Abstract
Wireless sensor networks are network of a large number of sensor nodes used for remote applications. To the expressive growth in remote sensor networks, medium access control (MAC) works faster in wireless sensor networks. The MAC protocol has to be appropriately designed to ensure the proper operation of the sensor nodes in WSNs. This paper provides energy saving by proposing group acknowledgement MAC (GACK-MAC) for an aggregated data frame transmitted to a single destination, and reducing the overhead in IEEE 802.15.4 beacon enabled wireless sensor networks. In our proposed scheme, type of acknowledgement of each sensor node is decided by the coordinator based on traffic load of the network or number of packets present in the sensor node. We performed this by adopting the star and peer-to-peer tree topologies with a coordinator having coordination with all other member nodes. Simulations are conducted, and compared with the analytical models constructed to measure the throughput, and delay metrics. Moreover, our method enhances the battery lifetime by 35% on average, throughput of 42% at maximum, and decrease the delay by 33% for each packet in network of star topology and twice the above mentioned values for battery lifetime, throughput and reduces the delay by 49% in P2P topology of wireless sensor networks.
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