Mimo communication method, mimo transmitting device and mimo receving device

A mobile station device which communicates with a base station device in a MIMO communication comprising

• a feedback creation module and a complementary feedback storage module, wherein
• the feedback creation module creates a first feedback information comprising the most significant bits of the channel state information and a second feedback information comprising the remaining bits;
• the second feedback information is stored in the complementary feedback storage module;
• the mobile station device transmits the first feedback information to the base station device;
• the mobile station device further transmits the second feedback information to the base station device upon being requested to do so by the base station device.

A base station device which communicates with one or more mobile station devices in a MIMO communication comprising

• a complementary feedback storage module and a feedback reconstruction module, wherein
• the base station device receives a first feedback information from each mobile station device and stores it in the feedback storage module;
• the base station device selects a set of mobile station devices to be part of an MU-MIMO group based on the first feedback information of all the mobile station devices;
• the base station device requests a second feedback information to the mobile station devices belonging to the MU-MIMO group;
• the base station device receives a second feedback information from each mobile station device belonging to the MU-MIMO group and stores it in the feedback storage module,
• the base station device combining the first feedback information and the second feedback information of each mobile station device to obtain the channel state information of each mobile station device,
• the base station device performing MIMO transmission based on the channel state information of all the mobile station devices.

A MIMO communication method between a base station device and one or more mobile station devices, wherein

• the mobile station devices transmit a first feedback information to the base station device,
• the first feedback information comprising the most significant bits of the channel state information between each mobile station device and the base station device;
• the base station device selects a set of mobile station devices to be part of an MU-MIMO group based on the first feedback information of all the mobile station devices;
• the base station device requests a second feedback information to the mobile station devices belonging to the MU-MIMO group;
• the mobile station devices receiving a request for a second feedback information transmit a second feedback information to the base station device,
• the second feedback information comprising bits of the channel state information that are not transmitted in the first feedback information.