WO2010102584A1 - Procédé de transfert d'appel dans un système de station de base et système de communication mobile - Google Patents

Procédé de transfert d'appel dans un système de station de base et système de communication mobile 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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WO
WIPO (PCT)
Prior art keywords
call
bsc
internal
handover
local
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Application number
PCT/CN2010/071025
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English (en)
Chinese (zh)
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/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0064—Transmission or use of information for re-establishing the radio link of control information between different access points
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link

Definitions

  • the present invention relates to the field of 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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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention porte sur un procédé de transfert d'appel dans un système de station de base (BSS), sur un contrôleur de station de base (BSC), sur un BSS et sur un système de communication mobile. Le procédé comprend les étapes suivantes : un centre de commutation mobile (MSC) transmet un message d'instruction de transfert interne au BSC après qu'il a reçu un message de transfert requis interne transmis par le BSC; si le BSC détermine que le premier appel correspondant au message d'instruction de transfert interne et le second appel dans le BSC constituent un appel local après le transfert du premier appel, il établit un canal interne et achève les opérations de transfert suivantes après réception du message d'instruction de transfert interne, le canal interne étant utilisé pour transmettre la parole de plan utilisateur du premier appel et du second appel entre le premier utilisateur en communication et le second utilisateur en communication sans passer par un cœur de réseau. L'invention permet que la parole de plan utilisateur des communications constituant l'appel local soit transmise directement sans passer par une passerelle multimédia (MGW) du cœur de réseau après achèvement du transfert d'appel dans le BSS. Le gaspillage de ressources de transmission de l'interface Abis et de l'interface A est évité.
PCT/CN2010/071025 2009-03-13 2010-03-12 Procédé de transfert d'appel dans un système de station de base et système de communication mobile WO2010102584A1 (fr)

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CN200910117866A CN101835219A (zh) 2009-03-13 2009-03-13 一种基站系统内的呼叫切换方法及移动通信系统
CN200910117866.X 2009-03-13

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CN102238661B (zh) * 2010-04-30 2015-06-03 中兴通讯股份有限公司 一种本地交换时的切换系统及切换方法
CN109600807B (zh) * 2018-12-29 2021-06-22 华为技术服务有限公司 寻呼的方法和无线网络控制器

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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、核心网设备及网络系统
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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Publication number Priority date Publication date Assignee Title
CN1376372A (zh) * 1999-09-29 2002-10-23 诺基亚公司 基站控制器内执行的切换
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
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、核心网设备及网络系统

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