Content for TR 25.912 Word version: 18.0.0
3 Definitions, symbols and abbreviations
4 Introduction
5 Deployment scenario
6 Radio interface protocol architecture for evolved UTRA
7 Physical layer for evolved UTRA
8 Layer 2 and RRC evolution for evolved UTRA
9 Architecture for evolved UTRAN
10 RF related aspects of evolved UTRA
11 Radio resource management aspects of evolved UTRA
12 System and terminal complexity
13 Performance assessments
14 Conclusions and Recommendations
$ Change History
3 Definitions, symbols and abbreviations p. 7
4 Introduction p. 9
5 Deployment scenario p. 10
6 Radio interface protocol architecture for evolved UTRA p. 10
6.1 User plane p. 12
6.2 Control plane p. 12
7 Physical layer for evolved UTRA p. 13
7.1 Downlink transmission scheme p. 13
7.1.1 Basic transmission scheme based on OFDMA p. 13
7.1.1.1 Basic parameters p. 13
7.1.1.2 Multiplexing including reference-signal structure p. 14
7.1.1.2.1 Downlink data multiplexing p. 14
7.1.1.2.2 Downlink reference-signal structure p. 14
7.1.1.2.3 Downlink L1/L2 Control Signaling p. 14
7.1.1.3 MIMO and transmit diversity p. 15
7.1.1.4 MBMS p. 15
7.1.2 Physical layer procedure p. 15
7.1.2.1 Scheduling p. 15
7.1.2.2 Link adaptation p. 16
7.1.2.3 HARQ p. 16
7.1.2.4 Cell search p. 16
7.1.2.5 Inter-cell interference mitigation p. 17
7.1.3 Physical layer measurements p. 17
7.2 Uplink transmission scheme p. 18
7.2.1 Basic transmission scheme p. 18
7.2.1.1 Modulation scheme p. 19
7.2.1.2 Multiplexing including reference signal structure p. 19
7.2.1.2.1 Uplink data multiplexing p. 19
7.2.1.2.2 Uplink reference-signal structure p. 20
7.2.1.2.3 Multiplexing of L1/L2 control signaling p. 20
7.2.1.2.4 Uplink L1/L2 Control Signalling p. 20
7.2.1.3 MIMO p. 21
7.2.1.4 Power De-rating Reduction p. 21
7.2.2 Physical channel procedure p. 21
7.2.2.1 Random access procedure p. 21
7.2.2.2 Scheduling p. 21
7.2.2.3 Link adaptation p. 22
7.2.2.4 Power control p. 22
7.2.2.5 HARQ p. 22
7.2.2.6 Uplink timing control p. 22
7.2.2.7 Inter-cell interference mitigation p. 22
8 Layer 2 and RRC evolution for evolved UTRA p. 23
8.1 MAC sublayer p. 24
8.1.1 Services and functions p. 24
8.1.2 Logical channels p. 24
8.1.2.1 Control channels p. 25
8.1.2.2 Traffic channels p. 25
8.1.3 Mapping between logical channels and transport channels p. 25
8.1.3.1 Mapping in Uplink p. 26
8.1.3.2 Mapping in downlink p. 26
8.2 RLC sublayer p. 26
8.3 PDCP sublayer p. 27
8.4 RRC p. 27
9 Architecture for evolved UTRAN p. 29
9.1 Evolved UTRAN architecture p. 29
9.2 Functional split p. 29
9.3 Interfaces p. 30
9.3.1 S1 interface p. 30
9.3.1.1 Definition p. 30
9.3.1.2 S1-C RNL protocol functions p. 30
9.3.1.3 S1-U RNL protocol functions p. 30
9.3.1.4 S1-X2 similarities p. 30
9.3.2 X2 interface p. 30
9.4 Intra-LTE-access-system mobility p. 31
9.4.1 Intra-LTE-access-system mobility support for UE in LTE_IDLE p. 31
9.4.2 Intra LTE-Access-System Mobility Support for UE in LTE_ACTIVE p. 31
9.5 Inter 3GPP access system mobility p. 33
9.5.1 Inter 3GPP access system mobility in Idle state p. 33
9.5.2 Inter 3GPP access system mobility handover p. 33
9.6 Resource establishment and QoS signalling p. 33
9.6.1 QoS concept and bearer service architecture p. 33
9.6.2 Resource establishment and QoS signalling p. 33
9.7 Paging and C-plane establishment p. 35
9.8 Evaluations on for E-UTRAN architecture and migration p. 35
9.9 Support of roaming restrictions in LTE_ACTIVE p. 35
10 RF related aspects of evolved UTRA p. 36
10.1 Scalable bandwidth p. 36
10.2 Spectrum deployment p. 36
11 Radio resource management aspects of evolved UTRA p. 37
11.1 Introduction p. 37
11.2 Definition and description of RRM functions p. 37
11.2.1 Radio Bearer Control (RBC) p. 37
11.2.2 Radio Admission Control (RAC) p. 37
11.2.3 Connection Mobility Control (CMC) p. 37
11.2.4 Packet Scheduling (PSC) p. 38
11.2.5 Inter-cell Interference Coordination (ICIC) p. 38
11.2.6 Load Balancing (LB) p. 38
11.2.7 Inter-RAT Radio Resource Management p. 38
11.3 RRM architecture in LTE p. 38
11.4 Support of load sharing and policy management across different Radio Access Technologies (RATs) p. 39
12 System and terminal complexity p. 39
13 Performance assessments p. 41
13.1 Peak data rate p. 41
13.2 C-plane latency p. 42
13.2.1 FDD frame structure p. 43
13.2.2 TDD frame structure type 1 p. 44
13.2.3 TDD frame structure type 2 p. 46
13.3 U-plane latency p. 46
13.3.1 FDD frame structure p. 47
13.3.2 TDD frame structure type 1 p. 48
13.3.3 TDD frame structure type 2 p. 49
13.4 User throughput p. 50
13.4.1 Fulfilment of uplink user-throughput targets p. 50
13.4.1.1 Initial performance evaluation p. 50
13.4.1.2 UL user throughput performance evaluation p. 50
13.4.2 Fulfilment of downlink user-throughput targets p. 51
13.5 Spectrum efficiency p. 53
13.5.1 Fulfilment of uplink spectrum-efficiency target p. 53
13.5.1.1 Initial performance evaluation p. 53
13.5.1.2 UL spectrum efficiency performance evaluation p. 53
13.5.2 Fulfilment of downlink spectrum-efficiency target p. 54
13.6 Mobility p. 55
13.6.1 Features supporting various mobile velocities p. 55
13.6.2 Assessment on U-plane interruption time during handover p. 56
13.6.3 Means to minimise packet loss during handover p. 58
13.7 Coverage p. 58
13.8 Support for point to multipoint transmission p. 59
13.9 Network synchronisation p. 60
13.10 Co-existence and inter-working with 3GPP RAT p. 61
13.11 General requirements p. 61
13.12 VoIP performance evaluation p. 62
14 Conclusions and Recommendations p. 62
14.1 Conclusions p. 62
14.2 Recommendations p. 63
$ Change History p. 64
