Boosting the performance of an adaptive push system in environments with locality of demand

In many data broadcasting applications, clients are grouped into several groups, each one located in a different region, with the members of each group having similar demands. This paper proposes a mechanism that exploits locality of demand in order to increase the perfor- mance of wireless data dissemination systems. Specifically, it trades the received energy per bit redundancy at distances smaller than the radius of the service area for an increased bit rate for transmission of items demanded by clients at such distances. This results to an increased transmission speed for many items. The bit rate for an item transmission is dynamically determined from the distance between the server's antenna to the group of clients that demand this item via a simple feedback from the clients. Simulation results are presented that reveal significant performance im- provement over fixed bit rate broadcasting in environments characterized by locality of client demands.