AHR

摘要

Real world MANET routing protocol implementations generally use layer three mechanisms for carrying out connectivity maintenance tasks. In many cases, such mechanisms are based on periodical transmission of Hello messages. When topology changes occur frequently, usage of higher Hello rates than default may lead to higher end-to-end connectivity and available bandwidth. However, in rather static conditions, low Hello rates are adequate to avoid unnecessary bandwidth and power consumption waste. In this paper we present Adaptive Hello Rate (AHR), a two-state adaptive mechanism for adjusting HELLO_INTERVAL parameter in AODV. We evaluate AHR by conducting a set of experiments in real ad-hoc testbeds. Results quantify the potential benefits and tradeoffs of the proposed solution.