Abstract
In this research, an Adaptive Distributed Inter Frame Space (ADIFS) has been proposed for IEEE 802.11 Medium Access Control (MAC) protocol. The aim of this approach is to improve Quality of Services (QoS) for IEEE 802.11 MAC protocol in single-hop wireless network. The proposed approach is based on traffic type, Collision Rate (CR), Collision Rate Variation (CRV) and Packet Loss Rate. These parameters are used to adjust the DIFS at runtime. The adjusted DIFS is employed to enhance service differentiation at the MAC layer in single-hop wireless networks. The proposed approach contributes to the enhancement of the average QoS for high priority traffic by 32.9% and 33.4% for the 5 and 10 connections, respectively. While the average QoS for the low priority traffic is improved by 14.3% and 18.2% for the 5 and 10 connections, respectively. The results indicate that, the proposed approach contributes in the enhancement of the QoS in wireless network.
Highlights
The random transmission of applications over the wireless medium may lead to incomprehensible or unpredictable results [1]
In the Adaptive Distributed Inter Frame Space (ADIFS) scheme, the Contention Window (CW) size is updated according to the Binary Exponential Backoff (BEB) procedure as defined by IEEE 802.11 Distributed Coordination Function (DCF)
In IEEE 802.11 DCF, the ACK frame is assigned as a higher priority over data packets by having a shorter Inter Frame Space (IFS) known as Short Inter Frame Space (SIFS), while data packets have a longer IFS known as DIFS (i.e. SIFS < DIFS)
Summary
The random transmission of applications over the wireless medium may lead to incomprehensible or unpredictable results [1]. The MAC protocol in wireless networks is a protocol that controls access to the shared medium, by applying. The IEEE 802.11 MAC Distributed Coordination Function (DCF) has two access techniques [5]. The minimum value is selected to be longer than the Short Inter Frame Space (SIFS) that is identified for control frames, such as an acknowledgement (ACK) frame, while the maximum value is chosen in order to minimize the wasted time slots by avoiding an excessively long defer of data packets. This paper is organized as follows: The previous studies for providing service differentiation are presented .
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