Data transmission method and device
Embodiments of the present disclosure provide a data transmission method and device. The method comprises: monitoring PSCCHs in each slot within a slot set separately, to detect whether exists a PSCCH transmitted from a second terminal targeting to the first terminal in each slot within a slot set (S 202 ); receiving an associated PSSCH based on each detected PSCCH targeting to the first terminal (S 204 ); and transmitting one PSFCH carrying a HARQ feedback corresponding to each slot within the slot set in a slot corresponding to the slot set; wherein, the slot set comprises one or more slots (S 206 ).
1. A data transmission method, comprising:
monitoring, by a first terminal, a physical sidelink control channel (PSCCH) in each slot within a slot set separately, to detect whether exists a PSCCH transmitted from a second terminal targeting to the first terminal in each slot within the slot set;
receiving, by the first terminal, an associated physical sidelink shared channel (PSSCH) based on each detected PSCCH targeting to the first terminal; and
transmitting, by the first terminal, one physical sidelink feedback channel (PSFCH) carrying a HARQ feedback corresponding to each slot within the slot set in a slot corresponding to the slot set;
wherein, the slot set comprises one or more slots,
wherein there are N bit fields in the PSFCH, N equals to a number of slots within the slot set and each bit field corresponds to one slot within the slot set, and
wherein there are M bits in each bit field, M equals to a maximal number of transport blocks (TBs) supported in one PSSCH multiplying by a maximal number of code block groups (CBGs) supported in one PSSCH, and each bit corresponds to a hybrid automatic repeat request (HARQ) feedback of one CBG per TB.
2. The method according to claim 1 , wherein M is pre-configured or configured per resource pool.
3. The method according to claim 1 , wherein for each slot within the slot set, the HARQ feedback is set to NACK when the PSCCH transmitted from the second terminal targeting to the first terminal not being detected.
4. The method according to claim 1 , wherein transmission resource of the PSFCH is determined based on the transmission resource of one of the detected PSCCHs, or based on transmission resource of the PSSCH which corresponds to one of the detected PSCCHs.
5. The method according to claim 4 , wherein transmission resource of the PSFCH is determined based on the transmission resource of the first detected PSCCH, or based on transmission resource of the PSSCH which corresponds to the first detected PSCCH.
6. The method according to claim 4 , wherein transmission resource of the PSFCH is determined based on the transmission resource of the PSCCH with a highest priority among the detected PSCCH, or based on transmission resource of the PSSCH which corresponds to the PSCCH with the highest priority among the detected PSCCH.
7. The method according to claim 1 , wherein transmission resource of the PSFCH is indicated in at least one of the detected sidelink control information (SCIs) transmitted from the second terminal targeting to the first terminal.
8. A data transmission method, comprising:
transmitting, by a second terminal, a physical sidelink control channel (PSCCH) and associated physical sidelink shared channel (PSSCH) PSSCH in any one or more of slots within a slot set to a first terminal; and
receiving, by the second terminal, a physical sidelink feedback channel (PSFCH) carrying a HARQ feedback corresponding to each slot within the slot set in a slot corresponding to the slot set from the first terminal;
wherein, the slot set comprises one or more slots,
wherein there are N bit fields in the PSFCH, N equals to a number of slots within the slot set and each bit field corresponds to one slot within the slot set, and
wherein there are M bits in each bit field, M equals to a maximal number of transport blocks (TBs) supported in one PSSCH multiplying by a maximal number of code block groups (CBGs) supported in one PSSCH, and each bit corresponds to a hybrid automatic repeat request (HARQ) feedback of one CBG per TB.
9. The method according to claim 8 , wherein M is pre-configured or configured per resource pool.
10. The method according to claim 8 , further comprising:
detecting, by the second terminal, the PSFCH in candidate transmission resources determined by the transmitted PSCCH or transmitted PSSCH sequentially.
11. The method according to claim 10 , wherein the detecting the PSFCH in candidate transmission resources determined by the transmitted PSCCH or transmitted PSSCH sequentially comprises: detecting the PSFCH based on the transmitted PSCCH or the transmitted PSSCH from first to last sequentially.
12. The method according to claim 10 , wherein the detecting the PSFCH in candidate transmission resources determined by the transmitted PSCCH or transmitted PSSCH sequentially comprises: detecting the PSFCH based on the transmitted PSCCH or the transmitted PSSCH from last to first sequentially.
13. The method according to claim 10 , wherein the detecting the PSFCH in candidate transmission resources determined by the transmitted PSCCH or transmitted PSSCH sequentially comprises: detecting the PSFCH based on the transmitted PSCCH or the transmitted PSSCH according to priority from highest to lowest sequentially.
14. The method according to claim 8 , further comprising:
filtering, by the second terminal, each candidate transmission resource.
15. A terminal device, comprising:
a processor;
a memory configured to store instructions executable by the processor,
wherein the processor is configured to perform steps of a data transmission method, comprising:
monitoring, by a first terminal, a physical sidelink control channel (PSCCH) in each slot within a slot set separately, to detect whether exists a PSCCH transmitted from a second terminal targeting to the first terminal in each slot within the slot set;
receiving, by the first terminal, an associated physical sidelink shared channel (PSSCH) based on each detected PSCCH targeting to the first terminal; and
transmitting, by the first terminal, one physical sidelink feedback channel (PSFCH) carrying a HARQ feedback corresponding to each slot within the slot set in a slot corresponding to the slot set;
wherein, the slot set comprises one or more slots,
wherein there are N bit fields in the PSFCH, N equals to a number of slots within the slot set and each bit field corresponds to one slot within the slot set, and
wherein there are M bits in each bit field, M equals to a maximal number of transport blocks (TBs) supported in one PSSCH multiplying by a maximal number of code block groups (CBGs) supported in one PSSCH, and each bit corresponds to a hybrid automatic repeat request (HARQ) feedback of one CBG per TB.