Authors : Hyeopgeon Lee, Eunchul Park, Kiyoung Kim and Nam Kim
Abstract: The IEEE 802.15.4 standard which is widely used in wireless sensor networks, specifies Contention Access Period (CAP) and Contention Free Period (CFP). To access a channel, the IEEE 802.15.4 Medium Access Control (MAC) protocol employs Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA) to reduce the probability of collision. However, the probability of collision while gaining access to a channel is high when many active nodes are in CAP, further decreasing its performance. In this study, we propose a partitioned channel allocation scheme. To conduct performance analysis, we used an OPNET network simulator. Our proposed partitioned channel allocation scheme divides the CAP into two sub-periods. To connect to the PAN coordinator, nodes send association request messages to the PAN coordinator. The PAN coordinator then sends an association response message that is present in the Allocation Information of the CAP sub-period (AICAP). Thus, the nodes only use the AICAP to send data and the competition is thereby decreased. Our proposed partitioned channel allocation scheme by adapting the characteristics of IEEE802.15.4 LR-WPAN decreases the transmission delay and energy consumption, it is more efficient than the IEEE 802.15.4 LR-WPAN standard.
Hyeopgeon Lee, Eunchul Park, Kiyoung Kim and Nam Kim, 2018. Partitioned Channel Allocation Scheme for Collision Avoidance in IEEE 802.15.4 LR-WPAN. Journal of Engineering and Applied Sciences, 13: 2840-2844.