研究生: |
楊羚 Ling - Yang |
---|---|
論文名稱: |
於LTE之手機端換手參數自我優化演算法的設計與評估 Design and Evaluation of a Handover Parameter Self-Optimization Algorithm for User Equipments in LTE |
指導教授: |
馮輝文
Huei-wen Ferng |
口試委員: |
鄭傑
Jay Cheng 林嘉慶 Jia-chin Lin 吳中實 Jung-shyr Wu 黎碧煌 Bih-hwang Lee |
學位類別: |
碩士 Master |
系所名稱: |
電資學院 - 資訊工程系 Department of Computer Science and Information Engineering |
論文出版年: | 2012 |
畢業學年度: | 100 |
語文別: | 中文 |
論文頁數: | 48 |
中文關鍵詞: | 長期演進 、換手 、乒乓 、自我優化 、自我組織網路 |
外文關鍵詞: | LTE, Handover, Ping-Pong, Self-Optimization, Self-Organizing Networks |
相關次數: | 點閱:391 下載:2 |
分享至: |
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在無線網路日亦成長的時代,
基地台必須處理更多行動裝置, 因此基地台的負擔越來越重;
然而,使用有效的換手參數來減少換手失敗和多餘的換手次數,
可以很直接的減輕基地台的負擔, 尤其是在高速環境下;
然而,營運商不可能一一的手動調整和維護換手參數,
所以在3GPP Release 8中提出自我優化(Self-Optimization)機制,
它會根據基地台之間的測量報告去調整換手參數,
但目前的優化機制都是實作在基地台中, 無法切實解決UE個別的狀況;
本論文針對此點,
提出新的演算法USP (UserEquipment Specific Parameter)根據UE本身的狀況去調整並執行於UE上,
如此一來不但能找出適合的參數又能分攤基地台的工作。
最後,透過模擬結果顯示, USP改善整體的系統換手失敗率、Ping-Pong率和大部分的欲想換手的次數。
With the rapid growth of mobile communication, base stations need to handle more mobile devices, so the load will be much heavier in the base stations.
However, using the effective handover parameters can decrease handover failure and redundant handovers, and also alleviate base stations' load directly, especially in the high speed environment.
It's difficult to adjust and maintain the handover parameters by operator one by one, so the 3GPP LTE Release 8 introduces the self-optimization mechanism which can collect the information between neighboring nodes.
Although the self-optimization algorithm is executed by the base station mostly, it can't really solve the problems on UE.
In order to solve this problem, our thesis introduces the USP (UserEquipment Specific Parameter) algorithm which can auto-modify the handover parameters by collecting the UE's real condition.
This algorithm is executed by UE, so that USP not only can adjust the proper parameters but reduce the load from base stations.
Finally, according to our simulation results, USP decreases system's handover failure ratio, Ping-Pong ratio and most of the redundant handovers.
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