Collision avoidance multiple access in wireless sensor networks

Collision avoidance multiple access plays an important role in wireless sensor networks, especially for those composed of nodes having a simple access protocol functionality. Numerous protocols have been proposed for wireless sensor networks during the past decades. However, the majority of these proposals require too much actions to be taken by sensor nodes, which makes the sensor nodes too complex. In this paper, we focus on the sensor networks composed of simple function nodes and presented novel collision avoidance multiple access algorithms. Both suggested algorithms are based on two functional stages: the channel allocation stage and the actual data transmission by using TDMA and/or CDMA. Simulation results indicate that our algorithms significantly improve communication efficiency via collision avoidance scheme, comparing to existing proposals. In reference to this improvement, we will also address user-fairness of our algorithms. ? 2007 IEEE.EI