Method and a device for gaining and maintaining control of the traffic from a radio base station in a cellular telephony system

摘要

A method for letting a temporary radio base station (RBS, 140) gain and maintain control of the traffic of a targeted RBS (120) in a system (100), where RBS's transmit an identity signal and a list of candidate frequencies for use by user terminals when switching RBS. The temporary RBS (140) is positioned in or adjacent to the targeted RBS (120), and transmits on a frequency in the candidate list of the targeted RBS (120). The transmissions are at such a power level that the traffic of the targeted RBS (120) is transferred to the temporary RBS (140). The temporary RBS transmits the identity signal the RBS whose frequency the temporary RBS transmits on, and transmits a list of candidate frequencies such that user terminals whose traffic has been transferred to the temporary RBS cannot find signals with sufficient strength on any of the candidate frequencies.

主权项

1. A method for letting an extra base station gain and maintain control of traffic to and from a targeted radio base station (RBS) in a wireless cellular telecommunications system, said system comprising a plurality of RBS's for routing traffic to and from user terminals in the system, each RBS controlling the traffic to and from a certain cell within the system, where at least a number of said plurality of RBS's in the system each transmits an identity signal and a list of candidate frequencies for use by user terminals when switching RBS, the method comprising:
positioning said extra base station in or adjacent to the cell of the targeted RBS, the extra base station comprising a temporary base station which is only temporarily a part of, but otherwise is separate from the wireless cellular telecommunications system, programming the extra base station to transmit on one of the frequencies in the candidate list broadcast by the targeted RBS, making the transmissions of the extra base station with such a power level that traffic to and from user terminals in the cell of the targeted RBS will be transferred to the extra base station, programming the extra base station to transmit an identity signal which is the same as that of the RBS whose frequency the extra base station transmits on, programming said extra base station to transmit a list of candidate frequencies, the list being such that user terminals whose traffic has been transferred to the extra base station cannot find signals with a strength at or above a pre-defined level for a certain pre-defined amount of time on any of the candidate frequencies in the vicinity of the cell of the targeted RBS.