Coverage analysis of cell‐edge users in heterogeneous wireless networks using Stienen's model and RFA scheme. (9th September 2019) - Haroon, Muhammad Sajid
Summary: In heterogeneous wireless networks, signal‐to‐interference‐plus‐noise ratio (SINR) suffers degradation due to strong interference received by users from offloaded macro base station ( m BS). Similarly, cell‐edge users experience low SINR due to their distant locations. Moreover, small base stations ( s BSs) located in the vicinity of m BS experience reduced coverage due to the high transmit power of m BS. To overcome these limitations, we use Stienen's model as a base station deployment strategy to improve network performance gain. More specifically, we use reverse frequency allocation (RFA) as an interference management scheme together with Stienen's model to significantly improve SINR, enhance edge user coverage, and avoid s BS deployment near the m BS. In the proposed set‐up, the available coverage region is divided into two noncontiguous regions, ie, center region and outer region. Furthermore, m BSs are uniformly distributed throughout the coverage region using independent Poisson point processes, while s BSs are deployed only in outer region using Poisson hole process (PHP). Closed‐form expressions for coverage probabilities are characterized for the proposed model. Numerical results show that the proposed scheme yields improved SINR with enhanced edge user coverage and requires fewer number of s BSs. Abstract : In this paper, Stienen's model is investigated in comparison with uniform and traditional non‐uniform HWNet models. Moreover, RFA scheme is studied in conjunction with Stienen's, uniform and non‐uniform HWNet models. The results indicate that Stienen's model outperforms uniform and non‐uniform models in terms of coverage probability of m BS in the outer region due to the fact that in Stienen's model, there is minimum repulsive distance between m BSs that other models lack. Moreover, the results demonstrate a maximum of 58% improvement at ‐17 dB by the proposed model as opposed to the traditional non‐uniform model. Furthermore, the results show that the RFA scheme outperforms the SFR scheme in terms of interference management. From the operators' perspective, fewer number of deployed sBSs results in lower deployment cost and reduced interference level, thus, an improved network performance. As future work, decoupled user association can be used with the Stienen's model to achieve better coverage performance.