Channel State Information Reporting

An apparatus in a communication system, comprising:

• at least one processor;
• and
• at least one non-transitory memory storing instructions that, when executed with the at least one processor, cause the apparatus to:
• transmit to a network element the capabilities of the apparatus;
• receive from the network element a channel predictor to be used, the predictor being at least partly based on the capabilities of the terminal device;
• receive from the network element the length of a given time period for collecting channel state information, the time period being based on at least partly on the determined channel predictor;
• receive reference data from the network node;
• measure the state of the channel between the apparatus and the network node based on the reference data;
• transmit, for a given time period, channel state information to the network node;
• receive from the network node information on channel predictor function;
• receive from the network node payload data, the data transmission comprising reference information;
• calculate a predicted state of the channel utilising the channel predictor function known with the network node;
• determine variation between the predicted state of channel and the measured state of channel;
• and
• transmit information on the variation to the network node as update information.

A method, comprising:

• receiving from a terminal device capabilities of the terminal device;
• determine a channel predictor to be used at least partly based on the capabilities of the terminal device;
• determining and transmitting to the terminal device length of a given time period for collecting channel state information, based on at least partly on the determined channel predictor;
• transmitting reference information to the terminal device for the duration of the given time period;
• receiving, as a response to the reference information transmission, channel state information from the terminal device;
• determining, with training the channel predictor, a channel predictor function to be used in the communication between the apparatus and the terminal device at least partly based on the capabilities of the terminal device and the received channel state information;
• transmitting information on the channel predictor function to the terminal device;
• calculating a predicted state of the channel utilising the channel predictor function known with the terminal device;
• transmitting payload data to the terminal device, the data transmission comprising reference information;
• and
• receiving update information to the predicted state of the channel from the terminal device, where the update information is the variation between the channel predicted at the terminal device and the measured channel.