Power control method and device to trade off desired signal power and interference among multiple wireless devices

A method in a second node for wireless communication, comprising:

• transmitting a first information element, the first information element being used for indicating a first reference power value;
• and
• receiving a first radio signal;
• wherein a first power value is a transmitting power of the first radio signal, the first power value is related to a first smaller value between the first reference power value and a second limit power value, the second limit power value is indicated by a second information element, a second information set comprises a plurality of second-type information elements, the second information element is one of the plurality of second-type information elements, a target receiver of the second information set includes a transmitter of the first radio signal;
• the first power value is a second smaller value between a maximum transmitting power value and a first candidate power value, the first candidate power value is linearly correlated with the first smaller value, with a correlation coefficient being 1;
• the first reference power value includes a first nominal reference power value and a first UE reference power value, the first nominal reference power value is common to a plurality of UEs, while the first UE reference power value is UE-specific, the first nominal reference power value is provided by a radio resource control (RRC) layer signaling while the first UE reference power value is provided by the first information element, the first information element does not comprise the first nominal reference power value;
• the second limit power value includes a second nominal limit power value and a second UE limit power value, the second nominal limit power value is common to the plurality of UEs, while the second UE limit power value is UE-specific, the second information element comprises the second nominal limit power value;
• a transmitter of any second-type information element of the plurality of second-type information elements in the second information set and the second node are non-co-located;
• the first radio signal is transmitted via unicast.

A first node for wireless communication, comprising:

• a first receiver, receiving a first information element, the first information element being used for indicating a first reference power value;
• wherein the first receiver receives a second information set, the second information set comprising a plurality of second-type information elements, a second information element is one of the plurality of second-type information elements, the second information element being used for indicating a second limit power value;
• and
• a first transmitter, transmitting a first radio signal with a first power value;
• wherein a target receiver of the first radio signal includes a transmitter of the first information element, the first power value is related to a first smaller value between the first reference power value and the second limit power value;
• the first power value is a second smaller value between a maximum transmitting power value and a first candidate power value, the first candidate power value is linearly correlated with the first smaller value, with a correlation coefficient being 1;
• the first reference power value includes a first nominal reference power value and a first UE reference power value, the first nominal reference power value is common to a plurality of UEs, while the first UE reference power value is specific to the first node, the first nominal reference power value is provided by a radio resource control (RRC) layer signaling while the first UE reference power value is provided by the first information element, the first information element does not comprise the first nominal reference power value;
• the second limit power value includes a second nominal limit power value and a second UE limit power value, the second nominal limit power value is common to the plurality of UEs, while the second UE limit power value is specific to the first node, the second information element comprises the second nominal limit power value;
• a transmitter of any second-type information element of the plurality of second-type information elements in the second information set and a transmitter of the first information element are non-co-located;
• the first radio signal is transmitted via unicast.

A second node for wireless communication, comprising:

• a second transmitter, transmitting a first information element, the first information element being used for indicating a first reference power value;
• and
• a third receiver, receiving a first radio signal;
• a first power value is a transmitting power of the first radio signal, the first power value is related to a first smaller value between the first reference power value and a second limit power value, the second limit power value is indicated by a second information element, a second information set comprises a plurality of second-type information elements, the second information element is one of the plurality of second type information elements, a target receiver of the second information set includes a transmitter of the first radio signal;
• the first power value is a second smaller value between a maximum transmitting power value and a first candidate power value, the first candidate power value is linearly correlated with the first smaller value, with a correlation coefficient being 1;
• the first reference power value includes a first nominal reference power value and a first UE reference power value, the first nominal reference power value is common to a plurality of UEs, while the first UE reference power value is UE-specific, the first nominal reference power value is provided by a radio resource control (RRC) layer signaling while the first UE reference power value is provided by the first information element, the first information element does not comprise the first nominal reference power value;
• the second limit power value includes a second nominal limit power value and a second UE limit power value, the second nominal limit power value is common to the plurality of UEs, while the second UE limit power value is UE-specific, the second information element comprises the second nominal limit power value;
• a transmitter of any second-type information element of the plurality of second type information elements in the second information set and the second node are non co-located;
• and
• the first radio signal is transmitted via unicast.