Always-Connected Enablement Base Station to eliminate the effects of RRC transitions delay

With the 5th Generation mobile communication system (5G), ultrahigh capacity and ultralow latency communication are realized. Toward the next generation, i.e., 6th Generation mobile communication system (6G), even higher capacity or lower latency is needed. This paper focuses on the significant processing delay in the control plane when a User Equipment (UE) state transitions from Radio Resource Control (RRC)-IDLE to RRC-CONNECTED. On the transition, many interactions exist between a UE and a Base Station (BS) or a mobile core system, such as a connection establishment or context data exchange. We propose eliminating the effect of processing delay by introducing an Always-Connected Enablement BS (ACE-BS). We conduct experiments in an actual local 5G environment with UEs, BSs, and mobile cores, demonstrating the low latency communication by using the ACE-BS.