Patent ID: 6301230
Filing Date: 2001-10-09
Classification: H04B,H04W,Y02D

Abstract:
A radio paging system comprising:a plurality of base stations which transmit a paging signal sequence, each base station comprising means for inserting a base station ID signal, which differs from each base station, in the paging signal sequence, and at least one of the plurality of base stations comprising a response receiver; anda radio pager which receives a received signal containing at least part of the paging signal sequence transmitted from the plurality of base stations, the radio pager comprising a response transmitter that sends back a response signal addressed to itself contained in the received signal, the response transmitter comprising a direct sequence modulator to modulate the response signal to the base station, the direct sequence modulator using a code obtained from the base station ID signal to impose a spreading code onto the response signal for identifying the response signal from the radio pager to the base station of the plurality of base stations to which the response signal belongs, whereinthe response receiver further comprises:a modulated signal receiver that receives the direct sequence modulated response signal from the radio pager and obtains the spreading code of the base station to which it belongs and the address of the paged radio pager; anda storage element storing pre-registered base station ID signals transmitted from other base stations, wherein the response receiver receives response signals associated with base station ID signals from the other base stations.