Apparatus and method for handover optimization in broadband wireless communication system
AssigneeSamsung Electronics Co., Ltd.
InventorsByoung-Gi Jang, Jung-Hee Han, Mi-Sun Do, Young-Jun Park, Jung-Min So
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Abstract
A method and apparatus optimize handover optimization in a broadband wireless communication system. Operations of a base station includes determining whether at least one of a plurality of time intervals included in a total time taken by handover, exceeds a threshold time. Whether to advance or delay a handover point is determined based on which at least one of the time interval exceeds the threshold time. And at least one handover parameter is changed to advance or delay the handover point.
Claims21
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 (t1), an average value of a second time (t2), an average value of a third time (t3), an average value of [fourth time (t4), and an average value of a fifth time (t5) by analyzing the recorded information.
An apparatus of a base station in a wireless communication system, the apparatus comprising:
- a determiner configured to determine whether a length of a fourth time interval taken for a terminal to synchronize with a target base station exceeds a fourth threshold time;
- and
- a manager configured to, if the length of the fourth time interval exceeds the fourth threshold time, determine to delay a time point to trigger the handover, and change at least one handover parameter to delay the time point to trigger the handover point;
- a storage part configured to record times for transmitting and receiving messages related to the handover and times of events taking place every time the terminal performs the handover, and
- aggregate 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 RLF due to an early handover, a frequency of RLF due to the handover to a wrong cell, a frequency of an unnecessary handover, a frequency of the handover within a certain time after the connection setup, an average value of a first time (t1), an average value of a second time (t2), an average value of a third time (t3), an average value of a fourth time (t4), and an average value of a fifth time (t5), by analyzing the recorded information.
Dependencies are inferred from the claim text.