Frame-based initiator device operation
Methods, systems, and devices for wireless communications are described that provide for frame-based initiator device operations. A wireless device may be operating within a frame-based equipment communications system, where a frame may include a channel occupancy time period and a minimum idle period. An initiating device may be configured to initiate autonomous uplink communications during the channel occupancy time period of its frame, while the device may not initiate communications during an idle period of its frame. In some cases, a frame-based equipment communications system may include more than one initiating device, where the idle periods for different initiating devices may occur at different times. In some cases, the initiating device may be configured to initiate communications during the idle period for another initiating device. This may allow the wireless system to decrease system overhead associated with a minimum idle period per frame.
1. A method for wireless communication, comprising:
determining a network device frame timing for communication initiated by a network device over a channel, the network device frame timing defining a duration of each of a plurality of network device-initiated frames, a starting time of the plurality of network device-initiated frames, or a combination thereof;
determining a device frame timing for communicating as an initiator device over the channel, the device frame timing defining a duration of each of a plurality of device-initiated frames, an offset of the plurality of device-initiated frames relative to the plurality of network device-initiated frames, or a combination thereof;
receiving, from the network device, a control transmission over the channel within a first network device-initiated frame, the control transmission indicating an availability of a first device-initiated frame of the plurality of device-initiated frames;
performing, based at least in part on the availability, a listen-before-talk (LBT) procedure over the channel prior to a starting time of the first device-initiated frame for an uplink transmission; and
transmitting the uplink transmission to the network device within the first device-initiated frame based at least in part on the LBT procedure.
2. The method of claim 1 , further comprising:
receiving, from the network device, a second control transmission over the channel within the first network device-initiated frame, the second control transmission comprising a grant for transmitting a network device-initiated uplink transmission or receiving a downlink transmission from the network device over a set of scheduled resources within the first network device-initiated frame.
3. The method of claim 2 , wherein the set of scheduled resources overlaps at least partially with an idle period preceding a second device-initiated frame of the plurality of device-initiated frames, the method further comprising:
refraining from transmitting during the second device-initiated frame.
4. The method of claim 1 , further comprising:
entering an idle mode of operation after transmitting the uplink transmission;
identifying data to be transmitted in a second uplink transmission;
identifying physical random access channel (PRACH) resources in the channel based at least in part on an access of the channel by the network device during the first network device-initiated frame; and
transmitting a PRACH to the network device based at least in part on the PRACH resources and the device frame timing.
5. The method of claim 1 , further comprising:
receiving, from the network device, a configuration for operation over a subset of frequency resources of the channel, wherein the LBT procedure and the uplink transmission are over the subset of frequency resources.
6. The method of claim 1 , wherein the channel is located in a shared radio frequency spectrum band.
7. The method of claim 1 , wherein the duration of each of the plurality of network device-initiated frames is longer than the duration of each of the plurality of device-initiated frames.
8. The method of claim 1 , wherein the duration of each of the plurality of network device-initiated frames is a multiple of the duration of each of the plurality of device-initiated frames.
9. The method of claim 1 , wherein the plurality of network device-initiated frames comprise respective idle periods.
10. The method of claim 9 , wherein the uplink transmission at least partially overlaps in time with one of the respective idle periods.
11. The method of claim 1 , wherein the uplink transmission comprises a scheduling request (SR), a physical random access channel (PRACH), a periodic channel state information (CSI) report, a semi-persistent CSI report, a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), or an autonomous uplink (AUL) transmission.
12. A method for wireless communication, comprising:
determining a network device frame timing for communicating with a plurality of devices over a channel, the network device frame timing defining a duration of each of a plurality of network device-initiated frames, a starting time of the plurality of network device-initiated frames, or a combination thereof;
configuring the plurality of devices with respective device frame timings for operation as initiator devices over the channel, each device frame timing defining a duration of each of a plurality of device-initiated frames, an offset of the plurality of device-initiated frames relative to the plurality of network device-initiated frames, or a combination thereof;
transmitting a control transmission over the channel within a first network device-initiated frame, the control transmission indicating an availability of the plurality of device-initiated frames; and
communicating with at least one of the plurality of devices based at least in part on the respective device frame timings.
13. The method of claim 12 , further comprising:
performing a listen-before-talk (LBT) procedure over the channel prior to the first network device-initiated frame of the plurality of network device-initiated frames; and
communicating, as an initiator device, with at least one of the plurality of devices within the first network device-initiated frame based at least in part on the LBT procedure.
14. The method of claim 13 , further comprising:
transmitting a second control transmission over the channel within the first network device-initiated frame, wherein the second control transmission comprises a grant of a set of scheduled resources for at least one of the plurality of devices for an uplink transmission or a downlink transmission.
15. The method of claim 13 , further comprising:
configuring physical random access channel (PRACH) resources in the channel based at least in part on the LBT procedure;
receiving a PRACH from an idle device over the PRACH resources; and
configuring the idle device with a device frame timing for operation as an initiator device over the channel.
16. The method of claim 12 , further comprising:
transmitting, to at least one of the plurality of devices, a configuration to operate over a subset of frequency resources of the channel.
17. The method of claim 12 , wherein the channel is located in a shared radio frequency spectrum band.
18. The method of claim 12 , wherein the duration of each of the plurality of network device-initiated frames is longer than the duration of each of the plurality of device-initiated frames.
19. The method of claim 12 , wherein the duration of each of the plurality of network device-initiated frames is a multiple of the duration of the plurality of device-initiated frames.
20. The method of claim 12 , wherein each of the plurality of network device-initiated frames comprises a respective idle period.
21. The method of claim 20 , wherein communicating with at least one of the plurality of devices comprises:
receiving an uplink transmission over a set of resources that at least partially overlaps in time with an idle period of the first network device-initiated frame of the plurality of network device-initiated frames.
22. The method of claim 12 , wherein communicating with at least one of the plurality of devices comprises:
receiving a scheduling request (SR), a physical random access channel (PRACH), a periodic channel state information (CSI) reporting, a semi-persistent CSI reporting, a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), or an autonomous uplink (AUL) transmission.
23. An apparatus for wireless communication, comprising:
a processor; and
memory coupled with the processor, wherein the memory comprises instructions executable by the processor to cause the apparatus to:
determine a network device frame timing for communication initiated by a network device over a channel, the network device frame timing defining a duration of each of a plurality of network device-initiated frames, a starting time of the plurality of network device-initiated frames, or a combination thereof;
determine a device frame timing for communicating as an initiator device over the channel, the device frame timing defining a duration of each of a plurality of device-initiated frames, an offset of the plurality of device-initiated frames relative to the plurality of network device-initiated frames, or a combination thereof;
receive, from the network device, a control transmission over the channel within a first network device-initiated frame, the control transmission indicating an availability of a first device-initiated frame of the plurality of device-initiated frames;
perform a listen-before-talk (LBT) procedure over the channel prior to a starting time of the first device-initiated frame for an uplink transmission; and
transmit the uplink transmission to the network device within the first device-initiated frame based at least in part on the LBT procedure.
24. The apparatus of claim 23 , wherein the instructions are further executable by the processor to cause the apparatus to:
receive, from the network device, a second control transmission over the channel within the first network device-initiated frame, the second control transmission comprising a grant for transmitting a network device-initiated uplink transmission or receiving a downlink transmission from the network device over a set of scheduled resources within the first network device-initiated frame.
25. The apparatus of claim 24 , wherein the set of scheduled resources overlaps at least partially with an idle period preceding a second device-initiated frame of the plurality of device-initiated frames, the instructions further executable by the processor to cause the apparatus to:
refrain from transmitting during the second device-initiated frame.
26. The apparatus of claim 23 , wherein the instructions are further executable by the processor to cause the apparatus to:
enter an idle mode of operation after transmitting the uplink transmission;
identify data to be transmitted in a second uplink transmission;
identify physical random access channel (PRACH) resources in the channel based at least in part on an access of the channel by the network device during the first network device-initiated frame; and
transmit a PRACH to the network device based at least in part on the PRACH resources and the device frame timing.
27. The apparatus of claim 23 , wherein the instructions are further executable by the processor to cause the apparatus to:
receive, from the network device, a configuration for operation over a subset of frequency resources of the channel, wherein the LBT procedure and the uplink transmission are over the subset of frequency resources.
28. The apparatus of claim 23 , wherein the channel is located in a shared radio frequency spectrum band.
29. An apparatus for wireless communication, comprising:
a processor; and
memory coupled with the processor, wherein the memory comprises instructions executable by the processor to cause the apparatus to:
determine a network device frame timing for communicating with a plurality of devices over a channel, the network device frame timing defining a duration of each of a plurality of network device-initiated frames, a starting time of the plurality of network device-initiated frames, or a combination thereof;
configure the plurality of devices with respective device frame timings for operation as initiator devices over the channel, each device frame timing defining a duration of each of a plurality of device-initiated frames, an offset of the plurality of device-initiated frames relative to the plurality of network device-initiated frames, or a combination thereof;
transmit a control transmission over the channel within a first network device-initiated frame, the control transmission indicating an availability of the plurality of device-initiated frames; and
communicate with at least one of the plurality of devices based at least in part on the respective device frame timings.
30. The apparatus of claim 29 , wherein the instructions are further executable by the processor to cause the apparatus to:
perform a listen-before-talk (LBT) procedure over the channel prior to the first network device-initiated frame of the plurality of network device-initiated frames; and
communicate, as an initiator device, with at least one of the plurality of devices within the first network device-initiated frame based at least in part on the LBT procedure.