Content for TR 25.706 Word version: 13.0.0
1 Scope
2 References
3 Definitions, symbols and abbreviations
3.1 Definitions
3.2 Symbols
3.3 Abbreviations
4 Objectives of the Downlink enhancements for UMTS Study
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1 Scope p. 6
WCDMA currently serves as the dominant mobile broadband technique. The number of connections for WCDMA users and the average user date rate have continued to increase in the past years and will further increase in the coming years, which requires WCDMA to evolve further from both uplink and downlink perspective.
2 References p. 6
The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
- References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific.
- For a specific reference, subsequent revisions do not apply.
- For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]
TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
3GPP RP-141657: "Study on Downlink Enhancements for UMTS".
[3]
TS 25.331: "Radio Resource Control (RRC)".
[4]
3GPP Tdoc R1-145138, "Evaluation results on downlink aspects of the solutions", Huawei, HiSilicon.
[5]
3GPP Tdoc R1-145039, "DL evaluation of TPC enhancements", Qualcomm Incorporated.
[6]
3GPP Tdoc R1-150542, "DL evaluation of TPC enhancements", Qualcomm Incorporated.
[7]
3GPP Tdoc R1-150614, "Text Proposal on uplink evaluations for downlink enhancement solutions", Huawei, HiSilicon.
[8]
3GPP Tdoc R1-150340, "Uplink impacts of a slower TPC update frequency", Ericsson.
[9]
3GPP Tdoc R1-150543, "UL impact from TPC enhancements", Qualcomm Incorporated.
[10]
TR 25.705: "Study on Small data transmission enhancements for UMTS".
3 Definitions, symbols and abbreviations p. 6
3.1 Definitions p. 6
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 Symbols p. 6
For the purposes of the present document, the following symbols apply:
3.3 Abbreviations p. 7
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.
AMC
Adaptive Modulation and Coding
CDF
Cumulative Distribution Function
CFN
Connection Frame Number
DMCR
Deferred Measurement Control Reading
E-DCH
Enhanced Dedicated Channel
E-DPDCH
E-DCH Dedicated Physical Data Channel
F-DPCH
Fractional Dedicated Physical Channel
HS-DPCCH
High Speed Dedicated Physical Control Channel
HS-DSCH
High Speed Downlink Shared Channel
IHR
Improved HARQ Retransmission
LHR
Legacy HARQ Retransmission
MCI
MAC Control Information
SCRI
Signalling Connection Release Indication
SHO
Soft Handover
4 Objectives of the Downlink enhancements for UMTS Study p. 7
The objectives of this study are ([2]):
- Investigate mechanisms to enhance DL control channel performance, for example: (RAN1)
- Repeat DL TPC commands in a number of consecutive slots to allow soft combining at the UE in order to reduce DL TPC transmit power.
- Investigate mechanisms to enhance downlink signaling performance on overhead and latency, especially for the case of RRC state transition and parameter updating. (RAN2)
- Investigate mechanisms to enhance SRB coverage over HSPA.(RAN2)
