Self-Organized handover parameter configuration for LTE

Two main parameters influence the performance of Handover (HO) in Cellular systems, the Hysteresis (Hys) and the Time-To-Trigger (TTT). In Self-Organized Networks (SON) as has been proposed for LTE, the SON methods configure and optimize these two parameters to optimize HO performance. In this paper, we model the LTE HO procedure and propose an algorithm for self-configuration of the two HO trigger parameters. We model HO performance in terms of HO rate, the Ping-Pong rate, and the Radio Link Failure rate. We observe that the optimum trigger combination can occur anywhere within the parameter space depending on the relative importance given to each of the performance metrics as implemented using a weighting function. This motivates our HO configuration algorithm that searches for optimum parameter values by undertaking optimization one parameter at a time.