CN1823527A - 管理数据流速率变化的方法 - Google Patents

管理数据流速率变化的方法 Download PDF

Info

Publication number
CN1823527A
CN1823527A CNA2004800205788A CN200480020578A CN1823527A CN 1823527 A CN1823527 A CN 1823527A CN A2004800205788 A CNA2004800205788 A CN A2004800205788A CN 200480020578 A CN200480020578 A CN 200480020578A CN 1823527 A CN1823527 A CN 1823527A
Authority
CN
China
Prior art keywords
flow rate
data
predefine
counter
video conference
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CNA2004800205788A
Other languages
English (en)
Other versions
CN100466719C (zh
Inventor
P·A·卡尔森
O·L·卡尔格拉夫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cisco Systems International SARL
Original Assignee
Tandberg Telecom AS
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 Tandberg Telecom AS filed Critical Tandberg Telecom AS
Publication of CN1823527A publication Critical patent/CN1823527A/zh
Application granted granted Critical
Publication of CN100466719C publication Critical patent/CN100466719C/zh
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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
    • H04L65/80—Responding to QoS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
    • H04L47/2416—Real-time traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/26—Flow control; Congestion control using explicit feedback to the source, e.g. choke packets
    • H04L47/263—Rate modification at the source after receiving feedback
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/30—Flow control; Congestion control in combination with information about buffer occupancy at either end or at transit nodes
    • 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
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1101—Session protocols
    • H04L65/1104—Session initiation protocol [SIP]
    • 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
    • H04L65/1106—Call signalling protocols; H.323 and related
    • 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
    • H04L65/40—Support for services or applications
    • H04L65/403—Arrangements for multi-party communication, e.g. for conferences
    • H04L65/4038—Arrangements for multi-party communication, e.g. for conferences with floor control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47—End-user applications
    • H04N21/478—Supplemental services, e.g. displaying phone caller identification, shopping application
    • H04N21/4788—Supplemental services, e.g. displaying phone caller identification, shopping application communicating with other users, e.g. chatting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/637—Control signals issued by the client directed to the server or network components
    • H04N21/6373—Control signals issued by the client directed to the server or network components for rate control, e.g. request to the server to modify its transmission rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/647—Control signaling between network components and server or clients; Network processes for video distribution between server and clients, e.g. controlling the quality of the video stream, by dropping packets, protecting content from unauthorised alteration within the network, monitoring of network load, bridging between two different networks, e.g. between IP and wireless
    • H04N21/64707—Control signaling between network components and server or clients; Network processes for video distribution between server and clients, e.g. controlling the quality of the video stream, by dropping packets, protecting content from unauthorised alteration within the network, monitoring of network load, bridging between two different networks, e.g. between IP and wireless for transferring content from a first network to a second network, e.g. between IP and wireless
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/14—Systems for two-way working
    • H04N7/15—Conference systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • Business, Economics & Management (AREA)
  • General Business, Economics & Management (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Communication Control (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

本发明公开了一种当H.323端点正在发射比初始协商的更多的视频或其它数据时检测数据生产过剩的方法，并通过使用标准流控制程序来使其产生较少。周期性地发送流控制消息，该消息递增地指示H.323端点发射较低量的比特率，直到从端点接收的视频速率等于或低于初始协商的速率或某其它固定速率为止。

Description

管理数据流速率变化的方法
技术领域
本发明涉及视频会议系统中的流控制。
背景技术
视频会议系统传统上适应于使用电路交换和分组交换网络。由此，已经竭力获得电路交换和分组交换终端之间的互操作性，这提供了在不损失质量或引入延时情况下的交互作用和通信。如ISDN的电路交换网络上多媒体通信的公共标准是来自国际电信联盟(ITU)的H.320标准。用于分组交换的相应标准是H.323。由于本发明涉及流控制，这是与分组交换有关的问题，因此以下详细描述H.323。
如上所述，H.323是来自国际电信联盟(ITU)的综合建议，其设置没提供有保证的服务质量的分组交换网络上多媒体通信的标准。这些网络遍布在许多公司终端上，并包括以太网、快速以太网和令牌网技术上的TCP/IP和IPX。名为“基于分组的多媒体通信系统”的H.323标准提供了包括因特网的基于IP的网络上音频、视频以及数据通信的基础。遵循H.323标准的多媒体产品和应用是可共同操作的、可彼此通信的并由此兼容的。许多子标准组成了H.323标准或协议，其中之一是H.245标准。
H.245标准定义了H.323标准的控制协议部分。根据该协议，存在几种在呼叫期间改变流速率的方法。最强的方法是发送“流控制命令”到发射终端。该“流控制命令”包括字段“逻辑信道号”和“最大比特率”。“最大比特率”指示逻辑信道的最大允许比特率。该消息是不可拒绝的，即，在接收到该消息之后，不允许终端以更高的速率发射。“流控制命令”用于初始设置终端之间协商的最大数据速率。改变比特率的备选方法是使用逻辑信道比特率消息流。出于示例性目的，考虑使用逻辑信道比特率消息来改变从端点发射的流速率的网关。“逻辑信道速率请求”消息从网关发射到端点。除了指示逻辑信道的请求的最大比特率的“最大比特率”(以100比特/s为单位)以外，该消息还包括指示比特率改变请求应用到的逻辑信道的“逻辑信道号”。端点通过返回“逻辑信道速率确认”消息来批准和确认对指定信道的数据速率改变的请求，该“逻辑信道速率确认”消息包括与先前接收的“逻辑信道速率请求”消息中相同的参数。备选地，如果由于某些原因端点不接受请求的改变，则包括“拒绝原因”的“逻辑信道速率拒绝”响应“逻辑信道速率请求”消息，该“拒绝原因”指示拒绝请求的原因。
H.323的备选协议是SIP(会话发起协议)协议。在当前的SIP标准中，通过将“再邀请”消息发射到端点来执行改变呼叫期间的流速率。“再邀请”消息携带了与“邀请”消息相同的信息，包括呼叫建立时使用的所谓“设置进程权限”。由此，“再邀请”消息还包括最大允许比特率，因此，发射具有新的最大允许数据速率的“再邀请”消息而留下其它未改变的数据将具有与H.323中“流控制命令”相同的效果。
网关提供多媒体会议中端点之间通信路径的IP侧与电路交换侧之间的连接。从位于IP侧的端点来看，电路交换侧的端点实际上被转换为IP端点，反之亦然。因此，网关的主要任务是实时地翻译和重新打包网络上的数据流。在从H.323端点发射的包被取出并配置在固定大小的H.320帧中之前，这些包暂时存储在缓冲器中。
在网关中从H.323到H.320的翻译过程是通过从RFC2032(RTP上的H.261)、RFC2190(RTP上的H.263)和RFC2429(RTP上的H.263+)指定的包中提取原始视频数据并将该原始数据转发到所谓的BCH编码器来实现的。
由于在上述RFC中描述的分包方案具有与包分离可能发生的位置有关的严格规则，因此当沿相反方向从H.320翻译为H.323时，过程更加复杂。在图像、“块组”(GOB)和“宏块”(MB)级允许特定的包分离。由于MB级上的分离具有由于需要与视频数据一起发射一些视频解码器状态信息所引起的相关开销，因此最希望分离发生在图像和GOB级。
常规的实现使用可变长度解码来确定视频流中“块组”(GOB)的位置和长度。当它找到GOB时，它通过使用GOB中的比特数(a)、当前包中的可用比特数(b)以及最大包大小(c)来处理相应比特，以选择如下动作中的一种：
·如果a＜＝b，则将GOB添加到当前包；
·如果a＞b且a＜＝c，则发射当前包并将GOB添加到新的包；
·如果a＞b且a＞c，则发射当前包并用次最佳宏块级发射GOB。
这三种规则对分包进行优化，以便如果有可能的话适合包中的整个GOB，同时还在可能时组合一个包中的几个GOB。这是所期望的，因为GOB排列的包具有较少的开销，并且少量的大包需要比许多小包还少的处理开销。
除了以上规则，当图像中最后的GOB被添加到包时，也发射包。该附加规则防止网关积累不必要的延时。
共同连接在网关单元中的H.323端点和H.320端点不能使用端对端流控制，因为H.320协议不支持它。然而，在网关和H.323端点之间可使用流控制。仅从网关到H.323端点的流控制消息会具有任何效应。例如在来自Polycom和Ezenia的已知H320/H323网关中的典型情况是网关最初会将流控制消息发送到H.323端点，以将产生的视频数据速率调节为来自网关的输出H.320连接中的可用容量。不可能流控制H.320端点，因为H.320协议完全不支持它。这意味着H.320可产生比H.323端点支持的更多的视频。只有从网关到H.323的流控制消息将具有任何效应。该效应将取决于H.323端点中的流控制支持。
然后当H.323端点由于一些原因而开始以高于流控制发起的比特率来将数据发射到网关时，问题出现了。这可能是由于端点中的缺陷、数据设定的丢失或漂移或者错误的挂钟而发生的。然后网关将不能以填满缓冲器的速度将数据捕获到H.320帧。在第一个例子中，这意味着在数据发射中不断加大的延时，因为有效负载将在缓冲器中花费较长时间，这对于诸如视频会议的实时应用是非常重要的。此外，在某些点处，将达到缓冲器的填充上限。当达到填充上限时，网关除了拒绝随后的输入数据外别无选择。这样的结果是数据丢失，对H.320端点的用户显示为图像伪像。
发明内容
在所公开的独立权利要求中定义的特征表征该配置和方法。
具体地说，本发明公开了一种调节从第一分组交换H.323或SIP配置视频会议终端发射并在第二分组交换H.323或SIP配置视频会议终端中接收的数据的流速率的方法，在捕获该接收数据用于进一步处理之前将该数据暂时存储在第二分组交换视频会议终端中的一个或多个缓冲器中，在从所述一个或多个缓冲器中捕获每个数据之后，该方法还包括以下步骤：比较一个或多个缓冲器的填充水平(filllevel)与预定义水平，如果所述填充水平低于所述预定义水平，则复位计数器，如果所述填充水平大于所述预定义水平，则递增所述计数器，并比较所述计数器与预定义计数器限制，如果所述计数器大于所述预定义计数器限制，则复位所述计数器，并通过将流控制消息从第二分组交换终端发送到第一分组交换终端来降低发射数据的流速率，所述流控制消息指示第一分组交换终端根据包含在所述流控制消息中的流速率值来降低流速率。
附图说明
为了使本发明更容易理解，以下讨论将参考附图，
图1是示出本发明优选实施例的流程图。
具体实施方式
在下文中，将通过描述优选实施例并通过参考附图来讨论本发明。然而，本领域的技术人员将认识到所附独立权利要求中定义的本发明范围内的其它应用和修改。
本发明提供当例如H.323端点发射比初始协商的更多的视频或其它数据时数据生产过剩的自动检测，并通过将上述消息流用于数据速率改变或其它流控制机制来使它产生的较少。在H.323的情况下，将“流控制命令”或“逻辑信道速率请求”消息周期性地发射到讨论中的端点，该消息具有递增的较低量“最大比特率”，直到从端点接收的视频速率等于或低于初始协商的速率或某其它固定速率为止。
本发明的方法特别可用在网关中。通过周期性地观察输入缓冲器中的数据量来检测网关中视频数据的生产过剩。如果在定义的时段内数据量大于某个限制，则端点被看作生产过量。该缓冲器的数据限制最好设置为与输出H.320视频速率成比例。
当检测到生产过剩时，将新的“流控制命令”或“逻辑信道速率请求”消息发送到H.323端点。然后以常量降低比特率。应该预先定义用于观察超过限制的缓冲器水平的时段。
现在将参考图1的流程图来描述本发明的优选实施例。感兴趣的数据流是从H.323端点发射到H320/H323网关的视频数据。网关将输入视频数据的有效负载重新打包成持续时间为10ms的H.320帧，该帧能够携带常量的视频数据。从而，在10ms的间隔，视频重新打包器(repacker)被要求产生适合10ms(H.221)帧的数据。计数器跟踪自从上次缓冲器的填充水平低于预定义水平以来来自缓冲器的数据捕获事件的数目。
在重新打包器已经产生了用于H.221帧的数据之后，检验buffer_level，其指示暂时存储端点的输入视频数据的视频缓冲器的填充水平。如果buffer_level低于预定义Max_level，则计数器复位，并且过程等待重新打包器产生用于另一个H.221帧的新数据，但如果不是，则计数器递增。在该例子中，Max_level是10ms H.221帧中的最大视频数据量。
然后，研究计数器本身，并且如果其低于预定义overprod_level，则过程等待重新打包器产生用于另一个H.221帧的新数据。如果不是，则H.323端点被认为生产过剩。计数器复位，并且从H.323端点发射的视频数据的数据流速率逐步下降由参数flow_step所指示的预定义量。在该例子中，flow_step是16k比特的常数。通过发射包括当前流速率减去flow_step的“最大比特率”和指示视频数据逻辑信道的“逻辑信道号”的“流控制命令”或“逻辑信道速率请求”消息来执行数据流速率的递减。然而，在进行递减之前，必须检验当前流速率减去flow_step是否低于预定义flow_min。如果情况如此，则绕过该递减，并且过程等待重新打包器产生用于另一个H.221帧的新数据。这样做的原因是确保从H.323端点发射的实际视频数据速率决不设为0。
为了防止例如数据突发触发流速率的过大下降，最好应该引入截取产生数据突发的至少最普通事件的机制。例如，考虑其中端点具有不同呼叫速率的H.323会议呼叫的情况。具有最低呼叫速率的端点最初会将流控制消息发送到其它端点，以使这些端点以低速率产生。然而，这不会阻止短期的生产过剩。这个起始突发可能触发本发明的溢出检测机制降低比需要的大的流速率。为了避免这种情况，网关可配置为在视频信道打开之后定义的时段总是将流速率升高到输出H.320速率。
本发明处理H.323端点(或适应于类似标准的端点)，该端点始终产生与流控制初始速率有关的更多视频数据(或其它多媒体数据)。
换而言之，本发明使网关与防止缓冲器溢出和数据丢失的始终生产过剩的H.323端点一起工作。以这种方式，可以避免或大大减少延时和图像伪像的形成。
本发明并不仅局限于端点和网关之间的流控制，而是可使用端对端环境，或者MCU和端点之间的流控制。本发明也不局限于H.323标准，而是还可与其它类似标准(例如SIP标准)结合使用。在SIP标准的情况下，与H.323有关的描述中所用的“流控制命令”用背景部分中描述的“重新邀请”消息来代替。本发明适用于用于流控制的SIP和H.323标准的未来版本中的任何消息或方法。

Claims (6)

1.一种调节从第一分组交换H.323或SIp配置视频会议终端发射并在第二分组交换H.323或SIP配置视频会议终端中接收的数据的流速率的方法，在捕获所述接收数据用于进一步处理之前将其暂时存储在第二分组交换视频会议终端中的一个或多个缓冲器中，其特征在于：
在从所述一个或多个缓冲器中捕获每个数据之后，
比较所述一个或多个缓冲器的填充水平与预定义水平，
如果所述填充水平低于所述预定义水平，则
复位计数器，
如果所述填充水平大于所述预定义水平，则
递增所述计数器，并且
比较所述计数器与预定义计数器限制，
如果所述计数器大于所述预定义计数器限制，则
复位所述计数器，并且
通过将流控制消息从第二分组交换终端发送到第一分组交换终端来降低所述发射数据的流速率，所述流控制消息指示第一分组交换终端根据包含在所述流控制消息中的流速率值来降低所述流速率。
2.如权利要求1所述的方法，其特征在于，第二分组交换视频会议终端是网关。
3.如权利要求1或2所述的方法，其特征在于，所述流速率降低预定义恒值。
4.如权利要求3所述的方法，其特征在于，降低所述流速率的步骤之前的如下步骤：
将所述流速率和所述预定义恒值之间的差与预定义流速率下限相比较，
只有当所述差大于所述预定义流速率下限时才执行降低所述流速率的步骤。
5.如权利要求2-4中一项所述的方法，其特征在于，所述网关是H.323/H.320网关，并且所述预定义水平等于H.320帧中的最大数据量，从所述一个或多个缓冲器中捕获的数据被插入所述H.320帧中。
6.如权利要求5所述的方法，其特征在于，所述数据是在视频会议中从第一分组交换视频会议终端经由第二分组交换视频会议终端发射到电路交换终端的视频、音频和/或其它多媒体数据。
CNB2005101100135A 2003-05-23 2004-05-13 管理数据流速率变化的方法 Expired - Fee Related CN100466719C (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20032342A NO319422B1 (no) 2003-05-23 2003-05-23 Fremgangsmate for handtering av datahastighetsendringer
NO20032342 2003-05-23

Publications (2)

Publication Number Publication Date
CN1823527A true CN1823527A (zh) 2006-08-23
CN100466719C CN100466719C (zh) 2009-03-04

Family

ID=19914792

Family Applications (1)

Application Number Title Priority Date Filing Date
CNB2005101100135A Expired - Fee Related CN100466719C (zh) 2003-05-23 2004-05-13 管理数据流速率变化的方法

Country Status (7)

Country Link
US (1) US7697553B2 (zh)
EP (1) EP1627529B1 (zh)
JP (1) JP4498359B2 (zh)
CN (1) CN100466719C (zh)
AT (1) ATE518368T1 (zh)
NO (1) NO319422B1 (zh)
WO (1) WO2004105394A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021073447A1 (zh) * 2019-10-16 2021-04-22 中兴通讯股份有限公司 管控方法、终端、系统及计算机可读存储介质

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070133413A1 (en) * 2005-12-09 2007-06-14 Andrew Pepperell Flow control in a video conference
CN1988533B (zh) * 2005-12-19 2012-10-17 华为技术有限公司 一种实现IuUP/NBUP协议过程控制功能的方法
US20070204065A1 (en) * 2006-02-27 2007-08-30 Harton David C Method and system for providing communication protocol interoperability
US20070201367A1 (en) * 2006-02-27 2007-08-30 Cisco Technology, Inc. System and method for interworking H.323 flow control with SIP
US7889649B2 (en) * 2006-12-28 2011-02-15 Ebay Inc. Method and system for gateway communication
US8243119B2 (en) 2007-09-30 2012-08-14 Optical Fusion Inc. Recording and videomail for video conferencing call systems
JP2009110609A (ja) * 2007-10-31 2009-05-21 Hitachi Ltd ストリームデータ転送制御機構
WO2011044287A1 (en) * 2009-10-06 2011-04-14 Openwave Systems Inc. Managing network traffic by editing a manifest file and/or using intermediate flow control
CN102289747B (zh) * 2011-08-30 2014-03-12 中国科学院计算技术研究所 一种面向分布式工作流的数据流调度方法和系统
CN108370327A (zh) 2015-09-25 2018-08-03 Fsa技术股份有限公司 多干线数据流调节系统和方法
WO2020252409A1 (en) * 2019-06-13 2020-12-17 Mersive Technologies, Inc. Bridging video conference room system and associated methods

Family Cites Families (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE59206183D1 (de) 1992-01-30 1996-06-05 Siemens Ag Verfahren zur Begrenzung der Rate von Nachrichtenzellen einer virtuellen Verbindung
WO1996008899A1 (en) * 1994-09-17 1996-03-21 International Business Machines Corporation Flow control method and apparatus for cell-based communication networks
US5600646A (en) * 1995-01-27 1997-02-04 Videoserver, Inc. Video teleconferencing system with digital transcoding
JP3207709B2 (ja) * 1995-04-26 2001-09-10 株式会社グラフィックス・コミュニケーション・ラボラトリーズ 多重化データ相互通信方法、多重化データ相互通信システム、ゲートウエイおよび非同期網上の端末
US5812699A (en) * 1995-12-07 1998-09-22 Intel Corporation Counter-based controller for video compression
US6381216B1 (en) * 1997-10-28 2002-04-30 Texas Instruments Incorporated Simplified switch algorithm for flow control of available bit rate ATM communications
US6065131A (en) * 1997-11-26 2000-05-16 International Business Machines Corporation Multi-speed DSP kernel and clock mechanism
CA2239060A1 (en) * 1998-05-28 1999-11-28 Newbridge Networks Corporation Rate monitoring of connections in a communications network using history buffer
US6167029A (en) * 1998-10-13 2000-12-26 Xaqti Corporation System and method for integrated data flow control
US20010046209A1 (en) * 1998-12-31 2001-11-29 David N. Glassman Database workflow for multimedia networking and voip
JP2000216819A (ja) * 1999-01-22 2000-08-04 Nec Corp 帯域制御装置及びそのバッファ漏れ抑制方法並びにバッファ漏れ抑制制御プログラムを格納した記憶媒体
US6657954B1 (en) * 1999-03-31 2003-12-02 International Business Machines Corporation Adapting receiver thresholds to improve rate-based flow control
US20030058836A1 (en) * 2000-03-01 2003-03-27 Roni Even Method for establishing a multimedia connection with quality of service using an ATM backbone
US6606112B1 (en) * 2000-03-16 2003-08-12 Tandberg Telecom As Composite-video generation from different-rate constituents
US6831893B1 (en) * 2000-04-03 2004-12-14 P-Cube, Ltd. Apparatus and method for wire-speed classification and pre-processing of data packets in a full duplex network
FI20002848A (fi) * 2000-12-22 2002-06-23 Nokia Corp Vuon valvonta tietoliikenneverkossa
US20030028643A1 (en) * 2001-03-13 2003-02-06 Dilithium Networks, Inc. Method and apparatus for transcoding video and speech signals
US20020149672A1 (en) * 2001-04-13 2002-10-17 Clapp Craig S.K. Modular video conferencing system
US7269139B1 (en) * 2001-06-27 2007-09-11 Cisco Technology, Inc. Method and apparatus for an adaptive rate control mechanism reactive to flow control messages in a packet switching system
DE10132156C5 (de) * 2001-07-03 2011-12-01 Manroland Ag Bahnstabilisierung zur berührungslosen Bahnführung bei fliegend wechselbaren Druckeinheiten
US7068601B2 (en) * 2001-07-16 2006-06-27 International Business Machines Corporation Codec with network congestion detection and automatic fallback: methods, systems & program products
US7225459B2 (en) * 2001-10-17 2007-05-29 Numerex Investment Corproation Method and system for dynamically adjusting video bit rates
EP1331766A1 (en) * 2001-12-20 2003-07-30 Alcatel A telecommunications system employing virtual service network architecture
US7382768B2 (en) * 2002-10-11 2008-06-03 Agilent Technologies, Inc. Real-time protocol (RTP) flow analysis using network processor
CN1270533C (zh) * 2002-12-23 2006-08-16 中兴通讯股份有限公司 会议电视多点控制设备中数据处理的方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021073447A1 (zh) * 2019-10-16 2021-04-22 中兴通讯股份有限公司 管控方法、终端、系统及计算机可读存储介质

Also Published As

Publication number Publication date
NO20032342L (no) 2004-11-24
US20050013312A1 (en) 2005-01-20
EP1627529B1 (en) 2011-07-27
CN100466719C (zh) 2009-03-04
WO2004105394A1 (en) 2004-12-02
EP1627529A1 (en) 2006-02-22
JP2007514335A (ja) 2007-05-31
US7697553B2 (en) 2010-04-13
NO20032342D0 (no) 2003-05-23
ATE518368T1 (de) 2011-08-15
NO319422B1 (no) 2005-08-08
JP4498359B2 (ja) 2010-07-07

Similar Documents

Publication Publication Date Title
US7826384B2 (en) Method and apparatus for negotiating bearer control parameters using property sets
CN101436990B (zh) 一种自动调整编码速率的方法、接收装置及通信系统
Hamdi et al. Voice service interworking for PSTN and IP networks
KR100738548B1 (ko) ＶｏＩＰ 화상 통화 장치 및 그 방법
US8391278B2 (en) Method of providing a service over a hybrid network and system thereof
EP2351272B1 (en) Devices, methods, and media for determining and assigning optimal media characteristics in communications sessions
US20120047273A1 (en) Device initiated multiple grants per interval system and method
EP1024637A1 (en) System and method for coding algorithm adjustment in telephony-over-lan networks
CN100466719C (zh) 管理数据流速率变化的方法
US20150092774A1 (en) Method and communication system for selecting a transmission mode for transmitting payload data
AU2006283294A1 (en) Method for signaling a device to perform no synchronization or include a syncronization delay on multimedia streams
EP2088735A1 (en) Client side media splitting function
US6980569B1 (en) Apparatus and method for optimizing packet length in ToL networks
US7684384B2 (en) Method for bitrate adjustment
US20110164529A1 (en) Method and apparatus for dynamically adjusting broadband access bandwidth
US20170318062A1 (en) Method for setting up a communication link
CN100423510C (zh) 监控rtp/rtcp流以提高多媒体通信质量的方法
US20060159124A1 (en) Access control of a multimedia session according to network resources availability
EP2081349A1 (en) Method and system for transcoding avoidance in Border Gateways
CN102098488A (zh) 基于3g网络的嵌入式网络视频监控系统
EP1429511B1 (en) Telecommunication system and method for transmitting video data between a mobile terminal and Internet
WO2006135250A2 (en) Method for down-speeding in an ip communication network
Salam et al. Mobile VoIP: Managing, scheduling and refining voice packets to and from mobile phones
EP1739915A1 (en) Network arrangement and method for handling sessions in a telecommunications network
Vetteth et al. Voice Over IP

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
ASS Succession or assignment of patent right

Owner name: CISCO SYSTEMS INTERNATIONAL BV

Free format text: FORMER OWNER: TANDBERG TELECOM AS

Effective date: 20120417

C41 Transfer of patent application or patent right or utility model
TR01 Transfer of patent right

Effective date of registration: 20120417

Address after: Swiss basil

Patentee after: Cisco Systems International Sarl

Address before: Norway Lv Sake

Patentee before: Tandberg Telecom AS

CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20090304

Termination date: 20210513