标 BSC使用时, 该 目标 BSC在接收到 MSC发送的切换请求消息后, 根据所述本地通话标识符 建立用于不经过核心网在所述第一呼叫和第二呼叫的用户之间传输所述第一 呼叫和第二呼叫的用户面语音的内部通道, 并且在接收到目标基站 BTS发送 的切换发现消息后, 使用所述内部通道传输所述第一呼叫和第二呼叫的用户 面语音。
10、 如权利要求 9所述的 BSC, 其中:
所述建立内部通道模块还设置成: 在所述 BSC作为目标 BSC使用时, 该目标 BSC还在建立所述内部通道后、接收到所述目标 BTS发送的切换发现 消息前, 根据所述第二呼叫的当前状态判断是否允许使用所述内部通道传输 所述第一呼叫和第二呼叫的用户面语音, 仅当判断结果为允许时才使用所述 内部通道传输所述第一呼叫和第二呼叫的用户面语音。
11、 一种基站系统, 其包括如权要求 9或 10所述的 BSC作为源 BSC和 目标 BSC使用。
12、 一种移动通信系统, 包含源基站系统、 目标基站系统和 MSC; 所述 源基站系统中包含源 BSC , 所述目标基站系统中包含目标 BSC和目标 BTS , 其中:
所述 MSC设置成在接收到所述源 BSC发送的切换要求消息后, 判断该 消息对应的第一呼叫在切换后是否与第二呼叫构成本地通话, 如果是, 则向 所述目标 BSC发送携带本地通话标识符的切换请求消息; 所述本地通话标识 符用于标识所述第二呼叫; 所述目标 BSC设置成在接收到所述切换请求消息后,根据所述本地通话 标识符建立用于不经过核心网在所述第一呼叫和第二呼叫的用户之间传输所 述第一呼叫和第二呼叫的用户面语音的内部通道, 并且在接收到所述目标 BTS发送的切换发现消息后, 使用所述内部通道传输所述第一呼叫和第二呼 叫的用户面语音。
13、 如权利要求 12所述的系统, 其中:
所述 BSC还设置成: 在作为目标 BSC使用时, 该目标 BSC还在建立所 述内部通道后、 接收到所述目标 BTS发送的切换发现消息前, 根据所述第二 呼叫的当前状态判断是否允许使用所述内部通道传输所述第一呼叫和第二呼 叫的用户面语音, 仅当判断结果为允许时才使用所述内部通道传输所述第一 呼叫和第二呼叫的用户面语音。
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