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研究生:林咨銘
研究生(外文):Lin, Tzu-Ming
論文名稱:在無線中繼網路之效能改進研究
論文名稱(外文):Study on Performance Enhancement in Wireless Relay Networks
指導教授:陳文村陳文村引用關係曹孝櫟曹孝櫟引用關係
指導教授(外文):Chen, Wen-TsuenTsao, Shiao-Li
學位類別:博士
校院名稱:國立清華大學
系所名稱:通訊工程研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2014
畢業學年度:102
語文別:中文
論文頁數:119
中文關鍵詞:效能改善無線通訊無線中繼
外文關鍵詞:Performance EnhancementWireless CommunicationWireless Relay
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無線中繼網路是一種預期在未來可以用來提升通訊服務範圍以及增加傳輸效能的通訊技術。目前此種技術因為其具備系統性能提升之特性而被微波存取全球互通系統(WiMAX)與長期演進技術系統(LTE-A)所採用。藉由布建中繼節點(Relay Node),傳統基地台可以透過無線中繼鏈結達到資料轉傳的功效。此外,無線中繼傳輸技術也被考慮應用在高速移動的使用情境,如高速鐵路,利用車廂上所佈建的無線中繼節點,可以為車上使用者提供高速且連續的無線傳輸服務。相較傳統單一無線鏈結之傳輸,在多個無線鏈結傳送資料之中繼傳輸技術,存在著額外控制訊息以及傳送延遲的問題。此篇論文針對傳輸效率問題,提出一項高效能中繼轉傳技術,減少在中繼傳輸過程中所額外付出之控制代價;接著針對在多躍式傳送時為處理資料錯誤之控制訊息,提出區域性端對端ARQ控制及重傳技術。最後,處理在高速移動環境下之頻繁換手問題,本研究為移動式中繼網路設計一套具備快速預測以及縮短延遲之換手機制。藉由本研究所提出對於無線中繼網路之傳送及換手效能改善,可以達到精簡網路佈建以及營運成本之預期功效。
Wireless relay network is a low-cost solution for extending the service coverage and increasing the throughput of the conventional single-hop wireless network. Introducing RNs into the traditional wireless communication system has also been proven to be a viable way to expand system capacity and reduce Capital Expenditure (CAPEX) and Operational Expenditure (OPEX) [2]. Recently, relay technology has been adopted to enhance the coverage and performance of wireless networks such as WiMax and LTE-A. Mobile relay is also adopted as a special application of relay network to serve people in movement and considered to support communication services high speed mobile networks. By deploying a relay network, an enhanced node B (eNB) can provide services to user equipments (UEs) through relay links. For a mobile relay scenario, an RN establishes backhaul links with the serving donor eNB (DeNB), and coordinates control and data flows for UEs. Because the relay transmissions are conducted through multiple radio links, using relays to forward packets will induce new transmission and handover problems. This dissertation discusses the performance issues of fixed and mobile relays, especially on overhead and latency. First, conventional transmission schemes require an RN to store and process each packet before the destination is identified, and thus introduce extra processing and buffering overheads on the RN. In this dissertation, we propose a simple and efficient forwarding scheme which multiplexes bursts of packets for the UEs attached to the same access RN and switches packet bursts in an end-to-end manner to enhance the transmission efficiency. Second, it was observed that an improper ARQ strategy increases latency, blocked packets and workloads on a multi-hop relay network. To handle the ARQ problem, this dissertation proposes a new relay ARQ scheme providing efficient acknowledgement scheme to reduce transmission latency and also the number of blocked packets. In the mobile relay scenario, the relay network suffers from heavy signalling overhead since the vehicle moves in high speed, causing the mobile RN to change the serving DeNB frequently. Enhanced measurement and handover schemes are provided to solve the problems of message overhead and handover latency in the mobile relay systems. Furthermore, this dissertation also provides analytic models to evaluate the performance of the proposed schemes. Simulation results also validate the proposed analytic models and demonstrate that the proposed schemes can solve the addressed problems.
第一章 簡介
第二章 無線中繼網路背景及議題討論
第三章 中繼資料傳輸效能改進
第四章 移動式中繼網路換手效能改善
第五章 結語
英文附錄

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