LTE 上行閉迴路功率控制研究

Study of Closed loop power control for LTE Uplink

杜嘉偉(CHIA-WEI TU)

指導教授 ： 陳永芳

國立中央大學/資訊電機學院/通訊工程研究所碩士在職專班/碩士(2011年)

摘要

上行功率控制在長期演進（LTE）網路中決定了終端設備上行鏈結的效率和減少功率的消耗。本文介紹了上行功率控制程序，尋找最佳訊雜比設定和評估系統容量的方法。另外在細胞平均傳輸率和邊緣傳輸率上存在權衡交換的關係，發現閉迴路功率控制下，當導入部分路徑損耗補償係數設定目標 SINR值，可發現有效提升整體系統容量和細胞邊緣傳輸率。
對於不同的用戶活躍比例，模擬結果顯示，在閉環功率控制下路徑損耗補償係數有一個優化的解決方案。在細胞邊緣應用服務的傳輸量達到要求時，找出最佳的平均細胞傳輸率或最佳的功率效率。
模擬結果顯示，在用戶活躍比例為 0.8且細胞邊緣傳輸率相近時，平均細胞傳輸率改善 20％。而在相近的上傳功率和平均細胞傳輸率，細胞邊緣傳輸提高4％。

關鍵字

功率控制 ； 上行 ； 長期演進

並列摘要

Uplink Power Control in 3GPP UTRAN Long Term Evolution(LTE) networks is used to improve the mobile station uplink data rate and reduce power consumption. This paper presents the power control mechanisms and to find out optimal SINR setting and system capacity. About the trade-off between cell edge bitrate and average cell throughput, using the path loss compensation factor to configure the target SINR value will improve the cell capacity and cell edge bitrate. 　
For different user activity factor, simulation results indicated that the closed loop power control with path loss compensation factor has an optimization solution. Reaching the application service throughput requirement at the cell edge and find out the best average cell throughput or best power-efficiency.
The results of simulation show that the average cell throughput up to 20% at 0.8 loading user activity factor at the same cell-edge bitrates. At the same power and average cell throughput, the cell edge bitrates improved 4%.

並列關鍵字

Power Control ； LTE ； UpLink

參考文獻

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