A new link layer protocol for wireless correlated fading channels
A new link layer protocol for wireless correlated fading channels
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一种新的无线相关衰落信道链路层协议
DOI：
10.1109/vetecf.2003.1285276
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
Sajal K. Das
中科院分区：
文献类型：
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作者：
Haitao Lin;Sajal K. Das
互联网接入预计将成为未来无线网络的主要数据服务。然而，在这种网络中，典型的无线相关衰落信道对TCP性能非常不利。进一步的挑战来自于衰落速率的变化，这就需要一种高效的链路层协议来适应这些变化，提高TCP的传输性能。在本文中，我们首先研究了支持TCP的不同RLP（无线电链路协议）重传方案的性能。仿真结果表明，在不同的衰落速率下，单一重传方案在吞吐量方面并不能产生最佳性能。基于这一观察，我们提出了一种自适应链路层协议（ALLP），用于未来的无线网络，该协议具有衰落速率检测器来估计信道衰落速率。ALLP根据估计的信道衰落率自适应调整其重传方案，以获得最佳的数据传输性能。仿真结果表明，ALLP既能提高特定移动主机的性能，又能提高无线网络的总吞吐量。
Internet access is expected to be the main data service in future wireless networks. However, the typical wireless correlated fading channels are found very unfriendly to TCP performance in such networks. Further challenge comes from the variations in fading rate, which demands an efficient link layer protocol that can adapt to the variations and improve the TCP transmission performance. In this paper, we first study the performance of different RLP (radio link protocol) retransmission schemes in supporting TCP. Through simulation results, we show that a single retransmission scheme does not yield the best performance in terms of throughput with different rates of fading. Based on this observation, we propose an adaptive link layer protocol (ALLP) for the future wireless networks that has a fading rate detector to estimate the channel fading rate. Based on the estimated channel fading rate, ALLP adaptively adjusts its retransmission schemes to achieve the optimal data transmission performance. Simulation results show that ALLP can improve both the performance of a particular mobile host and the total throughput of wireless networks.