Content for TR 25.705 Word version: 13.0.0
4 Objectives
5 Scenarios and use cases
6 Study areas
6.1 Coverage enhancements
6.2 Signalling optimizations for small-data transmission
6.3 Support of massive number of devices
6.4 Device power saving enhancements
7 Impact on RAN WGs
8 Conclusions
A Power consumption model
$ Change History
4 Objectives p. 8
5 Scenarios and use cases p. 8
6 Study areas p. 9
6.1 Coverage enhancements p. 9
6.1.1 Reference scenario p. 9
6.1.2 Baseline evaluation results p. 10
6.1.2.1 Coverage evaluation results source I p. 10
6.1.2.2 Coverage evaluation results source II p. 11
6.1.3 Potential solutions p. 14
6.1.3.1 Larger TTI p. 14
6.1.3.2 TTI repetition p. 14
6.1.3.3 Power boosting p. 15
6.1.3.4 Increasing HARQ retransmissions p. 15
6.1.3.5 PRACH preamble coverage enhancements p. 15
6.1.3.5.1 Solutions of Repetitions with energy accumulation p. 15
6.1.3.5.2 Considerations on the PRACH preamble repetition schemes p. 19
6.1.3.5.3 Uplink optimization for small data transmission p. 20
6.1.3.6 PRACH message coverage enhancements p. 22
6.1.3.7 Enhanced uplink coverage enhancements p. 23
6.1.3.7.1 Analysis on the power cost for the EUL physical channels p. 23
6.1.3.7.2 Solution 1 to enhance the coverage of the EUL p. 24
6.1.3.7.3 Solution 2 to enhance the coverage of the EUL p. 25
6.1.3.7.4 Solution 3 to enhance the coverage of the EUL p. 26
6.1.3.7.5 Solution 4 to enhance the coverage of the EUL p. 27
6.1.3.7.6 Legacy aspects related to the coverage enhancements for EUL p. 28
6.1.3.7.7 HARQ process design for Solution 1 and Solution 2 p. 29
6.1.3.7.8 Summary of the solutions for EUL p. 30
6.1.3.8 PCH over S-CCPCH coverage enhancements p. 31
6.1.4 Considerations on selection of repetition number p. 37
6.1.5 Summary of the potential coverage enhancements p. 38
6.2 Signalling optimizations for small-data transmission p. 42
6.2.1 Signalling optimization on physical layer p. 42
6.2.1.1 Solutions of layer 1 signalling optimization p. 42
6.2.1.2 Evaluations on signalling optimization p. 43
6.2.2 Signalling optimization on L2/L3 layer p. 45
6.3 Support of massive number of devices p. 45
6.3.1 Background and Scenarios p. 46
6.3.2 Access control in CELL_PCH and URA PCH without seamless transition to CELL_FACH p. 46
6.3.3 Access control in URA_PCH with seamless transition to CELL_FACH p. 46
6.4 Device power saving enhancements p. 47
6.4.1 Long DRX Cycle up to 40.96 seconds p. 47
6.4.1.1 Performance evaluation p. 47
6.4.1.2 Impact on legacy and new UEs p. 48
6.4.1.3 Possible solutions for long DRX up to 40.96s p. 49
6.4.2 Extended DRX cycle beyond 40.96 seconds p. 51
6.4.2.1 Event based p. 51
6.4.2.1.1 General p. 51
6.4.2.1.2 NAS signalling p. 52
6.4.2.1.3 DL data in Idle mode p. 53
6.4.2.1.4 DL data in PCH state p. 54
6.4.2.1.5 UL data p. 54
6.4.2.1.6 UE measurements p. 55
6.4.2.1.7 eDRX performance p. 55
6.4.2.2 Hyper SFN based p. 58
6.4.2.2.1 Hyper SFN and extended DRX p. 58
6.4.2.2.2 Configuration of eDRX cycle p. 58
6.4.2.2.3 Managing Paging resources for eDRX UEs p. 58
6.4.2.3 DRX combinations p. 59
6.4.2.3.1 Baseline DRX configuration p. 59
6.4.2.3.2 Options for long and extended DRX configuration p. 59
6.4.2.4 Impact of MIB reading on battery life time p. 61
6.4.3 Quick return into PSM mode p. 61
7 Impact on RAN WGs p. 61
7.1 Impact on RAN1 specifications p. 61
7.2 Impact on RAN2 specifications p. 62
7.3 Impact on RAN3 specifications p. 63
7.4 Impact on RAN4 specifications p. 63
8 Conclusions p. 63
8.1 TSG RAN WG1 p. 63
8.2 TSG RAN WG2 p. 65
A Power consumption model p. 67
$ Change History p. 68
