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Content for  TR 23.700-05  Word version:  18.0.0

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1 Scope  2 References  3 Definitions of terms and abbreviations  4 Architecture assumptions and requirements 
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1  Scope  p. 9

The scope of this Technical Report is to study and identify potential architecture and system level enhancements for the 5G system to support the operation of base station relays mounted on vehicles, using NR for wireless access toward the UE and for wireless access through an IAB-donor toward the 5GC, i.e. in this release only IAB type relays based on the IAB architecture and functionalities specified in TS 23.501 are studied. The study addresses the service requirements documented in TS 22.261 for the mobile base station relays, and focuses on the following aspects:
  • efficient mobility and service continuity for UE or a group of UEs to efficiently deliver data during different mobility scenarios (including mobility of the mobile base station relays);
  • provisioning, policies and mechanisms to e.g. manage relay configuration, geographic restrictions, QoS, authorization and control of UEs' access via the mobile base station relay, etc.;
  • support for roaming of mobile base station relay (including the roaming of the IAB-UE and gNB-DU in IAB-node), support for regulatory requirements (e.g. emergency, priority services, public safety), and support for location services for UEs accessing a mobile base station relay.
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2  References  p. 9

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]
TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
TS 23.501: "System architecture for the 5G System (5GS); Stage 2".
[3]
TS 22.261: "Service requirements for the 5G system; Stage 1".
[4]
TS 23.273: "5G System (5GS) Location Services (LCS); Stage 2".
[5]
TS 23.502: "Procedures for the 5G System (5GS); Stage 2".
[6]
TS 38.401: "NG-RAN; Architecture description".
[7]
TS 23.503: "Policy and Charging Control Framework for the 5G System".
[8]
TS 24.588: "Vehicle-to-Everything (V2X) services in 5G System (5GS); User Equipment (UE) policies; Stage 3".
[9]
TS 23.304: "Proximity based Services (ProSe) in the 5G System (5GS)".
[10]
TS 24.501: "Non-Access-Stratum (NAS) protocol for 5G System (5GS); Stage 3".
[11]
TS 23.287: "Architecture enhancements for 5G System (5GS) to support Vehicle-to-Everything (V2X) services".
[12]
TS 23.122: "Non-Access-Stratum functions related to Mobile Station (MS) in idle mode".
[13]
TS 37.355: "LTE Positioning Protocol (LPP)".
[14]
TS 38.455: "NR Positioning Protocol A (NRPPa)".
[15]
TR 23.700-86: "Study on Architecture Enhancement to support Ranging based services and sidelink positioning".
[16]
TS 38.331: "NR; Radio Resource Control (RRC); Protocol specification".
[17]
TS 38.305: "Stage 2 functional specification of User Equipment (UE) positioning in NG-RAN".
[18]
TS 38.473: "F1 application protocol (F1AP)".
[19]
TS 38.413: "NG Application Protocol (NGAP)".
[20]
TS 38.300: "NR; Overall description; Stage-2".
[21]
TS 38.304: "NR; User Equipment (UE) procedures in idle mode ".
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3  Definitions of terms and abbreviations  p. 10

3.1  Terms  p. 10

For the purposes of the present document, the terms given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.
mobile base station relay:
A mobile base station acts 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 IAB-donor to the 5G Core. Such mobile base station 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).
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3.2  Abbreviations  p. 10

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
MBSR
Mobile Base Station Relay
TRP
Transmission-Reception Point
VMR
Vehicle Mounted Relay

4  Architecture assumptions and requirements  p. 10

4.1  Architecture assumptions  p. 10

The study should be based on the following architecture assumptions:
  • the mobile base station relays uses the IAB architecture as defined in clause 5.35 of TS 23.501;
  • the mobile base station relay has a single hop to the IAB-donor node;
  • the mobile base station relay may serve UEs located inside or outside the vehicle mounted with the relay;
  • NR Uu is used for the radio link between a mobile base station relay and served UEs, and between mobile base station relay and IAB-donor node. However, optimization solutions can also consider combining other functionalities, e.g. using PC5 for discovery and mobility assistance/control amongst relays;
  • LCS framework as defined in TS 23.273 is used for providing the location service to the served UEs;
  • the mobile base station may connect to an IAB-donor node of a PLMN or an SNPN.
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4.2  Architecture requirements  p. 11

Solutions of the study should provide architecture and system level enhancements to the 5G system to support the operation of base station relays to satisfy the normative requirements in TS 22.261. Specifically, the enhanced system needs to:
  • support legacy UE(s) to connect via base station relays, but can consider optimizations involving UE changes;
  • support end-to-end service continuity, in the presence of mobile base station relays, including when the mobile base station relays change the IAB-donor nodes;
  • support the mobile network operator to configure, provision and control the operation of a mobile base station relay;
  • support of regulatory requirements (e.g. for support of emergency services, priority services) when UEs access 5GS via a mobile base station relay;
  • support roaming of the mobile base station relay from its HPLMN into a VPLMN.
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