IEEE 802.16頻寬傳送訊息機制之比較

COMPARING BANDWIDTH REQUEST MECHANISMS IN IEEE 802.16

鄒政峰(Cheng-Feng Tsou)

指導教授 ： 呂虹慶

大同大學/電機資訊學院/電機工程學系所/碩士(2008年)

摘要

WiMAX，全名為Worldwide interoperability for Microwave Access，提供了一些方法讓使用者做頻寬傳送訊息。競爭和輪詢對SSs (Subscriber Stations)而言是其中兩種頻寬傳送的方法，使BS (Base Station) 知道哪些使用者需要更多或是不再需要頻寬，然而，這兩種方法並不適用於所有Quality of Services (QoS) 的需求，因為有些QoS對時間延遲較靈敏，有些對吞吐量反而較重視，BS可以在不同情況下對新註冊的SS給予決定使用哪種方法使系統有較好的效能。因此，在競爭和輪詢做比較的目的是在於讓BS有較好的頻寬傳送方法選擇。在相同的吞吐量和時間延遲的定義下，進行競爭和輪詢的比較。另一方面，模擬結果也顯示出在SS個數變多之後，輪詢的整體效能會比競爭好。

關鍵字

排程 ； 競爭 ； 輪詢

並列摘要

Worldwide interoperability for Microwave Access (WiMAX) provides some intelligent methods for users to make bandwidth requests. Contention and polling are both the schemes for SSs (Subscriber Stations) to have a chance to ask for more bandwidth from BS (Base Station). However, these two methods are not all suitable for all the Quality of Services (QoS) requirements in the SSs. Some service types are more sensitive in delay and some are not. BS can give a new registered SS a choice by comparing contention or polling in some kind of situations that can have better system performance. Therefore, the purpose for this comparison between contention and polling is trying to give BS a choice and one could get a better choice of making bandwidth request. Under the same QoS service type and the same definition of throughout and delay, the comparison between contention and polling is made. On the other hand, the simulation results also showed that polling would become much better than contention when the number of SS increase.

並列關鍵字

scheduling ； contention ； polling

參考文獻

[2] IEEE Std 802.16e-2005, “IEEE Standard for Local and Metropolitan Area Networks Part 16: Air Interface for Fixed and Mobile Broadband Wireless Access Systems.”

[3] S. Oh and J. Kim, “The Analysis of the Optimal Contention Period for Broadband Wireless Access Network”, Proceedings of the Third IEEE International Conference on Pervasive Computing and Communications Workshops, pp. 215-219, Mar. 2005.

[4] D. Cho, J. Song, M. Kim, and K. Han, “Performance Analysis of the IEEE 802.16 Wireless Metropolitan Area Network”, Proceedings of the First International Conference on Distributed Frameworks for Multimedia Applications, pp. 130-137, Feb. 2005.

[7] Q. Ni, A. Vinel, Y. Xiao, and J. Tao, “Investigation of Bandwidth Request Mechanisms under Point-to-Multipoint Mode of WiMAX Networks”, IEEE Communications Magazine, vol. 45, pp. 132-138, May 2007.

[1] IEEE Std 802.16-2004, “IEEE Standard for Local and Metropolitan Area Networks Part 16: Air Interface for Fixed Broadband Wireless Access Systems.”