Method and apparatus of transmitting control information considering TDD-FDD CA
First Claim
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1. A method of transmitting control information from a base station to a user equipment (UE), the method comprising:
- establishing a Radio Resource Control (RRC) connection with the UE through a first serving cell, the first serving cell supporting a Time Division Duplex (TDD) mode;
transmitting an RRC message to the UE through the first serving cell, 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 TDD-FDD CA scheme;
configuring a downlink (DL) downlink control information (DCI) format for indicating a Physical Downlink Shared Channel (PDSCH) transmission on the second serving cell, a 4-bit Hybrid Automatic Repeat reQuest (HARQ) process number field and a 2-bit DL downlink assignment index (DAI) field being configured in the DL DCI format; and
transmitting, to the UE, at least one of a Physical Downlink Control Channel (PDCCH) and an Enhanced PDCCH (EPDCCH), the at least one of the PDCCH and the EPDCCH comprising the DL DCI format.
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Abstract
The present disclosure relates to an apparatus and method for configuring a DCI format for a TDD-FDD CA environment and an FDD-TDD CA environment. According to aspects, an HARQ process number field, a DAI filed in a downlink DCI format, and a DAI field in an uplink DCI format are differently configured for the TDD-FDD CA environment and the FDD-TDD CA environment.
15 Citations
18 Claims
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1. A method of transmitting control information from a base station to a user equipment (UE), the method comprising:
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establishing a Radio Resource Control (RRC) connection with the UE through a first serving cell, the first serving cell supporting a Time Division Duplex (TDD) mode; transmitting an RRC message to the UE through the first serving cell, 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 TDD-FDD CA scheme; configuring a downlink (DL) downlink control information (DCI) format for indicating a Physical Downlink Shared Channel (PDSCH) transmission on the second serving cell, a 4-bit Hybrid Automatic Repeat reQuest (HARQ) process number field and a 2-bit DL downlink assignment index (DAI) field being configured in the DL DCI format; and transmitting, to the UE, at least one of a Physical Downlink Control Channel (PDCCH) and an Enhanced PDCCH (EPDCCH), the at least one of the PDCCH and the EPDCCH comprising the DL DCI format. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of transmitting control information from a base station to a user equipment (UE), the method comprising:
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establishing a Radio Resource Control (RRC) connection with the UE through a first serving cell, the first serving cell supporting a Frequency Division Duplex (FDD) mode; transmitting an RRC message to the UE through the first serving cell, the RRC message comprising carrier aggregation (CA) configuration information, the CA configuration information comprising information of a second serving cell supporting a Time Division Duplex (TDD) mode, and the first serving cell and the second serving cell being aggregated by an FDD-TDD CA scheme; configuring a downlink (DL) downlink control information (DCI) format for indicating a Physical Downlink Shared Channel (PDSCH) transmission on the second serving cell, a 3-bit Hybrid Automatic Repeat reQuest (HARQ) process number field being configured in the DL DCI format, wherein a DL downlink assignment index (DAI) field is not configured in the DL DCI format; and transmitting, to the UE, at least one of a Physical Downlink Control Channel (PDCCH) and an Enhanced PDCCH (EPDCCH), the at least one of the PDCCH and the EPDCCH comprising the DL DCI format. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method of receiving a downlink control information (DCI) by a User Equipment (UE), the UE supporting a carrier aggregation of a Time Division Duplex (TDD) cell and a Frequency Division Duplex (FDD) cell, the method comprising:
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establishing a Radio Resource Control (RRC) connection with a base station through a primary serving cell (PCell); configuring an FDD cell as a secondary serving cell (SCell) when the PCell is a TDD cell or configuring a TDD cell as the SCell when the PCell is an FDD cell; monitoring a physical downlink control channel (PDCCH) or an Enhanced PDCCH (EPDCCH) to retrieve DCI, the DCI comprising an uplink (UL) DCI format and a downlink (DL) DCI format; decoding the DCI according to the configuration of the PCell and the SCell; when a TDD cell is configured as the PCell and an FDD cell is configured as the SCell, retrieving a 2-bit downlink assignment index (DAI) field from the UL DCI format, and retrieving a 4-bit hybrid automatic repeat request (HARQ) process number field from the DL DCI format; and when an FDD cell is configured as the PCell and a TDD cell is configured as the SCell, retrieving a 3-bit HARQ process number field from the DL DCI format. - View Dependent Claims (18)
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Specification