Integrated cellular and ad hoc relaying systems: iCAR

Integrated cellular and ad hoc relaying systems (WAR) is a new wireless sys tem architecture based on the integration of cellular and modem ad hoc rela ying technologies. It addresses the congestion problem due to unbalanced tr affic in a cellular system and provides interoperability for heterogeneous networks. The WAR system can efficiently balance traffic loads between cell s by using ad hoc relaying stations (ARS) to relay traffic from one cell to another dynamically. This not only increases the system's capacity cost ef fectively, but also reduces transmission power for mobile hosts and extends system coverage. In this paper, we compare the performance of the WAR syst em with conventional cellular systems in terms of the call blocking/droppin g probability, throughput, and signaling overhead via analysis and simulati on. Our results show that with a limited number of ARSs and some increase i n the signaling overhead (as well as hardware complexity), the call blockin g/dropping probability in a congested cell and the overall system can be re duced.