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Multi-Hop MAC Protocol for Wireless Sensor Networks  

Cho, Kyong-Tak (서울대학교 전기컴퓨터공학부, 뉴미디어통신공동연구소)
Bahk, Sae-Woong (서울대학교 전기컴퓨터공학부, 뉴미디어통신공동연구소)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.34, no.6A, 2009 , pp. 506-514 More about this Journal
Abstract
To minimize energy consumption, most of MAC Protocols in WSNs exploit low duty cycling. Among those, RMAC [4] allows a node to transmit a data packet for multiple hops in a single duty cycle, which is made possible by exploiting a control frame named Pioneer (PION) in setting up the path. In this paper, we present a MAC Protocol called Hop Extended MAC (HE-MAC) that transmits the data packet for more multiple hops in a single duty cycle. It employs an EXP (Explorer) frame to set up the multiple hop transmission, which contains the information of the maximum hop that a packet can be transmitted. With the use of the information in EXP and an internal state of Ready to Receive (RTR), HEMAC extends the relay of the packet beyond the termination of the data period by two more hops compared to RMAC. Along with our proposed adaptive sleeping method, it also reduces power consumption and handles heavy traffic efficiently without experiencing packet inversion observed in RMAC. We analytically obtain the packet delivery latency in HE-MAC and evaluate the performance through ns-2 simulations. Compared to RMAC, HE-MAC achieves 14% less power consumption and 20% less packet delay on average for a random topology of 300 nodes.
Keywords
Wireless Sensor Networks; MAC Protocol; Duty Cycling;
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  • Reference
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