Improvement of Throughput by User Cooperative Mobility with Restricted Position in Ad-Hoc Networks

In this paper, we evaluate the effectiveness of user cooperative mobility in ad-hoc networks with restriction that arise when the nodes are vehicles parked on side of the road. Conventional methods have been proposed to move nodes to proper positions in order to achieve the maximum throughput of the whole networks. However, in the case of ad-hoc networks utilizing parked vehicles, nodes are only allowed to move alongside roads. It is concerned that conventional user cooperative mobility methods would be useless, but no studies have mentioned this problem. In this study, we assume a service that vehicles parked on side of the road form an ad-hoc networks and provide wireless LANs service to neighboring pedestrians. We compare the throughput performances with and without the restriction. In a simple model where nodes are placed in uniform, we showed that the throughput with the restriction was improved by 50%. Furthermore, with ten thousand trials in a model where nodes are placed at random, we also showed that the throughput was improved by 52.8% on average. This result indicates that user cooperative mobility is effective even with restricted position.