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TR 38.874RAN2
NR — Study on Integrated Access and Backhaul

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V16.0.0 (Wzip)  2018/12  111 p.

WI Acronym:  FS_NR_IAB
Rapporteur:  Dr. Hampel, GeorgQualcomm Incorporated

This document describes the architectures, the radio protocols, and the physical layer aspects related to relaying of access traffic by sharing radio resources between access and backhaul links.

full Table of Contents for  TR 38.874  Word version:   16.0.0

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1  ScopeWord-p. 7
2  References
3  Definitions and abbreviations
4  IntroductionWord-p. 8
The objective of the study was to identify and evaluate potential solutions for efficient operation of integrated access and wireless backhaul for NR. Frequency ranges up to 100 GHz will be considered. Detailed objectives of the study item were:
  • Topology management for single-hop/multi-hop and redundant connectivity [RAN2, RAN3], e.g.:
    • Protocol stack and network architecture design (including interfaces between rTRPs) considering operation of multiple relay hops between the anchor node (e.g. connection to core) and UE;
    • Control and User plane procedures, including handling of QoS, for supporting forwarding of traffic across via one or multiple wireless backhaul links.
  • Route selection and optimization [RAN2, RAN1, RAN3], e.g.:
    • Mechanisms for discovery and management of backhaul links for TRPs with integrated backhaul and access functionalities;
    • RAN-based mechanisms to support dynamic route selection (potentially without core network involvement) to accommodate short-term blocking and transmission of latency-sensitive traffic across backhaul links;
    • Evaluate the benefit of resource allocation/route management coordination across multiple nodes, for end-to-end route selection and optimization.
  • Dynamic resource allocation between the backhaul and access links [RAN1, RAN2], e.g.:
    • Mechanisms to efficiently multiplex access and backhaul links (for both DL and UL directions) in time, frequency, or space under a per-link half-duplex constraint across one or multiple backhaul link hops for both TDD and FDD operation;
    • Cross-link interference (CLI) measurement, coordination and mitigation between rTRPs and UEs.
  • High spectral efficiency while also supporting reliable transmission [RAN1]:
    • Identification of physical layer solutions or enhancements to support wireless backhaul links with high spectral efficiency.
5  Requirements
6  Architectures
7  Physical layer aspects
8  Radio protocol aspectsWord-p. 26
8.1  Packet Processing
8.2  User-plane considerations for architecture group 1
8.3  Control-plane considerations for architecture group 1Word-p. 50
8.4  User-plane considerations for architecture group 2Word-p. 60
8.5  Control-plane considerations for architecture group 2Word-p. 61
8.6  Latency in UL scheduling
9  Backhaul aspectsWord-p. 64
9.1  Additional Interfaces
9.2  IAB Topologies
9.3  Integration of IAB-nodeWord-p. 67
9.4  Modifications to CU/DU architectureWord-p. 72
9.5  Backhaul bearer setup for architecture group 1
9.6  IAB Topology DiscoveryWord-p. 74
9.7  Topology adaptationWord-p. 76
9.8  LTE-access over NR backhaul
10  ComparisonWord-p. 99
11  ConclusionWord-p. 103
A  Evaluation methodologyWord-p. 104
B  Change historyWord-p. 111

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