Simulation-based comparison of three wireless multicast routing protocols: MOST, MOLSR and SMOLR
ADHOC-NOW'10 Proceedings of the 9th international conference on Ad-hoc, mobile and wireless networks
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Applications requiring the use of multicast such as militarybattlefield communication, rescue operations, conferencing,multi-user games, and context-aware applications, are becomingincreasingly successful. To ensure broad popularization of theseapplications, they should be available regardless of time and place. Because wireless mobile ad hoc networks can automaticallycreate a wide wireless network, which can extend an existingwired network, they are an ideal solution to support this conceptof multicast, anytime, anywhere. To provide multicast services for mobile ad hoc networks, many protocols have been proposed.Their internal mechanisms are different but all protocols strive toachieve the same goal: efficient and reliable multicast packetdelivery. However, there is often a trade-off between reliabilityand efficiency. Indeed, multicast packet delivery paths tend to become fragile with respect to mobility when they are optimizedfor bandwidth and become inefficient with respect to bandwidthwhen designed to be resilient to mobility. To improve the trade-offbetween efficiency and reliability, we use MPRs (multi point relays),the basic mechanism of OLSR for optimization, OLSR being onethe main RFC in IETF Manet WG. Our approach is to build multicastdelivery paths using MPRs to transmit multicast packets from multicast source to group members. Extensive simulation results shows thatthe proposed algorithm improves the reliability of multicasting with- out degrading noticeably the efficiency.