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Handover method in mobile communications system
| Details |
Inventors: Taketsugu, Masanori;
Assignee: NEC Corporation (Tokyo, JP)
Primary Examiner: Eisenzopf; Reinhard J.
Assistant Examiner: Banks-Harold; Marsha D.
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak & Seas
The handover method disclosed relates to a mobile communication system in which, based on the number of handovers in mobile units, the size of the radio zone to be assigned to a mobile unit is selected. The mobile switching center measures the number of handovers in each of the mobile units engaging in communication and, during the handover in the mobile unit, the handover target radio zone is assigned based on the measured value of the number of handovers. The target handover of mobile units is determined by the target determination controller based the number of handovers memorized in the handover number recorder. The assignment of the appropriate size radio zone prevents an excess load on the mobile switching center and the capacity to accommodate subscribers in the mobile communication system is enhanced. |
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DETAILED DESCRIPTION An object of the invention, therefore, is to overcome the problems existing in the prior art and to provide an improved handover method in a mobile communication system in which, based on the number of handovers in mobile units, the size of the radio zone to be assigned to a mobile unit is selected and the assignment of the appropriate size radio zone prevents an excess load on the mobile switching center, whereby the capacity to accommodate subscribers in the mobile communication system is enhanced.
According to first aspect of the invention there is provided a handover method in a mobile communication system which comprises a plurality of radio base stations for communication with a plurality of mobile units using radio channels, the plurality of radio base stations covering a plurality of radio zones whose sizes are different from one another, end a mobile switching center for controlling the plurality of radio base stations, the radio zones having different sizes being overlapped thereby constituting a multi-radio zone environment, the handover method comprising the steps of: measuring, by the mobile switching center, the number of handovers in each of the mobile units engaging in communication; and assigning, during the handover in the mobile unit, a handover target radio zone based on the measured value of the number of handovers.
In the first aspect of the invention, the mobile switching center recognizes a radio base station, with which the mobile unit in communication has established radio connection, and a communication channel.
In this mobile switching center, the number of handovers is calculated and, if the number of handovers i$ higher than its threshold value, the mobile unit is allowed to make the handover to a radio zone whose size is larger than the current radio zone so that it is possible to control the handover processing at the mobile switching center.
Thus, it is possible to realize the efficient operation of handovers corresponding to the handover processing capability of the mobile exchanger
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