Apparatus and method for controlling transmit power of preamble sequence for AAS in OFDMA communication system
First Claim
1. A method for controlling transmit power of a preamble sequence by a Subscriber Station (SS) in an Orthogonal Frequency Division Multiple Access (OFDMA) communication system, the OFDMA communication system adapted to transmit an Adaptive Antenna System (AAS) preamble sequence and a data symbol, the method comprising:
- determining a transmit power used for transmitting the data symbol; and
determining a transmit power used for transmitting the AAS preamble sequence to be identical to the transmit power used for transmitting the data symbol;
wherein the transmit power used for transmitting the data symbol is determined by at least one of propagation path loss, Carrier-to-Interference and Noise Ratios (CINRs) of the SS, and a reception error probability of received data symbols according to a mobility index of the SS, andwherein the mobility index is a value representing mobility of the SS, which is computed by measuring a reception CINR of downlink preamble sequences or uplink pilot signals and considering a time change of the measured reception CINR; and
wherein, when a power control mode of the SS is an open loop power control mode, the transmit power used for transmitting the data symbol is determined by using both an estimated value for uplink propagation path loss and BS reception interference and noise reported by a BS.
1 Assignment
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Accused Products
Abstract
A method for controlling transmit power of a preamble sequence by a Subscriber Station in an Orthogonal Frequency Division Multiple Access communication system, the system dividing an entire frequency band into a plurality of sub-carrier bands, transmitting an preamble sequence for an Adaptive Antenna System through a predetermined number of sub-carrier bands from among the sub-carrier bands, transmitting a data symbol through remaining sub-carrier bands excluding the sub-carrier bands used for transmitting the preamble sequence. The method includes determining the transmit power used for transmitting the data symbol; and determining the transmit power used for transmitting the preamble sequence to be identical to a preset threshold transmit power when the transmit power of the data symbol is smaller than the threshold transmit power, and determining the transmit power used for transmitting the preamble sequence to be identical to the transmit power of the data symbol when the transmit power of the data symbol exceeds the threshold transmit power.
38 Citations
16 Claims
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1. A method for controlling transmit power of a preamble sequence by a Subscriber Station (SS) in an Orthogonal Frequency Division Multiple Access (OFDMA) communication system, the OFDMA communication system adapted to transmit an Adaptive Antenna System (AAS) preamble sequence and a data symbol, the method comprising:
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determining a transmit power used for transmitting the data symbol; and determining a transmit power used for transmitting the AAS preamble sequence to be identical to the transmit power used for transmitting the data symbol; wherein the transmit power used for transmitting the data symbol is determined by at least one of propagation path loss, Carrier-to-Interference and Noise Ratios (CINRs) of the SS, and a reception error probability of received data symbols according to a mobility index of the SS, and wherein the mobility index is a value representing mobility of the SS, which is computed by measuring a reception CINR of downlink preamble sequences or uplink pilot signals and considering a time change of the measured reception CINR; and wherein, when a power control mode of the SS is an open loop power control mode, the transmit power used for transmitting the data symbol is determined by using both an estimated value for uplink propagation path loss and BS reception interference and noise reported by a BS. - View Dependent Claims (2, 3, 4)
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5. A method for controlling transmit power of a preamble sequence by a Subscriber Station (SS) in an Orthogonal Frequency Division Multiple Access (OFDMA) communication system, the OFDMA communication system adapted to transmit an Adaptive Antenna System (AAS) preamble sequence and a data symbol, the method comprising:
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comparing a transmit power used for transmitting the data symbol with a preset threshold transmit power; determining a transmit power used for transmitting the AAS preamble sequence to be identical to the transmit power used for transmitting the data symbol when the transmit power used for transmitting the data symbol exceeds the preset threshold transmit power; and determining the transmit power used for transmitting the AAS preamble sequence to be identical to the preset threshold transmit power when the transmit power used for transmitting the data symbol is less than the preset threshold transmit power; wherein the transmit power used for transmitting the data symbol is determined by at least one of propagation path loss, Carrier-to-Interference and Noise Ratios (CINRs) of the SS, and a reception error probability of received data symbols according to a mobility index of the SS, and wherein the mobility index is a value representing mobility of the SS, which is computed by measuring a reception CINR of downlink preamble sequences or uplink pilot signals and considering a time change of the measured reception CINR; and wherein, when a power control mode of the SS is an open loop power control mode, the transmit power used for transmitting the data symbol is determined by using both an estimated value for uplink propagation path loss and BS reception interference and noise reported by a BS. - View Dependent Claims (6, 7, 8)
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9. An apparatus for controlling transmit power of a preamble sequence in an Orthogonal Frequency Division Multiple Access (OFDMA) communication system, the OFDMA communication system adapted to transmit an Adaptive Antenna System (AAS) preamble sequence and a data symbol, the apparatus comprising:
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a transmit power controller for determining a transmit power used for transmitting the data symbol, and determining a transmit power used for transmitting the AAS preamble sequence to be identical to the transmit power used for transmitting the data symbol; wherein the transmit power used for transmitting the data symbol is determined by at least one of propagation path loss, Carrier-to-Interference and Noise Ratios (CINRs) of an SS, and a reception error probability of received data symbols according to a mobility index of the SS, and wherein the mobility index is a value representing mobility of the SS, which is computed by measuring a reception CINR of downlink preamble sequences or uplink pilot signals and considering a time change of the measured reception CINR; and wherein, when a power control mode of the SS is an open loop power control mode, the transmit power used for transmitting the data symbol is determined by using both an estimated value for uplink propagation path loss and BS reception interference and noise reported by a BS. - View Dependent Claims (10, 11, 12)
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13. An apparatus for controlling transmit power of a preamble sequence by a Subscriber Station (SS) in an Orthogonal Frequency Division Multiple Access (OFDMA) communication system, the OFDMA communication system adapted to transmit an Adaptive Antenna System (AAS) preamble sequence and a data symbol, the apparatus comprising:
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a transmit power controller that compares a transmit power used for transmitting the data symbol with a preset threshold transmit power, determines a transmit power used for transmitting the AAS preamble sequence to be identical to the transmit power used for transmitting the data symbol when the transmit power used for transmitting the data symbol exceeds the preset threshold transmit power, and determines the transmit power used for transmitting the AAS preamble sequence to be identical to the preset threshold transmit power when the transmit power used for transmitting the data symbol is less than the preset threshold transmit power; wherein the transmit power used for transmitting the data symbol is determined by at least one of propagation path loss, Carrier-to-Interference and Noise Ratios (CINRs) of the SS, and a reception error probability of received data symbols according to a mobility index of the SS, and wherein the mobility index is a value representing mobility of the SS, which is computed by measuring a reception CINR of downlink preamble sequences or uplink pilot signals and considering a time change of the measured reception CINR; and wherein, when a power control mode of the SS is an open loop power control mode, the transmit power used for transmitting the data symbol is determined by using both an estimated value for uplink propagation path loss and BS reception interference and noise reported by a BS. - View Dependent Claims (14, 15, 16)
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Specification