WO2009082903A1 - Procédé destiné à régler la vitesse d'un signal, passerelle multimédia et contrôleur de passerelle multimédia - Google Patents

Procédé destiné à régler la vitesse d'un signal, passerelle multimédia et contrôleur de passerelle multimédia Download PDF

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Publication number
WO2009082903A1
WO2009082903A1 PCT/CN2008/072822 CN2008072822W WO2009082903A1 WO 2009082903 A1 WO2009082903 A1 WO 2009082903A1 CN 2008072822 W CN2008072822 W CN 2008072822W WO 2009082903 A1 WO2009082903 A1 WO 2009082903A1
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WIPO (PCT)
Prior art keywords
signal
speed
media gateway
adjusting
adjustment information
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Application number
PCT/CN2008/072822
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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 EP08866995A priority Critical patent/EP2214361B1/en
Publication of WO2009082903A1 publication Critical patent/WO2009082903A1/zh
Priority to US12/796,072 priority patent/US8488454B2/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
    • H04L65/00Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10Architectures or entities
    • H04L65/102Gateways
    • H04L65/1023Media 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
    • H04L65/1043Gateway controllers, e.g. media gateway control protocol [MGCP] controllers

Definitions

  • the present invention relates to the field of communications, and in particular, to a method for adjusting signal speed, a media gateway, and a media gateway controller.
  • MGC Media Gateway Control
  • P MG Media Gateway
  • the networking diagram of the MGC and the MC is the main protocol for communication between the MG and the MGC.
  • H.248/MeGaCo Gateway Control Protocol
  • MGCP Media Gateway Control Protocol
  • H.248/MeGaCo is based on the development of MGCP.
  • the various resources on the MG are abstractly represented as Terminations.
  • the terminal is further divided into physical terminals and temporary (Ephemeral) terminals.
  • the physical terminals represent some physical entities with semi-permanent existence, such as TDM (Time Division Mulipex) time slots, etc.; temporary terminals represent some temporary applications. Released public resources, such as RTP streams.
  • there is a root terminal which represents the MG as a whole.
  • the association between terminals is abstracted as a context.
  • the context can contain multiple terminals, so the topology is used to describe the interrelationship between the terminals. For a terminal that has not been associated with another terminal, it is included by a special context called a null (Null) context.
  • the MGC instructs the MG to perform certain resource operations, such as playing, recording, etc., by means of a signal.
  • the signal is executed at the terminal or stream level, and execution on the terminal indicates that it is applicable to all streams on the terminal.
  • a list of signals can be used to represent a series of operations that need to be performed in sequence, with gaps between operations.
  • the MGC includes a list of signals and/or signals in the signal descriptor and sends it to the MG. The list of signals and/or signals in the signal descriptors issued at the same time is synchronized.
  • the execution time of the signal on the MG is performed according to the preset setting, and the actual setting may need to adjust the preset setting.
  • only the speed adjustment may be applied to the playback signal, for example, a piece of configured media is in accordance with the lack of The playback speed of the province will last for 30 seconds, but during the playback of the media, it may be hoped that the media will be slowed down for more than 45 seconds or rewinded to the beginning within 15 seconds, that is, with respect to the default speed.
  • the adjustment speed is played in both directions.
  • the inventors have found that the above prior art has at least the following disadvantages:
  • the execution time of the signal on the MG can only be performed according to a preset setting, when the signal is executed,
  • the MGC cannot adjust the speed of signals other than the playback signal and cannot meet the needs of immediate adjustment.
  • the embodiment of the present invention provides a method for adjusting signal speed, a media gateway, and a media gateway controller.
  • the technical solution is as follows:
  • an embodiment of the present invention provides a method for adjusting a signal speed, where the method includes:
  • an embodiment of the present invention further provides a media gateway, where the media gateway includes:
  • a receiving module configured to receive a command request sent by the media gateway controller, where the command request includes signal speed adjustment information
  • an adjustment module configured to adjust a signal speed according to the signal speed adjustment information included in the command request received by the receiving module.
  • the embodiment of the present invention further provides a media gateway controller, where the media gateway controller includes: a sending module, configured to send a command request to the media gateway, where the command request includes signal speed adjustment information.
  • the MGC when the signal speed is adjusted, the MGC sends a command request including the signal speed adjustment information to the MC, and after receiving the command, the MC adjusts the signal speed according to the signal speed adjustment information, so as to achieve the purpose of adjusting the arbitrary signal speed in real time. . DRAWINGS
  • FIG. 1 is a schematic diagram of networking of MGC and MC in the prior art
  • FIG. 2 is a flowchart of a method for adjusting a signal speed according to Embodiment 1 of the present invention
  • FIG. 3 is a flow chart of a method for adjusting a signal speed according to Embodiment 2 of the present invention.
  • FIG. 4 is a schematic structural diagram of a media gateway according to Embodiment 3 of the present invention.
  • FIG. 5 is a schematic structural diagram of a media gateway controller according to Embodiment 4 of the present invention. detailed description
  • the MGC can flexibly select the timing as needed, and perform speed adjustment on any signal on the MG, such as playing, recording, and the like.
  • Embodiments of the present invention provide a method for adjusting a signal speed, including:
  • the media gateway receives a command request sent by the media gateway controller, where the command request includes signal speed adjustment information; and the media gateway adjusts the signal speed according to the signal speed adjustment information.
  • the Media Gateway Control Protocol is the main protocol for communication between MG and MGC.
  • H.248/MeGaCo and MGCP are two protocols. Taking H.248 as an example, in the abstract connection model between services and bearers, the interaction between services and bearers is actually the operation of the terminal and context. This operation is done by a request (Request) and a response (Reply) between the MGC and the MG.
  • the command types include Add, Modify, Subtract, Move, AuditValue, AuditCapabilities, Notify, and ServiceChange. Wait.
  • Command parameters are also called Descriptors, including Property signals, Events, and Statistics. In order to facilitate the logical aggregation of parameters with business relevance into a package.
  • the media gateway control protocol is first extended, and a relative speed signal is introduced in the media gateway control protocol, and the relative speed signal and its parameters are used to represent the signal speed adjustment information, where the relative speed signal indicates that the MGC adjusts the speed of the signal request relative to The ratio of regular speed.
  • the relative speed signal is used to indicate the relative speed.
  • the signal can be named RS (Relative Speed).
  • the RS signal can be defined in an existing package or a new package. If it is defined in a new package, the new signal can be used.
  • the package is named SRSA (Signal Relative Speed Adjustment) package.
  • the RS signal is an independent signal.
  • the MGC needs to adjust the speed of a signal on a terminal or stream, the MGC does not need to reset the signal to be adjusted, but sends a signal description to the terminal or stream.
  • the RS signal is included in the symbol to perform signal speed adjustment on the terminal or stream.
  • the RS signal may include the ratio of the speed at which the MGC adjusts the signal request to the normal speed, expressed by a Scale parameter, which may be positive or negative, with positive values indicating positive and negative values. Reverse.
  • the type of Scale can be a string, a float, or an integer. For example, when the type is a string or a floating point, you can define a value of 1 to indicate that the forward direction is equal to the normal speed, and a value of 2 to indicate that the forward direction is twice the normal speed, -1.5.
  • the reverse is one and a half times the normal speed; when the type is an integer, you can define the value as a percentage, the value 100 means the forward is equal to the normal speed, and 200 means the forward double At normal speeds, 50 means that the forward half is at the normal speed, -150 means the reverse is one and a half times the normal speed, and 0 can be defined to mean a pause or as meaningless.
  • the RS signal can also contain any combination of the following parameters:
  • SI Signal Identifier
  • the type is a string.
  • the format can be in the form of "packet identification/signal identification”. The purpose of adjusting the speed of a single signal can be achieved by setting SI. ;
  • SLI Signal List Identifier
  • the Media Resource Identifier indicates the media resource to be adjusted, and the type is a string.
  • the URL Uniform Resource Identifier or the Internationalized Resource Identifier (IRI) may be used. When multiple instances of the same signal exist on a terminal or stream, they can be distinguished by the media resource identification.
  • an embodiment of the present invention provides a method for adjusting a signal speed, which specifically includes:
  • the MGC When the MGC needs to adjust the speed of a certain signal, the MGC sends a command request to the corresponding terminal or stream on the MG, and the command request includes an RS signal.
  • the MGC can request an RS signal to be sent to the MG through an Add, Modify, Move, or Subtract command.
  • the RS signal includes the Scale parameter, which is the ratio of the speed of the request adjustment to the normal speed.
  • the default can be defined as maintaining the current speed.
  • the RS signal may also include any combination of parameters such as SI, SLI, MRI, etc., and the combined meanings thereof are as follows:
  • the MG adjusts the list of all signals and/or signals on the terminal or stream after receiving the command request;
  • the MG adjusts the signal corresponding to the SI and/or the signal list corresponding to the SLI on the terminal or the stream;
  • the MG adjusts the list of all signals and/or signals related to the media resource corresponding to the MRI on the terminal or the stream;
  • the MG adjusts the signal corresponding to the SI related to the media resource corresponding to the MRI on the terminal or the stream. / or a list of signals corresponding to the SLI.
  • the MGC may send a signal and/or a signal list for the RS signal while the MGC sends the RS signal, or preset the MG to adjust the signal.
  • the list of signals and/or signals is automatically retained by the list of signals and/or signals.
  • the MG receives the command request sent by the MGC, and adjusts the RS signal according to the parameter of the RS signal in the command request. The speed of the signal/signal list for which the number is directed.
  • the MG adjusts the speed of the signal according to the parameters of the RS signal
  • the RS signal only includes the Scale parameter, that is, only the ratio of the speed of the MGC to the signal request adjustment relative to the normal speed is included
  • the MG adjusts the terminal to which the command request is based on the Scale parameter. Or the speed at which all signals and/or signal lists are streamed; when the RS signal further includes parameters such as SI, SLI or MRI, or any combination thereof, the MC adjusts parameters such as SI, SLI or MRI according to the Scale parameter or any combination thereof.
  • the corresponding signal speed the specific process is as follows:
  • the MG adjusts the speed of all signals and/or signal lists on the terminal or stream according to the Scale parameter after receiving the command request;
  • the MG adjusts the signal corresponding to the SI and/or the signal corresponding to the S1 according to the Scale parameter according to the Scale parameter. speed;
  • the MG adjusts the speed of all the signals and/or signal lists related to the media resource corresponding to the MRI according to the Scale parameter according to the Scale parameter;
  • the MG receives the command request, and adjusts, according to the Scale parameter, the media resource corresponding to the MRI corresponding to the media resource corresponding to the MRI according to the Scale parameter.
  • the MG may further include:
  • the MG determines whether the parameters such as SI, SLI, or MRI included in the RS signal sent by the MGC, or any combination thereof, match the signal and/or signal list on the terminal or the stream for which the command request is directed, and if so, according to the RS
  • the signal and its parameter information adjust the speed of the corresponding signal; otherwise, the adjustment execution error message is returned to the MGC. For example, if the signal corresponding to the SI and/or SLI does not exist or has been completed on the terminal or stream, then the MG returns an error response to the MGC, such as error code 473 (representing the value of the contradictory characteristic).
  • the MG After adjusting the speed of the corresponding signal, the MG returns a command response to the MGC.
  • the RS signal In the command response returned by the MG to the MGC, the RS signal is included, and the RS signal includes a Scale parameter, which is a ratio of the actual speed of the signal after adjustment to the normal speed. The default may be defined as the adjustment using the requested proportion.
  • the MG reports the speed to which the signal is actually adjusted to the MGC. In the actual application, the MG may not adjust the signal speed strictly according to the ratio requested by the MGC.
  • the scale parameter of the command request sent by the MGC is 2, It indicates that the speed of a signal is adjusted to be twice the normal speed, and the speed of the signal after the MG adjustment may be 1.8 times that of the normal speed. In this case, the GT sends a command response to the MGC with a value of 1.8.
  • the MG may not return a command response to the MGC, ie, may omit 103, or at least not include the RS signal and its Scale parameter in the command response returned to the MGC.
  • the unified Scale parameter is used, but only the command parameter and the command response are in the Scale parameter.
  • Different meanings can be used to replace the above method by defining an independent parameter for the uplink and the downlink respectively.
  • the RS (Requested Scale) parameter and the AS (Actual Scale) are respectively defined.
  • the parameter, RS is the ratio of the MGC to the MG, which indicates the ratio of the speed at which the MGC adjusts the signal request to the normal speed;
  • AS is the ratio reported by the MG to the MGC, indicating the ratio of the actual speed of the signal after adjustment to the normal speed.
  • the types and values of the RS and AS are the same as the above Scale parameters, and are not described here.
  • the command may include the foregoing RS parameter in the command request that the MGC sends to the MG, including the RS signal, and the default may be defined as maintaining the current speed; when the MGC wants the MG to return the signal adjustment.
  • the RS signal may also include the above AS parameter, but its value is "select" the wildcard "$", indicating that the MGC wants the MG to return the adjusted actual speed; the return of the MG to the MGC in 103
  • the RS signal may also include the above AS parameters, and the default may be defined to adopt the requested ratio.
  • an RS signal is introduced in the media gateway control protocol, so that the MGC can flexibly adjust the speed of any signal according to requirements, and since the RS signal is an independent signal, real-time adjustment of the signal speed can be realized, and the implementation is simple. Efficient.
  • the media gateway control protocol is first extended, and a relative speed ratio attribute is introduced in the media gateway control protocol, and the signal speed adjustment information is represented by an attribute, and the relative speed ratio attribute indicates a ratio of the adjustment speed of the signal to the normal speed.
  • RSS Relative Speed Scale
  • SRSA Synchronization Relative Speed Adjustment
  • this attribute is the same as that of the Scale parameter in the first embodiment.
  • the type and value of the attribute are also readable and writable.
  • the embodiment provides a method for adjusting a signal speed, which specifically includes:
  • the MGC When the MGC needs to adjust the speed of the terminal or the signal on the MG, the MGC sends a command request to the MG, where the request includes the RSS attribute, and the MGC sends the MG to the MG to adjust the speed of the signal request.
  • the ratio of speed When the MGC needs to adjust the speed of the terminal or the signal on the MG, the MGC sends a command request to the MG, where the request includes the RSS attribute, and the MGC sends the MG to the MG to adjust the speed of the signal request. The ratio of speed.
  • the MG After receiving the foregoing command request sent by the MGC, the MG adjusts the speed of all signals on the terminal or the stream on the MG according to the RSS attribute included in the command request.
  • the MG After adjusting the speed of the signal, the MG returns a corresponding command response to the MGC.
  • the command response returned by the MG to the MGC also includes an RSS attribute, by which the MG reports to the MGC the ratio of the adjusted actual speed to the normal speed.
  • the MG may not return a command response to the MGC, i.e., 203 may be omitted, or at least not included in the command response returned to the MGC.
  • the MGC by introducing the RSS attribute in the media gateway control protocol, when the MGC needs to adjust the speed of all the signals on a certain terminal or the stream on the MG, the MGC sends a command request including the attribute to the MG, so that any signal can be obtained.
  • the purpose of speed adjustment is to meet the needs of real-time adjustment, and it is simple and efficient.
  • an embodiment of the present invention provides a media gateway, where the media gateway includes:
  • the receiving module 301 is configured to receive a command request sent by the media gateway controller, where the command request includes signal speed adjustment information;
  • the adjusting module 302 is configured to adjust the signal speed according to the signal speed adjustment information included in the command request received by the receiving module 301.
  • the foregoing media gateway may further include:
  • the sending module 303 is configured to return a command response to the media gateway controller, where the command response includes adjustment execution error information or signal speed adjustment information, where the signal speed adjustment information includes a ratio of the actual speed of the media gateway adjusted by the media gateway to the normal speed. .
  • the adjustment module 302 performs speed adjustment on a certain group or a group of signals on the MC according to the signal speed adjustment information in the command request received by the receiving module 301, and can adjust the speed of any signal, which avoids the prior art.
  • the problem of speed adjustment of the playback signal is only simple and convenient.
  • an embodiment of the present invention provides a media gateway controller, where the media gateway controller includes: a sending module 401, configured to send a command request to a media gateway, where the command request includes signal speed adjustment information.
  • the sending module 401 may be further configured to send a command request to the media gateway, where the request includes an adjustment The signal of speed.
  • the foregoing media gateway controller may further include:
  • the receiving module 402 is configured to receive a command response returned by the media gateway, where the command response includes an adjustment execution error information or signal speed adjustment information, where the signal speed adjustment information includes a ratio of the actual speed of the media gateway adjusted by the media gateway to the normal speed.
  • the command request including the signal speed adjustment information is sent to the media gateway by the sending module 401, so that the speed adjustment of any signal can be realized, and the implementation is simple.
  • the embodiments of the present invention can be implemented by software, and the corresponding software can be stored in a readable storage medium, for example, a hard disk, a floppy disk or an optical disk of a computer.
  • a readable storage medium for example, a hard disk, a floppy disk or an optical disk of a computer.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Description

调整信号速度的方法、 媒体网关和媒体网关控制器 技术领域
本发明涉及通信领域, 特别涉及一种调整信号速度的方法、 媒体网关和媒体网关控制 器。 说
背景技术
MGC (Media Gateway Control, 媒体网关控制器)禾 P MG (Media Gateway, 媒体网关) 是业务与承载分离架构下的分组网络的两个关键构件。 MGC负责业务控制功能, MG负责 媒体承载功能, 藉此实现业务控制平面和媒体承载平面的分离, 从而充分共享网络资源, 书
简化设备升级和业务扩展, 降低开发和维护成本。
参见图 1, 为 MGC和 MC的组网示意图, 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 H.248/MeGaCo ( Gateway Control Protocol, 网关控制 协议) 禾 P MGCP ( Media Gateway Control Protocol , 媒体网关控制协议) 两种协议, 且 H.248/MeGaCo是基于 MGCP发展而来的。
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,物理终端代表一些具有半永久存在性的物理实体,例如 TDM( Time Division Mulipex, 时分复用) 时隙等; 临时终端代表一些临时申请后释放的公共资源, 例 如 RTP流等。 另外, 还有根 (Root) 终端, 它代表 MG整体。 终端之间的关联被抽象表示 为上下文 (Context)。 上下文可以包含多个终端, 因此以拓扑 (Topology) 来描述终端间的 相互关系。 对于还未与其它终端发生关联的终端, 由一个被称为空(Null )上下文的特殊上 下文来包含。
现有技术中, MGC通过信号 (Signal ) 指示 MG进行某种资源操作, 例如播放、 录制 等。 信号在终端或流(Stream)级执行, 在终端上执行表示对该终端上的所有流都适用。 可 以采用信号列表的方式来表示一系列需要按序进行的操作, 在各个操作之间可以有间隔。 MGC将信号和 /或信号列表包含在信号描述符中下发给 MG。在同一次下发的信号描述符中 的信号和 /或信号列表被同步进行。
信号在 MG上的执行时间是按照预先的设置来进行的, 而实际应用中可能需要调整这 种预先设置, 现有技术中只能对播放信号应用速度调整, 例如, 一段配置好的媒体按照缺 省的播放速度将要持续 30秒, 但是在该媒体的播放过程中, 可能希望该媒体持续 45秒以 上被慢放或者在 15秒之内被快退到开头, 即以相对于缺省速度的某种调整速度双向播放。
综上所述, 在实现本发明的过程中, 发明人发现上述现有技术至少存在以下缺点: 现有技术中信号在 MG上的执行时间只能按照预先的设置来进行,在信号执行时, MGC 不能对除播放信号以外的信号进行速度调整, 不能满足即时调整的需求。 发明内容
为了使 MGC能够对任意信号进行速度调整,本发明实施例提供了一种调整信号速度的 方法、 媒体网关和媒体网关控制器。 所述技术方案如下:
一方面, 本发明实施例提供了一种调整信号速度的方法, 所述方法包括:
接收媒体网关控制器下发的命令请求, 所述命令请求中包含信号速度调整信息; 根据所述信号速度调整信息调整信号速度。
另一方面, 本发明实施例还提供了一种媒体网关, 所述媒体网关包括:
接收模块, 用于接收媒体网关控制器下发的命令请求, 所述命令请求中包含信号速度 调整信息;
调整模块, 用于根据所述接收模块接收的命令请求中包含的信号速度调整信息调整信 号速度。
另一方面, 本发明实施例还提供了一种媒体网关控制器, 所述媒体网关控制器包括: 发送模块, 用于向媒体网关下发命令请求, 所述命令请求中包含信号速度调整信息。 本发明实施例提供的技术方案的有益效果是:
本发明实施例在调整信号速度时,通过 MGC向 MC下发包含信号速度调整信息的命令 请求, MC收到该命令请求后根据信号速度调整信息调整信号速度, 可以达到实时调整任意 信号速度的目的。 附图说明
图 1是现有技术中 MGC和 MC的组网示意图;
图 2是本发明实施例 1提供的调整信号速度的方法的流程图;
图 3是本发明实施例 2提供的调整信号速度的方法的流程图;
图 4是本发明实施例 3提供的媒体网关的结构示意图;
图 5是本发明实施例 4提供的媒体网关控制器的结构示意图。 具体实施方式
为使本发明的目的、 技术方案和优点更加清楚, 下面将结合附图对本发明实施方式作 进一步地详细描述。
本发明实施例通过在扩展媒体网关控制协议, 使得 MGC可以按照需要灵活地选择时 机, 对 MG上的任意信号, 例如播放、 录音信号等, 进行速度调整。
本发明实施例提供了一种调整信号速度的方法, 包括:
媒体网关接收媒体网关控制器下发的命令请求, 该命令请求中包含信号速度调整信息; 媒体网关根据上述信号速度调整信息调整信号速度。
实施例 1
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
H.248/MeGaCo和 MGCP两种协议, 以 H.248为例, 在业务与承载之间的抽象连接模型中, 业务与承载之间的交互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 命令的请求(Request)和响应(Reply)来完成。其中,命令类型包括增力口(Add)、修改(Modify)、 删减 (Subtract)、 移动 (Move)、 审计值 ( AuditValue)、 审计能力 ( AuditCapabilities)、 通 报 (Notify) 和服务改变 (ServiceChange) 等。 命令参数也称为描述符 (Descriptor) , 包括 属性 ( Property ) 信号 ( Signal ) 事件 (Event) 和统计 ( Statistic) 等。 为了方便将具有业 务相关性的参数从逻辑上聚合为包 (Package)。
本实施例首先扩展媒体网关控制协议, 在媒体网关控制协议中引进相对速度信号, 通 过该相对速度信号及其参数来表示信号速度调整信息,该相对速度信号表示 MGC对信号请 求调整的速度相对于常规速度的比例。
上述相对速度信号用来表示相对速度, 例如可以将该信号命名为 RS (Relative Speed, 相对速度), RS 信号可以定义在现有包或新包中, 如果定义在新包中, 可以将该新包命名 为 SRSA ( Signal Relative Speed Adjustment, 信号相对速度调整) 包。
RS信号是一个独立的信号, 当 MGC需要对某个终端或流上的信号进行速度调整时, MGC不需要对要调整速度的信号进行重新设置, 而是在下发给该终端或流的信号描述符中 包含该 RS信号, 就可以在该终端或流上执行信号速度调整。
RS信号可以包含 MGC对信号请求调整的速度相对于常规速度的比例,由 Scale (比例) 参数表示, 其取值可以正, 也可以为负, 取值为正表示正向, 取值为负表示反向。 Scale的 类型可以字符串、 浮点或整数, 例如, 当类型为字符串或浮点时, 可以定义取值 1 表示正 向等于常规速度, 取值 2表示正向两倍于常规速度, -1.5表示反向一倍半于常规速度; 当类 型为整数时, 可以定义取值为百分比, 取值 100表示正向等于常规速度, 200表示正向两倍 于常规速度, 50表示正向一半于常规速度, -150表示反向一倍半于常规速度, 0可以定义 为表示暂停或者定义为无意义。
RS信号还可以包含以下参数的任意组合:
1 ) SI ( Signal Identifier, 信号标识), 表示要调整速度的信号标识, 其类型为字符串, 格式可以为 "包标识 /信号标识"的形式,通过设置 SI可以达到调整单个信号的速度的目的;
2) SLI ( Signal List Identifier, 信号列表标识), 表示要调整速度的信号列表, 其类型为 整数, 通过设置 SLI可以达到调整某个信号列表 (包含一组信号) 的速度的目的;
3 ) MRI (Media Resource Identifier, 媒体资源标识), 表示要调整的媒体资源, 其类型 为字符串, 可以采用统一资源标识 (URL Uniform Resource Identifier) 或者国际化资源标 识 (IRI, Internationalized Resource Identifier), 当在一个终端或流上存在同种信号的多个实 例时, 可以通过媒体资源标识来区分。
参见图 2, 本发明实施例提供了一种调整信号速度的方法, 具体包括:
101: 当 MGC需要调整某个信号的速度时, MGC向 MG上对应的终端或流下发命令请 求, 该命令请求中包含 RS信号。
MGC可以通过 Add、 Modify、 Move或 Subtract等命令请求向 MG下发 RS信号, 该
RS信号中包括 Scale参数, 其取值为请求调整的速度相对于常规速度的比例, 缺省可以定 义为维持当前速度。
该 RS信号还可以包含 SI、 SLI、 MRI等参数的任意组合, 其组合含义具体如下:
1 )如果 MGC下发的 RS信号未包含 SI、 SLI或 MRI等参数, 则 MG收到命令请求后, 调整该终端或流上的所有信号和 /或信号列表;
2)如果 MGC下发的 RS信号包含 SI和 /或 SLI参数, 则 MG收到命令请求后, 调整该 终端或流上与该 SI对应的信号和 /或与该 SLI对应的信号列表;
3 ) 如果 MGC下发的 RS信号仅包含 MRI参数, 则 MG收到命令请求后, 调整该终端 或流上与该 MRI对应的媒体资源相关的所有信号和 /或信号列表;
4)如果 MGC下发的 RS信号包含 SI和 /或 SLI, 以及 MRI参数, 则 MG收到命令请求 后, 调整该终端或流上与该 MRI对应的媒体资源相关的与该 SI对应的信号和 /或与该 SLI 对应的信号列表。
为了避免 MGC在下发 RS信号后, MG不能够保持正在执行的操作, 可以在 MGC在 下发 RS信号的同时下发针对该 RS信号的信号和 /或信号列表,或者预先设置 MG在调整该 信号所针对的信号和 /或信号列表同时, 可以自动将该信号和 /或信号列表保留。
102: MG接收 MGC下发的命令请求, 根据命令请求中的 RS信号的参数调整该 RS信 号所针对的信号 /信号列表的速度。
MG根据 RS信号的参数调整信号的速度时, 如果 RS信号中只包含 Scale参数, 即只 包含 MGC对信号请求调整的速度相对于常规速度的比例, MG根据 Scale参数调整该命令 请求所针对的终端或流上所有信号和 /或信号列表的速度; 当 RS信号中还包含 SI、 SLI或 MRI等参数或其任意组合时, MC根据 Scale参数调整与 SI、 SLI或 MRI等参数或其任意组 合相对应的信号速度, 具体过程如下:
1 )如果 MGC下发的 RS信号未包含 SI、 SLI或 MRI等参数, 则 MG收到命令请求后, 根据 Scale参数调整该终端或流上的所有信号和 /或信号列表的速度;
2) 如果 MGC下发的 RS信号包含 SI和 /或 SLI参数, 则 MG收到命令请求后, 根据 Scale参数调整该终端或流上与该 SI对应的信号和 /或与该 SLI对应的信号列表的速度;
3 ) 如果 MGC下发的 RS信号仅包含 MRI参数, 则 MG收到命令请求后, 根据 Scale 参数调整该终端或流上与该 MRI对应的媒体资源相关的所有信号和 /或信号列表的速度;
4)如果 MGC下发的 RS信号包含 SI和 /或 SLI, 以及 MRI参数, 则 MG收到命令请求 后, 根据 Scale参数调整该终端或流上与该 MRI对应的媒体资源相关的与该 SI对应的信号 和 /或与该 SLI对应的信号列表的速度。
进一步地, 在 102中 MG收到 MGC下发的命令请求后, 还可以包括:
MG判断 MGC下发的 RS信号中所包含的 SI、 SLI或 MRI等参数或其任意组合与该命 令请求所针对的终端或流上的信号和 /或信号列表是否匹配, 如果是, 则根据 RS 信号及其 参数信息调整相应信号的速度; 否则, 向 MGC返回调整执行错误信息。 例如, 该 SI和 /或 SLI对应的信号在该终端或流上并不存在或已经完成, 那么 MG向 MGC返回错误响应, 例 如错误码 473 (代表矛盾的特性取值)。
103: MG调整相应信号的速度后, 向 MGC返回命令响应。
在上述 MG返回给 MGC的命令响应中, 包括 RS信号, 该 RS信号包括 Scale参数, 其取值为信号调整后的实际速度相对于常规速度的比例, 缺省可以定义为调整采用了所请 求的比例。 MG通过该参数向 MGC上报信号实际调整到的速度, 因为在实际应用中, MG 可能不能严格按照 MGC所请求的比例调整信号速度, 例如, MGC下发的命令请求中 Scale 参数取值为 2,表示要调整某个信号的速度为常规速度的两倍,而 MG调整后该信号的速度 可能为常规速度的 1.8倍, 这时 MG向 MGC上报的命令回应中 Scale参数取值为 1.8。
进一步地, 如果 MGC不关心信号调整后的实际速度, MG可以不用向 MGC返回命令 响应, 即可以省略 103, 或至少不用在向 MGC返回的命令响应中包括 RS信号及其 Scale 参数。 在上述调整信号速度的方法中,采用 MGC向 MG下发命令请求(下行)和 MG向 MGC 返回命令响应 (上行) 时, 使用统一的 Scale 参数的方式, 只是在命令请求和命令响应中 Scale参数的含义不同, 还可以通过上行与下行分别定义一个独立参数的方式来代替上述方 式, 例如, 在媒体网关控制协议中, 分别定义 RS (Requested Scale, 请求比例) 参数和 AS (Actual Scale, 实际比例) 参数, RS为 MGC下发给 MG的比例, 表示 MGC对信号请求 调整的速度相对于常规速度的比例; AS为 MG上报给 MGC的比例, 表示信号调整后的实 际速度相对于常规速度的比例 RS和 AS的类型和取值与上述 Scale参数相同, 此处不再赘 述。
如果采用独立参数的方式,则在 101中 MGC向 MG下发的包含 RS信号的命令请求中, 该 RS信号可以包含上述 RS参数, 缺省可以定义为维持当前速度; 当 MGC希望 MG返回 信号调整后的实际速度时, 该 RS信号还可以包含上述 AS参数, 但其取值为 "选择 "通配 符" $", 表示 MGC希望 MG返回信号调整后的实际速度; 在 103中 MG向 MGC返回的包 含 RS信号的命令响应中, 该 RS信号也可以包含上述 AS参数, 缺省可以定义为采用了所 请求的比例。
本实施例通过在媒体网关控制协议中引进一个 RS信号, 使得 MGC可以根据需要灵活 地对任意信号进行速度调整, 且由于该 RS信号是一个独立的信号, 可以实现信号速度的实 时调整, 实现简单高效。
实施例 2
本实施例首先扩展媒体网关控制协议, 在媒体网关控制协议中引进相对速度比例属性, 通过属性来表示信号速度调整信息, 该相对速度比例属性表示信号的调整速度相对于常规 速度的比例。
例如, 可以将该属性命名为 RSS (Relative Speed Scale, 相对速度比例)。 该属性可以 定义在现有包(Package)或新的包中,如果定义在新包中,可以将该新包命名为 SRSA( Signal Relative Speed Adjustment, 信号相对速度调整) 包。
该属性的作用与实施例 1中 Scale参数的作用相同,该属性的类型和取值也同上述 Scale 参数, 可读可写。 当由 MGC下发给 MG时, 表示 MGC对信号请求调整的速度相对于常规 速度的比例, 缺省可以定义为维持当前速度; 当由 MG返回给 MGC时, 表示信号调整后的 实际速度相对于常规速度的比例, 缺省可以定义为采用了所请求的比例。
采用属性方式进行信号速度调整时, 根据该属性应用于 MG上的终端或终端上的流, 分别对应在终端状态(Termination State)描述符或本地控制(Local Control)描述符中使用, 表示调整该终端或该流上的所有信号的速度。 参见图 3, 本实施例提供了一种调整信号速度的方法, 具体包括:
201: 当 MGC需要调整 MG上的终端或流上信号的速度时, 向 MG下发命令请求, 该 命令请求中包含 RSS属性, MGC通过该属性向 MG下发对信号请求调整的速度相对于常规 速度的比例。
202: MG收到 MGC下发的上述命令请求后, 并根据该命令请求中包含的 RSS属性调 整 MG上的终端或流上的所有信号的速度。
203: MG调整信号的速度后, 向 MGC返回相应的命令响应。
在上述 MG返回给 MGC的命令响应中, 也包含 RSS属性, MG通过该属性向 MGC上 报信号调整后的实际速度相对于常规速度的比例。
进一步地, 如果 MGC不关心信号调整后的实际速度, MG可以不用向 MGC返回命令 响应, 即 203可以省略, 或至少不用在向 MGC返回的命令响应中包括 RSS属性。
本发明实施例通过在媒体网关控制协议中引进 RSS属性, 在 MGC需要调整 MG上某 个终端或流上所有信号的速度时, 向 MG下发包含该属性的命令请求, 从而可以达到对任 意信号进行速度调整的目的, 满足了实时调整的需求, 实现简单高效。
实施例 3
参见图 4, 本发明实施例提供了一种媒体网关, 该媒体网关包括:
接收模块 301, 用于接收媒体网关控制器下发的命令请求, 该命令请求中包含信号速度 调整信息;
调整模块 302,用于根据接收模块 301接收的命令请求中包含的信号速度调整信息调整 信号速度。
进一步地, 上述媒体网关还可以包括:
发送模块 303, 用于向媒体网关控制器返回命令响应, 该命令响应中包含调整执行错误 信息或者信号速度调整信息, 信号速度调整信息包含媒体网关对信号调整后的实际速度相 对于常规速度的比例。
本实施例中调整模块 302根据接收模块 301接收到到的命令请求中的信号速度调整信 息对 MC上的某个或某组信号进行速度调整, 可以调整任意信号的速度, 避免了现有技术 中只能对播放信号进行速度调整的问题, 实现简单方便。
实施例 4
参见图 5, 本发明实施例提供了一种媒体网关控制器, 该媒体网关控制器包括: 发送模块 401, 用于向媒体网关下发命令请求, 该命令请求中包含信号速度调整信息。 上述发送模块 401 还可以用于向媒体网关下发命令请求, 该命令请求中包含需要调整 速度的信号。
进一步地, 上述媒体网关控制器还可以包括:
接收模块 402, 用于接收媒体网关返回的命令响应, 该命令响应包含调整执行错误信息 或者信号速度调整信息, 信号速度调整信息包含媒体网关对信号调整后的实际速度相对于 常规速度的比例。
本实施例中通过发送模块 401 向媒体网关下发包含信号速度调整信息的命令请求, 可 以实现对任意信号的速度调整, 实现简单。
本发明实施例可以通过软件实现, 相应的软件可以存储到可读取的存储介质中, 例如, 计算机的硬盘、 软盘或光盘中。 以上所述仅为本发明的较佳实施例, 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
1.一种调整信号速度的方法, 其特征在于, 所述方法包括:
接收媒体网关控制器下发的命令请求, 所述命令请求中包含信号速度调整信息; 根据所述信号速度调整信息调整信号速度。
2. 根据权利要求 1所述的调整信号速度的方法, 其特征在于, 所述方法还包括: 在接收所述命令请求的同时接收所述信号速度调整信息所针对的信号和 /或信号列表; 或
在根据所述信号速度调整信息调整信号速度的同时, 根据预先的设置保留所述信号速 度调整信息所针对的信号和 /或信号列表。
3 .根据权利要求 1所述的调整信号速度的方法, 其特征在于, 所述信号速度调整信息 包含所述媒体网关控制器对信号请求调整的速度相对于常规速度的比例,
相应地, 所述根据信号速度调整信息调整信号速度, 包括:
根据所述比例调整信号速度。
4. 根据权利要求 3所述的调整信号速度的方法, 其特征在于, 所述信号速度调整信息 进一步包含信号标识、 信号列表标识或媒体资源标识及其任意组合,
相应地, 所述根据所述比例调整信号速度, 包括:
根据所述比例调整与所述信号标识、 信号列表标识或媒体资源标识及其任意组合相对 应的信号速度。
5. 根据权利要求 4所述的调整信号速度的方法, 其特征在于, 所述信号速度调整信息 包含信号标识和 /或信号列表标识,
相应地, 所述根据所述比例调整信号速度, 包括:
根据所述比例调整终端或流上与所述信号标识和 /或信号列表标识对应的信号和 /或信 号列表的速度。
6. 根据权利要求 4所述的调整信号速度的方法, 其特征在于, 所述信号速度调整信息 包含媒体资源标识, 相应地, 所述根据所述比例调整信号速度, 包括:
根据所述比例调整终端或流上与所述媒体资源标识对应的媒体资源相关的所有信号和 / 或信号列表的速度。
7. 根据权利要求 4所述的调整信号速度的方法, 其特征在于, 所述信号速度调整信息 包含信号标识和 /或信号列表标识, 以及媒体资源标识,
相应地, 所述根据所述比例调整信号速度, 包括:
根据所述比例调整终端或流上与所述媒体资源标识对应的媒体资源相关的与所述信号 标识对应的信号和 /或与所述信号列表标识对应的信号列表的速度。
8. 根据权利要求 4所述的调整信号速度的方法, 其特征在于, 所述方法还包括: 向所述媒体网关控制器返回命令响应, 所述命令响应中包含信号速度调整信息, 所述 信号速度调整信息包含对所述信号调整后的实际速度相对于所述常规速度的比例。
9. 根据权利要求 3所述的调整信号速度的方法, 其特征在于, 所述接收媒体网关控制 器下发的命令请求后还包括:
判断所述信号标识、 信号列表标识、 媒体资源标识的任意组合是否与所述命令请求针 对的终端或流上的信号和 /或信号列表匹配, 如果是, 则根据所述信号速度调整信息调整信 号速度; 否则, 向所述媒体网关控制器返回调整执行错误信息。
10. 根据权利要求 1、 2、 4、 5、 6、 7或 8任一权利要求所述的调整信号速度的方法, 其特征在于, 所述信号速度调整信息通过扩展的信号表示。
11. 根据权利要求 3或 8中任一项权利要求所述的调整信号速度的方法, 其特征在于, 所述比例通过扩展的属性表示。
12. 根据权利要求 3所述的调整信号速度的方法, 其特征在于, 所述比例参数进一步包 括请求比例和实际比例, 所述方法还包括:
向所述媒体网关控制器返回命令响应, 所述命令响应中包含信号速度调整信息, 所述 信号速度调整信息包含所述媒体网关采用所述请求比例的信息。
13.—种媒体网关, 其特征在于, 所述媒体网关包括:
接收模块, 用于接收媒体网关控制器下发的命令请求, 所述命令请求中包含信号速度 调整信息;
调整模块, 用于根据所述接收模块接收的命令请求中包含的信号速度调整信息调整信 号速度。
14. 根据权利要求 13所述的媒体网关, 其特征在于, 所述媒体网关还包括: 发送模块, 用于向所述媒体网关控制器返回命令响应, 所述命令响应中包含调整执行 错误信息或者信号速度调整信息, 所述信号速度调整信息包含所述媒体网关对所述信号调 整后的实际速度相对于所述常规速度的比例。
15. 一种媒体网关控制器, 其特征在于, 所述媒体网关控制器包括:
发送模块, 用于向媒体网关下发命令请求, 所述命令请求中包含信号速度调整信息。
16. 根据权利要求 15所述的媒体网关控制器, 其特征在于, 所述发送模块还用于向媒 体网关下发命令请求, 所述命令请求中包含需要调整速度的信号。
17. 根据权利要求 15所述的媒体网关控制器, 其特征在于, 所述媒体网关控制器还包 括:
接收模块, 用于接收所述媒体网关返回的命令响应, 所述命令响应包含调整执行错误 信息或者信号速度调整信息, 所述信号速度调整信息包含所述媒体网关对所述信号调整后 的实际速度相对于所述常规速度的比例。
PCT/CN2008/072822 2007-12-29 2008-10-24 Procédé destiné à régler la vitesse d'un signal, passerelle multimédia et contrôleur de passerelle multimédia WO2009082903A1 (fr)

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