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研究生:黃雅喻
研究生(外文):Ya-Yu Huang
論文名稱:利用基地台預選暨參數自我優化之LTE-A 異質網路換手機制設計
論文名稱(外文):Design of a Handover Scheme with eNode-B Pre-Selection and Parameter Self-Optimization for LTE-A Heterogeneous Networks
指導教授:馮輝文
口試委員:馮輝文
口試日期:2015-07-31
學位類別:碩士
校院名稱:國立臺灣科技大學
系所名稱:資訊工程系
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:2015
畢業學年度:103
語文別:中文
論文頁數:52
中文關鍵詞:長期演進換手移動狀態估計自我優化移動性
外文關鍵詞:LTEHandoverMSESONMobility
相關次數:
  • 被引用被引用:0
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  • 收藏至我的研究室書目清單書目收藏:0
智慧行動裝置變得普及,資料流量也急遽增加,在長期演進系統中,傳統大型基地台的負擔越來越重,為了分擔大型基地台的負載,低功率基地台將相對應地被部屬,例如: 小型基地台,這樣包含大型基地台以及小型基地台的異質網路是本論文所考量的。對於這樣的異質網路,我們將討論如何適當地選擇基地台以改善換手效能,尤其是在高速的環境下。在我們的設計中,基地台預選策略提出了根據預先定義的速度門檻值與服務品質需求將使用者設備進行分類。對於不同類型的使用者設備,不同的偏好被設定,使得高速的使用者設備主要被大型基地台所照料,同時低速或服務品質需求較低的使用者設備則被卸載到小型基地台的服務區域,以減輕大型基地台的負擔。此外,還提出一個動態換手參數調整的機制,藉由考量換手失敗率、乒乓效應率、速度以及使用者移動的歷史紀錄等。最後,透過大量的模擬,在換手次數、失敗率以及乒乓率方面,顯示了我們的設計優於其他文獻中的相關機制。
As personal intellectual mobile devices become pervasive, data traffic increases drastically, causing a much heavier burden to the traditional macro eNode B (eNB) in the long term evolution (LTE) system. To share the load of macro eNBs, lowpower base stations, e.g., pico eNBs, are deployed accordingly. Such a heterogeneous network (HetNet) with macro and pico eNBs is then considered in this thesis. For such a HetNet, we will address how to appropriately select an eNB to improve handover performance, especially in the high-speed environment. In our design, a base station pre-selection strategy is proposed to classify user equipments (UEs) according to the pre-defined thresholds of speed and quality of service (QoS) requirements.For different types of UE, different preferences are then set so that high-speed UEs are primarily taken cared by macro eNBs while lowspeed or low QoS UEs are offloaded to the service area of pico eNBs to share the load of macro eNBs. Additionally, a dynamic handover parameter adjustment mechanism is proposed by considering the handover failure ratio, ping-pong effect ratio, speed, and mobility history etc. Finally, we show the superiority of our design over some related mechanisms reported in the literature in terms of number of handover, radio link failure ratio, and ping-pong ratio via extensive simulations.
中文摘要 iii
英文摘要 iv
目錄 v
表目錄 vii
圖目錄 viii
第一章、緒論 1
1.1 LTE/LTE-A 基本架構介紹 1
1.2 異質網路(Heterogeneous Network, HetNet) 4
第二章、相關文獻回顧 7
2.1 換手失敗和相關問題 7
2.2 遲滯和觸發時間參數 10
2.3 自我組織網路 11
2.4 自我優化機制 13
第三章、基地台預選暨參數自我優化之換手機制 16
3.1 EPPS 機制設計與描述 16
3.1.1 基地台預選策略 17
3.1.2 參數自我優化 19
3.2 基地台預選暨參數自我優化之換手機制演算法 21
3.2.1 基地台預選 22
3.2.2 測量速度 22
3.2.3 移動歷史紀錄 25
3.2.4 換手失敗率 26
3.2.5 乒乓率 26
第四章、模擬結果與討論 27
4.1 模擬環境與參數設定 27
4.2 結果與討論 30
4.2.1 換手次數的比較 32
4.2.2 封包遺失率的比較 34
4.2.3 無線鏈結失敗率的比較 35
4.2.4 乒乓率的比較 37
4.2.5 不同小型基地台數量下三種效能指標的比較 39
4.2.6 隨機速度下三種效能指標的比較 40
第五章、總結 47
參考文獻 48
誌謝 52
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