Abstract
Over the last few years, the widespread use of wireless local area networks (WLANs) continues to gain more and more impetus. Due to the increase in variety of multimedia applications such as voice, video and gaming traffic, it is paramount to develop a mechanism for the quality of service (QoS) to support different types of traffic in WLAN. IEEE 802.11e was introduced to handle delay sensitive traffic using Enhance Distributed Coordination Function (EDCF) which is an extension of Distributed Coordination Function (DCF) to categorize traffic in different groups e.g. Real time and non real time traffic. In this paper, We investigate the impact of traffic handling techniques as part of medium access control (MAC) on the performance of WLAN. Firstly, we propose MAC level parameters settings, which are found the most suitable to WLAN in comparison with DCF and EDCF and then we propose a cognitive access point (CAP) which is based on novel approaches to assign proprieties on station level using the proposed algorithm and embedded Packet fragmentation technique in the Revised MAC parameters in cognitive access point mechanism. The benefits of the proposed approach is validated via experimental results using OPNET Modeler 17.5.
Highlights
Cognitive radio networks [1] are communication networks of adaptive nodes, which can change their behaviors according to environment
In 1997, IEEE802.11x [2] was introduced as a set of standards set up based on Distributed Coordination Function (DCF) and Point Coordination Function (PCF)
DCF is a mandatory component of the wireless networks, which supports nonreal time traffic while PCF is optional and only supports real time traffic in infrastructure based networks
Summary
Cognitive radio networks [1] are communication networks of adaptive nodes, which can change their behaviors according to environment. DCF is a mandatory component of the wireless networks, which supports nonreal time traffic while PCF is optional and only supports real time traffic in infrastructure based networks Within this regard, IEEE802.11e [3], which is based on Enhance Distributed Coordination Function (EDCF), was introduced to overcome the QoS issue in wireless networks. We propose a new scheme using a cognitive radio network approach and prove that this proposed scheme performs better than IEEE802.11e [4] to handle delay sensitive traffic. There are a number of studies done on cognitive radio networks for handling delay sensitive traffic [1]. We introduce cognitive access points based on our novel approach in which priorities are assigned to Traffic Categories (TC) and station levels using the proposed algorithm. 2) AIFSN is always less than AIFS and it holds high priority and contention windows containing random numbers which are used in calculation of time interval and the backoff time, where Backoff time= AIFS + Random [CWmin;CWmax]
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