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Content for  TR 25.702  Word version:  12.1.0

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1  ScopeWord‑p. 8

The present document captures design options, evaluation results and analysis from the study item on "DCH enhancements for UMTS" described in [2].
The work under this study intends to capture the merits and feasibility of DCH Enhancements in terms of the reduction in the average required power per user on the downlink and the average RoT consumed on the uplink. An evaluation of the increase in UE data throughput in a mixed voice-data traffic scenario when DCH enhancements were applied is also conducted.
The following enhancements are considered in the study:
  • DL Physical Layer Enhancements
    • DL DPCCH Slot Format Optimization
    • DL DPDCH Frame Early Termination
    • DL ACK Indicator design for UL FET
    • DPCH Time Domain Multiplexing
    • Reduced power control rate schemes
    • Node B DTX/UE DRX Mechanisms
  • UL Physical Layer Enhancements
    • UL DPCCH Slot Format Optimization
    • UL Frame Early Termination
    • UL ACK Indication for DL Frame Early Termination
    • DTCH/DCCH time compression
    • Reduced power control rate schemes
    • UE DTX/Node B DRX mechanisms
Additionally, the following aspects are also investigated:
  • UE Power Consumption Efficiency
  • Impact on Network implementation
  • Impact on UE implementation
  • Impact on specifications

2  References

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
TR 21.905: "Vocabulary for 3GPP Specifications".
RP-122029: "Proposed study item on DCH enhancements for UMTS".
"Enhanced HSDPA Mobility Performance: Quality and Robustness for VoIP Service", Qualcomm Inc. (
TS 25.212: "Multiplexing and channel coding (FDD)".
R1-123809: "Introducing Enhancements to CS voice over DCH", Qualcomm Inc.
R1-130513: "Scenarios for DCH enhancement", Huawei, HiSilicon.
R1-131606: "Robustness of SRBs on HSPA, Nokia Siemens Networks.
TS 34.108: "Common test environments for User Equipment (UE); Conformance testing".
TS 25.101: "User Equipment (UE) radio transmission and reception (FDD)".
TR 25.903: "Continuous connectivity for packet data users".
TS 25.214: "Physical layer procedures (FDD)".
TS 25.308: "High Speed Downlink Packet Access (HSDPA); Overall description; Stage 2".
R2-123282: "Signaling radio bearers with Multiflow HSDPA", Nokia Siemens Networks.
TS 25.321: "Medium Access Control (MAC) protocol specification".
TS 25.211: "Physical channels and mapping of transport channels onto physical channels (FDD)".

3  Definitions and abbreviationsWord‑p. 9

3.1  Definitions

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply.
A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.

3.2  Abbreviations

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply.
An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
Best Effort
Block Erasure Rate
Dedicated Channel
Early Termination
Early Termination Indicator
Frame Early Termination
Shared Dedicated Channel
Transmit Power Control Command Error Rate

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