초록 ▼

A mobile station is provided which does not cause a reduction in the speech transmission capacity. Branches receive radio signals from base stations and operate independently of one another. A branch operation control section controls the operation of the individual branches to detect a destination-

A mobile station is provided which does not cause a reduction in the speech transmission capacity. Branches receive radio signals from base stations and operate independently of one another. A branch operation control section controls the operation of the individual branches to detect a destination-side base station based on the reception levels of signals from surrounding base stations, to cause part of the branches to establish synchronization of spreading code and carrier frequency with respect to the destination-side base station while causing the other part of the branches to maintain communication with a departure-side base station after the destination-side base station is detected, and to cut off the communication with the departure-side base station after the synchronization is established.

대표청구항 ▼

[ What is claimed is:] [1.] A mobile station for performing communication in a cell environment, where different carrier frequencies are used in adjacent cells, comprising:first and second branches which operate independently of each other to receive radio signals from base stations and demodulate t

[ What is claimed is:] [1.] A mobile station for performing communication in a cell environment, where different carrier frequencies are used in adjacent cells, comprising:first and second branches which operate independently of each other to receive radio signals from base stations and demodulate the received signals;a diversity combining section which performs diversity combining of the two demodulated signals supplied by said first and second branches;a selecting section which selects a signal from among the two demodulated signals supplied by said first and second branches and the diversity combined signal supplied by said diversity combining section;a baseband signal processing section which reproduces a baseband signal from the signal selected by said selecting section and obtains information about a destination-side base station from the reproduced baseband signal; anda branch operation control section which controls operation of said first and second branches and said selecting section, including;means for detecting the destination-side base station based on reception levels of the radio signals received from surrounding base stations,means, responsive to the detection of the destination-side base station, for causing said second branch to establish synchronization of spreading code and carrier frequency with respect to the destination-side base station, according to the information obtained by said baseband signal processing section, while using said first branch to maintain communication with a departure-side base station, andmeans for cutting off the communication with the departure-side base station after the synchronization is established between the destination-side base station and said second branch, and resuming the communication with the destination-side base station by directing said selecting section to select the diversity combined signal so as to perform diversity reception.