Design of energy efficient medium access control (MAC) protocol for wireless sensor network (WSN) containing mobile nodes is a challenging task. Majority of the MAC protocols for wireless sensor networks assume static sensor nodes, which results in poor performance of such protocols in a network containing mobile nodes. In this paper we propose a MAC protocol which is energy efficient as well as suitable for a WSN containing mobile nodes. The proposed protocol is based on both TDMA and CSMA. It adjusts the frame size to adapt to the changes in mobility and traffic conditions. The performance of the proposed protocol has been compared with LEACH-C protocol. It outperforms LEACH-C in terms of average energy consumption, packet delivery ratio and network life time.978-1-4577-0031-6/11/$26.00 ©2011 IEEE

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Some of the vital issues that need to be addressed in wireless sensor network (WSN) based applications are improving the network lifetime without replacing the batteries of node and diminution of energy imbalanced hotspots in the network. Many protocols are proposed for energy efficient cluster based sensor network. In this paper, energy efficient Adaptive number of Frames per Round (AFR) protocol is proposed for a WSN where cluster heads are evenly distributed. The proposed AFR protocol combined with the cooperative Multiple Input Single Output (MISO) technique is extended for dual-hop wireless sensor networks to improve the network lifetime. The selection of the cooperative relay then explored so that the unexpected partition in network is avoided. Different cooperative relay positions have been investigated for decreasing and balancing the energy consumption in the network. Comparison is made for AFR protocol with and without dual-hop cooperative MISO scheme as well as with some other existing protocols.Index Terms-sensor network, cluster based, cooperative MISO, energy efficient, dual-hop.