anber457 2006-8-4 16:27
Real-time Transport Protocol (RTP) usage model
【资料成文时间】：2004-04
【语言】：english
【页数】：44
【何人（公司）所著】：3GPP
【文件格式】：word
【文件原名】：26937-600.doc
【摘要或目录】：
Foreword 5
1 Scope 6
2 References 6
3 Definitions and abbreviations 7
3.1 Definitions 7
3.2 Abbreviations 7
4 Background and motivation 8
5 Overview 8
6 End-to-end PSS system 8
6.1 Multimedia content creation 9
6.1.1 CBR vs. VBR encoding for video 9
6.2 Streaming server media transmission 9
6.2.1 Transmission of VBR content over constant rate channels 9
6.2.2 Transport and Transmission 10
6.2.3 Packet Sizes 10
6.2.4 Adaptation capability 12
6.2.5 Clarification of using PSS Video Buffering Verifier in a rate adaptive service environment 13
6.2.5.1 Clarification of terms and concepts 13
6.2.5.2 Clarification of Annex G buffering parameters 14
6.2.5.2.1 What is mandatory? 15
6.2.5.2.2 Adaptive transmission curve-reception curve control 15
6.2.5.2.3 Why is it important to have a strict conformance point at the sampling curve-transmission curve control? 15
6.2.5.3 The resulting constraints and responsibilities 15
6.2.5.4 Example scenario relying on 3GPP QoS guarantees 15
6.2a Signalling for rate adaptation in Release 6 16
6.2a.1 Implementation of the signalling for rate adaptation 16
6.2a.2 Test results over EGPRS 17
6.2a.2.1 Parameters used for the simulation 17
6.2a.2.2 Results 18
6.3 UMTS QoS profile parameters 22
6.3.1 Guaranteed and maximum bitrate 22
6.3.2 SDU error ratio 22
6.3.3 Residual bit error rate 23
6.3.4 Maximum SDU size 23
6.4 Bearer and Layer 2 network protocols options 23
6.4.1 UTRAN streaming bearer implementation options 23
6.4.1.1 UTRAN RLC modes 23
6.4.1.2 Implications of RLC mode decision 24
6.4.1.3 Examples of bearers for PSS 24
6.4.2 GERAN streaming bearer implementation options 24
6.4.2.1 Iu and A/Gb modes 24
6.4.2.2 GERAN RLC modes 24
6.5 Network transport channel mapping 25
6.5.1 Dedicated or shared channel 25
6.5.2 Implications of channel mapping decision 25
6.5.3 HSDPA 26
6.5.4 EGPRS / GERAN 26
6.6 Core network 26
6.7 Streaming client 26
7 PSS characterisation 26
7.1 Comparison of different rate control strategies for video streaming 26
7.2 Streaming application traffic characteristics 29
7.2.1 Packet size statistics 31
7.2.2 Packet Bitrate statistics 33
7.3 UTRAN DCH with RLC Acknowledged Mode 35
7.4 Use cases for QoS profile settings 37
7.4.1 Voice only AMR streaming QoS profile 38
7.4.2 High quality voice/low quality music AMR-WB streaming QoS profile 38
7.4.3 Music only AAC streaming QoS profile 39
7.4.4 Voice and video streaming QoS profile 39
7.4.5 Voice and video streaming QoS profile for GPRS Rel. ‘97 40
7.5 Robust handover management 40
Annex A: Characterisation metrics and testing guidelines 42
Annex B: Change history 44