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首页> 外文会议>International Wireless Communications and Mobile Computing Conference >New Adaptive 802.11 MAC Protocol to Enhance Throughput and Fairness in Multihop Wireless Networks
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New Adaptive 802.11 MAC Protocol to Enhance Throughput and Fairness in Multihop Wireless Networks

机译：新的Adaptive 802.11 MAC协议，以提高多跳无线网络中的吞吐量和公平性

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Multihop Wireless Networks (MWNs) suffer from contention over the medium between nodes, resulting in a decrease of end-to-end throughput. Also, nodes with multiple hops away from the gateway experience additional throughput degradation caused by high collisions from competing nodes, resulting in more packet loss. It has been shown that packets' fragmentation at the (Medium Access Control) MAC layer plays an important role in improving nodes' throughput. Inspired by this idea, we propose an algorithm to estimate more suitable fragmentation threshold for various nodes in the network based on their locality. Although various fragmentation thresholds achieve better end-to-end throughput, it does not improve the fairness problem in such networks. To address the fairness problem, we propose changing also the transmission rates to nodes across the network. In this work, we propose a new scheme called Adaptive Transmission Rate and Fragmentation Size (ARFS) that can be implemented on top of the 802.11 MAC protocol. ARFS computes the collision probability of each node based on its interfering range and its distance from the gateway. It then uses these values as weights to compute new fragmentation threshold and transmission rate of each node in the MWN. We show that ARFS significantly outperforms the standard 802.11 MAC protocol in regarding fairness and end-to-end throughput.
机译：多跳无线网络（MWNS）遭受节点之间介质的争用，导致端到端吞吐量的降低。此外，带有多个跳跃远离网关的节点体验由竞争节点的高碰撞引起的额外吞吐量劣化，从而产生更多的数据包丢失。已经表明，在（中访问控制）MAC层处的分组的碎片在提高节点吞吐量方面发挥着重要作用。灵感来自这种想法，我们提出了一种算法来估计基于其局部性的网络中各种节点的更合适的碎片阈值。虽然各种碎片阈值达到更好的端到端吞吐量，但它不会改善这种网络中的公平问题。为了解决公平问题，我们建议在网络上改变传输速率到节点。在这项工作中，我们提出了一种称为自适应传输速率和碎片大小（ARF）的新方案，可以在802.11 MAC协议之上实现。 ARF基于其干扰范围和距网关的距离计算每个节点的碰撞概率。然后，它将这些值用作权重，以计算MWN中每个节点的新碎片阈值和传输速率。我们表明ARFS在公平和端到端吞吐量中显着优于标准的802.11 MAC协议。

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