Uplink (UL) power control apparatus and method in broadband wireless communication system
First Claim
1. A Mobile Station (MS) for use in a wireless communication system according to a Time Division Duplexing-Orthogonal Frequency Division Multiple Access (TDD-OFDMA) scheme, the MS comprising:
- a power controller that, when a power control mode is changed from a closed loop power control to an open loop power control,acquires a last transmit power value PTx,CL—
last in a closed loop power control mode, a path loss value LOL—
init estimated at an MS, a latest Noise and Interference (NI) value NIOL—
init received from a Base Station (BS), a required Carrier to Interference and Noise Ratio value (CINR) value C/NCL—
last for a last Modulation and Coding Scheme (MCS) level in the closed loop power control mode, a repetition factor RCL—
last, according to the last MCS level,calculates a power compensation value Offset_SSperSS using the acquired values, anddetermines a transmit power level P, according to the open loop power control, using the power compensation value; and
a transmit modem for adjusting a transmit power of an UpLink (UL) signal according to the determined transmit power level P,wherein the transmit modem comprises a channel coding block, a modulation block, and a Radio Frequency (RF) transmit block.
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Abstract
An uplink (UL) power control apparatus and method in a broadband wireless communication system are provided. The Mobile Station (MS) includes a power controller for calculating a power compensation value using a last transmit power in a previous closed loop power control when a power control mode is changed to an open loop power control, and determining a transmit power according to the open loop power control using the power compensation value; and a transmitter for adjusting and transmitting the transmit power of a UL signal under control of the power controller.
36 Citations
13 Claims
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1. A Mobile Station (MS) for use in a wireless communication system according to a Time Division Duplexing-Orthogonal Frequency Division Multiple Access (TDD-OFDMA) scheme, the MS comprising:
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a power controller that, when a power control mode is changed from a closed loop power control to an open loop power control, acquires a last transmit power value PTx,CL — last in a closed loop power control mode, a path loss value LOL— init estimated at an MS, a latest Noise and Interference (NI) value NIOL— init received from a Base Station (BS), a required Carrier to Interference and Noise Ratio value (CINR) value C/NCL— last for a last Modulation and Coding Scheme (MCS) level in the closed loop power control mode, a repetition factor RCL— last, according to the last MCS level,calculates a power compensation value Offset_SSperSS using the acquired values, and determines a transmit power level P, according to the open loop power control, using the power compensation value; and a transmit modem for adjusting a transmit power of an UpLink (UL) signal according to the determined transmit power level P, wherein the transmit modem comprises a channel coding block, a modulation block, and a Radio Frequency (RF) transmit block. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An UpLink (UL) power control method in a wireless communication system according to a Time Division Duplexing-Orthogonal Frequency Division Multiple Access (TDD-OFDMA) scheme, UL power control method comprising:
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acquiring, when a power control mode is changed from a closed loop power control to an open loop power control, a last transmit power value PTx,CL — last in a closed loop power control mode, a path loss value LOL— init estimated at a Mobile Station (MS), a latest Noise and Interference (NI) value NIOL— init received from a Base Station (BS), a required Carrier to Interference and Noise Ratio value (CINR) value C/NCL— last for a last Modulation and Coding Scheme (MCS) level in the closed loop power control mode, and a repetition factor RCL— last according to the last MCS level;calculating a power compensation value Offset_SSperSS controlled by the MS using the acquired values; and determining a transmit power level P, according to the open loop power control, using the power compensation value Offset_SSperSS. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification