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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 謝宏昀(Hung-Yun Hsieh) | |
| dc.contributor.author | Chun-Yuan Yang | en |
| dc.contributor.author | 楊淳淵 | zh_TW |
| dc.date.accessioned | 2021-06-13T05:44:00Z | - |
| dc.date.available | 2012-08-22 | |
| dc.date.copyright | 2011-08-22 | |
| dc.date.issued | 2011 | |
| dc.date.submitted | 2011-08-19 | |
| dc.identifier.citation | [1] 3GPP TR 36.814 V9.0.0, “Further Advancements for E-UTRAN: Physical Layer
Aspects,” March 2010. [2] 3GPP TR 36.912 V9.2.0, “Feasiblity Study for Further Advancements for EUTRAN,” March 2010. [3] N. S. Networks, “CoMP Performance Evaluation,” no. R1-101431, 2010. [4] CMCC, “Performance Evaluation for DL Intra-eNB CoMP,” no. R1-101386, 2010. [5] N. DoCoMo, “Evaluation Scenarios and Assumptions for Intra-eNB CoMP,” no. R1-100820, 2010. [6] R. Zhang, “Cooperative Multi-Cell Block Diagonalization with Per-Base-Station Power Constraints,” IEEE Journal on Selected Areas in Communications, vol. 28, pp. 1435 –1445, december 2010. [7] S. Peters and R. Heath, “Cooperative Algorithms for MIMO Interference Channels,” IEEE Transactions on Vehicular Technology, vol. 60, pp. 206 –218, jan. 2011. [8] C. Ng and H. Huang, “Linear Precoding in Cooperative MIMO Cellular Networks with Limited Coordination Clusters,” IEEE Journal on Selected Areas in Communications, vol. 28, pp. 1446 –1454, december 2010. [9] J. Zhang and J. Andrews, “Adaptive Spatial Intercell Interference Cancellation in Multicell Wireless Networks,” IEEE Journal on Selected Areas in Communications, vol. 28, pp. 1455 –1468, december 2010. [10] K. Son, S. Chong, and G. Veciana, “Dynamic Association for Load Balancing and Interference Avoidance in Multi-Cell Networks,” IEEE Transactions on Wireless Communications, vol. 8, pp. 3566 –3576, july 2009. [11] W. Choi and J. Andrews, “The Capacity Gain from Intercell Scheduling in Multiantenna Systems,” IEEE Transactions on Wireless Communications, vol. 7, pp. 714 –725, february 2008. [12] S. Brueck, L. Zhao, J. Giese, and M. Amin, “Centralized Scheduling for Joint Transmission Coordinated Multi-Point in LTE-Advanced,” in 2010 International ITG Workshop on Smart Antennas (WSA), pp. 177 –184, feb. 2010. [13] Ericsson, “Performance Evaluation of Intra-site DL CoMP,” no. R1-101646, 2010. [14] Huawei, “Evaluation of DL CoMP for High Load and Low Load Scenarios,” no. R1-101069, 2010. [15] Huawei, “Performance Evaluation of CBF,” no. R1-101068, 2010. [16] L. Electronics, “System Level Performance with CoMP CB,” no. R1-101354, 2010. [17] L. Electronics, “System Level Performance with CoMP JP,” no. R1-101355, 2010. [18] Motorola, “CoMP Support in Rel-10: Performance with Intra-eNB CoBF and Cell-edge Improvements,” no. R1-101130, 2010. [19] Q. Europe, “UE-RS Pattern for LTE-A,” no. R1-093105, 2009. [20] Huawei, “DMRS Considerations for MU MIMO,” no. R1-101060, 2010. [21] N. DoCoMo, “DL DM-RS Design for LTE-Advanced,” no. R1-093503, 2009. [22] Ericsson and ST-Ericsson, “DM-RS Design for Rank 5-8,” no. R1-100046, 2010. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/33629 | - |
| dc.description.abstract | 多點協調傳輸與接收技術(CoMP)是 LTE-Advanced 系統中一項能提升位於 服務邊界使用者的服務品質以增進整體系統效能的技術。雖然理論上該技術能增 加使用者接收信號的品質,然而在實際系統中,多個基地台在共同傳輸前互相做 協調溝通的成本,往往會對系統造成額外的負擔,因而使效能上的增益不如預期。 為了瞭解 CoMP 在現今系統的可行性,並找出其適用情境,我們藉由最佳化工具 的幫助來衡量 CoMP 能為整個網路帶來的最大效益。目標函數的部份,除了一般 傳統在做網路最佳化常考慮到的系統容量之外,我們也從使用者的角度出發,提 出以整個網路裡頭能服務到的使用者個數作為衡量 CoMP 效能的另一個依據。我 們先考慮基本的模型,再將實作 CoMP 會遭遇到的額外負擔考量進來;此外,我 們也利用將限制式做線性轉換以及將目標函數利用分段式線性函數近似這兩個方 法來簡化解決問題的計算複雜度。實驗結果顯示,在最大化系統容量的目標下, 不考慮做 CoMP 的額外負擔時,CoMP 能提升 50% 左右的系統容量;然而,在 將額外負擔納入考量的情況下,使用 CoMP 幾乎沒有增益存在。另一方面,在最 大化系統服務使用者個數的目標下,使用 CoMP 可以使額外 12% 的使用者被服 務到,而且即便是在最嚴重的額外負擔設定下,CoMP 仍然能夠有 6% 左右的增 益;在更進一步的觀察基地台與使用者的服務情形後,我們發現在特定的通道容 量服務品質保障下,使用者會偏好由多個信號強度相當的基地台共同服務,而不 會選擇只給自己原本所屬的基地台做一對一服務。經由我們的分析發現即便 CoMP 的額外負擔對系統容量的增益影響甚巨,但在服務使用者的個數上仍能有 所提升;換句話說,在最佳的基地台與使用者服務分配下,CoMP 可以有效地提 升使用者被服務到的機率。 | zh_TW |
| dc.description.abstract | Coordinated multiple point transmission, referred to CoMP, is one of the new features in LTE-Advanced specification and a promising technique to improve both the throughput of UEs at cell edge and overall system performance. However, coordinations among base stations incur overheads in CoMP utilization which varies depending on how many and which transmission points are involved. In this thesis, we investigate the optimal transmission points allocation problem in CoMP with the aid of the network optimization tools. To enhance UEs' service probability, we consider the goal of maximizing the number of served UEs with satisfied QoS requirement in addition to the conventional approach which aims at maximization of the network sum capacity. We first model the basic form of those problems, and then introduce linearization transformation for constraints and linear approximation for the objective to reduce complexity. Finally we model additional overheads in CoMP as utilization penalty into our formulations. Evaluations show that CoMP can bring 12% more served UEs and 50% more sum capacity for those UEs suffered from severe interference. Moreover, we observe that for certain QoS requirements, UEs should ideally be served by multiple transmission points with comparable signal strengths rather than by its serving base station with full power consumption. Our results also reveal that typically a UE will be served by at most two transmission points in situations where CoMP obtains performance gain over single cell transmission. When signaling overhead is considered, the performance of CoMP based on sum capacity maximization degrades to that of the single cell transmission scheme, where no UE chooses to be served through CoMP scheme. CoMP based on UE number maximization, on the other hand, can still achieve a 6% gain even under the highest overheads. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-13T05:44:00Z (GMT). No. of bitstreams: 1 ntu-100-R98942065-1.pdf: 2866330 bytes, checksum: b874c0a8dbf7e6069c97175edca3eb29 (MD5) Previous issue date: 2011 | en |
| dc.description.tableofcontents | ABSTRACT ii
LIST OF TABLES v LIST OF FIGURES vi Chapter 1 INTRODUCTION 1 Chapter 2 COORDINATED MULTI-POINT TRANSMISSION 3 2.1 Overview of CoMP 3 2.2 Current Agreement on CoMP Evaluation 4 2.3 Related Work and Motivation 5 Chapter 3 FORMULATION FOR TRANSMISSION POINT SELECTION IN COMP 7 3.1 Maximization in Number of Served UEs 8 3.1.1 Linearization of Constraints 11 3.2 Maximization in Network Sum Capacity 14 3.2.1 Linearization for The Objective Function 16 Chapter 4 EVALUATION RESULTS 21 4.1 Result of Maximization in Number of UEs 21 4.1.1 Simulation of Specific Topology 21 4.1.2 Simulation of Random UE Location 29 4.2 Result of Maximization in Network Sum Capacity 32 4.2.1 Simulation of Specific Topology 32 4.2.2 Simulation of Random UE Location 36 4.3 Comparison between Objective Functions 42 4.4 Complexity Reduction through Linearization 46 4.5 Summary 47 Chapter 5 REFERENCE SIGNAL OVERHEAD IN COMP 49 5.1 Reference Signal 49 5.2 Additional Overhead in CoMP Joint Transmission 50 5.3 Adaptive Reference Signal Overhead Reduction Framework 53 5.3.1 Adaptive DM-RS Transmission Scheme 53 5.3.2 Restriction on DM-RS Transmission Layer 55 5.3.3 Transmission Point Selection with Overhead Consideration 56 5.4 Additional Requirement in Specification 56 5.4.1 DM-RS Transmission Pattern 56 5.4.2 DM-RS Indicator 59 5.5 Proof of Concept Simulation 59 Chapter 6 FORMULATION UNDER REFERENCE SIGNAL OVERHEADS 62 6.1 Maximization in The Number of Served UEs 62 6.2 Maximization in Network Sum Capacity 66 6.3 Formulation with Channel Estimation Overhead 69 Chapter 7 IMPACT OF COMP OVERHEADS 73 7.1 Result of Maximization in Number of UEs 73 7.1.1 Specific Topology 73 7.1.2 Random UEs' Location at Cell Edge 75 7.2 Result of Maximization in Network Capacity 79 7.2.1 Specific Topology 79 7.2.2 Random UEs' Location at Cell Edge 82 7.3 Summary 85 Chapter 8 CONCLUSION AND FUTURE WORK 86 Appendix A - HEURISTIC TRANSMISSION POINT SELECTION ALGORITHM 88 REFERENCES 90 | |
| dc.language.iso | en | |
| dc.subject | 多點協調傳輸技術 | zh_TW |
| dc.subject | Coordinated Multi-Point | en |
| dc.title | LTE-A 多點協調傳輸技術之最佳傳輸點選擇 | zh_TW |
| dc.title | Optimizing Transmission Point Selection for Coordinated Multi-Point Transmission in LTE-Advanced Systems | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 99-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 魏宏宇(Hung-Yu Wei),馮輝文(Huei-Wen Ferng),蔡欣穆(Hsin-Mu Tsai) | |
| dc.subject.keyword | 多點協調傳輸技術, | zh_TW |
| dc.subject.keyword | Coordinated Multi-Point, | en |
| dc.relation.page | 91 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2011-08-21 | |
| dc.contributor.author-college | 電機資訊學院 | zh_TW |
| dc.contributor.author-dept | 電信工程學研究所 | zh_TW |
| 顯示於系所單位： | 電信工程學研究所 | |
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