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％。

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%.

[1] Hyung G. Myung, and David J. Goodman, “ SINGLE CARRIER FDMA A NEW AIR INTERFACE FOR LONG TERM EVOLUTION “ ,1st ed., John Wiley and Sons Ltd, pp37-38 ,2008.
[2] Harri Holma, and Antti Toskala, “ LTE for UMTS –OFDMA and SC-FDMA BasedRadio Access “ ,1st ed., John Wiley and Sons Ltd,pp.79-80, 2009.
[3] R1-073224, “Way forward on power control of pusch,” 3GPPTSG-RAN WG1 49-bis, 2007.
[4] 3GPP TS 36.211 V8.7.0, “Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation(Release 8),”.pp.9-11, (2009-05).
[5] 3GPP TS 36.211 V8.7.0, “Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation(Release 8),” .pp.12 , (2009-05).
[6] Rao Anil M, “Reverse link power control for managinginter-cell interference in orthogonal multiple access systems,”Vehicular Technology Conference, 2007. VTC-2007 Fall. 2007 IEEE 66th (2007).
[7] Nestor J. Quintero., “Advanced Power Control for UTRAN LTE Uplink”., Department of Electronic Systems Aalborg University, .A thesis submitted for the degree of Master of Science, .pp.9-26 ,June 19th, 2008.
[8]R. Müllner, C.F. Ball, K. Ivanov, J. Lienhart, and P. Hric, "Uplink Power Control Performance in UTRAN LTE Networks", in Proc. MCSS, 2009, pp.175-184.
[9]R. Müllner, C.F. Ball, K. Ivanov, J. Lienhart, and P. Hric, "Performance comparison between open-loop and closed-loop uplink power control in UTRAN LTE networks", in Proc. IWCMC, 2009, pp.1410-1416.
[10] Simonsson, A.; Furuskar, A.; Wireless Access Networks, Ericsson Res., Research Triangle Park, NC “ Uplink Power Control in LTE –Overview and Performance” Vehicular Technology Conference, 2008. VTC 2008-Fall. IEEE 68th
[11] Y. Okumura, E. Ohmori, T. Kawano, and K. Fukuda. Field strength and its variability in VHF and UHF land-mobile radio service. Review of the Electrical Communication Laboratory, 16(9-10), 1968.
[12] M. Hata. Empirical formula for propagation loss in land mobile radio services. IEEE Transactions on Vehicular Technology, 29(3), 1980.
[13] 3GPP TS 36.104 V8.6.0, “Evolved Universal Terrestrial Radio Access (E-UTRA); Base Station (BS) radio transmission and reception(Release8)”,Table B.2-3 Extended Typical Urban model (ETU),pp.61, (2009-05).
[14] W.C Jakes, “MicroWave Mobile Communications.”,New York, Wiley 1974
[15] 3GPP TS 36.213 V8.7.0 ,“ Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures(Release8)”, pp.9, (2009-05).
[16] 3GPP TS 36.214 V8.6.0 ,“Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer – Measurements(Release 8)”, (2009-03).
[17] 3GPP TS 36.331 V8.6.0, “Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC) ;protocol specification(Release 8)” , (2009-06).
[18] Ericssion R1-073036, “Intra-cell Uplink Power Control for E-UTRA – Evaluation of Fractional Path Loss Compensation”, #GPP TSG RAN WG1 Meeting #49,(2007-06).
[19] 3GPP TS 36.213 V8.7.0, “ Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures(Release8).”, pp.12, (2009-05).
[20] 3GPP TS 36.213 V8.7.0, “ Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures(Release8).”, pp.9-11, (2009-05).
[21] 3GPP TR 25.814 V7.1.0, “ Physical layer aspects for evolved Universal Terrestrial Radio Access (UTRA).”, ANNEX A: Simulation scenarios,pp.116-130, (2006-09).
[22] 3GPP TS 36.104 V8.6.0, “Evolved Universal Terrestrial Radio Access (E-UTRA); Base Station (BS) radio transmission and reception(Release8)”,Table E.5.1-1 EVM window length for normal CP ,pp.69, (2009-05).
[23] Bilal Muhammad,” Closed loop power control for LTE uplink”,Chap 4.1 Investigation for the optimal value of the PL compensation factor , Blekinge Institute of Technology School of Engineering, November 2008.