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Open AccessArticle

A Self-Scrutinized Backoff Mechanism for IEEE 802.11ax in 5G Unlicensed Networks

Department of Information and Communication Engineering, Yeungnam University, Gyeongsan 38541, Korea
Department of Computer and Information Communication Engineering, Hongik University, Seoul 04066, Korea
Author to whom correspondence should be addressed.
Sustainability 2018, 10(4), 1201;
Received: 28 March 2018 / Revised: 10 April 2018 / Accepted: 12 April 2018 / Published: 16 April 2018
(This article belongs to the Special Issue 5G Mobile Services and Scenarios: Challenges and Solutions)
The IEEE 802.11ax high-efficiency wireless local area network (HEW) is promising as a foundation for evolving the fifth-generation (5G) radio access network on unlicensed bands (5G-U). 5G-U is a continued effort toward rich ubiquitous communication infrastructures, promising faster and reliable services for the end user. HEW is likely to provide four times higher network efficiency even in highly dense network deployments. However, the current wireless local area network (WLAN) itself faces huge challenge of efficient radio access due to its contention-based nature. WLAN uses a carrier sense multiple access with collision avoidance (CSMA/CA) procedure in medium access control (MAC) protocols, which is based on a binary exponential backoff (BEB) mechanism. Blind increase and decrease of the contention window in BEB limits the performance of WLAN to a limited number of contenders, thus affecting end-user quality of experience. In this paper, we identify future use cases of HEW proposed for 5G-U networks. We use a self-scrutinized channel observation-based scaled backoff (COSB) mechanism to handle the high-density contention challenges. Furthermore, a recursive discrete-time Markov chain model (R-DTMC) is formulated to analyze the performance efficiency of the proposed solution. The analytical and simulation results show that the proposed mechanism can improve user experience in 5G-U networks. View Full-Text
Keywords: 5G network; 5G unlicensed; IEEE 802.11ax; channel contention 5G network; 5G unlicensed; IEEE 802.11ax; channel contention
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Ali, R.; Shahin, N.; Bajracharya, R.; Kim, B.-S.; Kim, S.W. A Self-Scrutinized Backoff Mechanism for IEEE 802.11ax in 5G Unlicensed Networks. Sustainability 2018, 10, 1201.

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