Fast Data Access and Energy-Efficient Data Broadcast Protocol for Advanced Wireless Network

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基本資料

Project title

Code/計畫編號

NSC100-2221-E019-044

Translated Name/計畫中文名

支援前瞻無線網路資訊快速存取及節能之廣播協定設計

Project Coordinator/計畫主持人

Haw-Yun Shin

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Department of Computer Science and Engineering

Website

https://www.grb.gov.tw/search/planDetail?id=2349503

Year

2011

Start date/計畫起

01-08-2011

Expected Completion/計畫迄

31-07-2012

Bugetid/研究經費

531千元

ResearchField/研究領域

資訊工程--硬體工程

前瞻無線網路有更高的頻譜使用效益，對於數量遽增的使用者，可提供更高的頻寬及多樣性的服務。在有限的無線頻寬資源中，為了減少行動裝置（Mobile Devices）對經常使用的資訊重覆向系統提出存取要求，以避免資訊在無線網路下載通道中重複傳送，資料廣播（Data broadcasting）是一種很有效率的資訊傳遞方法，可以讓所有行動裝置同時由一個下載通道接收資訊。節能(Power Saving)在無線網路環境中是重要議題，每個行動裝置配備有限電力的電池，適當的電源管理策略是延長電源使用時間的最重要方式之一。在無線資訊廣播系統中有二個重要參數用以評估該系統的效能：調諧時間（Tuning time）及讀取時間（Access time）。調諧時間經常用來評估廣播系統其行動裝置省電的效能，而讀取時間則用以評估廣播系統的反應時間。本計畫提出風車演算法，此演算法可將廣播訊息依其受歡迎度在廣播通道中做最對稱的排列，可以有效降低行動裝置讀取廣播資訊的平均讀取時間。同時本計畫將風車演算法實現於所設計之兼具節能及快速訊息讀取之通訊協定中，只需將極少的額外資訊置於每一個廣播資訊的前端，引導行動裝置何時應進入節能模式、何時應回到動作模式讀取廣播資訊，再依本計畫提出之廣播資訊搜尋法則，可以加速行動裝置的讀取所需訊息的時間及降低耗電。 WiMAX 及LTE 的架構已訂定有完整的資訊群播能力，為實現本計畫所提出之風車演算法、節能通訊協定及廣播資訊搜尋法則，本計畫將於WiMAX 及LTE 系統建構兼具服務品質之廣播節能通訊協定，於系統端實現風車排程演算法，並於行動裝置端實現廣播資訊搜尋法則，其中也將提出如何正確評估廣播資訊之受歡迎度。 Advanced wireless networks provide users with a great diversity of services and a wide bandwidth. Data broadcasting has emerged as an efficient means for the dissemination of information over asymmetry wireless networks. To avoid multiple retransmissions and to decrease the number of requests from mobile devices (MDs), frequently requested messages are periodically broadcasted on the downlink channels by a base station (BS), and MDs in its cell tune into these channels to extract the desired messages. Energy saving is an important issue in the wireless environment. The performance of broadcast systems is often characterized by two metrics: access time and tuning time. Access time refers to how fast the MD can access the requested data. It reflects the responsiveness of the system. Tuning time, on the other hand, refers to the duration for which the MD stays active. It measures the energy consumed by the MD in the active mode. A good broadcast system should achieve both low access time and low tuning time. In this proposal, we propose a broadcasting channel allocation schemes and admission control strategy for wireless network systems in supporting QoS for various multimedia services. We propose a multichannel broadcast paradigm that constructs the broadcast channels according to the access frequency of each type of message in order to save energy in mobile devices. The pinwheel scheduling algorithm (PSA) presented in this proposal is used to organize all types of messages in the broadcast channels in the most symmetrical distribution in order to reduce both the tuning and access time. A complete message multicast mechanism has planed in Both WMAX and LTE system. To implement the proposed PSA algorithm, power saving protocol and the broadcasted message searching strategy, this proposal accomplishes a broadcast protocol which provides both QoS and power saving in both WiMAX and LTE systems. The power saving protocol is executed in system side and the message searching strategy is preformed in mobile device side. The methods how to estimate the popularities of each message are also discussed in this proposal.

Keyword(s)

LTE
WiMAX
節能
廣播系統
調諧時間
讀取時間
power conservation
broadcast system
tuning time
access time

DSpace CRIS

Fast Data Access and Energy-Efficient Data Broadcast Protocol for Advanced Wireless Network

基本資料

Description