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Chih‐Heng Ke Chih‐Cheng Wei Kawuu W. Lin Jen‐Wen Ding 《International Journal of Communication Systems》2011,24(8):1033-1048
Based on the standardized IEEE 802.11 Distributed Coordination Function (DCF) protocol, this paper proposes a new backoff mechanism, called Smart Exponential‐Threshold‐Linear (SETL) Backoff Mechanism, to enhance the system performance of contention‐based wireless networks. In the IEEE 802.11 DCF scheme, the smaller contention window (CW) will increase the collision probability, but the larger CW will delay the transmission. Hence, in the proposed SETL scheme, a threshold is set to determine the behavior of CW after each transmission. When the CW is smaller than the threshold, the CW of a competing station is exponentially adjusted to lower collision probability. Conversely, if the CW is larger than the threshold, the CW size is tuned linearly to prevent large transmission delay. Through extensive simulations, the results show that the proposed SETL scheme provides a better system throughput and lower collision rate in both light and heavy network loads than the related backoff algorithm schemes, including Binary Exponential Backoff (BEB), Exponential Increase Exponential Decrease (EIED) and Linear Increase Linear Decrease (LILD). Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
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对光分组交换中波长共享(SPC)、链路共享(SPL)和节点共享(SPN)的结构进行了理论分析,推导出三种结构的丢包率公式,并对其系统丢包率与负载、输入光纤端口数和每纤波长数的关系进行了数值计算。结果表明:在相同的波长转换器数目(没有达到极限值)时,SPN结构的丢包率低于SPL的丢包率,并且在接近极限值时,SPN结构所需要的波长转换器数目也小于SPL结构所需要的波长转换器数目。 相似文献
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We report two experiments in which errors and interaction latencies were recorded during routinization of hierarchically structured computer-based tasks. Experiment 1 demonstrates that action selection is slowed at subtask transitions, especially when selecting lower frequency actions. This frequency effect is compounded by concurrent performance of a secondary, attentionally demanding, task. Experiment 2 replicates these results in a more complex task and further demonstrates that the effects are reduced by experience. Several other factors were also found to affect latencies, including the availability of an external disambiguation cue and the temporal distance over which task context needs to be internally maintained. The results support a “dual-systems” account of action selection in which a “routine” system, sensitive to frequency, context, and experience, is selectively modulated by an attentionally demanding “nonroutine” system. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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一种基于竞争节点估计的改进DCF机制 总被引:1,自引:0,他引:1
对于多跳Mesh网络特有的树状拓扑,距离网关不同跳数的路由器所承载的网络流量不尽相同,与周围节点的竞争情况也不一致,由此传统802.11的DCF机制并不适用。提出了一种基于竞争节点估计的竞争窗调整机制,即利用节点分布式地获取各自的条件碰撞概率,并由此估算其竞争节点个数,在此基础上由最优最小竞争窗与竞争节点个数的关系函数,调整竞争窗大小来提高Mesh网络的总体性能。采用OPNET仿真结果表明,优化后的饱和系统吞吐量可提高70~80%,饱和时延可降低50%以上。 相似文献
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C. Yahaya M. S. Abd Latiff A. B. Mohamed 《International Journal of Communication Systems》2013,26(3):315-336
The exact contribution of this paper is a review of existing state‐of‐the‐art routing strategies for optical burst switched networks developed by researchers to deal with burst contention before it happens. Routing schemes are implemented in space domain, which make them simple and cost effective. Additionally, the paper points out the importance of routing as an effective way to deal with burst contention compared to other solutions. It also underlines the main differences between contention avoidance schemes and contention resolution techniques for optical burst switched networks. We believe that this review will help different optical burst switched researchers involved in the development of route optimization algorithms to control burst contention. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
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A modular upgrade design for packet transport switch nodes is presented where packet loss is dramatically reduced by intra‐module and inter‐module buffer sharing. This modular design offers significant cost and power reduction in a high‐data‐rate system where buffers are highly costly and power‐greedy. 相似文献
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