臺灣博碩士論文加值系統

長期演進（Long Term Evolution；LTE）技術系統之無線頻寬資源可視為由頻率與時間交織而成的資源區塊（Resource Block；RB）。為了有效的利用LTE無線頻寬資源，許多研究開始著墨在資源分配的排程上，希望可以藉由好的資源分配排程方法使資源不會被浪費。而現今以通道品質指標（Channel Quality Indicator；CQI）為基礎的資源分配方法，大多是僅以系統CQI或是單以資源區塊的CQI做為資源分配的依據。另外，在LTE環境中，靠近細胞邊緣的使用者常常會因為訊號不良進而影響傳輸效率的狀況。
為了解決上述問題，本論文提出了一個在穿透式中繼網路下以CQI為基礎之資源分配方法，稱為CBRA（CQI Based Resource Allocation）。在方法中，利用CQI等級的高低和系統分配率的大小做為優先權的選擇依據，當分配率越小或是CQI等級越高優先權越高，而當分配率越大或是CQI等級越小則優先權越低。然而在分配資源區塊時，系統根據兩種不同的CQI等級互相搭配來選擇適當又可以增加其它使用者產能的資源區塊，希望藉此可以提高系統的公平性。而整個系統建置在以基地台為中心的穿透式中繼網路中，讓距離基地台較遠的使用者可以透過通訊品質較使用者好的中繼站幫忙傳送資訊以提高位於系統邊緣的使用者之通訊品質。

The radio resource in LTE is made from RBs(Resource Blocks) which compose of frequency domain and time domain. To use the radio resource efficiently, many papers have been focused on the resource allocation method and hope not to waist the resources by way of a good resource allocation scheduling. Now, most of the resource allocation methods based on CQI(Channel Quality Indicator) are only focus on the system CQI values or only on RB CQI values. Otherwise, in LTE, the UE(User Equipment) which is located on the cell edge may have a bad signal because of some factors.
In order to solve the above-mentioned problems, we proposed a resource allocation method which is based on the type II relay networks and on the CQI called CBRA (CQI Based Resource Allocation). In our method, eNodeB (eNB) allocates RBs according to the CQI and allocated rate of a UE. We select RBs by using the 2 types of CQI to gain the number of selectable RBs of other UEs. In this way, we hope to gain the system throughput and the fairness. However, the model we proposed is built on a system whose eNB is placed in the center of a transparent relay network cell to improve the communication quality on the cell edge users.

摘要 1
Abstract 2
誌謝 3
目次 4
圖目次 6
表目次 8
第一章 緒論 9
1.1 簡介 9
1.2 研究動機與目的 10
1.3 章節概要 11
第二章 LTE概述 12
2.1 LTE系統簡介 12
2.1.1 LTE 規格簡介 12
2.1.2 穿透式中繼站介紹 13
2.1.3傳輸架構 15
2.1.4資源區塊 17
2.1.5 TDD訊框架構 19
2.1.6 CQI介紹 23
2.2相關研究 24
第三章 資源分配排程架構及方法 26
3.1 系統基本架構 26
3.2 利用CQI做資源分配排程的研究方法 28

摘要 1
Abstract 2
誌謝 3
目次 4
圖目次 6
表目次 8
第一章 緒論 9
1.1 簡介 9
1.2 研究動機與目的 10
1.3 章節概要 11
第二章 LTE概述 12
2.1 LTE系統簡介 12
2.1.1 LTE 規格簡介 12
2.1.2 穿透式中繼站介紹 13
2.1.3傳輸架構 15
2.1.4資源區塊 17
2.1.5 TDD訊框架構 19
2.1.6 CQI介紹 23
2.2相關研究 24
第三章 資源分配排程架構及方法 26
3.1 系統基本架構 26
3.2 利用CQI做資源分配排程的研究方法 28
3.2.1 優先權的排定 29
3.2.2 資源分配排程方法 32
3.2.3 資源分配排程範例 35
第四章 模擬環境設定與結果 38
4.1 模擬環境 38
4.2 系統參數 43
4.3 效能評估項目與模擬結果分析 45
4.3.1 目的端為eNB之系統產能 45
4.3.2 使用者傳輸產能 49
4.3.3 系統平均傳輸延遲 52
4.3.4 封包丟棄率 54
4.3.5 公平性 56
4.3.6 資源區塊利用率 58
第五章 結論及未來研究 59
5.1結論 59
5.2 未來研究 60
參考文獻 61

[1]3GPP TS 36.211：” Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation (Release 10)”
[2]3GPP TS 36.300：” Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 10)”
[3]3GPP TS 36.814：” Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Further advancements for E-UTRA physical layer aspects (Release 9)”
[4]3GPP TS 36.213：”Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures (Release 10)”
[5]J-J. Huang, W-K. Lin and H-H Ko,” A Resource Allocation Algorithm for Maximizing Packet Transmissions in Downlink LTE Cellular Systems,” IEEE, 2011.
[6]R. Kwan, C. Leung and J. Zhang, “Resource Allocation in an LTE Cellular Communication System,” in Proc. IEEE ICC, 2009.
 
[7]G. Liebl, M.M. Thiago , A. Soysal, and E. Seidel. “Fair Resource Allocation for Inband Relaying in LTE-Advanced.” Munich: 2011.
[8]A.-M. Mourad, M. Electr., R. Brunel, A. Okazaki, U. Salim,” Channel Quality Indicator Estimation for OFDMA Systems in the Downlink,” Vehicular Technology Conference, 2007. VTC2007-Spring. IEEE 65th, 2007.
[9]W. Lee, and D-H. Cho. “CQI Feedback Reduction based on Spatial Correlation in OFDMA System.” Korea: Department of Electrical Engineering and Computer Science, Korea Advanced Institute of Science and Technology, 2008.
[10]HUANG, P.H., “Study on IEEE 802.11s MDA Reservation Mechanism for Dynamically Allocate Contention Period Ratio in Multi-channel Wireless Mesh Network,” Master dissertation, National Taiwan University of Science and Technology, Taipei, Taiwan. 2011.