Cdma mobile communication method, system, and mobile station equipment

Claim 2

The CDMA mobile communication method as claimed in claim 1, characterized in that during the hand-off operation between said first base station and said second base station, said first base station comprises a step for transmitting said user data in the first time and discontinuing the transmission in the second time, said second base station comprises a step for transmitting said user data in the second time and discontinuing the transmission in the first time, said mobile station comprises a step for receiving and demodulating a signal from said first base station in the first time, changing over the frequency of a receiver to the radio frequency of said second base station in the second time to receive and demodulate the signal from said second base station, and reproducing said user data by combining the signal from said first base station and the signal from said second base station.

Claim 3

The CDMA mobile communication method as claimed in claim 2, characterized in that during the hand-off operation, said mobile station comprises a step for transmitting said user data to said first base station at a first radio frequency in a third time in which said user data is to be transmitted, and transmitting said user data to said second base station at a second radio frequency in a fourth time in which said error correction check bits are to be transmitted, said first base station comprises a step for demodulating said user data received in the third time, said second base station comprises a step for demodulating said user data received in the fourth time, and an upper level station of said first base station and said second base station comprises a step for reproducing said user data by combining these demodulated signals.

Claim 4

The CDMA mobile communication method as claimed in claim 1, characterized in that during the hand-off operation period between said first base station and said second base station, said first base station comprises a step for transmitting said user data in the first time and discontinuing the transmission in the second time; said second base station comprises a step for transmitting said error correction check bits in the second time and discontinuing the transmission in the first time; said mobile station comprises a step for receiving and demodulating the signal from said first base station in the first time, changing over the frequency of said receiver to the radio frequency of said second base station in the second time to receive and demodulate the signal from said second base station, and reproducing said user data by using said user data from said first base station and error correction check bits from said second base station.

Claim 5

The CDMA mobile communication method as claimed in claim 4, characterized in that during the hand-off operation, said mobile station comprises a step for transmitting said user data at the first radio frequency to said first base station in the third time in which said user data is to be transmitted, and transmitting said error correction check bits at the second radio frequency to said second base station in the fourth time in which said error correction check bits are to be transmitted; said first base station comprises a step for demodulating said user data received in the third time; said second base station comprises a step for demodulating said error correction check bits received in the fourth time; and said upper level station of said first base station and said second base station comprises a step for reproducing said user data by error correction decoding using these demodulated signals.

Claim 6

A CDMA mobile communication method, in which a first base station, after a user data is error correction encoded, transmits a narrow-band modulated signal obtained by primary modulation using multilevel modulation of said user data and an error correction check bits, followed by secondary modulation by a spreading code to a wideband signal, and a mobile station makes conversion of said wideband signal to said narrow-band modulated signal, followed by demodulation and error correction decoding, to reproduce said user data; wherein during a reception level monitoring period for said mobile station to monitor the reception level of the signal from a second base station differing in frequency from said first base station: said first base station comprises a step for making a second time for discontinuing transmission by transmitting said user data and said error correction check bits in the first time using an increased modulated level of said multilevel modulation; said mobile station comprises a step for demodulating the received signal with an increased modulated level of said multilevel modulation and making error correction decoding to reproduce said user data in the first time, changing over the reception frequency to the radio frequency of said second base station to monitor the reception level of said second base station in the second time.

Claim 7

The CDMA mobile communication method as claimed in claim 6, characterized in that during the hand-off operation period between said first base station and said second base station, said first base station comprises a step for transmitting said user data and its error correction check bits in the first time; said second base station comprises a step for transmitting said user data and its error correction check bits in the second time; said mobile station comprises a step for receiving said user data and said error correction check bits from said first base station in the first time, changing over the reception frequency to the radio frequency of said second base station to receive said user data and said error correction check bits in the second time, and reproducing said user data by combining the signal from said first base station and the signal from said second base station and by performing error correction.

Claim 8

A CDMA mobile communication system, comprising a first base station which, after a user data is error correction encoded, transmits a narrow-band modulated signal obtained by primary modulation of said user data and an error correction check bits, followed by secondary modulation by a spreading code to a wideband signal, and a mobile station for making conversion of said wideband signal to said narrow-band modulated signal, followed by demodulation and error correction decoding, to reproduce said user data; characterized in that said mobile station comprises: a demodulator for demodulating said user data in a first time of receiving said user data transmitted from said first base station; an error correction decoder which discontinues the error correction decoding in a second time of receiving said error correction check bits and outputs said user data which are not error correction decoded; frequency change-over means for changing over the reception frequency to a radio frequency of said second base station differing in used frequency from said first base station in the second time; and a received level measuring unit for monitoring the reception level of the signal from said second base station.

Claim 9

The CDMA mobile communication system as claimed in claim 8 further characterized by comprising a upper level station for instructing hand-off between said first base station and said second base station, wherein said first base station comprises first control means for transmitting said user data in the first time and discontinuing the transmission in the second time according to the hand-off instruction from said upper level station; said second base station comprises second control means for transmitting said user data in the second time and discontinuing the transmission in the first time according to the hand-off instruction; and said mobile station comprises receiving frequency switching means for tuning the frequency of a receiver to one of the transmission frequency of said first base station and the transmission frequency of said second base station, and a demodulator for receiving and demodulating the signal from said first base station in the first time and receiving and demodulating the signal from said second base station in the second time for combining the signal from said first base station and the signal from said second base station to reproduce said user data.

Claim 10

The CDMA mobile communication system as claimed in claim 9, characterized in that the mobile station comprises transmission frequency change-over means for changing over the transmission frequency of a transmitter to one of the reception frequency of said first base station and the reception frequency of said second base station, and transmission means for, during the hand-off period, transmitting user data at the reception frequency of said first base station in the third time in which said user data is to be transmitted and transmitting said user data at the reception frequency of said second base station in the fourth time in which said error correction check bits are to be transmitted; said first base station comprises a first demodulator for demodulating said user data received in the third time; said second base station comprises a second demodulator for demodulating said user data received in the fourth time; and said upper level station comprises means for reproducing said user data by combining the demodulated signals demodulated by said individual demodulators.

Claim 11

The CDMA mobile communication system as claimed in claim 8 further characterized by comprising an upper level station for instructing hand-off between said first base station and said second base station, wherein said first base station comprises first control means for transmitting said user data in the first time and discontinuing the transmission in the second time according to the hand-off instruction from said upper level station; said second base station comprises second control means for transmitting said error correction check bits in the second time and discontinuing the transmission in the first time according to the hand-off instruction; said mobile station comprises receiving frequency switching means for tuning the frequency of the receiver to one of the transmission frequency of said first base station and the transmission frequency of said second base station, and a demodulator for receiving and demodulating the signal from said first base station in the first time and receiving and demodulating the signal from said second base station in the second time to reproduce said user data using said user data from said first base station and said error correction check bits from said second base station.

Claim 12

The CDMA mobile communication system as claimed in claim 11, characterized in that the mobile station comprises transmission frequency change-over means for changing over the transmission frequency of a transmitter to one of the reception frequency of said first base station and the reception frequency of said second base station, and transmission means for, during the hand-off period, transmitting user data at the reception frequency of said first base station in the third time in which said user data is to be transmitted and transmitting said error correction check bits at the reception frequency of said second base station in the fourth time in which said error correction check bits are to be transmitted; said first base station comprises a demodulator for demodulating said user data received in the third time; said second base station comprises a demodulator for demodulating said error correction check bits received in the fourth time; and said upper level station comprises means for making error correction decoding using the demodulated signals outputted from said individual demodulators to reproduce said user data.

Claim 13

A CDMA mobile communication system, comprising a first base station which, after a user data is error correction encoded, transmits a narrow-band modulated signal obtained by primary modulation with multivalue modulation of said user data and an error correction check bits, followed by secondary modulation by a spreading code to a wideband signal, and a mobile station for making conversion of said wideband signal to said narrow-band modulated signal, followed by demodulation and error correction decoding, to reproduce said user data; wherein said first base station comprises a first modulation level control unit for varying the modulation level of said multilevel modulation of said user data and said error correction check bits, and means for making a second time for discontinuing transmission by transmitting with an increased modulation level in the first time during a reception level monitoring period for said mobile station to monitor the reception level of the signal from a second base station differing in frequency from said first base station; and said mobile station comprises receiving frequency switching means for tuning the frequency of a receiver to one of the transmission frequency of said first base station and the transmission frequency of said second base station, a second modulation level control unit for changing the modulation level of said multilevel modulation, and a demodulator for demodulating the reception signal with an increased modulation level and making error correction decoding to reproduce said user data, and a received level measuring unit for changing over the reception frequency to the transmission frequency of said second base station to monitor the reception level of said second base station.

Claim 14

The CDMA mobile communication system as claimed in claim 13, further characterized by comprising an upper level station for instructing hand-off between said first base station and said second base station, wherein said first base station comprises first transmission means for transmitting said user data in the first time and its error correction check bits in the first time according to the hand-off instruction from said upper level station; said second base station comprises second transmission means for transmitting said user data and its error correction check bits in the second time according to the hand-off instruction; and said mobile station comprises means for receiving said user data and said error correction check bits from said first base station in the first time, changing over the reception frequency to the transmission frequency of said second base station in the second time to receive said user data and said error correction check bits, and combining the signal from said first base station and the signal from said second base station to reproduce said user data.

Claim 15

A mobile station, comprising a first base station which, after a user data is error correction encoded, transmits a narrow-band modulated signal obtained by primary modulation of said user data and an error correction check bits, followed by secondary modulation by a spreading code to a wideband signal, and a mobile station for making conversion of said wideband signal to said narrow-band modulated signal, followed by demodulation and error correction decoding, to reproduce said user data; wherein a receiver of said mobile station comprises: a demodulator for demodulating said user data in a first time of receiving said user data transmitted from said first base station; an error correction decoder which discontinues said error correction decoding in the second time of receiving said error correction check bits and outputs said user data which is not error correction decoded; a frequency switching unit for changing over the reception frequency to a radio frequency of said second base station differing in used frequency from said first base station in the second time; and a received level measuring unit for monitoring the reception level of said second base station.

Claim 16

The mobile station as claimed in claim 15, characterized in that said receiver of said mobile station comprising: a reception frequency switching unit for tuning the reception frequency of said receiver to one of the transmission frequency of said first base station and the transmission frequency of said second base station, and a demodulator which, during the hand-off period between said first base station and said second base station, receives and demodulates the signal from said first base station in the first time, receives and demodulates the signal from said second base station in the second time for combining the signal from said first base station and the signal from said second base station to reproduce said user data; and said transmitter of said mobile station comprises: transmission frequency change-over means for tuning the transmission frequency to one of the reception frequency of said first base station and the reception frequency of said second base station; and transmission means for, during the hand-off period, transmitting user data at the reception frequency of said first base station in the third time in which said user data is to be transmitted and transmitting said user data at the reception frequency of said second base station in the fourth time in which said error correction check bits are to be transmitted; and wherein said first base station comprises a step for demodulating said user data received in the third time; the second base station comprises a step for demodulating said user data received in the fourth time; and a upper level station of said first base station and said second base station comprises a step for combining these demodulated signals to reproduce said user data.

Claim 17

A mobile station in CDMA mobile system, comprising a first base station which, after a user data is error correction encoded, transmits a narrow-band modulated signal obtained by primary modulation with multilevel modulation of said user data and an error correction check bits, followed by secondary modulation by a spreading code to a wideband signal, and said mobile station making conversion of said wideband signal to said narrow-band modulated signal, followed by demodulation and error correction decoding, to reproduce said user data, said first base station transmitting said user data and said error correction check bits in a first time with an increased multiple value of said multivalue modulation to make a second time for discontinuing transmission, wherein a receiver of said mobile station comprises: a modulated level switcher for increasing the modulation level of said multilevel modulation in the first time during reception level monitoring period for monitoring the reception level of the signal from a second base station differing from said first base station; means for reproducing said user data which, during the first time, demodulates said user data and error correction check bits, and error correction decodes said user data, a reception frequency switching unit for tuning the reception frequency of said receiver to one of the transmission frequency of said first base station and the transmission frequency of said second base station; and a received level measuring unit for monitoring the reception level of said second base station in the second time.

Claim 18

The mobile station as claimed in claim 17, characterized in that said reception frequency switching unit of said receiver of said mobile station, during the hand-off period between said first base station and said second base station, changes over the reception frequency to the transmission frequency of said first base station in the first time, and to the transmission frequency of said second base station in the second time, and said means for combining the signal from said first base station and the signal from said second base station to reproduce said user data.