摘要:
With the object of efficiently transmitting a variety of different information signals by utilizing the multi-carrier characteristics of Multi-carrier/DS-CDMA, the present invention is characterized in that, when, in an uplink transmission from a plurality of mobile stations to a base station, the mobile stations transmit a preamble to the base station before transmitting an information symbol sequence, the mobile stations individually select a carrier from among a plurality of carriers, and, up until receiving a preamble receipt confirmation signal from the base station with a prescribed maximum number of preamble transmissions serving as an upper limit number; the mobile stations repeatedly transmit a preamble by means of the selected carrier and vary the transmission power used for the transmissions of each carrier.
摘要:
The transmission system of the present invention is designed to transmit a plurality of signals between the transmitter and the receiver using a plurality of carriers and comprises a radio link characteristics estimator 4 configured to estimate the characteristics of a radio link between the transmitter and the receiver and a carrier quantity determination unit 3 configured to determine the number of carriers according to the result of the estimate by the radio link characteristics estimator 4. The radio link characteristics estimator 4 estimates the characteristics according to an interval in delay time of multipath signals and the number of the multipath signals. The carrier quantity determination unit 3 determines fewer carriers when multipath interference is small, and determines more carriers when the multipath interference is great.
摘要:
A mobile station includes: a QoS (quality of service) requirement determination unit configured to determine a QoS requirement for a data packet; a downlink channel condition estimation unit configured to estimate a downlink channel condition; an identification number extracting unit configured to extract an identification number for the mobile station; and a notification unit configured to notify a base station of the QoS requirement, the identification number for the mobile station, and the downlink channel condition by means of a reservation packet. A base station includes: an uplink channel condition estimation unit configured to estimate an uplink channel condition by means of a reservation packet; a radio parameter control unit configured to determine and control a radio parameter based on the reservation packet and the uplink channel condition.
摘要:
A mobile station includes: a QoS (quality of service) requirement determination unit configured to determine a QoS requirement for a data packet; a downlink channel condition estimation unit configured to estimate a downlink channel condition; an identification number extracting unit configured to extract an identification number for the mobile station; and a notification unit configured to notify a base station of the QoS requirement, the identification number for the mobile station, and the downlink channel condition by means of a reservation packet. A base station includes: an uplink channel condition estimation unit configured to estimate an uplink channel condition by means of a reservation packet; a radio parameter control unit configured to determine and control a radio parameter based on the reservation packet and the uplink channel condition.