Methods and apparatus for multi-carrier communications with efficient control signaling
First Claim
1. A signal transmission method for a mobile station in a communication system comprising a plurality of base stations operating in a plurality of cells, the method comprising:
- transmitting a first uplink signal to a base station on a first set of subcarriers in a first Orthogonal Frequency Division Multiplexing (OFDM) symbol, wherein the first set of subcarriers are modulated with a first signal sequence, the first signal sequence known to both the mobile station and the base station; and
transmitting a second uplink signal to the base station on a second set of subcarriers in a second OFDM symbol, wherein the second set of subcarriers are modulated with the first signal sequence or a transform of the first signal sequence and further modulated with a second signal sequence, the second signal sequence containing attribute information on a third set of subcarriers of a downlink signal received by the mobile station over a downlink channel, wherein the correspondence between the subcarriers in the third set and the subcarriers in the second set are known to both the mobile station and the base station.
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Accused Products
Abstract
A first uplink signal is transmitted by a mobile station to a base station on a first set of subcarriers in a first OFDM symbol. The first set of subcarriers is modulated with a first signal sequence known to both the mobile station and the base station. A second uplink signal is transmitted by the mobile station to the base station on a second set of subcarriers in a second OFDM symbol. The second set of subcarriers is modulated with the first signal sequence or a transform of the first signal sequence. The second set of subcarriers is modulated with a second signal sequence containing attribute information on a third set of subcarriers of a downlink signal received by the mobile station over a downlink channel. The correspondence between the subcarriers in the third and second set is known to the mobile station and the base station.
21 Citations
40 Claims
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1. A signal transmission method for a mobile station in a communication system comprising a plurality of base stations operating in a plurality of cells, the method comprising:
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transmitting a first uplink signal to a base station on a first set of subcarriers in a first Orthogonal Frequency Division Multiplexing (OFDM) symbol, wherein the first set of subcarriers are modulated with a first signal sequence, the first signal sequence known to both the mobile station and the base station; and transmitting a second uplink signal to the base station on a second set of subcarriers in a second OFDM symbol, wherein the second set of subcarriers are modulated with the first signal sequence or a transform of the first signal sequence and further modulated with a second signal sequence, the second signal sequence containing attribute information on a third set of subcarriers of a downlink signal received by the mobile station over a downlink channel, wherein the correspondence between the subcarriers in the third set and the subcarriers in the second set are known to both the mobile station and the base station. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A signal reception method for a base station in a communication system comprising a plurality of base stations and mobile stations, the method comprising:
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receiving a first uplink signal from a mobile station on a first set of subcarriers in a first Orthogonal Frequency Division Multiplexing (OFDM) symbol, the first set of subcarriers modulated with a first signal sequence and the first signal sequence known to both the mobile station and the base station; and receiving a second uplink signal from the mobile station on a second set of subcarriers in a second OFDM symbol, the second set of subcarriers modulated with the first signal sequence or a transform of the first signal sequence, and further modulated with a second signal sequence, the second signal sequence containing attribute information on a third set of subcarriers of a downlink signal received by the mobile station over a downlink channel, wherein the correspondence between the subcarriers in the third set and the subcarriers in the second set are known to both the mobile station and the base station. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A mobile station in a communication system comprising a plurality of base stations operating a plurality of cells, the mobile station comprising:
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a receiver configured for receiving Orthogonal Frequency Division Multiplexing (OFDM) symbols; and a transmitter configured to; transmit a first uplink signal to a base station on a first set of subcarriers in a first OFDM symbol, wherein the first set of subcarriers are modulated with a first signal sequence, the first signal sequence known to both the mobile station and the base station; and transmit a second uplink signal to the base station on a second set of subcarriers in a second OFDM symbol, wherein the second set of subcarriers are modulated with the first signal sequence or a transform of the first signal sequence, and further modulated with a second signal sequence, the second signal sequence containing attribute information on a third set of subcarriers of a downlink signal received by the mobile station over a downlink channel, wherein the correspondence between the subcarriers in the third set and the subcarriers in the second set are known to both the mobile station and the base station. - View Dependent Claims (27, 28, 29, 30, 31, 32)
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33. A base station in a communication system comprising a plurality of base stations and mobile stations, the base station comprising:
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a transmitter configured for transmitting Orthogonal Frequency Division Multiplexing (OFDM) symbols; and a receiver configured to; receive a first uplink signal from a mobile station on a first set of subcarriers in a first OFDM symbol, the first set of subcarriers modulated with a first signal sequence and the first signal sequence known to both the mobile station and the base station; and receive a second uplink signal from the mobile station on a second set of subcarriers in a second OFDM symbol, the second set of subcarriers modulated with the first signal sequence or a transform of the first signal sequence, and further modulated with a second signal sequence, the second signal sequence containing attribute information on a third set of subcarriers of a downlink signal received by the mobile station over a downlink channel, wherein the correspondence between the subcarriers in the third set and the subcarriers in the second set known to both the mobile station and the base station. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40)
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Specification