Wakeup signal based beam management
A method, an apparatus, and a computer program product for wireless communication are provided. The apparatus may transmit a plurality of repetitions of a cell-common wakeup signal (WUS) on a different transmit beam in each monitoring occasion of one or more monitoring occasions. Another apparatus may beam sweep receive beams in each monitoring occasion to receive the cell-common WUS and to identify a transmit beam/receive beam pair for receiving a paging communication in a paging occasion associated with the transmit beam.
1. A method of wireless communication performed by a user equipment (UE), comprising:
receiving, from a base station (BS) and using a plurality of receive beams, a plurality of repetitions of a cell-common wakeup signal (WUS), each repetition transmitted on a same transmit beam in a monitoring occasion;
identifying a beam pair based at least in part on the plurality of repetitions of the cell-common WUS,
wherein the beam pair includes the transmit beam and a receive beam of the plurality of receive beams; and
receiving, using the receive beam, a paging communication transmitted on the transmit beam.
2. The method of claim 1 , wherein the UE is operating in a radio resource control (RRC) idle mode.
3. The method of claim 1 , wherein the cell-common WUS is quasi-co-located with a synchronization signal block associated with the transmit beam.
4. The method of claim 1 , further comprising:
receiving, using the plurality of receive beams, another plurality of repetitions of the WUS transmitted on another transmit beam in another monitoring occasion; and
wherein identifying the beam pair comprises:
identifying the beam pair based at least in part on the other plurality of repetitions of the cell-common WUS.
5. The method of claim 4 , wherein the monitoring occasion and the other monitoring occasion are time-division multiplexed in a same radio frame.
6. The method of claim 1 , wherein the plurality of repetitions of the cell-common WUS and the paging communication are received in a same bandwidth part different than a bandwidth part of a synchronization signal block.
7. The method of claim 1 , wherein receiving the paging communication comprises:
receiving the paging communication in a paging occasion associated with the cell-common WUS,
wherein the paging occasion occurs at a time offset after the plurality of repetitions of the cell-common WUS.
8. The method of claim 7 , wherein the cell-common WUS is specific to the paging occasion and includes an indication to receive the paging communication.
9. The method of claim 7 , wherein the cell-common WUS is associated with one or more other paging occasions in a paging cycle;
wherein the method further comprises:
receiving, using the receive beam, a UE-specific WUS that includes an indication to receive the paging communication in the paging occasion; and
wherein receiving the paging communication transmitted on the transmit beam comprises:
receiving, using the receive beam, the paging communication transmitted on the transmit beam based at least in part on receiving the UE-specific WUS.
10. The method of claim 1 , wherein the cell-common WUS comprises at least one of:
a sequence mapped to a plurality of resource blocks in one or more orthogonal frequency division multiplexing symbols,
a single-port channel state information reference signal, or
a physical downlink channel based WUS.
11. A method of wireless communication performed by a base station (BS), comprising:
transmitting, using a first transmit beam, a first plurality of repetitions of a cell-common wakeup signal (WUS) in a first monitoring occasion;
transmitting, using a second transmit beam, a second plurality of repetitions of the cell-common WUS in a second monitoring occasion; and
transmitting a paging communication using the first transmit beam and the second transmit beam.
12. The method of claim 11 , wherein the cell-common WUS is quasi-co-located with a synchronization signal block associated with the first transmit beam.
13. The method of claim 11 , wherein the first monitoring occasion and the second monitoring occasion are time-division multiplexed in a same radio frame.
14. The method of claim 11 , wherein the first plurality of repetitions of the cell-common WUS is associated with a same downlink spatial domain transmission filter.
15. The method of claim 11 , wherein transmitting the first plurality of repetitions of the cell-common WUS in the first monitoring occasion comprises:
transmitting the first plurality of repetitions of the WUS in the first monitoring occasion based at least in part on determining to transmit the paging communication to a user equipment (UE).
16. The method of claim 11 , wherein transmitting the paging communication using the first transmit beam and the second transmit beam comprises:
transmitting the paging communication in a paging occasion associated with the cell-common WUS.
17. The method of claim 16 , wherein transmitting the paging communication in the paging occasion associated with the cell-common WUS comprises:
transmitting, using the first transmit beam, the paging communication in a first PDCCH monitoring occasion in the paging occasion; and
transmitting, using the second transmit beam, the paging communication in a second PDCCH monitoring occasion in the paging occasion,
wherein the first PDCCH monitoring occasion and the second PDCCH monitoring occasion are included in a same radio frame.
18. The method of claim 17 , wherein the first monitoring occasion is based at least in part on a time offset between the first monitoring occasion and a starting symbol of the paging occasion.
19. The method of claim 17 , wherein the first monitoring occasion is based at least in part on a time offset between the first monitoring occasion and a starting symbol of the first PDCCH monitoring occasion.
20. The method of claim 17 , wherein the cell-common WUS is specific to the paging occasion and includes an indication to receive the paging communication.
21. The method of claim 17 , wherein the WUS is associated with one or more other paging occasions in a paging cycle;
wherein the method further comprises:
transmitting a UE-specific WUS using the first transmit beam and the second transmit beam, the UE-specific WUS including an indication to receive the paging communication in the paging occasion; and
wherein transmitting the paging communication using the first transmit beam and the second transmit beam comprises:
transmitting, using the first transmit beam and the second transmit beam, the paging communication based at least in part on transmitting the UE-specific WUS.
22. The method of claim 11 , further comprising:
transmitting, using the first transmit beam, a third plurality of repetitions of the cell-common WUS,
wherein the first plurality of repetitions of the cell-common WUS is associated with a first paging occasion for a first UE, and
wherein the third plurality of repetitions of the cell-common WUS is associated with a second paging occasion for a second UE.
23. The method of claim 22 , wherein the first plurality of repetitions of the cell-common WUS is time division multiplexed with the third plurality of repetitions of the cell-common WUS.
24. The method of claim 22 , wherein the first plurality of repetitions of the cell-common WUS is frequency division multiplexed with the third plurality of repetitions of the cell-common WUS.
25. The method of claim 11 , wherein the cell-common WUS comprises at least one of:
a sequence mapped to a plurality of resource blocks in one or more orthogonal frequency division multiplexing symbols,
a single-port channel state information reference signal, or
a physical downlink channel based WUS.
26. A user equipment (UE) for wireless communication, comprising:
a memory; and
one or more processors coupled to the memory, the memory and the one or more processors configured to:
receive, from a base station (BS) and using a plurality of receive beams, a plurality of repetitions of a cell-common wakeup signal (WUS)), each repetition transmitted on a same transmit beam in a monitoring occasion;
identify a beam pair based at least in part on the plurality of repetitions of the cell-common WUS,
wherein the beam pair includes the transmit beam and a receive beam of the plurality of receive beams; and
receive, using the receive beam, a paging communication transmitted on the transmit beam.
27. The UE of claim 26 , wherein the one or more processors, when receiving the paging communication, are configured to:
receive the paging communication in a paging occasion associated with the cell-common WUS,
wherein the paging occasion occurs at a time offset after the plurality of repetitions of the cell-common WUS.
28. The UE of claim 27 , wherein the cell-common WUS is associated with one or more other paging occasions in a paging cycle;
wherein the one or more processors are further configured to:
receive, using the receive beam, a UE-specific WUS that includes an indication to receive the paging communication in the paging occasion; and
wherein the one or more processors, when receiving the paging communication transmitted on the transmit beam, are configured to:
receive, using the receive beam, the paging communication transmitted on the transmit beam based at least in part on receiving the UE-specific WUS.
29. A base station (BS) for wireless communication, comprising:
a memory; and
one or more processors coupled to the memory, the memory and the one or more processors configured to:
transmit, using a first transmit beam, a first plurality of repetitions of a cell-common wakeup signal (WUS) in a first monitoring occasion;
transmit, using a second transmit beam, a second plurality of repetitions of the WUS in a second monitoring occasion; and
transmit a paging communication using the first transmit beam and the second transmit beam.
30. The BS of claim 29 , wherein the one or more processors are further configured to:
transmit a UE-specific WUS using the first transmit beam and the second transmit beam; and
wherein the one or more processors, when transmitting the paging communication using the first transmit beam and the second transmit beam, are to:
transmit, using the first transmit beam and the second transmit beam, the paging communication based at least in part on transmitting the UE-specific WUS.