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US 8,509,836 B2Granted
Combined open loop/closed loop method for controlling uplink power of a mobile station
AssigneeInterDigital Technology Corporation
InventorsSung-Hyuk Shin, Zinan Lin, Donald M. Grieco, Robert Lind Olesen
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Abstract
A method and apparatus are disclosed comprising a combined open loop/closed loop uplink power control scheme for E-UTRA. The combined open and closed loop method for UL intra-cell PC controls the wireless transmit receive unit (WTRU) transmit power spectral density (PSD), PSDTx, (e.g. power per RB).
Claims30
A method for controlling transmit power of a wireless transmit receive unit (WTRU) comprising:
- determining an open loop uplink (UL) power control (PC) component based on pathloss measurement, wherein the open loop PC component comprises a cell-specific parameter and a WTRU-specific parameter, and wherein the cell-specific and WTRU-specific parameters are provided from higher layers;
- determining a closed loop PC component including a correction factor, wherein the correction factor is based on a PC correction command signaled in a UL grant associated with a hybrid automatic repeat request (HARQ) process;
- combining the open loop PC component and the closed loop PC component with a delta factor related to an offset value to determine a transmit power, wherein the offset value is related to a modulation and coding scheme (MCS);
- and
- applying the transmit power in accordance with a timing of the HARQ process.
2 more elements
A method for controlling transmit power of a wireless transmit receive unit (WTRU) comprising:
- determining an open loop uplink (UL) power control (PC) component based on pathloss measurement;
- determining a closed loop PC component including a correction factor, wherein the correction factor is based on a PC correction command including multiple command bits determined based on link quality;
- combining the open loop PC component and the closed loop PC component with a delta factor related to an offset value to determine a transmit power, wherein the offset value is related to a modulation and coding scheme (MCS), and wherein the correction factor is determined using the following equation:
- Δclosed=┌ESINRest−SINRtarget┘;
- where ESINRest and SINRtarget denotes the effective signal to interference noise ratio (ESINR) and target a SINR.
2 more elements
A method for controlling transmit power of a wireless transmit receive unit (WTRU) comprising:
- determining an open loop uplink (UL) power control (PC) component based on pathloss measurement;
- determining a closed loop PC component including a correction factor, wherein the correction factor is an uplink grant assignment;
- combining the open loop PC component and the closed loop PC component with a delta factor related to an offset value to determine a transmit power, wherein the offset value is related to a modulation and coding scheme (MCS), and, wherein the grant based correction factor is determined using the following equation:
- f(UL grant assignment,SINTT)=SINRT−E{SINRest(UL grant assignment)};
- where SINRest(UL grant assignment) represents an eNodeB received SINR estimate which WTRU derives from the UL grant assignment.
2 more elements
A wireless transmit receive unit (WTRU) comprising a processor, wherein the processor is configured to:
- determine an open loop uplink (UL) power control (PC) component based on pathloss measurement, wherein the open loop PC component comprises a cell-specific parameter and a WTRU-specific parameter, and wherein the cell-specific and WTRU-specific parameters are provided from higher layers;
- determine a closed loop power control component including a correction factor, wherein the correction factor is based on a PC correction command signaled in a UL grant associated with a hybrid automatic repeat request (HARQ) process;
- and
- combine the open loop PC component, the closed loop PC component and a delta factor related to an offset value to determine a WTRU transmit power, wherein the offset value is related to a modulation and coding scheme (MCS);
- and
- apply the transmit power in accordance with a timing of the HARQ process.
3 more elements
A wireless transmit receive unit (WTRU) comprising a processor, wherein the processor is configured to:
- determine an open loop uplink (UL) power control (PC) component based on pathloss measurement;
- determine a closed loop power control component including a correction factor, wherein the correction factor is based on a PC correction command including multiple command bits determined based on link quality;
- and
- combine the open loop PC component, the closed loop PC component and a delta factor related to an offset value to determine a WTRU transmit power, wherein the offset value is related to a modulation and coding scheme (MCS), and wherein the correction factor is determined using the following equation:
- Δclosed=┌ESINRest−SINRtarget┘;
- where ESINRest and SINRtarget denote the effective signal to interference noise ratio (ESINR) and target a SINR.
3 more elements
A wireless transmit receive unit (WTRU) comprising a processor, wherein the processor is configured to:
- determine an open loop uplink (UL) power control (PC) component based on pathloss measurement;
- determine a closed loop power control component including a correction factor, wherein the correction factor is an uplink grant assignment;
- and
- combine the open loop PC component, the closed loop PC component and a delta factor related to an offset value to determine a WTRU transmit power, wherein the offset value is related to a modulation and coding scheme (MCS), and wherein the grant based correction factor is determined using the following equation:
- f(UL grant assignment,SINTT)=SINRT−E{SINRest(UL grant assignment)};
- where SINRest(UL grant assignment) represents an eNodeB received SINR estimate which WTRU derives from the UL grant assignment.
3 more elements
Dependencies are inferred from the claim text.