International Journal of Wireless & Mobile Networks (IJWMN) Vol. 5, No. 4, August 2013 DOI : 10.5121/ijwmn.2013.5404 49               !! "  A. Daeinabi 1 , K. Sandrasegaran 1 , and X.Zhu 2 Centre for Real-time Information Networks, School of Computing and Communications, Faculty of Engineering and Information Technology, University of Technology Sydney, Sydney, Australia Ameneh.Daeinabi@student.uts.edu.au, Kumbesan.Sandrasegaran@uts.edu.au School of Information and Communications, Beijing University of Posts and Telecommunications Beijing, China zhuxn@bupt.edu.cn ABSTRACT The Intercell Interference (ICI) problem is one of the main challenges in Long Term Evolution (LTE) downlink system. In order to deal with the ICI problem, this paper proposes a joint resource block and transmit power allocation scheme in LTE downlink networks. The proposed scheme is implemented in three phases: (1) the priority of users is calculated based on interference level, Quality of Service (QoS) and Head of Line (HoL) delay;(2) users in each cell are scheduled on the specified subbands based on their priority; and (3) eNodeBs dynamically control the transmit power using a fuzzy logic system and exchanging messages to each other. Simulation results demonstrate that the proposed priority scheme outperforms the existing Reuse Factor one (RF1) and Soft Frequency Reuse (SFR) schemes in terms of cell throughput, cell edge user throughput, delay and interference level. KEYWORDS LTE, intercell interference coordination, resource block allocation, transmit power allocation, fuzzy logic. 1. INTRODUCTION In recent years, the demand for mobile broadband services with higher data rates and better Quality of Service (QoS) is growing rapidly and this demand has motivated 3GPP to work on Long Term Evolution (LTE). One of their main goals was to define a simple protocol which involves both the radio access network (RAN) and the network core [1]. Moreover, it can obtain the peak rates of 100 Mb/s and a radio network delay of less than 5 ms, improve the spectrum efficiency and support the flexible bandwidth. In addition, the new flat network architecture can reduce the latency rather than 3G [2]. The multiple access technologies on the air interface are different in downlink and uplink of LTE systems; Orthogonal Frequency Division Multiple Access (OFDMA) is the downlink multiple access technology while for uplink, Single Carrier Frequency Division Multiple Access (SC-FDMA) is deployed [3]. Moreover, LTE supports frequency division duplex (FDD), time division duplex (TDD) as well as the wide range of system bandwidths which enables the system to work in a great number of different spectrum allocations [4].