TIA-924-A-2009 Packet Switched Video Telephony Services (PSVT)《分组交换可视电话服务(psvt)》.pdf

1、 TIA-924-A-2009 APPROVED: FEBRUARY 1, 2009 REAFFIRMED: MARCH 16, 2014 TIA-924-A (Revision of TIA-924) February 2009Packet Switched Video Telephony Services (PSVT) NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between

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19、 CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. TIA 924-A i PREFACE This document provides the service description for Packet Switched Video Telephony (PSVT) services operating over cdma2000 networks. TIA 924-A ii CONTENTS Scope vii 1 Introduction 1 2 Ref

20、erences2 2.1 Normative References 2 2.2 Informative References 4 3 Definitions and Abbreviations5 3.1 Abbreviations .5 4 Overview (Informative)6 4.1 Network Reference Model for PSVT.6 4.2 Network Reference Model for PSVT over IMS.8 4.3 RAN and PDSN Protocol Stacks10 4.4 IP Protocol Stack11 5 Call Si

21、gnaling.13 5.1 Feature Initialization 13 5.2 Call Origination and Reception (Informative)14 5.2.1 Radio Bearer Establishment and SIP Signaling.14 5.3 Call Release (Informative) .17 5.4 In-Call Media Management (Informative) .19 5.4.1 Adding Bi-Directional Video to a VoIP Call.19 5.4.2 Removing Bi-Di

22、rectional Video from a PSVT Call 22 5.5 Session Description Protocol (SDP) Parameters (Informative)25 5.5.1 SDP Offer 25 5.5.2 SDP Answer 26 6 Media27 6.1 Codecs 27 6.1.1 Video .27 6.1.2 Voice27 6.2 Transport 27 6.2.1 Header Compression28 6.2.2 Media Synchronization28 7 Quality of Service (QoS)29 7.

23、1 Radio Link QoS Configuration and Activation29 7.1.1 Configuring QoS Reservations 29 7.1.2 Activating QoS at Call Origination31 7.1.3 Activating QoS at Call Answering 32 7.1.4 QoS Adjustments at the Calling and Answering Terminals 32 TIA 924-A iii 8 Error Resiliency .33 8.1 Packet and Picture Loss

24、Indication.33 8.1.1 SDP Definitions 33 8.1.2 Operation 34 8.1.2.1 GNACK .34 8.1.2.2 PLI .34 8.1.3 Feedback Rate.34 9 Adaptation35 9.1 Rate Adaptation Feedback Message.35 9.1.1 General Semantics for Using APTO_ARR Message.36 9.2 SDP Definitions .36 9.2.1 SDP Offer 37 9.2.2 SDP Answer 37 9.2.3 Multipl

25、e Payload Types.40 10 Security and Encryption.41 11 PSVT Session Handling for HRPD to cdma2000 1xCS Domain Transfer 42 11.1 PSVT terminal roles for registration in HRPD.42 11.2 PSVT terminal roles for Call Origination 42 11.3 PSVT terminal roles during Call Termination .42 11.4 PSVT terminal roles d

26、uring Domain Transfer (DT) 42 11.4.1 Releasing Video media of the ongoing PSVT session during DT.42 11.4.2 PSVT HRPD voice to cdma2000 1xCS voice DT.43 12 Annex A - QoS BLoB (Informative)44 13 Annex B - Call Flow Examples for Supplementary Services and Functions (Informative).51 13.1 PSVT Voice Retr

27、y51 13.1.1 Retry PSVT Call Origination as VoIP.51 13.1.2 Retry PSVT Call Reception as VoIP .53 13.1.3 Retry PSVT Call Origination as 1x Circuit-Switched Voice.56 13.1.4 Retry PSVT Call Reception as 1x Circuit-Switched Voice.57 13.2 Video/Media on Hold.60 14 ANNEX C - SDP Offer/Answer Examples for th

28、e b=AS and b=TIAS SDP Parameters (Informative) 64 TIA 924-A iv LIST OF FIGURES Figure 1 Network Reference Model for non-IMS Mobile-to-Mobile PSVT Call . 6 Figure 2 Network Reference Model for non-IMS Mobile-to-Internet Correspondent Node PSVT Call. 7 Figure 3 Network Reference Model for Mobile-to-Mo

29、bile PSVT using IMS. 8 Figure 4 Network Reference Model for Mobile-to-Internet Correspondent Node PSVT using IMS 9 Figure 5 Protocol Stack when HDLC framing is applied 10 Figure 6 Protocol Stack when segment-based framing is applied . 11 Figure 7 PSVT Protocol Stacks over IP. 12 Figure 8 Call Flow f

30、or PSVT Feature Initialization 14 Figure 9 Call Origination and Reception for 3GPP2 PSVT Terminals . 15 Figure 10 Call Release for 3GPP2 PSVT Terminals . 18 Figure 11 Call Flow for Adding Video to VoIP Call. 20 Figure 12 Call Flow for User-Initiated Removal of Video Stream from PSVT Call. 22 Figure

31、13 Call Flow for Network-Initiated Removal of Video Stream from PSVT Call 24 Figure 14 Call Flow for Retry PSVT Call Origination as VoIP . 52 Figure 15 Call Flow for Retry PSVT Call Reception as VoIP . 54 Figure 16 Call Flow for Retry PSVT Call Origination as 1x CS Voice . 56 Figure 17 Call Flow for

32、 Retry PSVT Call Reception as 1x CS Voice 58 Figure 18 Call Flow for Video on Hold Feature 61 TIA 924-A v LIST OF TABLES Table 1 QoS Reservations for Multiple QoS_ATTRIBUTE_SETs .30 Table 2 Allowable setting of “apto-arr” parameter in SDP answer 39 Table 3 Example of Request QoS BLoB49 TIA 924-A vi

33、FOREWORD (This foreword is not part of this Standard.) The potential benefits of communicating via visual media, in addition to voice, have long been recognized as greatly enhancing the potential for users to communicate and to convey information. Video telephony allows users to simultaneously send

34、and receive voice and video images in real time. Video images may be captured by a local camera or previously stored locally for retrieval and transmission to the far end user. Visual images may be a sequence of video frames simulating smooth motion or intermittent still images, both photographic an

35、d graphical. A user can stop video communication without interrupting the voice conversation. Transmitting a video stream has proven to be a very challenging goal, since it requires significant resources, and therefore can place a heavy burden on the system. Because a video stream contains much more

36、 information than voice alone, it demands a much higher data rate. In order to reduce the data rate, many video codecs are optimized for maximum compression alone, and thus are sensitive to transmission errors. With the development of 3G wireless communications systems, the data rate available to ea

37、ch user can be considerably increased. The available network throughput has reached the threshold where reasonable quality video telephony services can be realized. As of late, new developments in packet (IP based) networks have made video telephony a more viable service due, in part, to the followi

38、ng: Standardization of comprehensive QoS capabilities in all variants of cdma20001wireless networks; Payload flexibility of packet switching and routing, which enables asymmetric and variable rate bearers; Optimization of wireline protocols for wireless networks (e.g. protocol header compression/rem

39、oval); Increase in number of devices (PCs and laptop computers) frequently attached to a network (wide area wireless, WLAN, or wired), in addition to the camera-equipped wireless phones. 1cdma2000 is the trademark for the technical nomenclature for certain specifications and standards of the Organiz

40、ational Partners (OPs) of 3GPP2. Geographically (and as of the date of publication), cdma2000 is a registered trademark of the Telecommunications Industry Association (TIA-USA) in the United States. TIA 924-A vii SCOPE This document specifies the end-to-end protocols and procedures for support of Pa

41、cket Switched Video Telephony (PSVT) Services over cdma2000 networks. This document defines the end-to-end PSVT service and architecture. The Stage 1 requirements for the PSVT Service are specified in 42. The end-to-end system design is described in 43. PSVT provides support of one-to-one conversati

42、onal video services between a PSVT Terminal and another PSVT Terminal or a video terminal on the Internet. The procedures specified in this document are based upon procedures in 12346789101213171819. If there is a conflict between the procedures in this document and those in the above referenced sta

43、ndards, the procedures in the referenced standards take precedence. In this document, several key words are used to signify the requirements. The key words “shall”, “shall not”, “should”, “should not” and “may” are to be interpreted as described in 20 and the TIA Engineering Style Manual. TIA 924-A

44、1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 viii No Text TIA 924-A 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 3

45、9 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 1 1 Introduction A PSVT call involves call signaling and media transmission. For a successful PSVT call, call signaling includes locating the callee, notifying the callee that a caller would like to initiate a PSVT call, acceptance by

46、the callee, and capabilities exchange. Media transmission requires the encoding of video, voice, and other media for transmission over a packet switched transport network. Encoding, especially in the case of video and usually for voice, often involves considerable compression (often lossy). To aid i

47、n the transmission of these compressed media streams, a predefined transmission format (e.g., RTP) is used. The receiving terminal must reconstruct the media streams from the incoming packets (which may be missing or out of order) and decode them. Typically, a terminal is encoding and decoding simul

48、taneously. The signaling protocols and encoding methods presented in this specification were selected to make the best possible use of the capabilities inherent in CDMA2000 networks while providing a high degree of interoperability with other networks. In no case is full interoperability precluded f

49、or those systems that include the additional signaling and codecs necessary to do so. Existing, well established technologies were chosen to ensure broad-based support. In anticipation of continued advancements in terminal capabilities, advanced technologies are supported as well. Additionally, the signaling methods utilized are extensible without revision of this specification or those it references.TIA 924-A 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50