WO2009059477A1 - A method for realizing voice coding/decoding capability interaction between a radio network and a core network - Google Patents

A method for realizing voice coding/decoding capability interaction between a radio network and a core network Download PDF

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Publication number
WO2009059477A1
WO2009059477A1 PCT/CN2007/003939 CN2007003939W WO2009059477A1 WO 2009059477 A1 WO2009059477 A1 WO 2009059477A1 CN 2007003939 W CN2007003939 W CN 2007003939W WO 2009059477 A1 WO2009059477 A1 WO 2009059477A1
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Prior art keywords
cell
base station
capability
voice
request message
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English (en)
French (fr)
Inventor
Xinhui Wamg
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ZTE Corp
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ZTE Corp
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Priority to HK10107495.3A priority Critical patent/HK1141187B/zh
Priority to CN2007801011336A priority patent/CN101828423B/zh
Publication of WO2009059477A1 publication Critical patent/WO2009059477A1/zh
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/18Service support devices; Network management devices
    • H04W88/181Transcoding devices; Rate adaptation devices
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10LSPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/04Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
    • G10L19/16Vocoder architecture
    • G10L19/18Vocoders using multiple modes
    • G10L19/22Mode decision, i.e. based on audio signal content versus external parameters
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W28/00Network traffic management; Network resource management
    • H04W28/16Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18Negotiating wireless communication parameters
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W92/00Interfaces specially adapted for wireless communication networks
    • H04W92/04Interfaces between hierarchically different network devices
    • H04W92/14Interfaces between hierarchically different network devices between access point controllers and backbone network device

Definitions

  • the present invention relates to mobile communication or specifically, and relates to a method for implementing interaction between a voice codec capability of a wireless network and a core network. Background technique
  • GSM Global System for Mobile Communications
  • MS Mobile Switching Center
  • BSC Base Station Controller
  • the A interface is used for communication.
  • the A interface is carried based on Time Division Multiple (TDM).
  • TDM Time Division Multiple
  • PCM Pulse Code Modulation
  • PCM Pulse Code Modulation
  • the compressed voice coded signal is transmitted.
  • the interface between the BTS and the BSC is an Abis interface, which is also based on TDM bearer, and transmits the same compressed speech coded signal as the Um interface.
  • the BSC has a Transcode Rate Adaption Unit (TRAU), and the unit that implements this function is a Transcoder (Transcoder, referred to as TC).
  • T Transcoder
  • the TC completes the compressed voice transmitted in the Abis interface. Coding with 64Kbps PCM speech coding transmitted in the A interface.
  • the core network realizes the separation of control and bearer, and the MSC is decomposed into two functional entities, namely: Mobile Switching Center Server (Mobile Switching Center Server) MSC Server) and Media Gateway (MGW).
  • the MSC Server is mainly used to control the signaling and the call, and the MGW mainly provides the service bearer.
  • the MGW can serve as a termination point to process the data stream of the bearer channel or the packet network from the circuit switched network.
  • the MGW supports media conversion, bearer control, and load handling, such as codec, echo suppression, conference bridging, and so on.
  • the interface between the MSC Server and the MGW is the Mc interface, and the MSC Server completes the control of the MGW through the Mc interface.
  • the A interface is gradually based on IP bearers, ie A Interface Over IP, referred to as AoIP.
  • the GSM communication network includes: a mobile terminal 60, a base station 50, a base station controller 20, a media gateway 30, a mobile switching center server 10, and a mobile terminal 60 and a base station 50.
  • the MGW itself has a pattern conversion and rate adaptation function
  • the TRAU function in the BSC can be cancelled, that is, the TC in the BSC is cancelled, and the same compressed speech codec signal as the Abis interface is also transmitted on the A interface, when needed.
  • the codec conversion and rate adaptation functions of the MGW are used for speech codec. This architecture greatly reduces the requirements for the transmission resources of the A interface, which is beneficial to operators to reduce operating expenses.
  • the MGW needs to insert the TC for code conversion and rate adaptation when processing the call, which is still not solved compared with the original GSM network system.
  • Trfo Transcoder Free Operation
  • the technical problem to be solved by the present invention is to provide a method for realizing the interaction between the voice codec capability of the wireless network and the core network, which enables the MSC Server to learn the voice codec capability of the cell in the wireless network, thereby reducing the core network to the wireless network. It is possible to assign a voice version that it cannot provide.
  • a method for implementing interaction between a wireless network and a core network voice codec capability includes the following steps: The mobile switching center server sends a ⁇ voice codec capability request message to the base station controller; After receiving the message encoding and decoding capability request message, the base station controller acquires the voice codec capability of the corresponding cell, and reports the acquired voice codec capability of the corresponding cell to the mobile switching center server. Further, the upper voice coding and decoding capability request message uses a resource request message in the base station subsystem application part message.
  • the Spare field of the cell identifier cell of the resource request message is used for identification; when the mobile switching center server requests the base station controller to report it.
  • the cell identifier field of the Spare field and the cell identifier cell is used to identify the cell that needs to be voice codec.
  • the identifier 1 when the identifier 1 is in the Spare field, it indicates that the mobile switching center server requires the base station controller to report the voice codec capability of all the cells it manages; when the 0 is identified in the Spare field, the mobile switching center server requests the base station controller to request The cell identifier field of the cell identifier cell is queried for the cell that needs to report the voice codec capability.
  • the base station controller reports the acquired voice codec capability of the corresponding cell to the mobile switching center server by using the resource indication message in the base station subsystem application part message.
  • a codec list cell of a base station subsystem is extended in the resource indication message, and information of the voice codec capability of the one or more cells is carried in the preferred codec list cell of the base station subsystem.
  • the resource indication message is multiple, and the specific number of the resource indication message is identified in the report voice codec capability request message.
  • the process of acquiring the voice codec capability of the corresponding cell includes: the base station controller parses the received voice message encoding and decoding capability request message, and performs voice coding on the cell that needs to report the voice codec capability according to the analysis result. Query of decoding capabilities.
  • the resource request further includes: a resource indication mode cell and a periodic cell, and the resource indication mode cell and the periodic cell respectively identify the reporting manner and frequency when the base station controller reports the cell codec capability.
  • the voice coding and decoding capability of a wireless network and a core network of the present invention interacts with each other.
  • the BSC reports the voice codec capability of the cell managed by the BSC to the MSC Server, so that the MSC Server can analyze and compare the received voice codec capability of the wireless cell with the voice codec capability of the MGW, and pass the decision algorithm.
  • the MSC Server can analyze and compare the received voice codec capability of the wireless cell with the voice codec capability of the MGW, and pass the decision algorithm.
  • the present invention does not require changes to the existing Um interface and Abis interface, and has no impact on the mobile terminals and base stations of the existing communication network.
  • FIG. 1 is a schematic diagram of a network structure of a GSM communication system to which the present invention is applied in the case of AoIP;
  • FIG. 2 is a flowchart of the method of the present invention;
  • FIG. 3 is a schematic structural diagram of an extended resource request message according to the present invention.
  • FIG. 4 is a schematic structural diagram of a cell identifier cell in an extended resource request message according to the present invention
  • FIG. 5 is a schematic structural diagram of an extended resource indication message according to the present invention
  • FIG. 6 is a schematic structural diagram of a preferred codec table cell of a base station subsystem in an extended resource indication message according to the present invention.
  • the BSC after receiving the report voice codec capability request message sent by the MSC Server, the BSC queries the voice codec capability of the corresponding cell according to the request of the voice codec request message, and queries and decodes the voice codec of the corresponding cell. The capability is reported to the MSC Server.
  • BSSAP base station system application part
  • Step 20 The MSC Server 10 sends a Captain Speech Codec Request message to the BSC 20.
  • the MSC Server 10 sends the BSC to the BSC through the A interface.
  • the voice codec capability request message is reported, and the voice coding and decoding capability of the cell is required to be reported;
  • the above-mentioned reported voice codec capability request message is a resource request message in the base station subsystem application part message.
  • the resource request message includes a cell identifier (Cell Identifier) cell, where the cell identifier cell is used.
  • the description information of a cell is provided.
  • the Cell Identifier cell is extended, and the spare field Spare in the Cell Identifier cell is utilized, and the BSC20 is notified by marking in the Spare field.
  • a cell that reports a voice codec capability such as a flag 1 in the Spare field, may indicate that the BSC 20 is required to report the voice codec capability of all cells it manages. For example, if the identifier 0 is in the Spare field, the BSC 20 is required to request the cell identifier cell.
  • a cell that needs to report voice codec capability is parsed in the cell identifier field.
  • the MSC Server 10 requires the BSC 20 to report the voice codec capability of all the cells managed by the BSC 20, so the Spare field identifier is 1.
  • the Spare field is identified as 0, and the cell identifier of the cell that needs to report the voice codec capability is written into the cell identifier. In the field.
  • the resource request message further includes: a resource indication method (Cell Indication Method), a cell (Lifement) cell, and an extended resource indicator (Extended Resource Indicator) cell, and the resource indication mode cell and the periodic cell are respectively used.
  • the resource indication mode field is set to 1 to indicate that the BSC 20 is to report a single report, that is, the BSC 20 only needs to report once, and the resource indication mode field is set to 0 to indicate that the method is used.
  • the periodic mode is reported, and the period of reporting is defined in the periodic cell.
  • the extended resource indicator is used to define the number of reported messages when the BSC 20 reports the cell voice codec capability. Because the BSC 20 may have many cells, the BSC 20 may be required to report the voice coding and decoding capability of the cell each time. The number of messages used by the BSC 20 is defined in the extended resource indicator cell.
  • Step 202 After receiving the message encoding and decoding capability request message, the BSC 20 parses the reported voice codec capability request message, and requests the voice coding and decoding capability according to the analysis result. The voice coding and decoding capabilities of the cell are queried;
  • the BSC 20 receives the resource request message sent by the MSC Server 10 through the A interface, that is, the resource request message. After receiving the resource request message, the BSC 20 parses the resource request message. When the identifier of the Spare field is 1 is determined, the voice codec capability of all the cells managed by the BSC 20 is queried.
  • the MSC Server 10 If the MSC Server 10 only requests the BSC 20 to report the voice codec capability of a certain cell or a certain cell, that is, the BSC 20 parses the identifier of the Spare field to 0, the BSC 20 continues to parse the cell identity field, and parses the write cell identity field therefrom. The cell identifier, and query the voice codec capability of the cell represented by the parsed cell identifier.
  • Step 203 The BSC 20 sends the queried voice codec capability of the queried cell to the MSC.
  • the BSC 20 sends the voice codec of all the queried cells to the MSC Server 10 through the resource indication message in the base station subsystem application part message, because the resource indication message can only report the voice codec of one cell at a time.
  • the resource indication message is extended. As shown in FIG. 5, a BSS Preferred Codec List cell is added to the RESOURCE INDICATION message. The cell reports voice coding and decoding capabilities of multiple cells.
  • the present invention The voice codec capability of all cells managed by the BSC 20 is reported by means of multiple RESOURCE INDICATION messages.
  • the number of resource indication messages actually used by the BSC 20 is parsed from the resource indicator cells of the resource request message.
  • the BSS Preferred Codec List cell includes: a Total Number of Segment field, which is used to indicate the number of all RESOURCE INDICATION messages, and the total number of resource request messages in the field. The value is the same as the value identified by the BSC 20 from the resource indicator cell of the resource request message; the current resource request message sequence number (Num of Segment) field is used to identify the sequence number of the current RESOURCE INDICATION message in all RESOURCE INDICATION messages, thereby Notify MSC ServerlO Whether there is a resource indication message that needs to be received; a current resource request message length (Length) field, which is used to indicate the length of the current RESOURCE INDICATION message; and codec capability information of m cells included in each RESOURCE INDICATION message, m Can be set as a parameter, such as m can be set to 32 and so on.
  • a Total Number of Segment field which is used to indicate the number of all RESOURCE INDICATION messages, and the total number of resource
  • the MSC Server 10 can complete the voice codec of the received cell through the control signaling of the Mc interface and the voice codec of the MGW.
  • Ability to do analysis and comparison take out the speech codec type of the common language; select a common speech codec type through the decision algorithm, and notify the BSC20 and other steps, thereby reducing the occurrence of the voice version that the core network cannot provide the voice network, thereby The number of speech codecs is reduced, which is beneficial to implement Trfo and improve voice quality.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Description

一种无线网与核心网间语音编解码能力交互的实现方法
技术领域
本发明涉及移动通信领 i或,具体涉及一种无线网与核心网间语音编解码 能力交互的实现方法。 背景技术
在现有的全球移动通讯系统 ( Global System for Mobile Communications, 筒称: GSM ) 中, 移动交换中心 (Mobile Switching Center, 筒称: MSC ) 和基站控制器 (Base Station Controller, 简称: BSC )之间采用 A接口进行 通讯, A接口是基于时分多路复用 (Time Division Multiple, 简称: TDM ) 进行承载的, 在其上传输的是 64Kbps 的脉冲编码调制 (Pulse Code Modulation, 简称: PCM )语音编码信号。 在移动终端 ( Mobile Station, 简 称: MS ) 与基站(Base Station, 简称: BTS ) 间的空中接口 Um接口上, 传输的是压缩语音编码信号。 BTS与 BSC间的接口为 Abis接口, 该接口也 是基于 TDM承载的,在其上传输的是与 Um接口相同的压缩语音编码信号。 其中, BSC具有码型变换和速率适配功能 ( Transcode Rate Adaption Unit, 简称: TRAU ) , 实现此功能的单元为编解码单元(Transcoder, 简称: TC ) , 由 TC完成 Abis接口中传输的压缩语音编码与 A接口中传输的 64Kbps的 PCM语音编码的转换。
随着第三代移动通讯系统的发展, 在 3GPP release 4后, 核心网实现了 控制和承载的分离, MSC分解成两个功能实体, 即: 移动交换中心服务器 ( Mobile Switching Center Server, 筒称: MSC Server )和媒体网关 (Media Gateway, 简称: MGW ) 。 其中, MSC Server主要用来完成对信令和呼叫 的控制, MGW则主要提供业务承载, MGW可以作为终结点处理来自电路 交换网的承载信道或分组网的数据流。 MGW支持媒体转换、 承载控制和负 荷处理, 如进行编解码、 回声抑制, 会议桥接等。 MSC Server和 MGW之 间的接口为 Mc接口, MSC Server通过 Mc接口完成对 MGW的控制。
随着 IP技术在移动通讯网中的应用, A接口逐步采用基于 IP承载, 即 A Interface Over IP, 简称: AoIP。 如图 1所示, 在 A接口基于 IP承载的情 况下, GSM通信网络包括: 移动终端 60、 基站 50、 基站控制器 20、 媒体网 关 30、移动交换中心服务器 10以及移动终端 60与基站 50之间的 Um接口、 基站 50与基站控制器 20之间的 Abis接口、 基站控制器 20与媒体网关 30、 移动交换中心服务器 10之间的 A接口、 移动交换中心服务器 10和媒体网 关 30之间的 Mc接口。 由于 MGW本身具有码型变换和速率适配功能, 因 此就可以取消 BSC中的 TRAU功能, 即取消 BSC中的 TC, 在 A接口也传 输与 Abis接口相同的压缩语音编解码信号, 当需要时则利用 MGW的码型 变换和速率适配功能来进行语音编解码。这种构架大大减少了对 A接口传输 资源的要求, 有利于运营商降低运营费用。
在这种构架下, 如果核心网指配了无线网不能提供的语音版本, MGW 在处理呼叫时, 就要插入 TC进行码型变换和速率适配, 与原 GSM网络系 统相比, 依然没有解决浪费 TC资源的问题, 且不能在呼叫中建立无码型变 换和速率适配操作 ( Transcoder Free Operation, 筒称: Trfo ) 。 因此, 如果 要减少语音编解码操作就需要核心网和无线网之间在呼叫建立前进行语音 编解码功能的协商,以减少核心网向无线网指配其不能提供的语音版本的情 况的发生, 显然, 为实现上述功能就需要无线网将其语音编解码能力上报给 核心网。 发明内容
本发明要解决的技术问题是提供一种无线网与核心网间语音编解码能 力交互的实现方法, 能够使 MSC Server获悉无线网中的小区的语音编解码 能力,从而为减少核心网向无线网指配其不能提供的语音版本的情况提供了 可能。
为解决上述技术问题,本发明的一种无线网与核心网间语音编解码能 力交互的实现方法, 包括以下步骤: 移动交换中心服务器向基站控制器发 送上^ =艮语音编解码能力请求消息;基站控制器接收到上报语音编解码能力请 求消息后,获取相应小区的语音编解码能力, 并将获取到的相应小区的语音 编解码能力上报给移动交换中心服务器。 进一步地,上才艮语音编解码能力请求消息采用基站子系统应用部分消息 中的资源请求消息。
进一步地,当移动交换中心服务器要求基站控制器上报其管理的全部小 区的语音编解码能力时, 使用资源请求消息的小区标识符信元的 Spare字段 进行标识;当移动交换中心服务器要求基站控制器上报其管理的部分小区的 语音编解码能力时, 使用 Spare字段和小区标识符信元的小区标识字段标识 出需上^ =艮语音编解码能力的小区。
进一步地, 在 Spare字段中标识 1时, 表示移动交换中心服务器要求基 站控制器上报其管理的所有小区的语音编解码能力; 在 Spare字段中标识 0 时,表示移动交换中心服务器要求基站控制器从小区标识符信元的小区标识 字段中查询需上报语音编解码能力的小区。
进一步地,基站控制器通过采用基站子系统应用部分消息中的资源指示 消息将获取到的相应小区的语音编解码能力上报给移动交换中心服务器。
进一步地, 在资源指示消息中扩展一基站子系统优选的编解码列表信 元,在该基站子系统优选的编解码列表信元中携带有一个或多个小区的语音 编解码能力的信息。
进一步地, 资源指示消息为多条, 且, 资源指示消息的具体条数在上报 语音编解码能力请求消息中进行标识。
进一步地,上^ =艮语音编解码能力奇求消息采用基站子系统应用部分消息 中的资源请求消息,资源指示消息的具体条数在资源请求消息的资源指示器 信元中进行标识。
进一步地, 获取相应小区的语音编解码能力的过程包括: 基站控制器对 接收到的上^ =艮语音编解码能力请求消息进行解析,根据解析结果对需要上报 语音编解码能力的小区进行语音编解码能力的查询。
进一步地, 资源请求还包括: 资源指示方式信元和周期信元, 资源指示 方式信元和周期信元分别对基站控制器上报小区编解码能力时的上报方式 和频度进行标识。
综上所述,在本发明的一种无线网与核心网间语音编解码能力交互的实 现方法中, BSC将其管理的小区的语音编解码能力上报给 MSC Server, 从 而可使 MSC Server将收到的无线小区的语音编解码能力与 MGW的语音编 解码能力进行分析比较, 通过判决算法来选取分析出的公共语音编解码类 型, 为减少核心网向无线网指配其不能提供的语音版本的发生提供了可能, 为实现 Trfo创造了条件。 本发明不要求改变现有的 Um接口和 Abis接口, 对现有通信网络的移动终端和基站没有任何影响。 附图概述
下面结合附图和具体实施例进一步对本发明进行详细说明;
图 1是本发明应用的 GSM通讯系统在 AoIP情况下的网络结构示意图; 图 2是本发明方法的流程图;
图 3是本发明扩展的资源请求消息的结构示意图;
图 4是本发明扩展的资源请求消息中的小区标识符信元的结构示意图; 图 5是本发明扩展的资源指示消息妁结构示意图;
图 6是本发明扩展的资源指示消息中的基站子系统优选的编解码表信 元的结构示意图。
本发明的较佳实施方式
本发明中, BSC在接收到 MSC Server发送的上报语音编解码能力请求 消息后,根据语音编解码请求消息的要求,查询相应小区的语音编解码能力, 并将查询到的相应小区的语音编解码能力上报给 MSC Server。
并进一步采用对现有 1"办议中的两条基站子系统应用部分(Base Station System Application Part, 筒称: BSSAP )消息, 即资源请求消息( RESOURCE REQUEST )和资源指示消息(RESOURCE INDICATION ) , 进行扩展, 通 过扩展这两条消息中相关的字段来完成基站子系统(Base Station System, 筒称: BSS )对其下的 BSC所管理的小区的语音编解码能力的上报。
以下结合附图对本发明的具体实施方式进行祥细说明: 如图 2所示, 为本发明方法的流程图, 该方法包括如下步骤: 步骤 20 MSC Server 10向 BSC20发送上艮语音编解码能力请求消息; 本实施例中, MSC ServerlO通过 A接口向 BSC20发送上报语音编解码 能力请求消息, 要求其上报小区的语音编解码能力;
上述上报语音编解码能力请求消息为基站子系统应用部分消息中的资 源请求消息, 如图 3所示, 在该资源请求消息中包含小区标识符 (Cell Identifier )信元, 该小区标识符信元用于提供一个小区的描述信息, 如图 4 所示, 在本发明中, 对 Cell Identifier信元进行 展, 对 Cell Identifier信元 中的备用字段 Spare进行利用,通过在 Spare字段中进行标识来通知 BSC20 要上报语音编鮮码能力的小区,如在 Spare字段中标识 1,可表示要求 BSC20 上报其管理的所有小区的语音编解码能力, 如在 Spare字段中标识 0, 则表 示要求 BSC20从小区标识符信元的小区标识字段中解析出需要上报语音编 解码能力的小区。
在本实施例中 MSC ServerlO要求 BSC20上报该其下管理的所有小区的 语音编解码能力, 所以 Spare字段标识为 1。 当 MSC ServerlO仅需要 BSC20 上^ =艮某一个或某几个小区的语音编解码能力时, 则将 Spare字段标识为 0, 并将需要上报语音编解码能力的小区的小区标识符写入小区标识字段中。
在资源请求消息中还包含: 资源指示方式( Resource Indication Method ) 信元、 周期 ( Periodicity )信元和扩展的资源指示器 ( Extended Resource Indicator )信元, 资源指示方式信元和周期信元分别用于指示 BSC20上报小 区编解码能力时的上报方式和频度, 如, 可将资源指示方式字段设置为 1表 示采用单次上报, 即 BSC20仅需上报一次, 将资源指示方式字段设置为 0 表示采用周期方式上报, 并在周期信元中定义上报的周期。扩展的资源指示 器用于定义 BSC20上报小区语音编解码能力时上报消息的条数,因为, BSC 20所管理的小区可能有很多, 所以可以要求 BSC20每次使用多条消息上报 小区的语音编解码能力, BSC20所使用的消息的条数就定义在扩展的资源指 示器信元中。
步骤 202: BSC 20接收到上^!语音编解码能力请求消息后,对该上报语 音编解码能力请求消息进行解析,根据解析结果对要求上报语音编解码能力 的小区的语音编解码能力进行查询;
本实施例中 , BSC20通过 A接口接收 MSC Server 10发送的资源请求消 息, 即资源请求消息。 BSC20在接收到资源请求消息后对该资源请求消息进 行解析, 当解析出 Spare字段的标识为 1时, 对其下管理的所有小区的语音 编解码能力进行查询。
如果 MSC Server 10仅要求 BSC20上报某一个或某几个小区的语音编解 码能力, 即 BSC20解析出 Spare字段的标识为 0, 则 BSC20继续对小区标 识字段进行解析,从中解析出写入小区标识字段的小区标识, 并对解析出的 小区标识所代表的小区的语音编解码能力进行查询。
步骤 203: BSC 20将查询到的相应小区的语音编解码能力发送给 MSC
ServerlO;
本实施例中, BSC20通过基站子系统应用部分消息中的资源指示消息将 查询到的所有小区的语音编解码能力发送给 MSC Server 10, 由于该资源指 示消息一次只能上报一个小区的语音编解码能力, 为提高上报效率,在本发 明中,对资源指示消息进行扩展,如图 5所示,在 RESOURCE INDICATION 消息中增加基站子系统优选的编解码列表( BSS Preferred Codec List )信元, 可以通过该信元上报多个小区的语音编解码能力。
考虑到一个 BSC 20所管理的小区可能有很多,如果在一个 RESOURCE INDICATION消息中把所有这些小区的编解码能力同时上报给 MSC Server 10, 将会导致 RESOURCE INDICATION消息体长度过大, 因此, 本发明釆 用通过多条 RESOURCE INDICATION消息的方式上报该 BSC 20管理的所 有小区的语音编解码能力。 BSC20实际采用的资源指示消息的条数是从资源 请求消息的资源指示器信元中解析出的。
如图 6所示, 在 BSS Preferred Codec List信元中包括: 资源请求消息总 条数 ( Total Number of Segment ) 字段, 用于表示所有 RESOURCE INDICATION消息的条数, 资源请求消息总条数字段中的值与 BSC20从资 源请求消息的资源指示器信元中标识的数值是相同的;当前资源请求消息序 号 (Num of Segment )字段, 用于标识当前 RESOURCE INDICATION消息 在所有 RESOURCE INDICATION消息中的序号, 从而通知 MSC ServerlO 是否还有需要接收的资源指示消息; 当前资源请求消息长度 ( Length )字段, 用于表示当前 RESOURCE INDICATION 消息的长度; 以及在每条 RESOURCE INDICATION消息中包含的 m个小区的编解码能力信息, m可 作为参数进行设置, 比如 m可设置成 32等。
在 BSC20将要求上报语音编解码能力的小区的语音编解码能力上报给 MSG ServerlO后, MSC ServerlO就可以完成将接收到的小区的语音编解码 能力通过 Mc接口的控制信令与 MGW的语音编解码能力做分析比较,取出 公共语的语音编解码类型; 通过判决算法选择一公共的语音编解码类型, 并 通知 BSC20等步驟, 从而减少核心网指配无线网不能提供的语音版本情况 的发生,从而减少了语音编解码次数,有利于实现 Trfo,并提高了语音质量。

Claims

权 利 要 求 书
1、 一种无线网与核心网间语音编解码能力交互的实现方法, 其特征在 于, 包括以下步骤:
移动交换中心服务器( 10 )向基站控制器(20 )发送上报语音编解码能 力请求消息;
基站控制器(20 )接收到上报语音编解码能力请求消息后, 获取相应小 区的语音编解码能力,并将获取到的相应小区的语音编解码能力上^ =艮给移动 交换中心服务器(10 ) 。
2、 如权利要求 1所述实现方法, 其特征在于, 所述上报语音编解码能 力请求消息采用基站子系统应用部分消息中的资源请求消息。
3、 如权利要求 2所述实现方法, 其特征在于, 当移动交换中心服务器 ( 10 )要求基站控制器 (20 )上报其管理的全部小区的语音编解码能力时, 使用所述资源请求消息的小区标识符信元的 Spare字段进行标识; 当移动交 换中心服务器( 10 )要求基站控制器(20 )上报其管理的部分小区的语音编 解码能力时, 铼用所述 Spare字段和所述小区标识符信元的小区标识字段标 识出需上才艮语音编解码能力的小区。
4、 如权利要求 3所述实现方法, 其特征在于, 在所述 Spare字段中标 识 1时, 表示移动交换中心服务器( 10 )要求基站控制器(20 )上报其管理 的所有小区的语音编解码能力; 在所述 Spare字段中标识 0时, 表示移动交 换中心服务器( 10 )要求基站控制器(20 )从所述小区标识符信元的小区标 识字段中查询需上报语音编解码能力的小区。
5、 如权利要求 1所述实现方法, 其特征在于, 所述基站控制器 (20 ) 通过采用基站子系统应用部分消息中的资源指示消息将获取到的相应小区 的语音编解码能力上报给移动交换中心服务器( 10 ) 。
6、 如权利要求, 5所述实现方法, 其特征在于, 在所述资源指示消息中 扩展一基站子系统优选的编解码列表信元,在该基站子系统优选的编解码列 表信元中携带有一个或多个小区的语音编解码能力的信息。 '
7、 如权利要求 5所述实现方法, 其特征在于, 所述资源指示消息为多 条,且,所述资源指示消息的具体条数在所述上报语音编解码能力请求消息 中进行标识。
8、 如权利要求 7所述实现方法, 其特征在于, 所述上报语音编解码能 力请求消息采用基站子系统应用部分消息中的资源请求消息,所述资源指示 消息的具体条数在所述资源请求消息的资源指示器信元中进行标识。
9、 如权利要求 1所述实现方法, 其特征在于, 所述获取相应小区的语 音编解码能力的过程包括: 基站控制器.(20 )对接收到的上报语音编解码能 力请求消息进行解析,根据解析结果对需要上报语音编解码能力 小区进行 语音编解码能力的查询。
10、 如权利要求 2所述实现方法, 其特征在于, 所述资源请求还包括: 资源指示方式信元和周期信元,所述资源指示方式信元和周期信元分别对基 站控制器(20 )上报小区编解码能力时的上报方式和频度进行标识。
PCT/CN2007/003939 2007-11-08 2007-12-29 A method for realizing voice coding/decoding capability interaction between a radio network and a core network Ceased WO2009059477A1 (en)

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