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 Word‑p. 8
5 Scenarios and use cases
6 Study areas Word‑p. 9
6.1 Coverage enhancements
6.1.1 Reference scenario
6.1.2 Baseline evaluation results Word‑p. 10
6.1.2.1 Coverage evaluation results source I
6.1.2.2 Coverage evaluation results source II Word‑p. 11
6.1.3 Potential solutions Word‑p. 14
6.1.3.1 Larger TTI
6.1.3.2 TTI repetition
6.1.3.3 Power boosting Word‑p. 15
6.1.3.4 Increasing HARQ retransmissions
6.1.3.5 PRACH preamble coverage enhancements
6.1.3.5.1 Solutions of Repetitions with energy accumulation
6.1.3.5.2 Considerations on the PRACH preamble repetition schemes Word‑p. 19
6.1.3.5.3 Uplink optimization for small data transmission Word‑p. 20
6.1.3.5.3.1 PRACH optimization Word‑p. 21
6.1.3.6 PRACH message coverage enhancements Word‑p. 22
6.1.3.7 Enhanced uplink coverage enhancements Word‑p. 23
6.1.3.7.1 Analysis on the power cost for the EUL physical channels
6.1.3.7.2 Solution 1 to enhance the coverage of the EUL Word‑p. 24
6.1.3.7.3 Solution 2 to enhance the coverage of the EUL Word‑p. 25
6.1.3.7.4 Solution 3 to enhance the coverage of the EUL Word‑p. 26
6.1.3.7.5 Solution 4 to enhance the coverage of the EUL Word‑p. 27
6.1.3.7.6 Legacy aspects related to the coverage enhancements for EUL Word‑p. 28
6.1.3.7.7 HARQ process design for Solution 1 and Solution 2 Word‑p. 29
6.1.3.7.8 Summary of the solutions for EUL Word‑p. 30
6.1.3.8 PCH over S-CCPCH coverage enhancements Word‑p. 31
6.1.4 Considerations on selection of repetition number Word‑p. 37
6.1.5 Summary of the potential coverage enhancements Word‑p. 38
6.2 Signalling optimizations for small-data transmission Word‑p. 42
6.2.1 Signalling optimization on physical layer
6.2.1.1 Solutions of layer 1 signalling optimization
6.2.1.2 Evaluations on signalling optimization Word‑p. 43
6.2.2 Signalling optimization on L2/L3 layer Word‑p. 45
6.3 Support of massive number of devices
6.3.1 Background and Scenarios Word‑p. 46
6.3.2 Access control in CELL_PCH and URA PCH without seamless transition to CELL_FACH
6.3.3 Access control in URA_PCH with seamless transition to CELL_FACH
6.4 Device power saving enhancements Word‑p. 47
6.4.1 Long DRX Cycle up to 40.96 seconds
6.4.1.1 Performance evaluation
6.4.1.2 Impact on legacy and new UEs Word‑p. 48
6.4.1.3 Possible solutions for long DRX up to 40.96s Word‑p. 49
6.4.2 Extended DRX cycle beyond 40.96 seconds
6.4.2.1 Event based
6.4.2.1.1 General
6.4.2.1.2 NAS signalling Word‑p. 52
6.4.2.1.3 DL data in Idle mode Word‑p. 53
6.4.2.1.4 DL data in PCH state Word‑p. 54
6.4.2.1.5 UL data
6.4.2.1.6 UE measurements Word‑p. 55
6.4.2.1.7 eDRX performance
6.4.2.2 Hyper SFN based Word‑p. 58
6.4.2.2.1 Hyper SFN and extended DRX
6.4.2.2.2 Configuration of eDRX cycle
6.4.2.2.3 Managing Paging resources for eDRX UEs
6.4.2.3 DRX combinations Word‑p. 59
6.4.2.4 Impact of MIB reading on battery life time Word‑p. 61
6.4.3 Quick return into PSM mode
7 Impact on RAN WGs
7.1 Impact on RAN1 specifications
7.2 Impact on RAN2 specifications Word‑p. 62
7.3 Impact on RAN3 specifications Word‑p. 63
7.4 Impact on RAN4 specifications
8 Conclusions
8.1 TSG RAN WG1
8.2 TSG RAN WG2 Word‑p. 65
A Power consumption model Word‑p. 67
$ Change History Word‑p. 68
