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首页> 外文期刊>IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences >Improved Performance with Adaptive Dly-ACK for IEEE 802.15.3 WPAN over UWB PHY
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Improved Performance with Adaptive Dly-ACK for IEEE 802.15.3 WPAN over UWB PHY

机译：通过UWB PHY上的IEEE 802.15.3 WPAN的自适应Dly-ACK改善性能

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摘要

Dly-ACK scheme in IEEE 802.15.3 MAC is designed to reduce the overhead of the ACK frame in MAC layer and improve the channel utilization. However, how to using the Dly-ACK is open for implementation. In this paper, we propose an adaptive Dly-ACK scheme for both TCP and UDP traffic. We first point out the problems of applying fixed Dly-ACK scheme to these two traffic scenarios and show that the system performance is rather poor and the causes of these problems are presented. Based on our observations, two enhancement mechanisms for fixed Dly-ACK are then proposed. The first one is to request the Dly-ACK frame adaptively or change the burst size of Dly-ACK according to the transmitter queue status. The second is a retransmission counter to enable the destination DEV to deliver the MAC data frames to upper layer timely and orderly. Simulation results show that, with our enhancements, the system performance can be improved significantly compared with the conventional Imm-ACK and fixed Dly-ACK. We also investigate the impacts of some important parameters such as the buffer size on the system performance. Some important guidelines for the Dly-ACK design are given. Finally, it is worth to point out that our Dly-ACK enhancements are compatible with the standard and it is transparent to the upper layer protocols, i.e., either UDP or TCP.
机译：IEEE 802.15.3 MAC中的Dly-ACK方案旨在减少MAC层中ACK帧的开销并提高信道利用率。但是，如何使用Dly-ACK已实现。在本文中，我们针对TCP和UDP流量提出了一种自适应Dly-ACK方案。我们首先指出了将固定的Dly-ACK方案应用于这两种流量方案的问题，并表明系统性能相当差，并提出了造成这些问题的原因。基于我们的观察，然后提出了两种针对固定Dly-ACK的增强机制。第一个是根据发射机队列状态自适应地请求Dly-ACK帧或更改Dly-ACK的突发大小。第二个是重传计数器，使目标DEV能够及时有序地将MAC数据帧传递到上层。仿真结果表明，通过我们的增强，与传统的Imm-ACK和固定Dly-ACK相比，系统性能可以得到显着改善。我们还研究了一些重要参数的影响，例如缓冲区大小对系统性能的影响。给出了Dly-ACK设计的一些重要准则。最后，值得指出的是，我们的Dly-ACK增强功能与该标准兼容，并且对上层协议（即UDP或TCP）透明。

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