Method and apparatus for transmitting channel status information in carrier aggregation system
AssigneeLG Electronics Inc.
InventorsDong Youn Seo, Min Gyu Kim, Suck Chel Yang, Joon Kui Ahn
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Abstract
Provided are a method and apparatus for transmitting channel status information (CSI) of a user equipment (UE) in a carrier aggregation system. The method includes: receiving an uplink grant including a CSI request field from a base station (BS); and transmitting aperiodic CSI for a first serving cell, a first serving cell set or a second serving cell set according to a bit value of the CSI request field to the BS via the first serving cell.
Claims12
A method of transmitting channel status information (CSI) of a user equipment (UE) in a carrier aggregation system, the method comprising:
- receiving a higher layer signal comprising a bitmap from a base station (BS);
- receiving a downlink control information (DCI) format including a CSI request field from the BS,
- wherein a size of the CSI request field is 1 bit and a size of the bitmap is N bits, N being a natural number larger than 1;
- generating CSI for a specific downlink component carrier (DL CC), based on the bitmap, among N DL CCs which are configured for the UE when the CSI request field triggers a CSI reporting;
- and
- transmitting the generated CSI to the BS,
- wherein each bit of the bitmap is mapped to a corresponding one of the N DL CCs and indicates a DL CC for which CSI is generated.
A user equipment (UE) comprising:
- a radio frequency (RF) unit configured transmit and receive a radio signal;
- and
- a processor coupled to the RF unit and configured to:
- receive a higher layer signal comprising a bitmap from a base station (BS),
- receive a downlink control information (DCI) format including a channel status information (CSI) request field from the BS,
- wherein a size of the CSI request field being 1 bit and a size of the bitmap is N bits, N being a natural number larger than 1,
- generate CSI for a specific downlink component carrier (DL CC), based on the bitmap, among N DL CCs which are configured for the UE when the CSI request field triggers a CSI reporting, and
- transmit the generated CSI,
- wherein each bit of the bitmap is mapped to a corresponding one of the N DL CCs and indicates a DL CC for which CSI is generated.
Dependencies are inferred from the claim text.