Methods and apparatus of ltm supervise procedure

Abstract

Apparatus and methods are provided for supervised L1/L2-triggered mobility (LTM) cell switch. In one novel aspect, supervised LTM is performed by the UEs. In one embodiment, an LTM timer is preconfigured for the supervised LTM procedure. The UE starts the LTM timer upon receiving the cell switch command and monitors the process with the LTM timer. When the LTM timer expires and the UE fails to switch to a target cell, a recovery procedure is triggered. In one embodiment, the UE sends LTM procedure success indication explicitly through a new RRC message, a MAC CE, or DCI; or implicitly indicated by a HARQ ACK for a first downlink transmission, a first PUSCH transmission, or a first UL transmission through a PUSCH/PUCCH. In one embodiment, the recovery procedure performs an RRC re-establishment, or performs a failure recovery before the RRC re-establishment.

Dependencies are inferred from the claim text.