WO2011103747A1 - 一种会话处理方法和系统 - Google Patents

一种会话处理方法和系统 Download PDF

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Publication number
WO2011103747A1
WO2011103747A1 PCT/CN2010/076954 CN2010076954W WO2011103747A1 WO 2011103747 A1 WO2011103747 A1 WO 2011103747A1 CN 2010076954 W CN2010076954 W CN 2010076954W WO 2011103747 A1 WO2011103747 A1 WO 2011103747A1
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WIPO (PCT)
Prior art keywords
cluster
control center
pds
conference
video conference
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PCT/CN2010/076954
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English (en)
French (fr)
Inventor
王绍星
凌勇
李继朝
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ZTE Corp
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ZTE Corp
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Publication date
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Priority to EP10846370.4A priority Critical patent/EP2515534A4/en
Priority to US13/257,883 priority patent/US8803942B2/en
Publication of WO2011103747A1 publication Critical patent/WO2011103747A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H04N7/152—Multipoint control units therefor
    • 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
    • H04L65/1069—Session establishment or de-establishment
    • 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
    • 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
    • H04L65/4061—Push-to services, e.g. push-to-talk or push-to-video
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/14—Systems for two-way working
    • H04N7/141—Systems for two-way working between two video terminals, e.g. videophone
    • H04N7/148—Interfacing a video terminal to a particular transmission medium, e.g. ISDN
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H04W4/10—Push-to-Talk [PTT] or Push-On-Call services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/40—Connection management for selective distribution or broadcast
    • H04W76/45—Connection management for selective distribution or broadcast for Push-to-Talk [PTT] or Push-to-Talk over cellular [PoC] services

Definitions

  • the present invention relates to session technologies in the field of wireless communications, and more particularly to a session processing method and system. Background technique
  • the high-speed data transmission link of the wireless broadband network provides guarantee for large-traffic data transmission of the wireless access terminal (AT, Access Terminal).
  • the AT has the function of collecting video data and audio data, and can be connected to a packet core network (PCN, Packet Core Network) through a Radio Access Network (RAN), and then accesses a wireless broadband network system.
  • PCN Packet Core Network
  • RAN Radio Access Network
  • the wireless video conferencing system is developed on the basis of the wireless broadband network system.
  • the network structure is shown in Figure 1.
  • the AT establishes a link with the conference control center through the RAN, PCN, and Internet Protocol (IP) network.
  • IP Internet Protocol
  • the link can transmit media data and control information of the wireless video conference in two directions, the media data includes a video stream and an audio stream; the AT has the capability of collecting media data, and the AT and the RAN transmit data through an air interface (UM) protocol, PCN
  • UM air interface
  • PCN air interface
  • the data is transmitted between the conference control center and the Transmission Control Protocol (TCP).
  • TCP Transmission Control Protocol
  • the conference control center has the function of receiving and distributing media data streams, and inviting the AT to join and exit the video conference through air interface signaling.
  • the above-mentioned wireless video conferencing system realizes the conference between the ATs supporting the wireless video.
  • the existing cluster system is shown in Figure 2.
  • the cluster terminals pass through the base station (BS, Base Station), cluster scheduling client (PDC, PTT Dispatch Client), cluster scheduling server (PDS, PTT Dispatch Server) and IP.
  • the network transmits data, and the cluster terminal accepts the scheduling of the PDS.
  • the cluster terminal cannot parse the video stream transmitted by the wireless video conference, and the cluster terminal and the AT supporting the wireless video are not directly in the same network, the session between the AT supporting the wireless video and the ordinary cluster terminal cannot be realized. Summary of the invention
  • the main object of the present invention is to provide a session processing method and system for implementing a session between a wireless video supporting AT and a general cluster terminal in a wireless video conferencing system.
  • the present invention provides a session processing method, the method comprising:
  • the wireless access terminal (AT) supporting the wireless video sends a cluster user command to the conference control center, where the command includes a cluster user identifier that is invited to join the video conference;
  • the conference control center sends an invitation to the cluster terminal corresponding to the cluster user identifier by using a cluster scheduling server (PDS);
  • PDS cluster scheduling server
  • the AT and the cluster terminal perform session interaction based on the link.
  • the session processing from the AT to the cluster terminal direction is specifically:
  • the AT sends the multimedia data to the conference control center through the radio access network (RAN), the packet core network (PCN), and the IP network in sequence;
  • RAN radio access network
  • PCN packet core network
  • IP network IP network
  • the conference control center splits the received multimedia data into a video stream and an audio stream, and sends the split audio stream to the PDS;
  • the PDS forwards the received audio stream to a cluster terminal in the video conference.
  • the session processing from the cluster terminal to the AT direction is specifically:
  • the cluster terminal sends the voice data to the PDS;
  • the PDS When determining that the cluster terminal belongs to the video conference, the PDS sends the received voice data to the conference control center and other cluster terminals belonging to the video conference;
  • the conference control center encapsulates the received voice data into an audio stream in a multimedia format and transmits the audio stream to an AT in the video conference.
  • the AT sends a join user command to the conference control center, specifically:
  • the AT encapsulates the cluster user ID that is invited to join the video conference into the video conference management information, and sends the cluster user command carrying the video conference management information to the conference control center through the RAN, the PCN, and the IP network in sequence;
  • the conference control center After the AT sends the join user command to the conference control center, the conference control center obtains the cluster user identifier by parsing the video conference management information.
  • the method further includes:
  • the cluster terminal that receives the invitation does not agree to join the video conference, it returns a negative (NACK) response to the PDS, and the PDS forwards the NACK response to the conference control center, and the conference control center sends the IP network, PCN, and PAN in turn.
  • NACK negative
  • the present invention also provides a session processing system, which includes: an AT supporting a wireless video, a conference control center, a PDS, and a cluster terminal, where
  • the AT is configured to send a join user command to the conference control center, where the instruction includes a cluster user identifier that invites to join the video conference;
  • the conference control center is configured to send an invitation to the cluster terminal corresponding to the cluster user identifier by using the PDS;
  • the cluster terminal is configured to: when receiving an invitation and agree to join the video conference, return an ACK response to the PDS, and establish a link with the PDS;
  • the PDS is configured to forward an invitation from the conference control center to the cluster terminal, and after receiving the ACK response from the cluster terminal, establish a link with the cluster terminal; and establish a link After success, return an ACK response to the conference control center;
  • the AT and the cluster terminal are further configured to perform session interaction based on the link.
  • the AT is further configured to send the multimedia data generated by the session itself to the conference control center through the RAN, the PCN, and the IP network in sequence;
  • the conference control center is further configured to split the received multimedia data into a video stream and an audio stream, and send the split audio stream to the PDS;
  • the PDS is further configured to forward the received audio stream to a cluster terminal in the video conference.
  • the cluster terminal is further configured to: send voice data generated by itself during the session to the PDS;
  • the PDS is further configured to, when determining that the cluster terminal belongs to a video conference, send the received voice data to a conference control center and other cluster terminals belonging to the video conference;
  • the conference control center is further configured to encapsulate the received voice data into an audio stream in a multimedia format, and send the audio stream to an AT in the video conference.
  • the AT is further configured to encapsulate the cluster user identifier that is invited to join the video conference into the video conference management information, and send the join cluster user command carrying the video conference management information to the conference control center through the RAN, the PCN, and the IP network. ;
  • the conference control center is further configured to obtain the cluster user identifier by analyzing the video conference management information.
  • the cluster terminal is further configured to: when receiving the invitation but does not agree to join the video conference, return a NACK response to the PDS;
  • the PDS is further configured to forward the NACK response to the conference control center;
  • the conference control center is further configured to sequentially send through an IP network, a PCN, or a PAN
  • the NACK response is given to the AT.
  • the AT supporting the wireless video sends a cluster user command to the conference control center, where the command includes the cluster user identifier invited to join the video conference; the conference control center identifies the cluster user through the PDS.
  • the corresponding cluster terminal sends an invitation.
  • the cluster terminal that receives the invitation agrees to join the video conference, it returns an ACK response to the PDS and establishes a link with the PDS; the AT and the cluster terminal perform session interaction based on the link.
  • the session between the AT supporting the wireless video and the common cluster terminal in the wireless video conference system is realized, which satisfies the more abundant conference requirements of the user and improves the user experience.
  • FIG. 1 is a schematic diagram of a network structure of a wireless video conference system in the prior art
  • FIG. 2 is a schematic diagram of a network structure of a cluster system in the prior art
  • FIG. 3 is a schematic structural diagram of a session processing system according to the present invention.
  • FIG. 4 is a flowchart of an AT inviting a cluster terminal to join a conference according to an embodiment of the present invention
  • FIG. 5 is a flowchart 1 of a session interaction between an AT and a cluster terminal according to an embodiment of the present invention
  • FIG. 6 is a flowchart 2 of a session interaction between an AT and a cluster terminal according to an embodiment of the present invention.
  • the session processing system provided by the present invention adds the network architecture of the cluster system in the wireless video conferencing system, as shown in FIG.
  • the AT, the RAN, the PCN, and the conference control center connected through the IP network belong to the wireless video conference system; the cluster terminals, the BS, the PDC, and the PDS connected through the IP network belong to the cluster system.
  • the AT is used to encapsulate the cluster user identifier that is invited to join the video conference to the video conference tube.
  • the instructions for joining the cluster user carrying the video conference management information are sequentially passed.
  • the RAN, PCN and IP networks are sent to the conference control center.
  • the conference control center is configured to obtain a cluster user identifier by parsing the video conference management information, and send an invitation to the cluster terminal corresponding to the cluster user identifier by using the PDS.
  • the cluster terminal is configured to return an ACK response to the PDS and establish a link with the PDS when receiving the invitation and agreeing to join the video conference.
  • the PDS is used to forward the invitation from the conference control center to the cluster terminal, and after receiving the ACK response from the cluster terminal, establish a link with the cluster terminal; and after the link is successfully established, return an ACK response to the conference control center.
  • the AT and the cluster terminal are also used for session interaction based on the link between the cluster terminal and the PDS, and specifically include the following two aspects:
  • the conference control center splits the received multimedia data into a video stream and an audio stream, and sends the split audio stream to the PDS.
  • the PDS forwards the received audio stream to the cluster terminal in the video conference.
  • the PDS determines whether the cluster terminal belongs to the video conference. If it is determined that the cluster terminal belongs to the video conference, the received voice data is sent to the conference control center and other video conferences.
  • Cluster terminal; the conference control center encapsulates the received voice data into an audio stream in a multimedia format, and sends the audio stream to the AT in the video conference.
  • FIG. 4 is a flowchart of an AT inviting a cluster terminal to join a conference according to an embodiment of the present invention, where the process mainly includes the following steps:
  • Step 401 The AT supporting the wireless video will need to join the cluster user identification seal of the video conference.
  • the video conference management information is sent to the conference control center through the RAN, PCN, and IP network.
  • the AT supporting the wireless video must have the management right to add the user to the conference, and the video conference is in the convening.
  • the video conference management information can be sent to the conference control center through signaling or other means, such as joining the cluster user command.
  • the cluster user ID can be a cluster user number, but it is not limited to the cluster user number or it can be expanded to other forms.
  • Step 402 After receiving the video conference management information, the conference control center parses and obtains the cluster user identifier in the management information, and further knows that the AT sends the cluster user command.
  • Step 403 The conference control center determines a corresponding cluster terminal according to the cluster user identifier
  • the PDS sends a request to join the cluster terminal request, which includes the cluster terminal information requesting to join the video conference.
  • Step 404 After receiving the request command from the conference control center, the PDS parses the cluster terminal information in the request command, and sends an invitation to the corresponding cluster terminal through the IP network, the PDC, and the BS according to the cluster terminal information, and invites the cluster terminal to join. video conference.
  • Step 405 If the cluster terminal that receives the invitation agrees to join the video conference, it returns an ACK response to the PDS to join, and if it does not agree to join the video conference, returns a NACK response that does not agree to join the PDS.
  • the cluster terminal that receives the invitation agrees to join the video conference, it continues to perform the operations of the subsequent steps 406-407; if it does not agree to join the video conference, it returns a NACK response to the PDS, and the PDS forwards the NACK response to the conference control.
  • the center, the conference control center sends a NACK response to the AT through the IP network, PCN, and PAN.
  • Step 406 The cluster terminal that agrees to join the video conference sends a connection establishment request to the PDS.
  • Step 407 After receiving the connection establishment request, the PDS allocates resources for the cluster terminal, and after the link with the cluster terminal is successfully established, sends an ACK to the conference control center to join the conference successfully. Should. At this point, the cluster terminal joins the video conference, and the cluster terminal can perform two-way session communication with the AT.
  • FIG. 5 is a process flow of the AT to the cluster terminal in the process of session interaction, which mainly includes the following steps:
  • Step 501 The AT sends the multimedia data to the conference control center through the RAN, the PCN, and the IP network in sequence. After receiving the multimedia data from the AT, the conference control center splits the multimedia data into a video stream and an audio stream.
  • Step 502 The conference control center sends the split audio stream to the PDS.
  • Step 503 The PDS sends the received audio stream to the cluster terminal.
  • the conference control center when forwarding to other ATs in the video conference, the conference multimedia center does not need to perform splitting, and directly forwards the received multimedia data to other ATs;
  • the cluster terminal forwards, it needs to be split, and the split audio stream is sent to the PDS, which is then forwarded to the cluster terminal by the PDS.
  • FIG. 6 is a process flow of the cluster terminal to the AT direction during the session interaction process, which mainly includes the following steps:
  • Step 601 The cluster terminal sends the collected voice data to the PDS.
  • Step 602 The PDS determines, according to the cluster terminal information stored by the PDS, whether the cluster terminal is in the wireless video conference, and if yes, sends the voice data to the conference control center and other cluster terminals located in the conference.
  • Step 603 After receiving the voice data from the PDS, the conference control center encapsulates the voice data into a multimedia format, and then sends the audio stream in the multimedia format to the AT in the video conference.
  • the PDS refuses to perform the forwarding of the voice data.
  • the session processing method and system of the present invention implements a session between the AT supporting the wireless video and the ordinary cluster terminal in the wireless video conference system, and satisfies the user more abundantly. Rich conference needs have improved the user experience.

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

Abstract

本发明公开了一种会话处理方法，包括：支持无线视频的无线接入终端（AT）向会议控制中心发送加入集群用户指令，该指令中包括邀请加入视频会议的集群用户标识；会议控制中心通过集群调度服务器（PDS）向集群用户标识所对应的集群终端发送邀请；接收到邀请的集群终端在同意加入视频会议时，向PDS返回确认（ACK）响应，并与PDS之间建立链接；AT和集群终端基于所述链接进行会话交互。本发明还公开了一种会话处理系统。通过本发明的方法和系统，实现了无线视频会议系统中支持无线视频的AT与普通集群终端之间的会话。

Description

一种会话处理方法和系统 技术领域
本发明涉及无线通信领域的会话技术， 尤其涉及一种会话处理方法和 系统。 背景技术
随着无线宽带网络的广泛商用， 无线视频功能逐渐被用户熟知。 无线 宽带网络的高速数据传输链路， 为无线接入终端（AT, Access Terminal )的 大流量数据传输提供了保障。 AT具有采集视频数据和音频数据的功能， 且 能通过无线接入网（ RAN， Radio Access Network )连接到分组核心网（ PCN, Packet Core Network ), 进而接入无线宽带网络系统。
无线视频会议系统是在无线宽带网络系统的基础上发展而来的， 其网 络结构如图 1所示， AT通过 RAN、 PCN、互联网协议（IP, Internet Protocol ) 网络与会议控制中心建立链路， 该链路能够双向传递无线视频会议的媒体 数据和控制信息， 媒体数据包括视频流和音频流； AT具有采集媒体数据的 能力， 且 AT与 RAN之间通过空中接口 （UM )协议传输数据， PCN与会 议控制中心之间通过传输控制协议 ( TCP, Transmission Control Protocol ) /IP协议传输数据； 会议控制中心具有接收和分发媒体数据流， 以及通过空 口信令邀请 AT加入与退出视频会议的功能。
上述的无线视频会议系统， 实现了支持无线视频的 AT间进行会议， 但 随着用户体验度的不断提升，有时用户希望支持无线视频的 AT能与普通集 群终端间进行会话， 以满足更加丰富的会议需要。 现有的集群系统如图 2 所示， 集群终端间通过基站 （BS, Base Station )、 集群调度客户端 （PDC, PTT Dispatch Client ), 集群调度服务器 （ PDS， PTT Dispatch Server )和 IP 网络传递数据， 集群终端接受 PDS的调度。 目前， 由于集群终端无法解析 无线视频会议传输的视频流，而且集群终端与支持无线视频的 AT并不直接 处于相同的网络，因此还无法实现支持无线视频的 AT与普通集群终端之间 的会话。 发明内容
有鉴于此， 本发明的主要目的在于提供一种会话处理方法和系统， 以 实现无线视频会议系统中支持无线视频的 AT与普通集群终端之间的会话。
为达到上述目的， 本发明的技术方案是这样实现的：
本发明提供了一种会话处理方法， 该方法包括：
支持无线视频的无线接入终端 （AT ) 向会议控制中心发送加入集群用 户指令， 所述指令中包括邀请加入视频会议的集群用户标识；
所述会议控制中心通过集群调度服务器（ PDS )向集群用户标识所对应 的集群终端发送邀请；
接收到邀请的集群终端在同意加入视频会议时， 向所述 PDS返回确认 ( ACK )响应， 并与所述 PDS之间建立链接；
所述 AT和集群终端基于所述链接进行会话交互。
在 AT和集群终端基于所述链接进行会话交互中， 从 AT到集群终端方 向的会话处理具体为：
AT将多媒体数据依次通过无线接入网 （RAN )、 分组核心网 （PCN ) 和 IP网络发送给会议控制中心；
所述会议控制中心将接收的多媒体数据拆分成视频流和音频流， 并将 拆分出的音频流发送到 PDS；
所述 PDS将接收到的音频流转发给视频会议中的集群终端。
在 AT和集群终端基于所述链接进行会话交互中， 从集群终端到 AT方 向的会话处理具体为： 集群终端将语音数据发送到 PDS;
所述 PDS在确定所述集群终端属于视频会议中时， 将接收的语音数据 发送到会议控制中心和其他属于所述视频会议的集群终端；
所述会议控制中心将接收的语音数据封装成多媒体格式的音频流， 并 将所述音频流发送到视频会议中的 AT。
所述 AT向会议控制中心发送加入集群用户指令， 具体为：
所述 AT 将邀请加入视频会议的集群用户标识封装到视频会议管理信 息中， 并将携带有视频会议管理信息的加入集群用户指令依次通过 RAN、 PCN和 IP网络发送给会议控制中心；
在所述 AT向会议控制中心发送加入集群用户指令之后，所述会议控制 中心通过对视频会议管理信息解析得到所述集群用户标识。
该方法进一步包括：
接收到邀请的集群终端在不同意加入视频会议时， 向所述 PDS返回否 认（ NACK )响应 , 所述 PDS将 NACK响应转发给会议控制中心 , 会议控 制中心再依次通过 IP网络、 PCN、 PAN发送所述 NACK响应给 AT。
本发明还提供了一种会话处理系统，该系统包括：支持无线视频的 AT、 会议控制中心、 PDS和集群终端， 其中，
所述 AT, 用于向会议控制中心发送加入集群用户指令， 所述指令中包 括邀请加入视频会议的集群用户标识；
所述会议控制中心， 用于通过 PDS向集群用户标识所对应的集群终端 发送邀请；
所述集群终端，用于在接收到邀请且同意加入视频会议时，向所述 PDS 返回 ACK响应 , 并与所述 PDS之间建立链接；
所述 PDS , 用于将来自会议控制中心的邀请转发给集群终端， 在接收 到来自集群终端的 ACK响应后， 与集群终端之间建立链接； 并在链接建立 成功后， 向会议控制中心返回 ACK响应；
所述 AT和集群终端还用于基于所述链接进行会话交互。
所述 AT进一步用于，将自身在会话过程中产生的多媒体数据依次通过 RAN, PCN和 IP网络发送给会议控制中心；
相应的， 所述会议控制中心进一步用于， 将接收的多媒体数据拆分成 视频流和音频流， 并将拆分出的音频流发送到 PDS；
所述 PDS进一步用于， 将接收到的音频流转发给视频会议中的集群终 端。
所述集群终端进一步用于， 将自身在会话过程中产生的语音数据发送 到 PDS;
相应的， 所述 PDS进一步用于， 在确定所述集群终端属于视频会议中 时， 将接收的语音数据发送到会议控制中心和其他属于所述视频会议的集 群终端；
所述会议控制中心进一步用于， 将接收的语音数据封装成多媒体格式 的音频流， 并将所述音频流发送到视频会议中的 AT。
所述 AT进一步用于，将邀请加入视频会议的集群用户标识封装到视频 会议管理信息中， 并将携带有视频会议管理信息的加入集群用户指令依次 通过 RAN、 PCN和 IP网络发送给会议控制中心；
相应的， 所述会议控制中心进一步用于， 通过对视频会议管理信息解 析得到所述集群用户标识。
所述集群终端进一步用于， 在接收到邀请但不同意加入视频会议时， 向所述 PDS返回 NACK响应；
相应的， 所述 PDS进一步用于， 将所述 NACK响应转发给会议控制中 心；
所述会议控制中心进一步用于， 依次通过 IP网络、 PCN、 PAN发送所 述 NACK响应给 AT。
本发明所提供的一种会话处理方法和系统，由支持无线视频的 AT向会 议控制中心发送加入集群用户指令， 指令中包括邀请加入视频会议的集群 用户标识； 会议控制中心通过 PDS向集群用户标识所对应的集群终端发送 邀请； 接收到邀请的集群终端在同意加入视频会议时， 向 PDS返回 ACK 响应， 并与 PDS之间建立链接； AT和集群终端基于该链接进行会话交互。
通过本发明的方法和系统， 实现了无线视频会议系统中支持无线视频 的 AT与普通集群终端之间的会话， 满足了用户更加丰富的会议需求， 提升 了用户的体验度。 附图说明
图 1为现有技术中无线视频会议系统的网络结构示意图；
图 2为现有技术中集群系统的网络结构示意图；
图 3为本发明一种会话处理系统的组成结构示意图；
图 4为本发明实施例中 AT邀请集群终端加入会议的流程图；
图 5为本发明实施例中 AT与集群终端进行会话交互的流程图一； 图 6为本发明实施例中 AT与集群终端进行会话交互的流程图二。 具体实施方式
下面结合附图和具体实施例对本发明的技术方案进一步详细阐述。 为实现无线视频会议系统中支持无线视频的 AT 与普通集群终端之间 的会话， 本发明所提供的会话处理系统在无线视频会议系统中增加了集群 系统的网络架构，如图 3所示。该会话处理系统中，通过 IP网络相连的 AT、 RAN, PCN和会议控制中心属于无线视频会议系统的组成； 通过 IP网络相 连的集群终端、 BS、 PDC和 PDS属于集群系统的组成。
其中， AT用于将邀请加入视频会议的集群用户标识封装到视频会议管 理信息中， 并将携带有视频会议管理信息的加入集群用户指令依次通过
RAN, PCN和 IP网络发送给会议控制中心。
会议控制中心， 用于通过对视频会议管理信息解析得到集群用户标识， 并通过 PDS向集群用户标识所对应的集群终端发送邀请。
集群终端，用于在接收到邀请且同意加入视频会议时，向 PDS返回 ACK 响应， 并与 PDS之间建立链接。
PDS 用于将来自会议控制中心的邀请转发给集群终端， 在接收到来自 集群终端的 ACK响应后，与集群终端之间建立链接；并在链接建立成功后， 向会议控制中心返回 ACK响应。
AT和集群终端还用于基于集群终端与 PDS之间的链接进行会话交互， 具体包括以下两方面：
1、 当 AT将多媒体数据依次通过 RAN、 PCN和 IP网络发送到会议控 制中心时， 会议控制中心将接收的多媒体数据拆分成视频流和音频流， 并 将拆分出的音频流发送到 PDS; PDS将接收到的音频流转发给视频会议中 的集群终端。
2、 在集群终端将语音数据发送到 PDS 时， PDS判断该集群终端是否 属于视频会议中， 如果判断该集群终端属于视频会议中， 则将接收的语音 数据发送到会议控制中心和其他属于视频会议的集群终端； 会议控制中心 将接收的语音数据封装成多媒体格式的音频流， 并将音频流发送到视频会 议中的 AT。
下面结合图 3 所示的会话处理系统， 对本发明的会话处理方法进一步 详细阐述。
首先如图 4所示，图 4为本发明实施例中 AT邀请集群终端加入会议的 流程图， 该流程主要包括以下步骤：
步骤 401 , 支持无线视频的 AT将需要加入视频会议的集群用户标识封 装到视频会议管理信息中， 并通过 RAN、 PCN、 IP网络将视频会议管理信 息发送到会议控制中心。
需要说明的是，该支持无线视频的 AT必须具有添加用户到会议的管理 权限， 且该视频会议处于召开中。 视频会议管理信息可以通过信令或其他 方式发送给会议控制中心， 如加入集群用户指令。 集群用户标识可以为集 群用户号码， 但并非仅限于集群用户号码的形式， 也可以扩展为其他的形 式。
步骤 402,会议控制中心接收到视频会议管理信息后， 解析得到管理信 息中的集群用户标识， 进而获知 AT发送的是加入集群用户指令。
步骤 403 ,会议控制中心根据集群用户标识确定对应的集群终端， 并向
PDS 发送加入集群终端请求指令， 该指令中包括请求加入视频会议的集群 终端信息。
步骤 404, PDS接收到来自会议控制中心的请求指令后，解析得到请求 指令中的集群终端信息， 并根据该集群终端信息通过 IP 网络、 PDC、 BS 发送邀请到对应的集群终端， 邀请集群终端加入视频会议。
步骤 405 , 接收到邀请的集群终端如果同意加入视频会议， 则向 PDS 返回同意加入的 ACK响应； 如果不同意加入视频会议， 则向 PDS返回不 同意加入的 NACK响应。
需要说明的是， 接收到邀请的集群终端如果同意加入视频会议， 则继 续执行后续步骤 406~407的操作； 如果不同意加入视频会议， 则向 PDS返 回 NACK响应 , PDS将 NACK响应转发给会议控制中心 ,会议控制中心再 依次通过 IP网络、 PCN、 PAN发送 NACK响应给 AT。
步骤 406, 同意加入视频会议的集群终端向 PDS发送建立连接请求。 步骤 407 ,接收到建立连接请求后， PDS为集群终端分配资源， 并在与 集群终端的链路建立成功后， 向会议控制中心发送加入会议成功的 ACK响 应。 至此， 集群终端加入到视频会议中， 集群终端可以与 AT之间进行双向 会话通信。
再如图 5所示， 图 5为会话交互过程中， AT到集群终端方向的处理流 程， 主要包括以下步骤：
步骤 501 , AT将多媒体数据依次通过 RAN、 PCN和 IP网络发送给会 议控制中心； 会议控制中心接收到来自 AT的多媒体数据后， 将该多媒体数 据拆分成视频流和音频流。
步骤 502, 会议控制中心将拆分出的音频流发送到 PDS。
步骤 503 , PDS将接收到的音频流发送到集群终端。
需要说明的是， 会议控制中心接收到来自 AT的多媒体数据后， 在向视 频会议中的其他 AT转发时， 无需进行拆分， 直接将接收的多媒体数据转发 给其他 AT; 在向视频会议中的集群终端转发时， 才需要进行拆分， 并将拆 分出的音频流发送到 PDS , 由 PDS再转发给集群终端。
如图 6所示，图 6为会话交互过程中，集群终端到 AT方向的处理流程， 主要包括以下步骤：
步骤 601 , 集群终端将釆集到的语音数据发送到 PDS。
步骤 602, PDS根据自身存储的集群终端信息，判断该集群终端是否处 于无线视频会议中， 如果是， 则将语音数据发送到会议控制中心和其他处 于该会议的集群终端。
步骤 603 , 会议控制中心接收到来自 PDS的语音数据后， 将该语音数 据封装成多媒体格式，然后将多媒体格式的音频流发送到视频会议中的 AT。
需要说明的是， 如果判断发送语音数据的集群终端不是处于无线视频 会议中， 则 PDS拒绝执行语音数据的转发。
综上所述， 通过本发明的会话处理方法和系统， 实现了无线视频会议 系统中支持无线视频的 AT与普通集群终端之间的会话，满足了用户更加丰 富的会议需求， 提升了用户的体验度。
以上所述， 仅为本发明的较佳实施例而已， 并非用于限定本发明的保 护范围。

Claims

权利要求书
1、 一种会话处理方法， 其特征在于， 该方法包括：
支持无线视频的无线接入终端 （AT ) 向会议控制中心发送加入集群用 户指令， 所述指令中包括邀请加入视频会议的集群用户标识；
所述会议控制中心通过集群调度服务器（ PDS )向集群用户标识所对应 的集群终端发送邀请；
接收到邀请的集群终端在同意加入视频会议时， 向所述 PDS返回确认 ( ACK )响应， 并与所述 PDS之间建立链接；
所述 AT和集群终端基于所述链接进行会话交互。
2、 根据权利要求 1所述会话处理方法， 其特征在于， 在 AT和集群终 端基于所述链接进行会话交互中， 从 AT 到集群终端方向的会话处理具体 为：
AT将多媒体数据依次通过无线接入网 （RAN )、 分组核心网 （PCN ) 和 IP网络发送给会议控制中心；
所述会议控制中心将接收的多媒体数据拆分成视频流和音频流， 并将 拆分出的音频流发送到 PDS；
所述 PDS将接收到的音频流转发给视频会议中的集群终端。
3、 根据权利要求 1所述会话处理方法， 其特征在于， 在 AT和集群终 端基于所述链接进行会话交互中， 从集群终端到 AT 方向的会话处理具体 为：
集群终端将语音数据发送到 PDS;
所述 PDS在确定所述集群终端属于视频会议中时， 将接收的语音数据 发送到会议控制中心和其他属于所述视频会议的集群终端；
所述会议控制中心将接收的语音数据封装成多媒体格式的音频流， 并 将所述音频流发送到视频会议中的 AT。
4、 根据权利要求 1、 2或 3所述会话处理方法， 其特征在于， 所述 AT 向会议控制中心发送加入集群用户指令， 具体为：
所述 AT 将邀请加入视频会议的集群用户标识封装到视频会议管理信 息中， 并将携带有视频会议管理信息的加入集群用户指令依次通过 RAN、 PCN和 IP网络发送给会议控制中心；
在所述 AT向会议控制中心发送加入集群用户指令之后，所述会议控制 中心通过对视频会议管理信息解析得到所述集群用户标识。
5、 根据权利要求 1、 2或 3所述会话处理方法， 其特征在于， 该方法 进一步包括：
接收到邀请的集群终端在不同意加入视频会议时， 向所述 PDS返回否 认（ NACK )响应 , 所述 PDS将 NACK响应转发给会议控制中心 , 会议控 制中心再依次通过 IP网络、 PCN、 PAN发送所述 NACK响应给 AT。
6、一种会话处理系统，其特征在于，该系统包括： 支持无线视频的 AT、 会议控制中心、 PDS和集群终端， 其中，
所述 AT, 用于向会议控制中心发送加入集群用户指令， 所述指令中包 括邀请加入视频会议的集群用户标识；
所述会议控制中心， 用于通过 PDS向集群用户标识所对应的集群终端 发送邀请；
所述集群终端，用于在接收到邀请且同意加入视频会议时，向所述 PDS 返回 ACK响应 , 并与所述 PDS之间建立链接；
所述 PDS , 用于将来自会议控制中心的邀请转发给集群终端， 在接收 到来自集群终端的 ACK响应后， 与集群终端之间建立链接； 并在链接建立 成功后， 向会议控制中心返回 ACK响应；
所述 AT和集群终端还用于基于所述链接进行会话交互。
7、 根据权利要求 6所述会话处理系统， 其特征在于， 所述 AT进一步 用于， 将自身在会话过程中产生的多媒体数据依次通过 RAN、 PCN和 IP 网络发送给会议控制中心；
相应的， 所述会议控制中心进一步用于， 将接收的多媒体数据拆分成 视频流和音频流， 并将拆分出的音频流发送到 PDS；
所述 PDS进一步用于， 将接收到的音频流转发给视频会议中的集群终 端。
8、 根据权利要求 6所述会话处理系统， 其特征在于， 所述集群终端进 一步用于， 将自身在会话过程中产生的语音数据发送到 PDS;
相应的， 所述 PDS进一步用于， 在确定所述集群终端属于视频会议中 时， 将接收的语音数据发送到会议控制中心和其他属于所述视频会议的集 群终端；
所述会议控制中心进一步用于， 将接收的语音数据封装成多媒体格式 的音频流， 并将所述音频流发送到视频会议中的 AT。
9、 根据权利要求 6、 7或 8所述会话处理系统， 其特征在于， 所述 AT 进一步用于， 将邀请加入视频会议的集群用户标识封装到视频会议管理信 息中， 并将携带有视频会议管理信息的加入集群用户指令依次通过 RAN、 PCN和 IP网络发送给会议控制中心；
相应的， 所述会议控制中心进一步用于， 通过对视频会议管理信息解 析得到所述集群用户标识。
10、 根据权利要求 6、 7或 8所述会话处理系统， 其特征在于， 所述集 群终端进一步用于， 在接收到邀请但不同意加入视频会议时， 向所述 PDS 返回 NACK响应；
相应的， 所述 PDS进一步用于， 将所述 NACK响应转发给会议控制中 心；
所述会议控制中心进一步用于， 依次通过 IP网络、 PCN、 PAN发送所 述 NACK响应给 AT。
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US8803942B2 (en) 2014-08-12

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