Anastasopoulos Markos P, Petraki Dionysia K, Kannan Rajgopal, Vasilakos Athanasios V
Wireless and Satellite Communications Group, Division of Information Transmission Systems and Materials Technology, School of Electrical and Computer Engineering, National Technical University of Athens, 15780 Athens, Greece.
IEEE Trans Syst Man Cybern B Cybern. 2010 Jun;40(3):647-55. doi: 10.1109/TSMCB.2009.2036148. Epub 2010 Jan 15.
The high-frequency segment (10-66 GHz) of the IEEE 802.16 standard seems promising for the implementation of wireless backhaul networks carrying large volumes of Internet traffic. In contrast to wireline backbone networks, where channel errors seldom occur, the TCP protocol in IEEE 802.16 Worldwide Interoperability for Microwave Access networks is conditioned exclusively by wireless channel impairments rather than by congestion. This renders a cross-layer design approach between the transport and physical layers more appropriate during fading periods. In this paper, an adaptive coding and modulation (ACM) scheme for TCP throughput maximization is presented. In the current approach, Internet traffic is modulated and coded employing an adaptive scheme that is mathematically equivalent to the replicator dynamics model. The stability of the proposed ACM scheme is proven, and the dependence of the speed of convergence on various physical-layer parameters is investigated. It is also shown that convergence to the strategy that maximizes TCP throughput may be further accelerated by increasing the amount of information from the physical layer.
IEEE 802.16标准的高频段（10 - 66吉赫兹）似乎有望用于实现承载大量互联网流量的无线回程网络。与很少出现信道错误的有线骨干网络不同，IEEE 802.16全球微波接入互操作性网络中的TCP协议完全受无线信道损伤的制约，而非拥塞。这使得在衰落期间，传输层和物理层之间采用跨层设计方法更为合适。本文提出了一种用于最大化TCP吞吐量的自适应编码调制（ACM）方案。在当前方法中，采用一种在数学上等同于复制者动态模型的自适应方案对互联网流量进行调制和编码。证明了所提出的ACM方案的稳定性，并研究了收敛速度对各种物理层参数的依赖性。还表明，通过增加来自物理层的信息量，可以进一步加速向最大化TCP吞吐量的策略收敛。
