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研究生:黃正揚
研究生(外文):Chen-YangHuang
論文名稱:正交分頻多工微型基地台網路中上行鏈路換手機制之研究
論文名稱(外文):On the Handover Scheme for the Uplink Transmissions in OFDMA Femtocell Network
指導教授:張志文張志文引用關係
指導教授(外文):Chih-Wen Chang
學位類別:碩士
校院名稱:國立成功大學
系所名稱:電腦與通信工程研究所
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:2012
畢業學年度:100
語文別:英文
論文頁數:52
中文關鍵詞:微型基地台換手機制共層級干擾問題跨層級干擾通道選擇功率分配
外文關鍵詞:Femtocellhandovercross-layer interferenceco-layer interferencechannel selectionpower allocation
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  • 被引用被引用:0
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  • 下載下載:32
  • 收藏至我的研究室書目清單書目收藏:0
在正交分頻工多工微型基地台網路中,與大型基地台之間的跨層級干擾和鄰近微型基地台共層級干擾往往會影響整體環境的表現。在上行鏈路中,當大型基地台用戶鄰近微型基地台時, 會對使用者造成極大的干擾,本文將大型基地台用戶換手到微型基地台以解決跨層級干擾之問題。我們把換手機制分成兩部分:通道選擇和功率分配。在通道選擇中,提出不同的考量方式:最大化容量和最小干擾量,並設計一兼俱此兩種方法優勢之混合方式。模擬結果顯示,混合方式選出通道可以達到最大的通道容量。在功率分配方面,我們討論兩種傳送功率的方法,一為貪婪方式, 二為平衡訊號 ––干擾 ––雜訊比值方式,結果顯示,平衡訊號干擾雜訊比值的方式可以較低功率來達到對雙方使用者均衡通道容量。整體而言,本文提出的方法將有助於提升換手機制處理跨層級與共層級干擾問題的表現。 本文最後針對此類問題與其解決方法提出若干深入的討論與可行之建議。
In the OFDMA femtocell network, the cross-layer interference between macrocell and femtocell and co-layer interference between neighboring femtocells can deteriorate the overall affect system performance. In uplink transmissions, when a macrocell user is close to the femtocell base station, it can cause severe interference. In this paper, we propose an algorithm that led the MUE to select a sub-channel in femtocell to eliminate the cross=layer and co-layer interference. We divide the handover procedure into two parts: subchannel selection and power allocation process. In the subchannel selection, we propose three selection schemes: The maximum capacity selection, minimum interference selection and hybrid SINR and interference selection. In the power allocation we discuss greedy power allocation and balanced SINRs allocation schemes. According to the simulation results, we observed that the hybrid selection scheme can achieve higher channel capacity. This observations reveals that the balanced SINRs allocation scheme can achieve balanced SINR among users using less transmission power. To sum up, the propose methods can improve overall system performance thanks to the handover mechanism by eliminiating the cross-layer interference and co-layer interference. Some suggestions for possible research topics in the future are provided in the end of the thesis.
Chinese Abstract i
English Abstract ii
Acknowledgements iii
Contents iv
List of Tables vi
List of Figures vii
Glossary of Symbols x
1 Introduction 1
1.1 Problem Formulation and Solution 1
1.2 Thesis Outline 2
2 Background and Literature Survey 3
2.1 Femtocell 3
2.1.1 Access control mechanisms 4
2.1.2 Interference Scenarios 5
2.2 Orthogonal Frequency-Division Multiple Access (OFDMA) 8
2.3 Literature Survey on Handovers in Femtocell Network 9
3 System Model and Problem Formulation 11
3.1 System Model 11
3.2 Subcarrier Selection for Handovers 16
3.2.1 Maximum Capacity Selection 16
3.2.2 Minimum Interference Selection 19
3.2.3 Hybrid SINR and Interference Selection 22
3.3 Power Allocation Schemes 25
3.3.1 Greedy Power Allocation 25
3.3.2 Balanced SINRs Allocation 26
4 Simulation Results 27
4.1 Simulation Setup 27
4.2 Performance Comparison with Greedy Power Allocation 30
4.2.1 Two Femtocell Base Stations 30
4.2.2 Comparison with Variable System Parameters 33
4.3 Performance Comparison with Balanced SINRs Allocation 36
4.3.1 Two Femtocell Base Stations 36
4.3.2 Comparison with Variable System Parameters 41
4.4 Performance Comparison between Greedy Power and Balanced SINRs Allocation 45
5 Conclusions and Future works 47
5.1 Conclusions 47
5.2 Future Research 48
Bibliography 49
Vita 52
[1] D. Lopez-Perez, A. Valcarce, G.D.L. Roche and J. Zhang, “OFDMA Femtocells:A Roadmap on Interference Avoidance, IEEE Commun. Mag., vol. 47, pp. 41–48,Sep. 2009.
[2] V. Chandrasekhar, J. G. Andrews and A. Gathererl, “Femtocell Networks: A Survey, IEEE Commun. Mag., vol. 46.
[3] V. Chandrasekhar and J. G. Andrews, “Uplink Capacity and Interference Avoidance for Two-Tier Femtocell Networks, IEEE Transactions on Wireless Communications, vol. 8, no. 7, pp. 3498–3509, Jul. 2009.
[4] G.D. L. Roche, A. Valcarce, D. Lopez-Perez and Zhang, “Access Control Mechanisms for Femtocells, IEEE Commun. Mag., vol. 48, pp. 33–39, 2010.
[5] A. Golaup, M. Mustaphaand L. B. Patanapongpibul, and V.Group, “Femtocell Access Control Strategy in UMTS and LTE, IEEE Commun. Mag., vol. 47, pp.117–123, Sep. 2009.
[6] N. Saquib, E. Hossain, L. B. Le and D. I. Kim, “Interference management in OFDMA femtocell networks: issues and approaches, IEEE Commun. Mag., vol. 19, pp. 86–95, Jun. 2012.
[7] W. Noh, “A Distributed Resource Control for Fairness in OFDMA Systems : English-Auction with Imperfect Information, in Global Telecommunications Conference, Nov. 2008, pp. 1–6.
[8] J. Gora, K. I. Pedersen, A. Szufarska, and S. Strzyz, “Cell-Specofic Uplink Power Control for Heterogeneous Networks in LTE, in IEEE Vehicular Technology Conference, Sep. 2010.
[9] I. Guvenc, M. Jeong, F. Watanabe, and H. Inamura, “A Hybrid Frequency Assignment for Femtocells and Coverage Area Analysis for Co-Channel Operation, IEEE Communications Letters, pp. 880–882, Dec. 2009.
[10] Y. Bai, J. Zhou, and L. Chen, “Hybrid Spectrum Usage for Overlating LTE Macrocell and Femtocell, in Global Telecommunications Conference, Dec. 2009, pp. 1–6.
[11] L. Yang, L. Zhang, T. Yang and W. Fang, “Location-based Hybrid Spectrum Allocation And Resue For Tiered LTE-A Networks, in Vehicular Technology Conference, May. 2011, pp. 1–5.
[12] M. Z. Chowdhury, W. Ryu, E. Rhee and Y. M. Jang, “Handover between Macrocell and Femtocell for UMTS based Networks, in Advanced Communication Technology., Feb. 2009, pp. 237–241.
[13] N. Nasser, A. Hasswa and H.Hassaneinl, “Handoffs in Fourth Generation heterogeneous networks, IEEE Commun. Mag., pp. 96–103, Oct. 2006.
[14] Z. Fan and Y. Sun, “Access and handover management for femtocell systems, in Vehicular Technology Conference., May 2010, pp. 1–5.
[15] H. A. Mahmoud, I. Guvenc and F. Watanabe, “Performance of Open Access Femtocell Networks with Different Cell-Selection Methods, in Vehicular Technology Conference, May 2010, pp. 1–5.
[16] I. Demirdogen, I. Guvenc and H. Arslan, “A Simulation Study of Performance Trade-offs in Open Access Femtocell Networks, in Personal, Indoor and Mobile Radio Communications Workshops, Sep. 2010, pp. 151–156.
[17] C. Ma, G. Yu and J. Zhang, “Inter-tier Handover in Macrocell/Relay/Femtocell Heterogeneous Networks, in Vehicular Technology Conference, May 2012.
[18] J. Moon and D Cho, “Efficient Handoff Algorithm for Inbound Mobility in Hierarchical Macro/Femto Cell Networks, IEEE Communications Letters, pp. 755–757, Oct. 2009.
[19] Y. Wang, K. I. Pedersen and F. Frederiksen, “Detection and Protection of Macro-Users in Dominance Area of Co-channel CSG Cells, in Vehicular Technology Conference, May 2012, pp. 1–5.
[20] L. C. Tseng, C. Y. Huang and A. F. Hanif, “Dynamic Resource Management for OFDMA-based Femtocells in the Uplink, in Wireless Communications and Mobile Computing Conference, Jul. 2011, pp. 528–533.
[21] H. Holma, A. Toskala, LTE for UMTS - OFDMA and SC-FDMA Based Radio Access, 1st ed.John Wiley & Sons, Ltd, 2009.
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