초록 ▼

A private radio system within a serving cell of a cellular communications system periodically monitors the broadcast information transmitted on the control channels of the serving and surrounding cells. From this monitoring, all those carrier frequencies serving as control channels are derived for t

A private radio system within a serving cell of a cellular communications system periodically monitors the broadcast information transmitted on the control channels of the serving and surrounding cells. From this monitoring, all those carrier frequencies serving as control channels are derived for the cell areas around the serving cell and a control channel list constructed. The private radio system then carries out signal strength measurements on the downlink control channels, and orders the control channel list accordingly. Alternatively, a mobile station that is attached to a private radio system can perform the downlink measurements and forward the measurements to the private radio system. In either event, the private radio system selects a communication channel from the ordered list and derives, from the received signal strength values of the control channels, the transmit power level required to both overcome interference caused by more distant cellular base stations and, at the same time, not interfere with those stations.

대표청구항 ▼

[ What is claimed is:] [1.] A method for allocating a transmit power level for a communications channel for a private radio system within a serving cell of a cellular system, where said private radio system and said cellular system share frequencies, said method comprising the steps of:receiving, wi

[ What is claimed is:] [1.] A method for allocating a transmit power level for a communications channel for a private radio system within a serving cell of a cellular system, where said private radio system and said cellular system share frequencies, said method comprising the steps of:receiving, within said private radio system, downlink information from said serving cell and a plurality of cells surrounding said serving cell, said downlink information including a plurality of control channel frequencies for said serving and surrounding cells, forming a control channel list;measuring, within said private radio system, the signal strengths of said plurality of control channel frequencies within said control channel list;ordering said control channel frequencies within said control channel list according to the signal strength measurements, forming an ordered control channel list, said ordered list containing said control channel frequencies and the corresponding signal strength measurements thereof with the control channel frequency having the highest signal strength measurement at a top position within said ordered list and the control channel frequency having the lowest signal strength measurement at a bottom position within said ordered list;selecting said communications channel from said bottom position of said ordered control channel list; anddetermining said transmit power level for said communications channel from the corresponding signal strength measurement.