Abstract
The overlay integration of low-power femtocells over macrocells in a heterogeneous network (HetNet) plays an important role in dealing with the increasing demand of spectral efficiency, coverage and higher data rates, at a nominal cost to network operators. However, the downlink (DL) transmission power of an inadequately deployed femtocell causes inter-cell interference (ICI), which leads to severe degradation and sometimes link failure for nearby macrocell users. In this paper, we propose an adaptive network sensing (ANS) technique for downlink power control to obviate the ICI. The simulation results have shown that the ANS power control technique successfully decreases the cell-edge macro user’s interference and enhances the throughput performance of macro users, while also optimizing the coverage and capacity of the femtocell. When compared with the Femto User Equipment (FUE)-assisted and Macro User Equipment (MUE)-assisted power control technique, the proposed technique offers a good tradeoff in reducing interference to macro users, while maintaining the quality of service (QoS) requirement of the femtocell users.
Highlights
The exponentially increasing demand for high data rate and capacity in mobile communications has created a real challenge for wireless communication network operators, as a large percentage of indoor users suffer from a poor quality of service (QoS) [1]
We used the closed access mode HeNB, one of the favorite access modes of domestic subscribers of femtocell services, where only authorized users have access to the services of the femtocell; the Macro User Equipment (MUE) in the vicinity of the femtocell has no access to the femtocell
The main aim of power controlling in the HeNB is to uphold the Femto User Equipment (FUE) coverage and identify potential downlink throughput, while mitigating the inter-cell interference (ICI) experienced by the nearby macro users
Summary
The exponentially increasing demand for high data rate and capacity in mobile communications has created a real challenge for wireless communication network operators, as a large percentage of indoor users suffer from a poor quality of service (QoS) [1]. The two-tier, macro–femto heterogeneous system, where the primary system is the macro base station (MBS called eNB) and the secondary system, represented by the user-installed femtocell (HeNB), ignore their mutual presence, while both systems work in a frequency reuse fashion [6] In such an operating scenario, the downlink (DL) transmission of HeNB causes inter-cell interference for the cell-edge macro user. The high downlink transmission power of the femtocell provides more coverage and good signal quality; at the same time, it creates terrific interference to other cell-edge users of the other femtocell or macrocell networks. The simulation results show that the ANS power control technique successfully decreases the cell-edge macro user’s interference and enhances the throughput performance, whilst optimizing the femtocell coverage and capacity.
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