Abstract
In the IEEE 802.11 wireless LANs, the bandwidth is not fairly shared among stations due to the distributed coordination function (DCF) mechanism in the IEEE 802.11 MAC protocol. It introduces the per-flow and per-station unfairness problems between uplink and downlink flows, as the uplink flows usually dominate the downlink flows. In addition, some users may use greedy applications such as video streaming, which may prevent other applications from connecting to the Internet. In this article, we propose an adaptive cross-layer bandwidth allocation mechanism to provide per-station and per-flow fairness. To verify the effectiveness and scalability, our scheme is implemented on a wireless access router and numerous experiments in a typical wireless environment with both TCP and UDP traffic are conducted to evaluate performance of the proposed scheme.
Highlights
Nowadays, the IEEE 802.11 [1] wireless local area networks (WLANs) have become the common network infrastructure for most organizations
Proposed work we describe our proposed scheme named ‘a Wireless LAN Adaptive Traffic Control (WLANATC)’ for solving the unfair bandwidth allocation problem of the wireless uplink and downlink traffic, and per-station fairness
Evaluation To verify the effectiveness and scalability of our proposed scheme, we performed numerous experiments which can be categorized into six parts: (1) finding an appropriate contention window for the wireless access router, (2) per-station fairness of inter-greedy downlink-only traffic, (3) fairness of uplink and downlink flows, (4) fairness
Summary
The IEEE 802.11 [1] wireless local area networks (WLANs) have become the common network infrastructure for most organizations. The bandwidth may not be shared among users in the same WLAN, because some users may utilize greedy applications that consume much larger bandwidth and prevent other applications from connecting to the Internet. These applications include, for example, video streaming applications, download accelerators that create many sessions for each download, and the P2P applications such as BitTorrent. Traffic from wireless stations mounting denial-of-service (DoS) attacks or infected by a virus may overwhelm the network. This problem is crucial for the wireless network environments since the bandwidth is very scarce. If it does not receive the ACK packet during a timeout period, it will assume that collision occurs and retransmit after waiting for a backoff time as in (1)
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