Saturation throughput analysis of IEEE 802.11 in the presence of non ideal transmission channel and capture effects

Abstract

In this paper, we provide a saturation throughput analysis of the IEEE 802.11 protocol at the data link layer by including the impact of both transmission channel and capture effects in Rayleigh fading environment. Impacts of both non-ideal channel and capture effects, specially in an environment of high interference, become important in terms of the actual observed throughput. As far as the 4-way handshaking mechanism is concerned, we extend the multi-dimensional Markovian state transition model characterizing the behavior at the MAC layer by including transmission states that account for packet transmission failures due to errors caused by propagation through the channel. This way, any channel model characterizing the physical transmission medium can be accommodated, including AWGN and fading channels. We also extend the Markov model in order to consider the behavior of the contention window when employing the basic 2-way handshaking mechanism.Under the usual assumptions regarding the traffic generated per node and independence of packet collisions, we solve for the stationary probabilities of the Markov chain and develop expressions for the saturation throughput as a function of the number of terminals, packet sizes, raw channel error rates, capture probability, and other key system parameters. The theoretical derivations are then compared to simulation results confirming the effectiveness of the proposed models.

Secure and Connected Wearable Intelligence for Content Delivery at a Mass Event: A Case Study

“…Ultimately, it can offer up to 90% of spectral efficiency for as many as 5-10 devices [72]. In the scope of this research, conventional operation of WiFi does not fulfill the requirement of a high number of nodes from the efficiency or from the interference points of view [73].…”

A Comprehensive Performance Analysis of IEEE 802.11p based MAC for Vehicular Communications Under Non-saturated Conditions

“…The frame retry limit and back-off freezing were not considered in [8]. Several works followed Bianchi's model, which analyze the throughput and delay of IEEE 802.11 DCF under saturated traffic with some improvement of the principle [9,10]. In [9], the authors extended Bianchi's model by taking the frame retry limits into consideration.…”

“…Freezing of the back-off timer was not taking into consideration in [9], which means that the nodes were not aware of channel status and the estimation of channel access was not accurate. Bianchi's model was also extended in [10] to analyze the saturation throughput, taking into account channel errors and capture effects.…”

A Faired Quality of Service Assured MAC Protocol for Mobile ADHOC Network & Its Performance Evaluation

“…A lot of works has been carried out to evaluate the performance of IEEE 802.11 DCF over ideal error-free channel. Earlier studies [25][26][27] have presented the influence of the physical layer on the MAC layer performance.…”