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US 9,794,926 B2Granted
Method and apparatus of transmitting control information considering TDD-FDD CA
AssigneeIP Cube Partners Co., Ltd.
InventorDong Hyun Park
Life of this patent
Estimating the term…
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.
Claims18
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.
5 more elements
A base station comprising:
- 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.
5 more elements
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:
- 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.
7 more elements
Dependencies are inferred from the claim text.