Content for TR 36.750 Word version: 14.1.0
2 References
3 Definitions, symbols and abbreviations
4 Objectives and requirements
5 Codec mode/rate selection/adaptation
6 VoLTE/video enhancements to improve access and signalling
7 VoLTE/video enhancements to improve quality
8 Conclusions and Recommendations
A ECN-based codec rate adaptation mechanism
$ Change History
2 References p. 6
3 Definitions, symbols and abbreviations p. 7
4 Objectives and requirements p. 7
5 Codec mode/rate selection/adaptation p. 8
5.1 Identified problems of existing mechanisms p. 8
5.2 Design Principles p. 8
5.3 Use cases p. 9
5.3.1 Codec mode and rate selection at call setup p. 9
5.3.2 Codec rate adaptation during an on-going call p. 9
5.4 Candidate solutions p. 13
5.4.1 Dedicated RRC signaling based solution p. 14
5.4.2 Broadcast based bit rate adaptation p. 14
5.4.3 MAC Control Element p. 14
5.4.4 Application layer based solution p. 15
5.5 Evaluations and Conclusions p. 15
6 VoLTE/video enhancements to improve access and signalling p. 16
6.1 Identified problems of existing mechanisms p. 16
6.1.1 Prioritization of Voice/Video call access p. 17
6.1.2 Prioritization of Voice/Video call signaling p. 17
6.1.3 Mobility related issues p. 17
6.1.4 RAN related issues with conversational video calls p. 19
6.2 Potential solutions p. 19
6.2.1 Prioritization of Voice/Video call access p. 19
6.2.2 Signalling Enhancement to Support of Redirection p. 20
6.3 Evaluations and Conclusions p. 21
7 VoLTE/video enhancements to improve quality p. 22
7.1 Identified problems of existing mechanisms p. 22
7.1.1 Use case 1: Coverage enhancement p. 22
7.1.2 Use case 2: eNB codec mode awareness p. 22
7.1.3 Use case 3: UE preferred C-DRX Cycle reporting p. 23
7.2 Design Principles p. 23
7.3 Candidate solutions p. 23
7.3.1 Relaxing air interface delay budget p. 23
7.3.2 Packet aggregation p. 24
7.3.3 Techniques from CE mode A p. 24
7.4 Evaluations and Conclusions p. 24
8 Conclusions and Recommendations p. 25
A ECN-based codec rate adaptation mechanism p. 26
A.1 ECN-based codec rate selection at call set-up p. 26
A.2 ECN-based codec rate adaptation at on-going session p. 26
$ Change History p. 28
