CoMP Handover Probability Analysis with Different Handover Schemes in Ultra-Dense Networks

This paper conducts handover probability analysis in Coordinated multipoint (CoMP) based ultra-dense networks (UDNs) where $n$ access points (APs) jointly serve the user. To thoroughly investigate the effect of mobility on handover probability, we compare several handover schemes of CoMP coordinating set (CCS) handover and serving cell handover. From the perspective of CCS handover, three schemes are considered including ``best $n$', ``half best $n$'' and ``none of the best $n$''. Meanwhile, from the perspective of the serving cell handover, this paper discusses two schemes: ``not the best one'' and ``not any of the best $n$''. With stochastic geometry methods, theoretical expressions of CoMP handover probability with different schemes are derived. Further, simulation results illustrate that scheme ``best $n$'' provides an upper bound while scheme ``none of the best $n$'' exhibits as a lower bound of CoMP handover probability and other schemes lie between them. To sum up, such analysis may provide a good performance reference for the design of CoMP handover.