An Interference Coordination Scheme in Ultra-Dense Networks Based on Power Control

A large number of small cells are deployed in a traditional heterogeneous network to form an ultra-dense network. The ultra-dense network effectively increases the capacity of the network, but also introduces serious interference problems between low-power nodes. In order to solve the problem of downlink interference existing in the ultra-dense network, a new technical scheme based on power control (PCICS) is proposed. The PCICS scheme simultaneously determines the number of neighbor nodes around the central node and the size of the interference to the neighboring nodes as the determining node that needs to control the power. Then it translates the interference from neighboring nodes into its distance from the central node. It simplifies the method of determining the size of the interference. Then the node that meets the threshold condition is determined as the interference source node. Finally, the interference source node controls the transmission power under the condition of ensuring the normal communication of the user according to the feedback signal of the user. Therefore, the proposed solution minimizes interference to system users. Experimental data show that, compared to the TAPB algorithm, the average degree of system interference of the proposed scheme is basically the same. The average SINR is increased by 5~8dB. The average system throughput is increased by about 50%. Simulation results demonstrate that, in the case of increasing the interference source node judgment condition, the proposed scheme can effectively improve the system throughput and reduce the system power loss.