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.

In this poster, we propose an authentication system, especially registration procedure, that can be used before and after a disaster. Using a two-tier HIDE, distributed authentications are done within each disrupted network segment without changing any user interface. To share the encrypted data among the users of this application at (8) of II-C, other types of encryption schemes are required. Attribute Base Encryption is one of these candidates and can be used as a smooth extension of the procedure described in this poster[7]. An actual implementation must be produced using an appropriate toolkit such as CCNx to evaluate the performance. This will be performed in future research. The work for this paper was performed in the context of the FP7/NICT EU-JAPAN GreenICN project.

During a disaster, it is important to exchange information such as the magnitude of the disaster and safety confirmation. However, the communication infrastructure, such as a mobile phone network, may not be available after a large-scale disaster because current communication infrastructures have centralized control structures. Thus, it is important to design a network that can maintain a normal service using the remaining network resources, such as base stations and user terminals, even if the central servers are no longer available because of disconnections among servers. In this study, we developed a distributed SNS service, or autonomous distributed network, based on named data networking (NDN) with two-tier hierarchical ID-based encryption (HIDE) for authentication. We conducted a simulation of a residential area in the suburbs of Tokyo to demonstrate the performance of this SNS application, where it was used to disseminate safety confirmation. We present the average message delivery time with different decision intervals, the synchronization intervals, and the ratios of moving people.