IEEE 802.11e 增強型分散式通道存取方式之研究

在本論文中，我們研究探討IEEE802.11e 增強型分散式通道存取方式的運用原理，並提出改良方法，使改良後之增強型分散式通道存取方式有較好的即時傳輸特性。在我們新的增強型分散式通道存取方式中，我們只使用最需即時性且須有服務品質保證的語音及多媒體封包，由基地台來記憶最早註冊的最高優先權之移動終端，藉以減少傳輸種類及基地台註冊的方式來達到最即時性的無線傳輸。我們的研究有以下3點貢獻： (1) 從我們的模擬數據中可以得知，我們的方法在減少延遲時間上有良好的表現。 (2) 我們方法可以讓最先註冊的即時性封包得到最優先的傳輸。 (3) 我們的方法在重載環境下會有較好的表現我們相信運用本論文所提供的增強型分散式通道存取方式，可以讓語音及多媒體這些需要即時傳輸的封包得到較快速的傳送。

關鍵字

無線；增強型分散式通道存取方式

並列摘要

This thesis investigates the problems in IEEE802.11e enhanced distributed channel access. Analyzing proprietor of IEEE 802.11e enhanced distributed channel access and IEEE 802.11 Distributed Coordination Function real-time transmission characters, we propose a modificed priority method to improve performance of real-time transmission. In wireless communication, it is important for faster and reliable transmission. In our proposal, the polling and prioritize mechanisms are combined. At first, polling mechanism is used. The polling mechanism does not only wake up stations on cover range of access point but also make sure stations transmission type. Then, by referring Qos mechanism of IEEE 802.11e standard, we get a new priority scheme in wireless communication for802.11e. It can reduce the delay time and add system reliablity. Via simulations and comparison, the results tell us that the proposal achieves our research goals. There are three significant contributions in our proposal as follows: (1) Form the simulation results, our proposal does reduce the delay time as compared with others. (2) In the enhanced distributed channel access period, voice or media packets can getting faster transmission in our proposal. (3) Our proposal actually reduces real-time period and rises the reliability. The simulation results show that our proposed mechanism achieve better performance than the existent enhanced distributed channel access . It is believed that the results of our study in this thesis will be probably practical and efficient on applications of the enhanced distributed channel access.

並列關鍵字

EDCA ； REAL-TIME ； 802.11E

參考文獻

[1] Stefan Mangold, Philips Research, Sunghyun Choi , Guido R. Hiertz, Ole Klein, and Bernhard Walke, “Analysis of IEEE 802.11e for Qos support in Wireless Lans”, IEEE Wireless Communications, P40-50

[2] Jamal N. Al-Karaki and J. Morris Chang” A Simple Distributed Access Control Scheme for Supporting QoS in IEEE 802.11 Wireless LANs” IEEE Communications Society,P213-218

[6] Fang-Chen Cheng Jack M. Holtzman “QoS Performance Measure and System Design in Wireless ATM” IEEE P1745-1479

[7] Srikant Sharma Kartik Gopalan Ningning Zhu Pradipta De Gang Peng Tzi-cker Chiueh” Quality of Service Guarantee on 802.11 Networks” IEEE P99-104

[9] Wasan Pattara-Atikom and Prashant Krishnamurthy, Sujata Banerjee, Hewlett-Packard Laboratories, ”Distributed Mechanisms for Quality of Service in Wireless LANS” IEEE Wireless Communications • June 2003, P26-34

國際替代計量

IEEE 802.11e 增強型分散式通道存取方式之研究

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