Abstract
The implementation of small base stations, known as femtocells, can significantly improve network performance. Nevertheless, the inherent problem of the femtocells consists in significant amount of initiated handovers that could decrease a quality of service. This issue is further emphasized if the femtocells and the macrocells utilize different access technology, as vertical handover between them introduces longer interruption in the communication. Still, performing vertical handover can be profitable if other technology can offer higher quality of service. This paper contemplates three vertical handover decision strategies formerly considered for networks without femtocells and analyzes their performance if the femtocells are deployed. Since these strategies either introduce long interruption duration, high degradation of quality of service, or both, we also propose new vertical handover strategy considering femtocells features, such as small coverage and their vast deployment. Analytical evaluations and simulation results indicate that the proposed strategy can guarantee the highest quality of service for all considered performance metrics. DOI: http://dx.doi.org/10.5755/j01.eee.20.2.3517
Highlights
In the generation wireless networks, the users may move within heterogeneous networks and to perform Vertical Handover (VHO) [1]
The Macro Base Stations (MBSs) is not able to serve requirements of the UE, which results in a Quality of Service (QoS) degradation, since handover to the Femto Access Points (FAPs) is performed only according to the current signal quality
While the performance of Conventional Strategy III (CS-III) and Proposed Strategy (PS) is notable improved for Scenario II, the results achieved by Conventional Strategy-I (CS-I) and Conventional Strategy II (CS-II) are significantly worsened for higher values of ΔHM
Summary
In the generation wireless networks, the users may move within heterogeneous networks and to perform Vertical Handover (VHO) [1]. The main reason why existing schemes proposed for VHO without the FAPs are not applicable here is that high amount of the FAPs is supposed to be deployed in near future and significant amount of VHOs can, be generated. This paper focuses on handover decision if the Macro Base Stations (MBSs) and the FAPs utilize different access technology. VHO from the MBS to the FAP is not performed even if the latter can offer higher throughput since the user’s demands are still satisfied By this approach, the duration of the service interruption can be minimized (reduction of VHOs) whilst the QoS could be fulfilled. The section summarizes the related work dealing with handover decision strategies in the networks with and without the FAPs. The Section III describes individual VHO decision strategies contemplated in this paper.
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