WO2010111966A1 - 基站控制器、移动交换中心及呼叫方式的转换方法 - Google Patents

基站控制器、移动交换中心及呼叫方式的转换方法 Download PDF

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Publication number
WO2010111966A1
WO2010111966A1 PCT/CN2010/071527 CN2010071527W WO2010111966A1 WO 2010111966 A1 WO2010111966 A1 WO 2010111966A1 CN 2010071527 W CN2010071527 W CN 2010071527W WO 2010111966 A1 WO2010111966 A1 WO 2010111966A1
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WO
WIPO (PCT)
Prior art keywords
port circuit
base station
conversion
station controller
switching center
Prior art date
Application number
PCT/CN2010/071527
Other languages
English (en)
French (fr)
Inventor
茅非
唐雪
Original Assignee
中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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 EP10758068.0A priority Critical patent/EP2416607B1/en
Priority to CN201080014843.7A priority patent/CN102388655B/zh
Publication of WO2010111966A1 publication Critical patent/WO2010111966A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/10Reselecting an access point controller
    • 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
    • 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

Definitions

  • the present invention relates to the field of communications, and in particular to a base station controller, a mobile switching center, and a method for converting a call mode.
  • GSM Global System for Mobile Communications
  • MSC Server Mobile Switching Center Server
  • BSC Base Station Controller
  • the base station (Base Transceiver Station, BTS for short) is connected to the BSC through the Abis interface, and the mobile terminal (Mobile Station, MS for short) communicates with the BTS through the air interface Um interface. .
  • the user plane voice of the calling party is transmitted to the media gateway (Media Gateway, referred to as MGW) through the BSC, and then transmitted by the MGW to the BSC of the calling peer.
  • MGW Media Gateway
  • 1 is a schematic block diagram of the structure between the MGW, the BSC, and the BTS of the related art. As shown in FIG. 1, the MGW can communicate with multiple BSCs under its control, and the BSC can communicate with multiple BTSs under its subordinate, where the MGW and the BSC Communicate through the A port.
  • LS Local Switch
  • the BSC performs handover operations (including intra-BSC handover and inter-BSC handover in some cases). If the call continues to use the local switching method, it will cause the call to fail.
  • the user of the BSC may apply for a value-added service that is not applicable to the local exchange, or may be inconsistent because the voice version of the master/called party after the handover in the BSC is inconsistent.
  • the present invention has been made in view of the problem of a call failure caused by using a local exchange for a local call in a call that is not applicable to a local exchange. To this end, the present invention aims to provide a call mode conversion scheme to solve the above problems. In order to achieve the above object, according to an aspect of the present invention, a method of converting a call mode is provided.
  • the method for converting a call mode comprises: the mobile switching center transmitting a conversion notification message; and the base station controller establishing an A-port circuit for the locally exchanged call parties according to the conversion notification message received from the mobile switching center. Further, before the mobile switching center sends the conversion notification message, the method further includes: the mobile switching center pre-assigns the A-port circuit to the calling parties, and the conversion notification message carries the information of the A-port circuit allocated by the mobile switching center to the calling parties, and the base station The controller establishes the A port circuit based on the information.
  • the method includes: the base station controller sends a conversion request message to the mobile switching center, where the conversion request message is used to request to tear down the locally exchanged connection. Further, before the mobile switching center allocates the A-port circuit to the calling party in advance, and sends a conversion notification message, the method further includes: the base station controller sending a conversion request message to the mobile switching center, where the conversion request message is Used to request the removal of a locally switched connection. Further, the conversion request message sent by the base station controller to the mobile switching center includes: the base station controller sends a conversion request message to the mobile switching center, where the conversion request message carries the A port circuit allocated by the base station controller for the calling party information.
  • the method further includes: the base station controller tearing down the locally switched user plane link.
  • the information that carries the A port circuit in the conversion notification message includes: a respective identity of the first calling party and the second calling party in the calling party, information allocated to the A port circuit of the first calling party, and assignment to the second call.
  • the information of the A port circuit of the party; or the information of the A port circuit allocated to the calling party includes: information of the A port circuit assigned to one calling party, and information of the A port circuit assigned to another calling party.
  • the base station controller includes: a receiving module, configured to receive a conversion notification message sent by the mobile switching center, where the conversion notification message is used to instruct the base station controller to establish an A port circuit of both sides of the locally exchanged call; The A-port circuit is established for the calling parties of the local exchange according to the conversion notification message received by the receiving module.
  • the removal module is configured to remove the locally switched user plane link after the establishing module establishes the A-port circuit for the locally exchanged calling parties.
  • the base station controller further includes: a requesting module, configured to send a conversion request message to the mobile switching center, where the conversion request message is used to request to tear down the locally exchanged connection.
  • the allocating module is configured to allocate an A port circuit to the locally exchanged calling parties, wherein the information of the A port circuit is carried in the conversion request message sent by the requesting module.
  • a mobile switching center includes: an allocation module, an A-port circuit for allocating the two parties to the local exchange; and a sending module, configured to send a conversion notification message to the base station controller, where the conversion notification message carries the The information of the A port circuit.
  • the receiving module is configured to receive a conversion request message sent by the base station controller, where the conversion request message is used to request to tear down the locally exchanged connection.
  • the receiving module is further configured to receive a conversion complete message sent by the base station controller after the local switched user plane link is removed.
  • the base station controller separately establishes the A-port circuit for the two sides of the call according to the conversion notification message sent by the mobile switching center, and overcomes the above-mentioned related art to use the local call in the call that is not applicable to the local exchange.
  • the problem of the call failure caused by the exchange of the local call can be converted into a non-local exchange mode by the conversion of the call mode to implement a local call that is not applicable to the local exchange.
  • FIG. 1 is a schematic structural block diagram of a related art MGW, BSC, and BTS;
  • FIG. 2 is a flowchart of a method for converting a call mode in which an MSC actively initiates a conversion operation according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of a flow of inter-BSC handover in the related art
  • FIG. 5 is a BSC according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a flow of intra-BSC handover in which AoverIP is not implemented in the related art
  • FIG. 7 is a BSC intra-switching process in which AoverIP is not implemented according to an embodiment of the present invention;
  • FIG. 8 is a schematic diagram of a process of implementing intra-BSC handover of AoverIP in the related art
  • FIG. 9 is a call mode conversion in a BSC intra-switching process for implementing AoverIP according to an embodiment of the present invention
  • FIG. 10 is another schematic diagram of a call mode transition in a BSC intra-switching process for implementing AoverIP according to an embodiment of the present invention
  • FIG. 11 is a diagram of a B according to an embodiment of the present invention.
  • Block diagram of SC Figure 12 is a block diagram of an MSC in accordance with an embodiment of the present invention.
  • the embodiment of the present invention provides a conversion scheme of a call mode, that is, a conversion notification message sent by a base station controller in a mobile switching center, respectively, an A-port circuit is established for each side of the local call, and then the local exchange is removed. User plane link. In this way, both parties to the local call can use a non-local exchange to implement a local call for normal communication.
  • a method for converting a call mode includes a local exchange and a non-local exchange, and a local exchange is established on the BSC or the BTS.
  • the method for converting the call mode includes: the mobile switching center establishes an A-port circuit for the locally exchanged call parties and sends a conversion notification message; the BSC establishes an A-port circuit for the locally exchanged call parties according to the conversion notification message received from the mobile switching center.
  • the conversion notification message is used to instruct the BSC to establish an A port circuit.
  • both the MSC and the BSC need to establish an A-port circuit for the calling parties, wherein the BSC establishes an A-port circuit for the calling parties according to the received conversion notification message, so that the local exchange is not applicable.
  • the calling parties can communicate using the non-local exchange, which overcomes the problem of the call failure caused by using the local exchange for the local call in the local call that is not applicable to the local exchange in the related art, so that the calling parties can communicate normally.
  • the following describes the conversion process in detail by taking the MSC and the BSC to initiate a conversion operation as an example.
  • the MSC initiates a conversion operation
  • Call. 2 is a flowchart of a method for converting a call mode in which an MSC actively initiates a conversion operation according to an embodiment of the present invention. As shown in FIG. 2, in a call process after a local exchange is established, the MSC actively initiates a conversion operation, and the call mode is initiated.
  • the process of the conversion method includes: First, the MSC allocates an A-port circuit for each of the calling parties performing the conversion operation, and establishes an A-port circuit for the calling parties; then, the MSC sends a conversion notification message to the BSC, that is, the local exchange removal in FIG.
  • the notification message carries the A port circuit information newly allocated for both parties of the call.
  • the MSC sends the conversion notification message and the operation of establishing the A port circuit for the calling parties can determine the sequence according to the flow in the actual operation, and the present invention is not limited thereto.
  • the BSC After the BSC receives the local exchange teardown notification message, according to the information of the A port circuit carried in the message, the A port circuit can be separately established for the calling parties, that is, the connection between the calling parties and the A port is established respectively.
  • the BSC After the establishment of the A-port circuit, the BSC removes the locally switched user plane link and returns a conversion completion message to the MSC, that is, the local exchange teardown response message in FIG.
  • the local exchange teardown notification message sent by the MSC can be in the following two forms:
  • the A port circuit of the party indicates the A port circuit allocated to the calling party corresponding to the link transmitting the local exchange teardown notification message
  • the other party A port circuit indicates the A port circuit allocated to the other party of the call.
  • the A-port circuit information in this embodiment is represented by a TDM format. In actual operation, the A-port circuit information may also be represented by an IP format or other format.
  • the MSC actively initiates a conversion operation, notifies the local exchange connection in the base station controller to be removed, and re-establishes a new A-port circuit, thereby converting the local exchange to the non-local exchange, thereby avoiding the local exchange mode during the BSC handover. The resulting call failure has improved the performance of the system.
  • the BSC actively initiates a conversion operation, and the base station controller sends a conversion request message to the mobile switching center, where the conversion request message is used to request to initiate a conversion of the call mode; and in response to the conversion request message, the mobile switching center sends the conversion to the base station controller. Notification message. Specifically, if the base station controller supports the A-port circuit allocation, the base station controller may allocate the A-port circuit to the calling parties, and the conversion request message sent to the MSC at this time includes the information of the A-port circuit allocated by the base station controller to the calling parties.
  • the mobile switching center After receiving the conversion request message, the mobile switching center does not need to allocate the A port circuit to the calling parties, and the mobile switching center establishes the A port circuit for the calling parties according to the conversion request message. Then, the MSC sends a conversion notification message to the BSC, where the conversion notification message may carry the information of the A port circuit in the conversion request message, or may not carry the information. After the BSC receives the conversion notification message, the BSC can establish an A-port circuit for the calling parties to implement a local call exchanged by the Y. Of course, if the base station controller does not support the A-port circuit allocation, the conversion request message sent to the MSC is only used to request the initiation of the conversion of the call mode.
  • FIG. 3 is a flowchart of a method for converting a call mode in which a BSC actively initiates a conversion operation according to an embodiment of the present invention.
  • a BSC actively initiates a conversion operation, where, BSC Supporting the A-port circuit allocation
  • the flow of the call mode conversion method includes: First, the BSC sends a conversion request message to the MSC, that is, the local exchange teardown request message in FIG.
  • the BSC Since the BSC supports the A-port circuit allocation, the BSC allocates the A-port circuit to the calling parties, and carries the information of the assigned A-port circuit in the local exchange teardown request message to the MSC. If the BSC does not support the A-port circuit assignment, the BSC cannot allocate the A-port circuit to the calling parties. At this time, the sent local exchange teardown request message is only used to request to initiate the switching operation of the call mode.
  • the MSC After receiving the local exchange teardown request message, the MSC determines whether it is necessary to allocate the A port circuit for this conversion operation. If the local exchange teardown request message carries the information of the A port circuit, the MSC does not need to be allocated again, and only needs to confirm the information of the A port circuit; if the local exchange teardown request message does not carry the information of the A port circuit, That is, if the BSC does not allocate the information of the A port circuit, the MSC needs to allocate the A port circuit for each of the calling parties.
  • the MSC establishes a connection of the A port circuit for the calling parties according to the allocated A port circuit, and sends a conversion notification message, that is, the local exchange teardown notification message in the figure to the BSC. If the BSC does not allocate an A-port circuit, the local exchange removal notification message carries the information of the assigned A-port circuit. If the BSC allocates the A port circuit, it may or may not carry the information of the allocated A port circuit in the local exchange teardown notification message.
  • the BSC After receiving the local exchange teardown notification message, the BSC establishes a connection to the A port for both parties. After the establishment is completed, the BSC removes the locally switched user plane link and returns a local exchange teardown response message to the MSC.
  • the information of the A port circuit here may be the two forms described above, and will not be mentioned here.
  • the BSC actively initiates a conversion operation to notify the MSC of the conversion notification message. After the BSC receives the conversion notification message, the BSC uses the information of the A-port circuit carried in the conversion notification message as the locally exchanged caller.
  • the A-port circuit is established to convert the local exchange to the non-local exchange, which avoids the call failure caused by the local exchange mode during the BSC handover, thereby improving the performance and stability of the system.
  • the call mode caused by the handover between the BSCs or the BSCs is respectively taken as an example to The embodiment of the invention will be described in detail.
  • FIG. 4 is a schematic diagram of a flow of inter-BSC handover in the related art.
  • the BSC finds that an inter-BSC handover is required, and the BSC sends a handover request (Handover Required) to the MSC.
  • the MSC determines that the handover is an inter-BSC handover, and sends a handover request message (Handover Request) to the handover BSC of the handover user, and carries the information of the A interface circuit allocated for the handover user in the handover request message.
  • the cut-in BSC is for the handover user to activate the channel (Channel Active) on the cut-in BTS, and waits for the handover user to access. After the user accesses and the handover is completed, the handover user sends a handover complete message (Handover Complete), and the handover user starts to use the newly allocated A-port circuit to perform user plane data exchange. In the case of a local exchange of calls, switching between BSCs may result in local exchanges not being applicable.
  • FIG. 5 is a schematic diagram of a call mode transition in a handover process between BSCs according to an embodiment of the present invention. As shown in FIG. 5, after receiving the handover request message (Handover Required), the MSC determines that the handover will result in local handover.
  • the MSC actively initiates a call mode conversion operation.
  • the process of switching users in the conversion process of the call mode is the same as that in the related protocol, and remains unchanged, and details are not described herein again.
  • the MSC After the handover between the BSCs (Handover Complete), the MSC initiates a call mode conversion operation, and sends a local exchange teardown request message to the BSC where the unswitched user (ie, the hold user in the figure) is located, and removes the local exchange link for the unswitched user.
  • FIG. 6 is a schematic diagram of a process of intra-BSC handover in which the AoverIP (ie, AoIP, A port circuit is implemented by IP) is not implemented in the related art.
  • the BSC masters the entire handover procedure without local switching. After receiving the measurement report, the BSC initiates a handover.
  • the BSC After the handover is completed, when the handover user sends a handover, after the completion message (Handover Complete) is sent to the BSC, the BSC sends a Handover Performed message to the MSC for notification.
  • the BSC finds that the intra-BSC handover is required, the BSC must consider whether the local exchange can be continued after the handover. If the BSC finds that the local exchange cannot be maintained after the handover, the local call mode conversion operation shown in FIG. 7 is actively initiated. As shown in FIG. 7, the local call mode conversion operation is the same as the BSC initiatively initiates the conversion operation. BSC does not support A port allocation), so I won't go into details here.
  • FIG. 8 is a schematic diagram of a flow of implementing intra-BSC handover of AoverIP in the related art.
  • the BSC when there is no local exchange, after the BSC receives the measurement report and determines that handover within the BSC is required, the BSC sends an Internal Handover Required message to the MSC, and the MSC returns to the internal handover port.
  • the Internal Handover Command message the BSC starts the channel active (Channel Active), waiting for the switching user to access.
  • the handover user sends a handover complete message (Handover Complete), and the BSC notifies the MSC that the handover is completed.
  • the entire handover process needs to be completed through message interaction between the BSC and the MSC.
  • the BSC In the case of local switching, when a BSC internal handover occurs, the BSC must determine whether the local exchange can still be maintained after the internal handover is completed. If the local exchange cannot be maintained, the local call mode conversion operation shown in FIG. 9 is initiated. As shown in FIG. 9, the BSC may initiate a call mode conversion operation before the handover starts, specifically, the local call mode conversion operation. The same as the above-mentioned BSC initiatively initiates the conversion operation, and details are not described herein again.
  • FIG. 10 is a schematic diagram of a local call mode switching operation in a BSC intra-switching process for implementing AoverIP according to an embodiment of the present invention.
  • the BSC finds that it cannot be maintained after the internal handover.
  • the local exchange carries the local exchange teardown request in the Internal Handover Required message.
  • the MSC After receiving the local exchange teardown request, the MSC allocates the A port circuit to the switcher in the Internal Handover Command. At the same time, the A port resource reassignment message is used to reassign the user plane resource to the non-switching party. After receiving the handover complete message (Handover Complete), the MSC sends a local exchange teardown request notification. After the local exchange is removed, the calling parties exchange user plane data through the newly allocated A-port circuit, which ensures the communication quality of the locally exchanged call users and improves the user experience.
  • a base station controller (BSC) is provided, which is preferably used to implement the functions of the foregoing method embodiment and the base station controller involved in the second embodiment of the apparatus.
  • BSC base station controller
  • 11 is a block diagram of the BSC, as shown in FIG.
  • the BSC includes: a receiving module 1, an establishing module 2, and a removing module 3, wherein: the receiving module 1 is configured to receive a conversion notification message sent by the mobile switching center, where The conversion notification message is used to instruct the base station controller to establish the A port circuit of the two parties of the locally exchanged call; the establishing module 2 is connected to the receiving module 1 for establishing the A port for the locally exchanged calling parties according to the conversion notification message received by the receiving module 1 The circuit module is connected to the establishing module 2, and is configured to remove the locally switched user plane link after the establishing module 2 establishes the A port circuit for the locally exchanged calling parties.
  • the A-port circuit is established on the locally-switched calling party on the base station controller, which overcomes the related art in order to avoid waste of the interface transmission resource and use the local exchange for local calling in the local call that is not applicable to the local exchange.
  • the problem of local call failure improves system performance and enhances user experience.
  • the requesting module 4 is further configured to send a conversion request message to the mobile switching center, where the conversion request message is used to request to tear down the locally switched connection.
  • the establishment module 2 establishes an A-port circuit for the calling parties according to the conversion notification message received by the receiving module 1 for instructing the base station controller to establish the A-port circuit.
  • the embodiment of the present invention makes the local application inapplicable.
  • Local calls exchanged can use non-local exchanges to implement local calls.
  • the BSC further includes: an allocating module 5, which is connectable to the requesting module 4, configured to allocate an A-port circuit to the locally exchanged calling parties, wherein the information of the A-port circuit is carried in the conversion request message sent by the requesting module 4.
  • the BSC supports the A port allocation and actively initiates the call mode switching operation, the A module circuit can be allocated to the calling parties through the distribution module 5.
  • the preferred embodiment is simple to implement and has high operability. For details, refer to the description in the foregoing method embodiments, and details are not described herein again.
  • a Mobile Switching Center (MSC) is provided, which is preferably used to implement the functions of the foregoing method embodiment and the mobile switching center involved in Embodiment 1 of the apparatus, and FIG. 12 is a function of the MSC.
  • the MSC includes: an allocating module 10, a sending module 11, wherein: an allocating module 10, an A port circuit for allocating the locally exchanged calling parties; a sending module 11 connected to the allocating module 10,
  • the conversion notification message is sent to the base station controller, where the conversion notification message carries the information of the A port circuit.
  • the A-port circuit is established on the locally-switched calling party on the base station controller, which overcomes the related art in order to avoid waste of the interface transmission resource and use the local exchange for local calling in the local call that is not applicable to the local exchange.
  • the problem of local call failure improves system performance and enhances user experience.
  • the receiving module 12 is connected to the sending module 11 for receiving a conversion request message sent by the base station controller, where the conversion request message is used to request to tear down the locally switched connection.
  • the receiving module 12 is further configured to receive a conversion complete message sent by the base station controller after the local switched user plane link is removed.
  • the conversion request message carries the allocated A port circuit information, and the distribution module 10 directly according to the receiving module 12
  • the received conversion request message sends a conversion notification message to the base station controller.
  • the preferred embodiment may be converted by a call mode initiated by the MSC, or a call mode initiated by the BSC, and the BSC does not support the A port circuit for the locally exchanged call parties.
  • the MSC allocates the A port circuit for both parties to the local exchange.
  • the sending module 1 sends a conversion notification message for instructing the establishment of the A-port circuit to the BSC, so that the BSC establishes the A-port circuit for the calling parties, so that the calling parties can use the non-local switching mode to implement the local Call, overcoming related techniques in order to avoid
  • the waste of interface transmission resources improves the local call failure caused by the local exchange for local calls in the local call that is not applicable to the local exchange, and improves the user experience of the locally exchanged call parties.
  • the MSC or the BSC allocates and establishes the A port circuit for the calling method, so that the calling parties that are not applicable to the local exchange can use the non-local switching mode to implement the local call, and overcome the related art in order to avoid The waste of interface transmission resources improves the performance and stability of the system by causing local call failures caused by local calls for local calls in local calls that are not applicable locally.
  • the embodiment of the present invention provides an effective technical solution for the switching operation of the call mode. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices.
  • the invention is not limited to any specific combination of hardware and software.
  • the above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.

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  • Computer Networks & Wireless Communication (AREA)
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  • Mobile Radio Communication Systems (AREA)

Description

基站控制器、 移动交换中心及呼叫方式的转换方法 技术领域 本发明涉及通信领域, 具体而言, 涉及一种基站控制器、 移动交换中心 及呼叫方式的转换方法。 背景技术 在现有 的 全球移 动 通信 系 统 ( Global System for Mobile Communications, 简称为 GSM )中, 移动交换中心月艮务器( Mobile Switching Center Server, 简称为 MSC Server ) 和基站控制器 ( Base Station Controller, 简称为 BSC )之间通过 A接口进行通信, 基站( Base Transceiver Station, 简 称为 BTS ) 与 BSC之间通过 Abis接口连接, 移动终端 ( Mobile Station, 简 称为 MS ) 与 BTS通过空中接口 Um接口进行通信。 在 GSM的呼叫流程中,呼叫一方的用户面语音通过 BSC传递给媒体网 关 ( Media Gateway, 简称为 MGW ), 再由 MGW传递给呼叫对端的 BSC。 图 1是相关技术的 MGW、 BSC及 BTS之间的结构示意框图, 如图 1所示, MGW可以与其下属的多个 BSC通信, BSC可以与其下属的多个 BTS通信, 其中, MGW与 BSC之间通过 A口通信。 在实际的 GSM网络中, 存在着大量的本地呼叫 ( local call ), 即, 呼叫 的双方属于同一 BSC, 具体地, 可以是属于同一 BTS , 或者属于同一 BTS 簇(包括互相级联的多个 BTS )下的不同 BTS。 对于这些本地呼叫, 由于呼 叫双方的 BSC 是同一个, 因 jtb , 呼叫双方的用户面语音数据可以直接通过 BSC进行交互, 而无需再经由 MGW。 但是, 在现有的本地呼叫过程中, 呼 叫的双方仍旧需要将用户面语音经由 MGW传输给对方, 这样就会导致不必 要的接口传输资源的浪费。 针对上述接口传输资源的浪费, 在相关技术中, 釆用了本地交换(Local Switch , 简称 LS )的方式, 该本地交换方式能够使本地呼叫不经过 MGW就 可以完成用户面语音的交换。 但是,在实际操作中,并不是所有的本地呼叫都可以釆用本地交换方式, 例如, 当 BSC进行切换操作(包括某些情况下的 BSC内切换和 BSC间切换) 时, 如果呼叫仍旧继续使用本地交换方式, 则将导致呼叫的失败。 其中, 某 些情况可以是 BSC下属的用户新申请了不适用本地交换的增值业务,也可以 是由于 BSC 内切换后的主 /被叫的语音版本不一致。 然而, 4十对相关技术中 在不适用本地交换方式的情况下继续使用本地交换方式而导致呼叫失败的问 题, 目前尚未提出有效的解决方案。 发明内容 针对相关技术中在不适用本地交换的呼叫中使用本地交换进行本地呼 叫而导致的呼叫失败的问题而提出本发明。 为此, 本发明旨在提供一种呼叫 方式的转换方案, 以解决上述问题。 为了实现上述目的, 根据本发明的一方面, 提供了一种呼叫方式的转换 方法。 才艮据本发明的呼叫方式的转换方法包括:移动交换中心发送转换通知消 息; 基站控制器根据其从移动交换中心接收的转换通知消息, 为本地交换的 呼叫双方建立 A口电路。 进一步地, 在移动交换中心发送转换通知消息之前, 上述方法还包括: 移动交换中心预先为呼叫双方分配 A口电路, 转换通知消息中携带移动交换 中心为呼叫双方分配的 A口电路的信息,基站控制器根据信息建立 A口电路。 进一步地, 在移动交换中心发送转换通知消息之前, 上述方法包括: 基 站控制器向移动交换中心发送转换请求消息, 其中, 转换请求消息用于请求 拆除本地交换的连接。 进一步地, 所述移动交换中心预先为所述呼叫双方分配所述 A口电路, 并发送转换通知消息之前, 上述方法还包括: 基站控制器向移动交换中心发 送转换请求消息, 其中, 转换请求消息用于请求拆除本地交换的连接。 进一步地,基站控制器向移动交换中心发送的转换请求消息包括: 基站 控制器向移动交换中心发送转换请求消息, 其中, 所述转换请求消息中携带 基站控制器为呼叫双方分配的 A口电路的信息。 进一步地, 在基站控制器为本地交换的呼叫双方建立 A 口电路之后, 上述方法还包括: 基站控制器拆除本地交换的用户面链路。 进一步地, 转换通知消息中携带 A 口电路的信息包括: 呼叫双方中第 一呼叫方和第二呼叫方各自的标识、 分配给第一呼叫方的 A口电路的信息、 以及分配给第二呼叫方的 A口电路的信息;或者为呼叫双方分配的 A口电路 的信息包括: 分配给一个呼叫方的 A口电路的信息、 和分配给另一个呼叫方 的 A口电路的信息。 为了实现上述目的, 根据本发明的另一方面, 提供了一种基站控制器。 根据本发明的基站控制器包括: 接收模块, 用于接收移动交换中心发送 的转换通知消息, 其中, 转换通知消息用于指示基站控制器建立本地交换的 呼叫双方的 A口电路; 建立模块, 用于根据接收模块接收的转换通知消息为 本地交换的呼叫双方建立 A口电路; 拆除模块, 用于在建立模块为本地交换 的呼叫双方建立 A口电路后, 拆除本地交换的用户面链路。 进一步地, 该基站控制器还包括: 请求模块, 用于向移动交换中心发送 转换请求消息, 其中, 转换请求消息用于请求拆除所述本地交换的连接。 进一步地, 分配模块, 用于为本地交换的呼叫双方分配 A 口电路, 其 中, A口电路的信息携带在请求模块发送的转换请求消息中。 为了实现上述目的,根据本发明的又一方面,提供了一种移动交换中心。 才艮据本发明的移动交换中心包括: 分配模块, 用于为本地交换的呼叫双 方分配的 A口电路; 发送模块, 用于向基站控制器发送转换通知消息, 其中, 转换通知消息中携带所述 A口电路的信息。 进一步地,接收模块,用于接收基站控制器发送的转换请求消息,其中, 所述转换请求消息用于请求拆除所述本地交换的连接。 进一步地,接收模块还用于接收基站控制器拆除本地交换的用户面链路 后发送的转换完成消息。 借助于上述技术方案的至少之一,通过基站控制器根据移动交换中心发 送的转换通知消息, 为呼叫的双方分别建立 A口电路, 克服了上述相关技术 中在不适用本地交换的呼叫中使用本地交换进行本地呼叫而导致的呼叫失败 的问题, 能够通过呼叫方式的转换, 将呼叫转换为非本地交换方式来实现不 适用本地交换的本地呼叫。 附图说明 此处所说明的附图用来提供对本发明的进一步理解,构成本申请的一部 分, 本发明的示意性实施例及其说明用于解释本发明, 并不构成对本发明的 不当限定。 在附图中: 图 1是相关技术的 MGW、 BSC及 BTS之间的结构示意框图; 图 2是才艮据本发明实施例的 MSC主动发起转换操作的呼叫方式的转换 方法流程图; 图 3是才艮据本发明实施例的 BSC主动发起转换操作的呼叫方式的转换 方法流程图; 图 4是相关技术中的 BSC间切换的流程的示意图; 图 5是才艮据本发明实施例的 BSC间的切换过程中的呼叫方式转换的示 意图; 图 6是相关技术中的未实现 AoverIP的 BSC内切换的流程的示意图; 图 7是才艮据本发明实施例的未实现 AoverIP的 BSC内切换过程中的呼 叫方式转换的示意图; 图 8是相关技术中的实现 AoverIP的 BSC内切换的流程的示意图; 图 9是才艮据本发明实施例的实现 AoverIP的 BSC内切换过程中的呼叫 方式转换的示意图; 图 10是才艮据本发明实施例的实现 AoverIP的 BSC内切换过程中的呼叫 方式转换的另一示意图; 图 11是才艮据本发明实施例的 BSC的框图; 图 12是才艮据本发明实施例的 MSC的框图。 具体实施方式 由于在相关技术中通过使用本地交换进行本地呼叫来避免接口传输资 源的浪费, 但是, 如果在不适用本地交换方式的情况下继续使用本地交换方 式就会导致呼叫失败。 此时, 就需要将本地呼叫的呼叫方式从本地交换转换 为非本地交换。 基于此, 本发明实施例提供了一种呼叫方式的转换方案, 即, 通过基站控制器 居移动交换中心发送的转换通知消息, 为本地呼叫的双方 分别建立 A口电路, 然后再拆除本地交换的用户面链路。 这样, 本地呼叫的 双方就可以使用非本地交换来实现本地呼叫, 以进行正常地通信。 下面将参考附图并结合实施例, 来详细说明本发明。 需要说明的是, 如 果不冲突, 本申请中的实施例以及实施例中的特征可以相互组合。 在下文的 描述中, 支设 BSC上已经建立了本地交换, 并且 MSC和 BSC都知晓哪些呼 叫建立了本地交换, 以及哪些呼叫不适用本地交换, 因此, MSC和 BSC都 可以主动发起呼叫方式转换, 从而将某些不适合本地交换方式的呼叫转换为 非本地交换方式。 方法实施例 才艮据本发明实施例, 提供了一种呼叫方式的转换方法, 这里的呼叫方式 包括本地交换和非本地交换, BSC或 BTS上建立了本地交换。 上述呼叫方式的转换方法包括:移动交换中心为本地交换的呼叫双方建 立 A口电路并发送转换通知消息; BSC根据其从移动交换中心接收的转换通 知消息, 为本地交换的呼叫双方建立 A口电路, 其中, 转换通知消息用于指 示 BSC建立 A口电路。 如上所述, 在进行呼叫方式的转换过程中, MSC和 BSC都需要为呼叫 双方建立 A口电路, 其中, BSC根据接收的转换通知消息, 为呼叫双方建立 A口电路, 使得不适用本地交换的呼叫双方可以使用非本地交换进行通信, 克服了相关技术中在不适用本地交换的本地呼叫中使用本地交换进行本地呼 叫而导致的呼叫失败的问题, 使得呼叫双方可以进行正常地通信。 具体地,以下分别以 MSC和 BSC主动发起转换操作为例详细描述该转 换流程。
(一 ) MSC主动发起转换操作
MSC向 BSC发送转换通知消息, 并在转换通知消息中携带 MSC为呼 叫双方分配的 A口电路的信息。 这样, BSC就可以才艮据 MSC为呼叫双方分 配的 A口电路的信息分别为呼叫双方建立 A口电路,实现非本地交换的本地 呼叫。 图 2是才艮据本发明实施例的 MSC主动发起转换操作的呼叫方式的转换 方法流程图, 如图 2所示, 在本地交换建立后的呼叫过程中, MSC主动发起 转换操作, 该呼叫方式的转换方法的流程包括: 首先, MSC为进行转换操作的呼叫双方分别分配 A口电路, 并为呼叫 双方建立 A口电路; 然后, MSC向 BSC发送转换通知消息, 即图 2中的本地交换拆除通知 消息, 在该消息中携带有分别为呼叫双方新分配的 A 口电路信息。 这里的 MSC发送转换通知消息和为呼叫双方建立 A 口电路的操作可以根据实际操 作中的流程来确定先后顺序, 本发明不限于此。 这样, 在 BSC接收到本地交换拆除通知消息后, 根据消息携带的 A口 电路的信息, 就可以为呼叫双方分别建立 A口电路, 即, 分别建立呼叫双方 到 A口的连接。 建立 A口电路完成后, BSC拆除本地交换的用户面链路, 并向 MSC返 回转换完成消息, 即图 2中的本地交换拆除应答消息。 在具体实施过程中, MSC 发送的本地交换拆除通知消息可以有以下两 种形式:
( 1 ) 至少包括如表 1所示的四个字段, 呼叫参考号 1 , 呼叫参考号 2 , A口电路 1 , A口电路 2 , A口电路 1被分配给呼叫参考号 1代表的呼叫方, A口电路 2被分配给呼叫参考号 2代表的呼叫方。 其中, 呼叫参考号是本地 交换建立时为每个呼叫分配的, 这样, 就可以明确的区分哪个 A口电路信息 是分配给呼叫的哪一方的。 表 1
Figure imgf000008_0001
( 2 )至少包括如表 2所示的两个字段,本方 A口电路,对方 A口电路。 其中, 本方 A口电路表示为传输本地交换拆除通知消息的链路对应的呼叫一 方分配的 A口电路, 而对方 A口电路则表示为呼叫的另一方分配的 A口电 路。 表 2
Figure imgf000009_0001
需要说明的是, 在本实施例中的 A口电路信息釆用 TDM格式来表示, 在实际操作中, 也可以用 IP格式或其它格式来表示该 A口电路信息。 该实施例通过 MSC主动发起转换操作, 通知基站控制器中的本地交换 的连接拆除, 重新建立新的 A口电路, 从而将本地交换转换为非本地交换, 避免了在 BSC切换时由于本地交换方式而造成的呼叫失败,提高了系统的性 能。
(二) BSC主动发起转换操作 基站控制器向移动交换中心发送转换请求消息, 其中, 转换请求消息用 于请求发起对呼叫方式的转换; 响应于转换请求消息, 移动交换中心向基站 控制器发送转换通知消息。 具体地, 如果基站控制器支持 A口电路分配, 则基站控制器可以为呼叫 双方分配 A口电路, 此时发送给 MSC的转换请求消息包括基站控制器为呼 叫双方分配的 A口电路的信息。此时,移动交换中心接收到转换请求消息后, 就无需为呼叫双方分配 A口电路, 移动交换中心根据转换请求消息, 为呼叫 双方建立 A口电路。 然后, MSC发送转换通知消息给 BSC, 该转换通知消 息可以携带有转换请求消息中的 A口电路的信息, 也可以不携带该信息。 在 BSC接收到转换通知消息后, BSC就可以为呼叫双方建立 A 口电路, 实现 Y本地交换的本地呼叫。 当然, 如果基站控制器不支持 A口电路分配, 则发送给 MSC的转换请 求消息仅用于请求发起对呼叫方式的转换, 此时, MSC 为呼叫双方分配 A 口电路, 接下来的流程与上述 (一) 中的流程相同, 这里不再赞述。 图 3是才艮据本发明实施例的 BSC主动发起转换操作的呼叫方式的转换 方法流程图, 如图 3所示, 在本地交换建立后的呼叫过程中, BSC主动发起 转换操作, 其中, BSC支持 A口电路分配, 该呼叫方式的转换方法的流程包 括: 首先, BSC向 MSC发送转换请求消息, 即图 3中的本地交换拆除请求 消息。 由于 BSC支持 A口电路分配, 因此, BSC为呼叫双方分别分配 A口 电路, 并将分配的 A 口电路的信息携带在本地交换拆除请求消息中发送给 MSC。 如果 BSC不支持 A口电路分配, 则 BSC无法为呼叫双方分配 A口电 路, 此时, 发送的本地交换拆除请求消息仅用于请求发起对呼叫方式的转换 操作。
MSC接收到本地交换拆除请求消息后, 判断是否需要为本次转换操作 分配 A 口电路。 如果本地交换拆除请求消息中携带了 A 口电路的信息, 则 MSC不需要再分配了, 只需进行确认 A 口电路的信息即可; 如果本地交换 拆除请求消息中没有携带 A 口电路的信息, 即, BSC未分配 A 口电路的信 息, 则 MSC需要为呼叫双方分别分配 A口电路。
MSC根据分配的 A口电路为呼叫双方分别建立 A口电路的连接, 并发 送转换通知消息, 即图中的本地交换拆除通知消息给 BSC。 如果 BSC 未分 配 A口电路, 则在本地交换拆除通知消息中携带分配的 A口电路的信息。如 果 BSC分配了 A 口电路, 则在本地交换拆除通知消息中可以携带、 也可以 不携带分配的 A口电路的信息。
BSC接收到本地交换拆除通知消息后, 为呼叫双方分别建立到 A 口的 连接。 建立完成后, BSC拆除本地交换的用户面链路, 向 MSC返回本地交 换拆除应答消息。 这里的 A口电路的信息可以是上述描述的两种形式, 这里不再赞述。 该实施例通过 BSC主动发起转换操作,通知 MSC下发的转换通知消息, 在 BSC接收到该转换通知消息后, BSC根据转换通知消息中携带的 A口电 路的信息, 为本地交换的呼叫双方的建立 A口电路, 从而将本地交换转换为 非本地交换, 避免了在 BSC切换时由于本地交换方式而造成的呼叫失败, 提 高了系统的性能和稳定性。 以下分别以由 BSC间或 BSC内的切换引起的呼叫方式转换为例, 来详 细说明本发明实施例。
(一) 由 BSC间的切换引起的呼叫方式转换 图 4是相关技术中的 BSC间切换的流程的示意图。 在呼叫不存在本地交换时, 如图 4所示, BSC接收到 MS的测量报告 ( Measurement Report ) 后, 发现需要进行 BSC间切换, 则 BSC向 MSC发 送切换要求 (Handover Required)。 MSC判断该次切换为 BSC间切换, 则向切 换用户的切入 BSC发送切换请求消息( Handover Request ), 并在切换请求消 息中携带为切换用户分配的 A 口电路的信息。 切入 BSC为切换用户在切入 BTS上激活信道 ( Channel Active ), 并等待切换用户接入。 用户接入、 切换 完成后, 切换用户发送切换完成消息 (Handover Complete ), 切换用户开始 使用新分配的 A口电路进行用户面数据交换。 在呼叫存在本地交换的情况下, BSC 间的切换会导致本地交换的不适 用。图 5是才艮据本发明实施例的 BSC间的切换过程中的呼叫方式转换的示意 图, 如图 5所示, MSC在接收到切换要求消息 ( Handover Required )后, 判 断本次切换将导致本地交换无法继续,因此需要将进行呼叫方式的转换操作。 此时, MSC主动发起呼叫方式的转换操作。 在呼叫方式的转换过程中的切换用户的流程与相关协议中的实现相同, 保持不变, 这里不再赘述。 如上所述, 切换后用户会使用分配的 A 口电路, 但未切换用户要在本 地交换后仍然保持呼叫, 则必须获得新分配的电路。 在 BSC 间切换完成 ( Handover Complete )后, MSC发起呼叫方式的转换操作,向未切换用户(即 图中的保持用户)所在的 BSC发送本地交换拆除请求消息, 为未切换用户拆 除本地交换链路后, 未切换用户使用重新建立的 A口电路连接进行用户面数 据交换, 保证了切换用户和未切换用户的通信质量, 提高了用户体验。 (二) 由 BSC内的切换引起的呼叫方式转换 图 6是相关技术中的未实现 AoverIP (即 AoIP, A口电路通过 IP方式 实现) 的 BSC内切换的流程的示意图。 如图 6所示, 在没有本地交换的情况下, BSC掌握整个切换流程。 BSC 在接收到测量报告后, BSC发起切换, 在切换完成后, 当切换用户发送切换 完成消息 (Handover Complete ) 给 BSC 后, BSC 向 MSC 发送切换执行 ( Handover Performed ) 消息进行通知。 在呼叫实现了本地交换的情况下, 而此时根据测量报告, BSC 发现需 要进行 BSC内切换, 则 BSC必须考虑切换后能否继续保持本地交换。 如果 BSC发现切换后不能保持本地交换, 则需要主动发起图 7所示的本地呼叫方 式的转换操作, 如图 7所示, 具体地本地呼叫方式的转换操作与上述 BSC主 动发起转换操作相同 (其中, BSC不支持 A口分配), 这里不再赘述。 这样, 在 BSC切换完成前, 呼叫已经从本地交换转换到非本地交换。 图 8是相关技术中的实现 AoverIP的 BSC内切换的流程的示意图。 如 图 8所示, 在没有本地交换的情况下, BSC接收到测量报告后, 判断需要进 行 BSC内的切换,则 BSC向 MSC发送内部切换要求消息( Internal Handover Required ), MSC返回内部切换通 口消息( Internal Handover Command )消息, BSC开始激活信道 ( Channel Active ), 等待切换用户接入。 在用户接入切换 完成后, 切换用户发送切换完成消息 ( Handover Complete ), BSC通知 MSC 切换完成。 整个切换流程需要通过 BSC与 MSC之间的消息交互完成。 在有本地交换的情况下, 当发生 BSC内部切换时, BSC必须判断在内 部切换完成后, 是否依然能保持本地交换。 如果不能保持本地交换, 则需要 主动发起图 9所示的本地呼叫方式的转换操作, 如图 9所示, BSC可以在切 换开始之前发起呼叫方式的转换操作, 具体地该本地呼叫方式的转换操作与 上述 BSC主动发起转换操作相同, 这里不再赘述。 此时, BSC 内部切换流 程不需要爹改, 内部切换完成前, 本地交换已转换为非本地交换。 在具体实施过程中, 还可以选择对 BSC 内部切换流程作一定 4爹改, 来 实现本地交换到非本地交换的转换。 图 10 是 居本发明实施例的实现 AoverIP的 BSC内切换过程中的本地呼叫方式的转换操作的示意图,如图 10 所示, BSC在接收到测量 4艮告后, 发现无法在内部切换后保持本地交换, 则 在内部切换要求消息( Internal Handover Required )中携带本地交换拆除请求, MSC接收到该本地交换拆除请求后,在内部切换通知消息( Internal Handover Command ) 中为切换方分配 A 口电路, 同时使用 A 口资源重新分配消息为 未切换方重新分配用户面资源。在接收到切换完成消息( Handover Complete ) 后, MSC发送本地交换拆除请求通知。 在本地交换拆除后, 呼叫双方通过新 分配 A口电路进行用户面数据交换, 保证了本地交换的呼叫双方用户的通信 质量, 提高了用户体验。 装置实施例一 根据本发明实施例, 提供了一种基站控制器 (BSC ), 优选地该用于实 现上述方法实施例以及下述装置实施例二中涉及的基站控制器的功能。 图 11 是该 BSC的框图, 如图 11所示, 该 BSC包括: 接收模块 1、 建立模块 2、 拆除模块 3 , 其中: 接收模块 1 , 用于接收移动交换中心发送的转换通知消息, 其中, 转换 通知消息用于指示基站控制器建立本地交换的呼叫双方的 A口电路; 建立模 块 2 , 连接至接收模块 1 , 用于根据接收模块 1接收的转换通知消息为本地 交换的呼叫双方建立 A口电路; 拆除模块 3 , 连接至建立模块 2 , 用于在建 立模块 2为本地交换的呼叫双方建立 A口电路后, 拆除本地交换的用户面链 路。 本实施例通过对基站控制器上的本地交换的呼叫双方建立 A 口电路, 克服了相关技术中为了避免接口传输资源的浪费在不适用本地交换的本地呼 叫中使用本地交换进行本地呼叫而导致的本地呼叫失败的问题, 提高了系统 的性能, 增强了用户体验。 优选地, 在 BSC主动发起呼叫方式的转换操作时, 请求模块 4 , 还用 于向移动交换中心发送转换请求消息, 其中, 转换请求消息用于请求拆除本 地交换的连接。 如上所述,通过建立模块 2根据接收模块 1接收的用于指示基站控制器 建立 A口电路的转换通知消息为呼叫双方建立 A口电路, 相比与相关技术, 本发明实施例使得不适用本地交换的本地呼叫可以使用非本地交换来实现本 地呼叫。 优选地, 该 BSC还包括: 分配模块 5 , 可以连接至请求模块 4 , 用于为 本地交换的呼叫双方分配 A口电路, 其中, A口电路的信息携带在请求模块 4发送的转换请求消息中, 这样, 在 BSC支持 A口分配、 且在主动发起呼叫 方式的转换操作时, 就可以通过分配模块 5为呼叫双方分配 A口电路。 该优 选实施例实现简单, 可操作性强。 具体地各模块的操作可以参考上述方法实施例中的描述, 这里不再赘 述。 装置实施例二 根据本发明实施例, 提供了一种移动交换中心 (MSC ), 优选地用于实 现上述方法实施例以及装置实施例一中涉及的移动交换中心的功能, 图 12 是该 MSC的框图, 如图 12所示, 该 MSC包括: 分配模块 10 , 发送模块 11 , 其中: 分配模块 10, 用于为本地交换的呼叫双方分配的 A口电路; 发送模块 11 , 连接至分配模块 10 , 用于在判断需要进行呼叫方式转换时, 向基站控制 器发送转换通知消息, 其中, 转换通知消息中携带 A口电路的信息。 本实施例通过对基站控制器上的本地交换的呼叫双方建立 A 口电路, 克服了相关技术中为了避免接口传输资源的浪费在不适用本地交换的本地呼 叫中使用本地交换进行本地呼叫而导致的本地呼叫失败的问题, 提高了系统 的性能, 增强了用户体验。 优选地, 接收模块 12, 连接至发送模块 11 , 用于接收基站控制器发送 的转换请求消息, 其中, 所述转换请求消息用于请求拆除所述本地交换的连 接。 此外, 接收模块 12 还可以用于接收基站控制器拆除本地交换的用户面 链路后发送的转换完成消息。 在由 BSC主动发起的呼叫方式的转换、且 BSC支持为本地交换的呼叫 双方分配 A口电路的情况下, 转换请求消息中携带有分配的 A口电路信息, 该分配模块 10直接根据接收模块 12接收的转换请求消息向基站控制器发送 转换通知消息。 另夕卜, 在具体实施过程中, 本优选实施例可以由 MSC主动发起的呼叫 方式的转换、 或由 BSC主动发起的呼叫方式的转换、 且 BSC不支持为本地 交换的呼叫双方分配 A口电路的情况下, MSC为本地交换的呼叫双方分配 A 口电路。 具体地各模块的操作可以参考上述方法实施例中的描述, 这里不再赘 述。 由以上描述可以看出, 通过发送模块 1向 BSC发送用于指示建立 A口 电路的转换通知消息, 使得 BSC为呼叫双方建立 A 口电路, 这样, 呼叫双 方就可以使用非本地交换方式来实现本地呼叫, 克服了相关技术中为了避免 接口传输资源的浪费在不适用本地交换的本地呼叫中使用本地交换进行本地 呼叫而导致的本地呼叫失败的问题,提高了本地交换的呼叫双方的用户体验。 综上所述, 通过本发明实施例, MSC或 BSC为呼叫方法分配并建立 A 口电路, 使得不适用本地交换的呼叫双方可以使用非本地交换方式来实现本 地呼叫, 克服了相关技术中为了避免接口传输资源的浪费在不适用本地交换 的本地呼叫中使用本地交换进行本地呼叫而导致的本地呼叫失败的问题, 提 高了系统的性能和稳定性。 另外, 本发明实施例为呼叫方式的转换操作提供 了有效的技术方案。 显然, 本领域的技术人员应该明白, 上述的本发明的各模块或各步骤可 以用通用的计算装置来实现, 它们可以集中在单个的计算装置上, 或者分布 在多个计算装置所组成的网络上, 可选地, 它们可以用计算装置可执行的程 序代码来实现, 从而, 可以将它们存储在存储装置中由计算装置来执行, 或 者将它们分别制作成各个集成电路模块, 或者将它们中的多个模块或步骤制 作成单个集成电路模块来实现。 这样, 本发明不限制于任何特定的硬件和软 件结合。 以上所述仅为本发明的优选实施例而已, 并不用于限制本发明, 对于本 领域的技术人员来说, 本发明可以有各种更改和变化。 凡在本发明的 ^"神和 原则之内, 所作的任何修改、 等同替换、 改进等, 均应包含在本发明的保护 范围之内。

Claims

权 利 要 求 书
1. 一种呼叫方式的转换方法, 其特征在于, 所述方法包括:
移动交换中心为本地交换的呼叫双方建立 A 口电路并发送转换通 知消息;
基站控制器根据其从所述移动交换中心接收的转换通知消息,为所 述本地交换的呼叫双方建立 A口电路。
2. 根据权利要求 1所述的方法, 其特征在于, 移动交换中心发送转换通知 消息之前, 所述方法还包括:
所述移动交换中心预先为所述呼叫双方分配所述 A 口电路, 所述 转换通知消息中携带所述 A口电路的信息, 所述基站控制器根据所述信 息建立所述 A口电路。
3. 根据权利要求 2所述的方法, 其特征在于, 在所述移动交换中心发送转 换通知消息之前, 所述方法还包括:
所述基站控制器向所述移动交换中心发送转换请求消息, 其中, 所 述转换请求消息用于请求拆除所述本地交换的连接。
4. 根据权利要求 1所述的方法, 其特征在于, 在所述移动交换中心发送转 换通知消息之前, 所述方法还包括:
所述基站控制器向所述移动交换中心发送转换请求消息, 其中, 所 述转换请求消息用于请求拆除所述本地交换的连接。
5. 根据权利要求 4所述的方法, 其特征在于, 所述基站控制器向所述移动 交换中心发送的所述转换请求消息包括: 所述基站控制器向所述移动交 换中心发送所述转换请求消息, 其中, 所述转换请求消息中携带所述基 站控制器为所述呼叫双方分配的所述 A口电路的信息。
6. 根据权利要求 1至 5中任一项所述的方法, 其特征在于, 在所述基站控 制器为所述本地交换的呼叫双方建立所述 A口电路之后, 所述方法还包 括:
所述基站控制器拆除所述本地交换的用户面链路。
7. 根据权利要求 2至 5中任一项所述的方法, 其特征在于, 所述转换通知 消息中携带所述 A口电路的信息包括:
所述呼叫双方中第一呼叫方和第二呼叫方各自的标识、分配给所述 第一呼叫方的 A口电路的信息、以及分配给所述第二呼叫方的 A口电路 的信息; 或者
分配给一个呼叫方的 A口电路的信息、和分配给另一个呼叫方的 A 口电路的信息。
8. —种基站控制器, 其特征在于, 所述基站控制器包括:
接收模块, 用于接收移动交换中心发送的转换通知消息, 其中, 所 述转换通知消息用于指示所述基站控制器建立本地交换的呼叫双方的 A 口电路;
建立模块,用于根据所述接收模块接收的所述转换通知消息为所述 本地交换的呼叫双方建立所述 A口电路;
拆除模块,用于在所述建立模块为所述本地交换的呼叫双方建立所 述 A口电路后, 拆除所述本地交换的用户面链路。
9. 根据权利要求 8所述的基站控制器, 其特征在于, 所述基站控制器还包 括:
请求模块, 用于向所述移动交换中心发送转换请求消息, 其中, 所 述转换请求消息用于请求拆除所述本地交换的连接。
10. 根据权利要求 9所述的基站控制器, 其特征在于, 所述基站控制器还包 括:
分配模块, 用于为所述本地交换的呼叫双方分配所述 A 口电路, 其中, 所述 A口电路的信息携带在所述请求模块发送的所述转换请求消 息中。
11. 一种移动交换中心, 其特征在于, 所述移动交换中心包括:
分配模块, 用于为本地交换的呼叫双方分配的 A口电路; 发送模块, 用于向基站控制器发送转换通知消息, 其中, 所述转换 通知消息中携带所述 A口电路的信息。
12. 根据权利要求 11所述的移动交换中心, 其特征在于, 所述移动交换中心 还包括:
接收模块, 用于接收所述基站控制器发送的转换请求消息, 其中, 所述转换请求消息用于请求拆除所述本地交换的连接。 才艮据权利要求 12所述的移动交换中心, 其特征在于, 所述接收模块还用 于接收所述基站控制器拆除所述本地交换的用户面链路后发送的转换完 成消息。
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