A Handover Decision Strategy with a Novel Modified Load-Based Adaptive Hysteresis Adjustment in 3GPP LTE System

Doo-Won LEE  Gye-Tae GIL  Dong-Hoi KIM  

IEICE TRANSACTIONS on Information and Systems   Vol.E94-D    No.6    pp.1130-1136
Publication Date: 2011/06/01
Online ISSN: 1745-1361
DOI: 10.1587/transinf.E94.D.1130
Print ISSN: 0916-8532
Type of Manuscript: Special Section PAPER (Special Section on Emerging Technologies of Ubiquitous Computing Systems)
Handover decision strategy,  adaptive handover hysteresis,  hybrid scheme,  load balancing,  handover drop rate,  

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This paper introduces a hard handover strategy with a novel adaptive hysteresis adjustment that is needed to reduce handover drop rate in 3GPP long term evolution (LTE). First of all, we adopt a Hybrid handover scheme considering both the received signal strength (RSS) and the load information of the adjacent evolved Node Bs (eNBs) as a factor for deciding the target eNB. The Hybrid scheme causes the load status between the adjacent eNBs to be largely similar. Then, we propose a modified load-based adaptive hysteresis scheme to find a suitable handover hysteresis value utilizing the feature of the small load difference between the target and serving eNBs obtained from the result of the Hybrid scheme. As a result, through the proposed modified load-based adaptive hysteresis scheme, the best target cell is very well selected according to the dynamically changing communication environments. The simulation results show that the proposed scheme provides good performance in terms of handover drop rate.

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