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The Research on the Intercell Interference Coordination for Downlink OFDMA Wireless Cellular Networks

Author: LiuLu
Tutor: QuDaiMing
School: Huazhong University of Science and Technology
Course: Communication and Information System
Keywords: Inter-cell interference Frequency multiplexing User scheduling Power Control Weighted rate and
CLC: TN929.531
Type: Master's thesis
Year: 2011
Downloads: 8
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Abstract


Orthogonal frequency division multiple access in order to be able to provide high - speed wireless multimedia service in the next generation of wireless cellular network , has been proposed as an effective multi - access scheme . OFDMA cellular network , due to the orthogonality between subcarriers , the interference within the cell is almost does not exist . However, since the network frequency reuse factor is 1 , it will produce severe inter-cell interference , limiting the throughput of the system , severely reducing the edge user throughput . In this article , we propose a number of inter-cell interference coordination method to suppress the inter - cell interference in OFDMA cellular networks . First , we propose a dynamic fractional frequency reuse interference avoidance request mechanism to suppress the inter-cell OFDMA cellular network downlink channel interference . The core idea of this method is the exchange between base stations interference avoidance request packet , then each base station transmit power control based on the dynamic of the received message . For the elastic data traffic , interference avoidance request mechanism with proportional fairness algorithm combined with each other to effectively balance the relationship between the total cell throughput and cell edge user throughput . System level simulation results show that the proposed dynamic fractional frequency reuse method is better than the reference frequency multiplexing method cell total throughput and fairness among the cell edge user throughput and user performance . In addition , the proposed dynamic fractional frequency multiplexing method does not require a centralized controller hub , the industry is very little of the information exchanged between base stations . Next, we the OFDMA Cellular network downlink channel inter-cell interference into a weighting rate , and the problem of maximizing . Weighted rate maximization problem is a combination of a non- convex problem difficult to solve in practice . Therefore , we present and discuss three low complexity suboptimal algorithm to solve the problem . These three algorithm is mainly the user scheduling and power control of a joint between the cooperative cell to solve the problem of weighting rate and maximized . The system-level simulation results , we propose three methods to obtain the weighted rate and is very close to the exhaustive search algorithm . In addition , the proposed distributed iterative algorithm , not only is a distributed algorithm , and rapid convergence , the application is the most suitable in the actual system .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Mobile Communications > Cellular mobile communications systems (mobile phones, mobile phone handsets ) > Frequency division multiple access (FDMA) mobile communication
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