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).
As part of the study and in coordination with other WGs especially RAN WGs it should be concluded whether to proceed with normative work.
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.
: "Vocabulary for 3GPP Specifications".
: " System Architecture for the 5G System; Stage 2".
: "Common API Framework for 3GPP Northbound APIs".
: "NR; Radio Resource Control (RRC); Protocol specification".
: "Security architecture and procedures for 5G System".
: "General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access".
: "5G System; Principles and Guidelines for Services Definition; Stage 3".
: "Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification".