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Sensors 2017, 17(3), 492; doi:10.3390/s17030492

Performance Analysis of Different Backoff Algorithms for WBAN-Based Emerging Sensor Networks

1
Department of Electronics Engineering, Incheon National University, Incheon 406-772, Korea
2
Department of Computer Science, Govt. Postgraduate Jahanzeb College, Saidu Sharif, Swat 19130, Khyber Pakhtunkhwa, Pakistan
3
Department of Information and Communication Engineering, Inha University, Incheon 402-751, Korea
4
Department of Computer and Software Technologies, University of Swat, Swat 19130, Khyber Pakhtunkhwa, Pakistan
5
Department of Computer Science and Engineering, Incheon National University, Incheon 406-772, Korea
6
Department of Information and Telecommunication Engineering, Incheon National University, Incheon 406-772, Korea
*
Author to whom correspondence should be addressed.
Academic Editors: Giancarlo Fortino, Hassan Ghasemzadeh, Wenfeng Li, Yin Zhang and Luca Benini
Received: 15 November 2016 / Revised: 20 February 2017 / Accepted: 24 February 2017 / Published: 2 March 2017
(This article belongs to the Special Issue Advances in Body Sensor Networks: Sensors, Systems, and Applications)
View Full-Text   |   Download PDF [987 KB, uploaded 2 March 2017]   |  

Abstract

The Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) procedure of IEEE 802.15.6 Medium Access Control (MAC) protocols for the Wireless Body Area Network (WBAN) use an Alternative Binary Exponential Backoff (ABEB) procedure. The backoff algorithm plays an important role to avoid collision in wireless networks. The Binary Exponential Backoff (BEB) algorithm used in different standards does not obtain the optimum performance due to enormous Contention Window (CW) gaps induced from packet collisions. Therefore, The IEEE 802.15.6 CSMA/CA has developed the ABEB procedure to avoid the large CW gaps upon each collision. However, the ABEB algorithm may lead to a high collision rate (as the CW size is incremented on every alternative collision) and poor utilization of the channel due to the gap between the subsequent CW. To minimize the gap between subsequent CW sizes, we adopted the Prioritized Fibonacci Backoff (PFB) procedure. This procedure leads to a smooth and gradual increase in the CW size, after each collision, which eventually decreases the waiting time, and the contending node can access the channel promptly with little delay; while ABEB leads to irregular and fluctuated CW values, which eventually increase collision and waiting time before a re-transmission attempt. We analytically approach this problem by employing a Markov chain to design the PFB scheme for the CSMA/CA procedure of the IEEE 80.15.6 standard. The performance of the PFB algorithm is compared against the ABEB function of WBAN CSMA/CA. The results show that the PFB procedure adopted for IEEE 802.15.6 CSMA/CA outperforms the ABEB procedure. View Full-Text
Keywords: emerging sensor networks; WBAN; MAC protocols; backoff algorithm; IEEE 802.15.6; analytical model emerging sensor networks; WBAN; MAC protocols; backoff algorithm; IEEE 802.15.6; analytical model
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MDPI and ACS Style

Khan, P.; Ullah, N.; Ali, F.; Ullah, S.; Hong, Y.-S.; Lee, K.-Y.; Kim, H. Performance Analysis of Different Backoff Algorithms for WBAN-Based Emerging Sensor Networks. Sensors 2017, 17, 492.

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