Grant-free admission control to a shared channel

1. A method for wireless communication at a base station, comprising:

transmitting a priority level to a user equipment (UE), the priority level associated with an eligibility of the UE to obtain grant-free access to resources of a shared channel;

selecting an admission control parameter from a plurality of admission control parameters based at least in part on a collision rate within the resources of the shared channel, wherein the selected admission control parameter corresponds to the eligibility of the UE to obtain grant-free access to the resources of the shared channel;

transmitting the selected admission control parameter to configure the UE with the selected admission control parameter; and

communicating with one or more UEs over the shared channel based at least in part on the priority indication and the selected admission control parameter.

2. The method of claim 1 , wherein selecting the admission control parameter comprises:

detecting the collision rate within the resources of the shared channel, wherein the selected admission control parameter is based at least in part on the detected collision rate.

3. The method of claim 2 , wherein detecting the collision rate comprises:

determining a rate at which an energy level within the resources of the shared channel exceeds an energy threshold.

4. The method of claim 1 , further comprising:

detecting the collision rate within the resources of the shared channel;

adjusting the admission control parameter based at least in part on the detected collision rate; and

transmitting the adjusted admission control parameter to configure the UE with the adjusted admission control parameter.

5. The method of claim 1 , wherein:

the selected admission control parameter increases or decreases a quantity of UEs that are eligible to obtain grant-free access to the resources of the shared channel.

6. The method of claim 1 , wherein:

the selected admission control parameter prevents the UE from accessing at least some of the resources of the shared channel.

7. The method of claim 1 , wherein:

the selected admission control parameter permits the UE to access at least some of the resources of the shared channel.

8. The method of claim 1 , wherein transmitting the selected admission control parameter further comprises:

transmitting the selected admission control parameter on a common control channel.

9. The method of claim 8 , wherein:

the common control channel is common to a group of UEs that includes the UE.

10. The method of claim 9 , wherein:

the selected admission control parameter configures each UE within the group of UEs with the selected admission control parameter.

11. The method of claim 1 , wherein transmitting the selected admission control parameter further comprises:

transmitting the selected admission control parameter in a common control channel transporting a slot format indication or in a different common control channel.

12. The method of claim 1 , wherein transmitting the selected admission control parameter further comprises:

transmitting the selected admission control parameter in a payload of a downlink shared channel.

13. The method of claim 1 , wherein transmitting the selected admission control parameter further comprises:

transmitting the selected admission control parameter using radio resource control signaling.

14. The method of claim 1 , wherein:

the selected admission control parameter comprises at least one bit.

15. The method of claim 1 , wherein:

the plurality of admission control parameters correspond to a plurality of different groups of UEs being eligible to obtain grant-free access to the resources of the shared channel.

16. The method of claim 1 , further comprising:

selecting the priority level for the UE from a plurality of priority levels; and

transmitting the selected priority level to the UE, wherein a combination of the selected admission control parameter and the selected priority level controls the eligibility of the UE to obtain grant-free access to the resources of the shared channel.

17. The method of claim 1 , further comprising:

determining a service level for the UE from a plurality of service levels; and

transmitting the determined service level to the UE, wherein a combination of the selected admission control parameter and the determined service level controls the eligibility of the UE to obtain grant-free access to the resources of the shared channel.

18. A method for wireless communication, comprising:

receiving, at a user equipment (UE), an admission control parameter from a base station;

receiving, from the base station, a priority level for the UE;

determining an eligibility of the UE to obtain grant-free access to resources of a shared channel based at least in part on a comparison of the priority level and the admission control parameter; and

communicating with the base station based at least in part on the determined eligibility.

19. The method of claim 18 , wherein determining the eligibility of the UE to obtain grant-free access to the resources of the shared channel comprises:

determining a random number; and

comparing the random number with the admission control parameter, wherein the eligibility of the UE is based at least in part on the comparing.

20. The method of claim 19 , wherein determining the random number comprises:

determining a service level of a plurality of service levels; and

generating the random number based at least in part on the determined service level.

21. An apparatus for wireless communication, comprising:

a processor;

memory in electronic communication with the processor; and

instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:

transmit a priority level to a user equipment (UE), the priority level associated with an eligibility of the UE to obtain grant-free access to resources of a shared channel;

select an admission control parameter from a plurality of admission control parameters based at least in part on a collision rate within the resources of the shared channel, wherein the selected admission control parameter corresponds to the eligibility of the UE to obtain grant-free access to the resources of the shared channel;

transmit the selected admission control parameter to configure the UE with the selected admission control parameter; and

communicate with one or more UEs over the shared channel based at least in part on the priority indication and the admission control parameter.

22. The apparatus of claim 21 , wherein selecting the admission control parameter comprises instructions further executable by the processor to:

detect the collision rate within the resources of the shared channel, wherein the selected admission control parameter is based at least in part on the detected collision rate.

23. The apparatus of claim 21 , wherein the instructions are further executable by the processor to:

detect the collision rate within the resources of the shared channel;

adjust the admission control parameter based at least in part on the detected collision rate; and

transmit the adjusted admission control parameter to configure the UE with the adjusted admission control parameter.

24. The apparatus of claim 21 , wherein:

the selected admission control parameter prevents the UE from accessing at least some of the resources of the shared channel.

25. The apparatus of claim 21 , wherein:

the selected admission control parameter permits the UE to access at least some of the resources of the shared channel.

26. The apparatus of claim 21 , wherein the instructions are further executable by the processor to:

select the priority level for the UE from a plurality of priority levels; and

transmit the selected priority level to the UE, wherein a combination of the selected admission control parameter and the selected priority level controls the eligibility of the UE to obtain grant-free access to the resources of the shared channel.

27. The apparatus of claim 21 , wherein the instructions are further executable by the processor to:

determine a service level for the UE from a plurality of service levels; and

transmit the determined service level to the UE, wherein a combination of the selected admission control parameter and the determined service level controls the eligibility of the UE to obtain grant-free access to the resources of the shared channel.

28. An apparatus for wireless communication, comprising:

a processor;

memory in electronic communication with the processor; and

instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:

receive, at a user equipment (UE), an admission control parameter from a base station;

receive, from the base station, a priority level for the UE;

determine an eligibility of the UE to obtain grant-free access to resources of a shared channel based at least in part on a comparison of the priority level and the admission control parameter; and

communicate with the base station based at least in part on the determined eligibility.