Beam sweeping during an on-period of a DRX cycle
Techniques are described herein for periodically transmitting a first set of signals (e.g., reference signals) during an on-period of a discontinuous reception (DRX) cycle rather than during an off-period of the DRX cycle. Such techniques may enable a user equipment (UE) operating in a DRX mode to conserve additional power during the DRX cycle. A periodicity for transmitting the first set of signals during the on-period may be determined. The periodicity may indicate that every one-in-N DRX cycles, the first set of signals are to be transmitted during the on-period. During other DRX cycles, the first set of signals may be transmitted during the off-period. When the first set of signals are transmitted during the on-period, the UE may refrain from activating certain components during the off-period, thereby conserving power.
1. A method for wireless communication, comprising:
transmitting, to a user equipment (UE) operating in a discontinuous reception (DRX) mode, a first set of wake-up signals using a first set of beams during a first on-period of a first DRX cycle associated with the UE, the first set of beams selected as part of a first beam sweep procedure during a first off-period of the first DRX cycle; and
transmitting, to the UE, a second set of wake-up signals using a second set of beams during a second on-period of a second DRX cycle associated with the UE, the second set of beams selected as part of a second beam sweep procedure during a second off-period of the second DRX cycle, the second on-period being different from the first on-period.
2. The method of claim 1 , further comprising:
receiving, from the UE, status information about the UE, wherein transmitting the first set of wake-up signals is based at least in part on receiving the status information.
3. The method of claim 2 , further comprising:
identifying a periodicity of the first set of wake-up signals and the second set of wake-up signals based at least in part on receiving the status information.
4. The method of claim 1 , wherein the first set of wake-up signals are transmitted once in every N DRX on-periods, wherein N is an integer that is two or more.
5. The method of claim 4 , wherein the second set of wake-up signals are transmitted during non-N DRX on-periods.
6. The method of claim 1 , further comprising:
randomizing an order of the first set of beams transmitted during the first on-period of the first DRX cycle across one or more cells, wherein transmitting the first set of wake-up signals is based at least in part on randomizing the order.
7. The method of claim 6 , wherein:
randomization of the first set of beams is based at least in part on a cell identifier, a UE identifier, or a UE group identifier, or a combination thereof.
8. The method of claim 1 , further comprising:
performing a third beam sweep procedure during a third on-period of a third DRX cycle associated with the UE and refraining from transmitting a third set of wake-up signals during an a third off-period of the third DRX cycle based at least in part on transmitting the first set of wake-up signals and the second set of wake-up signals.
9. The method of claim 1 , further comprising:
transmitting the first set of wake-up signals once in every M DRX off-periods based at least in part on transmitting the second set of wake-up signals during the second on-period of the second DRX cycle, wherein M is a positive integer.
10. The method of claim 1 , further comprising:
refraining from transmitting the first set of wake-up signals during an off-period adjacent a third on-period.
11. The method of claim 1 , further comprising:
transmitting the second set of wake-up signals during the second on-period of the second DRX cycle based at least in part on transmitting the first set of wake-up signals during the first on-period of the first DRX cycle.
12. The method of claim 1 , further comprising:
encoding wake-up information into at least one reference signal of the first set of wake-up signals transmitted during the first on-period of the first DRX cycle, wherein transmitting the first set of wake-up signals during the first on-period of the first DRX cycle is based at least in part on encoding the wake-up information into the at least one reference signal.
13. The method of claim 1 , further comprising:
identifying the first DRX cycle as a DRX cycle where the first set of wake-up signals are transmitted during an on-period of the DRX cycle, wherein transmitting the first set of wake-up signals is based at least in part on identifying the first DRX cycle.
14. The method of claim 1 , wherein the first set of wake-up signals are transmitted with a first set of giga-nodeB (gNB) beams and the second set of wake-up signals are transmitted with a second set of gNB beams.
15. The method of claim 1 , wherein the first set of wake-up signals comprises channel state information reference signals (CSI-RSs), primary synchronization signals (PSSs), secondary synchronization signals (SSSs), demodulation reference signals (DMRSs) of physical broadcast channels (PBCHs), or tracking reference signals, or a combination thereof.
16. The method of claim 1 , wherein the first set of wake-up signals comprises a set of reference signals.
17. The method of claim 1 , wherein the first set of wake-up signals comprises a physical downlink control channel (PDCCH) with one or more cyclic redundancy check (CRC) bits scrambled using a radio network temporary identifier (RNTI) associated with the UE.
18. The method of claim 1 , wherein the UE is in a connected discontinuous reception (C-DRX) mode.
19. A method for wireless communication, comprising:
receiving, by a user equipment (UE) operating in a discontinuous reception (DRX) mode, a first set of wake-up signals using a first set of beams during a first on-period of a first DRX cycle associated with the UE, the first set of beams selected as part of a first beam sweep procedure during a first off-period of the first DRX cycle; and
receiving, by the UE, a second set of wake-up signals using a second set of beams during a second on-period of a second DRX cycle associated with the UE, the second set of beams selected as part of a second beam sweep procedure during a second off-period of the second DRX cycle, the second on-period being different from the first on-period.
20. The method of claim 19 , further comprising:
transmitting, by the UE, status information about the UE, wherein receiving the first set of wake-up signals is based at least in part on transmitting the status information.
21. The method of claim 20 , further comprising:
identifying a periodicity of the first set of wake-up signals and the second set of wake-up signals based at least in part on transmitting the status information.
22. The method of claim 19 , wherein the first set of wake-up signals are received once in every N DRX on-periods, wherein N is an integer that is two or more.
23. The method of claim 22 , wherein the second set of wake-up signals are received during non-N DRX on-periods.
24. The method of claim 19 , further comprising:
receiving the first set of wake-up signals once in every M DRX off-periods based at least in part on receiving the second set of wake-up signals during the second on-period of the second DRX cycle, wherein M is a positive integer.
25. The method of claim 19 , further comprising:
receiving a third set of wake-up signals during a third on-period of a third DRX cycle and refraining from monitoring for the third set of wake-up signals during a third off-period of the third DRX cycle based at least in part on receiving the first set of wake-up signals and the second set of wake-up signals.
26. The method of claim 19 , further comprising:
identifying wake-up information encoded in at least one reference signal of the first set of wake-up signals transmitted during the first on-period of the first DRX cycle.
27. The method of claim 19 , wherein the first set of wake-up signals comprises a physical downlink control channel (PDCCH) with one or more cyclic redundancy check (CRC) bits scrambled using a radio network temporary identifier (RNTI) associated with the UE.
28. The method of claim 19 , wherein the first set of wake-up signals comprises channel state information reference signals (CSI-RSs), primary synchronization signals (PSSs), secondary synchronization signals (SSSs), demodulation reference signals (DMRSs) of physical broadcast channels (PBCHs), or tracking reference signals, or a combination thereof.
29. An apparatus for wireless communication, comprising:
a processor,
memory in electronic communication with the processor; and
instructions stored in the memory and executable by the processor to cause the apparatus to:
transmit, to a user equipment (UE) operating in a discontinuous reception (DRX) mode, a first set of wake-up signals using a first set of beams during a first on-period of a first DRX cycle associated with the UE, the first set of beams selected as part of a first beam sweep procedure during a first off-period of the first DRX cycle; and
transmit, to the UE, a second set of wake-up signals using a second set of beams during a second on-period of a second DRX cycle associated with the UE, the second set of beams selected as part of a second beam sweep procedure during a second off-period of the second DRX cycle, the second on-period being different from the first on-period.
30. An apparatus for wireless communication, comprising:
a processor,
memory in electronic communication with the processor; and
instructions stored in the memory and executable by the processor to cause the apparatus to:
receive, by a user equipment (UE) operating in a discontinuous reception (DRX) mode, a first set of wake-up signals using a first set of beams during a first on-period of a first DRX cycle associated with the UE, the first set of beams selected as part of a first beam sweep procedure during a first off-period of the first DRX cycle; and
receive, by the UE, a second set of wake-up signals using a second set of beams during a second on-period of a second DRX cycle associated with the UE, the second set of beams selected as part of a second beam sweep procedure during a second off-period of the second DRX cycle, the second on-period being different from the first on-period.