Congestion aware DRX_ON adaptation in sidelink unicast

1. An apparatus comprising:

at least one processor; and

at least one non-transitory memory and computer program code, wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to:

determine information related to a sidelink traffic load in a first set of resources, wherein the apparatus is configured with an indication of the first set of resources and an indication of a second set of resources;

determine the sidelink traffic load in the first set of resources based, at least partially, on the determined information;

compare the information related to the sidelink traffic load with at least one threshold, or receive a result of a comparison of the sidelink traffic load with the at least one threshold, wherein the comparing comprises comparing the information related to the sidelink traffic load with a combination of at least one traffic load offset value and the at least one threshold;

based on the determined sidelink traffic load and at least one of: a result of the comparing of the information related to the sidelink traffic load with the at least one threshold or the received result, determine a third set of resources for monitoring; and

monitor the third set of resources.

2. The apparatus of claim 1 , wherein the determined third set of resources comprises at least the first set of resources and at least part of the second set of resources, where the at least one threshold is met or exceeded or the received result indicates to include the at least part of the second set of resources in the determined third set of resources.

3. The apparatus of claim 1 , wherein the comparing of the information related to the sidelink traffic load with the at least one threshold comprises the at least one memory and the computer program code are further configured to, with the at least one processor, cause the apparatus to:

compare the determined sidelink traffic load with a plurality of thresholds of varied values of traffic load size, and

determine a largest value of the plurality of thresholds exceeded by the determined sidelink traffic load, wherein the plurality of thresholds are associated with respective subsets of resources belonging to the second set of resources,

wherein the determining the third set of resources for monitoring comprises the at least one memory and the computer program code are further configured to, with the at least one processor, cause the apparatus to determine one or more subsets of the second set of resources associated with the largest determined threshold.

4. The apparatus of claim 1 , wherein the determined third set of resources comprises the first set of resources and not at least part of the second set of resources, where the at least one threshold is not met or exceeded or the received result indicates to not include the at least part of the second set of resources in the determined third set of resources.

5. The apparatus of claim 1 , wherein the information related to the sidelink traffic load comprises one of:

a channel busy ratio,

a message received from a different apparatus,

occupied resources of the first set of resources,

at least one received signal strength indicator for resources of the first set of resources,

a level of the sidelink traffic load in the first set of resources, or

a number of received physical layer signals or sequences.

6. The apparatus of claim 1 , wherein the apparatus is configured with the indication of the first set of resources and the indication of the second set of resources through at least one of:

pre-configuration of the apparatus,

dedicated signaling received at the apparatus, or

at least one broadcasted system information block received at the apparatus.

7. The apparatus of claim 1 , wherein the at least one memory and the computer program code are further configured to, with the at least one processor, cause the apparatus to determine that the first set of resources are not configured to carry a full message for initiating a sidelink discontinuous reception alignment procedure.

8. The apparatus of claim 1 , wherein the determined third set of resources comprises at least the first set of resources and at least one subset of the second set of resources, wherein the first set of resources are monitored to at least one of:

derive one or more signals or sequences, or

detect a part of a transmission for initiating the sidelink discontinuous reception alignment procedure,

wherein the at least one subset of the second set of resources are monitored to detect one of:

a full message for initiating the sidelink discontinuous reception alignment procedure, or

a different part of the transmission for initiating the sidelink discontinuous reception alignment procedure.

9. An apparatus comprising:

at least one processor; and

at least one non-transitory memory and computer program code, wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to:

determine information related to a sidelink traffic load in a first set of resources, wherein the apparatus is configured with an indication of the first set of resources and an indication of a second set of resources;

determine the sidelink traffic load in the first set of resources based, at least partially, on the determined information;

compare the information related to the sidelink traffic load with at least one threshold;

based on the determined sidelink traffic load and a result of the comparing the information related to the sidelink traffic load with the at least one threshold, determine a third set of resources for transmission; and

transmit, with one or more resources of the determined third set of resources, at least a message for initiating a sidelink discontinuous reception alignment procedure.

10. The apparatus of claim 9 , wherein the comparing the information related to the sidelink traffic load with the at least one threshold comprises the at least one memory and the computer program code are further configured to, with the at least one processor, cause the apparatus to compare the information related to the sidelink traffic load with a combination of at least one traffic load offset value and the at least one threshold.

11. The apparatus of claim 9 , wherein the determined third set of resources comprises at least the first set of resources and at least part of the second set of resources, where the at least one threshold is met or exceeded.

12. The apparatus of claim 9 , wherein comparing the information related to the sidelink traffic load with the at least one threshold comprises the at least one memory and the computer program code are further configured to, with the at least one processor, cause the apparatus to:

compare the determined sidelink traffic load with a plurality of thresholds of varied values of traffic load size, and

determine a largest value of the plurality of thresholds exceeded by the determined sidelink traffic load, wherein the plurality of thresholds are associated with respective subsets of resources belonging to the second set of resources,

wherein determining the third set of resources for transmission comprises the at least one memory and the computer program code are further configured to, with the at least one processor, cause the apparatus to determine one or more subsets of the second set of resources associated with the largest determined threshold.

13. The apparatus of claim 9 , wherein the information related to the sidelink traffic load comprises one of:

a channel busy ratio,

a message received from a different apparatus,

occupied resources of the first set of resources,

at least one received signal strength indicator for resources of the first set of resources,

a level of the sidelink traffic load in the first set of resources, or

a number of received physical layer signals or sequences.

14. An apparatus comprising:

at least one processor; and

at least one non-transitory memory and computer program code, wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to:

determine information related to a sidelink traffic load in a first set of resources, wherein the apparatus is configured with an indication of the first set of resources and an indication of a second set of resources;

determine the sidelink traffic load in the first set of resources based, at least partially, on the determined information;

based on the determined sidelink traffic load, determine a third set of resources for monitoring; and

monitor the third set of resources,

wherein the determined third set of resources comprises at least the first set of resources and at least one subset of the second set of resources, and

wherein the first set of resources are monitored to at least one of:

derive one or more signals or sequences, or

detect a part of a transmission for initiating the sidelink discontinuous reception alignment procedure,

wherein the at least one subset of the second set of resources are monitored to detect one of:

a full message for initiating the sidelink discontinuous reception alignment procedure, or

a different part of the transmission for initiating the sidelink discontinuous reception alignment procedure.

15. An apparatus comprising:

at least one processor; and

at least one non-transitory memory and computer program code, wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to:

determine information related to a sidelink traffic load in a first set of resources, wherein the apparatus is configured with an indication of the first set of resources and an indication of a second set of resources;

determine the sidelink traffic load in the first set of resources based, at least partially, on the determined information;

determine that the first set of resources are not configured to carry a full message for initiating a sidelink discontinuous reception alignment procedure;

based on the determined sidelink traffic load, determine a third set of resources for monitoring; and

monitor the third set of resources.

16. An apparatus comprising:

at least one processor; and

at least one non-transitory memory and computer program code, wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to:

determine information related to a sidelink traffic load in a first set of resources, wherein the apparatus is configured with an indication of the first set of resources and an indication of a second set of resources;

determine the sidelink traffic load in the first set of resources based, at least partially, on the determined information;

compare the information related to the sidelink traffic load with at least one threshold, wherein the comparing comprises comparing the information related to the sidelink traffic load with a combination of at least one traffic load offset value and the at least one threshold;

based on the determined sidelink traffic load and a result of the comparing the information related to the sidelink traffic load with the at least one threshold, determine a third set of resources for transmission; and

transmit, with one or more resources of the determined third set of resources, at least a message for initiating a sidelink discontinuous reception alignment procedure.

17. The apparatus of claim 16 , wherein the determined third set of resources comprises at least the first set of resources and at least part of the second set of resources, where the at least one threshold is met or exceeded.

18. The apparatus of claim 16 , wherein the comparing the information related to the sidelink traffic load with the at least one threshold comprises the at least one memory and the computer program code are further configured to, with the at least one processor, cause the apparatus to:

compare the determined sidelink traffic load with a plurality of thresholds of varied values of traffic load size, and

determine a largest value of the plurality of thresholds exceeded by the determined sidelink traffic load, wherein the plurality of thresholds are associated with respective subsets of resources belonging to the second set of resources,

wherein determining the third set of resources for transmission comprises the at least one memory and the computer program code are further configured to, with the at least one processor, cause the apparatus to determine one or more subsets of the second set of resources associated with the largest determined threshold.

19. The apparatus of claim 16 , wherein the information related to the sidelink traffic load comprises one of:

a channel busy ratio,

a message received from a different apparatus,

occupied resources of the first set of resources,

at least one received signal strength indicator for resources of the first set of resources,

a level of the sidelink traffic load in the first set of resources, or

a number of received physical layer signals or sequences.

20. The apparatus of claim 16 , wherein the apparatus is configured with the indication of the first set of resources and the indication of the second set of resources through at least one of:

pre-configuration of the apparatus,

dedicated signaling received with the apparatus, or

at least one broadcasted system information block received at the apparatus.