MASA+: An Improved MAC Scheme Based on MASA Algorithm

Multiple Access with Salvation Army Protocol (MASA) achieves the higher aggregate throughput than IEEE802.11DCF via packet salvaging at the MAC layer. The implementation of MASA is based on DCF specification. But the back off timer of SACK in MASA is different from that of DATA in DCF. The MASA selects (0, NAV) as the back off range of SACK, whereas DCF thinks the channel is busy in this duration. In Ad Hoc network, DCF is the most widely used MAC protocol, to the full extent of keeping compatible with DCF and retaining the merit of MASA, this paper proposes an Improved MAC scheme called MASA+. The simulation based on NS-2 shows that new scheme outperforms DCF in aggregate throughput.