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TR 23.737 (SA2) ☆ (Rel-16 draft)
Study on Architecture aspects
for using Satellite Access in 5G

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for a better overview, the Table of Contents (ToC) is reproduced

V0.8.0 (Wzip) 2019/05 39 p.

Rapporteur: Mr. Rognant, Pierre

The scope of this Technical Report is to study:

The identification of impact areas of satellite integration in the 5GS, when considering TR 22.822 use cases.
The identification of solutions to adjust the 5G system for the impact impacts areas for the reference use cases:
- Roaming between terrestrial and satellite networks.
- 5G Fixed Backhaul between Satellite Enabled NR-RAN and the 5G Core.
The resolution of RAN and CN inter-related issues.

full Table of Contents for TR 23.737 Word version: 0.8.0

1 Scope Word-p. 6

3 Definitions, symbols and abbreviations

3.1 Definitions

3.3 Abbreviations Word-p. 7

4 Reference Satellite Integration Scenarios and Architectural Assumptions

4.1 Satellite access class scenarios

4.1.1 Satellite and terrestrial access networks within a PLMN

4.1.2 PLMNs with shared satellite access Word-p. 8

4.1.3 Roaming and mobility between satellite only PLMN and terrestrial only PLMN

4.2 Satellite backhaul scenario Word-p. 9

4.3 Architectural assumptions

5 Key Issues Word-p. 10

5.1 Key Issue #1: Mobility management with large satellite coverage areas

5.1.1 General description

5.2 Key Issue #2: Mobility Management with moving satellite coverage areas

5.2.1 General description

5.3 Key Issue #3: Delay in satellite Word-p. 11

5.3.1 General description

5.4 Key Issue #4: QoS with satellite access

5.4.1 General description

5.5 Key Issue #5: QoS with satellite backhaul

5.5.1 General description

5.6 Key Issue #6: RAN mobility with NGSO regenerative-based satellite access Word-p. 12

5.6.1 General description

5.7 Key Issue #7: Multi connectivity with satellite access

5.7.1 General description

5.8 Key Issue #8: The role of satellite link in content distribution towards the edge Word-p. 13

5.8.1 General description

5.9 Key Issue #9: Multi connectivity with hybrid satellite/terrestrial backhaul

5.9.1 General Description

6 Solutions Word-p. 14

6.1 Solution #1: Position-based and fixed TA Satellite Access

6.1.1 Description

6.1.2 Procedures Word-p. 15

6.1.3 Impacts on existing nodes and functionality Word-p. 16

6.1.4 Solution Evaluation

6.2 Solution #2: Addition of new RAT type satellite

6.2.1 Description

6.2.2 Procedures

6.2.3 Impacts on existing nodes and functionality Word-p. 17

6.2.4 Solution evaluation Word-p. 18

6.3 Solution #3: Backhaul triggered QoS adaptation

6.3.1 Description

6.3.2 Procedures

6.3.3 Impacts on existing nodes and functionality Word-p. 22

6.3.4 Solution Evaluation

6.4 Solution #4 for Key Issue #7: Support of UP path switch between SAT RAN and TER RAN

6.4.1 Description

6.4.2 Procedures Word-p. 23

6.4.2.1 Activating a MA-PDU session for path switching

6.4.3 Impacts on existing nodes and functionality Word-p. 24

6.4.4 Solution Evaluation

6.5 Solution #5: QoS control for satellite backhaul scenario

6.5.1 Description

6.5.2 Procedures

6.5.3 Impacts on existing nodes and functionality Word-p. 26

6.5.4 Solution Evaluation

6.6 Solution #6 for Key Issue #8: Role of satellite backhaul in content distribution towards the edge

6.6.1 General description

6.6.2 Procedures Word-p. 27

6.6.2.1 Procedures to serve UE from the edge with a requested content

6.6.3 Impacts on existing nodes and functionality Word-p. 28

6.6.4 Solution evaluation

6.7 Solution #7 for Key Issue #2: Idle mode mobility procedure for non-geostationary satellite access

6.7.1 Description

6.7.2 Procedures

6.7.3 Impacts on existing nodes and functionality Word-p. 30

6.7.4 Solution Evaluation

7 Overall Evaluation

8 Conclusions Word-p. 31

A Characteristics of satellite systems Word-p. 32

A.2 Class of orbit

A.3 Geometrical coverage of satellite and propagation delay Word-p. 33

A.4 Type of satellite communication payloads Word-p. 34

A.5 Handovers Word-p. 35

A.6 Air interfaces

A.7 General considerations on the use of satellite networks

B Architecture Models for Satellite Integration in 5GS Word-p. 36

B.1 Elementary satellite network architecture

B.2 Reference architecture with satellite enabled NR-RAN

C Change history Word-p. 39