WO2005057850A1 - Systeme de passerelle de medias - Google Patents

Systeme de passerelle de medias Download PDF

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Publication number
WO2005057850A1
WO2005057850A1 PCT/CN2004/000929 CN2004000929W WO2005057850A1 WO 2005057850 A1 WO2005057850 A1 WO 2005057850A1 CN 2004000929 W CN2004000929 W CN 2004000929W WO 2005057850 A1 WO2005057850 A1 WO 2005057850A1
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WO
WIPO (PCT)
Prior art keywords
remote
module
central
mgw
tdm
Prior art date
Application number
PCT/CN2004/000929
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English (en)
French (fr)
Inventor
Xiangjiang Qian
Jianjun Ren
Bo Zhao
Original Assignee
Huawei Technologies Co., Ltd.
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 Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to BRPI0413569-5A priority Critical patent/BRPI0413569A/pt
Priority to AU2004296492A priority patent/AU2004296492A1/en
Priority to EP04762065A priority patent/EP1646181A1/en
Publication of WO2005057850A1 publication Critical patent/WO2005057850A1/zh

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Classifications

    • 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
    • H04L65/1033Signalling gateways
    • H04L65/104Signalling gateways in the network
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/66Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
    • 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
    • H04L65/1023Media gateways
    • H04L65/103Media gateways in the network
    • 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 technical field of Next Generation Network (NGN), and particularly to a media gateway (MGW). Background of the invention
  • NGN is a comprehensive network architecture that can provide various services such as voice, data, video, and multimedia. It uses a packet-switched data network IP network as the core network.
  • the core network communicates with other networks through a media gateway (MGW).
  • MGW is the interface for other networks to access the IP network. It is responsible for the conversion of protocols and data between the core IP network and the access network.
  • the Media Gateway Controller (MGC) provides control functions such as call establishment and switching.
  • the MGW receives the media gateway control protocol sent by the MGC, and completes the conversion of media streams between other networks, such as the TDM network and the IP network.
  • the MGW structure is shown in FIG. 1 and includes a time division multiplexing (TDM) interface module, an IP interface module, a media conversion module, a gateway control module, and a maintenance management module.
  • TDM time division multiplexing
  • IP IP interface
  • the TDM interface module provides an interface from the MGW to a TDM network such as a public switched telephone network (PSTN).
  • PSTN public switched telephone network
  • the IP interface module provides the interface from the MGW to the IP network.
  • the media conversion module is used to complete the format conversion of the media stream between the TDM bearer and the IP bearer.
  • the gateway control module receives and processes the media gateway control protocol sent by the MGC, and controls the TDM interface module, the media conversion module, and the IP interface module to complete the format conversion of the media stream.
  • Maintenance management module Users use this module to manage and maintain the above-mentioned modules.
  • MGW Mobility Management Entity
  • Another solution is to use an access network device or a remote user box to aggregate users under the remote site, and then transmit all service data to the MGW of the core network for processing through the existing transmission network.
  • MGW completes the exchange of all speech channels and multimedia data.
  • the voice channel and service data between all local users at the remote site have to be transmitted to the central MGW for processing. Therefore, the load on the network from the MGW to the remote site is high, which makes the transmission cost high .
  • the main object of the present invention is to provide an MGW system, which can perform remote load offload, and can implement centralized management, solve the problem of connection between the remote office and the core network, and thereby reduce management costs and transmission. cost.
  • the media gateway MGW system includes a central MGW and one or more remote MGWs, where:
  • the central MGW includes: a central gateway control module, connected to the central TDM interface module, the central media conversion module and the central IP interface module, for controlling the central TDM interface module, the central media conversion module and the central IP interface module, and for controlling the remote MGW Remote TDM interface module and remote TDM switching module;
  • the center internal protocol conversion module is connected to the central gateway control module and the central TDM interface module, and is used to convert the MGW control protocol sent by the central gateway control module to the remote MGW to the central TDM.
  • the format recognized by the interface module is sent to the remote MGW through the central TDM interface module and the TDM transmission network;
  • the central media conversion module is connected to the central TDM interface module and the central IP interface module, and is used to implement media streaming between the TDM interface module and the IP interface. Format conversion between modules; a central TDM interface module, which is used to provide an interface from the central MGW to the external TDM network; a central IP interface module, Used to provide the interface from the central MGW to the external IP network;
  • Each remote MGW includes: a remote TDM interface module, which is used to provide the interface from the remote MGW to the TDM network; a remote TDM switch module, which is connected to the remote TDM interface module and is used to process the data received through the remote TDM interface module The speech path and service data between users under the remote MGW; the remote internal protocol conversion module is connected to the remote TDM interface module and is used to receive the MGW control sent by the central MGW transmitted from the TDM network through the remote TDM interface module Protocol, and the received MGW control protocol controls the remote TDM interface module and remote TDM switching module connected to the remote internal protocol conversion module.
  • the central MGW further includes a central maintenance management module, which is configured to establish a connection with each module of the central MGW and a remote MGW for maintenance management.
  • the remote MGW further includes a remote maintenance management agent module for establishing a connection with each module of the remote MGW for maintenance management.
  • the remote MGW further includes a remote gateway control proxy module, which is connected to the remote TDM interface module and the remote TDM switching module, and is used to control the remote TDM interface module and the remote TDM switching module;
  • the internal protocol conversion module is connected and receives the control protocol from the central MGW.
  • the central TDM interface module or the remote TDM interface module includes a relay interface or a user interface.
  • the user interface further includes a simple old telephone service POTS interface, an integrated business service network ISDN interface, or an asymmetric digital subscriber line ADLS interface.
  • the control protocol includes a network management protocol, a gateway control protocol, or signaling.
  • the MGW provided by the present invention includes a central MGW and a remote MGW.
  • the central MGW and the remote MGW are connected through an existing transmission network.
  • the central MGW implements centralized maintenance of each remote MGW connected. Management without the need for each remote MGW to perform separate maintenance management, thereby reducing network maintenance management costs.
  • the remote MGW itself has the ability to self-exchange service data, the voice channel and service data between local users at the site where the remote MGW is located do not need to be aggregated to the central MGW for exchange, and the load is offloaded nearby, saving transmission. Resources, reducing transmission costs.
  • FIG. 1 is a schematic diagram of an MGW in the prior art.
  • FIG. 2 is a schematic diagram of an MGW system according to the present invention.
  • FIG. 3 is a schematic diagram of an MGW system including a remote proxy module according to the present invention. Mode of Carrying Out the Invention
  • the MGW system of the present invention is composed of two parts, including a central MGW and one or more remote MGWs.
  • the central MGW controls each remote MGW to perform service data exchange, and centrally maintains and manages the remote MGW.
  • the remote MGW is mainly responsible for the exchange of business data between local users at the remote site. Detailed description is given below with reference to FIG. 2.
  • the central MGW includes a central maintenance management module, a central gateway control module, a central internal protocol conversion module, a central TDM interface module, a central IP interface module, and a central media conversion module.
  • the central maintenance management module is also used to manage and maintain each module of each remote MGW.
  • the dashed lines in Figure 2 indicate that the central maintenance management module can establish logic with these modules. Connection for management and maintenance.
  • the internal protocol conversion module of the center is used to implement the conversion of MGW control protocols such as the network management protocol and the gateway control protocol to the TDM network format, thereby enabling the center MGW to maintain the center.
  • the management and maintenance protocol of the management module can be transmitted to each module of the remote MGW through the TDM bearer.
  • the central gateway control module is also used to control the remote TDM interface module and remote TDM switching module of each remote MGW.
  • the protocol of the central gateway control module such as signaling And so on, it is also carried to the TDM network through the central internal protocol conversion module and passed to each remote MGW through the central TDM interface module.
  • the functions of the central TDM interface module, the central IP interface module, and the central media conversion module are the same as the corresponding modules described in the background.
  • the remote MGW includes a remote TDM interface module, a remote TDM switching module, and a remote internal protocol conversion module.
  • the remote TDM interface module provides the interface from the remote MGW to the PSTN network or other TDM networks.
  • the remote TDM switching module is mainly used to exchange voice channels and service data between local users at the office where the remote MGW belongs.
  • the remote TDM interface module and the remote TDM switching module are controlled by the central gateway control module of the central MGW to control the exchange of actual services, and are maintained and managed by the central maintenance management module of the central MGW.
  • the remote internal protocol conversion module has the same function as the central internal protocol conversion module of the central MGW. It is used to convert the control protocol of the remote MGW to the TDM transmission network and implement the control protocol interaction with the central MGW.
  • the remote MGW may further include a remote maintenance management proxy module and a remote gateway control proxy module, which are used to perform maintenance management and control on the remote MGW.
  • a remote maintenance management proxy module and a remote gateway control proxy module exist, the corresponding original center module's maintenance management and gateway control of the remote MGW can be realized by these two agent modules, respectively, and these two agent modules are maintained by the center MGW's center.
  • the management module and the central gateway control module perform control. After the central MGW establishes a connection with the remote MGW, the central maintenance management module and the central gateway control module control the remote maintenance management agent module and the remote gateway control agent module, respectively. Dashed lines indicate that the maintenance management agent module can establish logical connections with these modules Perform maintenance management.
  • the TDM interface modules of the central MGW and each remote MGW use standard transmission network interfaces to access the transmission network.
  • the central MGW and remote MGW are connected through the existing transmission network to achieve the connection between the central MGW and the remote MGW. Therefore, the central MGW and the remote MGW can be located in different geographical locations.
  • the remote TDM interface module provides users with various interfaces, such as simple and old telephone service (POTS) interface, integrated business service network (ISDN) interface, asymmetric digital subscriber line (ADLS) interface, and other broadband and narrowband user interfaces; and PSTN side
  • POTS simple and old telephone service
  • ISDN integrated business service network
  • ADLS asymmetric digital subscriber line
  • PSTN side The relay interface, such as a relay circuit interface using common or associated signaling, the user selects the required interface according to the actual situation.
  • POTS simple and old telephone service
  • ISDN integrated business service network
  • ADLS asymmetric digital subscriber line
  • PSTN side PSTN side
  • the relay interface such as a relay circuit interface using common or associated signaling, the user selects the required interface according to the actual situation.
  • the remote MGW is under the control of the central gateway control module of the central MGW, and the remote TDM switching module of the remote MGW completes the communication between the local users at the local site. Road or business data exchange.
  • a call between local users at a remote MGW office is taken as an example for detailed description.
  • a user under a remote MGW office initiates a local call, it firstly passes the path established between the remote MGW and the central MGW, that is, the remote TDM interface module-TDM transmission network-central TDM interface module-central internal protocol conversion module-central
  • the gateway control module uses this path to perform signaling interaction.
  • the central MGW and remote MGW control the remote TDM switching module to connect to the user by transmitting signaling, and establish the connection of the service channel between the local users.
  • the connection established by the MGW realizes the transmission of service data between local users, and the speech path and service data between users on the local network do not need to be aggregated to the central MGW.
  • the connection between the user side of the remote TDM interface module and the TDM transmission network side is a connection established under the control of the remote TDM switching unit.
  • service data is transmitted between the remote MGW and the central MGW, and the service data is transmitted by the remote MGW through TDM.
  • the transmission network passes to the central MGW, and Under the control of the central MGW, the data is converted into IP data and sent to the IP network for subsequent transmission based on the IP network.
  • a user under a remote MGW office initiates a call and transmits data to an IP network as an example.
  • the path established between the remote MGW and the central MGW is first used, that is, the remote TDM interface module-TDM transmission network-central TDM interface module-inside the center
  • the protocol conversion module-the central gateway control module, the remote MGW sends signaling to the central MGW, and establishes a service channel under the control of the central gateway control module, such as establishing a central IP interface module-central media conversion module-central TDM interface Module-TDM transmission network-
  • the connection of the remote TDM interface module sends the user's business data to the IP core network through this service channel from the TDM network where the user is located to the IP core network for subsequent service data transmission.
  • the connection between the user side of the remote TDM interface module and the TDM transmission network side is a connection established under the control of the remote TDM

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Telephonic Communication Services (AREA)
  • Communication Control (AREA)

Description

一种媒体网关系统
技术领域
本发明涉及下一代网络(NGN )技术领域, 特别是指一种媒体网关 ( MGW )。 发明背景
NGN是可以提供话音、数据、视频和多媒体等各种业务的综合网络 体系结构, 它采用分组交换数据网络 IP网为核心网络,核心网络通过媒 体网关 ( MGW ) 与其他网络互通。 MGW是其他网絡接入 IP网络的接 口, 负责核心 IP网络与接入网络之间协议和数据等媒体流的转换。媒体 网关控制器 (MGC )提供呼叫的建立、 切换等控制功能。 MGW接收 MGC发送的媒体网关控制协议,完成媒体流在其他网絡如 TDM网络和 IP网络之间进行转换。
目前, MGW结构如图 1所示, 包括时分复用 (TDM )接口模块、 IP接口模块、媒体转换模块、网关控制模块和维护管理模块。其中, TDM 接口模块提供 MGW到 TDM网络如公用交换电话网 ( PSTN ) 的接口。 IP接口模块提供 MGW到 IP网络的接口。 媒体转换模块用来完成媒体 流在 TDM承载到 IP承载之间的格式转换。网关控制模块接收处理 MGC 发送过来的媒体网关控制协议, 并去控制 TDM接口模块、 媒体转换模 块和 IP接口模块完成媒体流的格式转换。维护管理模块,用户通过该模 块对以上所述的各个模块进行管理和维护。
目前, MGW设置在 NGN核心 IP网络中, 由于用户线的限制, 对 于远端局点下的设备通过 MGW接入 IP网络存在着地理方面的问题。目 前的一种解决方法, 是将 MGW设备建立在各个远端局点处, 但因为各 MGW都是独立网元, 在网络运行中, 各远端局点下的 MGW的维护管 理需分别独立进行, 使得维护管理的成本较高。
另一种解决方法是使用接入网设备或者远端用户框, 对远端局点下 的用户进行汇聚, 再通过已有的传输网絡, 将全部业务数据传输到核心 网络的 MGW进行处理, 由 MGW完成全部话路及多媒体数据的交换。 但是远端局点下的所有本地用户之间的话路和业务数据也不得不通过 远程传输到中心 MGW进行处理, 因此造成 MGW到远端局点这段网络 的负荷很高, 使传输成本较高。 发明内容
有鉴于此, 本发明的主要目的在于提供一种 MGW系统, 使其能进 行负荷的远端卸载, 又能实现集中管理, 解决远端局点与核心网络的连 接问题, 进而降低管理成本和传输成本。
本发明所述媒体网关 MGW系统, 包含一个中心 MGW和一个或一 个以上的远端 MGW, 其中,
中心 MGW包括: 中心网关控制模块, 与中心 TDM接口模块、 中 心媒体转换模块和中心 IP接口模块相连,用来控制中心 TDM接口模块、 中心媒体转换模块和中心 IP接口模块,以及控制远端 MGW的远端 TDM 接口模块和远端 TDM交换模块; 中心内部协议转换模块, 与中心网关 控制模块和中心 TDM接口模块相连, 用来将中心网关控制模块发向远 端 MGW的 MGW控制协议转换为中心 TDM接口模块识别的格式, 通 过中心 TDM接口模块、 TDM传输网发送给远端 MGW; 中心媒体转换 模块, 与中心 TDM接口模块和中心 IP接口模块相连, 用来实现媒体流 在 TDM接口模块和 IP接口模块之间的格式转换;中心 TDM接口模块, 用来提供中心 MGW到外部所述 TDM网络的接口; 中心 IP接口模块, 用来提供中心 MGW到外部 IP网络的接口;
每个远端 MGW包括: 远端 TDM接口模块, 用来提供远端 MGW 到 TDM网络的接口;远端 TDM交换模块,与远端 TDM接口模块相连, 用来处理通过远端 TDM接口模块接收的远端 MGW下用户间话路和业 务数据; 远端内部协议转换模块, 与远端 TDM接口模块相连, 用来通 '过远端 TDM接口模块接收从 TDM网络传输过来的中心 MGW发送的 MGW控制协议, 并由接收的 MGW控制协议控制与远端内部协议转换 模块相连的远端 TDM接口模块和远端 TDM交换模块。
其中, 所述的中心 MGW进一步包括中心维护管理模块, 用来与所 述中心 MGW和远端 MGW的各个模块建立连接, 进行维护管理。
其中, 所述的远端 MGW进一步包括远端维护管理代理模块, 用来 与所述的远端 MGW的各个模块建立连接, 进行维护管理。
其中, 所述的远端 MGW进一步包括远端网关控制代理模块, 与远 端 TDM接口模块和远端 TDM交换模块相连, 用来控制远端 TDM接口 模块和远端 TDM交换模块; 以及与远端内部协议转换模块相连, 接收 来自中心 MGW的控制协议。
其中,所述的中心 TDM接口模块或远端 TDM接口模块包括中继接 口或用户接口。
其中 , 所述的用户接口进一步包括简易老式电话业务 POTS接口、 综合业务服务网 ISDN接口或非对称数字用户线 ADLS接口。
其中, 所述的控制协议包括网管协议、 网关控制协议或信令。
由上述方法可以看出, 本发明提供的 MGW包括中心 MGW和远端 MGW, 中心 MGW和远端 MGW通过现有的传输网络连接, 中心 MGW 实现了对所连接的各个远端 MGW进行集中的维护管理, 而不需要各个 远端 MGW各自进行单独的维护管理, 因此降低了网絡维护管理成本。 同时由于远端 MGW 自身具有业务数据的自交换的能力, 所以远端 MGW 所在局点的本地用户之间的话路和业务数据不需要汇聚到中心 MGW进行交换, 实现负荷的就近卸载, 节省了传输资源, 降低了传输 成本。 附图简要说明
图 1为现有技术下 MGW的示意图。
图 2为本发明 MGW系统的示意图。
图 3为本发明包含远端代理模块的 MGW系统的示意图。 实施本发明的方式
下面结合附图对本发明进行详细描述。
本发明的 MGW系统由两部分组成, 包含一个中心 MGW和一个或 一个以上的远端 MGW。 中心 MGW控制各远端 MGW进行业务数据交 换, 及对远端 MGW进行集中维护管理; 远端 MGW主要负责所在远端 局点下本地用户间的业务数据交换, 实现负荷的就近卸载。 以下参见图 2进行详细说明。
如图 2所示, 中心 MGW包括中心维护管理模块、 中心网关控制模 块、 中心内部协议转换模块、 中心 TDM接口模块、 中心 IP接口模块和 中心媒体转换模块。
其中, 中心维护管理模块除了背景技术中所述原有的功能外, 还用 来对各个远端 MGW的各个模块进行管理和维护, 图 2中的虚线表示中 心维护管理模块可以与这些模块建立逻辑上的连接, 从而进行管理和维 护。 中心内部协议转换模块, 用来实现 MGW控制协议如网管协议、 网 关控制协议到 TDM网络格式的转换, 从而使得中心 MGW的中心维护 管理模块的管理维护协议得以经过 TDM承载传输到远端 MGW的各个 模块。 中心网关控制模块除了背景技术中所述原有的功能外, 还用来对 各个远端 MGW的远端 TDM接口模块和远端 TDM交换模块进行控制, 其中, 中心网关控制模块的协议如信令等, 也通过中心内部协议转换模 块承载到 TDM网络, 经过中心 TDM接口模块传递给各个远端 MGW。 中心 TDM接口模块、 中心 IP接口模块和中心媒体转换模块与背景技术 中所述相应模块的功能相同。
远端 MGW包括远端 TDM接口模块、 远端 TDM交换模块和远端 内部协议转换模块。
其中,远端 TDM接口模块提供远端 MGW到 PSTN网络或其他 TDM 网络的接口。 远端 TDM交换模块, 主要用来实现远端 MGW所属局点 下本地用户间的话路和业务数据的交换。 远端 TDM接口模块和远端 TDM交换模块由中心 MGW的中心网关控制模块进行控制, 控制其实 现业务的交换, 并由中心 MGW的中心维护管理模块进行维护管理。 远 端内部协议转换模块与中心 MGW的中心内部协议转换模块功能相同, 用来将远端 MGW的控制协议转换后承载到 TDM传输网络上, 实现与 中心 MGW进行控制协议的交互。
另外, 如图 3所示, 远端 MGW还可包括远端维护管理代理模块和 远端网关控制代理模块, 用来对所在远端 MGW进行维护管理和控制。 当存在维护管理代理模块和网关控制代理模块时, 相应的原中心模块对 远端 MGW的维护管理和网关控制可分別由这两个代理模块实现, 这两 个代理模块分别由中心 MGW的中心维护管理模块和中心网关控制模块 进行控制, 中心 MGW与远端 MGW建立连接后, 中心维护管理模块和 中心网关控制模块分别对远端维护管理代理模块和远端网关控制代理 模块进行控制。 虛线代表维护管理代理模块可与这些模块建立逻辑连接 进行维护管理。
中心 MGW和各远端 MGW的 TDM接口模块均使用标准的传输网 络接口接入传输网络, 中心 MGW和远端 MGW之间通过现有的传输网 络连接起来, 实现中心 MGW与远端 MGW的连接, 因此中心 MGW和 远端 MGW可以位于不同的地理位置。
远端 TDM接口模块给用户提供了各类接口, 例如简易老式电话业 务(POTS )接口、 综合业务服务网 (ISDN )接口、 非对称数字用户线 ( ADLS )接口等宽窄带用户接口; 以及 PSTN侧的中继接口, 如使用 共路或随路信令的中继电路接口, 用户根据实际情况选择所需的接口。 当远端局点下的本地用户间进行业务数据交换时, 远端 MGW在中心 MGW的中心网关控制模块控制下, 由远端 MGW的远端 TDM交换模 块完成所在局点的本地用户之间的话路或业务数据的交换。
参照图 2,以远端 MGW局点下本地用户之间的呼叫为例详细说明。 远端 MGW局点下的用户发起本地呼叫时, 首先通过远端 MGW和中心 MGW之间建立的通路, 即远端 TDM接口模块- TDM传输网络-中心 TDM接口模块 -中心内部协议转换模块 -中心网关控制模块这条通路 '进行信令的交互,中心 MGW与远端 MGW通过传递信令控制远端 TDM 交换模块为该用户进行接续, 建立本地用户之间的业务通道的连接, 而 后通过远端 MGW建立的该连接, 实现本地用户间业务数据的传输, 本 地网用户之间的话路和业务数据不需要汇聚到中心 MGW。 其中, 远端 TDM接口模块的用户侧与 TDM传输网侧的连接是通过远端 TDM交换 单元的控制下建立的连接。
当属于不同远端 MGW局点下的用户之间进行话路或业务数据传输 时, 在通过信令建立连接后, 远端 MGW和中心 MGW之间传递业务数 据, 业务数据由远端 MGW经过 TDM传输网络传递到中心 MGW, 并 在中心 MGW的控制下将数据转换成 IP数据发送到 IP网络上 , 进行后 续的基于 IP网络的传输。
参照图.2 , 以远端 MGW局点下的用户发起呼叫、 数据传输到 IP网 络为例进行说明。 远端 MGW下用户对另一个远端 MGW下的用户发起 呼叫时, 首先通过远端 MGW和中心 MGW之间建立的通路, 即远端 TDM接口模块 - TDM传输网络-中心 TDM接口模块-中心内部协议 转换模块 -中心网关控制模块这条通路, 远端 MGW将信令发送给中心 MGW, 在中心网关控制模块的控制下建立业务通道, 如建立中心 IP接 口模块 -中心媒体转换模块 -中心 TDM接口模块 - TDM传输网络-远 端 TDM接口模块的连接, 通过这条用户所在 TDM网络到 IP核心网络 的业务通道,将用户的业务数据发送到 IP核心网络,进行后续的业务数 据传输。其中,远端 TDM接口模块的用户侧与 TDM传输网侧的连接是 通过远端 TDM交换单元控制下建立的连接。
以上所述仅为本发明的较佳实施例而已, 并不用以限制本发明, 凡 在本发明的精神和原则之内, 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、 一种媒体网关 MGW 系统, 其特征在于, 包含一个中心 MGW 和一个或一个以上远端 MGW, 其中, 中心 MGW包括:
中心网关控制模块, 与中心 TDM接口模块、 中心媒体转换模块和 中心 IP接口模块相连, 用来控制中心 TDM接口模块、 中心媒体转换模 块和中心 IP接口模块,以及控制远端 MGW的远端 TDM接口模块和远 端 TDM交换模块;
中心内部协议转换模块, 与中心网关控制模块和中心 TDM接口模 块相连, 用来将中心网关控制模块发向远端 MGW的 MGW控制协议转 换为中心 TDM接口模块识别的格式, 通过中心 TDM接口模块、 TDM 传输网发送给远端 MGW;
中心媒体转换模块,与中心 TDM接口模块和中心 IP接口模块相连, 用来实现媒体流在 TDM接口模块和 IP接口模块之间的格式转换;
中心 TDM接口模块, 用来提供中心 MGW到外部所述 TDM网络 的接口;
中心 IP接口模块, 用来提供中心 MGW到外部 IP网络的接口; 每个远端 MGW包括:
远端 TDM接口模块, 用来提供远端 MGW到 TDM网络的接口; 远端 TDM交换模块,与远端 TDM接口模块相连,用来处理通过远 端 TDM接口模块接收的远端 MGW下用户间话路和业务数据;
远端内部协议转换模块, 与远端 TDM接口模块相连, 用来通过远 端 TDM接口模块接收从 TDM网络传输过来的中心 MGW发送的 MGW 控制协议, 并由接收的 MGW控制协议控制与远端内部协议转换模块相 连的远端 TDM接口模块和远端 TDM交换模块。
2、 才艮据权利要求 1 所述的媒体网关系统, 其特征在于, 所述的中 心 MGW进一步包括中心维护管理模块, 用来与所述中心 MGW和远端 MGW的各个模块建立连接, 进行维护管理。
3、 根据权利要求 2 所述的媒体网关系统, 其特征在于, 所述的远 端 MGW进一步包括远端维护管理代理模块, 用来与所述的远端 MGW 的各个模块建立连接, 进行维护管理。
4、 根据权利要求 1 所述的媒体网关系统, 其特征在于, 所述的远 端 MGW进一步包括远端网关控制代理模块, 与远端 TDM接口模块和 远端 TDM交换模块相连, 用来控制远端 TDM接口模块和远端 TDM交 换模块; 以及与远端内部协议转换模块相连, 接收来自中心 MGW的控 制协议。
5、 根据权利要求 1 所述的媒体网关系统, 其特征在于, 所述的中 心 TDM接口模块或远端 TDM接口模块包括中继接口或用户接口。
6、 根据权利要求 5 所述的媒体网关系统, 其特征在于, 所述的用 户接口进一步包括简易老式电话业务 POTS接口、综合业务服务网 ISDN 接口或非对称数字用户线 ADLS接口。
7、 根据权利要求 1 所述的媒体网关系统, 其特征在于, 所述的控 制协议包括网管协议、 网关控制协议或信令。
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