TIA-926-2002 Circuit Switched Video Conferencing Services《电路交换视频会议业务》.pdf
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1、TIA DOCUMENT Circuit Switched Video Conferencing Services TIA-926 DECEMBER 2002 TELECOMMUNICATIONS INDUSTRY ASSOCIATION The Telecornmunicalions Industry Assodalion represents lhe cornmunicalions mor o Electrcriic Industries Alliance NOTICE TIA Engineering Standards and Publications are designed to s
2、erve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for their particular need. The existence of s
3、uch Publications shall not in any respect preclude any member or non-member of TIA fiom manufacturing or selling products not conforming to such Publications. Neither shall the existence of such Documents preclude their voluntary use by non-TIA members, either domestically or internationally. TIA DO
4、CUMENTS TIA Documents contain information deemed to be of technical value to the industry, and are published at the request of the originating Committee without necessarily following the rigorous public review and resolution of comments which is a procedural part of the development of a American Nat
5、ional Standard (ANS). TIA documents shall be reviewed on a five year cycle by the formulating Committee and a decision made on whether to reaffii, revise, withdraw, or proceed to develop an American National Standard on this subject. Suggestions for revision should be directed to: Standards General
6、Description 31 23. TS 26.110 Codec for Circuit switched Multimedia Telephony Service; General 32 Description (Version 5.0.0), June 2002 33 24. TS 26.111 Codec for Circuit switched Multimedia Telephony Service; 34 Modifications to H.324 (version 5.0.0), June 2002 1-2 TIA-926 I 1.3. Abbreviations z Fo
7、r the purpose of this document, the following abbreviations apply: 3 3G Third Generation system 3GPP2 3GPP-324M Terminal compliant with 23, 241 BLOB BLock Of Bits. Third Generation Partnership Project 2 Mobile Station for 3GPP Circuit-Switched Video Conferencing BS BSAP 10s 10s Al 10s A2 Base Statio
8、n. A fixed station used for communicating with mobile stations. Depending upon the context, the term base station may refer to a cell, a sector within a cell, or other part of the wireless system. Base Station Application Part. The application layer signaling protocol that provides messaging to acco
9、mplish the functions of the 10s Al Interface component of the MSC-BS Interface. Inter-Operability Specification for interfaces between an MSC and a BS (see i). The 10s interface that carries signaling information between the Call Control (CC) and Mobility Management (MM) functions of the MSC and the
10、 call control component of the BS (BSC). The 10s interface that carries 64/56 kbps PCM information (voice/data) between the Switch component of the MSC and the Selection/Distribution Unit (SDU) function of the BS (BSC). ISUP ISDN User Part IWF Interworking Function. In this document, this refers spe
11、cifically to the interworking between different speech codecs (e.g., EVRC and 3GPP-AMR). Mobile Station A station in the Public Cellular Radio Telecommunications Service intended to be used while in motion or during halts at unspecified points. Mobile stations include portable units (e.g., hand-held
12、 personal units) and units installed in vehicles. MS MSC QOS QoS BLOB Mobile Station Mobile Switching Center Quality of Service. The set of parameters and procedures associated with a service indicating the capabilities and constraints related to the delivery of the service. The set of QoS parameter
13、s exchanged via cdma2000 signaling that defines the QoS context for a particular service instance. 1-3 TIA-926 RC RLP RLP-BLOB Radio Configuration. A set of Forward Traffic Channel and Reverse Traffic Channel transmission formats that are characterized by physical layer parameters such as transmissi
14、on rates, modulation characteristics, and spreading rate. Radio Link Protocol The set of RLP parameters that defines the RLP configuration (e.g., retransmission scheme, round trip time) 1-4 TIA-926 I 2. OVERVIEW OF VIDEO CONFERENCING SERVICES 2 2.1. General Descriptions 3 4 Service options 57 and 58
15、 provide video conferencing services capable of 5 transferring multiplex audio, video and control data at speeds of 32 and 64 kbps 6 respectively, over the air-interface (Um) between mobile stations and other 7 terminals. 8 9 10 11 and ISUP signaling. 12 13 14 15 16 17 18 19 The document defines poi
16、nt-to-point video conferencing services. Service options 57 and 58 use the Radio Link Protocol defined in 101 to provide an octet stream transport service over forward and reverse traffic channels. The MSC provides the protocol conversion between cdma2000 upper layer signaling Above the Radio Link P
17、rotocol, the ITU-T H.324 21 group of protocols is used for the video conferencing service. ITU-T H.245 is used for conducting capability exchange and negotiations between the terminals, and for opening and closing of logical channels and other components of the video conferencing services. ITU-T H.2
18、23 16, 17, 181 is used for multiplexing/demultiplexing video, audio and control data. The NSRP and CCSRL protocols defined in Annex C of ITU-T H.324 are used to transport the H.245 control messages reliably over the H.223 multiplex layer. Interoperability with other networks, such as the 3GPP networ
19、k, is provided. 20 21 The mobile station uses the encoders and decoders, and multiplexer specified in 22 section 4. Input/output (I/O) interfaces for video, audio, and system control 23 provided in the mobile station are out of scope of this specification. 24 The sending function in the mobile stati
20、on encodes the data from each media source 25 with the corresponding visual and audio encoder. The output of the encoders and 26 the system control interface are multiplexed and sent to transport layer of the 27 underlying wireless network. 28 The receiving function in the mobile station de-multiple
21、xes the received data stream, 29 and decodes the data with the corresponding video and audio decoders. The output 30 is then sent to be played at local visual and audio players (see Figure 1). 31 After the Um interface has been established, control messages defined in 19 are 32 used for video confer
22、encing call setup procedures and for controlling other 33 components specified in section 4. 2.2. Structure of the Video Conferencing Service System in the MS 2- I TIA-926 1 2 3 4 5 6 7 8 9 10 11 12 13 14 e of video Conferencing Figure 2- 1 Scope and Structure of Circuit-Switched Video Conferencing
23、Services 2.3. Video Conferenchg Service Protocol Stack Reference Model The video conferencing service architecture is defined by the protocols used across the different interface points. Figure 2-2 depicts the video conferencing service protocol stack for establishing the required bearer on the cdma
24、2000 wireless link. Mobile Station Base Station MSC Figure 2-2 cdma2000 Bearer Call Setup Protocol Stack Figure 2-3 depicts the protocol stack for the video conferencing bearer after establishing the cdma2000 wireless link. 2-2 TIA-926 11.223 frame R1.P cdma20 Mobile Station _. i Rate Adaptation Pro
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