Method and device for energy saving in wireless communication system

A method performed by a base station in a communication system, the method comprising:

• transmitting, to a terminal, configuration information for a channel state information (CSI) report, wherein the configuration information includes a CSI report configuration including a plurality of sub-configurations for sub-reports;
• transmitting, to the terminal, channel state information reference signals (CSI-RSs) associated with the CSI report configuration;
• and
• receiving, from the terminal, CSI corresponding to the CSI-RSs and the configuration information,
• wherein the CSI includes CSI fields of sub-reports ordered by indexes of the sub-reports.

A terminal in a communication system, the terminal comprising:

• transceivers;
• memory storing one or more computer programs;
• and
• one or more processors communicatively coupled to the transceivers and the memory,
• wherein the one or more computer programs include computer-executable instructions that, when executed by the one or more processors individually or collectively, cause the terminal to:
• receive, from a base station, configuration information for a channel state information (CSI) report, wherein the configuration information includes a CSI report configuration including a plurality of sub-configurations for sub-reports,
• receive, from the base station, channel state information reference signals (CSI-RSs) associated with the CSI report configuration,
• identify CSI based on the CSI-RSs and the configuration information, and transmit, to the base station, the CSI,
• wherein the CSI includes CSI fields of sub-reports ordered by indexes of the sub-reports.

A base station in a communication system, the base station comprising:

• transceivers;
• memory storing one or more computer programs;
• and
• one or more processors communicatively coupled to the transceivers and the memory,
• wherein the one or more computer programs include computer-executable instructions that, when executed by the one or more processors individually or collectively, cause the base station to:
• transmit, to a terminal, configuration information for a channel state information (CSI) report, wherein the configuration information includes a CSI report configuration including a plurality of sub-configurations for sub-reports,
• transmit, to the terminal, channel state information reference signals (CSI-RSs) associated with the CSI report configuration, and
• receive, from the terminal, CSI corresponding to the CSI-RSs and the configuration information,
• wherein the CSI includes CSI fields of sub-reports ordered by indexes of the sub-reports.