The Joint Allocation of Spectrum Resources With Power Control in Ultra Dense Networks

Ultra-dense networks is an effective technology to increase the network capacity by deploying a large number of small base stations. But, in cellular downlink networks, the inter-cell interference deteriorates rapidly with the increase of small base station (SBS) density. How to manage and coordinate inter-cell interference is a hot research topic in 5G wireless communication system. In this paper, we assume that each user-equipment tagged with its closest SBS (the nearest SBS in distance) and all other SBSs using the same frequency spectrum resources simultaneously act as interferers. We propose our model based on Poisson point process and coordinate the interference to improve the signal-to- interference ratio by joint allocation of spectrum resources with power control between the first and second closest SBSs of each UE. The simulation results show the coverage probability is greatly improved with our allocation algorithm.