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Recently designed cross-layer contention based synchronous MAC protocols likethe PRMAC protocol, for wireless sensor networks (WSNs) enable a node toschedule multi-hop transmission of multiple data packets in a cycle. However,these systems accommodate both the request-to-send data process and theconfirmation-to-send data process in the same data transmission schedulingwindow (i.e. data window). This reduces the length of the multi-hop flow setupin the data window. In a multi-hop scenario, this degrades both the packetdelivery ratio (PDR) and the end-to-end transmission delay (E2ETD). In thispaper, we propose a cross-layer contention based synchronous MAC protocol,which accommodates the request-to-send data process in the data window and theconfirmation-to-send data process in the sleep window for increased efficiency.We evaluate our proposed protocol through ns-2.35 simulations and compare itsperformance with the PRMAC protocol. Results suggest that in multi-hopscenario, proposed protocol outperforms PRMAC both in terms of the E2ETD andthe packet delivery ratio (PDR).

A Cross-layer Contention Based Synchronous MAC Protocol for Transmission Delay Reduction in Multi-Hop WSNs