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TR 38.804
Study on New Radio Access Technology –
Radio Interface Protocol Aspects

3GPP‑Page
V14.0.0 (Wzip)  2017/03  57 p.
Rapporteur:
Mr. Takahashi, Hideaki
DOCOMO Communications Lab.

full Table of Contents for  TR 38.804  Word version:  14.0.0

0Introduction  p. 6
1Scope  p. 7
2References  p. 7
3Definitions and abbreviations  p. 8
3.1Definitions  p. 8
3.2Abbreviations  p. 8
4Deployment scenarios and guidelines  p. 8
4.1Deployment scenarios  p. 9
4.1.1Cell layout  p. 9
4.1.2CN-RAN connection  p. 9
4.1.2.1NR gNB as a master node  p. 9
4.1.2.2LTE eNB as a master node  p. 10
4.1.2.3eNB connected to NextGen Core as a master node  p. 10
4.1.2.4Inter-RAT mobility  p. 11
4.1.3WLAN integration  p. 11
4.2Guidelines  p. 12
5Overall system architecture  p. 13
5.1Functional split  p. 14
5.2Radio interface protocol architecture  p. 15
5.2.1User plane  p. 16
5.2.1.1User plane protocol stack for NR  p. 16
5.2.1.2Bearer types for Dual Connectivity between LTE and NR  p. 16
5.2.2Control plane  p. 17
5.2.2.1Control plane protocol stack for NR  p. 17
5.2.2.2Control plane architecture for Dual Connectivity between LTE and NR  p. 18
5.2.2.2.1UE capability coordination between LTE and NR  p. 19
5.3Physical Layer  p. 20
5.3.1General description  p. 20
5.3.2Key DL concepts  p. 20
5.3.3Key UL concepts  p. 20
5.3.4Beam management  p. 20
5.3.5Channel structure  p. 21
5.3.5.1Physical channels  p. 21
5.3.5.2Transport channels  p. 21
5.3.5.3Mapping between transport channels and physical channels  p. 22
5.4Layer 2  p. 22
5.4.1Overview of Layer 2 functions  p. 22
5.4.2MAC Sublayer  p. 24
5.4.3RLC Sublayer  p. 24
5.4.4PDCP Sublayer  p. 24
5.4.5New AS Sublayer  p. 25
5.4.6Overview of Layer 2 data flow  p. 25
5.4.7Numerologies and TTI durations  p. 26
5.5RRC  p. 26
5.5.1Functions  p. 26
5.5.2UE states and state transitions  p. 27
5.5.2.1RAN-based notification area management  p. 28
5.5.3System information handling  p. 29
5.5.3.1Dual Connectivity between LTE and NR  p. 30
5.5.4Measurements  p. 30
5.5.4.1Dual Connectivity between LTE and NR  p. 30
5.5.5Access control  p. 30
5.5.6UE capability retrieval framework  p. 31
6ARQ and HARQ  p. 31
6.1ARQ  p. 31
6.2HARQ  p. 31
7Scheduling  p. 31
8QoS control  p. 32
8.1QoS architecture in NR and NextGen Core  p. 32
8.2Dual Connectivity between LTE and NR via EPC  p. 33
9Initial access  p. 33
9.1Cell selection  p. 33
9.2Random Access Procedure  p. 34
10Mobility  p. 35
10.1Intra NR  p. 35
10.1.1UE based mobility  p. 35
10.1.1.1Cell reselection  p. 35
10.1.1.2Paging  p. 35
10.1.2Network controlled mobility  p. 36
10.2Inter RAT  p. 37
10.3Dual Connectivity between LTE and NR  p. 39
11Security  p. 39
12UE power saving  p. 40
13RAN support of Network Slicing  p. 40
14E-UTRA with NextGen Core  p. 40
15Specification methodology  p. 41
15.1Overview of Technical Specifications for NR  p. 41
15.2RRC specification methodology  p. 41
AAgreements  p. 42
A.1General aspects  p. 42
A.2User plane aspects  p. 42
A.3RRC  p. 43
A.4Intra-NR mobility and measurements  p. 43
BSummary of Layer 2 functional changes from LTE  p. 44
B.1Rationale behind out-of-order delivery of complete PDCP PDUs after RLC SDU reassembly  p. 44
B.2Rationale behind concatenation in MAC and MAC sub-header interleaving  p. 45
CBackground and evaluation results on on-demand SI provisioning  p. 45
C.1Background  p. 45
C.2Analysis of technology potential  p. 45
C.3Additional evaluation results  p. 50
DComparison results on bearer types for LTE-NR Dual Connectivity  p. 51
EStudy results on two-step Random Access procedure  p. 53
E.1Two-step Random Access procedure  p. 53
E.2Random Access Minimum Latency  p. 54
FNetwork control mobility  p. 55
GSmall UL data transmission in RRC_INACTIVE  p. 55
$Change history  p. 57

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