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US 10,122,514 B2Granted
Method and apparatus for transmitting HARQ ACK/NACK
AssigneesSK Telecom Co., Ltd., Innosky
InventorDong Hyun Park
Life of this patent
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Abstract
Provided is a method and apparatus for transmitting an HARQ ACK/NACK. The method includes: recognizing, from a PDCCH or an EPDCCH, a 2-bit uplink (UL) downlink assignment index (DAI) field configured in a UL downlink control information (DCI) format; receiving a PDSCH transmission through the second serving cell; generating an HARQ response signal based on the number of PDSCHs scheduled in the downlink subframes indicated by the UL DAI field and the number of total downlink subframes associated with one uplink subframe; and transmitting the HARQ response signal through a PUSCH in the one uplink subframe.
Claims19
A User Equipment (UE) transmitting a Hybrid Automatic Repeat reQuest (HARQ) response in a wireless communication system, the UE comprising:
- a receiving unit configured to:
- receive an Radio Resource Control (RRC) message from a base station through a first serving cell supporting a Time Division Duplex (TDD) mode, the RRC message comprising carrier aggregation (CA) configuration information, the CA configuration information comprising information of a second serving cell supporting a Frequency Division Duplex (FDD) mode, and the first serving cell and the second serving cell being aggregated by a FDD-TDD CA scheme;
- receive a Physical Downlink Control Channel (PDCCH) transmission or an Enhanced PDCCH (EPDCCH) transmission through the second serving cell;
- and
- receive a Physical Downlink Shared Channel (PDSCH) transmission through the second serving cell;
- a processor operationally coupled to the receiving unit and configured to:
- determine a downlink (DL) reference timing for transmitting an HARQ response signal based on information received through the first serving cell, the HARQ response signal being responsive to the PDSCH transmission through the second serving cell;
- recognize, from the PDCCH or the EPDCCH, a 2-bit uplink (UL) downlink assignment index (DAI) field configured in a UL downlink control information (DCI) format, the UL DCI format indicating a Physical Uplink Shared Channel (PUSCH) transmission on the second serving cell, and the 2-bit UL DAI field indicating the number of PDSCHs scheduled in downlink subframes associated with one uplink subframe of the second serving cell;
- and
- generate an HARQ response signal based on the number of PDSCHs scheduled in the downlink subframes indicated by the UL DAI field and the number of total downlink subframes associated with the one uplink subframe, the HARQ response signal being generated in association with PUCCH format 3 if the number of total downlink subframes associated with the one uplink sub frame is 5 or 6;
- and
- a transmitting unit configured to transmit the HARQ response signal through a PUSCH in the one uplink subframe.
9 more elements
A base station receiving a Hybrid Automatic Repeat reQuest (HARQ) response in a wireless communication system, the base station comprising:
- a transmitting unit configured to:
- transmit, to a User Equipment (UE), an RRC message through the first serving cell, the first serving cell supporting a Time Division Duplex (TDD) mode, the RRC message comprising carrier aggregation (CA) configuration information, the CA configuration information comprising information of a second serving cell supporting a Frequency Division Duplex (FDD) mode, the first serving cell and the second serving cell being aggregated by a TDD-FDD CA scheme, and the second serving cell being configured for the UE according to a self-scheduling scheme;
- transmit, through the first serving cell, information relating to a downlink (DL) reference timing, which enables the UE to trans fit an HARQ response signal based on the DL reference timing, the HARQ response signal being responsive to a Physical Downlink Shared Channel (PDSCH) transmission through the second serving cell;
- transmit, to the UE, a Physical Downlink Control Channel (PDCCH) transmission or an Enhanced PDCCH (EPDCCH) transmission through the second serving cell, the PDCCH or the EPDCCH comprising a 2-bit uplink (UT) downlink assignment index (DAI) field configured in a UL downlink control information (DCI) format, the UL DCI format indicating a Physical Uplink Shared Channel (PUSCH) transmission on the second serving cell, and the 2-bit UL DAI field indicating the number of PDSCHs scheduled in downlink subframes associated with one uplink subframe of the second serving cell;
- and
- transmit, to the UE, the PDSCH through the second serving cell;
- and
- a receiving unit configured to receive an HARQ response signal through a PUSCH in the one uplink subframe, the HARQ response signal being configured based on the number of PDSCHs scheduled in the downlink subframes indicated by the UL DAI field and the number of total downlink subframes associated with the one uplink subframe, the HARQ response signal being configured in association with PUCCH format 3 if the number of total downlink subframes associated with the one uplink subframe is 5 or 6.
5 more elements
A User Equipment (UE) transmitting a Hybrid Automatic Repeat reQuest (HARQ) response in a wireless communication system, the UE comprising:
- a receiving unit configured to:
- receive an Radio Resource Control (RRC) message from a base station through a first serving cell supporting a Time Division Duplex (TDD) mode, the RRC message comprising carrier aggregation (CA) configuration information, the CA configuration information comprising information of a second serving cell supporting a Frequency Division Duplex (FDD) mode, and the first serving cell and the second serving cell being aggregated by a FDD-TDD CA scheme;
- receive a Physical Downlink Control Channel (PDCCH) transmission or an Enhanced PDCCH (EPDCCH) transmission through the second serving cell;
- and
- receive a Physical Downlink Shared Channels (PDSCHs) transmission through the second serving cell;
- a processor operationally coupled to the receiving unit and configured to:
- recognize, from the PDCCH or the EPDCCH, a field indicating the number of PDSCHs scheduled in downlink subframes associated with one uplink subframe of the second serving cell;
- and
- generate an HARQ response signal based on the number of PDSCHs scheduled in the downlink subframes indicated by the field and the number of total downlink subframes associated with the one uplink subframe, the HARQ response signal being generated in association with PUCCH format 3 if the number of total downlink subframes associated with the one uplink sub frame is 5 or 6;
- and
- a transmitting unit configured to transmit the HARQ response signal through a PUSCH in the one uplink subframe.
8 more elements
Dependencies are inferred from the claim text.