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
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2 References
3 Definitions, symbols and abbreviations Word‑p. 7
4 Objectives and requirements
5 Codec mode/rate selection/adaptation Word‑p. 8
5.1 Identified problems of existing mechanisms
5.2 Design Principles
5.3 Use cases Word‑p. 9
5.3.1 Codec mode and rate selection at call setup
5.3.2 Codec rate adaptation during an on-going call
5.3.2.1 Uplink codec rate decrease
5.3.2.2 Downlink codec rate decrease Word‑p. 10
5.3.2.3 Uplink codec rate increase Word‑p. 11
5.3.2.4 Downlink codec rate increase Word‑p. 12
5.4 Candidate solutions Word‑p. 13
5.4.1 Dedicated RRC signaling based solution Word‑p. 14
5.4.2 Broadcast based bit rate adaptation
5.4.3 MAC Control Element
5.4.4 Application layer based solution Word‑p. 15
5.5 Evaluations and Conclusions
6 VoLTE/video enhancements to improve access and signalling Word‑p. 16
6.1 Identified problems of existing mechanisms
6.1.1 Prioritization of Voice/Video call access Word‑p. 17
6.1.2 Prioritization of Voice/Video call signaling
6.1.3 Mobility related issues
6.1.4 RAN related issues with conversational video calls Word‑p. 19
6.2 Potential solutions
6.2.1 Prioritization of Voice/Video call access
6.2.2 Signalling Enhancement to Support of Redirection Word‑p. 20
6.3 Evaluations and Conclusions Word‑p. 21
7 VoLTE/video enhancements to improve quality Word‑p. 22
7.1 Identified problems of existing mechanisms
7.1.1 Use case 1: Coverage enhancement
7.1.2 Use case 2: eNB codec mode awareness
7.1.3 Use case 3: UE preferred C-DRX Cycle reporting Word‑p. 23
7.2 Design Principles
7.3 Candidate solutions
7.3.1 Relaxing air interface delay budget
7.3.2 Packet aggregation Word‑p. 24
7.3.3 Techniques from CE mode A
7.4 Evaluations and Conclusions
8 Conclusions and Recommendations Word‑p. 25
A ECN-based codec rate adaptation mechanism Word‑p. 26
A.1 ECN-based codec rate selection at call set-up
A.2 ECN-based codec rate adaptation at on-going session
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