Wireless communication device and method for determining transmission rate based on interference amount information

A wireless communication method comprising:

• receiving a first frame from a first terminal and a second frame from a second terminal;
• obtaining quality information of a first channel with the first terminal based on the first frame and quality information of a second channel with the second terminal based on the second frame;
• and
• determining a transmission rate applied to the first terminal and a transmission rate applied to the second terminal in spatially multiplexed transmission, based on the quality information of the first channel, the quality information of the second channel and interference amount information being indicative of an amount of interference depending on an execution condition of the spatially multiplexed transmission,
• wherein the execution condition of the spatially multiplexed transmission is a channel aging time after acquisition of the Quality information of the first or the second channel, and
• the interference amount indicated by the interference amount information takes a larger value as the channel aging time becomes longer.

A wireless communication device comprising:

• a receiver configured to receive a first frame from a first terminal and a second frame from a second terminal;
• and
• controlling circuitry configured to
• obtain quality information of a first channel with the first terminal based on the first frame and quality information of a second channel with the second terminal based on the second frame, and
• determine a transmission rate applied to the first terminal and a transmission rate applied to the second terminal in spatially multiplexed transmission, based on the quality information of the first channel, the quality information of the second channel and interference amount information being indicative of an amount of interference depending on an execution condition of the spatially multiplexed transmission,
• wherein the receiver is configured to receive a third frame to an nth frame from a third terminal to an nth terminal, and
• the controlling circuitry is configured to
• obtain quality information of a third channel with the third terminal to quality information of an nth channel with the nth terminal,
• calculate first to nth transmission rates applicable to the first terminal to the nth terminal based on the quality information of the first to the nth channels and the interference amount information,
• calculate transmission time lengths necessary for transmitting frames to the first to nth terminals based on the first to the nth transmission rates and sizes of the frames transmitted to the first to the nth terminals, and
• select a plurality of terminals targeted for the spatially multiplexed transmission from among the first to the nth terminals based on proximity of the transmission time lengths of the frames transmitted to the first to the nth terminals.