A central challenge in ad hoc networks is the design ofrouting protocolsthat can adapt their behaviorto frequentand rapid changes in the network. The performance ofproactive and reactive routing protocols varies with networkcharacteristics, and one protocol may outperformthe other in different network conditions. The optimalrouting strategy depends on the underlying network topology,rate of change, and traffic pattern, and varies dynamically.This paper introduces the Sharp Hybrid AdaptiveRouting Protocol (SHARP), which automatically finds thebalance point between proactive and reactive routing byadjusting the degree to which route information is propagatedproactively versus the degree to which it needsto be discovered reactively. SHARP enables each nodeto use a different application-specific performance metricto control the adaptation of the routing layer. This paperdescribes application-specific protocols built on topof SHARP for minimizing packet overhead, bounding lossrate, and controlling jitter. Simulation studies show thatthe resulting protocols outperform the purely proactiveand purely reactive protocols across a wide range of networkcharacteristics.
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