SENSITIVITY OF CELLULAR WIRELESS NETWORK PERFORMANCE TO SYSTEM & PROPAGATION PARAMETERS AT CARRIER FREQUENCIES GREATER THAN 2 GHz (original) (raw)
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IEEE Transactions on Wireless Communications, 2014
Small cell networks are evolving as an economically viable solution to ameliorate the capacity and coverage of state-of-the-art wireless cellular systems. Nonetheless, the dense and unplanned deployment of the small cells (e.g., femtocells, picocells) with restricted user access significantly increases the impact of interference on the overall network performance. To this end, this paper presents a novel framework to derive the statistics of the interference considering dedicated and shared spectrum access for uplink transmissions in two-tier small cell networks such as the macrocell-femtocell networks. The framework exploits the distance distributions from geometric probability theory to characterize the uplink interference while considering a traditional grid-model setup for macrocells along with the randomly deployed femtocells. The derived expressions capture the impact of path-loss, composite shadowing and fading, uniform and non-uniform traffic loads, spatial distribution of femtocells, and partial and full spectral reuse among femtocells. Considering dedicated spectrum access, first, we derive the statistics of the co-tier interference incurred at both femtocell and macrocell base stations (BSs) from a single interferer by approximating Generalized-K composite fading distribution with the tractable Gamma distribution. We then derive the distribution of the number of interferers considering partial spectral reuse and moment generating function (MGF) of the cumulative interference for both partial and full spectral reuse scenarios. Next, we derive the statistics of the crosstier interference at both femtocell and macrocell BSs considering shared spectrum access. Finally, we utilize the derived expressions to analyze the capacity in both dedicated and shared spectrum access scenarios. The derived expressions are validated by the Monte-Carlo simulations. Numerical results are generated to assess the feasibility of shared and dedicated spectrum access in femtocells under varying traffic load and spectral reuse scenarios.
Comparison of Some Inter-Cell Interference Models for Cellualar Networks
International Journal of Wireless & Mobile Networks
In this paper we discuss and compare methods to analyse the influence inter-cell interference will have on coverage/outage probabilities in cellular networks. The framework is based on a common method to find the Laplace transform of the distribution of interference from neighbouring cells. It turns out that for Suzuki distributed fading the analysis is highly simplified. In case of Rayleigh faded channels only, the analysis is even more simplified. The modelling approach, which is based on classical probab ility methods, rather than on modern measure theory for point processes, allows for both fixed and stochastic locations of base stations. The different models are applied to quantify the effect of inter-cell interference on coverage/outage probabilities and on spectrum efficiencies in LTE networks. We consider several scenarios ranging from fixed hexagonal layout of base station to stochastic location of based on uniform distribution of base stations. We also extend the coverage/outage analysis for the Gin ibre Point Process to Suzuki faded environment. Numerical examples show large differences in both spectrum efficiency and coverage/outage probabilities for the different network scenarios considered.