WO2009059474A1 - System and method for multi-context multiplexing single time slot in multimedia gateway to transfer voice - Google Patents

System and method for multi-context multiplexing single time slot in multimedia gateway to transfer voice Download PDF

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Publication number
WO2009059474A1
WO2009059474A1 PCT/CN2007/003615 CN2007003615W WO2009059474A1 WO 2009059474 A1 WO2009059474 A1 WO 2009059474A1 CN 2007003615 W CN2007003615 W CN 2007003615W WO 2009059474 A1 WO2009059474 A1 WO 2009059474A1
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Prior art keywords
time slot
multimedia gateway
voice
context
call
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English (en)
French (fr)
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Haibo Ma
Zichun Zhou
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ZTE Corp
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ZTE Corp
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10Architectures or entities
    • H04L65/102Gateways
    • H04L65/1043Gateway controllers, e.g. media gateway control protocol [MGCP] controllers

Definitions

  • the present invention relates to the field of mobile communications, and more particularly to a system and method for multiplexing multiple independent voices in a single time slot in multiple contexts on an MGW (Multimedia Gateway).
  • MGW Multimedia Gateway
  • MGC Media Gateway Controller
  • MGW Media Gateway, Media Gateway
  • H.248, defined by ITU-T gateway control
  • the MGW provides an external TDM interface to implement interworking between the softswitch network and the BSC (Base Station Controller), PSTN (Public Switched Telephone Network) and other networks.
  • BSC Base Station Controller
  • PSTN Public Switched Telephone Network
  • the basic unit for providing a voice channel on the MGW is a time slot, and the minimum granularity of the TDM terminal defined in the H.248 protocol is also a time slot.
  • the compressed multi-channel bandwidth voice can be multiplexed into one time slot, such as four 16 Kbit/s voices or eight 8 Kbit/s voices.
  • the cost of laying TDM transmission lines is usually high.
  • the utilization efficiency of TDM resources can be improved and the cost can be greatly reduced.
  • the work of multiplexing and demultiplexing multiple voices in a single time slot is performed by an independent device, and the networking mode is as shown in FIG.
  • the MGW directly communicates with the BSC or the PSTN network element, if the multiplexing and demultiplexing of multiple voices in a single time slot can be completed in the MGW, the independent transmission multiplexing device can be saved, and the network can be saved.
  • each voice signal has a single time slot.
  • multiplexing terminals and multiplexing descriptors are defined, which can be used for multiplexing and demultiplexing operations of voice, video, and data streams in one time slot.
  • the existing processes and methods are only for multiplexing and demultiplexing multiple different types of media streams in one time slot, and more importantly, only for a single multimedia call within the same context.
  • multiple independent voice calls they should be handled in different contexts.
  • the granularity of BIT should also be used for representation.
  • there is currently no such representation in the H.248 protocol and there is also a lack of a description of the process of multiplexing multiple independent voice calls on a single time slot.
  • the present invention proposes to embed the function of multiplexing multiple voices in a single time slot on the MGW, and gives a method for the MGC to control the MGW to complete the multiplexing and demultiplexing function. Therefore, there is a need for a multi-context multiplexing single-slot voice delivery solution on a multimedia gateway that solves the problems in the related art described above.
  • a system for multi-context multiplexing single-slot voice transmission on a multimedia gateway includes: a multiplexing demultiplexing processing unit, disposed in the multimedia gateway, It is used to extract voice signals carried by different bits on one slot and to interact with the multimedia gateway.
  • the multimedia gateway is configured to parse a call setup message from the multimedia gateway controller to create a context, and after assigning the identity of the calling terminal to one or more bits on the time slot of the voice signal,
  • the demultiplexing processing unit is used, and the voice signal extracted by the multiplexing demultiplexing processing unit is switched to the called terminal in the context to establish a voice call between the calling terminal and the called terminal.
  • the contexts created during the establishment of a multi-channel voice call by the multimedia gateway are independent of each other, and each context maintains its own topology.
  • the call setup message is an H.248 command message.
  • Step S302 A media gateway controller sends a call to a multimedia gateway.
  • Step S304 after receiving the call setup message, the multimedia gateway parses the call setup message to create a context, and Extracting, by the demultiplexing processing unit, a voice signal carried by one or more bits in the time slot to establish a voice call within the media gateway; and step S306, if the multimedia gateway utilizes another unoccupied one of the time slots When the plurality of bits carry another voice signal, step S302 and step S304 are repeated to implement the multi-context multiplexing time slot to transmit the voice signal.
  • Step S304 includes the following steps: after receiving the setup call message, the multimedia gateway parses the call setup message to create a context, and assigns an identifier of the calling terminal to one or more bits in the time slot; and multiplexing demultiplexing
  • the processing unit extracts the voice signal carried by one or more bits in the time slot and switches the voice signal to the called terminal in the context to establish a voice call between the calling terminal and the called terminal.
  • the method further includes the step of: if the multimedia gateway controller specifies to use the one or more bits of the time slot to establish another voice call, if the specified one or more bits are the same as the bit specified by the previous voice call There is overlap, and the multimedia gateway returns a call setup failure message.
  • the multimedia gateway controller uses the bit representation packet to specify one time slot for the 7
  • the method for transmitting voice in a multi-context multiplexing single-slot on the MGW according to the present invention is to implement the multiplexing and demultiplexing function of the single-slot transmission multi-channel voice on the MGW, and create multiple contexts to exchange the slaves. Multiple voice signals extracted from different BIT bits in a single time slot share a channel of a multiplexing demultiplexing processing device, and a multi-channel voice call is simultaneously established by using one time slot on the MGW.
  • the invention realizes that the multiplex demultiplexing function is built in the MGW to realize that the independent multiplexing demultiplexing device is not set in the network, and the TDM transmission from the BSC/PSTN in which multiple voices are multiplexed in a single time slot is adopted.
  • the line is directly introduced into the MGW and terminated on the MGW, and the multiplexing and demultiplexing processing is completed inside the MGW. This improves the utilization efficiency of the TDM transmission line and reduces the networking.
  • FIG. 1 is a schematic diagram showing a conventional multiplexing demultiplexing device independent of an MGW networking
  • FIG. 2 is a diagram showing a system for multi-context multiplexing single-slot transmission of voice on a multimedia gateway according to the present invention
  • 3 is a flow chart showing a method for multi-context multiplexing single-slot transfer of voice on a multimedia gateway according to the present invention
  • FIG. 4 is a diagram showing multi-context multiplexing single time on a multimedia gateway according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram showing a frame structure for transmitting a plurality of voices using a single time slot according to another embodiment of the present invention
  • FIG. 6 is a diagram showing an MGC control according to another embodiment of the present invention. Schematic diagram of a flow of multi-context multiplexing single-slot transmission of multiple voices by the MGW; and FIG.
  • FIG. 7 is a diagram illustrating different BIT bits carried by processing single slots in multiple contexts within the MGW according to another embodiment of the present invention Schematic diagram of the speech signal.
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
  • 2 is a block diagram showing a system for multi-context multiplexing single-slot transfer of voice over a multimedia gateway in accordance with the present invention.
  • a system 200 for multi-context multiplexing single-slot voice transmission on a multimedia gateway according to the present invention includes a multimedia gateway 202, and the system further includes: multiplexing demultiplexing processing
  • the unit 204 is disposed in the multimedia gateway, and is configured to extract a voice signal carried by different bits on a time slot, and interact with the multimedia gateway 202.
  • the multimedia gateway 202 is configured to parse a call setup message from the multimedia gateway controller to create a context, and associate the time slot to the one after assigning the identity of the calling terminal to one or more bits on the time slot carrying the voice signal.
  • the demultiplexing processing unit 204 is used, and the voice signal tuned by the multiplexing demultiplexing processing unit 204 is switched to the called terminal in the context to establish a voice call between the calling terminal and the called terminal.
  • the call setup message is an H.248 command message.
  • Step S302 When the media gateway controller sends a call setup message to the multimedia gateway, the voice signal is specified for the voice signal.
  • Step S304 after receiving the call setup message, the multimedia gateway parses the call setup message to create a context, and the multiplexing demultiplexing processing unit extracts the time slot a voice signal carried by one or more of the bits to establish a voice call within the media gateway; and step S306, if the multimedia gateway utilizes another unoccupied one or more bits of the time slot to carry another voice signal At time, step S302 and step S304 are repeated to implement the multi-context multiplexing time slot to transmit the voice signal.
  • Step S304 includes the following steps: after receiving the setup call message, the multimedia gateway parses the call setup message to create a context, and assigns an identifier of the calling terminal to one or more bits in the time slot; and multiplexing demultiplexing
  • the processing unit extracts the voice signal carried by one or more bits in the time slot and switches the voice signal to the called terminal in the context to establish a voice call between the calling terminal and the called terminal.
  • the method further includes the step of: if the multimedia gateway controller specifies to use the one or more bits of the time slot to establish another voice call, if the specified one or more bits are the same as the bit specified by the previous voice call There is overlap, and the multimedia gateway returns a call setup failure message.
  • the multimedia gateway controller uses the bit representation packet to specify one time slot for carrying the voice signal and one or more bits in the time slot in the attributes of the calling terminal and the called terminal.
  • the call setup message is an H.248 command message.
  • the contexts created during the establishment of a multi-channel voice call by the multimedia gateway are independent of each other, and each context maintains its own topology.
  • 4 is a flow chart showing a method of multi-context multiplexing single-slot transfer of voice on a multimedia gateway in accordance with an embodiment of the present invention.
  • a method for multi-context multiplexing single-slot voice transmission on a multimedia gateway includes the following steps: Step bare S402, a device for multiplexing multiple independent voices in a single time slot is built into Implemented on the MGW instead of using a separate device to do this.
  • These newly added hardware and software are superimposed on the existing processing architecture of the MGW, and have no effect on the existing functions of the MGW; S404, defining a BIT bit representation packet in a single time slot, for indicating between the MGC and the MGW, which one or more BIT bits in a single time slot need to occupy a voice call, so that the H.248 protocol can be compared
  • the smaller time slot size represents the TDM terminal.
  • One time slot includes 8 BITs, and the BIT in one time slot can be divided into 1 to 8 voice channels by using the BIT bit representation packet;
  • Step S406 when the MGC needs to establish a multiplexed one channel in the single time slot on the MGW In a separate voice call, first specify a certain number of trunk lines and a specific time slot therein, and then use the BIT bit representation packet in the terminal attribute to specify which of the time slots or which BIT bits are used to carry the call.
  • Voice after the MGW parses the command for establishing a voice channel issued by the MGC and clarifies the required relay, time slot and BIT bit, the processing program on the MGW first creates a new context, and then the time slot is provided.
  • the processing device of the multiplexing demultiplexing function is connected, and the voice signal carried on the corresponding BIT bit is extracted from a single time slot, and the voice signal is exchanged to another terminal in the same context by the internal switching capability of the MG W.
  • this achieves the establishment of a voice call in the MGW (a basic call generally corresponds to a context, contains two terminals, respectively representing the main called, need The two terminals are physically connected or exchanged within the MGW to implement communication between the calling and the called parties.
  • Step naked S410 after the fourth step, if the MGC needs to continue to occupy the same trunk in the same time slot. The remaining one or several BIT bits for another call, the MGW needs to create a new context, which is completely independent of the context created in the fourth step, two on the
  • topology refers to the connection or exchange relationship between terminals in a context
  • Step S412 using multiple voice signals carried by different BIT bits on the same time slot, an identical need to be used
  • the channels of the demultiplexing processing device are multiplexed to complete the extraction of the respective speech signals, which are connected or switched to other terminals in their respective contexts through different ports on the processing device channel.
  • FIG. 5 is a schematic diagram of a frame structure for multiplexing multiple voices in a single time slot. As shown in the figure, a time slot includes 8 BIT bits.
  • the 8 BIT bits can be divided into 4 groups, 3 groups, and 8 groups to form a number of low-rate voice transmission channels (for example, when divided into 4 groups).
  • Channel 16Kbit/s bandwidth), the division of BIT bits and the number of channels in a single time slot can be arbitrary (of course, no more than 8 groups).
  • 6 is a schematic diagram showing a flow of an MGC controlling an MGW to perform multi-context multiplexing single-slot transfer of multiplexed voice according to the embodiment. As shown in FIG. 6, the process includes the following steps: Step S602: When the MGC requests the MGW to establish a new call, it specifies a certain time slot and a BIT bit thereof, such as BIT0/BIT1 in TS1 (TimeSlot).
  • Steps S604 ⁇ S608 after receiving the command, the MGW parses the H.248 command message, creates a new context C1, and assigns a terminal identifier T1 to BIT0/BIT1 of TS1, and then associates it with the multiplexing solution.
  • the multiplexing processing device extracts the voice signal carried on the BIT0/BIT1 of the TS 1; then the MGW returns a response to the MGC successfully processing the command; for a basic call, there are usually two parameters, so] VIGC will The command adds another force to the terminal ⁇ 2 in the context C1; after the MGW succeeds, the response of the successful processing is also given; finally, the voice stream exchange between T1 and ⁇ 2 is completed inside the MGW, and the user starts the call.
  • Terminals T1 and ⁇ 2 can be understood as representing the primary called party in a call, respectively.
  • FIG. 2 is a diagram showing a voice signal carried by processing different BIT bits of a single slot in a plurality of contexts within the MGW according to the embodiment.
  • the multiplex demultiplexing device inside the MGW extracts voice signals from different BITs of the time slot TS1, and completes voice stream exchange between the calling and called users within one context.
  • the contexts C1 and C2 can be understood as representing different voice calls, respectively.
  • the invention realizes that the multiplex demultiplexing function is built in the MGW to realize that the independent multiplexing demultiplexing device is not set in the network, and the TDM transmission from the BSC/PSTN in which multiple voices are multiplexed in a single time slot is adopted.
  • the line is directly introduced into the MGW and terminated on the MGW, and the multiplexing and demultiplexing processing is completed inside the MGW. This way, the utilization efficiency of the TDM transmission line is improved, and the networking is simplified.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Telephonic Communication Services (AREA)

Description

多媒体网关上多上下文复用单时隙
传递语音的系统及方法 技术领域 本发明涉及移动通讯领域, 具体地说, 涉及在 MGW (多媒体网关)上 的多个上下文中复用单个时隙传递多路相互独立的话音的系统和方法。 背景技术 随着通讯系统在经济和社会生活等各个领域曰益广泛的应用,通讯系统 技术本身也在快速发展之中, 软交换技术是目前固定、 移动通信网络普遍采 用的语音通信解决方案,软交换技术的主要特征是承载与控制分离, MGC(媒 体网关控制器, Media Gateway Controller )通过网关控制 ¼、议 ( H.248 , 由 ITU-T定义) 实现对 MGW (媒体网关, Media Gateway ) 的控制, 完成话路 媒体通道的建立和交换。 一般来讲, 在使用 TDM (时分复用, Time Division Multiplex )线路 (比 如 E1或 T1 )进行语音传输时, 每路话音需要占用一个时隙, 有 64Kbit/s的 带宽。 在软交换网络中, 由 MGW提供对外的 TDM接口, 实现软交换网络 与 BSC (基站控制器, Base Station Controller )、 PSTN (公共交换电话网, Public Switched Telephone Network )等网络的互通。 采用 TDM传输时, 在 MGW上提供话音通道的基本单位是一个时隙,在 H.248协议中定义的 TDM 终端的最小粒度也是一个时隙。 但根据目前现有的传输复用技术, 可以将经 过压缩的多路 4氐带宽的话音复用到一个时隙中, 比如 4路 16Kbit/s的话音或 8路 8Kbit/s的话音。 铺设 TDM传输线路的费用通常比较高昂, 通过使用这 样的传输复用技术, 可以提高 TDM资源的利用效率, 极大地降低成本。 通常,这种在单个时隙内复用和解复用多路话音的工作是由独立的设备 完成的, 其组网方式如图 1所示。 在 MGW直接对外出 TDM接口与 BSC或 PSTN网元互通时, 如果能够在 MGW 内部完成对单个时隙内多路话音的复 用和解复用, 则可以节省独立的传输复用设备, 使组网更为简洁, 进一步降 低组网成本。 然而, 如图 1 所示, 在复用解复用设备与 BSC/PSTN之间的 TDM传输线路上,一个时隙内复用了多路经过压缩的语音信号, 而在 MGW 与复用解复用设备之间的 TDM传输线路上, 则每路语音信号独占一个时隙。
1 P 16908 在 H.248协议中, 定义了复用终端和复用描述符,可用于在一个时隙中 语音、 视频、 数据流的复用和解复用操作。 但现有的流程和方法, 都仅是针 对一个时隙上多种不同类型的媒体流的复用和解复用, 更重要地, 都仅是针 对同一个上下文内的单个多媒体呼叫而言的。 对于多路独立的语音呼叫, 应以不同的上下文进行处理。 对于 TDM终 端, 应该也可以使用 BIT这样的粒度来进行表示, 但目前 H.248协议中缺少 这样的表示方法, 也缺少对于单个时隙上复用多路相互独立的语音呼叫的流 程描述。 目前, 在软交换领域, 特别是在 MGC和 MGW之间, 尚没有能够实现 在单个时隙内复用多路相互独立的话音的方法。 故本发明提出将单个时隙内 复用多路话音的功能内置在 MGW上 , 并给出了 MGC控制 MGW完成这种 复用解复用功能方法。 因此, 需要一种多媒体网关上多上下文复用单时隙传递语音的解决方 案, 能够解决上述相关技术中的问题。 发明内容 本发明旨在通过在 MGW 上内置单个时隙复用解复用多路相互独立的 话音的系统和方法, 节省独立的传输复用设备, 提高组网效率, 降低组网成 本。 根据本发明的一个方面,提供了一种多媒体网关上多上下文复用单时隙 传递语音的系统, 包括多媒体网关, 其特征在于, 包括: 复用解复用处理单 元 , 设置在多媒体网关内, 用于提取一个时隙上的不同比特位所承载的语音 信号, 以及与多媒体网关交互。 多媒体网关用于解析来自多媒体网关控制器的通话建立消息以创建上 下文, 在为 载语音信号的时隙上的一个或多个比特位分配主叫终端的标识 后^)夺该时隙关联至复用解复用处理单元, 以及将由复用解复用处理单元提取 的语音信号交换到上下文中的被叫终端, 以在主叫终端和被叫终端之间建立 语音通话。 在多媒体网关建立多路语音通话过程中所创建的各个上下文相互独立, 且各个上下文分别维护各自的拓朴。
2 P16908 通话建立消息为 H.248命令消息。 根据本发明的另一个方面,提供了一种用于前述系统的多媒体网关上多 上下文复用单时隙传递语音的方法, 包括以下步驟: 步骤 S302, 在媒体网关 控制器向多媒体网关下发通话建立消息时, 指定用于承载语音信号的一个时 隙以及时隙中的一个或多个比特位; 步骤 S304, 多媒体网关接收到通话建立 消息后, 对通话建立消息进行解析以创建上下文, 以及复用解复用处理单元 提取由时隙中的一个或多个比特位所承载的语音信号, 以在媒体网关内建立 语音通话; 以及步骤 S306, 如果多媒体网关利用时隙的其他未被占用的一个 或多个比特位承载另一路语音信号时, 重复步骤 S302和步骤 S304, 以实现 多上下文复用时隙传递语音信号。 步驟 S304包括以下步骤: 多媒体网关接收到建立通话消息后, 对通话 建立消息进行解析以创建上下文, 以及为时隙中的一个或多个比特位分配主 叫终端的标识; 以及复用解复用处理单元提取由时隙中的一个或多个比特位 所承载的语音信号, 并将语音信号交换到上下文中的被叫终端, 以在主叫终 端与被叫终端之间建立语音通话。 上述方法还包括以下步骤:在多媒体网关控制器指定使用时隙的一个或 多个比特位建立另一路语音通话时, 如果所指定的一个或多个比特位与前一 次语音通话所指定的比特位有重叠, 多媒体网关返回通话建立失败消息。 多媒体网关控制器使用比特位表示包来在主叫终端和被叫终端的属性 中指定用于 7|载语音信号的一个时隙以及时隙中的一个或多个比特位。 采用本发明所述的在 MGW上多上下文复用单时隙传递语音的方法,是 将单时隙传递多路语音的复用解复用功能内置在 MGW上实现, 创建多个上 下文来交换从单个时隙不同 BIT位上提取出来的多路语音信号, 共享一路复 用解复用处理器件通道, 利用 MGW上的一个时隙同时建立多路语音通话。 本发明通过将复用解复用功能内置于 MGW 内部实现使网络中不设置 独立的复用解复用设备, 以及将来自 BSC/PSTN的在单个时隙内复用了多路 语音的 TDM传输线路直接引入 MGW, 并在 MGW上终结, 在 MGW内部 完成复用解复用处理。 这样 提高了 TDM传输线路的利用效率, 筒化了组 网。
3 P 16908 本发明的其它特征和优点将在随后的说明书中阐述, 并且,部分地从说 明书中变得显而易见, 或者通过实施本发明而了解。 本发明的目的和其他优 点可通过在所写的说明书、 权利要求书、 以及附图中所特别指出的结构来实 现和获得。 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是示出现有的复用解复用设备独立于 MGW组网的示意图; 图 2 是示出根据本发明的多媒体网关上多上下文复用单时隙传递语音 的系统的框图; 图 3 是示出根据本发明的多媒体网关上多上下文复用单时隙传递语音 的方法的流程图; 图 4是示出根据本发明一个实施例的多媒体网关上多上下文复用单时 隙传递语音的方法的流程图; 图 5 是示出根据本发明另一个实施例的利用单个时隙传递多路语音的 帧结构示意图; 图 6是示出根据本发明另一个实施例的 MGC控制 MGW进行多上下文 复用单时隙传递多路语音的流程的示意图; 以及 图 7是示出根据本发明另一个实施例的在 MGW内部在多个上下文中处 理单时隙的不同 BIT位所承载的语音信号的示意图。 具体实施方式 下面将结合附图来详细说明本发明的实施例。 图 2 是示出根据本发明的多媒体网关上多上下文复用单时隙传递语音 的系统的框图。 参照图 2, 4艮据本发明的多媒体网关上多上下文复用单时隙 传递语音的系统 200包括多媒体网关 202 , 该系统还包括: 复用解复用处理
4 P16908 单元 204, 设置在所述多媒体网关内, 用于提取一个时隙上的不同比特位所 承载的语音信号, 以及与多媒体网关 202交互。 多媒体网关 202 用于解析来自多媒体网关控制器的通话建立消息以创 建上下文, 在为承载语音信号的该时隙上的一个或多个比特位分配主叫终端 的标识后将该时隙关联至复用解复用处理单元 204, 以及将由复用解复用处 理单元 204提耳又的语音信号交换到上下文中的被叫终端, 以在主叫终端和被 叫终端之间建立语音通话。 在该系统中, 通话建立消息为 H.248命令消息。 在多媒体网关 202 建立多路语音通话过程中所创建的多个上下文相互 独立, 多个上下文分别维护各自的拓朴。 图 3 是示出根据本发明的多媒体网关上多上下文复用单时隙传递语音 的方法的流程图。 参照图 3 , 居本发明的多媒体网关上多上下文复用单时 隙传递语音的方法包括以下步骤: 步骤 S302, 在媒体网关控制器向多媒体网 关下发通话建立消息时, 指定用于 载语音信号的一个时隙以及时隙中的一 个或多个比特位; 步骤 S304, 多媒体网关接收到通话建立消息后, 对通话建 立消息进行解析以创建上下文, 以及复用解复用处理单元提取由时隙中的一 个或多个比特位所承载的语音信号, 以在媒体网关内建立语音通话; 以及步 驟 S306,如果多媒体网关利用时隙的其他未被占用的一个或多个比特位承载 另一路语音信号时, 重复步骤 S302和步骤 S304, 以实现多上下文复用时隙 传递语音信号。 步驟 S304包括以下步骤: 多媒体网关接收到建立通话消息后, 对通话 建立消息进行解析以创建上下文, 以及为时隙中的一个或多个比特位分配主 叫终端的标识; 以及复用解复用处理单元提取由时隙中的一个或多个比特位 所承载的语音信号, 并将语音信号交换到上下文中的被叫终端, 以在主叫终 端与被叫终端之间建立语音通话。 上述方法还包括以下步骤:在多媒体网关控制器指定使用时隙的一个或 多个比特位建立另一路语音通话时, 如果所指定的一个或多个比特位与前一 次语音通话所指定的比特位有重叠, 多媒体网关返回通话建立失败消息。 多媒体网关控制器使用比特位表示包来在主叫终端和被叫终端的属性 中指定用于承载语音信号的一个时隙以及时隙中的一个或多个比特位。
5 P16908 在该方法中, 通话建立消息为 H.248命令消息。 在多媒体网关建立多路语音通话过程中所创建的各个上下文相互独立, 各个上下文分别维护各自的拓朴。 图 4 是示出根据本发明一个实施例的多媒体网关上多上下文复用单时 隙传递语音的方法的流程图。 参照图 4, 在该实施例中, 多媒体网关上多上 下文复用单时隙传递语音的方法包括以下步骤: 步裸 S402 , 将在单个时隙内复用多路相互独立的话音的装置内置到 MGW上实现, 而不是使用独立的设备来完成这一功能。 这需要在 MGW内 部增加复用解复用处理单元和控制该处理单元的程序, 这些新增加的软硬件 是叠加在 MGW现有的处理架构之上的, 对 MGW的现有功能没有影响; 步 S404, 定义单个时隙内的 BIT位表示包, 用于在 MGC和 MGW 之间表示需要占用单个时隙内的哪个或哪几个 BIT位来进行语音通话, 从而 实现 H.248协议能够以比时隙更小的粒度来表示 TDM终端。一个时隙包括 8 个 BIT, 可以通过使用 BIT位表示包将一个时隙中的 BIT划分为 1 ~ 8个语 音通道; 步驟 S406, 当 MGC需要在 MGW上建立复用于单个时隙内的一路独 立语音通话时, 首先指定某编号的中继线路和其中的特定时隙, 然后在终端 属性中使用 BIT位表示包来指定使用该时隙中的哪个或哪几个 BIT位来承载 本次通话的语音; 步骤 S408, 在 MGW解析 MGC下发的建立语音通道的命令并明确所 需要使用的中继、 时隙和 BIT位后, MGW上的处理程序首先新建一个上下 文, 然后将该时隙与具备复用解复用功能的处理器件进行连接, 从单个时隙 内提取出在相应 BIT位上承载的语音信号, 通过 MG W内部的交换能力, 将 语音信号交换到相同上下文中的另外一个终端上去, 这就实现了在 MGW建 立一个语音通话(一个基本呼叫一般来说对应于一个上下文, 包含两个终端, 分别代表主被叫,需要在 MGW内部对这两个终端在物理上进行接续或交换, 从而实现主被叫之间的连通); 步裸 S410, 在经过第四步之后, 如果 MGC需要继续占用相同中继相 同时隙中的其余一个或若干个 BIT位来进行另外一次通话, 则 MGW需要另 外新创建一个上下文, 该上下文与第四步中创建的上下文完全独立, 两个上
6 P 16908 下文分别维护各自的拓朴 (拓朴指一个上下文内各终端之间的接续或交换关 系); 步骤 S412, 在同一个时隙上利用不同 BIT位承载的多路语音信号, 需 要使用一个相同的复用解复用处理器件的通道来完成各自语音信号的提取, 这些提取出来的语音信号, 通过该处理器件通道上的不同端口接续或交换至 各自上下文中的其它终端。 这样就实现了不同上下文使用相同中继相同时隙 中的不同 BIT位来完成相互独立的语音通话; 以及 步骤 S414, 在 MGC指定使用相同时隙的不同 BIT位来建立不同的语 音通话时, 如果对于第二次通话所指定的 BIT位与第一次通话所指定的 BIT 位有重叠, 则对于 MGC第二次下发的通话建立命令, MGW应返回失败, 表明第二次通话建立失败。 下面结合图 5 ~图 7来说明本发明的另一个实施例。 图 5是在单个时隙内复用多路语音的帧结构示意图。如图所示, 一个时 隙包括 8个 BIT位, 可以将这个 8个 BIT位划分为 4组、 3组、 8组, 构成 若干个低速率的语音传输通道 (比如划分为 4组时每个通道 16Kbit/s带宽), 单个时隙内 BIT位的划分方式和通道数量可以是任意的(当然最多不能超过 8组)。 图 6是示出根据该实施例的 MGC控制 MGW进行多上下文复用单时隙 传递多路语音的流程的示意图。 如图 6所示, 该流程包括以下步骤: 步驟 S602, 在 MGC要求 MGW建立一个新的通话时, 它指定某个时 隙和其中 BIT位, 比如 TS1 ( TimeSlot, 时隙) 中的 BIT0/BIT1; 步骤 S604 ~ S608, MGW接收到该命令后, 对 H.248命令消息进行解 析,创建一个新的上下文 C1 ,并为 TS1的 BIT0/BIT1分配一个终端标识 T1 , 然后将它关联到复用解复用处理器件,提取出在 TS 1的 BIT0/BIT1上承载着 的语音信号; 然后 MGW返回给 MGC成功处理命令的应答; 对于一个基本 通话来说,通常有两方参ίρ, 所以 ] VIGC会命令在上下文 C1 中添力 ρ另外一个 终端 Τ2; MGW操作成功后同样给出成功处理的应答; 最后在 MGW内部完 成 T1和 Τ2之间语音流的交换,用户开始进行通话。 其中终端 T1和 Τ2可以 理解为分别代表一次通话中的主被叫用户,
7 Ρ 16908 同理,可以使用 TS1中的 BIT2/BIT3和上下文 C2建立另外的一次通话。 依此类推, 就实现了多上下文复用单时隙建立多路通话。 图 Ί是示出根据该实施例的在 MGW内部在多个上下文中处理单时隙的 不同 BIT位所承载的语音信号的示意图。 如图 7所示, 利用 MGW内部的复 用解复用器件从时隙 TS 1的不同 BIT为提取语音信号,并在一个上下文内部 完成主被叫用户之间的语音流交换。其中上下文 C1和 C2可以理解为分别代 表不同的语音通话。 本发明通过将复用解复用功能内置于 MGW 内部实现使网络中不设置 独立的复用解复用设备, 以及将来自 BSC/PSTN的在单个时隙内复用了多路 语音的 TDM传输线路直接引入 MGW, 并在 MGW上终结, 在 MGW内部 完成复用解复用处理。 这样 #文提高了 TDM传输线路的利用效率, 简化了组 网。 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。 凡在本发明的精神和 原则之内, 所作的任何 4爹改、 等同替换、 改进等, 均应包含在本发明的保护 范围之内。
8 P16908

Claims

权 利 要 求 书
1. 一种多媒体网关上多上下文复用单时隙传递语音的系统, 包括多媒体网 关, 其特征在于, 包括:
复用解复用处理单元, 设置在所述多媒体网关内, 用于提取一个时 隙上的不同比特位所承载的语音信号, 以及与所述多媒体网关交互。
2. 根据权利要求 1 所述的系统, 其特征在于, 所述多媒体网关用于解析来 自多媒体网关控制器的通话建立消息以创建上下文, 在为承载语音信号 的所述时隙上的一个或多个比特位分配主叫终端的标识后将所述时隙关 联至所述复用解复用处理单元, 以及将由所述复用解复用处理单元提取 的语音信号交换到所述上下文中的被叫终端, 以在所述主叫终端和所述 被叫终端之间建立语音通话。
3. 根据权利要求 2所述的系统, 其特征在于, 在所述多媒体网关建立多路 语音通话过程中所创建的各个上下文相互独立, 且所述各个上下文分别 维护各自的拓朴。
4. 根据权利要求 1至 3中任一项所述的系统, 其特征在于, 所述通话建立 消息为 H.248命令消息。
5. 一种用于前述任一项权利要求所述的系统的多媒体网关上多上下文复用 单时隙传递语音的方法, 其特征在于, 包括以下步驟:
步驟 S302 , 在媒体网关控制器向多媒体网关下发通话建立消息时, 指定用于承载语音信号的一个时隙以及所述时隙中的一个或多个比特 位;
步驟 S304, 所述多媒体网关接收到所述通话建立消息后, 对所述 通话建立消息进行解析以创建上下文, 以及复用解复用处理单元提取由 所述时隙中的所述一个或多个比特位所 ? 载的语音信号, 以在所述媒体 网关内建立语音通话;
步骤 S306 , 如果所述多媒体网关利用所述时隙的其他未被占用的 一个或多个比特位承载另一路语音信号时, 重复所述步骤 S302 和步骤 S304, 以实现多上下文复用时隙传递语音信号。
9 P 16908
6. 才艮据权利要求 5所述的方法,其特征在于,所述步骤 S304包括以下步糠: . 所述多媒体网关接收到所述建立通话消息后,对所述通话建立消息 进 4亍解析以创建所述上下文, 以及为所述时隙中的所述一个或多个比特 位分配主叫终端的标识;
所述复用解复用处理单元提取由所述时隙中的所述一个或多个比 特位所承载的语音信号, 并将所述语音信号交换到所述上下文中的被叫 终端, 以在所述主叫终端与所述被叫终端之间建立语音通话。
7. # 居权利要求 6所述的方法, 其特征在于, 还包括以下步骤:
在所述多媒体网关控制器指定使用所述时隙的一个或多个比特位 建立另一路语音通话时, 如果所指定的一个或多个比特位与前一次语音 通话所指定的比特位有重叠, 所述多媒体网关返回通话建立失败消息。
8. 才艮据权利要求 7所述的方法, 其特征在于, 所述多媒体网关控制器使用 比特位表示包来在所述主叫终端和所述被叫终端的属性中指定用于 载 语音信号的一个时隙以及所述时隙中的一个或多个比特位。
9. 根据权利要求 5所述的方法, 其特征在于, 在所述多媒体网关建立多路 语音通话过程中所创建的各个上下文相互独立, 所述各个上下文分别维 护各自的拓朴。
10. 根据权利要求 5至 9中任一项所述的方法, 其特征在于, 所述通话建立 消息为 H.248命令消息。
10 P 16908
PCT/CN2007/003615 2007-11-05 2007-12-14 System and method for multi-context multiplexing single time slot in multimedia gateway to transfer voice Ceased WO2009059474A1 (en)

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