The Interference Control Strategy In LTE-Advanced Heterogeneous Network

At present, with the maturity of 3G network deployment and commercialism, the communication industry focus has shifted to the standard formulation and industrial deployment of the fourth generation mobile communication system LTE-Advanced. LTE-Advanced has greater communication potential than IMT-2000 system to support more than 1Gbit/s peak rate and 100MHz bandwidth. LTE-Advanced bases on OFDM technology, its uplink uses single-carrier DFT-SOFDM and its downlink uses OFDMA as multiple access method. Through using multiple antennas technologies (MIMO, COMP, etc.) in the transmitter and receiver, the system capacity improves exponentially, but at the same time, the inter-cell interference is also increasing exponentially, and tends to be more complex, which adversely affect the improvement of system performance.The inter-cell interference comes from multiple users which connect to different cells use the same time-frequency resources. In theory, a reasonable frequency coordination solution and power control techniques can be used to effectively manage the time-frequency resources to avoid or reduce interference. On the one hand, As the LTE-Advanced system introduces Relay/Pico and other small power base stations which forms the heterogeneous environment in order to better meet the hot spot coverage and edge coverage demands, the system architecture becomes more complex, which requires specially designed frequency coordination and power control techniques between base stations using non-equal transmit powers. On the other hand,3GPP Release10 requires that the LTE-Advanced system supports carrier aggregation technique, which provides us a new train of thoughts for the inter-cell interference control strategy, the isolation between different carriers and interference sensing technology can be made full use of in solution design to avoid interference.This paper gives an eye to interference control technologies in LTE-Advanced heterogeneous network environment, and focus on the interference coordination scheme and power control technology of both data channel and control channel, through system simulation of the various ICIC schemes and technologies based on the laboratory LTE-Advanced simulation platform, we analyze the system throughput, SINR cumulative distribution curve, interference on the observed signal strength and other parameters and obtain the conclusion that our improved solution can effectively inhibit the interference in LTE-Advanced heterogeneous network environment and enhance the system performance. In this paper, we also give a brief introduction and analysis of interference-aware scheme which based on Picos and design a simplified LTE-Advanced system interference-aware implementation process.