Adaptive MAC Protocol for Throughput Enhancement in Multihop Wireless Networks

Nam Pham, Jong-Hoon Youn


In the paper, by combining a fixed scheduling scheme with a simple p-persistent approach, we propose a dynamic transmission scheduling protocol for multi-hop wireless networks. In a fixed scheduling scheme, a predetermined schedule is assigned to each wireless node before transmitting data, and this schedule will be used permanently. However, in the proposed protocol, an adaptive probability-based approach is used in order to reduce the number of collisions. When a node is ready to send, it calculates the transmission probability pnew, using a successful transmission ratio, a previous transmission probability pold, and a queue utilization ratio. The transmission probability pnew determines whether or not a node can transmit. Our simulation study shows that the new MAC scheduling scheme improves the network throughput and reduces the number of collisions considerably.


TDMA, Dynamic Transmission Scheduling, p-persistent scheduling

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