Velocity-Aware Handover Management in Two-Tier Cellular Networks

Abstract
While network densification is considered an important solution to cater the ever-increasing capacity demand, its effect on the handover (HO) rate is overlooked. In dense 5G networks, HO delays may neutralize or even negate the gains offered by network densification. Hence, user mobility imposes a nontrivial challenge to harvest capacity gains via network densification. In this paper, we propose a velocity-aware HO management scheme for two-tier downlink cellular network to mitigate the HO effect on the foreseen densification throughput gains. The proposed HO scheme sacrifices the best base station (BS) connectivity, by skipping HO to some BSs along the user trajectory, to maintain longer connection durations and reduce HO rates. Furthermore, the proposed scheme enables cooperative BS service and strongest interference cancellation to compensate for skipping the best connectivity. To this end, we consider different HO skipping scenarios and develop a velocity-aware mathematical model, via stochastic geometry, to quantify the performance of the proposed HO schemes in terms of the coverage probability and user throughput. The results highlight the HO rate problem in dense cellular environments and show the importance of the proposed HO schemes. Finally, the value of BS cooperation along with handover skipping is quantified for different user mobility profiles.

Citation
Arshad R, ElSawy H, Sorour S, Al-Naffouri TY, Alouini M-S (2017) Velocity-Aware Handover Management in Two-Tier Cellular Networks. IEEE Transactions on Wireless Communications 16: 1851–1867. Available: http://dx.doi.org/10.1109/TWC.2017.2655517.

Acknowledgements
This work was supported by the KAUST-KFUPM joint research initiative. The associate editor coordinating the review of this paper and approving it for publication was P. S. Rossi.

Publisher
Institute of Electrical and Electronics Engineers (IEEE)

Journal
IEEE Transactions on Wireless Communications

DOI
10.1109/TWC.2017.2655517

arXiv
1609.02411

Additional Links
http://ieeexplore.ieee.org/document/7827020/

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