In response to a request from a source cell, a target cell allocates resources for a user equipment (UE) to establish a connection with that target cell. The target cell sends to the source cell a) a set of RRC parameters that identify the allocated resources and b) an indication of a validity time the set of RRC parameters are valid for establishing the connection. The source cell sends the UE an autonomous user equipment mobility (AUM) configuration (including the set of RRC parameters) and an indication of a validity time during which the AUM configuration remains valid for establishing the connection with the target cell associated with that AUM configuration. The UE stores the AUM configuration and the validity time in its local memory, and utilizes the AUM configuration to establish a connection with the target cell only if the validity time is not expired.