Methods and apparatus for a group wake up signal

1. A method of wireless communication at a user equipment (UE) comprising:

transmitting paging capability information indicating that the UE supports group wake-up signals (WUSs) for paging occasions;

receiving, from a base station, an allocation of resources assigned to one or more sub-group UEs in a UE group, wherein the one or more sub-group UEs include the UE, wherein a first amount of the one or more sub-group UEs is less than a second amount of UEs in the UE group; and

listening for a wake-up signal (WUS) from the base station in the resources for the UE group for the one or more sub-group UEs assigned to the UE group to wake-up for a paging occasion (PO), the WUS for the UE group being separated from a non-group specific WUS in a time domain based on a timing relation.

2. The method of claim 1 , wherein the resources for the UE group indicate the UE group for which the WUS is transmitted.

3. The method of claim 1 , wherein the resources for the UE group are identified by at least one of time resources, frequency resources, sequences, or power allocated for WUS transmission.

4. The method of claim 1 , further comprising:

receiving, from the base station, the WUS for the UE group indicating to the one or more sub-group UEs to wake-up for the PO; and

waking up for the PO for the UE group of one or more of the sub-group UEs in response to receiving the WUS.

5. The method of claim 1 , wherein the WUS for the UE group comprises a WUS duration length which does not exceed a maximum WUS duration for the non-group specific WUS.

6. The method of claim 1 , further comprising:

determining a starting time offset of the WUS for the UE group based on an indication received from the base station, wherein the WUS for the UE group is time division multiplexed with at least one other WUS.

7. The method of claim 1 , wherein the WUS for the UE group is code division multiplexed with at least one other WUS.

8. The method of claim 1 , further comprising:

determining a frequency offset for a starting resource block of the WUS for the UE group based on an indication received from the base station, wherein the WUS for the UE group is frequency division multiplexed with at least one other WUS.

9. The method of claim 1 , wherein the WUS for the UE group comprises a group specific WUS, wherein the UE listens for the group specific WUS without listening for the non-group specific WUS, wherein the group specific WUS for the UE group and the non-group specific WUS have different starting points, and wherein a starting point for the group specific WUS is based on at least one of a number of groups of UEs and a maximum WUS duration.

10. The method of claim 1 , further comprising:

listening for the non-group specific WUS from the base station, wherein the non-group specific WUS indicates for one or more UEs that are not capable of UE grouping to wake-up for the PO,

wherein the UE wakes-up for the PO when either the non-group specific WUS or the WUS for the UE group is received from the base station.

11. The method of claim 10 , wherein the UE listens for the WUS for the UE group with different resources than that of the non-group specific WUS.

12. The method of claim 1 , wherein the UE listens for the WUS for the UE group without listening for an additional WUS, wherein when the UE listens for the WUS for the UE group in same resources with UEs that do not have UE grouping capability the UE listens for the non-group specific WUS.

13. The method of claim 1 , further comprising:

selecting a paging carrier from a plurality of carriers, wherein said plurality of carriers comprise one or more WUS-enabled carriers and one or more non-WUS-enabled carriers,

wherein the paging carrier is selected based on whether the UE supports the WUS.

14. The method of claim 1 , further comprising:

selecting a paging carrier from a plurality of carriers that comprise one or more WUS-enabled carriers and one or more non-WUS-enabled carriers,

wherein the paging carrier is selected from either the one or more WUS-enabled carriers or the one or more non-WUS-enabled carriers based on whether the UE supports the WUS.

15. The method of claim 1 , further comprising:

selecting a paging carrier from a plurality of carriers, wherein said plurality of carriers comprise one or more group-specific WUS carriers and one or more non-grouping WUS carriers,

wherein the paging carrier is selected based on whether the UE supports UE grouping.

16. The method of claim 1 , wherein the one or more sub-group UEs in the UE group are assigned resources for a group WUS based on a time gap between the WUS for the one or more sub-group UEs and the PO.

17. The method of claim 1 , wherein the WUS is a first WUS, and the base station configures a different time between the PO and a second WUS for one sub-group and a third WUS for another sub-group.

18. The method of claim 1 , wherein the base station transmits the WUS for a first sub-group using a different sequence than a second WUS for a second sub-group.

19. The method of claim 1 , wherein the one or more sub-group UEs use two or more multiplexing schemes, wherein a different number of multiplexing schemes is used if a number of one or more sub-group UEs exceeds a threshold value.

20. The method of claim 1 , further comprising:

shifting a time period until the PO for at least one of the one or more sub-group UEs, wherein the time period until the PO is shifted using a predefined pattern selected based on a timing of the PO.

21. The method of claim 1 , wherein the one or more sub-group UEs include a first group of UEs and a second group of UEs, wherein the WUS for the first group of UEs comprises at least one of the non-group specific WUS, a first common WUS, or a first group WUS, wherein the WUS for the second group of UEs comprises at least one of a second common WUS or a second group WUS.

22. The method of claim 21 , wherein the non-group specific WUS indicates at least one first UE without a grouping capability or a first set of multiple UEs from different sub-groups within the first group of UEs to wake-up for the PO, wherein the first common WUS indicates a second set of multiple UEs from different sub-groups within the first group of UEs to wake-up for the PO without indicating for a different capability UE without the grouping capability to wake-up, wherein the first group WUS indicates at least one second UE from a first, single sub-group in the first group of UEs to wake-up for the PO, wherein the second common WUS indicates for third set of multiple UEs from different sub-groups in the second group of UEs to wake-up for the PO, wherein the second group WUS indicates for at least one third UE from a second, single sub-group within the second group of UEs to wake-up for the PO.

23. The method of claim 21 , wherein the first group of UEs are assigned a first group WUS sequence based on at least a first UE ID, a first weighting factor, and a first sub-group number for first group UEs, and the second group of UEs are assigned a second group WUS sequence based on at least a second UE ID, a second weighting factor, and a second sub-group number for second group UEs.

24. The method of claim 23 , wherein the first group of UEs, the second group of UEs, the first weighting factor, or the second weighting factor are fixed or predefined based on at least a first system information (SI) parameter, wherein the first sub-group number for the first group of UEs or the second sub-group number for the second group of UEs are fixed or predefined based on at least a second SI parameter, wherein the first common WUS for sub-group UEs in the first group of UEs or the second common WUS for sub-group UEs in the second group of UEs are fixed or predefined based on at least a third SI parameter.

25. The method of claim 1 , wherein the WUS for the UE group and the non-group specific WUS are staggered and transmitted at different time periods.

26. The method of claim 1 , wherein a first time gap between the WUS for the UE group and the PO is greater than or equal to a second time gap between the non-group specific WUS and the PO.

27. The method of claim 26 , wherein the first time gap is larger than the second time gap.

28. The method of claim 1 , wherein the non-group specific WUS is configured for multiple UEs.

29. A method of wireless communication at a base station comprising:

receiving paging capability information indicating group wake-up signals (WUSs) for paging occasions capabilities of a plurality of user equipments (UEs);

grouping, based on the paging capability information, the plurality of UEs into a plurality of UE groups; and

transmitting a WUS in an allocation of resources for a UE group from among the plurality of UE groups, the allocation of resources being assigned to one or more sub-group UEs in the UE group, wherein a first amount of the one or more sub-group UEs is less than a second amount of UEs in the UE group, the WUS for the UE group being separated from a non-group specific WUS in a time domain based on a timing relation.

30. The method of claim 29 , further comprising:

indicating an assignment to one of the plurality of UE groups to each of the plurality of UEs, wherein the assignment to one of the plurality of UE groups is indicated with the resources.

31. The method of claim 29 , wherein the WUS for the UE group comprises a WUS duration length which does not exceed a maximum WUS duration for the non-group specific WUS.

32. The method of claim 29 , further comprising:

indicating a starting time offset of the WUS for the UE group, wherein the WUS for the UE group is time division multiplexed with at least one other WUS for an additional UE group from among the plurality of UE groups.

33. The method of claim 29 , further comprising:

indicating a frequency offset for a starting resource block of the WUS for the UE group based on one of an implicit indication and an explicit indication received, wherein the WUS for the UE group is frequency division multiplexed with at least one other WUS for an additional UE group from among the plurality of UE groups.

34. The method of claim 29 , wherein the WUS for the UE group is transmitted to wake-up one or more grouping UEs for a first paging occasion (PO), the method further comprising:

transmitting the non-group specific WUS to wake-up one or more legacy UEs for a second PO, wherein the one or more sub-group UEs support UE grouping and the one or more legacy UEs do not support group specific WUSs, wherein each of the plurality of UE groups comprises at least one grouping UEs and at least one legacy UEs.

35. The method of claim 29 , wherein a first UE group comprises one or more legacy UEs and at least one remaining UE group comprises one or more grouping UEs, the method further comprising:

transmitting the non-group specific WUS to wake-up UEs from more than one UE group.

36. The method of claim 29 , wherein a first UE group comprises one or more legacy UEs and at least one remaining UE group comprises one or more grouping UEs,

wherein a group-specific WUS corresponding to the at least one remaining UE group and the non-group specific WUS corresponding to the first UE group have different starting points.

37. The method of claim 29 , further comprising:

balancing an amount of one or more grouping UEs and one or more legacy UEs in each of the plurality of UE groups,

wherein the balancing is based on one or more weighting factors.

38. The method of claim 29 , wherein a paging carrier is selected from a plurality of carriers, wherein said plurality of carriers comprise one or more WUS-enabled carriers and one or more non-WUS-enabled carriers,

wherein the paging carrier for a UE is selected based on whether the UE supports the WUS.

39. The method of claim 29 , wherein the one or more sub-group UEs in the UE group are assigned a group WUS sequence based on a time gap between the WUS for the one or more sub-group UEs and a paging occasion (PO).

40. The method of claim 29 , wherein the WUS is a first WUS, and further comprising:

configuring a different time between a paging occasion (PO) and a second WUS for one sub-group and a third WUS for another sub-group.

41. The method of claim 29 , wherein the WUS is associated with a first WUS and a second WUS, and wherein at least a first portion of the first WUS for one sub-group overlaps with at least a second portion of the second WUS for a second sub-group, the method further comprising:

boosting a power to an overlapping region comprising the first portion of the first WUS for the one sub-group and the second portion of the second WUS for the second sub-group; and

transmitting the first WUS for the one sub-group using a different sequence than the second WUS for the second sub-group.

42. The method of claim 29 , further comprising:

shifting a time period until a paging occasion (PO) for at least one of the plurality of UE groups, wherein the time period until the PO is shifted using predefined patterns selected based on a timing of the PO.

43. The method of claim 29 , wherein the plurality of UE groups includes a first group of UEs and a second group of UEs, wherein the WUS for the first group of UEs comprises at least one of the non-group specific WUS, a first common WUS, or a first group WUS, wherein the WUS for the second group of UEs comprises at least one of a second common WUS or a second group WUS.

44. The method of claim 29 , wherein the WUS for the UE group and the non-group specific WUS are staggered and transmitted at different time periods.

45. The method of claim 29 , wherein a first time gap between the WUS for the UE group and a paging occasion (PO) is greater than or equal to a second time gap between the non-group specific WUS and the PO.

46. An apparatus for wireless communication at a user equipment (UE), comprising:

means for transmitting paging capability information indicating that the UE supports group WUSs for paging occasions;

means for receiving, from a base station, an allocation of resources assigned to one or more sub-group UEs in a UE group, wherein the one or more sub-group UEs include the UE, wherein a first amount of the one or more sub-group UEs is less than a second amount of UEs in the UE group; and

means for listening for a wake-up signal (WUS) from the base station in the resources for the UE group for the one or more sub-group UEs assigned to the UE group to wake-up for a paging occasion (PO), the WUS for the UE group being separated from a non-group specific WUS in a time domain based on a timing relation.

47. The apparatus of claim 46 , further comprising:

means for receiving, from the base station, the WUS for the UE group indicating to the one or more sub-group UEs to wake-up for the PO; and

means for waking up, for the PO for the UE group, one or more of the sub-group UEs in response to receiving the WUS.

48. The apparatus of claim 46 , further comprising:

means for determining a starting time offset of the WUS for the UE group based on an indication received from the base station, wherein the WUS for the UE group is time division multiplexed with at least one other WUS.

49. The apparatus of claim 46 , further comprising:

means for determining a frequency offset for a starting resource block of the WUS for the UE group based on an indication received from the base station, wherein the WUS for the UE group is frequency division multiplexed with at least one other WUS.

50. The apparatus of claim 46 , further comprising:

means for listening for the non-group specific WUS from the base station, wherein the non-group specific WUS indicates for one or more UEs that are not capable of UE grouping to wake-up for the PO,

wherein the UE wakes-up for the PO when either the non-group specific WUS or the WUS for the UE group is received from the base station.

51. The apparatus of claim 46 , further comprising:

means for shifting a time period until the PO for at least one of the one or more sub-group UEs.

52. An apparatus for wireless communication, comprising:

means for receiving paging capability information indicating group WUSs for paging occasions capabilities of a plurality of user equipments (UEs);

means for grouping, based on the paging capability information, the plurality of UEs into a plurality of UE groups; and

means for transmitting a WUS in an allocation of resources for a UE group from among the plurality of UE groups, the allocation of resources being assigned to one or more sub-group UEs in the UE group, wherein a first amount of the one or more sub-group UEs is less than a second amount of UEs in the UE group, the WUS for the UE group being separated from a non-group specific WUS in a time domain based on a timing relation.

53. The apparatus of claim 52 , further comprising:

means for indicating an assignment to one of the plurality of UE groups to each of the plurality of UEs, wherein the assignment to one of the plurality of UE groups is indicated with the resources.

54. The apparatus of claim 52 , further comprising:

means for indicating a frequency offset for a starting resource block of the WUS for the UE group based on one of an implicit indication and an explicit indication received, wherein the WUS for the UE group is frequency division multiplexed with at least one other WUS for an additional UE group.

55. The apparatus of claim 52 , further comprising:

means for transmitting the non-group specific WUS to wake-up one or more legacy UEs for a paging occasion (PO).

56. The apparatus of claim 52 , further comprising:

means for balancing an amount of one or more grouping UEs and one or more legacy UEs in each of the plurality of UE groups,

wherein the balancing is based on one or more weighting factors.

57. The apparatus of claim 52 , wherein the WUS is a first WUS, and further comprising:

means for configuring a different time between a paging occasion (PO) and a second WUS for one sub-group and a third WUS for another sub-group.

58. The apparatus of claim 52 , further comprising:

means for boosting a power to an overlapping region comprising a first portion of the WUS for one sub-group and a second portion of a second WUS for a second sub-group; and

means for transmitting the WUS for the one sub-group using a different sequence than the second WUS for the second sub-group.

59. An apparatus for wireless communication at a user equipment (UE), comprising:

memory; and

at least one processor coupled to the memory and configured to:

transmit paging capability information indicating that the UE supports group WUSs for paging occasions;

receive, from a base station, an allocation of resources assigned to one or more sub-group UEs in a UE group, wherein the one or more sub-group UEs include the UE, wherein a first amount of the one or more sub-group UEs is less than a second amount of UEs in the UE group; and

listen for a wake-up signal (WUS) from the base station in the resources for the UE group for the one or more sub-group UEs assigned to the UE group to wake-up for a paging occasion (PO), the WUS for the UE group being separated from a non-group specific WUS in a time domain based on a timing relation.

60. The apparatus of claim 59 , wherein the at least one processor is further configured to:

receive, from the base station, the WUS for the UE group indicating to the one or more sub-group UEs to wake-up for the PO; and

wake up, for the PO for the UE group, one or more of the sub-group UEs in response to receiving the WUS.

61. The apparatus of claim 59 , wherein the at least one processor is further configured to:

determine a starting time offset of the WUS for the UE group based on an indication received from the base station, wherein the WUS for the UE group is time division multiplexed with at least one other WUS.

62. The apparatus of claim 59 , wherein the at least one processor is further configured to:

determine a frequency offset for a starting resource block of the WUS for the UE group based on an indication received from the base station, wherein the WUS for the UE group is frequency division multiplexed with at least one other WUS.

63. The apparatus of claim 59 , wherein the at least one processor is further configured to:

listen for the non-group specific WUS from the base station, wherein the non-group specific WUS indicates for one or more UEs that are not capable of UE grouping to wake-up for the PO,

wherein the UE wakes-up for the PO when either the non-group specific WUS or the WUS for the UE group is received from the base station.

64. The apparatus of claim 59 , wherein the at least one processor is further configured to:

shift a time period until the PO for at least one of the one or more sub-group UEs.

65. The apparatus of claim 59 , wherein the WUS for the UE group and the non-group specific WUS are staggered and transmitted at different time periods.

66. The apparatus of claim 59 , wherein a first time gap between the WUS for the UE group and the PO is greater than or equal to a second time gap between the non-group specific WUS and the PO.

67. The apparatus of claim 66 , wherein the first time gap is larger than the second time gap.

68. An apparatus for wireless communication, comprising:

memory; and

at least one processor coupled to the memory and configured to:

receive paging capability information indicating group WUSs for paging occasions capabilities of a plurality of user equipments (UEs);

group, based on the paging capability information, the plurality of UEs into a plurality of UE groups; and

transmit a WUS in an allocation of resources for a UE group from among the plurality of UE groups, the allocation of resources being assigned to one or more sub-group UEs in the UE group, wherein a first amount of the one or more sub-group UEs is less than a second amount of UEs in the UE group, the WUS for the UE group being separated from a non-group specific WUS in a time domain based on a timing relation.

69. The apparatus of claim 68 , wherein the at least one processor is further configured to:

indicate an assignment to one of the plurality of UE groups to each of the plurality of UEs, wherein the assignment to one of the plurality of UE groups is indicated with the resources.

70. The apparatus of claim 68 , wherein the at least one processor is further configured to:

indicate a frequency offset for a starting resource block of the WUS for the UE group based on one of an implicit indication and an explicit indication received, wherein the WUS for the UE group is frequency division multiplexed with at least one other WUS for an additional UE group.

71. The apparatus of claim 68 , wherein the at least one processor is further configured to:

transmit the non-group specific WUS to wake-up one or more legacy UEs for a paging occasion (PO).

72. The apparatus of claim 68 , wherein the at least one processor is further configured to:

balance an amount of one or more grouping UEs and one or more legacy UEs in each of the plurality of UE groups,

wherein the balance is based on one or more weighting factors.

73. The apparatus of claim 68 , wherein the WUS is a first WUS, and the at least one processor is further configured to:

configure a different time between a paging occasion (PO) and a second WUS for one sub-group and a third WUS for another sub-group.

74. The apparatus of claim 68 , wherein the at least one processor is further configured to:

boost a power to an overlapping region comprising a first portion of the WUS for one sub-group and a second portion of a second WUS for a second sub-group; and

transmit the WUS for the one sub-group using a different sequence than the second WUS for the second sub-group.

75. The apparatus of claim 68 , wherein the WUS for the UE group and the non-group specific WUS are staggered and transmitted at different time periods.

76. The apparatus of claim 68 , wherein a first time gap between the WUS for the UE group and a paging occasion (PO) is greater than or equal to a second time gap between the non-group specific WUS and the PO.

77. A non-transitory computer-readable medium storing computer executable code for wireless communication at a user equipment (UE), the code when executed by at least one processor causes the UE to:

transmit paging capability information indicating that the UE supports group WUSs for paging occasions;

receive, from a base station, an allocation of resources assigned to one or more sub-group UEs in a UE group, wherein the one or more sub-group UEs include the UE, wherein a first amount of the one or more sub-group UEs is less than a second amount of UEs in the UE group; and

listen for a wake-up signal (WUS) from the base station in the resources for the UE group for the one or more sub-group UEs assigned to the UE group to wake-up for a paging occasion (PO), the WUS for the UE group being separated from a non-group specific WUS in a time domain based on a timing relation.

78. A non-transitory computer-readable medium storing computer executable code for wireless communication at a base station, the code when executed by at least one processor causes the base station to:

receive paging capability information indicating group WUSs for paging occasions capabilities of a plurality of user equipments (UEs);

group, based on the paging capability information, the plurality of UEs into a plurality of UE groups; and

transmit a WUS in an allocation of resources for a UE group from among the plurality of UE groups, the allocation of resources being assigned to one or more sub-group UEs in the UE group, wherein a first amount of the one or more sub-group UEs is less than a second amount of UEs in the UE group, the WUS for the UE group being separated from a non-group specific WUS in a time domain based on a timing relation.