초록 ▼

A base station, a subscriber equipment, and a method for synchronizing the subscriber equipment with the transmission of the base station in a digital cellular radio network utilizing the CDMA multiple access method. In each cell of the network, at least one base station communicates with the subscr

A base station, a subscriber equipment, and a method for synchronizing the subscriber equipment with the transmission of the base station in a digital cellular radio network utilizing the CDMA multiple access method. In each cell of the network, at least one base station communicates with the subscriber equipment within its area, in which network the base station transmits a separate pilot channel provided with a predetermined spreading code. In order to facilitate the synchronization of the subscriber equipment, the base station transmits a data-modulated signal on the pilot channel.

대표청구항 ▼

A method for synchronizing each of a plurality of units of subscriber equipment with transmission of particular ones of a plurality of base stations, in a digital cellular radio network utilizing CDMA, and having, in each cell of a plurality of cells of said network, at least one base station, each

A method for synchronizing each of a plurality of units of subscriber equipment with transmission of particular ones of a plurality of base stations, in a digital cellular radio network utilizing CDMA, and having, in each cell of a plurality of cells of said network, at least one base station, each such base station having a respective coverage area and arranged to communicate with subscriber equipment within the respective said coverage area, each said base station being arranged for transmitting traffic for reception by subscriber equipment located within its respective said coverage area using a given frequency band and, for each subscriber equipment, a respective first spreading code which is unique to each respective subscriber equipment, (a) each said base station transmitting a respective data-modulated pilot signal for reception by all subscriber equipment located within its respective said coverage area, using said given frequency band and a respective second spreading code which is different from each said first spreading code; and (b) each subscriber equipment automatically exploiting at least one said pilot signal for at least one of: (i) determining which one of said base stations to become presently served by, as a presently serving base station, on the basis of relative signal strength and selecting that base station; and (ii) achieving code and frame synchronization with the presently serving base station selected in step (b) (i); step (a) including data-modulating each said pilot signal to provide a respective data-modulated pilot signal, by inverting at least one symbol in at least one characteristic location in at least certain instances of transmitting of each said data-modulated pilot signal using the respective said second spreading code.