Uplink (UL) power control apparatus and method in broadband wireless communication system
First Claim
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1. A Mobile Station (MS) in a wireless communication system, comprising:
- a power controller for acquiring a last transmit power value PTx,CL—
last in a closed loop power control mode, a path loss value LOL—
init estimated at the 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, when a power control mode is changed from a closed loop power control to an open loop power control, calculating a power compensation value Offset_SSperSS using the acquired values, and determining a transmit power level P according to the open loop power control using the power compensation value; and
a transmitter for adjusting a transmit power of an Uplink (UL) signal according to the determined transmit power level P.
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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.
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Citations
15 Claims
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1. A Mobile Station (MS) in a wireless communication system, comprising:
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a power controller for acquiring a last transmit power value PTx,CL — last in a closed loop power control mode, a path loss value LOL— init estimated at the 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, when a power control mode is changed from a closed loop power control to an open loop power control, calculating a power compensation value Offset_SSperSS using the acquired values, and determining a transmit power level P according to the open loop power control using the power compensation value; anda transmitter for adjusting a transmit power of an Uplink (UL) signal according to the determined transmit power level P. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An uplink (UL) power control method in a wireless communication system, the method comprising:
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calculating a power compensation value using a last transmit power in a previous closed loop power control when a power control mode is changed from a closed loop power control to an open loop power control; and determining a transmit power according to the open loop power control using the power compensation value, wherein the power compensation value Offset_SSperSS is calculated based on
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8. An uplink (UL) power control method in a wireless communication system, 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 CINR value C/NCL— last for a last Modulation and Coding Scheme (MCS) level in the closed loop power control mode, and a number of repetitions RCL— last according to the last MCS level; andcalculating 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 (9, 10, 11, 12, 13)
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14. A power control apparatus in a wireless communication system, comprising:
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means for acquiring, when a power control mode is changed from a closed loop power control to an open loop power control, a final 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 CINR value C/NCL— last for a last Modulation and Coding Scheme (MCS) level in the closed loop power control mode, and a number of repetitions RCL— last according to the last MCS level; andmeans for calculating a power compensation value Offset_SSperSS controlled by the MS using the acquired values based on
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15. A Mobile Station (MS) in a wireless communication system, comprising:
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a power controller for calculating a power compensation value using a final transmit power in a previous closed loop power control when a power control mode is changed from a closed loop power control 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 an uplink (UL) signal under control of the power controller, wherein the power controller calculates the power compensation value Offset_SSperSS based on
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Specification