Preamble trasmission method, mobile station, mobile communication system, preamble transmission program and computer data signal
First Claim
1. 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 first carrier selection step in which the mobile stations individually select a carrier from among a plurality of carriers; and
a transmission control step in which, up until receiving a preamble receipt confirmation signal from the base station with a predetermined 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.
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Accused Products
Abstract
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.
47 Citations
17 Claims
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1. 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:
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a first carrier selection step in which the mobile stations individually select a carrier from among a plurality of carriers; and
a transmission control step in which, up until receiving a preamble receipt confirmation signal from the base station with a predetermined 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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. 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:
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carrier selection control means for selecting a carrier from among a plurality of carriers individually for each mobile station;
transmission control means for repeatedly transmitting a preamble by means of the selected carrier until a preamble receipt confirmation signal is received from the base station with a predetermined maximum number of preamble transmissions serving as an upper limit number; and
power control means for exercising control so as to vary the transmission power used for the transmissions of each carrier. - View Dependent Claims (9, 10, 11, 12, 13, 14, 16, 17)
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15. 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,
characterized in that each of the mobile stations includes: -
carrier selection control means for selecting a carrier from among a plurality of carriers individually for each mobile station;
transmission control means for repeatedly transmitting a preamble by means of the selected carrier until a preamble receipt confirmation signal is received from the base station with a prescribed maximum number of preamble transmissions serving as an upper limit number; and
power control means for exercising control so as to vary the transmission power used for the transmissions of each carrier.
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Specification