User equipments, base stations and methods for downlink semi-persistent scheduling

1. A user equipment (UE) comprising:

receiving circuitry,

transmitting circuitry,

a processor, and

a memory; wherein,

the receiving circuitry is configured to:

receive system information comprising first information of a first time domain resource assignment including a first slot offset (K0) for a physical downlink shared channel (PDSCH),

receive a UE-specific radio resource control (RRC) signal comprising second information of a second time domain resource assignment including a second slot offset (K0) for the PDSCH,

detect a physical downlink control channel (PDCCH), wherein

the first time domain resource assignment for the PDSCH and the second time domain resource assignment for the PDSCH are each a time domain resource assignment based on a slot offset (K0) between a first slot at which the PDCCH is detected and a second slot at which the PDSCH is received,

perform, in response to detecting the PDCCH, the reception of the PDSCH based on one of: the first information or the second information; and

use, in response to the detection of the PDCCH, the second information for the reception of the PDSCH when both the first information and the second information have been received and the second information has overridden the first information.

2. The user equipment according to claim 1 , wherein the receiving circuitry is further configured to:

use, in response to the detection of the PDCCH, the first information for the reception of the PDSCH when the first information has been received and the first information has not yet been overridden by the second information or when the first information has been received and the second information has not yet been received.

3. The user equipment according to claim 1 , wherein

the system information is remaining minimum system information.

4. The user equipment according to claim 1 , wherein the receiving circuitry is further configured to:

use the detected PDCCH for receiving downlink control information with a cyclic redundancy check (CRC) scrambled by a configured scheduling radio network temporary identifier (CS-RNTI).

5. The user equipment according to claim 1 , wherein the transmitting circuitry is configured to:

transmit, in response to the reception of the PDSCH, a hybrid automatic request-ack (HARQ-ACK).

6. The user equipment according to claim 2 , wherein

the first information of the first time domain resource assignment comprises a first set of timing information for the reception of the PDSCH, and

the second information of the second time domain resource assignment comprises a second set of timing information for the reception of the PDSCH; wherein

the receiving circuitry is further configured to:

use, when the first information of the first time domain resource assignment is used for the PDSCH reception in response to detecting the PDCCH, a first one timing information among the second set of timing information, indicated by the detected PDCCH, for the reception of the PDSCH; and

use, when the second information of the second time domain resource assignment is used for the PDSCH reception in response to detecting the PDCCH, a second one timing information among the first set of timing information, indicated by the detected PDCCH, for the reception of the PDSCH.

7. A base station apparatus comprising:

receiving circuitry,

transmitting circuitry,

a processor,

and a memory; wherein,

the transmitting circuitry is configured to:

transmit system information comprising first information of a first time domain resource assignment including a first slot offset (K0) for a physical downlink shared channel (PDSCH),

transmit a UE-specific radio resource control (RRC) signal comprising second information of a second time domain resource assignment including a second slot offset (K0) for the PDSCH,

transmit a physical downlink control channel (PDCCH), wherein

the first time domain resource assignment for the PDSCH and the second time domain resource assignment for the PDSCH are each a time domain resource assignment based on a slot offset (K0) between a first slot at which the PDCCH is transmitted and a second slot at which the PDSCH is transmitted,

perform, in response to transmitting the PDCCH, the transmission of the PDSCH based on one of: the first information or the second information; and

use, in response to the transmission of the PDCCH, the second information for the transmission of the PDSCH when both the first information and the second information have been transmitted and the second information has overridden the first information.

8. The base station apparatus according to claim 7 , wherein the transmitting circuitry is further configured to:

use, in response to the transmission of the PDCCH, the first information for the transmission of the PDSCH when the first information has been transmitted and the first information has not yet been overridden by the second information or when the first information has been transmitted and the second information has not yet been transmitted.

9. The base station apparatus according to claim 7 , wherein

the system information is remaining minimum system information.

10. The base station apparatus according to claim 7 , wherein the transmitting circuitry is further configured to:

use the detected PDCCH for transmitting downlink control information with a cyclic redundancy check (CRC) scrambled by a configured scheduling radio network temporary identifier (CS-RNTI).

11. The base station apparatus according to claim 7 , wherein the receiving circuitry is configured to:

receive, in response to the transmission of the PDSCH, a hybrid automatic repeat request-ack (HARQ-ACK).

12. The base station apparatus according to claim 8 , wherein

the first information of the first time domain resource assignment comprises a first set of timing information for the transmission of the PDSCH, and

the second information of the second time domain resource assignment comprises a second set of timing information for the transmission of the PDSCH; wherein

the transmitting circuitry is further configured to:

use, when the first information of the first time domain resource assignment is used for the PDSCH transmission in response to transmitting the PDCCH, a first one timing information among the second set of timing information, indicated by the transmitted PDCCH, for the transmission of the PDSCH; and

use, when the second information of the second time domain resource assignment is used for the PDSCH transmission in response to transmitting the PDCCH, a second one timing information among the first set of timing information, indicated by the transmitted PDCCH, for the transmission of the PDSCH.

13. A communication method of a user equipment (UE) comprising:

receiving system information comprising first information of a first time domain resource assignment including a first slot offset (K0) for a physical downlink shared channel (PDSCH);

receiving a UE-specific radio resource control (RRC) signal comprising second information of a second time domain resource assignment including a second slot offset (K0) for the PDSCH; and

detecting a physical downlink control channel (PDCCH), wherein the first time domain resource assignment for the PDSCH and the second time domain resource assignment for the PDSCH are each a time domain resource assignment based on a slot offset (K0) between a first slot at which the PDCCH is detected and a second slot at which the PDSCH is received.

14. The communication method according to claim 13 , comprising:

determining, in response to detecting the PDCCH, that the second information has not overridden the first information; and

performing, in response to determining that the second information has not overridden the first information, the reception of the PDSCH using the first information; wherein

the first information of the first time domain resource assignment comprises a first set of timing information for the PDSCH reception and the PDCCH detection is used for indicating a first one timing information among the first set of timing information.

15. The communication method according to claim 13 , wherein

the system information is remaining minimum system information.

16. The communication method according to claim 13 , wherein

the PDCCH is used for receiving downlink control information with cyclic redundancy check (CRC) scrambled by a configured scheduling radio network temporary identifier (CS-RNTI).

17. The communication method according to claim 13 , further comprising:

transmitting a hybrid automatic repeat request-ack (HARQ-ACK) in response to the reception of the PDSCH.

18. The communication method according to claim 13 , comprising:

overriding, in response to receiving the second information, the first information with the second information;

determining, in response to detecting the PDCCH, that the second information has overridden the first information; and

performing, in response to determining that the second information has overridden the first information, the reception of the PDSCH using the second information; wherein

the second information of the second time domain resource assignment comprises a second set of timing information for the PDSCH reception and the PDCCH is used for indicating a second one timing information among the second set of timing information.

19. A communication method of a base station apparatus comprising:

transmitting system information comprising first information of a first time domain resource assignment including a first slot offset (K0) for a physical downlink shared channel (PDSCH);

transmitting a UE-specific radio resource control (RRC) signal comprising second information of a second time domain resource assignment including a second slot offset (K0) for the PDSCH; and

transmitting a physical downlink control channel (PDCCH), wherein the first time domain resource assignment for the PDSCH and the second time domain resource assignment for the PDSCH are each a time domain resource assignment based on a slot offset (K0) between a first slot at which the PDCCH is transmitted and a second slot at which the PDSCH is transmitted.

20. The communication method according to claim 19 , comprising:

determining, in response to transmitting the PDCCH, that the second information has not overridden the first information; and

performing, in response to determining that the second information has not overridden the first information, the transmission of the PDSCH using the first information; wherein

the first information of the first time domain resource assignment comprises a first set of timing information for the PDSCH transmission and the PDCCH transmission is used for indicating a first one timing information among the first set of timing information.

21. The communication method according to claim 19 , wherein

the system information is remaining minimum system information.

22. The communication method according to claim 19 , wherein

the PDCCH is used for transmitting downlink control information with cyclic redundancy check (CRC) scrambled by a configured scheduling radio network temporary identifier (CS-RNTI).

23. The communication method according to claim 19 , further comprising:

receiving a hybrid automatic repeat request-ack (HARQ-ACK) in response to the transmission of the PDSCH.

24. The communication method according to claim 19 , comprising:

overriding, in response to transmitting the second information, the first information with the second information;

determining, in response to transmitting the PDCCH, that the second information has overridden the first information; and

performing, in response to determining that the second information has overridden the first information, the transmission of the PDSCH using the second information; wherein

the second information of the second time domain resource assignment comprises a second set of timing information for the PDSCH transmission and the PDCCH transmission is used for indicating a second one timing information among the second set of timing information.