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Directional transmission is one of key technology to solve the utmost problem that current mobile communication system faces, which is explosively increasing data traffic, since directional transmission can maximize the throughput of mobile communication systems. In this work, we consider power allocation scheme for mobile communication system which utilizing directional transmission. Especially, we consider the case in which multiple users in the same sector of base station, are served at the same time by utilizing directional transmission. For this scenarios, we consider equal power allocation scheme, Water-filling based scheme and inverse SNR scheme. Moreover, we propose beam power allocation scheme whose objective is to maximize overall system throughput by taking into account interference between different directional transmissions. Moreover, we have examined the spectral efficiency and Jain's fairness index of various power allocation schemes for directional transmission by using system level simulator that has been developed in our previous work. Through simulations, it has been verified that the proposed power allocation scheme can improve the spectral efficiency of the system by 28%.  :  ,  , ,   ,  Key word : Directional Transmission, Power Allocation, Optimization, System-Level Simulator, Performance Evaluations Journal of the Korea Institute of Information and Communication Engineering (J. Korea Inst. Inf. Commun. Eng.) Vol. 18, No. 11 : 2621~2627 Nov. 2014

Power Allocation Scheme For Mobile Communication Systems Using Directional Transmission