Performance Analysis of the IEEE 802.11 MAC Protocol over a WLAN with Capture Effect

“…11 DCF In this section, we use the approach described in our previous research work [5] to evaluate the throughput for a finite number of nodes in a slotted CSMA/CA system with the wireless channel model described above. In this paper, we assume that the average channel state duration time is greater than the packet transmission time.…”

Section: B Wireless Channel Modelmentioning

confidence: 99%

“…This behavior, called capture effect, can be analyzed by considering the spatial position of the nodes and wireless channel characteristics. In [5] the uniform spatial node distribution and the wireless channel characteristics are considered for the purpose of computing the capture probability, which is used to calculate the throughput of the IEEE 802.11 DCF MAC protocol. However, in [5] we ignore the channel noise and assume that the transmission is always successful if only one node transmits its packet.…”

Section: Introductionmentioning

confidence: 99%

Influence of Time-varying Channel on the Performance of IEEE 802.11 MAC Protocols

Zeng

2006

Proceedings of 15th International Conference on Computer Communications and Networks

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IEEE 802.11 is the most important standard for wireless local area networks (WLANs). In the IEEE 802.11 WLANs, distributed coordination function (DCF) is a fundamental medium access control (MAC) protocol, whose performance has been studied analytically in the literature. However, there is no research work that takes into account various incoming traffic load, network size, and the influence of transmission error at the same time. In this paper, a refined model is presented to evaluate the performance of DCF in a time-varying wireless channel. In this study, the wireless channel is modeled by a finite-state Markov (FSM) chain. In each channel state, the operation of the IEEE 802.11 DCF is modeled by an embedded Markov chain. Using these two Markov chains, the throughput of the IEEE 802.11 DCF can be very accurately calculated. The results show that the performance of DCF strongly depends on the network size, the incoming traffic loads, and the bit error rate (BER).

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“…This phenomenon is called the capture effect and can increase the probability of successful packet reception leading to improved system throughput. The capture effect in WLANs in the presence of multipath, shadowing and near far effects was investigated in [3] and [4]. In [3] the performance of wireless MAC protocols with Rayleigh fading, shadowing and capture effect was analysed.…”

Section: Introductionmentioning

confidence: 99%

Throughput and Delay Analysis for a Differentiated p-Persistent CSMA Protocol with the Capture Effect

Abukharis

MacKenzie

O’Farrell

2011

2011 IEEE 73rd Vehicular Technology Conference (VTC Spring)

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With the extensive deployment of 802.11 wireless local area networks (WLANs) and the need for better quality of service (QoS), the 802.11e MAC with service differentiation was developed. Analysing the effect of fading, shadowing and near-far effect on the performance of 802.11 is a fundamental consideration in practical situations since the wireless channels are errorprone. This paper develops a p-persistent CSMA protocol, which allows for service differentiation by using multiple traffic types, into an accurate and practical model that takes into account the capture effect in a Rayleigh multipath fading environment. A new analytical approach is developed to calculate the throughput and packet delay for multiple traffic types. Results provided for this new model show that the capture effect increases the throughput by 32% in a highly loaded system thereby demonstrating the importance of including the capture effect in wireless protocols.

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Performance Analysis of the IEEE 802.11 MAC Protocol over a WLAN with Capture Effect

Cited by 15 publications

References 10 publications

Performance evaluation of wireless sensor network with hybrid channel access mechanism

Performance evaluation of wireless sensor network with hybrid channel access mechanism

Influence of Time-varying Channel on the Performance of IEEE 802.11 MAC Protocols

Throughput and Delay Analysis for a Differentiated p-Persistent CSMA Protocol with the Capture Effect

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