WO2006116933A1 - Procede, systeme et equipement de realisation d'une intercommunication entre les domaines ip - Google Patents

Procede, systeme et equipement de realisation d'une intercommunication entre les domaines ip Download PDF

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Publication number
WO2006116933A1
WO2006116933A1 PCT/CN2006/000863 CN2006000863W WO2006116933A1 WO 2006116933 A1 WO2006116933 A1 WO 2006116933A1 CN 2006000863 W CN2006000863 W CN 2006000863W WO 2006116933 A1 WO2006116933 A1 WO 2006116933A1
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WIPO (PCT)
Prior art keywords
domain
media stream
domain information
mgc
information
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PCT/CN2006/000863
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English (en)
French (fr)
Inventor
Yangbo Lin
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 JP2007530574A priority Critical patent/JP4937913B2/ja
Priority to AU2006243577A priority patent/AU2006243577B2/en
Priority to ES06741769.1T priority patent/ES2547460T3/es
Priority to US11/579,977 priority patent/US9525583B2/en
Priority to CA2570188A priority patent/CA2570188C/en
Priority to EP06741769.1A priority patent/EP1742436B1/en
Priority to BRPI0604840A priority patent/BRPI0604840B8/pt
Publication of WO2006116933A1 publication Critical patent/WO2006116933A1/zh
Priority to HK07101715.5A priority patent/HK1094512A1/zh
Priority to US15/354,628 priority patent/US9906489B2/en

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Classifications

    • 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
    • H04L61/00Network arrangements, protocols or services for addressing or naming
    • H04L61/09Mapping addresses
    • H04L61/25Mapping addresses of the same type
    • H04L61/2503Translation of Internet protocol [IP] addresses
    • H04L61/2521Translation architectures other than single NAT servers
    • H04L61/2528Translation at a proxy
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00Network arrangements, protocols or services for addressing or naming
    • 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
    • H04L65/1026Media gateways at the edge
    • 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
    • H04L65/1036Signalling gateways at the edge
    • 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
    • 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
    • H04L65/1066Session management
    • H04L65/1101Session protocols

Definitions

  • the present invention relates to the field of network communication technologies, and in particular, to a method, system and device for implementing interworking between IP (Internet Protocol) domains.
  • IP Internet Protocol
  • the networking structure of the NGN is shown in FIG. 1.
  • the MGC Media Gateway Controller
  • the MG Media Gateway
  • the MGC is responsible for the call control function
  • the MG is responsible for the service bearer function, thereby separating the call control plane and the service 7 -plane, thereby fully sharing network resources, simplifying equipment upgrades and service expansion, and greatly reducing development and maintenance costs.
  • the media gateway control protocol is the main protocol for communication between the MG and the MGC.
  • the applications include: H.248/MeGaCo (Gateway Control Protocol) and MGCP (Media Gateway Control Protocol). Gateway Control Protocol.
  • the MGCP protocol was formulated by the Internet Engineering Task Force (IETF) in October 1999 and revised in January 2003.
  • the H.248/MeGaCo protocol is composed of the IETF and the ITU (International Telecommunication Union). It was jointly developed in November 2000 and revised in June 2003.
  • Terminations various resource skins on the MG are abstractly represented as Terminations.
  • the terminal is further divided into physical terminals and temporary terminals.
  • the former represents some semi-permanent physical entities, such as TDM (Time Division Multiplex) channels, and the latter represents some public resources after temporary application, such as RTP (Real-time Transport Protocol) stream, etc.
  • RTP Real-time Transport Protocol
  • the combination between terminals is abstracted as a context.
  • the context may include a plurality of terminals, and thus the relationship between the terminals is described by Topology.
  • connection of the call is actually the operation of the terminal and the context.
  • the operation is done by a command (Command) request and response between the MGC and the MG.
  • the parameters carried by the command also called descriptors (Descriptor) are classified into categories such as Property, Signal, Event, and Statistic. Business relevance The parameters are logically aggregated into a package.
  • the context topology defined by itself is not sensitive to the terminal type. That is, the terminal constituting the context may be any physical terminal (e.g., TDM channel) or a temporary terminal (e.g., RTP stream).
  • the normal IP telephony service can be carried by a TDM physical terminal and an RTP temporary terminal.
  • the two TDM physical terminals can be interconnected for IP-IP interworking services. It can be carried by two RTP temporary terminal interconnections.
  • the original model of the H.248 protocol is oriented to the MGC-MG control relationship within a single IP domain.
  • the media stream is usually transmitted between the TDM physical terminal and the RTP temporary terminal on the ordinary MG.
  • each operator may need to implement inter-IP domain interworking.
  • the RTP streams of different IP domains need to be concatenated in the same context.
  • the relevant IP domain information needs to be known on the MG that creates the corresponding RTP stream, so as to determine Create the direction of the media stream. That is to say, if the corresponding IP domain information cannot be obtained on the corresponding MG, the corresponding RTP stream cannot be created at all.
  • an object of the present invention is to provide a method, system and apparatus for implementing inter-IP interworking, thereby enabling interworking of IP domains in a network based on a media gateway control protocol.
  • the present invention provides a method for implementing inter-IP interworking, including:
  • the media gateway between the IP domains The MG learns the IP domain information required to create the media stream through the message from the media gateway controller MGC.
  • the MG between the IP domains creates a corresponding media stream between the IP domains according to the IP domain information.
  • the step A includes: The MGC sends the D domain information of the IP domain to which the MG needs to be created to the MG, and the MG acquires the IP domain information.
  • the IP domain information required by the MGC to create a media stream by the MGC is specifically carried in the local control descriptor information and sent to the MG.
  • the bearer process in the step A1 includes: carrying the IP domain information in an extended attribute in the local control descriptor message; the extended attribute is directly defined or extended in the local control descriptor.
  • the package and its attribute definitions are: carrying the IP domain information in an extended attribute in the local control descriptor message; the extended attribute is directly defined or extended in the local control descriptor.
  • the method further includes:
  • the default value information of the IP domain information is configured on the MG.
  • step A includes:
  • the MGC instructs the MG to default to the IP domain information when creating the media stream
  • the MG determines the IP domain information required to create a media stream according to the IP domain information corresponding to the pre-configured default value.
  • the value of the IP domain information is a string.
  • the values of the IP domain information corresponding to the interoperable IP domains are different.
  • the method further includes: in the step A, when the MG cannot identify the IP domain information acquired from the MGC, the media stream fails to be created, and an error message is returned to the MGC; the step B is not performed.
  • the error information is an error code.
  • the present invention further provides a system for implementing inter-IP domain interworking, including an MG between an IP domain and an MGC of each IP domain.
  • the MG and the MGC both configure IP domain information of a neighboring IP domain involved in the MG. ;
  • the MGC is configured to send the IP domain information of the IP domain to which the media stream to be created belongs to the MG when the media stream needs to be created;
  • the MG is configured to create a corresponding media stream between the IP domains according to the IP domain information.
  • the IP domain information required by the MGC to create a media stream by the MGC is specifically carried in the local control descriptor information and sent to the MG.
  • the default value information of the IP domain information is also configured on the MG; the MG is indicated in the MGC.
  • the IP address information is created by default, the IP domain information required to create a media stream is determined according to the IP domain information corresponding to the pre-configured default value.
  • the present invention also provides an apparatus for implementing inter-IP domain interworking, configured with IP domain information of a neighboring IP domain involved therein; receiving an IP domain of an IP domain to which a media stream is to be created and a media stream to be created The information creates a corresponding media stream between the IP domains according to the IP domain information.
  • the present invention further provides an apparatus for implementing inter-IP domain interworking, and configuring adjacent IP domain information related to the MG between the IP domains associated with the IP domain; and when the media stream needs to be created, delivering the media stream to be created to the MG IP domain information of the IP domain to which it belongs.
  • the implementation of the present invention enables the MG between the IP domains that need to communicate with each other to obtain the IP domain to which the media stream (for example, the RTP media stream) that needs to be created belongs from the MGC.
  • the information ensures the interoperability between the domains that need to be interoperable, which provides great convenience for the operation and management of each network.
  • FIG. 1 is a schematic diagram showing the structure of a network of MG and MGC in an NGN;
  • FIG. 2 is a schematic structural diagram of an IP domain interworking networking in an NGN
  • Figure 3 is a flow chart of the method of the present invention.
  • FIG. 4 is a schematic diagram of a process of creating a media stream using the present invention.
  • the MGi 230 is set between the IP domain 210 and the IP domain IPb 220 that need to be interconnected.
  • the IPa 210 also includes MGCa 211 and MGa 212
  • the IPb 220 also includes MGCb 221 and MGb 222.
  • the MG (MGi) 230 which is set between the IP domains that need to communicate with each other, is called an IP inter-area interworking MG or an IP-IP MG (Inter-IP MG).
  • the difference from the ordinary MG (MGa 212 and MGb 222) is: It is in the UNI position, and the IP-IP MG is in the NI position. Accordingly, the media stream is also transmitted between the corresponding temporary terminals on the IP-IP MG.
  • the IP-IP MG In order to implement the interworking of the media stream across different IP domains, the IP-IP MG needs to know the IP domain information of the IP domain to which it belongs when creating a media stream. This is because different IP domains usually have different requirements for media streams. For example, different IP domains use different protocols (such as IPv4 and IPv6), so only by knowing the IP domain information can the media stream be correctly created.
  • IPv4 and IPv6 IPv4 and IPv6
  • the core idea of the invention By extending the local control descriptor of the H.248 protocol to support the IP domain information required by the bearer, the IP-IP MG can conveniently obtain the IP domain information to which the media stream needs to be created, so that Accurately create the appropriate media stream.
  • Step 31 The MGC determines that the IP domain information of the IP domain to which the media stream belongs is to be created when the media stream indication needs to be sent to the MG. ;
  • the media stream may be an RTP media stream, or any other media stream.
  • the MGC performs the call connection to create a media stream between the MGs.
  • a media stream indication needs to be sent to the MG.
  • the IP domain information (such as the IP domain ID), and the IP domain information configured on the MGC and the MG is the same.
  • the MGC determines that the media stream indication needs to be sent to the MG, the IP domain information of the IP domain to which the media stream belongs may be learned according to the configuration information.
  • Step 32 The MGC sends the IP domain information to the corresponding MG to notify the IP domain to which the media stream that needs to be created belongs.
  • the MGC may send the IP domain information to the MG in the local control descriptor, and the IP domain information may be sent to the MG in the extended attribute in the local control descriptor message, where the extension is sent. Attributes are defined directly in the local control descriptor, or defined by the extension package and its attributes;
  • the local control descriptor is a parameter that is sent by the MGC to the MG related to the media stream operation; the related message related to the media stream operation includes but is not limited to Add, Modify (Modify) and Move (Move) and other messages.
  • MGC instructs the MG to add a terminal to the context to create a media stream, usually with
  • Descriptors such as LocalControl, Local, and Remote describe the characteristics of the terminal to be added
  • Local describes the local end receiving (that is, the codec parameter of the peer sending body stream;
  • Remote describes the encoding and decoding parameters of the media stream received by the peer end (that is, the local end sends), such as an IP address port, Codec algorithm, packing duration, etc. These parameters are organized in the form of SDP (Session Description Protocol);
  • the LocalConatrol descriptor includes a Mode, a ReserveGroup, and a ReserveValue, and other stream-related attributes defined in the packet.
  • the Mode describes the media stream on the terminal. The status of the performance may be only sending, receiving, transmitting, deactivating, and looping; the ReserveGroup and ReserveValue describe whether the resources required for the media stream encoding and decoding on the terminal are reserved;
  • the present invention can extend a Realm (domain) attribute parameter in the LocalControl descriptor of the H.248 protocol, and is used to identify the IP domain to which the media stream carried by the terminal belongs.
  • the IP domain information attribute takes a string and can be in the form of a domain name, such as mynet.net.
  • an H.248 protocol packet and define an attribute in the packet that is the same as the Realm function, and is used to carry the corresponding IP domain information in the LocalControl descriptor and send it to the MG.
  • IP domain information (IP domain identifier) needs to be pre-agreed between the MGC and the MG.
  • IP domain identifier IP domain identifier
  • Different IP domains that may communicate with each other should have different IP domain identifiers.
  • the pre-agreed process can adopt a variety of specific means, so that the MGC and the MG can understand each other's meanings, and thus will not be described.
  • Step 33 After the MG obtains the IP domain information of the created media stream that is sent by the MGC, the MG creates a corresponding media stream according to the IP domain information.
  • the creation of the corresponding media stream according to the IP domain information includes determining the source address, the source port, the destination address, the destination port, the protocol type, and the like of the media stream according to the IP domain information, and details are not described herein.
  • the MG creates a media stream failure and returns a corresponding error code to the MGC.
  • the MG can also go to the MGC. Returns a successful response.
  • the default IP domain information can be pre-configured on the IP-IP MG.
  • the default IP domain information can be different from the normal IP domain information. If the MGC sends an indication for creating a media stream, the attribute defaults. , the MG considers to operate on the set default IP domain.
  • the IP domain to which the MG belongs can also be directly used as the default IP domain.
  • the interworking MGI 430 needs to create two media streams, namely RTPa and RTPb, when the MGC 440 instructs the MGi 430 to create.
  • the MGC may be either MGCa or MGCb depending on the specific circumstances, depending on which MGC control the MGi 430 belongs to. For example, it is subsequently controlled by the MGC that is registered with MGi.
  • the terminal 1 and the terminal 2 are interconnected, and the media streams RTPa and RTPb are successfully created, the interworking between the IP domain IPa 410 and the IP domain IPb 420 can be implemented through the MGi 430.
  • the MGi 230, the MGCa 211, and the MGCb 221 are all configured with corresponding IP domain information.
  • the MGCa 211 or the MGCb 221 transmits the required IP domain information to the MGi 230; the MGi 230 implements the creation of the media stream based on the IP domain information.
  • the implementation of the present invention enables interworking between IP domains that need to be interworking in the NGN, which provides greater convenience for network operations.

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

Description

实现 IP域间互通的方法、 系统及装置 技术领域 本发明涉及网络通信技术领域,尤其涉及一种实现 IP( Internet Protocol, 网际协议)域间互通的方法、 系统及装置。
背景技术
NGN ( Next Generation Network, 下一代网络)的组网结构如图 1所示, MGC ( Media Gateway Controller, 媒体网关控制器) 110 和 MG ( Media Gateway, 媒体网关) 121、 122是 NGN中的两个关键构件。 其中, MGC负 责呼叫控制功能, MG负责业务承载功能, 藉此实现呼叫控制平面和业务7 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。
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 广泛的包括: H.248/MeGaCo ( Gateway Control Protocol )和 MGCP ( Media Gateway Control Protocol, "媒体网关控制协议" ) 两种媒体网关控制协议。 其中, MGCP协议由 IETF ( Internet Engineering Task Force, 互联网工程任 务组 )于 1999年 10月制订并于 2003年 1月修订, H.248/MeGaCo协议由 IETF和 ITU( International Telecommunication Union,国际电信联盟 )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上的各种资源皮抽象表示为终端( Termination )。 终端又分为物理终端和临时终端,前者代表一些具有半永久存在性的物理实 体, 例如 TDM ( Time Division Multiplex, 时分复用)通道等, 后者代表一 些临时申请用后#放的公共资源, 例如 RTP ( Real-time Transport Protocol, 实时传输协议) 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, 因而以拓朴( 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。所述操作通过 MGC和 MG之间的命令( Command )请求和响应来完成。 命令所携带的参数, 也称为描述符(Descriptor ), 被划分为属性( Property )、 信号 ( Signal )、 事件 ( Event )、 统计(Statistic ) 等类别。 具有业务相关性 的参数逻辑上聚合成为包 ( Package )。
根据 H.248协议可知,其定义的上下文拓朴结构本身对终端类型并不敏 感。 即构成上下文的终端可以是任意物理终端(例如 TDM通道)或临时终 端 (例如 RTP流)。 就一个双向媒体流而言, 对于普通 IP电话业务可以由 一个 TDM物理终端和一个 RTP临时终端互联来 载, 对于局内 TDM电话 业务可以由两个 TDM物理终端互联来承载, 对于 IP-IP互通业务可以由两 个 RTP临时终端互联来承载。
H.248协议的原始模型是面向单 IP域内的 MGC-MG控制关系的。媒体 流在普通 MG上通常是在 TDM物理终端和 RTP临时终端之间传送的。 然 而,在实际应用中,各个运营商除了需要在各自的 IP域内实现 MG在 MGC 控制下的互通之外, 还可能需要彼此间实现跨 IP域的互通。
但是,在实现跨 IP域互通时需要将不同 IP域的 RTP流在同一上下文内 串联起来, 为实现这一目的则在创建相应的 RTP流的 MG上需要知晓相关 的 IP域信息, 以便于确定创建媒体流的方向。也就是说,如果在相应的 MG 上无法获取相应的 IP域信息, 则根本无法创建相应的 RTP流。 而目前还没 有一种技术手段可以使得在需要实现互通功能的 MG上能够获取创建 RTP 流所需的 IP域信息, 即目前在 MG上还无法获取创建 RTP流需要的 IP域 信息。
发明内容
鉴于上述现有技术所存在的问题, 本发明的目的是提供一种实现 IP域 间互通的方法、 系统及装置,从而可以实现基于媒体网关控制协议的网络中 的 IP域的互通。
本发明的目的是通过以下技术方案实现的:
本发明提供一种实现 IP域间互通的方法, 包括:
A、 IP域间的媒体网关 MG通过来自媒体网关控制器 MGC的消息获悉 创建媒体流需要的 IP域信息;
B、所述 IP域间的 MG根据所述的 IP域信息在 IP域间创建相应的媒体 流。
其中, 所述的步骤 A包括: Al、所述 MGC将 MG需要创建的媒体流所属 IP域的 D 域信息下发给 MG, MG获取所述的 IP域信息。
其中, 所述的步骤 A1 中, 所述 MGC下发 MG创建媒体流需要的 IP 域信息具体是将其承载于本端控制描述符信息中发送给 MG。
其中, 所述的步骤 A1 中的承载过程包括: 将所述的 IP域信息承载于 本端控制描述符消息中的扩展属性中;所述扩展属性在本端控制描述符中直 接定义或通过扩展包及其所含的属性定义。
其中, 该方法还包括:
在所述 MG上配置 IP域信息的缺省值信息。
其中, 所述的步骤 A包括:
MGC指示 MG创建媒体流时 IP域信息缺省;
MG根据预先配置的缺省值对应的 IP域信息确定创建媒体流需要的 IP 域信息。
其中, 所述的 IP域信息的取值为字符串。
其中, 在下一代网络 NGN中, 可互通的 IP域对应的 IP域信息的取值 各不相同。
其中, 该方法还包括: 所述步驟 A中, 当所述 MG无法识别从 MGC 获取的 IP域信息时, 则创建媒体流失败, 并向 MGC返回错误信息; 不执 行所述步骤 B。
其中, 所述的错误信息为错误码。
本发明还提供一种实现 IP域间互通的系统,包括 IP域间的 MG和各 IP 域的 MGC; 其特征在于, 所述 MG和 MGC均配置该 MG涉及的相邻 IP域 的 IP域信息;
所述 MGC用于在需要创建媒体流时,向所述 MG下发需创建的媒体流 所属 IP域的 IP域信息;
所述 MG用于根据所述的 IP域信息在 IP域间创建相应的媒体流。 其中, 所述 MGC下发 MG创建媒体流需要的 IP域信息具体是将其承 载于本端控制描述符信息中发送给 MG。
其中, 所述 MG上还配置 IP域信息的缺省值信息; 在 MGC指示 MG 创建媒体流时 IP域信息缺省的情况下根据预先配置的缺省值对应的 IP域信 息确定创建媒体流需要的 IP域信息。
本发明还提供一种实现 IP域间互通的装置, 配置有其所涉及的相邻 IP 域的 IP域信息; 在接收到创建媒体流的消息和所需创建的媒体流所属 IP域 的 IP域信息时根据所述的 IP域信息在 IP域间创建相应的媒体流。
本发明还提供一种实现 IP域间互通的装置, 配置与其关联的 IP域间的 MG涉及的相邻的 IP域信息; 在需要创建媒体流时, 向所述 MG下发需创 建的媒体流所属 IP域的 IP域信息。
由上述本发明提供的技术方案可以看出,本发明的实现使得在 NGN中, 需要互通的 IP域间的 MG可以从 MGC上获得需要其创建的媒体流(例如 RTP媒体流)所属的 IP域信息, 从而保证了需要互通的 Π>域间可以实现互 通, 为各个网络的运营管理提供了极大地方便。
附图说明 图 1为 NGN中 MG与 MGC组网结构示意图;
图 2为 NGN中 IP域互通组网结构示意图;
图 3为本发明所述的方法的流程图;
图 4为利用本发明进行媒体流创建的过程示意图。
具体实施方式
NGN中 IP跨域互通 MG组网示意图如图 2所示, 需要实现互通的 IP 域 IPa 210和 IP域 IPb 220之间设置有 MGi 230。 IPa 210中还包括 MGCa 211 和 MGa 212, IPb 220中还包括 MGCb 221和 MGb 222。 其中设置于需要互 通的 IP域间的 MG ( MGi ) 230称为 IP跨域互通 MG或 IP-IP MG ( IP域间 MG ), 与普通 MG ( MGa 212和 MGb 222 )的区别在于: 普通 MG处于 UNI 的位置, 而 IP-IP MG处于 N I的位置。 相应地媒体流在 IP-IP MG上也是 在相应的临时终端之间传送。
为了实现媒体流跨不同 IP域的互通,所述的 IP-IP MG在创建一个媒体 流时需要了解其所属 IP域的 IP域信息。 这是因为, 不同的 IP域中通常对 媒体流具有不同的要求,例如不同的 IP域中采用不同的协议 (如 IPv4和 IPv6 等), 因此只有了解 IP域信息, 才能正确地创建媒体流。 本发明的核心思想 是通过扩展 H.248协议的本端控制描述符, 以支持承载 ΓΡ-ΙΡ MG需要的 IP 域信息, 从而使得 IP-IP MG可以较为方便地获得需要创建的媒体流所属的 IP域信息, 以便于准确地创建相应的媒体流。
为对本发明有进一步的理解,下面将结合附图对本发明所述的方法的具 体实现方式做详细的说明。
本发明所述的方法在具体实现时如图 3所示, 具体包括以下过程: 步骤 31: MGC确定需要向 MG下发创建媒体流指示时,确定待创建的 媒体流所属 IP域的 IP域信息;
所述的媒体流可以为 RTP媒体流, 也可以为其他任何媒体流。
通常, MGC进行呼叫接续的目的就是要在 MG之间创建媒体流, 此时 需要向 MG下发创建媒体流指示。
对于不同的 IP域, 配置相应的 IP域信息 (如 IP域标识等), 且 MGC 和 MG上配置的 IP域信息相同。 在 MGC确定需要向 MG下发创建媒体流 指示时, 则可以根据配置信息获悉该媒体流所属 IP域的 IP域信息。
步骤 32: MGC将所述的 IP域信息发送给相应的 MG, 以通知其需要创 建的媒体流所属的 IP域;
MGC可以将所述的 IP域信息承载在本端控制描述符中发送给 MG,具 体可以将所述的 IP域信息承载于本端控制描述符消息中的扩展属性中发送 给 MG, 所述扩展属性在本端控制描述符中直接定义, 或通过扩展包及其所 含的属性定义;
本领域的技术人员理解,所述本端控制描述符是 MGC下发给 MG的涉 及媒体流操作的相关消息的参数;所述涉及媒体流操作的相关消息包括但不 限于 Add (添加)、 Modify (修改)和 Move (移动)等消息。
下面将对所述的本端控制描述符进行介绍:
MGC 指示 MG 添加终端到上下文中以创建媒体流时, 通常以
LocalControl (本端控制)、 Local (本端)和 Remote (对端)等描述符来描 述需要添加的终端的特征;
其中, Local描述本端接收 (也即对端发送 体流的编解码参数; Remote 描述对端接收(也即本端发送)媒体流的编解码参数, 例如 IP地址端口、 编解码算法、打包时长等,这些参数采用 SDP ( Session Description Protocol, 会话描述协议) 的形式来组织;
所述的 LocalConatrol描述符则包含 Mode (模式)、 ReserveGroup (预 留组)和 ReserveValue (预留值), 以及其它在包中定义的与流相关的属性; 其中, Mode描述该终端上媒体流对外表现的状态, 可以是只发、 只收、 收 发、去活、 环回; ReserveGroup和 ReserveValue描述该终端上媒体流编解码 所需资源是否预留;
因此,本发明可以在 H.248协议的 LocalControl描述符中扩展一个 Realm (域)属性参数, 用于标识该终端承载的媒体流所属的 IP域。 所述的 IP域 信息属性取值为一个字符串, 可以是域名的形式, 例如 mynet.net。
当然, 也可以扩展一个 H.248协议包并在该包中定义一个与 Realm功 能相同的属性, 用于在 LocalControl描述符中承载相应的 IP域信息发送给 MG。
如前所述, 所述的 IP域信息 ( IP域标识)需要在 MGC和 MG之间预 先协定, 可能互通的不同 IP域应具有不同的 IP域标识。 当然, 预先协定的 过程可以采用多种具体的手段,使得 MGC和 MG彼此理解含义即可, 此不 赘述。
步骤 33: MG获取由 MGC下发的创建的媒体流所属的 IP域信息后, 则根据所述的 IP域信息创建相应的媒体流。
本领域的技术人员理解, 所述根据 IP域信息创建相应的媒体流包括根 据该 IP域信息确定媒体流的源地址、 源端口、 目的地址、 目的端口、 协议 类型等, 此不赘述。
创建了相应的媒体流后, NGN网络中的 IP域间便实现了互通。
本领域的技术人员理解, 当 MG到不同 IP域的媒体流创建成功并经该 MG串接起来后, 在这些 IP域间便实现了互通。 所述串接的过程包括转发 以及必要的修改等, 此不赘述。
需要说明的是, 若 MGC下发的 IP域信息 MG无法识别 (例如超出了 前述在 MGC和 MG之间预先协定的范围), 则 MG创建媒体流失败并向 MGC返回相应的错误码。 当然, 在创建成功的情况下, MG也可以向 MGC 返回成功的响应。
同时, 在 IP-IP MG上还可以预先配置相应的缺省 IP域信息(缺省 IP 域信息与通常的 IP域信息可以没有区别), 若 MGC下发创建媒体流的指示 时该属性缺省, 则 MG认为是针对设置的缺省 IP域进行操作。
在单 IP域的场景下也可直接将 MG所属的 IP域作为该缺省 IP域。 本发明所述的方法在实际应用过程中, 如图 4所示, 以创建 RTP媒体 流为例,图中互通 MGi 430需要创建两个媒体流,即 RTPa和 RTPb,当 MGC 440指示 MGi 430创建 RTPa时, 则通过 LocalControl的 Realm=IPa.net (即 IP域信息) 下发给 MGi 430, 这样, MGi 430便可以获知需要创建的 RTPa 流所属的 IP域为 IPa.net, 并创建 RTPa;
本领域的技术人员理解, 根据具体情况, 该 MGC可以是 MGCa, 也可 以是 MGCb, 视该 MGi 430属于何 MGC控制而定。 例如, 由接受 MGi注 册的 MGC对其进行后续的控制。
同理, 还可以创建相应的 RTPb。
当在 MGi上建立了上下文使得终端 1和终端 2互联,并且媒体流 RTPa 和 RTPb创建成功后, 即可通过 MGi 430实现 IP域 IPa 410和 IP域 IPb 420 之间的互通。
请再次参阅图 2,本发明的实现 IP域间互通的系统中, MGi 230和 MGCa 211、 MGCb 221均配置相应的 IP域信息。 当需要 MGi 230创建媒体流时, MGCa 211或 MGCb 221向 MGi 230发送所需的 IP域信息; MGi 230根据 所述 IP域信息实现媒体流的创建。
综上所述,本发明的实现使得在 NGN中, 需要互通的 IP域间可以实现 互通, 为网络运营提供了更大的方便。
以上所述,仅为本发明较佳的具体实施方式,但本发明的保护范围并不 局限于此,任何熟悉本技术领域的技术人员在本发明揭露的技术范围内,可 轻易想到的变化或替换, 都应涵盖在本发明的保护范围之内。 因此, 本发明 的保护范围应该以权利要求的保护范围为准。

Claims

权 利 要 求
1、 一种实现 IP域间互通的方法, 其特征在于, 包括:
A、 IP域间的媒体网关 MG通过来自媒体网关控制器 MGC的消息获悉 创建媒体流需要的 IP域信息;
B、所述 IP域间的 MG根据所述的 IP域信息在 IP域间创建相应的媒体 流。
2、 根据权利要求 1所述的实现 IP域间互通的方法, 其特征在于, 所述 的步骤 A包括:
Al、所述 MGC将 MG需要创建的媒体流所属 IP域的 IP域信息下发给 MG, MG获取所述的 IP域信息。
3、 根据权利要求 2所述的实现 IP域间互通的方法, 其特征在于, 所述 的步骤 A1中,所述 MGC下发 MG创建媒体流需要的 IP域信息具体是将其 承载于本端控制描述符信息中发送给 MG。
4、 根据权利要求 3所述的实现 IP域间互通的方法, 其特征在于, 所述 的步骤 A1 中的承载过程包括: 将所述的 IP域信息承载于本端控制描述符 消息中的扩展属性中;所述扩展属性在本端控制描述符中直接定义或通过扩 展包及其所含的属性定义。
5、根据权利要求 1所述的实现 IP域间互通的方法, 其特征在于, 还包 括:
在所述 MG上配置 IP域信息的缺省值信息。
6、根据权利要求 5所述的实现 IP域间互通的方法, 其特征在于, 所述 的步骤 A包括:
MGC指示 MG创建媒体流时 IP域信息缺省;
MG根据预先配置的缺省值对应的 IP域信息确定创建媒体流需要的 IP 域信息。
7、根据权利要求 1至 6任一项所述的实现 IP域间互通的方法, 其特征 在于, 所述的 IP域信息的取值为字符串。
8、根据权利要求 1至 6任一项所述的实现 IP域间互通的方法, 其特征 在于, 在下一代网络 NGN中, 可互通的 IP域对应的 IP域信息的取值各不 相同。
9、根据权利要求 1至 6任一项所述的实现 IP域间互通的方法, 其特征 在于, 还包括: 所述步骤 A中, 当所述 MG无法识别从 MGC获取的 IP域 信息时, 则创建媒体流失败,并向 MGC返回错误信息; 不执行所述步骤^
10、 根据权利要求 9所述的实现 IP域间互通的方法, 其特征在于, 所 述的错误信息为错误码。
11、一种实现 IP域间互通的系统,包括 IP域间的 MG和各 IP域的 MGC; 其特征在于,所述 MG和 MGC均配置该 MG涉及的相邻 IP域的 IP域信息; 所述 MGC用于在需要创建媒体流时,向所述 MG下发需创建的媒体流 所属 IP域的 IP域信息;
所述 MG用于根据所述的 IP域信息在 IP域间创建相应的媒体流。
12、 根据权利要求 11所述的实现 IP域间互通的系统, 其特征在于, 所 述 MGC下发 MG创建媒体流需要的 IP域信息具体是将其承载于本端控制 描述符信息中发送给 MG。
13、 根据权利要求 11所述的实现 IP域间互通的方法, 其特征在于, 所 述 MG上还配置 IP域信息的缺省值信息; 在 MGC指示 MG创建媒体流时 IP域信息缺省的情况下根据预先配置的缺省值对应的 IP域信息确定创建媒 体流需要的 IP域信息。
14、 一种实现 IP域间互通的装置, 其特征在于, 配置有其所涉及的相 邻 IP域的 IP域信息; 在接收到创建媒体流的消息和所需创建的媒体流所属
IP域的 IP域信息时根据所述的 IP域信息在 IP域间创建相应的媒体流。
15、 一种实现 IP域间互通的装置, 其特征在于, 配置与其关联的 IP域 间的 MG涉及的相邻的 IP域信息; 在需要创建媒体流时, 向所述 MG下发 需创建的媒体流所属 IP域的 IP域信息。
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JP2008512906A (ja) 2008-04-24
JP5465260B2 (ja) 2014-04-09
CN1855896A (zh) 2006-11-01
US20080159518A1 (en) 2008-07-03
US9525583B2 (en) 2016-12-20
EP1742436A1 (en) 2007-01-10
CN100399773C (zh) 2008-07-02
BRPI0604840B1 (pt) 2018-12-26
US20170070477A1 (en) 2017-03-09
BRPI0604840A2 (pt) 2009-05-26
CA2570188C (en) 2017-01-03
EP3151501B1 (en) 2018-06-13
KR20070067013A (ko) 2007-06-27
EP2913971A1 (en) 2015-09-02
AU2006243577A1 (en) 2006-11-09
EP1742436A4 (en) 2007-06-06
US9906489B2 (en) 2018-02-27
JP2012085356A (ja) 2012-04-26
AU2006243577B2 (en) 2009-05-21
EP2913971B1 (en) 2016-12-28
CA2570188A1 (en) 2006-11-09
ES2619360T3 (es) 2017-06-26
EP3151501A1 (en) 2017-04-05
JP4937913B2 (ja) 2012-05-23
ES2686996T3 (es) 2018-10-23
BRPI0604840B8 (pt) 2019-01-15
ES2547460T3 (es) 2015-10-06
EP1742436B1 (en) 2015-07-08
HK1094512A1 (zh) 2007-03-30

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