Control channel design for shared wireless communications

1. A method for wireless communications at a user equipment (UE), comprising:

monitoring, in accordance with a first control monitoring pattern, for a downlink control channel from a network device in each transmission time interval of a first plurality of transmission time intervals, each transmission time interval of the first plurality of transmission time intervals having a first duration, wherein the first control monitoring pattern is associated with a first number of blind decodes for the UE;

receiving, from the network device while monitoring for the downlink control channel in accordance with the first control monitoring pattern, a physical downlink control channel comprising a switching indicator that indicates a switch from the first control monitoring pattern to a second control monitoring pattern that is different from the first control monitoring pattern and is associated with a second number of blind decodes for the UE, wherein the physical downlink control channel received while monitoring in accordance with the first control monitoring pattern indicates a number of another first plurality of transmission time intervals that is associated with the monitoring for the downlink control channel in accordance with the first control monitoring pattern before performing the switch;

performing the switch from the first control monitoring pattern to the second control monitoring pattern after a time period based at least in part on the physical downlink control channel, wherein the time period corresponds to the number of the another first plurality of transmission time intervals; and

monitoring, after performing the switch from the first control monitoring pattern to the second control monitoring pattern, for the downlink control channel from the network device in each transmission time interval of a second plurality of transmission time intervals in accordance with the second control monitoring pattern, each transmission time interval of the second plurality of transmission time intervals having a second duration that is different from the first duration.

2. The method of claim 1 , further comprising:

monitoring for the downlink control channel from the network device during a remaining portion of the first control monitoring pattern based at least in part on receiving the physical downlink control channel during a first portion of the first control monitoring pattern and the number of the another first plurality of transmission time intervals.

3. The method of claim 1 , wherein the second control monitoring pattern comprises a beginning of communications according to a second transmission mode.

4. The method of claim 1 , wherein the switching indicator indicates one or more of a beginning of communications according to the second control monitoring pattern or a continuation of communications according to the first control monitoring pattern.

5. The method of claim 1 , further comprising:

receiving a radio resource control (RRC) message from the network device, the RRC message comprising an indication of a fixed number of transmission time intervals for communications according to the first control monitoring pattern before the switch from the first control monitoring pattern to the second control monitoring pattern, wherein the number of the another first plurality of transmission time intervals that is associated with the monitoring for the downlink control channel in accordance with the first control monitoring pattern before performing the switch is based at least in part on the fixed number.

6. The method of claim 5 , further comprising:

receiving the physical downlink control channel from the network device before reaching an end of the fixed number of transmission time intervals; and

restarting a timer comprising the fixed number of transmission time intervals for communications according to the first control monitoring pattern based at least in part on receiving the physical downlink control channel before reaching the end of the fixed number of transmission time intervals.

7. The method of claim 1 , further comprising:

identifying a maximum number of blind decodes for the downlink control channel and a maximum number of control channel elements (CCEs) for the downlink control channel, wherein the maximum number of blind decodes and the maximum number of CCEs are distributed among transmission time intervals of the first control monitoring pattern.

8. The method of claim 7 , further comprising:

receiving the downlink control channel according to the first control monitoring pattern based at least in part on a first subset of the maximum number of blind decodes and a first subset of the maximum number of CCEs; and

receiving the downlink control channel according to the second control monitoring pattern based at least in part on a second subset of the maximum number of blind decodes and a second subset of the maximum number of CCEs.

9. The method of claim 1 , wherein one or both of the first control monitoring pattern and the second control monitoring pattern indicates a periodicity for monitoring for the downlink control channel.

10. A method for wireless communications at a network device, comprising:

monitoring a channel during a listen before talk procedure, the channel associated with communications between the network device and a user equipment (UE);

transmitting, based at least in part on the monitoring and in accordance with a first control monitoring pattern, a downlink control channel to the UE in each transmission time interval of a first plurality of transmission time intervals, each transmission time interval of the first plurality of transmission time intervals having a first duration, wherein the first control monitoring pattern is associated with a first number of control channel elements (CCEs) for the UE;

transmitting, to the UE, in accordance with the first control monitoring pattern, a physical downlink control channel comprising a switching indicator that indicates a switch from the first control monitoring pattern to a second control monitoring pattern that is different from the first control monitoring pattern and is associated with a second number of CCEs, wherein the physical downlink control channel transmitted in accordance with the first control monitoring pattern indicates a number of another first plurality of transmission time intervals that is associated with the transmitting in accordance with the first control monitoring pattern before the switch;

determining a time period before the switch from the first control monitoring pattern to the second control monitoring pattern, wherein the time period corresponds to the number of the another first plurality of transmission time intervals that is associated with the transmitting in accordance with the first control monitoring pattern before the switch; and

transmitting, after the time period and in accordance with the second control monitoring pattern, the downlink control channel to the UE in each transmission time interval of a second plurality of transmission time intervals, each transmission time interval of the second plurality of transmission time intervals having a second duration that is different from the first duration.

11. The method of claim 10 , wherein transmitting the downlink control channel further comprises: transmitting the downlink control channel during a remaining portion of the first control monitoring pattern based at least in part on transmitting the physical downlink control channel during a first portion of the first control monitoring pattern.

12. The method of claim 10 , wherein the second control monitoring pattern is subsequent the first control monitoring pattern and comprises a beginning of communications according to a second transmission mode.

13. The method of claim 10 , wherein the switching indicator indicates one or more of a beginning of communications according to the second control monitoring pattern or a continuation of communications according to the first control monitoring pattern.

14. The method of claim 10 , further comprising:

transmitting a radio resource control (RRC) message to the UE, the RRC message indicating a fixed number of transmission time intervals for communications according to the first control monitoring pattern before the switch from the first control monitoring pattern to the second control monitoring pattern, wherein the number of the another first plurality of transmission time intervals that is associated with the transmitting in accordance with the first control monitoring pattern before the switch is based at least in part on the fixed number.

15. The method of claim 10 , further comprising:

identifying a maximum number of CCEs for the downlink control channel, wherein the maximum number of CCEs are distributed among transmission time intervals of the first control monitoring pattern.

16. The method of claim 15 , further comprising:

transmitting the downlink control channel according to the first control monitoring pattern based at least in part on a first subset of the maximum number of CCEs; and

transmitting the downlink control channel according to the second control monitoring pattern subsequent the first control monitoring pattern based at least in part on a second subset of the maximum number of CCEs.

17. An apparatus for wireless communications at a user equipment (UE), comprising:

a processor;

memory coupled with the processor; and

instructions stored in the memory and executable by the processor to cause the apparatus to:

monitor, in accordance with a first control monitoring pattern, for a downlink control channel from a network device in each transmission time interval of a first plurality of transmission time intervals, each transmission time interval of the first plurality of transmission time intervals having a first duration, wherein the first control monitoring pattern is associated with a first number of blind decodes for the UE;

receive, from the network device while monitoring for the downlink control channel in accordance with the first control monitoring pattern, a physical downlink control channel comprising a switching indicator that indicates a switch from the first control monitoring pattern to a second control monitoring pattern that is different from the first control monitoring pattern and is associated with a second number of blind decodes for the UE, wherein the physical downlink control channel received while monitoring in accordance with the first control monitoring pattern indicates a number of another first plurality of transmission time intervals that is associated with the monitoring for the downlink control channel in accordance with the first control monitoring pattern before performing the switch;

perform the switch from the first control monitoring pattern to the second control monitoring pattern after a time period based at least in part on the physical downlink control channel, wherein the time period corresponds to the number of the another first plurality of transmission time intervals; and

monitor, after performing the switch from the first control monitoring pattern to the second control monitoring pattern, for the downlink control channel from the network device in each transmission time interval of a second plurality of transmission time intervals in accordance with the second control monitoring pattern, each transmission time interval of the second plurality of transmission time intervals having a second duration that is different from the first duration.

18. The apparatus of claim 17 , wherein the switching indicator indicates one or more of a beginning of communications according to the second control monitoring pattern or a continuation of communications according to the first control monitoring pattern.

19. The apparatus of claim 17 , wherein one or both of the first control monitoring pattern and the second control monitoring pattern indicates a periodicity for monitoring for the downlink control channel.

20. The apparatus of claim 17 , wherein the instructions are further executable by the apparatus to:

receive a radio resource control (RRC) message from the network device, the RRC message comprising an indication of a fixed number of transmission time intervals for communications according to the first control monitoring pattern before the switch from the first control monitoring pattern to the second control monitoring pattern, wherein the number of the another first plurality of transmission time intervals that is associated with the monitoring for the downlink control channel in accordance with the first control monitoring pattern before performing the switch is based at least in part on the fixed number.

21. An apparatus for wireless communications at a network device, comprising:

a processor;

memory coupled with the processor; and

instructions stored in the memory and executable by the processor to cause the apparatus to:

monitor a channel during a listen before talk procedure, the channel associated with communications between the network device and a user equipment (UE);

transmit, based at least in part on the monitoring and in accordance with a first control monitoring pattern, a downlink control channel to the UE in each transmission time interval of a first plurality of transmission time intervals, each transmission time interval of the first plurality of transmission time intervals having a first duration, wherein the first control monitoring pattern is associated with a first number of control channel elements (CCEs) for the UE;

transmit, to the UE, in accordance with the first control monitoring pattern, a physical downlink control channel comprising a switching indicator that indicates a switch from the first control monitoring pattern to a second control monitoring pattern that is different from the first control monitoring pattern and is associated with a second number of CCEs, wherein the physical downlink control channel transmitted in accordance with the first control monitoring pattern indicates a number of another first plurality of transmission time intervals that is associated with the transmitting in accordance with the first control monitoring pattern before the switch;

determine a time period before the switch from the first control monitoring pattern to the second control monitoring pattern, wherein the time period corresponds to the number of the another first plurality of transmission time intervals that is associated with the transmitting in accordance with the first control monitoring pattern before the switch; and

transmit, after the time period and in accordance with the second control monitoring pattern, the downlink control channel to the UE in each transmission time interval of a second plurality of transmission time intervals, each transmission time interval of the second plurality of transmission time intervals having a second duration that is different from the first duration.

22. The apparatus of claim 21 , wherein the switching indicator indicates one or more of a beginning of communications according to the second control monitoring pattern or a continuation of communications according to the first control monitoring pattern.

23. The apparatus of claim 21 , wherein one or both of the first control monitoring pattern and the second control monitoring pattern indicates a periodicity for monitoring for the downlink control channel.

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

transmit, to the UE, a radio resource control (RRC) message comprising an indication of a fixed number of transmission time intervals for communications according to the first control monitoring pattern before the switch from the first control monitoring pattern to the second control monitoring pattern, wherein the number of the another first plurality of transmission time intervals that is associated with the monitoring for the downlink control channel in accordance with the first control monitoring pattern before performing the switch is based at least in part on the fixed number.