Study on timing resiliency and TSC and URLLC enhancements
The objective of this Technical Report is to study and perform an evaluation of potential architecture enhancements for supporting 5G Timing Resiliency and TSC & URLLC enhancements for 5G System (5GS). The following aspects are covered:
- Study how to report 5GS network timing synchronization status (such as divergence from UTC and 5GS network timing source degradation) to UEs and 3rd party applications (AFs):
- Study how RAN and 5GC learn about network 5GS network timing synchronization status to be able to inform UEs and AFs.
- Study if additional information needs to be provided to UEs and AFs to inform about 5GS network timing synchronization status.
- Study how to enable AFs to request time synchronization service in a specific coverage area and how to enforce the coverage area.
- Study how to control 5G time synchronization service based on subscription (i.e. introducing subscription parameter for time synchronization and enforcing it).
- Study how to enable an AF to explicitly provide PER to NEF/PCF.
- Study mechanisms for interworking with TSN transport networks. Study interworking mechanisms with TSN networks deployed in the transport network in order to support of E2E determinism and low latency communication and efficient N3 transmission.
- Study if there is a need for applications to adapt downstream scheduling in order for 5GS to meet really low latency (e.g. 2 msecs) requirement and if there is a need to have feedback from RAN (e.g. for application to consider DL packet transmission time slots to avoid buffering in the RAN) for this purpose.