Method and apparatus of transmitting control information considering TDD-FDD CA
First Claim
Patent Images
1. A base station comprising:
- a transceiver; and
a processor operationally coupled to the transceiver and configured to establish a Radio Resource Control (RRC) connection with a User Equipment (UE) through a first serving cell, the first serving cell supporting a Time Division Duplex (TDD) mode,wherein;
the transceiver transmits 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;
the processor is further configured to configure 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
the transceiver transmits, 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.
13 Citations
18 Claims
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1. A base station comprising:
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a transceiver; and a processor operationally coupled to the transceiver and configured to establish a Radio Resource Control (RRC) connection with a User Equipment (UE) through a first serving cell, the first serving cell supporting a Time Division Duplex (TDD) mode, wherein;
the transceiver transmits 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;the processor is further configured to configure 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 the transceiver transmits, 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 base station comprising:
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a transceiver; and a processor operationally coupled to the transceiver and configured to establish a RadioResource Control (RRC) connection with a User Equipment (UE) through a first serving cell, the first serving cell supporting a Frequency Division Duplex (FDD) mode, wherein;
the transceiver transmits 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;the processor is further configured to configure 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 the transceiver transmits, 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 User Equipment (UE) supporting a carrier aggregation of a Time Division Duplex (TDD) cell and a Frequency Division Duplex (FDD) cell, the UE comprising:
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a transceiver; and a processor operationally coupled to the transceiver and configured to; establish a Radio Resource Control (RRC) connection with a base station through a primary serving cell (PCell); configure an FDD cell as a secondary serving cell (SCell) when the PCell is a TDD cell or configure a TDD cell as the SCell when the PCell is an FDD cell; monitor a physical downlink control channel (PDCCH) or an Enhanced PDCCH (EPDCCH) to retrieve downlink control information (DCI), the DCI comprising an uplink (UL) DCI format and a downlink (DL) DCI format; decode the DCI according to the configuration of the PCell and SCell; when a TDD cell is configured as the PCell and an FDD cell is configured as the SCell, retrieve a 2-bit downlink assignment index (DAI) field from the UL DCI format, and retrieve 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, retrieve a 3-bit HARQ process number field from the DL DCI format. - View Dependent Claims (18)
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Specification