研究生: |
李婉萱 Wan-Hsuan Li |
---|---|
論文名稱: |
LTE在穿透式中繼網路環境下以通道品質為基礎之資源分配研究 A Study on CQI Based Resource Allocation for Transparent Relay Network in LTE |
指導教授: |
黎碧煌
Bih-Hwang Lee |
口試委員: |
陳俊良
Jiann-Liang Chen 吳傳嘉 Chwan-Chia Wu 馮輝文 Huei-Wen Ferng 陳漢宗 Hann-Trong Chen |
學位類別: |
碩士 Master |
系所名稱: |
電資學院 - 電機工程系 Department of Electrical Engineering |
論文出版年: | 2012 |
畢業學年度: | 100 |
語文別: | 中文 |
論文頁數: | 63 |
中文關鍵詞: | LTE 、CQI 、資源分配 |
外文關鍵詞: | LTE, CQI, Resource allocation |
相關次數: | 點閱:208 下載:3 |
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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.
[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)”
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