Method and apparatus for reporting doppler information of time-varying channel in wireless communication systems

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

• receiving, from a user equipment (UE), capability information indicating a capability for a time correlated channel state information (CSI) report;
• transmitting, to the UE, a first configuration enabling a time correlated CSI report and a second configuration indicating a mapping relationship between codepoints of an indicator and Doppler frequency shift values;
• transmitting, to the UE, one or more first CSI-reference signals (CSI-RSs) and one or more second CSI-RSs, wherein the one or more first CSI-RSs are associated with a first Doppler frequency shift value and the one or more second CSI-RSs are associated with a second Doppler frequency shift value;
• and
• receiving, from the UE, a first time correlated CSI report including an indicator corresponding to a codepoint indicating the first Doppler frequency shift value, and a second time correlated CSI report without the indicator,
• wherein the first Doppler frequency shift value is non-zero,
• wherein the second Doppler frequency shift value is zero,
• wherein the codepoint of the indicator indicating the first Doppler frequency shift value is based on the second configuration,
• wherein the first time correlated CSI report includes a bit indicating a presence of the indicator, and
• wherein the second time correlated CSI report includes the bit indicating an absence of the indicator.

A user equipment (UE) in a communication system, the UE comprising:

• a transceiver;
• and
• at least one processor configured to:
• transmit, to a base station, capability information indicating a capability for a time correlated channel state information (CSI) report,
• receive, from the base station, a first configuration enabling a time correlated CSI report and a second configuration indicating a mapping relationship between codepoints of an indicator and Doppler frequency shift values,
• receive, from the base station, one or more first CSI-reference signals (CSI-RSs) and one or more second CSI-RSs,
• obtain:
• based on the one or more first CSI-RSs, a first Doppler frequency shift value according to the first configuration, wherein the first Doppler frequency shift value is non-zero, and
• based on the one or more second CSI-RSs, a second Doppler frequency shift value according to the first configuration, wherein the second Doppler frequency shift value is zero,
• transmit, to the base station, a first time correlated CSI report including the indicator corresponding to a codepoint indicating the first Doppler frequency shift value and a second time correlated CSI report without the indicator,
• wherein the codepoint of the indicator indicating the first Doppler frequency shift value is based on the second configuration,
• wherein the first time correlated CSI report includes a bit indicating a presence of the indicator, and
• wherein the second time correlated CSI report includes the bit indicating an absence of the indicator.

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

• a transceiver;
• and
• at least one processor configured to:
• receive, from a user equipment (UE), capability information indicating a capability for a time correlated channel state information (CSI) report,
• transmit, to the UE, a first configuration enabling a time correlated CSI report and a second configuration indicating a mapping relationship between codepoints of an indicator and Doppler frequency shift values,
• transmit, to the UE, one or more first CSI-reference signals (CSI-RSs) and one or more second CSI-RSs, wherein the one or more first CSI-RSs are associated with a first Doppler frequency shift value and the one or more second CSI-RSs are associated with a second Doppler frequency shift value, and
• receive, from the UE, a first time correlated CSI report including an indicator corresponding to a codepoint indicating the first Doppler frequency shift value, and a second time correlated CSI report without the indicator,
• wherein the first Doppler frequency shift value is non-zero,
• wherein the second Doppler frequency shift value is zero,
• wherein the codepoint of the indicator indicating the first Doppler frequency shift value is based on the second configuration,
• wherein the first time correlated CSI report includes a bit indicating a presence of the indicator, and
• wherein the second time correlated CSI report includes the bit indicating an absence of the indicator.