초록 ▼

A traffic control method, a mobile station device and a base station device for mobile data communications that can realize improvement of communication quality and effective utilization of radio frequencies used in a mobile communication system using spread signals such as CDMA are disclosed. In a

A traffic control method, a mobile station device and a base station device for mobile data communications that can realize improvement of communication quality and effective utilization of radio frequencies used in a mobile communication system using spread signals such as CDMA are disclosed. In a mobile communication system of a scheme using spread signals including CDMA, where two types of communication channels including a common channel and a plurality of individual channels are provided such that the common channel is set to be used by a plurality of users together and each individual channel is set to be used exclusively by one user, a communication using the common channel and the individual channel is carried out between a mobile radio terminal and a radio base station, and an admission judgement for a shift from the common channel to the individual channel is carried out at the radio base station or the mobile radio terminal, when a communication traffic at the mobile radio terminal is shifting from a sparse state to a dense state during the communication.

대표청구항 ▼

The invention claimed is: 1. A traffic control method for mobile data communications of a radio base station in a mobile communication system of a scheme using spread signals including CDMA, where two types of communication channels including a common channel and a plurality of individual channels

The invention claimed is: 1. A traffic control method for mobile data communications of a radio base station in a mobile communication system of a scheme using spread signals including CDMA, where two types of communication channels including a common channel and a plurality of individual channels are provided such that the common channel is set to be used by a plurality of users together and each individual channel is set to be used exclusively by one user, comprising: carrying out a communication using the common channel, between a mobile radio terminal and said radio base station; receiving at the radio base station an allocation request from the mobile radio terminal after the mobile radio terminal has detected an increase or a decrease of data traffic during the communication; measuring, at the radio base station, an uplink reception interference level and a downlink transmission power level, and relaying the uplink reception interference level and the downlink transmission power level, along with respective uplink and downlink thresholds, to the mobile radio terminal; and shifting from the communication using the common channel to the communication using the individual channel between the mobile radio terminal and the radio base station, when the mobile radio terminal indicates that the uplink reception interference level and the downlink transmission power level are not greater than the respective uplink and downlink thresholds. 2. The traffic control method in mobile data communications as described in claim 1, characterized in that, when an admission of the shift is not possible as a result of the admission judgment for the shift from the common channel to the individual channel so that the communication is to be kept on the common channel, the radio base station and/or the mobile radio terminal are controlled such that data transmission is not carried out for a prescribed period of time or data transmission is carried out within a prescribed frequency, with regard to the communication. 3. The traffic control method in mobile data communications as described in claim 2, characterized in that, when an admission of the shift is not possible as a result of the admission judgment for the shift from the common channel to the individual channel so that the communication is to be kept on the common channel, and the shift from the common channel to the individual channel is to be attempted again after controlling the radio base station and/or the mobile radio terminal such that data transmission is not carried out for the prescribed period of time or data transmission is carried out within the prescribed frequency with regard to the communication, a timing for restarting an individual channel set up operation is controlled to be different from other mobile radio terminals. 4. The traffic control method in mobile data communications as described in claim 3, characterized in that the timing for restarting the individual channel set up operation is determined according to a random number. 5. A radio base station device in a mobile communication system of a scheme using spread signals including CDMA, where two types of communication channels including a common channel and a plurality of individual channels are provided such that the common channel is set to be used by a plurality of users together and each individual channel is set to be used exclusively by one user, the radio base station comprising: a communication unit configured to carry out a communication using the common channel with a mobile radio terminal and to receive an allocation request from the mobile radio terminal after the mobile radio terminal has detected an increase or a decrease of data traffic during the communication; and a measuring unit, at the radio base station, configured to measure an uplink reception interference level and a downlink transmission power level, and to relay the uplink reception interference level and the downlink transmission power level, along with respective uplink and downlink thresholds, to the mobile radio terminal, wherein the communication unit is configured to shift from the communication using the common channel to the communication using the individual channel with the mobile radio terminal, when the mobile radio terminal indicates that the uplink reception interference level and the downlink transmission power level are not greater than the respective uplink and downlink thresholds. 6. The radio base station as described in claim 5, characterized by having a data transmission control unit for controlling the radio base station and/or the mobile radio terminal such that data transmission is not carried out for a prescribed period of time or data transmission is carried out within a prescribed frequency, with regard to the communication, when an admission of the shift is not possible as a result of the admission judgment for the shift from the common channel to the individual channel so that the communication is to be kept on the common channel. 7. The radio base station as described in claim 6, characterized by having a transmission time control unit for controlling a timing for restarting an individual channel set up operation to be different from other mobile radio terminals, when an admission of the shift is not possible as a result of the admission judgment for the shift from the common channel to the individual channel so that the communication is to be kept on the common channel, and the shift from the common channel to the individual channel is to be attempted again after controlling the radio base station and/or the mobile radio terminal such that data transmission is not carried out for the prescribed period of time or data transmission is carried out within the prescribed frequency with regard to the communication. 8. The radio base station as described in claim 7, characterized in that the transmission time control unit determines the timing for restarting the individual channel set up operation according to a random number. 9. A mobile station device in a mobile communication system of a scheme using spread signals including CDMA, where two types of communication channels including a common channel and a plurality of individual channels are provided such that the common channel is set to be used by a plurality of users together and each individual channel is set to be used exclusively by one user, the mobile station device comprising: a communication unit configured to carry out a communication using the common channel with a radio base station; and an admission judgment unit configured to detect an increase or a decrease of data traffic during the communication, to send an allocation request from the mobile station device to the radio base station upon detection of said increase or decrease of data traffic, and to carry out an admission judgment for a shift from the common channel to the individual channel, said admission judgment unit further configured to receive, from the radio base station in response to said allocation request, a measurement of an uplink reception interference level and a downlink transmission power level, along with respective uplink and downlink thresholds, and to determine whether or not the received measured uplink reception interference level and the downlink transmission power level are greater than the respective uplink and downlink thresholds, wherein the communication unit is configured to shift from the communication using the common channel to the communication using the individual channel with the radio base station, when the admission judgment unit determines that the uplink reception interference level and the downlink transmission power level are not greater than the respective uplink and downlink thresholds. 10. The mobile station device as described in claim 9, characterized by having a data transmission control unit for controlling the mobile station device and/or the radio base station such that data transmission is not carried out for a prescribed period of time or data transmission is carried out within a prescribed frequency, with regard to the communication, when an admission of the shift is not possible as a result of the admission judgment for the shift from the common channel to the individual channel so that the communication is to be kept on the common channel. 11. The mobile station device as described in claim 10, characterized by having a transmission time control unit for controlling a timing for restarting an individual channel set up operation to be different from other mobile radio terminals, when an admission of the shift is not possible as a result of the admission judgment for the shift from the common channel to the individual channel so that the communication is to be kept on the common channel, and the shift from the common channel to the individual channel is to be attempted again after controlling the mobile station device and/or the radio base station such that data transmission is not carried out for the prescribed period of time or data transmission is carried out within the prescribed frequency with regard to communication. 12. The mobile station device as described in claim 11, characterized in that the transmission time control unit determines the timing for restarting the individual channel set up operation according to a random number. 13. A traffic control method for mobile data communications of a radio base station in a mobile communication system of a scheme using spread signals including CDMA, where two types of communication channels including a common channel and a plurality of individual channels are provided such that the common channel is set to be used by a plurality of users together and each individual channel is set to be used exclusively by one user, comprising: carrying out a communication using the common channel, between a mobile radio terminal and said radio base station; receiving at the radio base station an allocation request from the mobile radio terminal after the mobile radio terminal has detected an increase or a decrease of data traffic during the communication; carrying out an admission judgment for a shift from the common channel to the individual channel at the radio base station, said admission judgment including determining whether or not the uplink reception interference level and the downlink transmission power level are greater than the respective uplink and downlink thresholds; relaying the admission judgment to the mobile radio terminal; and shifting from the communication using the common channel to the communication using the individual channel between the mobile radio terminal and the radio base station, when the uplink reception interference level and the downlink transmission power level are not greater than the respective uplink and downlink thresholds, wherein said step of carrying out an admission judgment is repeated upon receipt from the mobile radio terminal of a request to shift, said request to shift transmitted by the mobile radio terminal a predetermined time after the mobile radio terminal receives a negative admission judgment, said predetermined time being set by a timer in the mobile radio terminal. 14. The traffic control method in mobile data communications as described in claim 13, characterized in that, when an admission of the shift is not possible as a result of the admission judgment for the shift from the common channel to the individual channel so that the communication is to be kept on the common channel, the radio base station and/or the mobile radio terminal are controlled such that data transmission is not carried out for a prescribed period of time or data transmission is carried out within a prescribed frequency, with regard to the communication. 15. The traffic control method in mobile data communications as described in claim 14, characterized in that, when an admission of the shift is not possible as a result of the admission judgment for the shift from the common channel to the individual channel so that the communication is to be kept on the common channel, and the shift from the common channel to the individual channel is to be attempted again after controlling the radio base station and/or the mobile radio terminal such that data transmission is not carried out for the prescribed period of time or data transmission is carried out within the prescribed frequency with regard to the communication, a timing for restarting an individual channel set up operation is controlled to be different from other mobile radio terminals. 16. The traffic control method in mobile data communications as described in claim 15, characterized in that the timing for restarting the individual channel set up operation is determined according to a random number. 17. A radio base station device in a mobile communication system of a scheme using spread signals including CDMA, where two types of communication channels including a common channel and a plurality of individual channels are provided such that the common channel is set to be used by a plurality of users together and each individual channel is set to be used exclusively by one user, the radio base station device comprising: a communication unit configured to carry out a communication using the common channel with a mobile radio terminal; and an admission judgment unit configured to receive an allocation request from the mobile radio terminal after the mobile radio terminal has detected an increase or a decrease of data traffic during the communication, and to carry out an admission judgment for a shift from the common channel to the individual channel, said admission judgment unit further configured to determine whether or not the uplink reception interference level and the downlink transmission power level are greater than the respective uplink and downlink thresholds and to relay the admission judgment to the mobile radio terminal, wherein the communication unit is configured to shift from the communication using the common channel to the communication using the individual channel with the mobile radio terminal, when the uplink reception interference level and the downlink transmission power level are not greater than the respective uplink and downlink thresholds, and said admission judgment unit is further configured to re-perform said admission judgment upon receipt from the mobile radio terminal of a request to shift, said request to shift transmitted by the mobile radio terminal a predetermined time after the mobile radio terminal receives a negative admission judgment from the radio base station device, said predetermined time being set by a timer in the mobile radio terminal. 18. The radio base station device as described in claim 17, characterized by having a data transmission control unit for controlling the radio base station device and/or the mobile radio terminal such that data transmission is not carried out for a prescribed period of time or data transmission is carried out within a prescribed frequency, with regard to the communication, when an admission of the shift is not possible as a result of the admission judgment for the shift from the common channel to the individual channel so that the communication is to be kept on the common channel. 19. The radio base station device as described in claim 18, characterized by having a transmission time control unit for controlling a timing for restarting an individual channel set up operation to be different from other mobile radio terminals, when an admission of the shift is not possible as a result of the admission judgment for the shift from the common channel to the individual channel so that the communication is to be kept on the common channel, and the shift from the common channel to the individual channel is to be attempted again after controlling the radio base station device and/or the mobile radio terminal such that data transmission is not carried out for the prescribed period of time or data transmission is carried out within the prescribed frequency with regard to the communication. 20. The radio base station device as described in claim 19, characterized in that the transmission time control unit determines the timing for restarting the individual channel set up operation according to a random number. 21. A mobile station device in a mobile communication system of a scheme using spread signals including CDMA, where two types of communication channels including a common channel and a plurality of individual channels are provided such that the common channel is set to be used by a plurality of users together and each individual channel is set to be used exclusively by one user, comprising: a communication unit configured to carry out a communication using the common channel with a radio base station; and an admission judgment unit configured to detect an increase or a decrease of data traffic at the mobile station device during the communication, and to carry out an admission judgment for a shift from the common channel to the individual channel at the radio base station or the mobile station device, said admission judgment including sending an allocation request after detecting said increase or decrease of data traffic and including subsequently receiving from the radio base station an indication of whether or not the uplink reception interference level and the downlink transmission power level are greater than the respective uplink and downlink thresholds, wherein the communication unit is configured to shift from the communication using the common channel to the communication using the individual channel with the radio base station, when the uplink reception interference level and the downlink transmission power level are not greater than the respective uplink and downlink thresholds, and said admission judgment unit is configured to perform another admission judgment a predetermined time after the mobile station device generates a negative admission judgment, said predetermined time being set by a timer in the mobile station device. 22. The mobile station device as described in claim 21, characterized by having a data transmission control unit for controlling the mobile station device and/or the radio base station such that data transmission is not carried out for a prescribed period of time or data transmission is carried out within a prescribed frequency, with regard to the communication, when an admission of the shift is not possible as a result of the admission judgment for the shift from the common channel to the individual channel so that the communication is to be kept on the common channel. 23. The mobile station device as described in claim 22, characterized by having a transmission time control unit for controlling a timing for restarting an individual channel set up operation to be different from other mobile radio terminals, when an admission of the shift is not possible as a result of the admission judgment for the shift from the common channel to the individual channel so that the communication is to be kept on the common channel, and the shift from the common channel to the individual channel is to be attempted again after controlling the mobile station device and/or the radio base station such that data transmission is not carried out for the prescribed period of time or data transmission is carried out within the prescribed frequency with regard to communication. 24. The mobile station device as described in claim 23, characterized in that the transmission time control unit determines the timing for restarting the individual channel set up operation according to a random number. 25. A traffic control method for a mobile station device in a mobile communication system of a scheme using spread signals including CDMA, where two types of communication channels including a common channel and a plurality of individual channels are provided such that the common channel is set to be used by a plurality of users together and each individual channel is set to be used exclusively by one user, comprising: carrying out a communication using the common channel with a radio base station; detecting at the mobile station device an increase or a decrease of data traffic during the communication; sending an allocation request to the radio base station upon detection of said increase or decrease of data traffic; receiving, from the radio base station in response to said allocation request, a measurement of an uplink reception interference level and a downlink transmission power level, along with respective uplink and downlink thresholds; determining whether or not the received measured uplink reception interference level and the downlink transmission power level are greater than the respective uplink and downlink thresholds; and shifting from the communication using the common channel to the communication using the individual channel with the radio base station when the uplink reception interference level and the downlink transmission power level are not greater than the respective uplink and downlink thresholds. 26. A traffic control method for mobile data communications of a mobile radio terminal in a mobile communication system of a scheme using spread signals including CDMA, where two types of communication channels including a common channel and a plurality of individual channels are provided such that the common channel is set to be used by a plurality of users together and each individual channel is set to be used exclusively by one user, comprising: carrying out a communication using the common channel with a radio base station; receiving an allocation request from the mobile radio terminal after the mobile radio terminal has detected an increase or a decrease of data traffic during the communication; carrying out an admission judgment for a shift from the common channel to the individual channel, including determining whether or not the uplink reception interference level and the downlink transmission power level are greater than the respective uplink and downlink thresholds; relaying the admission judgment to the mobile radio terminal; shifting from the communication using the common channel to the communication using the individual channel with the mobile radio terminal, when the uplink reception interference level and the downlink transmission power level are not greater than the respective uplink and downlink thresholds, and re-performing said admission judgment upon receipt from the mobile radio terminal of a request to shift, said request to shift transmitted by the mobile radio terminal a predetermined time after the mobile radio terminal receives a negative admission judgment from the radio base station, said predetermined time being set by a timer in the mobile radio terminal.