Method and user device for receiving downlink data, and method and base station for transmitting downlink data
AssigneeLG Electronics Inc.
InventorsHanbyul Seo, Bonghoe Kim
Life of this patent
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Abstract
The present invention enables an increase in data transmission performance by variously applying precoding to open and closed-loop MIMOs. An eNB in the present invention applies an identical precoder to neighboring PRBs scheduled in UE in the closed-loop MIMO, and applies an non-identical precoder to neighboring PRBs scheduled in UE in an open-loop MIMO. The UE variously introduces a precoder applied to neighboring PRBs scheduled in the UE according to whether the MIMO set in the UE is the closed-loop MIMO or the open-loop MIMO.
Claims16
A method for receiving downlink (DL) data by a user equipment (UE), the method comprising:
- receiving the DL data through a physical downlink shared channel (PDSCH);
- and
- decoding the DL data using a UE specific reference signal (UE-RS) received on physical resource blocks (PRBs) allocated to the PDSCH,
- wherein the DL data is decoded under either a first assumption that PRB bundling is enabled, or under a second assumption that the PRB bundling is disabled,
- wherein the DL data is decoded under the first assumption if a precoding matrix index (PMI) is configured to be fed back together with rank information (RI) or a channel quality index (CQI), and if a resource allocation type for the PDSCH is not a distributed type but is a localized type, and
- wherein, under the first assumption, a same precoder is applied to all of the PRBs allocated to the PDSCH among a predetermined number of contiguous PRBs belonging to a PRB group (PRG).
A user equipment (UE) for receiving downlink (DL) data, the user equipment comprising:
- a radio frequency (RF) unit;
- and
- a processor configured to:
- control the RF unit to receive the DL data through a physical downlink shared channel (PDSCH), and
- decode the DL data using a UE specific reference signal (UE-RS) received on physical resource blocks (PRBs) allocated to the PDSCH,
- wherein the DL data is decoded under either a first assumption that PRB bundling is enabled, or under a second assumption that the PRB bundling is disabled,
- wherein the DL data is decoded under the first assumption if a precoding matrix index (PMI) is configured to be fed back together with rank information (RI) or a channel quality index (CQI), and if a resource allocation type for the PDSCH is not a distributed type but is a localized type, and
- wherein, under the first assumption, the processor is further configured to apply a same precoder to all of the PRBs allocated to the PDSCH among a predetermined number of contiguous PRBs belonging to a PRB group (PRG).
A method for transmitting downlink (DL) data by a base station (BS), the method comprising:
- transmitting the DL data to a user equipment (UE) through a physical downlink shared channel (PDSCH);
- and
- transmitting a UE specific reference signal (UE-RS) on physical resource blocks (PRBs) allocated to the PDSCH,
- wherein, if a precoding matrix index (PMI) is configured to be fed back together with rank information (RI) or a channel quality index (CQI), and if a resource allocation type for the PDSCH is not a distributed type but is a localized type, the DL data and the UE-RS are transmitted by applying all of the PRBs allocated to the PDSCH among a predetermined number of contiguous PRBs belonging to a PRB group (PRG), and otherwise, the DL data and the UE-RS are transmitted by applying different precoders to the PRBs allocated to the PDSCH.
A base station (BS) for transmitting downlink (DL) data, the BS comprising:
- a radio frequency (RF) unit;
- and
- a processor configured to:
- control the RF unit to transmit the DL data to a user equipment (UE) through a physical downlink shared channel (PDSCH), and
- control the RF unit to transmit a UE specific reference signal (UE-RS) on physical resource blocks (PRBs) allocated to the PDSCH,
- wherein, if a precoding matrix index (PMI) is configured to be fed back together with rank information (RI) or a channel quality index (CQI), and if a resource allocation type for the PDSCH is not a distributed type but is a localized type, the processor is further configured to apply a same precoder to all of the PRBs allocated to the PDSCH among a predetermined number of contiguous PRBs belonging to a PRB group (PRG), and otherwise, the processor is further configured to apply different precoders to the PRBs allocated to the PDSCH.
Dependencies are inferred from the claim text.