Unicast or multicast sidelink control information sending method and communications device

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.

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.

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.

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.

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.