ETRI moves NR-NTN mobility work from study request to Release 20 proposal

At RAN2 #135, ETRI asked to study enhancements, while at RAN2 #135-bis it proposed enhancing existing procedures for Release 20. RAN2 is the working group for radio interface protocols, covering layer 2 and radio resource control (RRC). ETRI says mobility and measurement impacts were agreed at RAN2 #135. Its later proposal seeks to address those impacts by enhancing existing procedures. At RAN2 #135, ETRI wrote: "No new measurement event type or new mobility procedure is preferred from ETRI perspectives."

Source: R2-2605081, ETRI, 3GPP TSG RAN WG2 #135. © ETRI.

Its earlier list names Event D1/D2, CondEvent D1/D2, conditional handover, reconfiguration with sync, satellite switch, cell reselection and resume. Event D1/D2 are measurement event labels, and CondEvent D1/D2 are conditional event labels. The later list keeps the same procedures, but calls the switch "satellite switch with re-synchronisation". Reconfiguration with sync involves synchronization, while re-synchronisation explicitly qualifies the later satellite switch.

Source: R2-2607302, ETRI, 3GPP TSG RAN WG2 #135-bis. © ETRI.

Global navigation satellite system (GNSS) resilience concerns operation despite degraded or unavailable satellite positioning. The RAN2 #135-bis contribution register lists ETRI's paper as available and records no decision on it. The RAN2 #135 contribution register also records no decision on ETRI's earlier request.