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  A Phy/Mac Layer Mechanism to Improve Aggregation in WLANs  
  Authors : Anjaly Kurian; Gnana Sheela K
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In recent years, the growth of WLANs (Wireless Local Area Networks) is very high and it has become the common means of access to the internet. The proliferation of Wi-Fi based WLANs/Wi-Fi hotspots in public places enables ubiquitous internet access. The public places are referred to as large audience environments, in which each Wi-Fi access point (AP) normally serves a crowd of mobile stations (STAs) simultaneously. The performance of those Wi-Fi hotspots is extremely poor in terms of low throughput and severe delay. After carefully investigating the traffic characteristics in Wi-Fi hotspots the studies shows that the main causes of such poor performance are media access control (MAC) inefficiency and downlink-uplink traffic asymmetry. To cope with these issues, the key idea is pooling, which facilitates, an access point (AP) to pool frames for multiple STAs in a single transmission. It reduces contention overhead in downlink transmission and conveys more frames in each channel access. As such, each downlink transmission carries more payloads for multiple receivers, it enables in time response for multiple STAs concurrently in a single transmission and thus improves MAC efficiency and solves traffic asymmetry simultaneously.


Published In : IJCSN Journal Volume 5, Issue 1

Date of Publication : February 2016

Pages : 66-70

Figures :05

Tables : --

Publication Link : A Phy/Mac Layer Mechanism to Improve Aggregation in WLANs




Anjaly Kurian : completed her B.Tech in Electronics and Communication Engineering under Mahatma Gandhi University,Kerala. Presently she is pursuing M.Tech in Electronics with specialization in Wireless Technology under Cochin University of Science and Technology (CUSAT),Kerala.

Gnana Sheela K : received her Ph.D in Electronics and Communication from Anna University, Chennai. She is working as a Professor, Department of ECE, Toc H Institute of Science and Technology. She has published more than 40 international journal papers. She is reviewer, editor and evaluator in various international papers. Also she is life member of ISTE.








MAC Efficiency

Frame Aggregation

Contention Reduction



IEEE 802.11


In this paper, we investigated the characteristics of Wi-Fi traffic in large audience environments and found that pooling is a promising approach to scale the performance of Wi-Fi in crowded public places. We observe that by enabling frame pooling for multiple STAs in the downlink transmission, the main causes of poor Wi-Fi performance in large audience environments can be addressed simultaneously. T he proposed pooling design facilitates a new dimension to improve the efficiency of public Wi-Fi networks. Pooling is built on the heels of a lightweight frame structure in the existing Wi-Fi standards as an optional mechanism that is enabled in large audience environments to ease heavy contention.










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