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TR 23.743  SA2 ★
Study on Optimisations
on UE Radio Capability Signalling

3GPP‑Page   full‑ToC
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V16.0.0 (Wzip)  2019/03  56 p.
Rapporteur:  Mr. Zisimopoulos, Haris
With the increase of the size of UE radio capabilities driven by additional bands supported by RAN specifications and UE support of significantly more band combinations, the size of the UE Radio Capabilities has and will significantly grow from Rel-15 onwards, an efficient approach to signal UE Radio Capability information is therefore needed.
This study item shall address two issues:
  • Optimizations of system procedures pertaining to the transfer UE Radio Capabilities related information to RAN.
  • Optimizations of system procedures related to transfer UE Radio Capabilities impacting the Core Network.
The overall goal is to study mechanisms to reduce the signalling over Uu, CN-RAN, CN-CN and RAN-RAN interfaces as well as the processing load in core and RAN (taking into account how frequently those message transfers and corresponding processing occurs) working in collaboration with RAN WGs for the related RAN interfaces and CT WG4 for the CN interfaces and NFs.
At minimum, the study shall consider the UE Radio Capabilities related aspects and any other optimisation which is deemed necessary in collaboration with RAN WGs. The study also considers scenarios where the UE radio capabilities change based on various events triggered in NAS (e.g. when certain services are not supported in one system/access and the UE wants to stay registered in another system/access, the UE may disable the radio capability for accessing the first system).

full Table of Contents for  TR 23.743  Word version:   16.0.0

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1  Scope  Word-p. 7
2  References  Word-p. 7
3  Definitions and abbreviations  Word-p. 8
4  Architectural Requirements and Assumptions  Word-p. 8
5  Key Issues  Word-p. 8
5.1  Key Issue #1: How are the UE Radio Capabilities identified?  Word-p. 8
5.2  Key Issue #2: Where are the UE radio capabilities stored?  Word-p. 9
5.3  Key Issue #3: How are the UE radio capabilities managed?  Word-p. 9
6  Solutions  Word-p. 10
6.1  Solution #1: UE manufacturer-specific UE capability ID  Word-p. 10
6.2  Solution #2: UE capability ID indicated in Access Stratum and N2  Word-p. 10
6.3  Solution #3: Solution using Hash-based Identification of UE radio capabilities  Word-p. 15
6.4  Solution #4: Provisioning of UE Radio Capability using UDR  Word-p. 17
6.5  Solution #5: UE radio capability reporting and management using UE-capability-ID  Word-p. 20
6.6  Solution #6: UE capability ID indicated in Access Stratum and N2 and local RAN Storage  Word-p. 23
6.7  Solution #7: Retrieve UE Radio Capability and store it in AMF per UE Capability ID  Word-p. 29
6.8  Solution #8: Solution for identifying UE radio capabilities using PLMN-specific UE Capability ID  Word-p. 32
6.9  Solution #9: UE Capability ID with delta set of UE Radio Capabilities  Word-p. 33
6.10  Solution #10: Solution based on network-controlled capabilities sending and UE Capability ID allocation  Word-p. 35
6.11  Solution #11: Standardized UE Capability ID  Word-p. 42
6.12  Solution #12: Bulk Provisioning of UE Radio Capability from AF  Word-p. 43
6.13  Solution #13: "Self-learning" logic for progressive building of a dictionary  Up  Word-p. 46
6.14  Solution #14: RAN mapping of 'Capability Pointer' to Full UE capability with Backward Compatibility  Word-p. 47
6.15  Solution #15: Network assigned capability ID with AMFI and Hash fields  Word-p. 49
7  Evaluation  Word-p. 51
8  Conclusions  Word-p. 51
A  Maximum supportable information element size  Word-p. 55
B  Change history  Word-p. 56

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