The performance of query control schemes for the zone routing protocol

In this paper, we study the performance of route query control mechanisms f or the Zone Routing Protocol (ZRP) for ad hoc networks. ZRP proactively mai ntains routing information for a local neighborhood (routing zone), while r eactively acquiring routes to destinations beyond the routing zone. This hy brid routing approach can be more efficient than traditional routing scheme s. However, without proper query control techniques, the ZRP cannot provide the expected reduction in the control traffic. Our proposed query control schemes exploit the structure of the routing zon e to provide enhanced detection and prevention of overlapping queries. Thes e techniques can be applied to single- or multiple-channel ad hoc networks to improve both the delay and control traffic performance of ZRP. Our query control mechanisms allow ZRP to provide routes to all accessible network n odes, with less control traffic than purely proactive link state or purely reactive route discovery, and with less delay than conventional flood searc hing.