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    Please use this identifier to cite or link to this item: http://ccur.lib.ccu.edu.tw/handle/A095B0000Q/593


    Title: LTE-A雙重連線異質網路中具基地台負載感知的基地台選擇機制;Cell Load-aware Cell Selection Mechanism in LTE-A Heterogeneous Networks with Dual Connectivity
    Authors: 陳郁吟;Chen, Yu-Yin
    Contributors: 資訊工程研究所
    Keywords: LTE-A;雙重連線;服務基地台選擇;負載平衡;LTE-A;Dual Connectivity;Cell selection;Load balance
    Date: 2017
    Issue Date: 2019-07-17
    Publisher: 資訊工程研究所
    Abstract: 隨著數據傳輸量的增長,小型基地台在長期演進技術成為重要的角色,歸功於小型基地台低功率和佈建成本低的特性,大型基地台的收訊死角或邊緣地區都能透過佈署小型基地台獲得改善,由小型基地台和大型基地台構成的異質網路,因兩者運行於同一個頻段,因此覆蓋範圍重疊時會出現干擾的情況。第三代合作夥伴計劃發表Release 12提出不同頻及雙重連線的概念,雙重連線指的是使用者裝置同時與大型基地台和小型基地台連線,處於基地台邊緣的裝置能藉此增加傳輸效能,大型基地台覆蓋範圍廣,若能與大型基地台保持連線,也可增進移動的穩固性,而且小型基地台使用比大型基地台更高的頻帶,就不會有干擾的問題。為了舒緩熱點區域網路壅塞的問題,可增加小型基地台的佈署密度,由數個小型基地台集合而成的稱為小型基地台叢集,當佈建密度上升時,必須有合適的方法來避免乒乓效應。本論文提出費用函數,為具有感知基地台負載狀況的服務基地台選擇機制,常見的方法多以使用者裝置接收到的傳輸功率強弱,作為選擇的依據。但訊號最好的基地台不一定能提供最好的服務品質,尤其當網路壅塞,基地台剩餘資源不足以提供使用者需求,因此我們能透過費用函數計算使用者由此基地台進行服務的費用,判斷出最佳的服務基地台。最後,我們將不同頻、雙重連線與提出的選擇機制作整合,並設計模擬情境來評估其表現,模擬結果顯示費用函數能有效促進基地台的負載平衡,並有良好的效能表現。
    As the demand of data traffic grows, small cell has become a key solution to boost network efficiency. Characterized by its lower power consumption and less deployment cost, small cell can be massively deployed to the cell edge and coverage holes of macro stations, increasing the capacity of network. However, high interference can be expected if the macro cells and the small cells share the same spectrum. To cope with the situation, 3GPP Release 12 proposed the concept of dual connectivity. By dual connectivity, user equipment (UE) can connect to both a macro cell and a small cell simultaneously to increase network efficiency. Edge UEs can increase the robustness of mobility by connecting to the macro cell. In addition, to reduce interference between macro cell and small cells, the frequency (spectrum) of macro cell may be different from that of small cells.To solve the network congestion issue in the hotspot area, a typical solution is to increase the density of small cell deployment. Nearby small cells may formed a cluster. The conventional cell selection model is determined by signal power like reference signal received power (RSRP) or signal-to-interference-plus-noise ratio (SINR). With the higher density of the small cell deployment, a UE may easily handoff from one small cell to another one, causing the ping-pong effect. Furthermore, despite having better signal, the base station might unable to provide enough resource to its associated UEs when congestion happens. In this paper, we proposed a cell selection mechanism based on a cost function which is used to evaluate the traffic load of cells. Simulation results show that our proposed algorithm can improve load balance and conduct good performance in comparison with conventional studies.
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