Beam sweeping during an on-period of a drx cycle

Patent metadata

Field	Value
Publication number	US-2020008261-A1
Application number	US-201916387853-A
Country	US
Kind code	A1
Filing date	Apr 18, 2019
Priority date	Jul 2, 2018
Publication date	Jan 2, 2020
Grant date	—

Abstract

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.

First claim

What is claimed is:

1 . A method for wireless communication, comprising:
transmitting, to a user equipment (UE)operating in a discontinuous reception (DRX) mode, a first set of signals using a first set of beams during a first on-period of a first DRX cycle associated with the UE; 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 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 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 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 signals are transmitted once in every N DRX on-periods.

5 . The method of claim 4 , wherein the second set of signals are transmitted during the remaining non-N 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 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:
refraining from transmitting the first set of signals during an off-period of the first DRX cycle based at least in part on transmitting the first set of signals during the first on-period of the first DRX cycle.

9 . The method of claim 1 , further comprising:
transmitting the first set of 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.

10 . The method of claim 1 , further comprising:
refraining from transmitting the first set of signals during an off-period adjacent the first on-period.

11 . The method of claim 1 , further comprising:
transmitting the second set of wake-up signals during the first on-period of the first DRX cycle based at least in part on transmitting the first set of 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 signals transmitted during the first on-period of the first DRX cycle, wherein transmitting the first set of 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 signals are transmitted during an on-period of the DRX cycle, wherein transmitting the first set of signals is based at least in part on identifying the first DRX cycle.

14 . The method of claim 1 , wherein the first set of signals are transmitted with a first set of gNB beams and the second set of signals are transmitted with a second set of gNB beams.

15 . The method of claim 1 , wherein the first set of 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 signals comprises a set of reference signals.

17 . The method of claim 1 , wherein the first set of 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 signals using a first set of beams during a first on-period of a first DRX cycle associated with the UE; 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 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 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 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 signals are received once in every N DRX on-periods.

23 . The method of claim 19 , wherein the second set of signals are received during the remaining non-N on-periods.

24 . The method of claim 19 , further comprising: receiving the first set of 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.

25 . The method of claim 19 , further comprising:
receiving the second set of wake-up signals during the first on-period of the first DRX cycle based at least in part on receiving the first set of signals during the first on-period of the first DRX cycle.

26 . The method of claim 19 , further comprising: identifying wake-up information encoded in at least one reference signal of the first set of signals transmitted during the first on-period of the first DRX cycle.

27 . The method of claim 19 , wherein the first set of 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 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 signals using a first set of beams during a first on-period of a first DRX cycle associated with the UE; 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 on-period being different from the fir

Assignees

• Qualcomm Inc

Inventors

• Islam Muhammad Nazmul
• Luo Tao
• Nam Wooseok
• Li Junyi
• Cezanne Juergen

Classifications

• H04W16/28

  using beam steering · CPC title

• H04W52/0216

  using a pre-established activity schedule, e.g. traffic indication frame · CPC title

• H04W76/28 Primary

  Discontinuous transmission [DTX]; Discontinuous reception [DRX] · CPC title

• H04B7/088

  using beam selection · CPC title

• H04B7/0617

  for beam forming · CPC title