Base station apparatus, terminal apparatus and communication method
A terminal apparatus includes: a reception unit which receives, from a base station apparatus, a physical downlink control channel including downlink control information in a search space specific to the terminal apparatus; and a control unit which determines the number of bits of a time domain resource allocation field in the downlink control information. The time domain resource allocation field is a time domain resource allocation field for a physical downlink shared channel. A default table indicates a time domain resource allocation configuration for the physical downlink shared channel. When a parameter is not received, the number of bits of the time domain resource allocation field is determined based on the number of the in the default table.
1. A terminal apparatus for communicating with a base station apparatus, the terminal apparatus comprising:
at least one processor; and
at least one memory coupled to the at least one processor, the at least one memory storing one or more computer-executable instructions that, when executed by the at least one processor, cause the terminal apparatus to:
receive, from the base station apparatus, a physical downlink control channel (PDCCH) including downlink control information (DCI) in a search space specific to the terminal apparatus and a physical downlink shared channel (PDSCH) scheduled by the DCI; and
determine a number of bits of a time domain resource allocation field in the DCI as ceiling(log 2(I)), in which the time domain resource allocation field is associated with a time domain resource allocation configuration and a default table for the PDSCH,
wherein:
when a radio resource control (RRC) parameter pdsch-TimeDomainAllocationList is received, I is given by a number of entries in the RRC parameter pdsch-TimeDomainAllocationList, and
when the RRC parameter pdsch-TimeDomainAllocationList is not received, I is given by a fixed number of entries in the default table.
2. The terminal apparatus of claim 1 , wherein the time domain resource allocation field indicates a slot offset between the PDCCH and the PDSCH, a starting symbol of the PDSCH within a slot, a number of consecutive allocated symbols, and a PDSCH mapping type.
3. The terminal apparatus of claim 1 , wherein the DCI is attached with a cyclic redundancy check scrambled by any of a Cell-Radio Network Temporary Identifier (C-RNTI), a Modulation and Coding Scheme (MCS)-C-RNTI, or a Configured Scheduling-RNTI.
4. A base station apparatus for communicating with a terminal apparatus, the base station apparatus comprising:
at least one processor; and
at least one memory coupled to the at least one processor, the at least one memory storing one or more computer-executable instructions that, when executed by the at least one processor, cause the base station apparatus to:
transmit, to the terminal apparatus, a physical downlink control channel (PDCCH) including downlink control information (DCI) in a search space specific to the terminal apparatus and a physical downlink shared channel (PDSCH) scheduled by the DCI; and
determine a number of bits of a time domain resource allocation field in the DCI as ceiling(log 2(I)), in which the time domain resource allocation field is associated with a time domain resource allocation configuration and a default table for the PDSCH,
wherein:
when a radio resource control (RRC) parameter pdsch-TimeDomainAllocationList is transmitted, I is given by a number of entries in the RRC parameter pdsch-TimeDomainAllocationList, and
when the RRC parameter pdsch-TimeDomainAllocationList is not transmitted, I is given by a fixed number of entries in the default table.
5. The base station apparatus of claim 4 , wherein the time domain resource allocation field indicates a slot offset between the PDCCH and the PDSCH, a starting symbol of the PDSCH within a slot, a number of consecutive allocated symbols, and a PDSCH mapping type.
6. The base station apparatus of claim 4 , wherein the DCI is attached with a cyclic redundancy check scrambled by any of a Cell-Radio Network Temporary Identifier (C-RNTI), a Modulation and Coding Scheme (MCS)-C-RNTI, or a Configured Scheduling-RNTI.
7. A communication method for a terminal apparatus communicating with a base station apparatus, the communication method comprising:
receiving, from the base station apparatus, a physical downlink control channel (PDCCH) including downlink control information (DCI) in a search space specific to the terminal apparatus and a physical downlink shared channel (PDSCH) scheduled by the DCI; and
determining a number of bits of a time domain resource allocation field in the DCI as ceiling(log 2(I)), in which the time domain resource allocation field is associated with a time domain resource allocation configuration and a default table for the PDSCH,
wherein:
when a radio resource control (RRC) parameter pdsch-TimeDomainAllocationList is received, I is given by a number of entries in the RRC parameter pdsch-TimeDomainAllocationList, and
when the RRC parameter pdsch-TimeDomainAllocationList is not received, I is given by a fixed number of entries in the default table.
8. The communication method of claim 7 , wherein the time domain resource allocation field indicates a slot offset between the PDCCH and the PDSCH, a starting symbol of the PDSCH within a slot, a number of consecutive allocated symbols, and a PDSCH mapping type.
9. The communication method of claim 7 , wherein the DCI is attached with a cyclic redundancy check scrambled by any of a Cell-Radio Network Temporary Identifier (C-RNTI), a Modulation and Coding Scheme (MCS)-C-RNTI, or a Configured Scheduling-RNTI.