Patent ID: 6356579
Filing Date: 2002-03-12
Classification: H04W

Abstract:
A paging system having one or more base stations for transmitting to a radio zone a paging signal sequence, and one or more pagers for receiving at least one paging signal of the paging signal sequence transmitted from the one or more base stations,said one or more pagers each comprising: response means for direct sequence spread spectrum modulating, when the paging signal sequence received includes a paging signal addressed to the pager, a response upward signal acknowledging reception of the paging signal, and for transmitting the modulated response upward signal; and initiative transmission means for direct sequence spread spectrum modulating a pager initiative upward signal by using a second spreading code different from a first spreading code used by said response means, and for transmitting the modulated pager initiative upward signal, said pager initiative upward signal being an upward signal other than said response upward signal; and said one or more base stations each comprising: receiving means for receiving both of said modulated response upward signal from said response means and said modulated pager initiative upward signal from said initiative transmission means.