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Content for  TR 22.839  Word version:  18.1.0

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6  Other considerationsWord‑p. 53

This clause includes other aspects of mobile vehicle relays deployments and potential service requirements, not specifically covered by the use cases and requirements described in the clause 5, particularly related to:
  • The possibility for a relay to have a HPLMN subscription, and roam into other networks, together with the need to have proper control from both home and visited PLMNs;
  • The need to potentially support regulatory requirements, including emergency services;
  • The ability to support priority services, such as MPS;
  • The expected support of end-to-end security;
  • The ability to avoid or overcome challenges related to radio interference.
Corresponding new potential service requirements are captured below.
[PR 6-1a]
The 5G System shall support means for a mobile base station relay to have a subscription with a HPLMN, used to get access and connectivity to the HPLMN 5GC (via a donor RAN).
[PR 6-1b]
The 5G System shall support the ability of a base station relay to roam from its HPLMN into a VPLMN.
[PR 6-1c]
The 5G system shall support mechanisms, for the HPLMN controlling a mobile base station relay, to enable/disable mobile relay operation if/when the relay (e.g. on a mobile vehicle) is roaming in a VPLMN.
[PR 6-1d]
The 5G system shall support mechanisms to disable mobile relay operation by VPLMN where a mobile base station relay is roaming to.
[PR 6-2]
The 5G system shall be able to fulfil necessary regulatory requirements (e.g. for support of emergency services) when UEs access the 3GPP network via a mobile base station relay.
[PR 6-3]
The 5G system shall be able to support priority services (e.g. MPS) when UEs access the 3GPP network via a mobile base station relay.
[PR 6-4]
The 5G system shall ensure that end-to-end 5G security between the UE and 3GPP network is supported when the UE accesses the 3GPP network via a mobile base station relay.
[PR 6-5]
The 5G system shall be able to minimize radio interference possibly caused by mobile base station relays (e.g. when mounted on moving vehicles).
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7  Potential Consolidated RequirementsWord‑p. 53

7.0  IntroductionWord‑p. 53

The requirements below refer to a "mobile base station relay" (or mobile BS relay), which is a mobile base station acting as a relay between a UE and the 5G network, i.e. providing a NR access link to UEs and connected wirelessly (using NR) through a donor NG-RAN to the 5G Core. Such mobile BS relay is assumed to be mounted on a moving vehicle and serve UEs that can be located inside or outside the vehicle (or entering/leaving the vehicle).
Few main underlying assumptions and notes (from the TR overview and gap analysis) are:
  • use cases and requirements cover single-hop relay scenarios as baseline (multi-hop is not precluded);
  • legacy UEs are supported;
  • current stage-1 requirements (e.g. on wireless self-backhaul, in TS 22.261), as well as existing stage-2/3 functionalities and architecture options (e.g. IAB) do not assume or address full relay mobility (e.g. BS relays on board of moving vehicles), thus may not cover the identified new potential requirements, which are intended to be specific to mobile BS relays;
  • The identified requirements do not intend to imply or exclude specific network/relay architectures and topology solutions (e.g. could be IAB based, or others).
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7.1  General requirementsWord‑p. 55

CPR # Consolidated Potential Requirement Original PR # Comment
CPR 7.1-1The 5G system shall support efficient operation of mobile base station relays.PR 5.1-1, 5.3-1, 5.6-1, 5.8-1
CPR 7.1-2The 5G system shall be able to support means, for a mobile network operator, to configure, provision and control the operation of a mobile base station relay, e.g. activation/deactivation, permitted location(s) or time of operation.PR 5.1-2, 5.2-2, 5.2-3
CPR 7.1-3The 5G system shall be able to support provisioning and configuration mechanisms to control UEs' selection and access to a mobile base station relay, e.g. based on UE's authorization, geographic or temporary restrictions, relay's loadPR 5.2-1, 5.4-1, 5.3-2, 5.5-1
CPR 7.1-4The 5G System shall be able to support mobile base station relays using 3GPP satellite NG-RAN.PR 5.16.6-1
CPR 7.1-5The 5G system shall be able to support RAN sharing between multiple PLMNs for UEs connected to the 5G network via mobile base station relays. PR 5.17-1
CPR 7.1-6The 5G system shall be able to configure and provision specific required QoS for traffic relayed via a mobile base station relay. PR 5.10-1
CPR 7.1-7Subject to regulatory requirements and based on operator policy, the 5G system shall support means to configure and expose monitoring information of a mobile base station relay to an MNO's authorized third-party.PR 5.18-1
CPR 7.1-8The 5G system shall be able to support incremental deployment of connectivity by means of one or a series of mobile base station relays for use only in specific locations where UEs would receive no other 3GPP access (terrestrial or non-terrestrial) coverage, e.g., for public safety scenarios.PR 5.15.6-1
CPR 7.1-9The 5G system shall be able to provide means to optimize network behaviour to efficiently deliver data based on the mobility information (e.g., itinerary), known or predicted, of mobile base station relays.PR 5.21-1
CPR 7.1-10The 5G system shall be able to support communication from/to users of one MNO (MNO-A) via mobile base station relays, where the traffic between the relay and the MNO-A network is transported using 5G connectivity (RAN and 5GC) provided by a different MNO (MNO-B). PR 5.20-1
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7.2  Multi-link connectivityWord‑p. 56

CPR # Consolidated Potential Requirement Original PR # Comment
CPR 7.2-1The 5G system shall be able to support UEs connectivity to RAN using simultaneously, a link without mobile BS relay and a link via a mobile BS relay, or simultaneous links via different mobile BS relays. PR 5.13.6-2, 5.19-1
CPR 7.2-2The 5G system shall be able to support mobile base station relays accessing to 5GC via NR satellite access and NR terrestrial access simultaneously.PR 5.22.6-1, 5.23.6-1/2/3/4/5
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7.3  MobilityWord‑p. 56

CPR # Consolidated Potential Requirement Original PR # Comment
CPR 7.3-1The 5G system shall be able to provide means to support efficient UE cell selection and cell reselection (between mobile BS relays or between relays and RAN) in the presence of mobile base station relays.PR 5.7-1, 5.12.6-1, 5.13.6-1
CPR 7.3-2The 5G system shall be able to support mechanisms to optimize mobility and energy efficiency for UEs located in a vehicle equipped with a base station relay. PR 5.14.6-1
CPR 7.3-3The 5G system shall be able to ensure end-to-end service continuity, in the presence of mobile base station relays PR 5.7-2, 5.6-2, 5.11.1-1/2, 5.11.2-1/2, 5.11.3-1/2, 5.11.4-1, 5.13.6-1, 5.17-2, 5.19-2
CPR 7.3-4The 5G System shall be able to support service continuity for mobile base station relays using at least one 3GPP satellite NG-RAN. PR 5.16.6-2, 5.22.6-2
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7.4  ChargingWord‑p. 56

CPR # Consolidated Potential Requirement Original PR # Comment
CPR 7.4-1The 5G system shall be able to identify and differentiate UEs' traffic carried via a mobile base station relay and collect charging information, including specific relay information (e.g. geographic location served by the relay).PR 5.10-2, 5.10-3, 5.10-4
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7.5  Other aspectsWord‑p. 57

CPR # Consolidated Potential Requirement Original PR # Comment
CPR 7.5-1The 5G System shall support means for a mobile base station relay to have a certain subscription with a HPLMN, used to get access and connectivity to the HPLMN network (via a donor RAN).PR 6-1a
CPR 7.5-2The 5G System shall support the ability of a base station relay to roam from its HPLMN into a VPLMN.PR 6-1b
CPR 7.5-3The 5G system shall support mechanisms, for the HPLMN controlling a mobile base station relay, to enable/disable mobile relay operation if the relay is roaming in a VPLMN.PR 6-1c
CPR 7.5-4The 5G system shall support mechanisms to disable mobile relay operation by a VPLMN where a mobile base station relay is roaming toPR 6-1d
CPR 7.5-5The 5G system shall be able to fulfil necessary regulatory requirements (e.g. for support of emergency services) when UEs access the 3GPP network via a mobile base station relay.PR 6-2
CPR 7.5-6The 5G system shall be able to support priority services (e.g. MPS) when UEs access the 3GPP network via a mobile base station relay.PR 6-3
CPR 7.5-7The 5G system shall be able to support location services for the UEs accessing 5GS via a mobile base station relay.PR 5.9-1, 5.9-2
CPR 7.5-8The 5G system shall ensure that existing end-to-end 5G security between the UE and 3GPP network is unaffected when the UE accesses the 3GPP network via a mobile base station relay.PR 6-4
CPR 7.5-9The 5G system shall be able to minimize radio interference possibly caused by mobile base station relays.PR 6-5
CPR 7.5-10The 5G system shall minimize the impact of the presence of mobile base station relays on radio network management (e.g. through automatic neighbour cell list configuration).N.AAdded during consolidation
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8  Conclusions and RecommendationsWord‑p. 57

This technical report identifies several use cases and potential new requirements for 5GS support of mobile base station relays. The resulting service requirements have been consolidated in clause 7.
It is recommended to consider the consolidated requirements identified in this TR as the baseline for subsequent normative work.

$  Change historyWord‑p. 58


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