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1. WO2020225031 - DISCOVERY OF AND RECOVERY FROM MISSED WAKE-UP SIGNAL (WUS) RECEPTION

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

CLAIMS

1. A method for selective transmission of wake-up signals, WUS, to a user equipment, UE, by a network node in a radio access network, RAN, the method comprising:

transmitting (1040) a WUS to the UE during a first occasion;

during one or more second occasions, monitoring (1050) for WUS feedback from the UE in response to the transmitted WUS; and

based on the results of the monitoring, selectively transmitting (1080) one or more

further WUS to the UE during respective one or more third occasions.

2. The method of claim 1, wherein:

the WUS transmitted during the first occasion includes a repetition indicator; and selectively transmitting (1080) the one or more further WUS comprises incrementing (1082) the repetition indicator included in each further WUS that is transmitted.

3. The method of any of claims 1-2, wherein:

the WUS transmitted during the first occasion includes a bitfield of a plurality of bits; and

each bit in the bitfield indicates whether the WUS is intended for a corresponding

member of a group of UEs.

4. The method of any of claims 1-3, wherein the WUS differs from the one or more further WUS in one or more of the following transmission characteristics: aggregation level, modulation and coding scheme, power level, interference from other signals transmitted concurrently, positions within respective timeslots, and frequency resources.

5. The method of any of claims 1-4, wherein:

the method further comprises transmitting (1010), to the UE, information identifying one or more monitoring occasions, including the first occasion, for WUS transmissions by the network node; and

at least a portion of the identified WUS monitoring occasions are not associated with subsequent physical downlink control channel, PDCCH, transmissions by the network node.

6. The method of any of claims 1-5, wherein selectively transmitting (1080) the further WUS comprises, based on detecting no WUS feedback from the UE during one of the second occasions, transmitting (1081) a further WUS to the UE during a corresponding third occasion.

7. The method of claim 6, further comprising, after a predetermined number of repetitions of detecting no WUS feedback from the UE during second occasions and transmitting further WUS to the UE during corresponding third occasions, performing (1090) one of the following operations:

declaring a radio link failure, RLF, of the UE; or

configuring the UE to wake up for monitoring a physical downlink control channel, PDCCH, independent of the UE’s reception of the WUS.

8. The method of any of claims 1-7, further comprising transmitting (1020), to a UE, a transmission configuration for periodic channel state information, CSI, reports during at least a first portion of the second occasions.

9. The method of claim 8, wherein:

the transmission configuration identifies a parameter to be excluded from a periodic CSI report that is not responsive to UE detection of a WUS;

monitoring (1050) for the WUS feedback comprises monitoring (1051) for the periodic CSI reports during the second occasions; and

selectively transmitting (1080) the further WUS to the UE during each third occasion is based on whether a periodic CSI report received during a corresponding second occasion includes the parameter.

10. The method of any of claims 1-7, further comprising:

transmitting (1060), to the UE, a physical downlink control channel, PDCCH, message with scheduling information for a subsequent physical downlink shared channel, PDSCH, transmission by the network node; and

performing (1070) the PDSCH transmission according to the scheduling information.

11. The method of claim 10, wherein selectively transmitting (1080) the one or more further WUS during each third occasion is based on detecting no WUS feedback during a second occasion in the same timeslot as the PDCCH message and during a second occasion after the PDSCH transmission.

12. The method of any of claims 10-11, wherein:

the method further comprises transmitting (1020), to a UE, a transmission configuration for periodic channel state information, CSI, reports during at least a first portion of the second occasions; and

monitoring (1050) for the WUS feedback comprises:

monitoring (1052) for the periodic CSI reports during the first portion, and monitoring (1053) for a response, by the UE, to the PDCCH message or the PDSCH transmission during a second portion of the second occasions; and

selectively transmitting (1080) the further WUS to the UE during each third occasion is based on detecting periodic CSI feedback from the UE during a corresponding occasion of the first portion and detecting no response by the UE during a corresponding occasion of the second portion.

13. The method of any of claims 1-7, further comprising transmitting (1030), to a UE, a transmission configuration for WUS feedback in response to detecting a WUS intended for the UE.

14. The method of claim 13, wherein:

the transmission configuration for the WUS feedback comprises a request for an

aperiodic channel state information, CSI, report from the UE; and monitoring (1050) for the WUS feedback during the second occasions comprises

monitoring (1054) a physical uplink channel for the aperiodic CSI report.

15. The method of claim 13, wherein:

the transmission configuration for the WUS feedback comprises scheduling information for a subsequent physical downlink shared channel, PDSCH, transmission by the network node;

the method further comprises performing (1070) the PDSCH transmission according to the scheduling information; and

monitoring (1050) for the WUS feedback during the second occasions comprises

monitoring (1055) a physical uplink channel for a hybrid ARQ response to the PDSCH transmission.

16. The method of claim 13, wherein:

the transmission configuration for the WUS feedback comprises:

a configuration of resources for transmission of the WUS feedback, and a timing of the WUS feedback relative to the WUS transmission; and at least one of the configuration of resources and the relative timing is included in the transmitted WUS.

17. The method of any of claims 1-16, wherein:

the WUS is transmitted as downlink control information, DCI, on a physical downlink control channel, PDCCH; and

the WUS indicates that the UE should monitor for a scheduling message on the PDCCH during a subsequent discontinuous reception, DRX, On duration for the UE.

18. A method for receiving wake-up signals, WUS, transmitted by a network node in a radio access network, RAN, the method comprising:

during a first occasion, monitoring (1140) for a WUS from the network node that is intended for the UE;

selectively transmitting (1160) WUS feedback to the network node during one or more second occasions; and

selectively monitoring (1180) for one or more further WUS, from the network node, during respective one or more third occasions.

19. The method of claim 18, wherein:

each of the WUS and further WUS include a repetition indicator; and

selectively monitoring (1180) for further WUS transmissions comprises determining (1182) whether a second value of the repetition indicator in a further WUS is greater than a first value of the repetition indicator in the WUS.

20. The method of any of claims 18-19, wherein:

the WUS includes a bitfield of a plurality of bits, each bit indicating whether the WUS is intended for a corresponding member of a group of UEs; and

selectively transmitting (1160) the WUS feedback is based on a value of a particular one of the bits that is associated with the UE.

21. The method of any of claims 18-20, wherein the WUS differs from the one or more further WUS in one or more of the following transmission characteristics: aggregation level, modulation and coding scheme, power level, interference from other signals transmitted concurrently, positions within respective timeslots, and frequency resources.

22. The method of any of claims 18-21, wherein:

the method further comprises receiving (1110), from the network node, information identifying one or more monitoring occasions, including the first occasion, for WUS transmissions by the network node; and

at least a portion of the monitoring occasions are independent of occasions where the UE is configured to wake up for monitoring a physical downlink control channel, PDCCH.

23. The method of claim 22, wherein

the monitoring occasions also include one or more further monitoring occasions; and the method further comprises, based on detecting the WUS during the first occasion, refraining (1150) from monitoring for the WUS during the further monitoring occasions.

24. The method of any of claims 18-23, wherein the one or more second occasions correspond to the respective one or more third occasions.

25. The method of any of claims 18-24, further comprising receiving (1120), from the network node, a transmission configuration for periodic channel state information (CSI) reports during at least a first portion of the second occasions.

26. The method of claim 25, wherein:

the transmission configuration identifies a parameter to be excluded from a periodic CSI report that is not responsive to UE detection of a WUS; and

selectively transmitting (1160) the WUS feedback comprises transmitting (1160 A) the periodic CSI report during the second occasions, wherein the periodic CSI report selectively includes the parameter based on whether the WUS was detected during the first occasion.

27. The method of any of claims 18-24, further comprising:

based on whether the WUS was detected during the first occasion, selectively monitoring (1170) for a physical downlink control channel, PDCCH, message with scheduling information for a subsequent physical downlink shared channel, PDSCH, transmission by the network node; and

based on whether the PDCCH message was successfully received, selectively monitoring (1180) for the PDSCH transmission according to the scheduling information.

28. The method of claim 27, wherein selectively transmitting (1160) the WUS feedback during the second occasions comprises refraining (1160D) from transmitting the WUS feedback based on not detecting the WUS during the first occasion.

29. The method of claim 28, wherein selectively transmitting (1160) the WUS feedback during the second occasions further comprises, based on detecting the WUS during the first occasion:

transmitting (1160E) a negative acknowledgement, NACK, in the same timeslot as the PDCCH message based on unsuccessful reception of the PDCCH message; transmitting (1160F) the NACK in an occasion after the PDSCH transmission based on successful reception of the PDCCH message and unsuccessful reception of the PDSCH transmission; and

transmitting (1160G) a positive acknowledgement, ACK, in the occasion after the

PDSCH transmission, based on successful reception of the PDCCH message and successful reception of the PDSCH transmission.

30. The method of any of claims 27-29, wherein:

the method further comprises receiving (1120), from the network node, a transmission configuration for periodic channel state information, CSI, reports during at least a first portion of the second occasions; and

selectively transmitting (1160) the WUS feedback during the second occasions further comprises:

transmitting (1160H) the periodic CSI reports during the first portion, and during a second portion of the second occasions and based on detecting the WUS during the first occasion, transmitting (1160J) a response indicating whether the PDCCH message and the PDSCH transmission were successfully received.

31. The method of any of claims 18-24, wherein selectively transmitting (1160) the WUS feedback comprises:

transmitting (1160B) a positive acknowledgement, ACK, based on detecting the WUS during the first occasion; and

one of the following based on not detecting the WUS during the first occasion:

transmitting (1160C) a negative acknowledgement, NACK; or

refraining (1160D) from transmitting WUS feedback.

32. The method of any of claims 18-24, further comprising receiving (1130), from the network node, a transmission configuration for WUS feedback in response to detecting a WUS intended for the UE.

33. The method of claim 32, wherein:

the transmission configuration for the WUS feedback comprises a request for an

aperiodic channel state information (CSI) report from the UE; and selectively transmitting (1160) the WUS feedback comprises, based on detecting the

WUS transmission during the first occasion, subsequently transmitting (1160K) the aperiodic CSI report on a physical uplink channel.

34. The method of claim 32, wherein:

the transmission configuration for the WUS feedback comprises scheduling information for a subsequent physical downlink shared channel (PDSCH) transmission by the network node; and

selectively transmitting (1160) the WUS feedback comprises, based on successfully receiving the PDSCH transmission, subsequently transmitting (1160L) a hybrid ARQ response on a physical uplink channel.

35. The method of claim 32, wherein:

the transmission configuration for the WUS feedback comprises:

a configuration of resources for transmission of the WUS feedback, and a timing of the WUS feedback relative to the WUS transmission; and at least one of the configuration of resources and the relative timing is included in the transmitted WUS.

36. The method of any of claims 18-35, wherein:

the WUS is received as downlink control information, DCI, on a physical downlink control channel, PDCCH; and

the WUS indicates that the UE should monitor for a scheduling message on the PDCCH during a subsequent discontinuous reception, DRX, On duration for the UE.

37. A network node (105, 110, 115, 300, 350, 410, 420, 1500), for a radio access network, RAN (100, 399, 499, 1630), configured for selective transmission of wake-up signals, WUS, to a user equipment, UE (120, 430, 1400, 1610), wherein the network node comprises:

radio network interface circuitry (1540) configured to communicate with the UEs; and processing circuitry (1510) operatively associated with the radio network interface

circuitry, whereby the processing circuitry and the radio network interface circuitry are configured to perform operations corresponding to any of the methods of claims 1-18.

38. A network node (105, 110, 115, 300, 350, 410, 420, 1500), for a radio access network, RAN (100, 399, 499, 1630), configured for selective transmission of wake-up signals, WUS, to a user equipment, UE (120, 430, 1400, 1610), wherein the network node is further arranged to perform operations corresponding to any of the methods of claims 1-18.

39. A non-transitory, computer-readable medium (1820) storing computer-executable instructions that, when executed by processing circuity (1810) of network node (105, 110, 115, 300, 350, 410, 420, 1500) for a radio access network, RAN (100, 399, 499, 1630), cause the network node to perform operations corresponding to any of the methods of claims 1-18.

40. A computer program product (1821) comprising computer-executable instructions that, when executed by processing circuity (1810) of network node (105, 110, 115, 300, 350, 410, 420, 1500) for a radio access network, RAN (100, 399, 499, 1630), cause the network node to perform operations corresponding to any of the methods of claims 1-18.

41. A user equipment, UE (120, 405, 1400, 1610) configured for receiving wake-up signals, WUS, transmitted by a network node (105, 110, 115, 300, 350, 410, 420, 1500) of a radio access network, RAN (100, 399, 499, 1630), the UE comprising:

radio transceiver circuitry (1440) configured to communicate with the network node; and processing circuitry (1410) operatively associated with the radio transceiver circuitry, whereby the processing circuitry and the radio transceiver circuitry are configured to perform operations corresponding to any of the methods of claims 19-36.

42. A user equipment, UE (120, 405, 1400, 1610) configured for receiving wake-up signals,

WUS, transmitted by a network node (105, 110, 115, 300, 350, 410, 420, 1500) of a radio access network, RAN (100, 399, 499, 1630), the UE being further arranged to perform operations corresponding to any of the methods of claims 19-36.

43. A non-transitory, computer-readable medium (1420) storing computer-executable instructions that, when executed by processing circuitry (1410) of a user equipment, UE (120, 405, 1400, 1610), cause the UE to perform operations corresponding to any of the methods of claims 19-36.

44. A computer program product (1421) comprising computer-executable instructions that, when executed by processing circuitry (1410) of a user equipment, UE (120, 405, 1400, 1610), cause the UE to perform operations corresponding to any of the methods of claims 19-36.