Differentiation between Different Traffic Categories Using Multi-level of Priority in DCF-WLAN

Performance Evaluation of 802.11 WLAN Scenarios in OPNET Modeler

“…Many researches have been done on the performance analysis of the MAC protocols of IEEE standards, most of them concentrating on the improvement of QoS parameters of wireless networks [8,9,10,12]. For instance, G. Bianchi et al [8], analyzed prioritization functions EDCA and DCF with differentiating contention window parameters and AIFS parameters against metrics like throughput, delay and also detailed level metric like per slot occupancy probability and he concluded that AIFS differentiation is better than CWmin differentiation.…”

“…It is evaluated that the performance of the background traffic is degraded because of multimedia traffic the effect of multimedia traffic on background traffic also considering packet reception power threshold of the receiver, so a new analytical model is proposed to improve the dependence of QoS parameters on background traffic. M. Ahmed et al [12] analyzed service differentiation mechanisms and proposed an analytical model that implements multilevel priority schemes to control throughput and delay of different traffic categories. A. Shklyaeva [7] evaluated that EDCF gives better throughput for multimedia traffic however suffering from higher number of collisions because of lesser size of contention window for voice and video type traffic.…”

A Practical Layer 3 Admission Control and Adaptive Scheduling (L3-ACAS) for COTS WLANs

“…A similar approach is proposed in [14] to apply the dynamic priority re-allocation scheme in EDCA MAC and controlled the number of active stations over a traffic category. An adaptive two-level priorities scheme is proposed in [15] to control the throughput and delay of the real-time traffic by adjusting the minimum contention window. The mathematical model of the proposed scheme shown that it can provide service differentiation.…”

“…• It provides ease of control and management by means of having a centralized access control at the gateway/router side. • In contrast to [6][7][8][9][10][11][12][13][14][15] which only offer simulation studies, L3-ACAS can be easily implemented using COTS hardware. This will be further discussed in the later section.…”