WO2007000093A1 - Agent de commande de passerelle et procédé de mise en œuvre associé - Google Patents

Agent de commande de passerelle et procédé de mise en œuvre associé Download PDF

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Publication number
WO2007000093A1
WO2007000093A1 PCT/CN2006/001213 CN2006001213W WO2007000093A1 WO 2007000093 A1 WO2007000093 A1 WO 2007000093A1 CN 2006001213 W CN2006001213 W CN 2006001213W WO 2007000093 A1 WO2007000093 A1 WO 2007000093A1
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WIPO (PCT)
Prior art keywords
gateway
control agent
media gateway
media
gateway control
Prior art date
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PCT/CN2006/001213
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English (en)
French (fr)
Inventor
Yangbo Lin
Original Assignee
Huawei Technologies Co., Ltd.
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Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to CN2006800133350A priority Critical patent/CN101164306B/zh
Publication of WO2007000093A1 publication Critical patent/WO2007000093A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/102—Gateways
    • H04L65/1043—Gateway controllers, e.g. media gateway control protocol [MGCP] controllers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1101—Session protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/56—Provisioning of proxy services
    • H04L67/564—Enhancement of application control based on intercepted application data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/56—Provisioning of proxy services
    • H04L67/565—Conversion or adaptation of application format or content

Definitions

  • Gateway control agent and implementation method thereof
  • the present invention relates to a Gateway Control Agent (GCA) technology in a network, and in particular to a gateway control agent based on the H.248 protocol and an implementation method thereof.
  • GCA Gateway Control Agent
  • the Media Gateway Controller (MGC) and Media Gateway (MG) are two key components in a packet network.
  • the MGC is responsible for the call control function, and the MG is responsible for the service bearer function, thereby separating the call control plane and the service bearer plane, thereby fully sharing network resources, simplifying equipment upgrades and service expansion, and greatly reducing development and maintenance costs.
  • Figure 1 is a schematic diagram of an MGC and MG networking in a packet network.
  • the Media Gateway Control Protocol is the main protocol for communication between the MG and the MGC.
  • H.248/MeGaCo the Internet Engineering Task Force
  • MGCP the Internet Engineering Task Force
  • the H.248 MeGaCo protocol was established by the IETF and the International Telecommunications Union ITU in 2000. It was jointly formulated in November and revised in June 2003.
  • terminals various resources on the MG are abstractly represented as terminals (Termination).
  • the terminal is further divided into physical terminals and temporary (Ephemeral) terminals.
  • the former represents some semi-permanent physical entities, such as Time Division Multiplex (TDM) channels, and the latter represents some temporary applications.
  • Released public resources such as Real-time Transport Protocol (RTP) flows.
  • the combination between terminals is abstracted as a context.
  • the context can contain multiple terminals, and thus the relationship between the terminals is described in terms of topology. Based on this abstract model of the protocol, the connection of the call is actually the operation of the terminal and the context.
  • command types include Add B, Modify, Subtract, Move, AuditValue, Audit Capabilities, Notify, ServiceChange.
  • Command parameters also known as descriptors, are classified as Property, Signal, Event, and Statistic. Business phase The logical parameters are logically aggregated into packages (Package
  • the original model of the H.248 protocol is for the MGC-MG control pair, that is, the MGC understands the resource status on the MG and directly controls it.
  • the MGC understands the resource status on the MG and directly controls it.
  • it is complicated and cumbersome to directly control the MG with the MGC, which is inconvenient for layered control and simplified operation.
  • the technical problem to be solved by the present invention is to provide a gateway control agent and an implementation method thereof, which can make the control of the media gateway controller simple and effective for the media gateway in order to overcome the deficiencies of the prior art.
  • the technical solution adopted by the present invention is to provide a gateway control agent, which is disposed between a media gateway controller of a packet network and a plurality of media gateways, and can establish a mapping relationship between the media gateway controller and the media gateway.
  • the media gateway controller uniformly requests the gateway control agent to provide a resource capability of a certain service, and the gateway control agent selects an appropriate resource capability among the media gateways managed by the gateway, and controls the proxy represented by the single media gateway domain and the gateway.
  • the mapping between the media gateway aggregation domains and the media gateway controller's control of the resource capabilities in the media gateway aggregation domain represented by the gateway control proxy is mapped by the gateway control proxy to the resource capabilities in the single media gateway domain.
  • the mapping relationship established between the media gateway controller and the media gateway includes mapping of various resource capabilities.
  • the gateway control agent represents the request identifier of the media gateway controller or operates a certain resource capability on behalf of the media gateway, and the media gateway represents the request identifier of the gateway control agent or operates a certain resource capability, and the gateway control proxy can be controlled by the gateway.
  • a mapping relationship between the resource capabilities of the proxy identifier and the resource capabilities identified by the media gateway is operationally corresponding.
  • a one-to-one correspondence between resource capabilities and states on the media gateway can be maintained between the gateway control agent and the media gateway, and resource capabilities and states in the media gateway set can be maintained between the media gateway controller and the gateway control agent.
  • the gateway control agent establishes a mapping relationship between the resource capabilities at the two levels and corresponds in operation.
  • the gateway control agent may also establish an operation mapping relationship between the media gateway controller and the media gateway, where the resource capability includes allocation and release of resource capabilities and various combinations, and/or Feature modification and change notification of resource capabilities, and/or state maintenance and state synchronization of resource capabilities.
  • the present invention also provides a gateway control agent implementation method, including: (a) a media gateway uniformly registers with a gateway control agent disposed between a media gateway controller of a packet network and a plurality of media gateways, and the gateway control agent represents The media gateway set is registered with the media gateway controller; (b) the gateway control agent selects a suitable media gateway according to the service provision request sent by the media gateway controller, and sends a command to the media gateway to request the service; (c), The media gateway sends a response command to the gateway control agent; (d), the gateway control agent performs a corresponding operation according to the response command from the media gateway and sends a response command to the media gateway controller, and the gateway control agent is at the media gateway controller and A mapping relationship is established between media gateway
  • the establishing a mapping relationship between the media gateway controller and the media gateway includes establishing a mapping to the terminal, and/or mapping the context.
  • the mapping to the context includes: the gateway control agent assigns and identifies a context for the request of the media gateway controller on behalf of the media gateway set; the media gateway allocates and identifies a context for the request of the gateway control proxy; the gateway control agent is in the A context is established between the context assigned and identified by the gateway control agent and the context assigned and identified by the media gateway, and corresponds in operation.
  • the mapping to the terminal includes mapping to the physical terminal and mapping to the temporary terminal.
  • Mapping the physical terminal includes: maintaining, between the gateway control proxy and the media gateway, a physical terminal on the media gateway and One-to-one correspondence of states; one-to-one correspondence between physical gateways and their states in the set of media gateways is maintained between the media gateway controller and the gateway control agent; the gateway control agent establishes mappings between physical terminals on the two levels The relationship corresponds to the operation; mapping to the temporary terminal includes: between the gateway control agent and the media gateway, the media gateway will allocate or release the temporary terminal according to the request of the gateway control agent; between the media gateway controller and the gateway control agent The temporary control terminal will be allocated or released by the gateway control agent according to the request of the media gateway controller; the gateway control agent establishes a mapping relationship between the temporary terminals on the two levels and corresponds in operation.
  • the operation includes operations on the terminal and the context, and the operation of the pair of terminals and the context includes at least one of the following operations: adding the terminal to the context, deleting the terminal from the context, moving the terminal between the contexts, modifying the terminal, and initiating the terminal Notification, audit terminal, and context, terminal service changes.
  • the mapping control agent further includes a mapping relationship between the media gateway controller and the media gateway for operations on the terminal and the context.
  • the invention has the beneficial effects that, since the present invention uses a gateway control agent, the media gateway controller treats multiple media gateways as a set of resources without concern for the details of a specific media gateway. Layer control and simplifies operation.
  • FIG. 1 is a schematic diagram of a media gateway controller (MGC) and a media gateway (MG) networking in a conventional packet network;
  • GCA Gateway Control Agent
  • FIG. 3 is a schematic diagram of an interaction routine of the MGC, GCA, and MG based on the H.248 protocol in the present invention. detailed description
  • the GCA (Gateway Control Agent) referred to in the present invention is a functional entity introduced between the original MGC and the MG, and its proxy MGC controls the MG.
  • GCA represents a collection of all MGs managed under it, with a resource capacity equivalent to the sum of the resource capabilities of the MGs under it. Therefore, the MGC can treat the service as if it were an MG.
  • GCA is also the representative of MGC, so MG is registered with GCA, and GCA is registered with MGC on behalf of MG.
  • the registration mechanism here adopts H.248 existing registration mechanism. As long as one MG has successfully registered with the GCA, GCA has the ability to provide services to MGC.
  • the specific principle of GCA is shown in Figure 2.
  • the understanding of the resource capabilities of the MG set between the GCA and the MGC is equivalent.
  • the resource capabilities of the MG set between the SP, the GCA and the MGC are in meaning, scope, form, identity, The operation and other aspects are consistent.
  • the understanding of the resource capabilities of the MG between the GCA and the MG is equivalent, that is, the resource capabilities of the MG between the GCA and the MG are consistent in meaning, scope, form, identity, operation, and the like.
  • GCA establishes a mapping between these two understandings.
  • the GCA presents the resource capabilities of the MGs managed by it to the MGC as a whole, and the MGC does not have to care about which MG provides a certain resource capability.
  • the MGC uniformly requests the GCA to provide the resource capability of a certain service.
  • the GCA selects the resource capability that satisfies the request in the MG managed by the GCA, and maps between the single MG domain and the MG aggregation domain represented by the GCA, so that the MGC
  • the control of the resource capabilities in the MG set domain represented by the GCA is also mapped to the resource capabilities of a single MG domain through the GCA.
  • the GCA establishes a mapping relationship between various resource capabilities between the call model of the MGC and the call model of the MG, including mapping of terminals, contexts, and the like. For context, it represents the combined relationship of terminals associated with a call on the MG, which is requested by the MGC and assigned and identified by the MG.
  • the GCA allocates and identifies a context for the request of the MG on behalf of the MG, and the MG represents itself.
  • the GCA allocates and identifies a context for the request, and the GCA establishes a mapping between the contexts on the two levels and corresponds in operation.
  • a physical terminal it represents some physical entities with semi-permanent existence, such as TDM channels, etc., so a one-to-one correspondence between physical terminals and their states on the MG will be maintained between the GCA and the MG, in MGC and GCA.
  • the one-to-one correspondence between the physical terminals and their states in the MG set will be maintained, and the GCA establishes a mapping relationship between the physical terminals on the two layers and corresponds in operation.
  • the temporary terminal For the temporary terminal, it represents some public resources released after the temporary application, such as RTP flow, etc., so the temporary terminal will be allocated or released by the MG according to the request of the GCA between the GCA and the MG, and the GCA will be between the MGC and the GCA.
  • the GCA allocates or releases the temporary terminal according to the request of the MGC, and the GCA establishes a mapping relationship between the temporary terminals on the two levels and corresponds to the operation. Accordingly, the GCA also establishes mapping relationships between resource capabilities (eg, terminals, contexts, etc.) at these two levels, including resource capability allocation and release, and various combinations, Feature modification and change notification of resource capabilities, state maintenance of resource capabilities, and state synchronization.
  • resource capabilities eg, terminals, contexts, etc.
  • adding a terminal to a context deleting a terminal from a context, moving a terminal between contexts, modifying a terminal, initiating a notification from a terminal, auditing a terminal or context, changing a terminal service, and the like.
  • the H.248 protocol-based gateway control proxy implementation method of the present invention includes these basic steps: First, a gateway control proxy is set up between the MGC of the packet network and multiple MGs, and the MG is uniformly registered with the GCA. GCA, on behalf of the MG, registers with the MGC. When the MGC needs an MG to provide services to it, the MGC sends a command to the GCA to request a certain service; the GCA selects an appropriate MG according to the request of the MGC, and sends a command to the MG to request the service; The GCA sends a response command. The GCA performs a corresponding operation according to the response of the MG. The operation is the operation mentioned above, and sends a response command to the MGC, and the GCA establishes a mapping relationship between the MGC and the MG.
  • the implementation process of the present invention will be exemplified below.
  • FIG. 3 is a diagram showing the interaction routine of the MGC, GCA, MG based on the H.248 protocol in the present invention.
  • the diagram illustrates the creation of two temporary terminals (for different IP domains)
  • the MGC sends an Add request command to the GCA, and the context identifier is "one" to indicate that the GCA is requested to allocate a context, and the terminal identifier is "$" to indicate that a temporary terminal is added in the context, and the IP domain identifier is " Realml "indicates the IP domain that the temporary terminal is targeting.
  • step 2 the GCA selects an appropriate MG according to the request of the MGC, and sends an Add request command to the MG, and the context identifier is "one" to indicate that the requesting MG allocates a context, and the terminal identifier is "$" to indicate in the context.
  • step 3 The MG sends an Add response command to the GCA, with the context identifier "Cm” indicating the context assigned by the MG, and the terminal identifier being "Tml” indicating the temporary terminal added by the MG in the context.
  • step 4 The GCA determines whether the Add request sent by the GCA is successful according to the response of the MG. In the case of success, the GCA sends an Add response command to the MGC, and the context identifier is "Ca" to indicate the context allocated by the GCA, and the terminal identifier is " ⁇ indicates the temporary terminal added by the GCA in this context. At the same time, the GCA establishes a mapping between the context Ca and the context Cm, the terminal T1 and the terminal Tml.
  • step 5 the MGC sends an Add request command to the GCA, with the context identifier "Ca” indicating the target context, and the terminal identifier being "$" indicating that a temporary terminal is added in the context, and the IP domain identifier is "Realm2". The IP domain to which the temporary terminal is directed.
  • step 6 the GCA finds the MG in which the context Cm corresponding to the context Ca is located according to the request of the MGC, and sends an Add request command to the MG, and the context identifier is “Cm” to indicate the target context, and the terminal identifier is “$”.
  • the GCA finds the MG in which the context Cm corresponding to the context Ca is located according to the request of the MGC, and sends an Add request command to the MG, and the context identifier is “Cm” to indicate the target context, and the terminal identifier is “$”.
  • a temporary terminal is added, and the IP domain identifier "Realm2" indicates the IP domain to which the temporary terminal is directed.
  • step 7 The MG sends an Add response command to the GCA, with the context identifier "Cm” indicating the target context, and the terminal identifier "Tm2" indicating the temporary terminal added by the MG in the context.
  • step 8 the GCA determines whether the Add request sent by the GCA is successful according to the response of the MG. In the case of success, the GCA sends an Add response command to the MGC, and the context identifier is "Ca" to indicate the target context, and the terminal identifier is "T2". "Represents a temporary terminal that GCA adds in this context. GCA also establishes a mapping between T2 and Tm2.

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Description

一种网关控制代理及其实现方法 技术领域
本发明涉及网络中的网关控制代理（Gateway Control Agent, GCA)技术， 具体来说涉及一种基于 H.248协议的网关控制代理及其实现方法。
背景技术
媒体网关控制器（Media Gateway Controller, MGC)和媒体网关（Media Gateway, MG) 是分组网络中的两个关键构件。 MGC负责呼叫控制功能， MG负责业务承载功能，藉此来实现呼叫控制平面和业务承载平面的分离，从 而充分共享网络资源， 简化设备升级和业务扩展， 大大降低开发和维护成本。 图 1就是一种分组网络中的 MGC和 MG组网的示意图。
媒体网关控制协议是 MG和 MGC之间通信的主要协议， 目前应用较为广 泛的有称为 H.248/MeGaCo和 MGCP两种协议。 其中， MGCP协议由互联网工 程任务组（Internet Engineering Task Force, IETF)于 1999年 10月制订并于 2003 年 1月修订， H.248 MeGaCo协议由 IETF和国际电信联盟 （ International Telecommunications Union ITU)于 2000年 11月共同制订并于 2003年 6月修订。
以 H.248协议为例， MG上的各种资源被抽象表示为终端（Termination)。 终端又分为物理 （Physical) 终端和临时 （Ephemeral) 终端， 前者代表一些 具有半永久存在性的物理实体， 例如， 时分复用 （Time Division Multiplex, TDM)通道等， 后者代表一些临时申请用后释放的公共资源， 例如实时传输 协议（Real-time Transport Protocol, RTP)流等。 终端之间的组合被抽象表示 为上下文（Context)。 上下文可以包含多个终端， 因而以拓扑（Topology)来 描述终端间的相互关系。 基于协议的这种抽象模型， 呼叫的接续实际上就是 对终端和上下文的操作。
这种操作通过 MGC和 MG之间的命令 （Command)请求和响应来完成。 其中，命令类型包括添力 B(Add)、修改（Modify)、删减（Subtract)、移动（Move)、 审计值（AuditValue)、 审计能力 （AuditCapabilities)、 通报（Notify)、 服务 改变（ServiceChange)。 命令参数， 也称为描述符 （Descriptor), 被分类为属 性（Property)、 信号（Signal)、 事件（Event)、 统计（Statistic)。 具有业务相 关性的参数逻辑上聚合成为包 （Package
H.248协议的原始模型是面向 MGC-MG控制对的，也即 MGC了解 MG上的 资源状况并予以直接控制。 然而随着控制层面和承载层面的分离， 直接用 MGC来控制 MG就显得复杂和繁琐， 不便于分层控制和简化操作。
发明内容
本发明所要解决的技术问题在于， 为克服现有技术的不足， 而提供一种 网关控制代理及其实现方法， 其可使媒体网关控制器对媒体网关的控制简单 有效。
本发明所采用的技术方案在于， 提供了一种网关控制代理， 其设置在分 组网络的媒体网关控制器和多个媒体网关之间， 并可在媒体网关控制器和媒 体网关之间建立映射关系； 媒体网关控制器统一向网关控制代理请求可以提 供某种服务的资源能力， 网关控制代理在其下所管理的媒体网关中选取合适 的资源能力， 并在单个媒体网关域和网关控制代理所代表的媒体网关集合域 之间映射， 媒体网关控制器对网关控制代理所代表的媒体网关集合域中的资 源能力的控制操作被网关控制代理映射到单个媒体网关域中的资源能力上。
其中， 所述在媒体网关控制器与媒体网关之间建立的映射关系， 包括对 各种资源能力的映射。
其中， 网关控制代理代表媒体网关集合为媒体网关控制器的请求标识或 操作某种资源能力， 媒体网关代表自身为网关控制代理的请求标识或操作某 种资源能力， 网关控制代理可在由网关控制代理标识的资源能力与由媒体网 关标识的资源能力之间建立映射关系并在操作上相对应。
在网关控制代理与媒体网关之间可维护关于该媒体网关上的资源能力及 其状态的一一对应， 在媒体网关控制器与网关控制代理之间可维护关于媒体 网关集合中资源能力及其状态的一一对应， 所述网关控制代理在这两个层面 上的资源能力之间建立映射关系并在操作上对应。
其中， 所述网关控制代理还可在媒体网关控制器及媒体网关之间建立关 于资源能力的操作映射关系， 所述关于资源能力的操作包括资源能力的分配 和释放及各种组合、和 /或资源能力的特性修改和变动通报、和 /或资源能力的 状态维护和状态同步。 本发明还提供了一种网关控制代理实现方法， 包括： （a)、媒体网关统一 向设置在分组网络的媒体网关控制器和多个媒体网关之间的网关控制代理注 册， 而网关控制代理代表媒体网关集合向媒体网关控制器注册； （b)、 网关控 制代理根据媒体网关控制器发送来的服务提供请求选取合适的媒体网关， 并 向媒体网关发送请求提供该服务的命令； （c)、媒体网关向该网关控制代理发 送响应命令； （d)、 网关控制代理根据来自媒体网关的响应命令进行相应操作 并向媒体网关控制器发送响应命令， 同时， 该网关控制代理在媒体网关控制 器与媒体网关之间建立映射关系。
其中， 所述在媒体网关控制器与媒体网关之间建立映射关系， 包括建立 对终端的映射、 和 /或上下文的映射。
其中， 对上下文的映射， 包括： 网关控制代理代表媒体网关集合为媒体 网关控制器的请求分配和标识一个上下文； 媒体网关代表自身为网关控制代 理的请求分配和标识一个上下文； 网关控制代理在所述由网关控制代理分配 和标识的上下文与由媒体网关分配和标识的上下文之间建立映射关系并在操 作上对应。
其中， 所述对终端的映射包括对物理终端的映射及对临时终端的映射； 对物理终端的映射， 包括： 在网关控制代理与媒体网关之间将维护关于 该媒体网关上的物理终端及其状态的一一对应； 在媒体网关控制器与网关控 制代理之间将维护关于媒体网关集合中物理终端及其状态的一一对应； 网关 控制代理在这两个层面上的物理终端之间建立映射关系并在操作上对应； 对临时终端的映射， 包括： 在网关控制代理与媒体网关之间将由媒体网 关根据网关控制代理的请求分配或释放临时终端； 在媒体网关控制器与网关 控制代理之间将由网关控制代理根据媒体网关控制器的请求分配或释放临时 终端； 网关控制代理在这两个层面上的临时终端之间建立映射关系并在操作 上对应。
其中， 所述操作包括对终端、 上下文的操作， 该对终端、 上下文的操作 包括以下至少一种操作： 添加终端到上下文， 从上下文删减终端， 在上下文 间移动终端， 修改终端， 从终端发起通报， 审计终端， 以及上下文、 终端服 务改变。 其中， 进一步包括网关控制代理在媒体网关控制器及媒体网关之间建立 关于终端、 上下文的操作的映射关系。
本发明的有益效果在于， 由于本发明中釆用了一个网关控制代理， 使媒 体网关控制器把多个媒体网关视为一个资源集合， 而无需关心具体某个媒体 网关的细节， 这样可以实现分层控制并简化了操作。
附图说明
图 1是现有的一种分组网络中的媒体网关控制器 （MGC) 和媒体网关 (MG) 组网的示意图；
图 2是本发明中网关控制代理（GCA) 的原理示意图；
图 3是本发明中 MGC、 GCA、 MG基于 H.248协议的交互例程的示意图。 具体实施方式
本发明中所称的 GCA (网关控制代理） 是在原有的 MGC和 MG之间引入 的一个功能实体， 由其代理 MGC对 MG进行控制。 对 MGC而言， GCA代表着 其下所管理的所有 MG的集合， 其资源能力相当于其下所管理的 MG的资源能 力总和。 因此 MGC可以视 GCA如同 MG—样请求服务。 对 MG而言， GCA又 是 MGC的代表， 因此 MG统一向 GCA注册， 而 GCA代表 MG向 MGC注册， 这 里的注册机制采用 H.248现有注册机制。 只要有一个 MG向 GCA注册成功， GCA就具备能力向 MGC提供服务。
GCA的具体原理请参照图 2所示， GCA与 MGC之间关于 MG集合的资源能 力的理解是等同的， SP， GCA与 MGC之间关于 MG集合的资源能力在含义、 范围、 形式、 标识、 操作等方面是一致的。 GCA与 MG之间关于该 MG的资源 能力的理解是等同的， 即， GCA与 MG之间关于 MG的资源能力在含义、范围、 形式、 标识、 操作等方面是一致的。 GCA在这两种理解之间建立映射关系。 GCA将其下所管理的 MG的资源能力作为一个整体呈现给 MGC， MGC也就不 必关心某个资源能力具体是由哪个 MG提供的。 MGC统一向 GCA请求可以提 供某种服务的资源能力， GCA在其下所管理的 MG中选取满足该请求的资源 能力，并在单个 MG域和 GCA所代表的 MG集合域之间映射，这样 MGC对 GCA 所代表的 MG集合域中的资源能力的控制操作， 也就通过 GCA映射到单个 MG 域中的资源能力上。 GCA在 MGC的呼叫模型与 MG的呼叫模型之间建立各种资源能力的映射 关系， 包括终端、上下文等的映射。对于上下文而言， 其代表 MG上与某个呼 叫相关的终端的组合关系， 由 MGC向 MG请求并由 MG分配和标识，因此 GCA 代表 MG集合为 MGC的请求分配和标识一个上下文， MG代表自身为 GCA的请 求分配和标识一个上下文， GCA在这两个层面上的上下文之间建立映射关系 并在操作上对应。 对于物理终端而言， 其代表一些具有半永久存在性的物理 实体，例如 TDM通道等， 因此在 GCA与 MG之间将维护关于该 MG上的物理终 端及其状态的一一对应， 在 MGC与 GCA之间将维护关于 MG集合中物理终端 及其状态的一一对应， GCA在这两个层面上的物理终端之间建立映射关系并 在操作上对应。 对于临时终端而言， 其代表一些临时申请用后释放的公共资 源， 例如 RTP流等， 因此在 GCA与 MG之间将由 MG根据 GCA的请求分配或释 放临时终端， 在 MGC与 GCA之间将由 GCA根据 MGC的请求分配或释放临时 终端， GCA在这两个层面上的临时终端之间建立映射关系并在操作上对应。 相应地， GCA也在这两个层面上关于资源能力的 （如， 终端、 上下文等） 的 操作之间建立映射关系， 所述关于资源能力的操作包括资源能力的分配和释 放及各种组合、 资源能力的特性修改和变动通报、 资源能力的状态维护和状 态同步。 具体来说， 例如添加终端到上下文、 从上下文删减终端、 在上下文 间移动终端、 修改终端、 从终端发起通报、 审计终端或上下文、 终端服务改 变等。
具体来说，本发明的基于 H.248协议的网关控制代理实现方法包括这些基 本的步骤： 首先， 在分组网络的 MGC和多个 MG之间设置一个网关控制代理， 所述 MG统一向 GCA注册，而 GCA代表 MG向 MGC注册。当 MGC需要某个 MG 向其提供服务时， 则该 MGC向 GCA发送请求提供某种服务的命令； GCA根据 MGC的请求选取合适的 MG， 并向 MG发送请求提供该服务的命令； 该 MG向 该 GCA发送响应命令； GCA根据 MG的响应进行相应的操作， 该操作即为上 文中所提到的操作， 并向 MGC发送响应命令， 且该 GCA在 MGC与 MG之间建 立映射关系。 下面将举例来说明本发明的实现过程。
图 3示出了本发明中， MGC、 GCA, MG基于 H.248协议的交互例程的示 意图。 在该示意图中说明了创建包含两个临时终端 （分别针对不同 IP域） 的 上下文的过程：
在步骤一中： MGC向 GCA发送 Add请求命令， 以上下文标识为 "一"表 示请求 GCA分配一个上下文， 以终端标识为 "$"表示在该上下文中添加一个 临时终端， 以 IP域标识为 "Realml "表示该临时终端所针对的 IP域。
在步骤二中： GCA根据 MGC的请求选取合适的 MG， 并向该 MG发送 Add 请求命令， 以上下文标识为 "一"表示请求 MG分配一个上下文， 以终端标识 为 "$"表示在该上下文中添加一个临时终端， 以 IP域标识为 "Realml "表示 该临时终端所针对的 IP域。
在步骤三中： MG向 GCA发送 Add响应命令， 以上下文标识为 "Cm"表 示 MG所分配的上下文， 以终端标识为 "Tml "表示 MG在该上下文中添加的 临时终端。
在步骤四中： GCA根据 MG的响应判断 GCA发送的 Add请求是否成功，在 成功的情况下， 向 MGC发送 Add响应命令， 以上下文标识为 "Ca"表示 GCA 所分配的上下文， 以终端标识为 "Τ 表示 GCA在该上下文中添加的临时终 端。 同时， GCA在上下文 Ca与上下文 Cm、 终端 T1与终端 Tml之间建立映射。
在步骤五中： MGC向 GCA发送 Add请求命令， 以上下文标识为 " Ca"表 示目标上下文， 以终端标识为 " $ "表示在该上下文中添加一个临时终端， 以 IP域标识为 "Realm2"表示该临时终端所针对的 IP域。
在步骤六中： GCA根据 MGC的请求找到与上下文 Ca对应的上下文 Cm所 在的 MG， 并向该 MG发送 Add请求命令， 以上下文标识为 " Cm"表示目标上 下文， 以终端标识为 "$"表示在该上下文中添加一个临时终端， 以 IP域标识 为 "Realm2"表示该临时终端所针对的 IP域。
在步骤七中： MG向 GCA发送 Add响应命令， 以上下文标识为 "Cm"表 示目标上下文，以终端标识为 "Tm2"表示 MG在该上下文中添加的临时终端。
在步骤八中： GCA根据 MG的响应判断 GCA发送的 Add请求是否成功，在 成功的情况下， 并向 MGC发送 Add响应命令， 以上下文标识为 " Ca"表示目 标上下文，以终端标识为 "T2"表示 GCA在该上下文中添加的临时终端。 GCA 同时在 T2与 Tm2之间建立映射。
以上步骤中均省略了其它信息， 例如该临时终端的媒体参数等。

Claims

权利 要 求 书
1、一种网关控制代理， 其特征在于， 该网关控制代理设置在分组网络的 媒体网关控制器和多个媒体网关之间， 并在媒体网关控制器和媒体网关之间 建立映射关系； 媒体网关控制器统一向网关控制代理请求提供某种服务， 网 关控制代理在其下所管理的媒体网关中选取合适的资源能力， 并在单个媒体 网关域和网关控制代理所代表的媒体网关集合域之间映射， 媒体网关控制器 对网关控制代理所代表的媒体网关集合域中的资源能力的控制操作被网关控 制代理映射到单个媒体网关域中的资源能力上。
2、 如权利要求 1所述的网关控制代理， 其特征在于， 所述在媒体网关控 制器与媒体网关之间建立的映射关系， 包括对各种资源能力的映射。
3、 如权利要求 2所述的网关控制代理， 其特征在于， 网关控制代理代表 媒体网关集合为媒体网关控制器的请求标识或操作某种资源能力， 媒体网关 代表自身为网关控制代理的请求标识或操作某种资源能力， 网关控制代理可 在由网关控制代理标识的资源能力与由媒体网关标识的资源能力之间建立映 射关系并在操作上相对应。
4、 如权利要求 2所述的网关控制代理， 其特征在于， 在网关控制代理与 媒体网关之间维护关于该媒体网关上的资源能力及其状态的一一对应， 在媒 体网关控制器与网关控制代理之间维护关于媒体网关集合中资源能力及其状 态的一一对应， 所述网关控制代理在这两个层面上的资源能力之间建立映射 关系并在操作上对应。
5、如权利要求 1到 4任一项所述的网关控制代理， 其特征在于， 所述网关 控制代理进一步在媒体网关控制器及媒体网关之间建立关于资源能力的操作 的映射关系， 所述关于资源能力的操作包括资源能力的分配和释放及各种组 合、和 /或资源能力的特性修改和变动通报、和 /或资源能力的状态维护和状态 同步。
6、 一种网关控制代理实现方法， 其特征在于， 包括：
( a)、 媒体网关统一向设置在分组网络的媒体网关控制器和多个媒体网 关之间的网关控制代理注册， 而网关控制代理代表媒体网关集合向媒体网关 控制器注册；
( b )、 网关控制代理根据媒体网关控制器发送来的服务提供请求选取合 适的媒体网关， 并向该媒体网关发送请求提供该服务的命令；
(c)、 媒体网关向该网关控制代理发送响应命令；
( d )、 网关控制代理根据来自媒体网关的响应命令进行相应的操作并向 媒体网关控制器发送响应命令， 同时， 在媒体网关控制器与媒体网关之间建 立映射关系。
7、 如权利要求 6所述的网关控制代理实现方法， 其特征在于， 所述在媒 体网关控制器与媒体网关之间建立映射关系， 包括建立对终端的映射， 和 /或 对上下文的映射。
8、 如权利要求 7所述的网关控制代理实现方法， 其特征在于， 对上下文 的映射， 包括：
网关控制代理代表媒体网关集合为媒体网关控制器的请求分配和标识一 个上下文；
媒体网关代表自身为网关控制代理的请求分配和标识一个上下文； 网关控制代理在所述由网关控制代理分配和标识的上下文与由媒体网关 分配和标识的上下文之间建立映射关系并在操作上对应。
9、 如权利要求 7所述的网关控制代理实现方法， 其特征在于， 所述对终 端的映射包括对物理终端的映射， 以及对临时终端的映射；
对物理终端的映射， 包括：
在网关控制代理与媒体网关之间将维护关于该媒体网关上的物理终端及 其状态的一一对应；
在媒体网关控制器与网关控制代理之间将维护关于媒体网关集合中物理 终端及其状态的一一对应；
网关控制代理在这两个层面上的物理终端之间建立映射关系并在操作上 对应；
对临时终端的映射， 包括：
在网关控制代理与媒体网关之间将由媒体网关根据网关控制代理的请求 分配或释放临时终端； 在媒体网关控制器与网关控制代理之间将由网关控制代理根据媒体网关 控制器的请求分配或释放临时终端；
网关控制代理在这两个层面上的临时终端之间建立映射关系并在操作上 对应。
10、如权利要求 6到 9任一项所述的网关控制代理实现方法，其特征在于， 所述操作包括对终端、 上下文的操作， 该对终端、 上下文的操作包括以下至 少一种操作： 添加终端到上下文， 从上下文删减终端， 在上下文间移动终端， 修改终端， 从终端发起通报， 审计终端， 以及上下文、 终端服务改变。
11、 如权利要求 10所述的网关控制代理实现方法， 其特征在于， 进一步 包括网关控制代理在媒体网关控制器及媒体网关之间建立关于终端、 上下文 的操作的映射关系。
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