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TR 25.705 (RAN6)
Study on Small data transmission enhancements for UMTS

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V13.0.0 (Wzip)    2015/07    68 p.

Rapporteur:  Dr. Medina, Gerardo
See also:  –

Small data applications are expected to be a large growth area, with the potential for billions of connected devices. In many cases, this type of traffic poses different service requirements compared to conventional traffic types. For an important segment of applications, the requirements on power consumption and coverage versus data rate and latency may vary.

The phenomenal success of WCDMA technologies means that up to the 2020 timescale and beyond, WCDMA will be a dominant 3GPP technology with a large coverage footprint. Furthermore, WCDMA devices are already available at a cost level that is suitable for the machine oriented communication market. In order to serve the market opportunities, many operators likely need to provide enhanced support for small data applications with a coverage footprint that WCDMA can provide.

The current generation of WCDMA specifications has been optimized for mobile broadband traffic. To ensure that small data applications are properly addressed, the specifications should enable requirements on coverage in challenging device locations, low device power consumption and machine type data rates to be met.

This Technical Report (TR) contains the investigations performed by the TSG RAN Working Groups involved in the study of small data transmission enhancements for UMTS.


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1   Scope   Word-p. 6
2   References
3   Definitions, symbols and abbreviations   Word-p. 7
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      Up
6.1.2   Baseline evaluation results   Word-p. 10
6.1.3   Potential solutions   Word-p. 14   Larger TTI   TTI repetition   Power boosting   Word-p. 15   Increasing HARQ retransmissions   PRACH preamble coverage enhancements      Up   PRACH message coverage enhancements   Word-p. 22   Enhanced uplink coverage enhancements   Word-p. 23   PCH over S-CCPCH coverage enhancements   Word-p. 31
6.1.4   Considerations on selection of repetition number   Word-p. 37      Up
6.1.5   Summary of the potential coverage enhancements   Word-p. 38
6.2   Signalling optimizations for small-data transmission   Word-p. 42
6.3   Support of massive number of devices      Up
6.4   Device power saving enhancements   Word-p. 47
7   Impact on RAN WGs
8   Conclusions
A   Power consumption model   Word-p. 67      Up
B   Change history   Word-p. 68

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