WO2010102584A1 - 一种基站***内的呼叫切换方法及移动通信*** - Google Patents

一种基站***内的呼叫切换方法及移动通信*** Download PDF

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Publication number
WO2010102584A1
WO2010102584A1 PCT/CN2010/071025 CN2010071025W WO2010102584A1 WO 2010102584 A1 WO2010102584 A1 WO 2010102584A1 CN 2010071025 W CN2010071025 W CN 2010071025W WO 2010102584 A1 WO2010102584 A1 WO 2010102584A1
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Prior art keywords
call
bsc
internal
handover
local
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PCT/CN2010/071025
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English (en)
French (fr)
Inventor
李靖
王欣晖
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中兴通讯股份有限公司
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Publication of WO2010102584A1 publication Critical patent/WO2010102584A1/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
    • H04W36/0055Transmission or use of information for re-establishing the radio link
    • H04W36/0064Transmission or use of information for re-establishing the radio link of control information between different access points
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0055Transmission or use of information for re-establishing the radio link

Definitions

  • the present invention relates to the field of communications, and in particular, to a call handover method and a mobile communication system in a base station system (BSS).
  • BSS base station system
  • GSM Global System for Mobile Communications
  • MSC Mobile Switching Center Server
  • MGW Media Gateway
  • BSC Base Station Controller
  • BSC Base Station Controller
  • MSC Mobile Switching Center Server
  • MGW Media Gateway
  • 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 in a 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 BSC;
  • the BSC sends an Internal Handover Required message to the MSC.
  • the MSC sends an Internal Handover Command message to the BSC.
  • the BSC sends a Channel Activation message to the BTS2 of the target cell to activate the channel.
  • the BTS2 After receiving the channel activation message, the BTS2 sends a channel activation confirmation (Channel) to the BSC. Activation Acknowledge ) message;
  • the BSC After receiving the channel activation confirmation message sent by the BTS2, the BSC sends a Handover Command message to the BTS1, and the BTS1 forwards the message to the MS;
  • the MS After receiving the handover command message, the MS attempts to access from the BTS2, and sends a Handover Access message to the BTS2;
  • the BTS2 After receiving the Handover Access message sent by the MS, the BTS2 sends a Handover Detect message to the BSC.
  • BTS2 sends a PHY INFO (physical information) message to the MS, which includes synchronization information such that the MS can correctly access the content;
  • the MS After receiving the PHY INFO, the MS sends SABM (Set Asynchronous Balanced)
  • the BTS2 After receiving the SABM frame, the BTS2 sends an Establish IND message to the BSC to notify the BSC that the radio link is established.
  • the BTS2 responds 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 BSC, to notify the BSC that the handover is completed.
  • the BSC sends a handover complete message to the MSC.
  • the user plane voice of the calling party is transmitted from the BSC to the 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.
  • 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 (BTS under the same BTS cluster). All belong to one BSC), or belong to the same BSC. For these local calls, if the current call processing flow is followed: 1) For calls belonging to the same BTS, the user's voice of the calling party will pass.
  • 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; 2)
  • the user plane voice of the calling party is transmitted to the control BTS of the BTS cluster through the Abis port of the BTS, and the control BTS of the BTS cluster passes the Abis port again.
  • the user plane voice 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 control BTS of the original BTS cluster, and the original BTS cluster.
  • 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.
  • Abis port and A interface transmit resource waste call forwarding method within BSS and mobile communication system.
  • the present invention provides a call handover method in a base station system, including:
  • the mobile switching center MSC After receiving the internal handover request message sent by the base station controller BSC, the mobile switching center MSC sends an internal handover command message to the BSC;
  • the BSC learns that the first call corresponding to the internal handover command message forms a local call with the second call in the BSC after the handover, after the internal handover command message is received, it is established to not pass through the core.
  • the network transmits an internal channel of the user plane voice of the first call and the second call between the users of the first call and the second call, and completes a subsequent handover operation.
  • the above method may also have the following features:
  • the method further includes:
  • the MSC determines that the first call corresponding to the internal handover request message is after the handover No, the second call in the BSC constitutes a local call, and if yes, the internal call command message carries a local call identifier for identifying the second call;
  • the BSC learns that the first call corresponding to the internal handover command message forms a local call with the second call in the BSC after the handover: the BSC learns that the first call is switching according to the local call identifier The local call is then made up with the second call.
  • 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 BSC establishing the internal channel includes:
  • the BSC selects a voice coding mode for the first call, and compares voice coding modes of the first call and the second call:
  • the BSC establishes a user plane that directly transmits the first call and the second call between users of the first call and the second call.
  • voice coding for the first call or the second call is set in the internal channel
  • the codec unit that performs the conversion is
  • the above method may also have the following features:
  • the BSC After receiving the handover complete message sent by the target base station BTS, the BSC removes the connection between the first call and the second call for transmitting user plane voice on the A interface, and sends a handover complete message to the MSC. ;
  • the MSC After receiving the handover complete message, the MSC removes the connection between the first call and the second call on the A interface for transmitting user plane voice.
  • the above method may also have the following features:
  • the local call local exchange completion indicator is for identifying 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 BSC learns that the first call forms a local call with the second call in the BSC after the handover, in the step of transmitting the internal handover request message,
  • the BSC adds a local call local exchange indicator to the internal handover request message, where the indicator is used to notify the MSC to use the internal channel to perform the first call and after the first call handover is completed.
  • the above method may also have the following features:
  • the MSC joins a local exchange indicator in the internal handover command message, the indicator being used to inform whether it is desired to use the internal channel to transmit the user plane voice of the first call and 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 send an internal handover request message to the mobile switching center MSC, so that the MSC sends an internal handover command message to the BSC after receiving the internal handover request message sent by the BSC;
  • the establishing an internal channel module is configured to: after receiving the internal handover command message, if the first call corresponding to the message forms a local call with the second call in the BSC after the handover, establishing The network transmits an internal channel of the user plane voice of the first call and the second call between the users of the first call and the second call, and performs the first call and the second call using the internal channel User plane voice transmission.
  • the present invention provides a base station system, and the base station system includes the above BSC.
  • a mobile communication system comprising a base station system, a mobile switching center MSC; the base station system Contains BSC, where:
  • the MSC is configured to send an internal handover command message to the BSC after receiving the internal handover request message sent by the BSC;
  • the BSC is configured to: after receiving the internal handover command message, if the first call corresponding to the message forms a local call with the second call in the BSC after the handover, establishing, for not using the core network Transmitting an internal channel of the user plane voice of the first call and the second call between the users of the first call and the second call, and using the internal channel to perform user plane voice of the first call and the second call Transmission.
  • the MSC is further configured to: after receiving the internal handover request message, before sending the internal handover command message, determining whether the first call corresponding to the internal handover request message is in the BSC after the handover The second call constitutes a local call, and if so, the internal handover command message carries a local call identifier for identifying the second call.
  • the method and system of the present invention establishes an internal channel for transmitting user plane voice without passing through the core network in the BSS, so that after completing the call handover in the BSS, the user who constitutes the call of the local call is used.
  • 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.
  • FIG. 1 is a call switching flow diagram in a BSS (including BSC and BTS) in a conventional GSM system;
  • 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;
  • FIG. 4 is a flow chart of call handover in a BSS (including a BSC and a BTS) in a GSM system according to an embodiment of the present invention
  • 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 transmit it to the MS2 through the MGW of the core network; the user plane voice 2 sent by the MS2 is similar.
  • the mobile communication system capable of realizing the local exchange local exchange function in the embodiment of the present invention will be described below.
  • 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 comprises: BSS, MSC, and BSS including BSC, BTS1 and BTS2. Specifically, the MSC obtains the target BSC for performing call handover according to the internal handover request message sent by the BSC, and the MSC determines whether the corresponding call constitutes a local after the handover, in addition to performing the functions specified by the existing protocol.
  • a local call identifier for identifying the local call in the internal handover command message sent to the target BSC, the identifier is used to inform the target BSC of the call that needs to be handed over (may Called as the first call) Which call (which may be referred to as the second call) under the BSC constitutes a local call after the handover.
  • the BSC After receiving the internal handover command message sent by the MSC, the BSC learns, according to the local call identifier in the message, the call that needs to be handed over (the first call) and the call that is under service (the second call) constitute a local call;
  • the BSC establishes a BSS internal channel for the local call local exchange of the two calls.
  • the internal channel can be established inside a BTS, or can be established inside a BTS cluster, or can be established inside a BSC.
  • the local call local exchange completion indicator is added to the handover complete message replied to the MSC, and the indicator is used to inform the MSC of the call (first call). Use the local call local exchange feature after the switch is complete.
  • the BSC and the MSC use the local call local switching function after completing the handover, and remove the handover at the same time.
  • 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 send an internal handover request message to the mobile switching center MSC, so that the MSC sends an internal handover command message to the BSC after receiving the internal handover request message sent by the BSC;
  • the establishing an internal channel module is configured to: after receiving the internal handover command message, if the first call corresponding to the message forms a local call with the second call in the BSC after the handover, establishing The network transmits an internal channel of the user plane voice of the first call and the second call between the users of the first call and the second call, and performs the first call and the second call using the internal channel User plane voice transmission.
  • FIG. 4 is a flow chart of call switching in a BSS (including BSC and BTS) in the GSM system according to an embodiment of the present invention. As shown in FIG. 4, 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 BSC.
  • the BSC sends an Internal Handover Required message to the MSC.
  • the MSC After receiving the internal handover request message sent by the BSC, the MSC learns the target BSC that performs the call handover, and determines whether the call (first call) constitutes a local call with the second call after the handover (the specific judgment algorithm belongs to the prior art). If yes, the MSC enters the local call identifier in the Internal Handover Command message sent to the target BSC;
  • the local call identifier may be: a circuit identification code (CIC) or another party call (second call) of another party call (second call) that can make a local call with the to-be-switched call (first call) Call Identifier (CI).
  • CIC circuit identification code
  • second call another party call of another party call
  • CI Call Identifier
  • the above circuit identification number is the existing circuit identifier in the protocol (for the flag bearer in TDM)
  • the A-interface call on the Transport) is the existing Call ID in the protocol (used to mark the A-interface call carried on the IP 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 BSC sends a Channel Activation message to the BTS2 of the target cell to activate the channel; after receiving the channel activation message, the BTS2 sends a Channel Activation Acknowledge message to the BSC;
  • the BSC after receiving the internal handover command sent by the MSC, the BSC can know that the call being handed over (the first call) and the other call represented by the local call identifier (the second call) constitute a local call; therefore, the BSC is completed.
  • an internal channel for transmitting user plane voice is also established in the BSS, and after receiving the user plane voice sent by the MS, the user plane is transmitted between the two users of the local call through the internal channel. voice.
  • 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 1:
  • 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 MS sends a Handover Complete message to the BTS2, and the BTS2 forwards the handover complete message to the BSC to notify the BSC that the handover is complete.
  • the BSC sends a handover complete message to the MSC.
  • the local exchange local completion indicator is added to the handover completion message sent to the MSC, and the MSC can learn whether the local call has been locally exchanged by using the local call. The function.
  • the BSC After receiving the handover complete message sent by the MS through the BTS2, the BSC removes the connection between the BSC and the MGW for transmitting the user plane voice between the two parties (the first call that performs the handover and the second call that does not perform the handover). Receiving, by the MSC, the handover complete message carrying the local exchange local exchange completion indicator, and the indicator indicates that when the local exchange function is used, the two parties are disconnected (the first call for handover and the second call for handover) A connection between the BSC and the MGW for transmitting user plane voice.
  • the local call local exchange completion indicator can be in the format shown in FIG.
  • the local call local exchange completion 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 2:
  • bit 1 when the value of bit 1 is 1, it indicates that the call has used the local switching function. When the value of bit 1 is 0, it indicates that the call does not use the local switching function.
  • the foregoing embodiment has various transformation manners, for example: If the internal handover request message is sent in step 402, the BSC knows that the to-be-switched call (first call) is after the handover with the BSC. A certain call (second call) constitutes a local call. For example, before the handover, the BSC has learned that the call is a local call during the call setup process, and may add a local call local to the internal handover request message. Exchanging an indicator, informing the MSC that the handover call (first call) will use the local call local exchange function after the handover; in this case, the local handover command message sent by the MSC to the BSC may not join the local call Identifier
  • the MSC may add a local exchange indicator to the handover request message sent to the BSC, where the indicator is used to inform the BSC whether it wants to This local call uses the local exchange feature.
  • the indicator can be in the format shown in Figure 6, where the local exchange indicator occupies 8 bits and the lower bit 1 is used to indicate whether it is desirable to use the local call local exchange function, and other bits can be reserved.
  • the value of bit 1 is shown in Table 3:
  • the present invention provides a call handover method and a mobile communication system in a base station system
  • An internal channel for transmitting user plane voice without passing through the core network is established in the BSS, so that after the call switching in the BSS is completed, the user plane voice of the call constituting the local call can be directly transmitted without passing through the MGW of the core network, avoiding the Abis port.
  • the waste of transmitting resources with the A interface is established in the BSS, so that after the call switching in the BSS is completed, the user plane voice of the call constituting the local call can be directly transmitted without passing through the MGW of the core network, avoiding the Abis port.

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Abstract

本发明公开了一种基站***内的呼叫切换方法、BSC、基站***以及移 动通信***, 其中, 所述方法包括: 接收到 BSC发送的内部切换要求消息后, MSC向所述 BSC发送内部切换命令消息;若所述 BSC获知所述内部切换命 令消息对应的第一呼叫在切换后与所述 BSC中的第二呼叫构成本地通话, 则 在接收到所述内部切换命令消息后,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,并完成后续的切换操作。本发明使得在完成 BSS内的呼叫切换后,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。

Description

一种基站***内的呼叫切换方法及移动通信***
技术领域
本发明涉及通信领域, 尤其涉及一种基站***(BSS ) 内的呼叫切换方 法及移动通信***。
背景技术
在现有的全球移动通讯*** ( 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 )、 媒体网关( Media Gateway, 简称为 MGW )与基站控 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; 此外 , BTS与 BSC之间通过 Abis接 口连接。 其中, MSC用于控制面相关功能的管理, MGW用于用户语音的管 理。
GSM ***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***中的 BSS (包含 BSC和 BTS ) 内的呼叫切换流 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 BSC;
102: BSC向 MSC发送内部切换要求( Internal Handover Required )消息;
103: MSC向 BSC发送内部切换命令 ( Internal Handover Command ) 消 息;
104: BSC向目标小区的 BTS2发送信道激活( Channel Activation )消息, 以激活信道;
105: BTS2收到信道激活消息后, 向 BSC发送信道激活确认(Channel Activation Acknowledge ) 消息;
106 : BSC 收到 BTS2 发送的信道激活确认消息后, 发送切换命令 ( Handover Command ) 消息给 BTS 1 , 由 BTS 1将该消息转发给 MS;
107: MS接收到切换命令消息后, 尝试从 BTS2接入, 发送切换接入 ( Handover Access ) 消息给 BTS2;
108: BTS2收到 MS发送的切换接入(Handover Access ) 消息后, 发送 切换发现( Handover Detect ) 消息给 BSC;
109 - 110: 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;
111 : 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;
112: BTS2收到 SABM帧后,发送建立指示( Establish IND )消息给 BSC, 通知 BSC无线链路建立;
113 : 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;
114: MS发送切换完成( Handover Complete )消息给 BTS2, BTS2转发 切换完成消息给 BSC, 通知 BSC切换完成;
115: BSC发送切换完成消息给 MSC。
目前在 GSM***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 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***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内的呼叫切换方法及移动通信***。
为了解决上述技术问题, 本发明提供一种基站***内的呼叫切换方法, 包括:
接收到基站控制器 BSC发送的内部切换要求消息后,移动交换中心 MSC 向所述 BSC发送内部切换命令消息;
若所述 BSC获知所述内部切换命令消息对应的第一呼叫在切换后与所述 BSC中的第二呼叫构成本地通话, 则在接收到所述内部切换命令消息后, 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, 并完成后续的切换操作。
进一步地, 上述方法还可具有以下特点:
在接收到所述内部切换要求消息后、 发送所述内部切换命令消息前, 还 包括:
所述 MSC 判断所述内部切换要求消息对应的所述第一呼叫在切换后是 否与所述 BSC中的第二呼叫构成本地通话, 如果是, 则在所述内部切换命令 消息中携带用于标识所述第二呼叫的本地通话标识符;
所述 BSC 获知所述内部切换命令消息对应的第一呼叫在切换后与所述 BSC中的第二呼叫构成本地通话是:所述 BSC根据所述本地通话标识符获知 所述第一呼叫在切换后与所述第二呼叫构成本地通话。
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 BSC建立所述内部通道的步骤包括:
所述 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 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 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 BSC完成后续的切换操作的步骤中:
所述 BSC接收到所述切换的目标基站 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, 并向所述 MSC发送切换完成消息;
所述 MSC接收到所述切换完成消息后,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。
进一步地, 上述方法还可具有以下特点:
所述 BSC向所述 MSC发送切换完成消息中包含本地通话本地交换完成 指示符;
所述本地通话本地交换完成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:
在发送的所述内部切换要求消息之前,如果所述 BSC获知所述第一呼叫 在切换后与所述 BSC中的第二呼叫构成本地通话, 则在发送的内部切换要求 消息的步骤中,
所述 BSC在所述内部切换要求消息中加入本地通话本地交换指示符, 该 指示符用于告知所述 MSC在所述第一呼叫切换完成后将使用所述内部通道 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向所述 BSC发送内部切换命令消息的步骤中,
所述 MSC在所述内部切换命令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向移动交换中心 MSC发送内部切换要求消息, 以使所述 MSC在接收到所述 BSC发送的内部切换要求消息后向所述 BSC发 送内部切换命令消息;
所述建立内部通道模块设置成在接收到所述内部切换命令消息后, 若该 消息对应的第一呼叫在切换后与所述 BSC中的第二呼叫构成本地通话, 则建 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***, 所述基站***包含 上述的 BSC。
一种移动通信***, 包含基站***、 移动交换中心 MSC; 所述基站*** 包含 BSC, 其中:
所述 MSC设置成在接收到所述 BSC发送的内部切换要求消息后, 向所 述 BSC发送内部切换命令消息;
所述 BSC设置成在接收到所述内部切换命令消息后, 若该消息对应的第 一呼叫在切换后与所述 BSC中的第二呼叫构成本地通话, 则建立用于不经过 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***还可具有以下特点:
所述 MSC还设置成在接收到所述内部切换要求消息后、发送所述内部切 换命令消息前, 判断所述内部切换要求消息对应的所述第一呼叫在切换后是 否与所述 BSC中的第二呼叫构成本地通话, 如果是, 则在所述内部切换命令 消息中携带用于标识所述第二呼叫的本地通话标识符。
综上所述, 釆用本发明的方法及***, 通过在 BSS内建立用于不经过核 心网传输用户面语音的内部通道, 使得在完成 BSS内的呼叫切换后, 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***中的 BSS (包含 BSC和 BTS ) 内的呼叫切换流 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***中的 BSS (包含 BSC和 BTS ) 内的呼叫 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,由 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***
(例如, GSM***)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***中包含: BSS、MSC, BSS中包含 BSC、BTS1和 BTS2。 具体地说, MSC除了完成现有协议规定的功能外,在进行 BSS内切换时, MSC根据 BSC发送的内部切换要求消息获知进行呼叫切换的目标 BSC, MSC 判断对应的呼叫在切换后是否构成本地通话, 如果是, 则在发送给目标 BSC 的内部切换命令消息中添加用于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。
BSC在收到 MSC发送的内部切换命令消息后, 根据该消息中的本地通 话标识符获知需要进行切换的呼叫 (第一呼叫)与哪个正在其服务下的呼叫 (第二呼叫)构成本地通话; BSC建立用于这两个呼叫的本地通话本地交换 的 BSS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。
BSC完成建立所述内部通道, 并决定使用本地通话本地交换功能后, 在 回复给 MSC的切换完成消息中加入本地通话本地交换完成指示符,该指示符 用于告知 MSC该呼叫(第一呼叫)在切换完成后使用本地通话本地交换功能。
BSC和 MSC在完成切换后使用本地通话本地交换功能, 同时拆除切换 呼叫 (第一呼叫)和与切换呼叫 (第一呼叫)构成本地通话的另一方 (未进 行切换的第二呼叫) 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向移动交换中心 MSC发送内部切换要求消息, 以使所述 MSC在接收到所述 BSC发送的内部切换要求消息后向所述 BSC发 送内部切换命令消息;
所述建立内部通道模块设置成在接收到所述内部切换命令消息后, 若该 消息对应的第一呼叫在切换后与所述 BSC中的第二呼叫构成本地通话, 则建 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。
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***中的 BSS (包含 BSC和 BTS ) 内的呼叫 切换流程图, 如图 4所示, 该流程包括如下步骤:
401 : MS向 BTS1发送测量才艮告 ( Measurement Report ) , BTS 1再将测 量报告转发给 BSC;
402: BSC向 MSC发送内部切换要求( Internal Handover Required )消息;
403: 收到 BSC发送的内部切换要求消息后, MSC获知进行呼叫切换的 目标 BSC, 判断该呼叫 (第一呼叫)在切换后是否与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发送的内 部切换命令 ( Internal Handover Command ) 消息中力口入本地通话标识符;
本地通话标识符可以是: 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。
404 ~ 405: BSC向目标小区的 BTS2发送信道激活 ( Channel Activation ) 消息, 以激活信道; BTS2收到信道激活消息后, 向 BSC发送信道激活确认 ( Channel Activation Acknowledge ) 消息;
此外, BSC在收到 MSC发送的内部切换命令后, 可以获知正在切换的 呼叫 (第一呼叫) 与本地通话标识符所表示的另一呼叫 (第二呼叫)构成本 地通话; 因此, BSC除完成无线信道的切换外, 还要在 BSS内部建立用于传 输用户面语音的内部通道, 并在收到 MS发送的用户面语音后, 通过该内部 通道在本地通话的双方用户之间相互传递用户面语音。
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 1所示:
Figure imgf000011_0001
4 N Y Y Y N
5 N Y N Y N
6 N N Y N N 表 1
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。
406 - 413: 与步骤 106 ~ 113相同;
414: MS发送切换完成( Handover Complete )消息给 BTS2, BTS2转发 切换完成消息给 BSC, 通知 BSC切换完成;
415: BSC发送切换完成消息给 MSC;
BSC在上述内部通道建立完成, 并使用本地交换后, 在发送给 MSC的 上述切换完成消息中加入本地通话本地交换完成指示符, MSC可以通过该指 示符获知该本地通话是否已经使用本地通话本地交换的功能。
此外, BSC在接收到 MS通过 BTS2发送的切换完成消息后, 拆除通话 双方(进行切换的第一呼叫和未进行切换的第二呼叫)的 BSC与 MGW之间 的用于传输用户面语音的连接; MSC在收到携带本地通话本地交换完成指示 符的上述切换完成消息, 且该指示符表示使用了本地交换功能时, 拆除通话 双方(进行切换的第一呼叫和未进行切换的第二呼叫的 BSC与 MGW之间的 用于传输用户面语音的连接。
优选的, 本地通话本地交换完成指示符可以釆用如图 6所示的格式, 其 中, 本地通话本地交换完成指示符占用 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 2:
Figure imgf000013_0001
表 2
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能, 当比特 1的取值为 0时, 表示该呼叫未使用本地交换功能。
根据本发明的核心思想, 上述实施例还有多种变换方式, 例如: 如果在步骤 402中, 发送所述内部切换要求消息时, BSC知道待切换呼 叫(第一呼叫)在切换后与该 BSC中的某一呼叫(第二呼叫)构成本地通话, 例如, 在此次切换之前, BSC已经通过呼叫建立过程中获知该呼叫是本地通 话, 则可以在所述内部切换要求消息中添加本地通话本地交换指示符, 告知 MSC待切换呼叫 (第一呼叫)在切换后将使用本地通话本地交换的功能; 在 这种情况下, 在 MSC发送给 BSC的所述内部切换命令消息中可以不加入本 地通话标识符
可选的, MSC为了明确告知 BSC, 其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是否希望其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来指示是否希望使用本地通话本地交换功能, 其他比特位可以 预留。 比特 1的取值如表 3所示:
Figure imgf000013_0002
表 3 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***内的呼叫切换方法及移动通信***, 通过在
BSS内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 内的呼叫切换后, 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***内的呼叫切换方法, 包括:
接收到基站控制器 BSC发送的内部切换要求消息后,移动交换中心 MSC 向所述 BSC发送内部切换命令消息;
若所述 BSC获知所述内部切换命令消息对应的第一呼叫在切换后与所述
BSC中的第二呼叫构成本地通话, 则在接收到所述内部切换命令消息后, 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, 并完成后续的切换操作。
2、 如权利要求 1所述的方法, 其中:
在接收到所述内部切换要求消息后、 发送所述内部切换命令消息前, 还 包括:
所述 MSC 判断所述内部切换要求消息对应的所述第一呼叫在切换后是 否与所述 BSC中的第二呼叫构成本地通话, 如果是, 则在所述内部切换命令 消息中携带用于标识所述第二呼叫的本地通话标识符;
所述 BSC 获知所述内部切换命令消息对应的第一呼叫在切换后与所述
BSC中的第二呼叫构成本地通话是:所述 BSC根据所述本地通话标识符获知 所述第一呼叫在切换后与所述第二呼叫构成本地通话。
3、 如权利要求 2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。
4、 如权利要求 1所述的方法, 其中:
所述 BSC建立所述内部通道的步骤包括:
所述 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 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 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。
5、 如权利要求 1所述的方法, 其中:
在所述 BSC完成后续的切换操作的步骤中:
所述 BSC接收到所述切换的目标基站 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, 并向所述 MSC发送切换完成消息;
所述 MSC接收到所述切换完成消息后,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。
6、 如权利要求 5所述的方法, 其中:
所述 BSC向所述 MSC发送切换完成消息中包含本地通话本地交换完成 指示符;
所述本地通话本地交换完成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。
7、 如权利要求 1所述的方法, 其中:
在发送的所述内部切换要求消息之前,如果所述 BSC获知所述第一呼叫 在切换后与所述 BSC中的第二呼叫构成本地通话, 则在发送的内部切换要求 消息的步骤中,
所述 BSC在所述内部切换要求消息中加入本地通话本地交换指示符, 该 指示符用于告知所述 MSC在所述第一呼叫切换完成后将使用所述内部通道 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向所述 BSC发送内部切换命令消息的步骤中,
所述 MSC在所述内部切换命令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向移动交换中心 MSC发送内部切换要求消息, 以使所述 MSC在接收到所述 BSC发送的内部切换要求消息后向所述 BSC发 送内部切换命令消息;
所述建立内部通道模块设置成在接收到所述内部切换命令消息后, 若该 消息对应的第一呼叫在切换后与所述 BSC中的第二呼叫构成本地通话, 则建 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。
10、 一种基站***, 所述基站***包含如权利要求 9所述的 BSC。
11、 一种移动通信***, 包含基站***、 移动交换中心 MSC; 所述基 站***包含 BSC, 其中:
所述 MSC设置成在接收到所述 BSC发送的内部切换要求消息后, 向所 述 BSC发送内部切换命令消息;
所述 BSC设置成在接收到所述内部切换命令消息后, 若该消息对应的第 一呼叫在切换后与所述 BSC中的第二呼叫构成本地通话, 则建立用于不经过 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。
12、 如权利要求 11所述的***, 其中:
所述 MSC还设置成在接收到所述内部切换要求消息后、发送所述内部切 换命令消息前, 判断所述内部切换要求消息对应的所述第一呼叫在切换后是 否与所述 BSC中的第二呼叫构成本地通话, 如果是, 则在所述内部切换命令 消息中携带用于标识所述第二呼叫的本地通话标识符。
PCT/CN2010/071025 2009-03-13 2010-03-12 一种基站***内的呼叫切换方法及移动通信*** WO2010102584A1 (zh)

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CN1376372A (zh) * 1999-09-29 2002-10-23 诺基亚公司 基站控制器内执行的切换
CN101159905A (zh) * 2007-11-07 2008-04-09 华为技术有限公司 基站控制器内实现本地交换方法、核心网设备及网络***
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CN101325795A (zh) * 2007-06-15 2008-12-17 中兴通讯股份有限公司 适于本地语音交换的无线通信设备
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