WiMax 網路上鏈訊務之無線電資源管理及睡眠節能模式之研究 ; The study of radio resource management and power-saving for uplink traffic in WiMax network

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Title:	WiMax 網路上鏈訊務之無線電資源管理及睡眠節能模式之研究;The study of radio resource management and power-saving for uplink traffic in WiMax network
Authors:	朱衍印;Yen-Yin Chu
Contributors:	通訊工程研究所
Keywords:	WiMax;排程;頻寬需求;睡眠模式;sleep mode;bandwidth request;Scheduling;WiMax
Date:	2010-07-27
Issue Date:	2010-12-09 13:46:56 (UTC+8)
Publisher:	國立中央大學
Abstract:	近十幾年來，寬頻無線網路發展是為了讓使用者能夠無所不在的使用寬頻網路的服務，為了達到能夠隨時隨地使用寬頻網路，行動裝置的電量消耗也是一個重要的問題。本論文提出一個在上行鏈路方向的排程方法，不僅考慮到不同服務類型的服務品質要求，並且把電力消耗的問題也一併考慮。在上行鏈路方向(uplink)與下行鏈路(downlink)不同的地方在於uplink在BS分配頻寬的時候並不是即時性的了解MS目前的需求資訊，造成在封包排程的機制設計上的困難。MS會先提出頻寬需求給BS，而BS會根據目前所擁有的頻寬分配給每條連線，並在UL-MAP分配頻寬給每個MS。因此，本論文在WiMax網路的環境下，將rtPS和nrtPS這兩種不同的服務類型設計不同的排程方式和睡眠模式，並且在模擬時與目前WiMax標準所制訂的方法做比較，本論文所提出的方法在不同的網路流量的情形下能達到比較好的睡眠效率同時也能夠滿足服務品質的要求。In recent years, broadband wireless access (BWA) networks have been rapidly evolved to satisfy the increasing demands of users for ubiquitous and seamless access to various kinds of services. In order to achieve anytime, anywhere, and longer non-stop access to broadband networks through mobile devices with limited power, the power saving is a critical issue toward this objective. Based on the basic sleeping mode concept, this thesis proposes a power saving centric scheduling scheme for uplink traffic while taking the quality of service (QoS) as a constraint requirements. The uplink resource allocation is quite different from that of the downlink resource allocation scheme, because the uplink traffic is queued at the mobile stations (MS) side and base station (BS) has no information about it and cannot allocate radio resource properly. MS will raise bandwidth request (BR) to BS, the BS according to radio resource to allocate bandwidth to each connection after receive BR, and bandwidth allocation in the UL-MAP to each MS. In this thesis both of the rtPS and nrtPS service types are studies. These two service types have different QoS requirement and, therefore, have different design in their sleeping arrangement and scheduling policy. The simulation results are compared with the standard sleeping approach of the WiMax network. The simulation results show that the proposed scheme achieves better sleep efficiency than the standard scheme and can also satisfy the QoS requirements.
Appears in Collections:	[Graduate Institute of Communication Engineering] Electronic Thesis & Dissertation

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