於中繼站增強的長期演進技術網路中以毫微微蜂巢式基地台輔助之資料傳送協定

為了創造一個無所不在的通訊世界，行動與無線網路通訊技術被廣為討論。長期演進技術網路是新一代行動無線寬頻技術。在長期演進技術網路中加入中繼站的增強架設，主要目的為延伸通訊範圍以及增加系統的負載容量。毫微微蜂巢式基地台是一個小型的家用基地台，使用環境在家庭、企業以及鄉村地帶。行動通訊裝置可以透過毫微微蜂巢式基地台的服務，利用數位用戶迴路或是現存的有線寬頻線路連線到行動業者的核心網路或是網際網路。當使用者在兩個基地台或是基地台下的中繼站之間執行換手程序的時候，使用者和遠方連線的對應裝置會因為換手期間造成資料傳輸的中斷。在傳統的通訊協定下，並沒有考慮到使用者在換手執行期間，過長的資料中斷時間造成系統傳輸效率的低落。當基地台的資源被過多的使用者爭奪的時候，封包的遺失量也會隨之升高。因此本論文提出一個通訊協定，在使用者執行換手程序的期間，透過毫微微蜂巢式基地台的協助，使用者可以將遠方連線裝置的大部分暫存資料提前接收給使用者，去縮短接收全部資料的處理時間。根據本論文提出的通訊協定，接收大部分的暫存資料可以縮短在換手完成之後接收全部資料的處理時間。因為縮短了接收資料的時間，資料傳輸的吞吐量將會提高，資料傳輸的效率因此能獲得提升並加以改進。系統模擬的實驗結果，可以證明本論文提出的通訊協定確實能夠有效率地提升於中繼站增強的長期演進技術網路的資料傳輸效率。

關鍵字

長期演進技術；換手；中繼站；毫微微蜂巢式基地台；資料傳送

並列摘要

For providing a ubiquitous world, mobile and wireless communication technologies are dis-cussed. Long Term Evolution (LTE) is a radio technology which provides an all-IP .at network-ing architecture. Relaying is expected to increase the coverage and capacity of LTE networks. Femtocell is a small cellular base station designed for using in the residential, the enterprise, and the rural, etc. Femtocells serve mobile devices to connect to a mobile operator network using digital subscriber line (DSL) or cable broadband connections. A user equipment (UE) starts handover between two evolved Node B (eNB), between relay nodes and eNBs, or between two relay nodes. During the handover procedure of the data forwarding, the UE stops the data transmission with the corresponding node (CN) to handover to another eNB or relay node (RN). In the conventional protocol in the relay enhanced LTE networks, the protocol does not consider the long disconnecting time of the data forwarding in the handover procedure. The packet loss occurs when the resource of the eNB has been occupied by many users in the serving area. This thesis proposes a protocol to reduce the processing time of the buffered data forwarding in the handover procedure. When the UE starts handover from the source eNB to the target eNB, the UE disconnects for a long time. The UE does not receive the data from the CN soon. In the proposed protocol, femtocells assist the UE to download buffered data quickly. Because the UE receives the buffered data quickly, the throughput is better than the conventional protocol. The proposed protocol also reduces packet loss rate because the femtocells assist the capacity of the eNB. By the simulation results, the proposed protocol enhances the performance of the data transmission ef.ciently in the LTE networks.

並列關鍵字

LTE ； handover ； relay ； femtocell ； data forwarding

參考文獻

[6] D. Calin, H. Claussen, and H. Uzunalioglu, “On femto deployment architectures and macrocell offloading benefits in joint macro-femto deployments,” IEEE Communications Magazine, vol. 48, no. 1, pp. 26–32, 2010.

[8] R. Y. Kim, J. S. Kwak, and K. Etemad, “WiMAX femtocell: requirements, challenges, and solutions,” IEEE Communications Magazine, vol. 47, no. 9, pp. 84–91, 2009.

[9] A. Golaup, M. Mustapha, and L. B. Patanapongpibul, “Femtocell access control strategy in UMTS and LTE,” IEEE Communications Magazine, vol. 47, no. 9, pp. 117–123, 2009.

[11] “The Femto Forum.” [Online]. Available: http://www.femtoforum.org

[13] “The picoChip.” [Online]. Available: http://www.picochip.com

國際替代計量

於中繼站增強的長期演進技術網路中以毫微微蜂巢式基地台輔助之資料傳送協定

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