Content for TR 38.912 Word version: 18.0.0
2 References
3 Definitions, symbols and abbreviations
4 Introduction
5 Deployment scenario
6 Forward compatibility
7 Radio interface protocol architecture for next generation radio
8 Physical layer for next generation radio
9 Layer 2 and RRC for next generation radio
10 Architecture for next generation RAN
11 QoS
12 Support for Network Slicing
13 Key higher layer and network procedures
14 Radio transmission/reception
15 Conclusions
A SI description for Study on New Radio (NR) Access Technology
$ Change History
2 References p. 7
3 Definitions, symbols and abbreviations p. 8
4 Introduction p. 9
5 Deployment scenario p. 9
6 Forward compatibility p. 11
7 Radio interface protocol architecture for next generation radio p. 11
7.1 User plane p. 11
7.1.1 User plane protocol stack for NR p. 11
7.1.2 Bearer types for Dual Connectivity between LTE and NR p. 11
7.2 Control plane p. 13
8 Physical layer for next generation radio p. 15
8.1 Numerologies and frame structure p. 15
8.2 Downlink transmission scheme p. 17
8.2.1 Basic transmission scheme p. 17
8.2.1.1 Modulation scheme p. 17
8.2.1.2 Physical layer channel p. 17
8.2.1.2.1 Physical resource multiplexing p. 17
8.2.1.2.2 Data channel p. 17
8.2.1.2.3 Control channel p. 18
8.2.1.3 Waveform p. 18
8.2.1.4 Multiple access scheme p. 19
8.2.1.5 Channel coding p. 19
8.2.1.5.1 LDPC p. 19
8.2.1.5.2 Polar coding p. 20
8.2.1.6 Multi-antenna scheme p. 20
8.2.2 Physical layer procedure p. 29
8.3 Uplink transmission scheme p. 31
8.3.1 Basic transmission scheme p. 31
8.3.1.1 Modulation scheme p. 31
8.3.1.2 Physical layer channel p. 32
8.3.1.2.1 Data channel p. 32
8.3.1.2.2 Control channel p. 32
8.3.1.3 Waveform p. 33
8.3.1.4 Multiple access scheme p. 33
8.3.1.5 Channel coding p. 33
8.3.1.5.1 LDPC p. 34
8.3.1.5.2 Polar coding p. 34
8.3.1.6 Multi-antenna scheme p. 34
8.3.2 Physical channel procedure p. 36
8.3.2.1 Random access procedure p. 36
8.3.2.1.1 Preamble p. 36
8.3.2.1.2 Procedure p. 37
8.3.2.2 Scheduling p. 37
8.3.2.3 Power control p. 38
8.3.2.4 HARQ p. 38
8.4 Duplexing p. 38
8.5 LTE-NR Co-existence p. 38
8.6 Carrier Aggregation / Dual Connectivity p. 39
9 Layer 2 and RRC for next generation radio p. 39
9.1 Overview of Layer 2 functions p. 39
9.2 MAC Sublayer p. 41
9.3 RLC Sublayer p. 41
9.4 PDCP Sublayer p. 41
9.5 New AS sublayer p. 42
9.6 Overview of Layer 2 data flow p. 42
9.7 Numerologies and TTI durations p. 42
9.8 RRC p. 43
9.8.1 Functions p. 43
9.8.2 UE states and state transitions p. 43
9.8.3 System information handling p. 45
9.8.4 Measurements p. 46
9.8.5 Access control p. 47
9.8.6 UE capability retrieval framework p. 47
10 Architecture for next generation RAN p. 47
10.1 RAN-CN functional split p. 47
10.2 Overall architecture p. 48
10.3 Interfaces p. 49
10.3.1 RAN-CN interface p. 49
10.3.1.1 General principles p. 49
10.3.1.2 NG Interface Functions p. 49
10.3.1.3 NG Interface Architecture p. 50
10.3.1.4 NG Control Plane p. 50
10.3.1.5 NG User Plane p. 50
10.3.2 RAN internal interface p. 51
10.3.2.1 Xn Interface p. 51
11 QoS p. 53
11.1 QoS architecture in NR and NextGen Core p. 53
11.2 Dual Connectivity between LTE and NR via EPC p. 55
12 Support for Network Slicing p. 55
13 Key higher layer and network procedures p. 55
13.1 Initial access p. 55
13.1.1 Cell selection p. 55
13.1.2 Random access procedure p. 56
13.2 Mobility p. 56
13.2.1 Intra-RAT p. 56
13.2.1.1 UE based mobility p. 56
13.2.1.1.1 Cell reselection p. 56
13.2.1.1.2 Paging p. 57
13.2.1.2 Network controlled mobility p. 57
13.2.2 Inter-RAT p. 58
13.2.3 Mobility related to Dual Connectivity between LTE and NR p. 60
13.3 Dual Connectivity between NR and LTE p. 61
13.3.1 General p. 61
13.3.2 Option 3/3a/3x p. 61
13.3.2.1 General principles for Xx interface p. 61
13.3.2.2 Architectural aspects p. 61
13.3.2.3 Procedural aspects p. 62
13.3.3 Option 4/4a p. 62
13.3.4 Option 7/7a/7x p. 63
13.4 PDU Session Management p. 64
14 Radio transmission/reception p. 66
14.1 Potential spectrum p. 66
14.2 Co-existence consideration p. 67
14.3 UE/BS RF feasibility p. 67
14.3.1 Common requirements for UE and BS p. 67
14.3.1.1 Subcarrier spacing p. 68
14.3.1.2 Maximum channel bandwidth p. 68
14.3.1.3 Flexible channel bandwidth p. 68
14.3.1.4 UE transmission bandwidth configuration adaptation p. 68
14.3.1.5 Spectrum Utilization p. 69
14.3.2 UE RF requirements p. 69
14.3.2.1 Wide frequency range of up to 52.6 GHz handling p. 69
14.3.2.2 Stand-Alone and Non-Stand-Alone perspective p. 69
14.3.2.3 Multiple numerologies within one carrier p. 70
14.3.3 BS RF requirements p. 70
15 Conclusions p. 71
A SI description for Study on New Radio (NR) Access Technology p. 72
$ Change History p. 74
