Apparatus and method for power control, reporting and uplink transmission

A power reporting method, comprising:

• configuring, by a user equipment (UE), uplink power control information
• used for scheduling an uplink transmission of the UE on an unlicensed band;
• and
• transmitting to a base station, by the UE, the uplink power control information,
• wherein the uplink power control information includes at least one of:
• a UE-expected transmit power being an expected uplink transmit power determined by the UE, according to an energy level of other wireless signals detected by the UE, for reducing an interference caused by the other devices,
• power offset information indicating an energy level of the other wireless signals on the same carrier measured by the UE, or
• information indicating whether the UE decreases an uplink transmit power.

An uplink transmission method, comprising:

• determining, by a user equipment (UE), a carrier clear assessment (CCA) threshold according to a UE maximum transmit power;
• measuring, by the UE, an energy level of other signals on a same carrier of an unlicensed band;
• and
• determining, by the UE, an uplink transmission mode of the UE on the carrier according to whether the measured energy level is higher than the CCA threshold.

A method for transmitting uplink control information, comprising:

• generating, by a base station, control information used for control carrier clear assessment (CCA) of uplink transmission, the control information including a CCA threshold for uplink transmission;
• and
• transmitting to a user equipment (UE), by the base station, the control information,
• wherein the control information is used for determining a UE maximum transmit power used for determining a CCA threshold for uplink transmission.

A power control method, comprising:

• receiving, by a user equipment (UE), power control indication information from a base station, and obtaining a transmit power control (TPC) command;
• and
• performing, by the UE, power control adjustment to an uplink transmission of the UE on an unlicensed band according to the TPC command;
• wherein if accumulation is enabled, calculating, by the UE, a transmit power control adjustment state variable fc(i) for the transmission in subframe i for a serving cell c according to fc(i)=fc(i−1)+δc(i−K), wherein δc(i−K) denotes the TPC command received by the UE in subframe i−K, for following conditions 1 to 6,
• 1, the UE does not receive the corresponding TPC command in subframe i−KPUSCH;
• 2, the UE is in a DRX state;
• 3, in the TDD system, subframe i is not an uplink subframe;
• 4, on the unlicensed carrier c, the UE does not transmit uplink signal in subframe i;
• 5, on the unlicensed carrier c, subframe i is not an uplink subframe;
• 6, on the unlicensed carrier c, the UE is not scheduled for uplink transmission in subframe i,
• if any one of the above conditions 1, 2, 3, 4, 5 and 6 is met, δc=0;
• if accumulation is not enabled, calculating, by the UE, the transmit power control adjustment state variable fc(i) for the transmission of the UE in subframe i for the serving cell c according to fc(i)=δc(i−K), wherein δc(i−K) denotes the TPC command received by the UE in subframe i−K, for the above conditions 1 to 6,
• if any one of the above conditions 1, 2, 3, 4, 5 and 6 is met, fc(i)=fc(i−1).

A user equipment (UE), comprising:

• a transceiver;
• and
• a controller coupled with the transceiver, and configured to:
• receive from a base station, power control indication information,
• identify a power control mode indicating that a mechanism for power control is selected by the base station or the UE,
• if the power control mode indicates that the mechanism for power control is selected by the base station, perform power control for an uplink transmission of the UE on an unlicensed band according to a first power control mechanism or a second power control mechanism selected by the base station;
• and
• if the power control mode indicates that the mechanism for power control is selected by the UE, performing, by the UE, power control for the uplink transmission of the UE on the unlicensed band according to the first power control mechanism or a third power control mechanism selected by the UE.

A user equipment (UE), comprising:

• a transceiver;
• and
• a controller coupled with the transceiver, and configured to:
• configure uplink power control information
• used for scheduling an uplink transmission of the UE on an unlicensed band,
• transmit to a base station, the uplink power control information, and
• wherein the uplink power control information including at least one of:
• a UE-expected transmit power being an expected uplink transmit power determined by the UE, according to an energy level of other wireless signals detected by the UE, for reducing an interference caused by the other devices,
• power offset information indicating an energy level of the other wireless signals on the same carrier measured by the UE, or
• information indicating whether the UE decreases an uplink transmit power.

A user equipment (UE), comprising:

• a transceiver;
• and
• a controller coupled with the transceiver, and configured to:
• determine a carrier clear assessment (CCA) threshold according to a UE maximum transmit power;
• measure energy level of other signals on a same carrier of an unlicensed band;
• and
• determine an uplink transmission mode of the UE on the carrier according to whether the measured energy level is higher than the CCA threshold.

A base station, comprising:

• a transceiver;
• and
• a controller coupled to the transceiver, wherein the controller is configured to:
• generate control information used for control carrier clear assessment (CCA) of uplink transmission, the control information including a CCA threshold for uplink transmission;
• and
• transmit to a user equipment (UE), the control information,
• wherein the control information is used for determining a UE maximum transmit power used for determining a CCA threshold for uplink transmission.

A user equipment (UE), comprising:

• a transceiver;
• and
• a controller coupled to the transceiver, wherein the controller is configured to:
• receive power control indication information from a base station, and obtaining a transmit power control (TPC) command;
• and
• perform power control adjustment to an uplink transmission of the UE on an unlicensed band according to the TPC command;
• wherein if accumulation is enabled, calculating, by the UE, a transmit power control adjustment state variable fc(i) for the transmission in subframe i for a serving cell c according to fc(i)=fc(i−1)+δc(i−K), wherein δc(i−K) denotes the TPC command received by the UE in subframe i−K, for following conditions 1 to 6,
• 1, the UE does not receive the corresponding TPC command in subframe i−KPUSCH;
• 2, the UE is in a DRX state;
• 3, in the TDD system, subframe i is not an uplink subframe;
• 4, on the unlicensed carrier c, the UE does not transmit uplink signal in subframe i;
• 5, on the unlicensed carrier c, subframe i is not an uplink subframe;
• 6, on the unlicensed carrier c, the UE is not scheduled for uplink transmission in subframe i,
• if any one of the above conditions 1, 2, 3, 4, 5 and 6 is met, δc=0;
• if accumulation is not enabled, calculating, by the UE, the transmit power control adjustment state variable fc(i) for the transmission of the UE in subframe i for the serving cell c according to fc(i)=δc(i−K), wherein δc(i−K) denotes the TPC command received by the UE in subframe i−K, for the above conditions 1 to 6,
• if any one of the above conditions 1, 2, 3, 4, 5 and 6 is met, fc(i)=fc(i−1).