在LTE-A環境下對於協調式多點傳輸 的使用者資源區塊配置及分群機制

An UE–Specific Resource Allocation Scheme with Cell Clustering for CoMP Transmission in LTE-A

林亞璇(Ya-Hsuan Lin)

指導教授 ： 黃啟富

國立中正大學/工學院/資訊工程學系/碩士(2013年)

摘要

在LTE-A中，協調式多點傳輸(CoMP)被視為是一項具有前瞻性的技術，目的是用來改善細胞邊緣使用者的效能以及系統整體效能。為了能運行CoMP這項技術，去選擇出適合的合作細胞分群是非常重要的。而在我們的研究裡運用了以使用者為取向的細胞分群方法，也改善了資源分配機制，使得細胞邊緣的效能得到提升。對細胞邊緣使用者來說，他們會自行去選擇最適合的合作傳輸分群。換句話說，使用者擁有選擇兩個或三個細胞去形成候選分群的決定權。此外現有的研究大多數都著重於在不同的分群機制下對效能的提升，本篇文章則是著重於在運行CoMP的環境下，不同的資源分配方法會對效能產生的影響。為了增強信號強度以及減少細胞內的干擾，我們讓同一組分群中的所有基地台傳送同一格資源區塊給細胞邊緣使用者。我們也證明了在同時考慮細胞分群及資源分配的機制下，我們的問題會是一個NP-Hard的問題。經過模擬的結果，用我們的方法去和SCM[2]以及沒有使用CoMP的方法做比較，在細胞邊緣使用者的效能得到了提升。另外，我們也提升了細胞邊緣使用者得到資源區塊進而能做CoMP合作傳輸的機會。

關鍵字

分群 ； CoMP ； LTE-A ； 資源分配

並列摘要

CoMP-JP (Coordinated Multi-Point Joint Processing) is regarded as a promising technique to improve cell edge user throughput as well as overall throughput in LTE-A downlink. Choosing the proper cooperating cells for CoMP transmission is especially critical. In this work, we use UE-specific cell clustering and improve resource allocation scheme to enhance edge performance. From the view point of cell edge users, they would choose their proper candidate CoMP clusters. In other words, user owns the decision of forming a cluster by choosing two or three eNBs. Besides, while most existing works focus on only how many throughput advancements that different clustering schemes can achieve. This paper concern about the effect of different resource allocation in CoMP transmission. That is, we let clusters to transmit the same resource blocks to enhance the signal strength and reduce intra cell interferences. By take both clustering and resource allocation into consideration, we formally define and prove this problem is NP-Hard. Through simulation studies, we show the proposed scheme can achieve throughput gain of edge users by comparing with static clustering [2] and non-CoMP scheme. In addition, we also improve the opportunities of cell edge user to obtain resource blocks to form CoMP clusters.

並列關鍵字

clustering ； CoMP ； LTE-A ； resource allocation

參考文獻

[1] L. Daewon, S. Hanbyul, B. Clerckx, E. Hardouin, D. Mazzarese, S. Nagata, and K. Sayana, "Coordinated multipoint transmission and reception in LTE-advanced: Deployment scenarios and operational challenges," IEEE Commun. Mag., vol. 50, pp. 148-155, Feb. 2012.

[2] P. Marsch and G. Fettweis, “Static clustering for cooperative multipoint (CoMP) in mobile communications,” IEEE International Conference on Communications, 2011, pp. 1 – 6, June 2011.

[3] R. Weber, A. Garavaglia, M. Schulist, S. Brueck, and A. Dekorsy, “Self-organizing adaptive clustering for cooperative multipoint transmission,” in Proc. IEEE Veh. Technol. Conf. (VTC Spring), Budapest (Hungary), May 2011.

[4] Xiaofeng Tao, Xiaodong Xu, Qimei Cui, "An overview of cooperative communications," IEEE Commun. Mag., vol.50, no.6, pp.65- 71, June 2012

[5] Yu-Ngok Ruyue Li, Jian Li, Weimin Li, Yan Xue, and Huaming Wu, “An Effective Scheduling Scheme for CoMP in Heterogeneous Scenario,” IEEE Globecom Workshops, 2012.