Stochastic Geometry Analysis On Small Cell Network And Enhanced Technologies

In recent years, small cell network technology, as a new network tech-nology in mobile communication, is recognized as an effective solution to ex-plosive growth of mobile data traffic. Because of its smaller coverage range, the transmitters in the mobile network can have better communication quality with lower transmitting power. In the meanwhile the network power con-sumption is lowered; the utility of the wireless spectrum is improved through space division multiplexing.However, it comes to an inevitable problem how to deal with the severe inter-cell interference since the density of small cell base stations is much denser than the legacy macro call base stations’. This problem is also one of the focuses of the LTE standardization by3GPP. In this paper, we model the small cell network as a mathematical model based on stochastic geometry and focus on the network coverage probability, throughput and utility of wireless spectrum. By further study and analysis on the stochastic geometry model, the performance of the small cell network can be learnt and expressed as an ana-lytical expression. Then, we also propose an optimization of small cell net-work through interference coordination technology based on the frequency isolation.In this paper, we pay close attention to the small cell network with the telecommunication standard of TDD-LTE. Since much uncertainty in users and data traffic exist in the small cell network, which leads to a large dynamic in mobile data traffic, it is preferable to apply dynamic TDD technology to improve the performance of in small cell network. Using the stochastic geom-etry model in this paper, the performance of the dynamic TDD network in learnt, and the severe interference from downlink small cell base station to uplink base station is observed and studied. In order to copy with this inter-ference problem, we study an interference coordination technology based on almost blank subframe (ABSF). By numerical result s, we confirm that this interference coordination is an effective way to improve the uplink commu-nication quality. However, we also find that this improvement is in the ex-pense of the utility of downlink wireless resource. Therefore, this paper makes efforts to analyze and optimize the ABSF parameters in the interfer-ence coordination so that a balance between uplink communication quality and utility of wireless resource is achieved.