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TR 25.896
Feasibility study for enhanced uplink for UTRA FDD

3GPP‑Page
V6.0.0 (Wzip)  2004/04  179 p.
Rapporteur:
Mr. Ranta-aho, Karri

full Table of Contents for  TR 25.896  Word version:  6.0.0

1Scope  p. 9
2References  p. 9
3Definitions, symbols and abbreviations  p. 10
4Introduction  p. 10
5Requirements  p. 10
6Reference Techniques in Earlier 3GPP Releases  p. 11
6.1DCH Setup Mechanisms  p. 11
6.1.1Uplink/Downlink Synchronization  p. 12
6.2Uplink TFCS Management with RRC Signalling  p. 12
6.3Transport Format Combination Selection in the UE  p. 13
6.3.1Description of TFC selection method  p. 13
6.3.2TFC selection method as a reference case for Enhanced Uplink DCH  p. 15
6.4RNC controlled scheduling: DRAC and TFCS Restriction  p. 16
7Overview of Techniques considered to support Enhanced Uplink  p. 17
7.1Scheduling <NodeB controlled scheduling, AMC>  p. 17
7.1.1Node B Controlled Rate Scheduling by Fast TFCS Restriction Control  p. 19
7.1.1.1Purpose and General Assumptions  p. 19
7.1.1.2General Principle  p. 19
7.1.1.3Restricting the Allowed Uplink TFCs in a TFCS by L1 Signalling  p. 19
7.1.1.4Issues Requiring Further Studying  p. 20
7.1.1.5Signalling to Support Fast TFCS Restriction Control  p. 21
7.1.1.5.1L1 signaling  p. 21
7.1.1.5.2RRC signalling  p. 21
7.1.1.5.3Iub/Iur signalling  p. 21
7.1.2Method for Node B Controlled Time and Rate Scheduling  p. 21
7.1.2.1Purpose and General Assumptions  p. 21
7.1.2.2General Principle  p. 21
7.1.2.3Controlling UE TFCS and transmission time  p. 22
7.1.2.4Issues Requiring Further Study  p. 23
7.1.2.5Signalling to Support Fast Node-B Time and Rate Control  p. 23
7.1.2.5.1L1 Signalling  p. 23
7.1.2.5.1.1Uplink Signalling of Scheduling Information Update  p. 24
7.1.2.5.1.1.1Explicit scheduling information update signaling  p. 24
7.1.2.5.1.1.2Other ways of conveying scheduling information update to Node B  p. 25
7.1.2.5.2RRC Signalling (TBD)  p. 25
7.1.2.5.3Iub/Iur Signalling (TBD)  p. 25
7.1.3Scheduling in Soft Handover  p. 25
7.1.4Node B Controlled Rate Scheduling by Persistence Control  p. 25
7.1.4.1Issues Requiring Further Studying  p. 26
7.1.4.2Signalling to Support Fast Rate Scheduling by Persistence Control  p. 26
7.1.4.2.1L1 signaling  p. 26
7.1.5Brief Overview of Different Scheduling Strategies  p. 26
7.1.5.1Node B Controlled Rate Scheduling by Fast TFCS Restriction Control  p. 26
7.1.5.2Node B Controlled Time and Rate Scheduling  p. 26
7.2Hybrid ARQ  p. 26
7.2.1General  p. 26
7.2.2Transport Channel Processing  p. 27
7.2.3Associated Signaling  p. 28
7.2.4Operation in Soft Handover  p. 28
7.3Fast DCH Setup Mechanisms  p. 29
7.3.1Background  p. 29
7.3.2Reducing Uplink/Downlink Synchronization Time  p. 29
7.4Shorter Frame Size for Improved QoS  p. 31
7.5Signalling to support the enhancements  p. 32
7.5.1Downlink signalling  p. 32
7.5.1.1Basic considerations  p. 32
7.5.1.2Downlink signalling multiplexed on existing channel  p. 32
7.5.1.3Downlink signalling on a new code channel  p. 32
7.5.2Uplink signalling  p. 33
7.5.2.1Basic considerations  p. 33
7.5.2.2Coding, multiplexing and mapping options  p. 33
7.5.2.2.1Mapping on (E-)DPDCH  p. 33
7.5.2.2.1.1Mapping on DPDCH using a TrCH  p. 34
7.5.2.2.2Mapping on DPCCH  p. 34
7.5.2.2.3Mapping on a new code channel  p. 34
7.6Miscellaneous enhancements  p. 35
7.6.1Support for enhanced channel estimation  p. 35
8Physical Layer Structure Alternatives for Enhanced Uplink DCH  p. 35
8.1Relationship to existing transport channels  p. 35
8.1.1Transport Channel Structure  p. 35
8.1.1.1Number of E-DCHs  p. 36
8.1.1.2TTI  p. 36
8.2TTI length vs. HARQ physical channel structure  p. 37
8.3Multiplexing alternatives in general  p. 38
8.3.1Reuse of current physical layer structure  p. 39
8.3.2Allocating a separate code channel for Enhanced uplink DCH  p. 39
8.4Multiplexing alternatives in detail  p. 39
8.4.1Physical layer structures in time domain (TS25.212 )  p. 40
8.4.1.1General structures describing only how to multiplex DCH and E-DCH  p. 40
8.4.1.1.1Physical Layer Structure Supporting minimum TTI of 10ms  p. 40
8.4.1.1.1.1Code multiplexing between DCH and E-DCH  p. 40
8.4.1.1.1.2Time multiplexing between DCH and E-DCH  p. 41
8.4.1.1.2Physical Layer Structure Supporting minimum TTI of 2ms  p. 42
8.4.1.1.2.1Code multiplexing between DCH and E-DCH  p. 42
8.4.1.1.2.2Time multiplexing between DCH and E-DCH  p. 43
8.4.1.2More detailed structures defining how to multiplex L1 signaling (HSDPCCH, DPCCH, EDPCCH) with DCH and E-DCH  p. 45
8.4.2Physical layer structures in code domain  p. 45
8.4.2.1Case 1: Structure when using code multiplexing for all channels  p. 46
8.4.2.2Case 2: Structure when E-DCH, DCH and EDPCCH are time Multiplexed  p. 47
8.4.2.3Case 3: Structure when E-DCH , DCH and EDPCCH and HS-DPCCH are time multiplexed  p. 48
8.4.2.4Case 4: Structure when E-DCH, EDPCCH and HSDPCCH are time multiplexed  p. 49
8.4.2.5Case 5: Structure similar to case 2, but with 8PSK included  p. 50
8.4.2.6Case 6: Structure similar to case 3, but with 8PSK included  p. 50
8.4.2.7Case 7: Structure similar to case 4, but with 8PSK included  p. 50
8.4.2.8Case 8: Structure when using code multiplexing for all channels  p. 51
8.5E-DCH timing  p. 52
9Evaluation of Techniques for Enhanced Uplink  p. 53
9.1Scheduling <NodeB controlled scheduling, AMC>  p. 53
9.1.1Performance Evaluation  p. 53
9.1.1.1Comparison of Centralized and Decentralized Scheduler  p. 53
9.1.1.1.1Results with Full Buffer  p. 53
9.1.1.1.2Results with Mixed Traffic Model  p. 55
9.1.1.1.3Discussion  p. 56
9.1.2Complexity Evaluation <UE and RNS impacts>  p. 57
9.1.3Downlink Signalling  p. 57
9.1.4Uplink Signalling  p. 57
9.1.58PSK link performance  p. 57
9.2Hybrid ARQ  p. 58
9.2.1Performance Evaluation  p. 58
9.2.1.1Hybrid ARQ performance with and without soft combining  p. 58
9.2.1.2Hybrid ARQ performance in soft handover  p. 62
9.2.1.3HARQ Efficiency  p. 64
9.2.2Complexity Evaluation <UE and RNS impacts>  p. 66
9.2.2.1Buffering complexity  p. 66
9.2.2.1.1Soft buffer at Node B  p. 66
9.2.2.1.2Reordering buffer in radio network  p. 66
9.2.2.1.3Retransmission buffer in UE  p. 67
9.2.2.2Encoding/decoding and rate matching complexity  p. 67
9.2.2.3UE and RNS processing time considerations  p. 67
9.2.2.4HARQ BLER operation point and complexity  p. 67
9.2.3Downlink Signalling  p. 67
9.2.4Uplink Signalling  p. 67
9.2.4.1E-TFC signalling  p. 67
9.2.4.1.1Summary of results  p. 69
9.2.4.1.1.1Case 1 results  p. 69
9.2.4.1.1.2Case 2 results  p. 70
9.2.4.1.1.3Case 3 results  p. 71
9.2.4.1.2Simulation assumptions  p. 72
9.3Fast DCH Setup Mechanisms  p. 72
9.3.1Performance Evaluation  p. 72
9.3.2Complexity Evaluation <UE and RNS impacts>  p. 72
9.3.3Downlink Signalling  p. 72
9.3.4Uplink Signalling  p. 72
9.4Shorter Frame Size for Improved QoS  p. 72
9.4.1Performance Evaluation  p. 72
9.4.1.1Data only, Full buffer  p. 72
9.4.1.2Data only, Traffic models  p. 75
9.4.1.3Voice & Data, Full buffer  p. 82
9.4.2Complexity Evaluation <UE and RNS impacts>  p. 85
9.4.3Downlink Signalling  p. 85
9.4.4Uplink Signalling  p. 86
9.5Physical layer structures  p. 86
9.5.1Complexity evaluation  p. 86
9.5.1.1PAR analysis  p. 86
9.5.1.1.1Total number of channel bits from both E-DCH and DCH that can be accommodated one BPSK code channel with SF=4  p. 88
9.5.1.1.2Total number of channel bits from both E-DCH and DCH that can be accommodated in two BPSK code channels with SF=4  p. 89
9.5.1.1.3Total number of channel bits from both E-DCH and DCH that can be accommodated in three BPSK code channels with SF=4  p. 90
9.5.1.1.4Total number of channel bits from both E-DCH and DCH that can be accommodated in four BPSK code channels with SF=4  p. 91
9.5.1.1.5Total number of channel bits from both E-DCH and DCH that can be accommodated in five BPSK code channels with SF=4  p. 93
9.5.1.1.6Total number of channel bits from both E-DCH and DCH that can be accommodated in six BPSK code channels with SF=4  p. 94
9.5.1.1.7Total number of channel bits from both E-DCH and DCH that can be accommodated in three 8PSK streams with SF=4  p. 95
9.5.1.2Considerations on PAR analysis  p. 95
9.5.1.2.1Example based on case 2/5 and parameter set 1  p. 95
9.5.1.2.2Example based on case 1,2 (BPSK vs 8-PSK)  p. 96
9.5.1.2.3Example for multi-code  p. 97
9.5.1.2.4Discussion  p. 98
9.6Results including multiple techniques  p. 98
9.6.1Results with HARQ, shorter TTI, time & rate scheduling  p. 98
9.6.1.1Full Buffer results  p. 98
9.6.1.2Mixed traffic model results  p. 105
9.6.2Results with HARQ, 10ms TTI, rate scheduling with persistence  p. 113
9.6.2.1Full Buffer results  p. 113
9.6.2.2Mixed traffic model results  p. 114
9.7Compatibility of the enhancements with existing releases  p. 120
9.7.1Compatibility at the edge of coverage  p. 120
9.7.1.1Non transparent functionality  p. 120
9.7.1.2Transparent functionality  p. 120
9.7.2Legacy UE  p. 121
9.7.3Link budget  p. 121
9.7.4DL capacity  p. 121
9.7.5Design re-use  p. 122
9.7.6Conclusion  p. 122
10Impacts to the Radio Interface Protocol Architecture  p. 122
10.0Protocol Model  p. 122
10.1Introduction of new MAC functionality  p. 122
10.1.1Introduction of an enhanced uplink dedicated transport channel (E-DCH)  p. 123
10.1.2HARQ functionality  p. 123
10.1.3Reordering entity  p. 123
10.1.4TFC selection  p. 123
10.2RLC  p. 123
10.3RRC  p. 123
11Impacts to Iub/Iur Protocols  p. 124
11.1Impacts on Iub/Iur Application Protocols  p. 124
11.2Impacts on Frame Protocol over Iub/Iur  p. 124
12Conclusions and Recommendations  p. 124
12.1Conclusions  p. 124
12.2Recommendations  p. 125
ASimulation Assumptions and Results  p. 126
A.1Link Simulation Assumptions  p. 126
A.1.1Interface between link level and system level  p. 126
A.1.2Link level parameters  p. 127
A.1.3Channel models  p. 127
A.1.4Description of Short Term FER and ECM Metod  p. 128
A.1.4.1Short-term FER method:  p. 128
A.1.4.2ECM method:  p. 128
A.1.4.3Comparison between short term and ECM method  p. 130
A.2Link Simulation Results  p. 132
A.2.1HARQ Performance Evaluation  p. 132
A.2.1.1HARQ Efficiency and Number of Retransmissions  p. 132
A.2.2Link Performance of E-DCH for System Simulations  p. 136
A.2.2.1Short-term Link Performance with 2 ms TTI  p. 136
A.2.2.2Short-term Link Performance with 10 ms TTI  p. 144
A.2.3Link Performance with Different Pilot Overhead  p. 149
A.2.3.1Assumptions  p. 149
A.2.3.2Results  p. 149
A.2.4Link Performance of Release-99 for System Simulations  p. 153
A.3System Simulation Assumptions  p. 153
A.3.1System Level Simulation Modelling and Parameters  p. 153
A.3.1.1Antenna Pattern  p. 153
A.3.1.2System Level Parameters  p. 154
A.3.1.3Signaling Errors  p. 156
A.3.1.4Downlink Modeling in Uplink System Simulation  p. 156
A.3.2Uplink measurement accuracy  p. 157
A.3.2.1Uplink power control  p. 157
A.3.3System Simulation Outputs and Performance Metrics  p. 158
A.3.3.1Output metrics for data services  p. 158
A.3.3.2Mixed Voice and Data Services  p. 159
A.3.3.3Voice Services and Related Output Metrics  p. 159
A.3.3.3.1Voice Model  p. 159
A.3.3.4Packet Scheduler  p. 159
A.4System Simulation Results  p. 160
A.4.1Release-99 Performance  p. 160
A.4.1.1Release-99 Performance With Full Buffer  p. 160
A.4.1.1.1System Setup  p. 160
A.4.1.1.2Performance Without TFC Control in AWGN  p. 160
A.4.1.1.3Performance With TFC Control in AWGN  p. 161
A.4.1.2Release-99 Performance With Mixed Traffic Model  p. 163
A.4.1.2.1System Setup  p. 163
A.4.1.2.2Performance Without TFC Control in AWGN  p. 164
A.4.1.3Release-99 Voice Capacity  p. 166
A.4.1.3.1System Setup  p. 166
A.4.1.3.2Voice Capacity  p. 167
A.5Traffic Models  p. 167
BLognormal description  p. 175
CUplink Rise Outage Filter  p. 175
DSpeech Source (Markov) Model  p. 175
EModeling of the effect of channel estimation errors on Link performance  p. 176
FChange history  p. 177

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