應用於IEEE 802.16j都會型網路下具QoS之可調適頻寬排程機制

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Title:	應用於IEEE 802.16j都會型網路下具QoS之可調適頻寬排程機制
Other Titles:	A Qos-Based Adaptive Bandwidth Scheduling Mechanism for Ieee 802.16j Networks
Authors:	王英宏
Contributors:	淡江大學資訊工程學系
Keywords:	IEEE802;16j;服務品質保證;中繼站;排程;頻寬資源管理;IEEE802;16j;QoS;Relay Station;Scheduling;Bandwidth Resource Management
Date:	2012-08
Issue Date:	2015-05-19 15:36:29 (UTC+8)
Abstract:	在IEEE 802.16 的標準制定中，除了支援使用者以無線存取方式上網之外，對於處在移動狀態中的用戶，亦提供高傳輸速率及高穩定度的服務品質(Quality of Service, QoS)。故無線網路系統中的資源配置較有線網路中來的複雜，且無線網路系統中的排程器(Scheduler)在設計上也比有線網路中要困難上許多。原因在於無線網路的環境中，無線電資源管理必須將有限的網路資源做適當的分配，並且要考慮到無線電干擾之下的通道狀態資訊變化情形，在通訊環境經常發生變化的情況之下，排程器必須做出適合的排程方式來給予所有使用者應有的服務品質保證，並且發揮系統的最大效能。而IEEE 802.16j 標準之目的在強化以IEEE 802.16 標準為基礎之無線寬頻網路系統效能，並藉由新型中繼台(Relay Station, RS)的開發以協助降低整體系統之佈建成本，並增加系統佈放的彈性。目前IEEE 802.16j 標準的制定，並未制定排程器的運作方式？因此，IEEE802.16j 標準之排程器仍是一個開放的研究議題，是以本研究擬設計一個適用於IEEE 802.16j 排程器的演算法，期望能達到服務品質的保證與最好的頻寬使用效能。為了達成上述目標，本計畫擬提出一個『應用於IEEE 802.16j 都會型網路下具QoS 之可調適頻寬排程機制』(A QoS-based Adaptive Bandwidth Scheduling Mechanism for IEEE 802.16j Networks)的二年期研究計畫，第一年之研究目標為可以調節無線電頻寬資源之『應用於IEEE 802.16j 都會型網路下之可調適頻寬排程機制』之研究，以達成可以充分有效分配與管理無線電頻寬的排程機制。之後再以已達成的可調適頻寬排程基礎下，進行可以有效確保QoS 需求之『應用於IEEE 802.16j 都會型網路下具QoS 之複合頻寬排程機制』，進而達成本研究計劃之整體研究目標與目的。本研究計畫所提出之研究方法將透過模擬實驗與相關既有的研究技術進行分析比較，期以論政本研究計畫所提方法之有效性與優越性，並能提供相關產業之技術開發與利用。 In the target of IEEE 802.16 standard, it enables users to access Internet by wireless and provides the fine QoS with high transmission rate and high stability to mobile users. Therefore, it is more complex to handle the frequency allocation from wireless network systems than wired systems. The design of scheduler for wireless networks is also more difficult. The reason is the radio frequency management should make more precise distribution to the limited bandwidth resources in wireless networks. Moreover, due to the radio frequency is easy to be interfered and the quality of radio channel is frequently changed, the scheduler need s to make a suitable bandwidth arrangement for all communication requirements. The scheduler must provide the necessary QoS to all subscribers and the best system performance. The purpose of IEEE 802.16j standard tries to enhance the performance of IEEE 802.16. It includes a new role of wireless networks, Relay Station (RS) to decrease the whole costs of system build-up. It is also to increase the flexibility of network topologies. However, the operation mechanism of scheduler still is an open issue in IEEE 802.16j. Therefore, the main purpose of this proposal is to design a fine scheme of IEEE 802.16j scheduler. It expects the proposed mechanism of the scheduler will provide a good QoS to all active subscribers and a nice performance in radio frequency bandwidth. To accomplish this purpose, the topic of this proposal is “A QoS-based Adaptive Bandwidth Scheduling Mechanism for IEEE 802.16j Networks”. We will spend two years to realize the design of proposed mechanism gradually. In the first year, the research and design target will focus on the scheduling scheme for the adaptive distribution and management of the radio frequency bandwidths. The sub-topic of first year is “An Adaptive Bandwidth Scheduling Scheme for IEEE 802.16j Networks”. Based on the results of an adaptive bandwidth scheduler in first year, we will keep continuously to research and design a QoS guarantied scheduling mechanism in second year. The sub-topic of second year is “A Hybrid QoS Guarantied Scheduling Mechanism for IEEE 802.16j Networks”. Both the researches and designs in two years, this proposal will apply some simulation experiences and comparison analysis to prove the advantages and efficiency of the proposed algorithms and schemes. We expect the proposed mechanisms can provide the improved techniques to the industries of mobile communications and wireless networks.
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