臺灣博碩士論文加值系統

第三代合作夥伴計畫為了要達到先進國際行動通訊的內容規範，在先進長程演進計畫中引進了載波聚合技術，並提倡通信業者建置家用基地台來解決室內場所通訊品質不良的問題。
由於用戶可以不經過事先網路規劃自行建置家用基地台於室內環境，導致不規則HeNB佈建情況，將造成自身基地台與鄰近基地台之間、或自身使用者與鄰近使用者設備之間、或自身基地台與鄰近使用者設備之間的傳輸訊號干擾狀況發生。因此，第三代合作夥伴計畫提出了標準自主載波選擇，每個家用基地台會依照干擾狀況選擇適合的載波，以避免家用基地台之間嚴重的干擾。但此方法的載波分配機制並不完善，仍舊會造成載波使用效率不佳、使用者連線數低、或系統容量不佳等問題。
本論文以提升整體系統容量為主要目標，在標準自主載波選擇的載波分配方法架構下提出一個新的載波重新分配演算法，以用戶被干擾程度及距離為基礎之自主載波分配(ACCS based on User Interfered level and Distance ; ACCS-UID)。此演算法優先分配載波給受到較嚴重干擾的使用者設備，接著再分配載波給干擾較輕微的使用者設備。期望能夠藉由載波的重新分配，改善原本受到嚴重干擾使用者設備的通道品質並提升其鏈路容量，進而提升整體的系統容量。模擬結果顯示，本論文提出的ACCS-UID演算法與標準自主載波選擇相比，幾乎能夠維持相同的載波分配數量，但由於載波受到干擾的情形改善了，使得載波資源有較佳的頻譜效益，進而使得系統容量增加。

To conform to the standards of the international mobile telecommunications advanced (IMT-Advanced), 3GPP utilizes the technology of carrier aggregation (CA) in the long term evolution advanced project (LTE-Advanced) and advocates businesses in the communication industry establishing home NodeB (HeNB) to solve the problem of poor communication quality in indoor environments.
Irregular HeNB establishments can be caused by users when establishing HeNB in indoor environments without prior network planning. Consequently, the irregular establishments will cause problems such as signal interferences between HeNB and neighboring HeNB, user equipment (UE) and neighboring UE or HeNB and neighboring UE. Therefore, 3GPP proposed the approach of autonomous component carrier selection (ACCS), which enable each HeNB to select appropriate component carrier (CC) according to the interference conditions of neighboring HeNB to avoid serious carrier interference. However, due to the some existing imperfections of the ACCS selection mechanism, there still remain problems such as poor performance of system capacity, poor carrier utility, and low connection of UE.
The main purpose of this study is to enhance the overall system capacity. We propose a new carrier reselection algorithm - ACCS based on User Interfered level and Distance (ACCS-UID) under the basic carrier selection framework of ACCS. This algorithm assigns CC to the UE who is severely interfered, and then to the UE who is slight interfered. We expect that carrier reselections will improve the channel quality of severely interfered UE and increase its capacity, and, thus, improve the overall system capacity. Finally, simulation results show that ACCS-UID proposed by this study can maintain the same number of assigned CC in most cases. And, at the same time, increases the system capacity which optimized a better spectrum efficiency of system carrier resources by improving carriers interfered level.

摘要
Abstract
誌謝
目次
圖目次
表目次
第 一 章 緒論
1.1 簡介
1.2 研究動機與目的
1.3 章節概要
第 二 章 LTE-Advanced概述
2.1 LTE-Advanced介紹
2.1.1 載波聚合簡介
2.1.2 載波聚合配置情境
2.1.3 基地台簡介
2.1.4 毫微微型基地台簡介
2.1.5 標準自主載波分配機制
2.2 問題描述
2.3 相關研究
第 三 章 自主載波重新分配 - ACCS-UID
3.1 研究方法
3.1.1 初始情境設置
3.1.2 ACCS載波分配
3.1.3 主載波重新分配
3.1.4 次載波重新分配
3.1.5 容量計算與儲存最佳配置
3.1.6 主載波與次載波重新分配機制範例
第 四 章 系統模擬與結果
4.1 模擬環境與參數
4.2 效能評估項目
4.3 模擬結果分析與比較
4.3.1 室內辦公室覆蓋半徑為對角線一半長度之佈建環境
4.3.2 室內辦公室覆蓋半徑為對角線長度之佈建環境
4.3.3 室內家庭佈建環境
第 五 章 結論
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