Combined open loop/closed loop (CQI-based) uplink transmit power control with interference mitigation for E-UTRA
First Claim
1. A wireless transmit/receive unit (WTRU) configured to:
- receive a downlink control message, the downlink control message comprising uplink scheduling information, wherein the uplink scheduling information comprises modulation and coding set (MCS) information and transmit power control (TPC) information;
measure a pathloss based on a received signal;
determine a transmit power level for a uplink shared channel transmission using a combined open loop and closed loop power control scheme, wherein an open loop power control parameter for the combined open loop and closed loop power control scheme comprises the measured pathloss, and a closed loop power correction factor for the combined open loop and closed loop power control scheme is based on at least the TPC information and the MCS information; and
transmit the uplink shared channel transmission at the determined transmit power level in accordance with the uplink scheduling information.
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Abstract
A combined open loop and closed loop (channel quality indicator (CQI)-based) transmit power control (TPC) scheme with interference mitigation for a long term evolution (LTE) wireless transmit/receive unit (WTRU) is disclosed. The transmit power of the WTRU is derived based on a target signal-to-interference noise ratio (SINR) and a pathloss value. The pathloss value pertains to the downlink signal from a serving evolved Node-B (eNodeB) and includes shadowing. An interference and noise value of the serving eNodeB is included in the transmit power derivation, along with an offset constant value to adjust for downlink (DL) reference signal power and actual transmit power. A weighting factor is also used based on the availability of CQI feedback.
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Citations
30 Claims
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1. A wireless transmit/receive unit (WTRU) configured to:
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receive a downlink control message, the downlink control message comprising uplink scheduling information, wherein the uplink scheduling information comprises modulation and coding set (MCS) information and transmit power control (TPC) information; measure a pathloss based on a received signal; determine a transmit power level for a uplink shared channel transmission using a combined open loop and closed loop power control scheme, wherein an open loop power control parameter for the combined open loop and closed loop power control scheme comprises the measured pathloss, and a closed loop power correction factor for the combined open loop and closed loop power control scheme is based on at least the TPC information and the MCS information; and transmit the uplink shared channel transmission at the determined transmit power level in accordance with the uplink scheduling information. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method implemented by a wireless transmit/receive unit (WTRU), the method comprising:
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the WTRU receiving a downlink control message, the downlink control message comprising uplink scheduling information, wherein the uplink scheduling information comprises modulation and coding set (MCS) information and transmit power control (TPC) information; the WTRU measuring a pathloss based on a received signal; the WTRU determining a transmit power level for a uplink shared channel transmission using a combined open loop and closed loop power control scheme, wherein an open loop power control parameter for the combined open loop and closed loop power control scheme comprises the measured pathloss, and a closed loop power correction factor for the combined open loop and closed loop power control scheme is based on at least the TPC information and the MCS information; and the WTRU transmitting the uplink shared channel transmission at the determined transmit power level in accordance with the uplink scheduling information. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A wireless transmit/receive unit (WTRU) configured to:
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measure a pathloss based on a received signal; determine a transmit power level for an uplink shared channel transmission using a combined open loop and closed loop power control scheme, wherein an open loop power control parameter for the combined open loop and closed loop power control scheme comprises the measured pathloss, and a closed loop power control component for the combined open loop and closed loop power control scheme is based on at least modulation and coding set (MCS) information received from a base station and on transmit power control (TPC) information; and transmit the uplink shared channel transmission at the determined transmit power level. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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23. A method implemented by a wireless transmit/receive unit (WTRU), the method comprising:
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the WTRU measuring a pathloss based on a received signal; the WTRU determining a transmit power level for an uplink shared channel transmission using a combined open loop and closed loop power control scheme, wherein an open loop power control parameter for the combined open loop and closed loop power control scheme comprises the measured pathloss, and a closed loop power correction factor for the combined open loop and closed loop power control scheme is based on at least modulation and coding set (MCS) information received from a base station and on transmit power control (TPC) information; and the WTRU transmitting the uplink shared channel transmission at the determined transmit power level. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30)
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Specification