Congestion control for sidelink communication based on non-sidelink activity detection

A method of sidelink communications, comprising:

• identifying a number of non-sidelink occupied resources in a measurement window having a total number of resources in an unlicensed spectrum, wherein the total number of resources can be used by sidelink transmissions and non-sidelink transmissions, wherein identifying the number of non-sidelink occupied resources in the measurement window is based on determining a number of sidelink resources in the measurement window, wherein determining the number of sidelink resources comprises:
• determining whether a resource of the total number of resources includes a transmission from one or more radio access technologies (RATs) different from a sidelink communication;
• and
• determining the resource of the total number of resources to be identified as one of the number of sidelink resources based on determining that the resource includes an absence of transmission from the one or more RATs different from the sidelink communication;
• determining a channel occupancy ratio (CR) limit for a sidelink transmission based on at least a channel busy ratio (CBR) determined accounting for at least the number of non-sidelink occupied resources in the measurement window;
• calculating a CR for the sidelink transmission;
• and
• transmitting, or refraining from transmitting, the sidelink transmission respectively based on whether the CR does not or does exceed the CR limit;
• wherein determining that the resource includes the absence of the transmission from the one or more RATs different from the sidelink communication comprises:
• measuring an energy level in one or more energy detection (ED) windows in the resource;
• and
• determining that the energy level is less than or equal to an ED threshold.

An apparatus for sidelink communication, comprising:

• a memory configured to store instructions;
• and
• a processor communicatively coupled with the memory, wherein the processor is configured to:
• identify a number of non-sidelink occupied resources in a measurement window having a total number of resources in an unlicensed spectrum, wherein the total number of resources can be used by sidelink transmissions and non-sidelink transmissions;
• identify the number of sidelink resources in the measurement window based on the total number of resources minus the number of non-sidelink occupied resources;
• identify a number of busy sidelink resources in the number of sidelink resources;
• determine a channel occupancy ratio (CR) limit for a sidelink transmission based on at least a channel busy ratio (CBR) determined accounting for at least the number of non-sidelink occupied resources in the measurement window, wherein determining the CR limit comprises:
• calculating a first CBR based at least on the number of busy sidelink resources and the total number of resources;
• calculating a second CBR based on the first CBR and the number of non-sidelink occupied resources;
• and
• calculating a first CBR and a second CBR and determining the CR limit based at least on the second CBR;
• or
• determining the CR limit based at least on a non-sidelink resource ratio and the CBR;
• calculate a CR for the sidelink transmission;
• and
• transmit, or refrain from transmitting, the sidelink transmission respectively based on whether the CR does not or does exceed the CR limit.

An apparatus for sidelink communication, comprising:

• a memory configured to store instructions;
• and
• a processor communicatively coupled with the memory, wherein the processor is configured to:
• identify a number of non-sidelink occupied resources in a measurement window having a total number of resources in an unlicensed spectrum, wherein the total number of resources can be used by sidelink transmissions and non-sidelink transmissions, wherein to identify the number of non-sidelink occupied resources in the measurement window, the processor is configured to identify the number of non-sidelink occupied resources in the measurement window based on determining a number of sidelink resources in the measurement window, and wherein to determine the number of sidelink resources, the processor is configured to:
• determine whether a resource of the total number of resources includes a transmission from one or more radio access technologies (RATs) different from a sidelink communication;
• and
• determine the resource of the total number of resources to be identified as one of the number of sidelink resources based on determining that the resource includes an absence of transmission from the one or more RATs different from the sidelink communication;
• determine a channel occupancy ratio (CR) limit for a sidelink transmission based on at least a channel busy ratio (CBR) determined accounting for at least the number of non-sidelink occupied resources in the measurement window;
• calculate a CR for the sidelink transmission;
• and
• transmit, or refrain from transmitting, the sidelink transmission respectively based on whether the CR does not or does exceed the CR limit;
• wherein to determine that the resource includes the absence of the transmission from the one or more RATs different from the sidelink communication, the processor is configured to:
• measure an energy level in one or more energy detection (ED) windows in the resource;
• and
• determine that the energy level is less than or equal to an ED threshold.