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    政大機構典藏 > 理學院 > 資訊科學系 > 學位論文 >  Item 140.119/58698
    Please use this identifier to cite or link to this item: http://nccur.lib.nccu.edu.tw/handle/140.119/58698

    Title: 優化LTE-A中繼網路中使用頻率重用的資源分配
    Optimal Resource Allocation for Frequency Reuse in LTE-A Relay Networks
    Authors: 王鐘毅
    Wang, Chung Yi
    Contributors: 張宏慶
    Jang, Hung Chin
    Wang, Chung Yi
    Keywords: 中繼站
    relay network
    frequency reuse
    dynamic resource allocation
    inter cell interference coordination
    Date: 2012
    Issue Date: 2013-07-01 17:33:56 (UTC+8)
    Abstract: LTE-A系統考慮了中繼站(Relay Station,RS)的配置,當RS的引入在改變網路架構的同時,也使得系統的無線電資源需要重新分配,以提高資源的利用率。然而,在加入RS後的系統,細胞間干擾(inter-cell interference)的問題仍是影響傳輸品質與系統容量的因素,尤其是在細胞邊緣(cell edge)的用戶更是明顯。雖然使用頻率重用可以增加整個系統頻譜利用率,但過多的頻率重用會增加系統結構的複雜度及增加干擾,反而影響訊號傳輸品質。
    本論文針對在不同基站(Base Station,BS)所屬的系統下使用RS,探討對其所服務的cell邊緣與鄰近cell邊緣之間容易發生共用子通道(co-channel)的問題。本論文提出IFR (Improved Soft Frequency Reuse)方法,對cell內所有的RS在資源配置的順序排程上做調整,分別為cell中心區與cell邊緣區設計不同的演算法。並將cell規劃成三個sector分別配置所屬的RS,採用動態干擾協調以達到最有效率的資源配置,將干擾值降低以提高訊號雜訊比(Signal to Interference plus Noise Ratio,SINR),來達到提升cell邊緣及整體系統吞吐量(Throughput)的目的。
    Considering the relay station (Relay Station, RS) configuration, LTE-A system is presented to the public. The introduction of the RS changes the network architecture. At the same time, it makes the system re-allocating radio resources in order to improve resource utilization. However, after adding RS, problems of interference between cells still affect the transmission quality and system capacity, especially for those users of cell edge. Although the frequency reuse can increase spectral efficiency of the system, too much of this will increase the system complexity of the structure and increase interference. That will affect the signal transmission quality.
    This thesis proposes the IFR (Improved Soft Frequency Reuse) method. It improves co-channel Interference problem of using RS systems between the cell edge and adjacent cell edge. IFR adjusts allocations of all RS resources and designs different algorithms for cell edge and cell central region. We divide the cell into three sectors and arrange two RSs into one sector. We use dynamic interference coordination to achieve the most efficient allocation of resources.
    And then it reduces the interference to improve the SINR (Signal to Interference plus Noise Ratio) and system throughput.
    Reference: [1] 3GPP TS 36.211 v.8.4.0 Physical Channels and Modulation(Release 8)。
    [2] 3GPP TS 36.212;Multiplexing and Channel Coding(Release 8)。
    [3] 3GPP TS 36.213;Physical Layer Procedures(Release 8)。
    [4] 3GPP TR 25.892;Feasibility Study for Orthogonal Frequency。
    [5] Siemens, “Interference mitigation by partial frequency reuse”, 3GPP TSG-RAN WG1 Meeting #44, R1-060670,February 2006.
    [6] X. Mao, A. Maaref, and K. H. Teo, “Adaptive soft frequency reuse for inter-cell interference coordination in SC-FDMA based 3GPP LTE uplinks,” in Proceedings of the IEEE Global Telecommunications Conference (GLOBECOM ’08), pp. 4782–4787, December 2008.
    [7] Xunyong Zhang, Chen He, Lingge Jiang, Jing Xu, “Inter-cell interference coordination based on softer frequency reuse in OFDMA cellular systems”, IEEE Int. Conference Neural Networks & Signal Processing, pp.270-275, 8~10 June, 2008.
    [8] W. H. Park and S.Bahk,“Resource management policies for fixed relays in cellular networks”,in Proc. IEEE GLOBECOM 2006, December 2006, San Francisco, California.
    [9] P. Li, “Spectrum partitioning and relay positioning for cellular system enhanced with two-hop fixed relay nodes,” IEICE Trans. Comm., E90-B (Nov. 2007)
    [10] J. Lee, S. Park, H. Wang et al.“QoS-guaranteed transmission scheme selection for OFDMA multi-hop cellular networks,” in Proc. IEEE ICC 2007, June 2007, Glasgow, Scotland, pp. 4587-4591。
    [11] L.Wang, Y. Ji, F.Liu,and J.Li, ”Performance improvement through relay-channel partitioning and reuse in OFDMA multihop cellular networks,” in IEEE Wireless Communications and Mobile Computing Conference, 2008, pp. 177–182.
    [12] W. Ajib, D. Haccoun,“An overview of scheduling algorithms in MIMO-based fourth-generation wireless systems, “ IEEE Transactions on Networking, Volume 19, Issue 5, Sept-Oct. 2005 Page(s); 43-48.
    [13] J. M. Holtzman, “Asymptotic analysis of proportional fair algorithm, “IEEE personal, indoor and mobile radio communications, Vol. 2,pp: F-33-F-37,30 Sept,-3 Oct.,2001.
    [14] Khedr M,. El-Rube I, Hanafy Y, Abou-zeid H, ”Subcarrier opportunistic proportional fair scheduling for OFDMA systems”, Internet, 2008. ICI 2008. 4th IEEE/IFIP, 23-25 Sept. 2008
    [15] A. Ghosh, R. Ratasuk, B. Mondal, N. Mangalvedhe and T. Thomas, MOTOROLA INC., “LTE-advanced:next-generation wireless broadband technology,” IEEE Wireless Communication, vol.17, no. 3, June 2010.
    Description: 碩士
    Source URI: http://thesis.lib.nccu.edu.tw/record/#G0098753020
    Data Type: thesis
    Appears in Collections:[資訊科學系] 學位論文

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