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TR 38.821RAN3
Solutions for NR to support Non-Terrestrial Networks

use "3GPP‑Page" to get the Word version
for a better overview, the Table of Contents (ToC) is reproduced
V16.0.0 (Wzip)2019/12  140 p.

WI Acronym:  FS_NR_NTN_solutions
Rapporteur:  Mr. Chuberre, NicolasTHALES

3GPP 38.821 - Non-terrestrial network typical scenario
The objectives for this document are, based on the outcomes of the TR 38.811, to study a set of necessary features/adaptations enabling the operation of the New Radio (NR) protocol in non-terrestrial networks for 3GPP Release 16 with a priority on satellite access. Access network based on Unmanned Aerial System (UAS) including High Altitude Platform Station (HAPS) could be considered as a special case of non-terrestrial access with lower delay/Doppler value and variation rate.

short Table of Contents for  TR 38.821  Word version:   16.0.0

each title links to the equivalent title in the full ToC
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1  ScopeWord-p. 9
2  ReferencesWord-p. 9
3  Definitions of terms, symbols and abbreviationsWord-p. 12
4  Non-Terrestrial Networks overview and scenariosWord-p. 15
4.1  Non-Terrestrial Networks overviewWord-p. 15
4.2  Non-Terrestrial Networks reference scenariosWord-p. 16
5  NTN-based NG-RAN ArchitecturesWord-p. 19
5.1  Transparent satellite based NG-RAN architectureUpWord-p. 19
5.2  Regenerative satellite based NG-RAN architecturesWord-p. 22
5.3  Multi connectivity involving NTN-based NG-RANWord-p. 28
5.4  Service continuity between NTN and Terrestrial NetworksWord-p. 31
6  Radio Layer 1 issues and related solutionsWord-p. 34
6.1  Link-Level and System-Level EvaluationsWord-p. 34
6.2  Physical layer control proceduresWord-p. 58
6.3  Uplink timing advance/RACH procedureWord-p. 64
6.4  More delay-tolerant re-transmission mechanismsWord-p. 66
7  Radio protocol issues and related solutionsWord-p. 69
7.1  Requirements and key issuesWord-p. 69
7.2  User plane enhancementsWord-p. 70
7.3  Control plane enhancementsWord-p. 89
7.4  Earth fixed cells vs Earth moving cellsWord-p. 105
8  Issues and related solutions for NG-RAN architecture and interface protocolsWord-p. 106
8.1  Tracking area managementWord-p. 106
8.2  Registration Update and Paging HandlingWord-p. 107
8.3  Connected mode mobilityWord-p. 113
8.4  Transport aspectsWord-p. 117
8.5  Network Identities HandlingWord-p. 120
8.6  User LocationWord-p. 121
8.7  Feeder link switch overWord-p. 122
8.8  Operations & Maintenance (O&M)Word-p. 130
9  Recommendations on the way forwardWord-p. 130
A  Satellite ephemerisWord-p. 134
B  KPI and evaluation assumptionsWord-p. 136
C  Regulatory AspectsWord-p. 138
D  Change historyWord-p. 140

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