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TR 23.737  SA2 ★
Study on Architecture aspects
for using Satellite Access in 5G

3GPP‑Page   full‑ToC
use "3GPP‑Page" to get the Word version
for a better overview, the Table of Contents (ToC) is reproduced
V17.0.0 (Wzip)  2019/12  82 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:   17.0.0

Here   Top
1  Scope  Word-p. 7
2  References
3  Definitions, symbols and abbreviations
3.1  Definitions
3.2  Abbreviations  Word-p. 8
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. 9
4.1.3  Roaming and mobility between satellite only PLMN and terrestrial only PLMN  Word-p. 10
4.2  Satellite backhaul scenario  Up
4.3  Architectural assumptions
5  Key Issues  Word-p. 11
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. 12
5.3.1  General description
5.4  Key Issue #4: QoS with satellite access
5.4.1  General description  Up
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. 13
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. 14
5.8.1  General description
5.9  Key Issue #9: Multi connectivity with hybrid satellite/terrestrial backhaul  Word-p. 15
5.9.1  General Description  Up
5.10  Key Issue #10: Regulatory services with super-national satellite ground station  Word-p. 16
5.10.1  Description
6  Solutions  Word-p. 17
6.1  Solution #1: Position-based and fixed TA Satellite Access
6.1.1  Description
6.1.2  Procedures  Word-p. 20
6.1.3  Impacts on existing nodes and functionality
6.1.4  Solution evaluation
6.2  Solution #2: Addition of new values to RAT type IE
6.2.1  Description  Up
6.2.2  Procedures  Word-p. 21
6.2.3  Impacts on existing nodes and functionality  Word-p. 22
6.2.4  Solution evaluation  Word-p. 23
6.3  Solution #3: Backhaul triggered QoS adaptation
6.3.1  Description
6.3.2  Procedures  Word-p. 24
6.3.3  Impacts on existing nodes and functionality  Word-p. 27
6.3.4  Solution evaluation
6.4  Solution #4: Support of UP path switch between SAT RAN and TER RAN
6.4.1  Description  Up
6.4.2  Procedures  Word-p. 28
6.4.2.1  Activating a MA-PDU session for path switching
6.4.3  Impacts on existing nodes and functionality  Word-p. 29
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. 31
6.5.4  Solution evaluation
6.6  Solution #6: Role of satellite backhaul in content distribution towards the edge  Up
6.6.1  General description
6.6.2  Procedures  Word-p. 32
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. 33
6.6.4  Solution evaluation
6.7  Solution #7: Idle mode mobility procedure for non-geostationary satellite access
6.7.1  Description
6.7.2  Procedures  Word-p. 34
6.7.3  Impacts on existing nodes and functionality  Word-p. 36
6.7.4  Solution evaluation  Up
6.8  Solution #8: 5GS enhancement to support gNBs on NGSO satellites  Word-p. 37
6.8.1  Description
6.8.2  Procedures  Word-p. 38
6.8.3  Impacts on existing nodes and functionality  Word-p. 39
6.8.4  Solution evaluation
6.9  Solution #9: Distributed gNB for NGSO satellites
6.9.1  Description
6.9.2  Procedures  Word-p. 41
6.9.3  Impacts on existing nodes and functionality
6.9.4  Solution evaluation  Up
6.10  Solution #10: Addressing delay in satellite
6.10.1  Description
6.10.1.1  Sources of delay  Word-p. 42
6.10.1.2  Delay adaptation in the Core Network
6.10.1.3  Impact on timers
6.10.1.4  Timers management  Word-p. 43
6.10.1.5  Overall proposal
6.10.2  Procedures  Word-p. 44
6.10.3  Impacts on existing nodes and functionality
6.10.4  Solution evaluation  Up
6.11  Solution #11: Backhaul QoS handling based on AMF and UPF information
6.11.1  Description
6.11.2  Procedures  Word-p. 47
6.11.2.1  Procedures of detecting backhaul related information
6.11.2.2  Procedures of detecting backhaul related information via N2 interface
6.11.2.3  Procedures of utilizing backhaul related information during the PDU session establishment procedure
6.11.2.4  Procedures of utilizing backhaul information during the PDU session modification procedure  Word-p. 49
6.11.3  Impacts on existing nodes and functionality  Word-p. 51
6.11.4  Solution evaluation
6.12  Solution #12: Satellite cells for 5G satellite access  Word-p. 52
6.12.1  Description
6.12.1.1  Virtual Cells approach  Word-p. 54
6.12.1.2  Geographical Zones approach  Word-p. 57
6.12.2  Procedures  Word-p. 59
6.12.2.1  Mobility Procedures
6.12.2.2  Emergency Calls  Word-p. 60
6.12.2.3  Lawful interception by the UE's visited country
6.12.2.4  Public Warning System  Word-p. 61
6.12.2.5  Charging / Customer Notifications
6.12.3  Impacts on existing nodes and functionality  Up
6.12.4  Solution evaluation  Word-p. 62
6.13  Solution #13: Country specific PLMN selection  Word-p. 64
6.13.1  Description
6.13.2  Procedures  Word-p. 65
6.13.2.1  UE switch on and recovery from lack of coverage situation
6.13.2.2  UE performing PLMN selection
6.13.2.3  UE registered in VPLMN
6.13.2.4  AMF processing of Registration Request from UE accessing over satellite  Word-p. 66
6.13.2.5  UE mobility in connected mode
6.13.3  Impacts on existing nodes and functionality  Up
6.13.4  Solution evaluation
6.14  Solution #14: Mobility and QoS with Satellite Access  Word-p. 67
6.14.1  Description
6.14.2  Procedures  Word-p. 68
6.14.3  Impacts on existing nodes and functionality
6.14.4  Solution evaluation
7  Overall evaluation
7.1  Evaluation of solutions for Key Issue #1 - Mobility management with large satellite coverage areas
7.2  Evaluation of solutions for Key Issue #2 - Mobility Management with moving satellite coverage areas
7.3  Evaluation of solutions for Key Issue #3 - Delay in satellite  Word-p. 69
7.4  Evaluation of solutions for Key Issue #4 - QoS with satellite access
7.5  Evaluation of solutions for Key Issue #5 - QoS with satellite backhaul  Word-p. 70
7.6  Evaluation of solutions for Key Issue #6 - RAN mobility with NGSO regenerative-based satellite access  Word-p. 71
7.7  Evaluation of solutions for Key Issue #7 - Multi connectivity with satellite access
7.8  Evaluation of solutions for Key Issue #8 - The role of satellite link in content distribution towards the edge  Word-p. 72
7.9  Evaluation of solutions for Key Issue #9 - Multi connectivity with hybrid satellite/terrestrial backhaul
7.10  Evaluation of solutions for Key Issue #10 - Regulatory services with super-national satellite ground station
8  Conclusions  Word-p. 73
8.1  Conclusion on solutions for Key Issue #1
8.2  Conclusion on solutions for Key Issue #2  Up
8.3  Conclusion on solutions for Key Issue #3
8.4  Conclusion on solutions for Key Issue #4
8.5  Conclusion on solutions for Key Issue #5
8.6  Conclusion on solutions for Key Issue #6
8.7  Conclusion on solutions for Key Issue #7  Word-p. 74
8.8  Conclusion on solutions for Key Issue #8
8.9  Conclusion on solutions for Key Issue #9
8.10  Conclusion on solutions for Key Issue #10
A  Characteristics of satellite systems  Word-p. 75
A.1  General  Up
A.2  Class of orbit
A.3  Geometrical coverage of satellite and propagation delay  Word-p. 76
A.4  Type of satellite communication payloads  Word-p. 77
A.5  Handovers  Word-p. 78
A.6  Air interfaces
A.7  General considerations on the use of satellite networks
B  Architecture Models for Satellite Integration in 5GS  Word-p. 79
B.1  Elementary satellite network architecture
B.2  Reference architecture with satellite enabled NR-RAN
C  Change history  Word-p. 82

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