Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/90775
標題: LTE網路中具備衰落感知的換手決策機制
An Enhanced Handover Decision Mechanism with Fading-aware for LTE Networks
作者: Wei-Hong You
游惟閎
關鍵字: LTE
Hard handover
Handover decision
Fading-aware
Data transmission estimate
長期演進技術
換手決策
硬式換手
衰落感知
資料傳輸預估
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摘要: By adopting hard handover (HO) in LTE network, the user equipment (UE) first detaches from SeNB before it attaches to TeNB. The data transmission rate may be decreased because of the disconnection during the handover procedure. Especially, when a UE is at the border of the signal coverage between SeNB and TeNB, the interference caused by environment may be severe, which causes frequently switching among eNBs due to inappropriate handover triggering decisions. Too frequent eNB association changes leads to decrease in data transmission and increase in data loss, which results in QoS suffering. To resolve this problem, we propose an enhanced HO mechanism with fading awareness and the offset estimation in transmission throughput in the HO triggering determination. Upon detecting the interference on signal fading, a refined HO procedure is taken place to minimize the data loss rate, while a HO is promptly triggered to reduce the latency in case of no fading interference. As compared with the HO mechanism with parameters, simulation results show that the proposed method can effectively reduce 30% average HO times and 8% data loss rate.
長期演進技術(Long Term Evolution, LTE) 網路的換手方式,屬於先與服務基地台斷線後再連線到目標基地台的硬式換手,因此用戶端設備進行換手時,勢必有一段時間會處於喪失傳輸能力的狀態。由於LTE網路具備較高的資料傳輸率,因此,中斷極短的時間也會使得換手時的資料傳輸率下降,資料遺失率增加。尤其當用戶端設備處於基地台覆蓋範圍的交界時,因環境因素對於訊號的干擾程度相對上升,嚴重影響換手觸發的對象及時機判斷的正確性,造成用戶端設備在短時間內進行多次換手。這些換手動作,使用戶端設備在短時間內遭受到較長的連線中斷時間,不僅嚴重降低資料傳輸率,更因短時間多次進行基地台間的切換,加劇遺失資料量,嚴重影響服務品質。針對此問題,本論文在原本標準換手決策機制的基礎上,加入衰落感知機制與資料傳輸預估機制,以決定適當的換手時機。當用戶端設備受到訊號衰落的干擾時,能以降低的資料傳輸率為最少的情況下執行換手;而在進行不受訊號衰落的干擾而觸發的換手時,也可快速換手以減少換手的時間。最後實驗結果顯示,本文的方法比起使用參數的換手機制,至少可降低30% 以上的平均換手次數,並減少約8% 以上的資料遺失率。
URI: http://hdl.handle.net/11455/90775
其他識別: U0005-0807201410005600
文章公開時間: 2017-07-11
Appears in Collections:資訊科學與工程學系所

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