Combined open loop/closed loop (CQI-based) uplink transmit power control with interference mitigation for E-UTRA
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.
1. An integrated circuit comprising:
circuitry configured to receive downlink control information including both uplink scheduling information and transmit power control (TPC) information, wherein the uplink scheduling information includes modulation and coding set (MCS) information;
the circuitry further configured to determine a transmit power level for a physical uplink channel based on at least a measured pathloss, the TPC information, the MCS information, and a weighting factor, α, where α:
has a value from 0 to 1; and
is multiplied to the measured pathloss; and
the circuitry further configured to output a signal based on the scheduling information and the determined transmit power level for transmission on a physical uplink channel.
2. The integrated circuit according to claim 1 , wherein the physical uplink channel is a physical uplink shared channel (PUSCH).
3. The integrated circuit according to claim 1 , wherein the determined transmit power level is based at least in part on a closed loop power control factor.
4. The integrated circuit according to claim 1 , wherein the determined transmit power level is based on a maximum transmit power level.
5. The integrated circuit according to claim 1 , wherein the physical uplink channel is a physical uplink control channel (PUCCH) and the determined transmit power level is further based on a quality factor associated with channel quality indication (CQI) information of the PUCCH.
6. A wireless transmit/receive unit (WTRU), comprising:
circuitry configured to receive downlink control information including both uplink scheduling information and transmit power control (TPC) information, wherein the uplink scheduling information includes modulation and coding set (MCS) information;
the circuitry further configured to determine a transmit power level for a physical uplink channel based on at least a measured pathloss, the TPC information, the MCS information, and a weighting factor, α, where α:
has a value from 0 to 1; and
is multiplied to the measured pathloss; and
the circuitry further configured to output a signal based on the scheduling information and the determined transmit power level for transmission on a physical uplink channel.
7. The WTRU according to claim 5 , wherein the physical uplink channel is a physical uplink shared channel (PUSCH).
8. The WTRU according to claim 5 , wherein the determined transmit power level is based at least in part on a closed loop power control factor.
9. The WTRU according to claim 5 , wherein the determined transmit power level is based on a maximum transmit power level.
10. The WTRU according to claim 5 , wherein the physical uplink channel is a physical uplink control channel (PUCCH) and the determined transmit power level is further based on a quality factor associated with channel quality indication (CQI) information of the PUCCH.