TR 25.814
Physical layer aspect for
evolved Universal Terrestrial Radio Access (UTRA)
V7.1.0 (Wzip)
2006/10 132 p.
- Rapporteur:
- Dr. Abeta, Sadayuki
full Table of Contents for TR 25.814 Word version: 7.1.0
1 Scope p. 9
This document is related to the technical report for physical layer aspect of the study item "Evolved UTRA and UTRAN" [1]. The purpose of this TR is to help TSG RAN WG1 to define and describe the potential physical layer evolution under consideration and compare the benefits of each evolution techniques, along with the complexity evaluation of each technique.
This activity involves the Radio Access work area of the 3GPP studies and has impacts both on the Mobile Equipment and Access Network of the 3GPP systems.
This document is intended to gather all information in order to compare the solutions and gains vs. complexity, and draw a conclusion on way forward.
Six basic L1 concept proposals are evaluated in this TR:
- FDD UL based on SC-FDMA, FDD DL based on OFDMA
- FDD UL based on OFDMA, FDD DL based on OFDMA
- FDD UL/DL based on MC-WCDMA
- TDD UL/DL based on MC-TD-SCDMA
- TDD UL/DL based on OFDMA
- TDD UL based on SC-FDMA, TDD DL based on OFDMA
1.1 Rationale for RAN#30 decision on way forward for Evolved UTRA multiple access p. 9
The following has been considered by TSG-RAN #30 (Dec'05):
- When compared to the reference defined in TR 25.913, and based on the initial system-level evaluations with 5 MHz allocation, the spectral efficiency improvements achievable with a (CDMA-based) system according to an "evolutionary" approach and the spectral efficiency improvements achievable with a new approach (e.g. OFDM-based) are both attractive.
- Using a CDMA based approach enables smoother migration from prior UTRA releases and might offer more extensive physical layer reuse.
- On the other hand, a new Layer 1, with an inherent avoidance of a priori constraints in the air-interface design, allows for a more free choice of design parameters, making it easier to fulfil some of the E-UTRA targets e.g. latency requirements, finer minimum bandwidth granularity, commonality between different duplex modes.
- UE receiver processing is somewhat simpler for an OFDMA-based air interface; the attractiveness in terms of complexity increases with larger bandwidths and/or high order MIMO configurations.
2 References p. 10
3 Definitions, symbols and abbreviations p. 11
4 Introduction p. 12
5 Requirements p. 13
6 General description of layer 1 p. 13
6.1 Multiband operation p. 13
6.2 Duplexing p. 13
7 Downlink concepts p. 20
7.1 OFDMA (FDD / [TDD]) p. 20
7.1.1 Basic transmission scheme p. 20
7.1.1.1 Modulation scheme p. 22
7.1.1.2 Multiplexing including reference-signal structure p. 26
7.1.1.2.1 Downlink data multiplexing p. 26
7.1.1.2.2 Downlink reference-signal structure p. 27
7.1.1.2.3 Downlink L1/L2 Control Signaling p. 28
7.1.1.3 Channel coding and physical channel mapping p. 30
7.1.1.4 MIMO and Transmit Diversity p. 30
7.1.1.4.1 Transmit Diversity for Control Channel p. 30
7.1.1.4.2 Aspects for LTE MIMO p. 31
7.1.1.4.3 High level principles of MIMO for unicast traffic p. 31
7.1.1.4.4 High level principles of MIMO for E-MBMS p. 32
7.1.1.5 Downlink macro diversity p. 33
7.1.1.6 MBMS p. 33
7.1.2 Physical layer procedure p. 35
7.1.2.1 Scheduling p. 35
7.1.2.2 Link adaptation p. 35
7.1.2.3 HARQ p. 36
7.1.2.4 Cell search p. 37
7.1.2.4.1 Purposes of the SCH, BCH, and reference symbols and information to be detected in the cell search p. 37
7.1.2.4.2 Structure in time p. 38
7.1.2.4.3 Structure in frequency p. 40
7.1.2.4.4 Transmit diversity for SCH and BCH transmission p. 42
7.1.2.4.5 SCH signal structure p. 42
7.1.2.4.6 Cell search procedure p. 43
7.1.2.5 Power control p. 45
7.1.2.6 Inter-cell interference mitigation p. 45
7.1.2.6.1 Inter-cell-interference randomization p. 45
7.1.2.6.2 Inter-cell-interference cancellation p. 46
7.1.2.6.3 Inter-cell-interference co-ordination/avoidance p. 46
7.1.2.7 Inter-Node B Synchronization p. 47
7.1.3 Physical layer measurements p. 47
7.2 MC-WCDMA (FDD) p. 49
7.2.1 High level principles p. 49
7.2.2 Basic Transmission Scheme p. 50
7.2.2.1 Definitions p. 50
7.2.2.2 WCDMA LCR system numerology p. 50
7.2.2.3 Assumptions for MC-WCDMA operation in DL p. 51
7.2.2.4 DL Single-carrier PHY Channels p. 52
7.2.2.5 DL Multi-Carrier PHY Channels p. 53
7.2.3 Physical Layer Procedures p. 54
7.2.3.1 DL PHY channels timing considerations p. 54
7.2.3.2 Synchronization Procedures: Cell Search p. 55
7.2.3.3 Synchronization Procedures: Synchronization of Dedicated channels p. 55
7.2.3.3.1 Procedure A p. 55
7.2.3.3.2 Procedure B p. 56
7.2.3.4 Power Control: DL PC p. 56
7.2.3.5 HS-DSCH Related Procedures p. 56
7.2.4 Physical layer measurements p. 56
7.3 MC-TD-SCDMA (TDD) p. 57
7.3.1 Basic transmission scheme p. 57
7.3.1.1 Modulation scheme p. 59
7.3.1.2 Multiplexing including pilot structure p. 59
7.3.1.3 Channel Coding and physical channel mapping p. 59
7.3.1.4 MIMO and beam-forming p. 59
7.3.2 Physical layer procedure p. 59
7.3.2.1 Scheduling p. 59
7.3.2.2 Link adaptation p. 59
7.3.2.3 HARQ p. 59
7.3.2.4 Cell search p. 59
7.3.2.5 Power control p. 59
7.3.3 Physical layer measurements p. 60
8 Evaluation of techniques for evolved UTRA DL p. 60
8.1 Performance evaluation p. 60
8.1.1 Traffic outage and latency requirements p. 60
8.1.2 Evaluation against reference p. 61
8.1.2.1 Evaluation for MC-WCDMA based evolved UTRA DL p. 61
8.1.2.2 Evaluation for OFDMA based evolved UTRA DL p. 61
8.1.3 Evaluation of OFDM based Multicast for evolved UTRA p. 69
8.2 Analysis of UE complexity p. 70
8.3 Analysis of Node B impacts p. 70
9 UL Concepts p. 71
9.1 SC-FDMA (FDD / [TDD]) p. 71
9.1.1 Basic transmission scheme p. 71
9.1.1.1 Modulation scheme p. 74
9.1.1.2 Multiplexing including reference signal structure p. 74
9.1.1.2.1 Uplink data multiplexing p. 74
9.1.1.2.2 Uplink reference-signal structure p. 75
9.1.1.2.3 Multiplexing of L1/L2 control signaling p. 77
9.1.1.2.4 Uplink L1/L2 Control Signaling p. 79
9.1.1.3 Channel coding and physical channel mapping p. 81
9.1.1.4 MIMO and Transmit Diversity p. 81
9.1.1.5 Uplink macro diversity p. 81
9.1.1.6 Power De-rating Reduction p. 81
9.1.2 Physical channel procedure p. 82
9.1.2.1 Random access procedure p. 82
9.1.2.2 Scheduling p. 87
9.1.2.3 Link adaptation p. 88
9.1.2.4 Power control p. 90
9.1.2.5 HARQ p. 90
9.1.2.6 Uplink timing control p. 91
9.1.2.7 Inter-cell interference mitigation p. 91
9.1.3 Physical layer measurements p. 93
9.2 OFDMA (FDD / [TDD]) p. 93
9.3 MC-WCDMA (FDD) p. 98
9.3.1 High level principles p. 98
9.3.2 Basic Transmission Scheme p. 99
9.3.2.1 Definitions p. 99
9.3.2.2 Assumptions for MC-WCDMA operation in UL p. 99
9.3.2.3 UL Single-carrier PHY Channels p. 100
9.3.2.4 UL Multi-Carrier PHY Channels p. 100
9.3.3 Physical Layer Procedures p. 102
9.3.3.1 PHY channels timing considerations p. 102
9.3.3.2 Power Control: UL PC p. 102
9.3.3.3 Random Access Procedure p. 102
9.3.3.4 E-DCH Related Procedures p. 103
9.3.4 Physical layer measurements p. 103
9.3.4.1 Node B measurements p. 103
9.4 MC-TD-SCDMA (TDD) p. 103
9.4.1 Basic transmission scheme p. 103
9.4.1.1 Modulation scheme p. 103
9.4.1.2 Multiplexing including pilot structure p. 103
9.4.1.3 Channel Coding and physical channel mapping p. 103
9.4.1.4 MIMO and beamforming p. 104
9.4.2 Physical channel procedure p. 104
9.4.2.1 Random access procedure p. 104
9.4.2.2 Scheduling p. 104
9.4.2.3 Link adaptation p. 104
9.4.2.4 Power control p. 104
9.4.2.5 HARQ p. 104
9.4.2.6 Uplink timing control p. 104
10 Evaluation of techniques for evolved UTRA UL p. 104
10.1 Performance evaluation p. 104
10.1.1 Evaluation against reference p. 104
10.1.1.1 MC-WCDMA based evolved UTRA UL p. 105
10.1.1.2 OFDMA based evolved UTRA UL p. 105
10.1.1.3 Evaluation of SC-FDMA based evolved UTRA UL p. 105
10.1.1.3.1 Peak rate evaluation p. 105
10.1.1.3.2 Throughput evaluation p. 107
10.1.1.3.3 UL VoIP evaluation p. 109
10.1.2 Evaluation between evolved UTRA UL proposals p. 111
10.2 Analysis of UE complexity p. 113
10.3 Analysis of Node B impacts p. 113
11 Evaluation common for UL/DL p. 113
12 UE capabilities p. 114
12.1 UE bandwidth capabilities p. 114
12.2 UE antenna capabilities p. 115
A Simulation scenarios p. 116
A.1 Link simulation Scenarios p. 116
A.1.1 Link simulation assumptions p. 116
A.1.2 Maximum SNR per channel p. 116
A.1.3 Multi-Antenna Link level channel models p. 117
A.2 System simulation scenario p. 120
A.2.1 System simulation assumptions p. 120
A.2.1.1 Reference system deployments p. 120
A.2.1.2 Channel models p. 123
A.2.1.2.1 Multi-path channel models & early simulations p. 123
A.2.1.2.2 Spatial channel model (SCM) p. 123
A.2.1.3 Traffic models p. 123
A.2.1.3.1 Latency analysis p. 124
A.2.1.4 System performance metrics p. 124
A.2.1.5 Reference Release 6 (UTRA) UE p. 124
A.2.1.6 Reference EUTRA UE p. 124
A.2.1.7 Reference Release 6 (UTRA) Node-B p. 125
A.2.1.8 Reference EUTRA Node-B p. 125
A.2.1.9 Scheduling & resource allocation p. 126
A.2.2 Multi-antenna subsystems p. 126
A.2.2.1 MIMO p. 126
A.2.2.2 SDMA/Beamforming p. 127
A.2.3 System configuration and performance topics p. 127
A.2.3.1 Frequency re-use assessment p. 127
A.2.3.2 Frame signaling reliability [TBD] p. 127
A.2.3.3 Macro diversity performance p. 127
A.2.3.4 Timing synchronization p. 127
A.2.3.5 RACH channel performance [TBD] p. 127
A.2.4 Examples of Cell and User throughput evaluation p. 127
A.3 E-UTRA physical layer framework for evaluation p. 129
A.3.1 Downlink p. 129
A.3.2 Uplink p. 130
$ Change history p. 132
