Some techniques and apparatuses described herein enable synchronization of a user equipment (UE) identifier between a UE and a base station upon UE identifier reallocation, which enables the UE to use preconfigured uplink resources to reduce latency, reduce signaling overhead, or the like. For example, some techniques and apparatuses described herein enable the UE to use preconfigured uplink resources when a UE identifier reallocation occurs between preconfigured uplink resource configuration and use of the preconfigured uplink resources by the UE to transmit uplink data.