Unicast or multicast sidelink control information sending method and communications device

1. A sidelink control information sending method, comprising:

sending, by a first communications device, first sub control information to a second communications device and a third communications device, wherein the first sub control information is scrambled by using a common scrambling sequence, the first communications device and the second communications device belong to a first communications device group, the third communications device does not belong to the first communications device group, the first sub control information belongs to first sidelink control information, the first sidelink control information is used to indicate the first communications device to send first sidelink data to the second communications device, the first sub control information comprises transmission resource indication information of the first sidelink data, and the transmission resource indication information of the first sidelink data is used to indicate a resource used by the first communications device to send the first sidelink data; and

sending, by the first communications device, second sub control information to the second communications device, wherein the second sub control information is scrambled by using a scrambling sequence generated by using a user equipment identifier of the second communications device or a scrambling sequence generated by using a group identifier of the first communications device group, the second sub control information belongs to the first sidelink control information, and the second sub control information is control information that is in the first sidelink control information and that is other than the first sub control information.

2. The method according to claim 1 , wherein:

the first sub control information comprises at least one of transmission priority information, resource reservation information, frequency domain resources for initial transmission and retransmission, time interval information for initial transmission and retransmission, hybrid automatic repeat request acknowledgment or negative acknowledgment feedback resource reservation, frequency domain resources for initial hybrid automatic repeat request transmission or hybrid automatic repeat request retransmission, or a retransmission index; and

the second sub control information comprises at least one of a modulation and coding scheme, a new data indicator, a transmission mode, a reserved information bit, a hybrid automatic repeat request process number, or a channel state feedback indicator.

3. The method according to claim 1 , comprising:

receiving, by the first communications device, first communications device group joining request information from the second communications device, wherein the first communications device group joining request information comprises the user equipment identifier of the second communications device; and

sending, by the first communications device, first communications device group joining acknowledgment information to the second communications device, wherein the first communications device group joining acknowledgment information comprises the group identifier of the first communications device group and a user equipment identifier of the first communications device; or

sending, by the first communications device, first communications device group joining request information to the second communications device, wherein the first communications device group joining request information comprises a user equipment identifier of the first communications device; and

receiving, by the first communications device, first communications device group joining acknowledgment information from the second communications device, wherein the first communications device group joining acknowledgment information comprises the group identifier of the first communications device group and the user equipment identifier of the second communications device.

4. The method according to claim 1 , comprising:

receiving, by the first communications device, first downlink control information from a network device, wherein the first downlink control information is used to indicate a first resource, and wherein the first resource comprises a second resource and a third resource; or

selecting, by the first communications device, a first resource from a resource pool, wherein the first resource comprises a second resource and a third resource;

wherein the sending, by a first communications device, first sub control information to a second communications device and a third communications device comprises sending, by the first communications device, the first sub control information to the second communications device and the third communications device on the second resource; and

wherein the sending, by the first communications device, second sub control information to the second communications device comprises sending, by the first communications device, the second sub control information to the second communications device on the third resource.

5. A sidelink control information receiving method, comprising:

receiving, by a second communications device, first sub control information from a first communications device, wherein the first sub control information is scrambled by using a common scrambling sequence, the first communications device and the second communications device belong to a first communications device group, the first sub control information belongs to first sidelink control information, the first sidelink control information is used to indicate the first communications device to send first sidelink data to the second communications device, the first sub control information comprises transmission resource indication information of the first sidelink data, and the transmission resource indication information of the first sidelink data is used to indicate a resource used by the first communications device to send the first sidelink data; and

receiving, by the second communications device, second sub control information from the first communications device, wherein the second sub control information is scrambled by using a scrambling sequence generated by using a user equipment identifier of the second communications device or a scrambling sequence generated by using a group identifier of the first communications device group, the second sub control information belongs to the first sidelink control information, and the second sub control information is control information that is in the first sidelink control information and that is other than the first sub control information.

6. The method according to claim 5 , wherein:

the first sub control information comprises at least one of transmission priority information, resource reservation information, frequency domain resources for initial transmission and retransmission, time interval information for initial transmission and retransmission, hybrid automatic repeat request acknowledgment or negative acknowledgment feedback resource reservation, frequency domain resources for initial hybrid automatic repeat request transmission or hybrid automatic repeat request retransmission, or a retransmission index; and

the second sub control information comprises at least one of a modulation and coding scheme, a new data indicator, a transmission mode, a reserved information bit, a hybrid automatic repeat request process number, or a channel state feedback indicator.

7. The method according to claim 5 , comprising:

receiving, by the second communications device, first communications device group joining request information from the first communications device, wherein the first communications device group joining request information comprises a user equipment identifier of the first communications device; and

sending, by the second communications device, first communications device group joining acknowledgment information to the first communications device, wherein the first communications device group joining acknowledgment information comprises the group identifier of the first communications device group and the user equipment identifier of the second communications device; or

sending, by the second communications device, first communications device group joining request information to the first communications device, wherein the first communications device group joining request information comprises the user equipment identifier of the second communications device; and

receiving, by the second communications device, first communications device group joining acknowledgment information from the first communications device, wherein the first communications device group joining acknowledgment information comprises the group identifier of the first communications device group and the user equipment identifier of the first communications device.

8. A sidelink control information receiving method, comprising:

receiving, by a third communications device, first sub control information from a first communications device, wherein the first sub control information is scrambled by using a common scrambling sequence, the first communications device belongs to a first communications device group, the third communications device does not belong to the first communications device group, the first sub control information belongs to first sidelink control information, the first sidelink control information is used to indicate the first communications device to send first sidelink data to the third communications device, the first sidelink control information comprises second sub control information different from the first sub control information, the second sub control information is scrambled by using a scrambling sequence generated by using a user equipment identifier of a second communications device or a scrambling sequence generated by using a group identifier of the first communications device group, the first sub control information comprises transmission resource indication information of the first sidelink data, and the transmission resource indication information of the first sidelink data is used to indicate a resource used by the first communications device to transmit the first sidelink data; and

determining, by the third communications device, a first resource based on the first sub control information, wherein the first resource comprises a resource used by the first communications device to send the first sidelink data.

9. The method according to claim 8 , wherein the first sub control information comprises at least one of transmission priority information, resource reservation information, frequency domain resources for initial transmission and retransmission, time interval information for initial transmission and retransmission, hybrid automatic repeat request acknowledgment or negative acknowledgment feedback resource reservation, frequency domain resources for initial hybrid automatic repeat request transmission or hybrid automatic repeat request retransmission, or a retransmission index.

10. The method according to claim 8 , comprising:

determining, by the third communications device, a second resource in a resource pool based on the first resource, wherein the second resource does not comprise the first resource, and wherein the second resource is used by the third communications device to transmit sidelink information.

11. A first communications device, comprising:

at least one processor; and

one or more memories coupled to the at least one processor and storing programming instructions for execution by the at least one processor to:

send first sub control information to a second communications device and a third communications device, wherein the first sub control information is scrambled by using a common scrambling sequence, the first communications device and the second communications device belong to a first communications device group, the third communications device does not belong to the first communications device group, the first sub control information belongs to first sidelink control information, the first sidelink control information is used to indicate the first communications device to send first sidelink data to the second communications device, wherein the first sub control information comprises transmission resource indication information of the first sidelink data, and the transmission resource indication information of the first sidelink data is used to indicate a resource used by the first communications device to send the first sidelink data; and

send second sub control information to the second communications device, the second sub control information is scrambled by using a scrambling sequence generated by using a user equipment identifier of the second communications device or a scrambling sequence generated by using a group identifier of the first communications device group, the second sub control information belongs to the first sidelink control information, and the second sub control information is control information that is in the first sidelink control information and that is other than the first sub control information.

12. The device according to claim 11 , wherein:

the first sub control information comprises at least one of transmission priority information, resource reservation information, frequency domain resources for initial transmission and retransmission, time interval information for initial transmission and retransmission, hybrid automatic repeat request acknowledgment or negative acknowledgment feedback resource reservation, frequency domain resources for initial hybrid automatic repeat request transmission or hybrid automatic repeat request retransmission, or a retransmission index; and

the second sub control information comprises at least one of a modulation and coding scheme, a new data indicator, a transmission mode, a reserved information bit, a hybrid automatic repeat request process number, or a channel state feedback indicator.

13. The device according to claim 11 , wherein the programming instructions are for execution by the at least one processor to:

receive first communications device group joining request information from the second communications device, wherein the first communications device group joining request information comprises the user equipment identifier of the second communications device; and

send first communications device group joining acknowledgment information to the second communications device, wherein the first communications device group joining acknowledgment information comprises the group identifier of the first communications device group and a user equipment identifier of the first communications device; or

send first communications device group joining request information to the second communications device, wherein the first communications device group joining request information comprises a user equipment identifier of the first communications device; and

receive first communications device group joining acknowledgment information from the second communications device, wherein the first communications device group joining acknowledgment information comprises the group identifier of the first communications device group and the user equipment identifier of the second communications device.

14. The device according to claim 11 , wherein the programming instructions are for execution by the at least one processor to:

receive first downlink control information from a network device, wherein the first downlink control information is used to indicate a first resource, and wherein the first resource comprises a second resource and a third resource; or

select a first resource from a resource pool, wherein the first resource comprises a second resource and a third resource;

wherein the sending first sub control information to a second communications device and a third communications device comprises sending the first sub control information to the second communications device and the third communications device on the second resource; and

wherein the sending second sub control information to the second communications device comprises sending the second sub control information to the second communications device on the third resource.

15. A second communications device, comprising:

at least one processor; and

one or more memories coupled to the at least one processor and storing programming instructions for execution by the at least one processor to:

receive first sub control information from a first communications device, wherein the first sub control information is scrambled by using a common scrambling sequence, the first communications device and the second communications device belong to a first communications device group, the first sub control information belongs to first sidelink control information, the first sidelink control information is used to indicate the first communications device to send first sidelink data to the second communications device, the first sub control information comprises transmission resource indication information of the first sidelink data, and the transmission resource indication information of the first sidelink data is used to indicate a resource used by the first communications device to send the first sidelink data; and

receive second sub control information from the first communications device, wherein the second sub control information is scrambled by using a scrambling sequence generated by using a user equipment identifier of the second communications device or a scrambling sequence generated by using a group identifier of the first communications device group, the second sub control information belongs to the first sidelink control information, and the second sub control information is control information that is in the first sidelink control information and that is other than the first sub control information.

16. The device according to claim 15 , wherein:

the first sub control information comprises at least one of transmission priority information, resource reservation information, frequency domain resources for initial transmission and retransmission, time interval information for initial transmission and retransmission, hybrid automatic repeat request acknowledgment or negative acknowledgment feedback resource reservation, frequency domain resources for initial hybrid automatic repeat request transmission or hybrid automatic repeat request retransmission, or a retransmission index; and

the second sub control information comprises at least one of a modulation and coding scheme, a new data indicator, a transmission mode, a reserved information bit, a hybrid automatic repeat request process number, or a channel state feedback indicator.

17. The device according to claim 15 , wherein the programming instructions are for execution by the at least one processor to:

receive first communications device group joining request information from the first communications device, wherein the first communications device group joining request information comprises a user equipment identifier of the first communications device; and

send first communications device group joining acknowledgment information to the first communications device, wherein the first communications device group joining acknowledgment information comprises the group identifier of the first communications device group and the user equipment identifier of the second communications device; or

send first communications device group joining request information to the first communications device, wherein the first communications device group joining request information comprises the user equipment identifier of the second communications device; and

receive first communications device group joining acknowledgment information from the first communications device, wherein the first communications device group joining acknowledgment information comprises the group identifier of the first communications device group and the user equipment identifier of the first communications device.

18. A third communications device, comprising:

at least one processor; and

one or more memories coupled to the at least one processor and storing programming instructions for execution by the at least one processor to:

receive first sub control information from a first communications device, wherein the first sub control information is scrambled by using a common scrambling sequence, the first communications device belongs to a first communications device group, the third communications device does not belong to the first communications device group, the first sub control information belongs to first sidelink control information, the first sidelink control information is used to indicate the first communications device to send first sidelink data to the third communications device, the first sidelink control information comprises second sub control information different from the first sub control information, the second sub control information is scrambled by using a scrambling sequence generated by using a user equipment identifier of a second communications device or a scrambling sequence generated by using a group identifier of the first communications device group, the first sub control information comprises transmission resource indication information of the first sidelink data, and the transmission resource indication information of the first sidelink data is used to indicate a resource used by the first communications device to transmit the first sidelink data; and

determine a first resource based on the first sub control information, wherein the first resource comprises a resource used by the first communications device to send the first sidelink data.

19. The device according to claim 18 , wherein the first sub control information comprises at least one of transmission priority information, resource reservation information, frequency domain resources for initial transmission and retransmission, time interval information for initial transmission and retransmission, hybrid automatic repeat request acknowledgment or negative acknowledgment feedback resource reservation, frequency domain resources for initial hybrid automatic repeat request transmission or hybrid automatic repeat request retransmission, or a retransmission index.

20. The device according to claim 18 , wherein the programming instructions are for execution by the at least one processor to:

determine a second resource in a resource pool based on the first resource, wherein the second resource does not comprise the first resource, and wherein the second resource is used by the third communications device to transmit sidelink information.