On demand routing scheme for real-spatial information based group communication

Widespread high-performance mobile stations and wireless communication technologies make it possible to enjoy various network services anywhere at any time. In particular, social network services (SNSs) provide a wide variety of communication among users. We aim to achieve real-space communication that directly integrates information exchange and real-space activity in our daily lives. Therefore, we develop three subsystems: (i) gathering personal and location information of users, (ii) managing huge quantities of user information and creating a group of users on a request basis, and (iii) delivering a message for all users in a requested group. In this paper, we focus on the third subsystem, especially in a combinational configuration of wide-area wireless networks (WiMAX, LTE, and so on) and device-to-device (ad hoc) communication with WLANs. We assume that some users who should receive a message cannot use wide-area wireless networks due their inaccessible communication range or the occurrence of a disaster, and that supplemental device-to-device WLAN communication covers such users. Although multicast communication can provide effective message delivery to users in a group, the overhead increases with the increased number of messages multicast to many users and groups. We propose an on-demand routing scheme for group communication based on a real-spatial information system and evaluate the efficiency of the proposed scheme by a simulation.