초록 ▼

During a "make before you break" handoff performed within a CDMA communications system, duplicate downlink communications are generated and routed through different base stations for delivery to the mobile station. At the mobile station, the duplicate signals are received and the frame sequence numb

During a "make before you break" handoff performed within a CDMA communications system, duplicate downlink communications are generated and routed through different base stations for delivery to the mobile station. At the mobile station, the duplicate signals are received and the frame sequence numbers of the substantially simultaneously received frames therein are compared. If the sequence numbers do not match, the duplicate signals are identified as not being synchronously received by the mobile station. In response thereto, the mobile station signals the communications network on the uplink with a timing adjustment message, and appropriate timing modifications are made with respect to the transmission of the duplicate signals in order to provide for substantially synchronous reception. Diversity combination and decoding are then performed on the received signals. Alternatively, the mobile station buffers the earlier arriving signal and waits for the later arrival of the sequence number matching frame of the duplicate signal before engaging in diversity combining and decoding of the received signals.

대표청구항 ▼

[ What is claimed is:] [1.] A method for mobile station processing of transmitted duplicate base station communications, each communication including a plurality of frames identified by frame sequence numbers, comprising the steps of:receiving the duplicate base station communications;comparing fram

[ What is claimed is:] [1.] A method for mobile station processing of transmitted duplicate base station communications, each communication including a plurality of frames identified by frame sequence numbers, comprising the steps of:receiving the duplicate base station communications;comparing frame sequence numbers for substantially simultaneously received frames within the received duplicate base station communications;processing the substantially simultaneously received frames if the frame sequence numbers match; andgenerating a signal for transmission from the mobile station to an origination source of the duplicate base station communications if the frame sequence numbers do not match, the signal identifying non-synchronous reception of the frames within the duplicate base station communications and requesting a timing adjustment be made to the duplicate base station communication transmissions to provide for substantially synchronous reception of frame sequence number matching frames within the received duplicate base station communications at the mobile station.