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AssigneeNtt Docomo, Inc.
InventorsShingo Suwa, Hiroyuki Atarashi, Mamoru Sawahashi
Estimating the term…
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.
A preamble transmission method according to which, in an uplink transmission from each of a plurality of mobile stations to a base station, to which a direct sequence code division multiple access system that employs a plurality of carriers, is applied, the mobile stations transmit a preamble to the base station before transmitting an information symbol sequence, comprising:
A mobile station which, in an uplink transmission from this mobile station to a base station to which a direct sequence code division multiple access system that employs a plurality of carriers, is applied, transmits a preamble before transmitting an information symbol sequence, comprising:
A mobile communications system which comprises a base station and a plurality of mobile stations, and according to which a direct sequence code division multiple access system that employs a plurality of carriers, is applied to an uplink transmission from the mobile stations to the base station,
Dependencies are inferred from the claim text.