Patent ID: 8576797

Claim:
A method for controlling a handover operation of a base station in a wireless communication system, the method comprising: determining whether a length of a fourth time interval taken for the terminal to synchronize with a target base station exceeds a fourth threshold time; if the length of the fourth time interval exceeds the fourth threshold time, determining to delay a time point to trigger the handover; and changing at least one handover parameter to delay the time point to trigger the handover; recording times for transmitting and receiving messages related to the handover and times of events taking place every time the terminal performs the handover; and aggregating handover history information comprising at least one of a handover success rate, a handover failure rate, a frequency of Radio Link Failure (RLF) due to a late handover, a frequency of the RLF due to an early handover, a frequency of RLF due to handover to a wrong cell, a frequency of an unnecessary handover, a frequency of the handover within a certain time after connection setup, an average value of a first time (t 1 ), an average value of a second time (t 2 ), an average value of a third time (t 3 ), an average value of [fourth time (t 4 ), and an average value of a fifth time (t 5 ) by analyzing the recorded information.