A novel MAC protocol of wireless LAN with high throughput and fairness

Abstract

In this paper, we propose a novel MAC scheme that dynamically optimizes each active node's backoff process. Through theoretical analysis, we find that the average channel idle interval can represent current network traffic load and then can used together with estimated number of nodes for setting optimal . Since necessary indexes can be obtained through direct measurement, our scheme will not increase any added load to networks, which makes our schemes simpler and more reliable when network traffic reaches saturated. Through simulation comparison with previous schemes, we show that our scheme can greatly improve the throughput no matter the network is in saturated or non-saturated case, while maintaining good fairness.

Estimating the Number of Nodes in WLANs to Improve Throughput and QoS

“…In this case, there is a difference between IEEE 802.11 and IEEE 802.11e for using OBEN shown in [11]. In EDCA, each node is not always in the same situation that all ACs of each node are saturated.…”

“…In [10], based on [8], to improve the problem of fairness which is important for real time communication, authors introduced a method to achieve better fairness but the improvement is not enough. In [11], authors proposed a novel protocol by observing the channel event to estimate the number of nodes and tuning the network to obtain high throughput with good fairness according to the number of nodes. This is proved to be effective.…”

“…Though, IEEE 802.11e EDCA (Enhanced Distributed Channel Access) supports QoS for traffics with different priorities. In this paper, we use the method in [11] to tune CW according to each priority to achieve good performance both on throughput and QoS. The related works [12]- [21] proposed several schemes to improve EDCA.…”