A Beacon-Based Collision-Free Channel Access Scheme for IEEE 802.11 WLANs

M. F. Tuysuz, H. A. Mantar

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


In IEEE 802.11 based WLAN standard, distributed coordination function is the fundamental medium access control (MAC) technique. It employs a CSMA/CA with random binary exponential backoff algorithm and provides contention-based distributed channel access for stations to share the wireless medium. However, performance of this mechanism drops dramatically due to random structure of the backoff process, high collision probability and frame errors. That is why development of an efficient MAC protocol, providing both high throughput for data traffic and quality of service (QoS) support for real-time applications, has become a major focus in WLAN research. In this paper, we propose an adaptive beacon-based collision-free MAC adaptation. The proposed scheme makes use of beacon frames sent periodically by access point, lets stations enter the collision-free state and reduces the number of idle slots regardless of the number of stations and their traffic load (saturated or unsaturated) on the medium. Simulation results indicate that the proposed scheme dramatically enhances the overall throughput and supports QoS by reducing the delay, delay variation and dropping probability of frames.
Original languageEnglish
Pages (from-to)155-177
Number of pages23
JournalWireless Personal Communications
Issue number1
Early online date27 Aug 2013
Publication statusPublished - Mar 2014
Externally publishedYes


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