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TR 36.881 (RAN2)
Study on latency reduction techniques for LTE

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V14.0.0 (Wzip)    2016/06    99 p.

Rapporteur:  Mr. Enbuske, Henrik
See also:  –

This document is related to the technical report for the study item "Study on latency reduction techniques for LTE". The purpose of this TR is to capture the findings from TSG RAN WG2 and WG1 according to their respective objectives, and to draw a conclusion on way forward.

This activity involves the Radio Access work area of the 3GPP studies and has potential impacts both on the Mobile Equipment and Access Network of the 3GPP systems.

This document is a 'living' document, i.e. it is permanently updated and presented to TSG-RAN meetings.


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1   Scope   Word-p. 6
2   References
3   Definitions, symbols and abbreviations   Word-p. 7
4   Study Objectives
5   Overview of LTE latency
6   Scenarios, Applications and Use Cases
7   Evaluation Structure and Assumptions   Word-p. 15
8   Solutions for latency reduction
9   Performance Evaluation   Word-p. 20
9.1   Protocol evaluations on TTI reduction and Fast UL
9.1.1   Simulation 1: TCP slow-start behavior for FTP file download based on reduced TTI and reduced SR periodicity [4]   Word-p. 21      Up
9.1.2   Simulation 2: Capacity and throughput gain with 0.5ms TTI [5]   Word-p. 24
9.1.3   Simulation 3: Throughput and packet download time with reduced latency in LTE [3]   Word-p. 26
9.1.4   Simulation 4: Latency evaluation results for TTI reduction and Fast UL [6]   Word-p. 27
9.1.5   Simulation 5: System Performance with TTI shortening [6]   Word-p. 34
9.1.6   Simulation 6: Evaluation results for TTI reduction [6]   Word-p. 44
9.1.7   Simulation 7: Performance evaluation of latency reduction enhancements [6]   Word-p. 46
9.1.8   Simulation 8: TTI reduction gain with additional L1/L2 overhead [6]   Word-p. 52
9.1.9   Simulation 9: Effect of UE and eNB processing times on TCP performance [6]   Word-p. 54
9.1.10   Simulation 10: System Performance Gain with TTI reduction [6]   Word-p. 58
9.1.11   Simulation 11: TTI reduction gain with additional L2 overhead [9]   Word-p. 60
9.1.12   Simulation 12: TTI reduction gain with additional L2 overhead [10]   Word-p. 61
9.2   Protocol evaluations on Contention based PUSCH transmission   Word-p. 64
9.3   Handover latency [11]   Word-p. 74
9.4   Findings from system evaluations on TTI reduction and reduced processing time
9.5   Findings from link evaluations on TTI reduction and reduced processing time   Word-p. 76

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