Handover management apparatus, base station, and handover management method

摘要

In femtocell operation, when a wireless communication terminal whose ID is not registered (ID unregistered terminal) has entered a femtocell's area, the disclosed invention prevents interference between the femtocell and the ID unregistered terminal and interference between the ID unregistered terminal and an ID registered radio communication terminal and prevents a decrease in the throughput of the femtocell and these terminals. In a radio coverage area formed by a radio base station, if a drop of received power from a radio communication terminal occurs and the frequency of reporting the ID of the base station now communicating with the terminal has become less than a given value, it is decided that the terminal is located indoors. For the terminal, if its handover to a femtocell was found to be rejected by MME, the terminal is temporarily permitted to be handed over to a femtocell.

主权项

1. A handover management apparatus in a network system including a first base station, a second base station whose coverage cell overlaps with a cell of the first base station, and a management device that manages permission/rejection information indicating whether or not a handover to a second base station is permitted, the handover management apparatus comprising:
a connection information management unit that acquires, from said first base station, received power from a radio terminal at the first base station at given intervals; a handover information management unit that acquires, from the management device, the identifier of a radio terminal rejected to be handed over to a second base station; and a decision unit to permit handover that finds a radio terminal fulfilling a first condition that the received power from the radio terminal acquired by said connection information management unit is not more than a predetermined first threshold and a state in which said received power is not more than said first threshold continues for a predetermined period of time and transmits to said management device a request to temporarily permit a handover of the thus found radio terminal to a second base station; wherein said decision unit to permit handover finds a radio terminal fulfilling said first condition and fulfilling a second condition that a handover of the radio terminal to a second base station was rejected, based on the identifier of the radio terminal acquired by said handover information management unit; wherein said connection information management unit collects the frequency of reporting a base station identifier, reported from a radio terminal that received radio waves from base stations including the first and second base stations; and wherein said decision unit to permit handover finds a radio terminal fulfilling said first and second conditions and fulfilling a third condition that the frequency of reporting the identifier of the first base station now communicating with the radio terminal is not more than a predetermined second threshold.