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1. (WO2018143864) SYSTEMS AND METHODS FOR USING NEIGHBORING CELL INFORMATION TO PERFORM MEASUREMENTS
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CLAIMS

1. A method in a wireless device in a first cell that receives assistance information from a first network node, the method comprising:

receiving, from the first network node, assistance information related to at least one of an operation mode and a subframe configuration associated with a second cell that is neighboring the first cell;

based on the assistance information, determining a plurality of measurement subframes; and

performing measurements using the plurality of measurement subframes.

2. The method of Claim 1, wherein the first network node serves the first cell and the second cell.

3. The method of Claim 1, wherein the wireless device camps on the first cell is the neighboring cell to the second cell.

4. The method of Claim 3, wherein the first network node and the second network node are physically co-located.

5. The method of any of Claims 3 to 4, wherein in order for the second network node to transition from a non-serving node to a serving node for the wireless device a handover must take place, wherein the assistance information identifies whether the NB-IoT operation mode of the second network node is the same as an NB-IoT operation mode of the first network node.

6. The method of any of Claims 1 to 5, wherein the assistance information comprises an NB-IoT operation mode of the second cell.

7. The method of any of Claims 5 to 6, wherein the NB-IoT operation mode is selected from the group consisting of a stand-alone operation mode, a guard-band operation mode, and an in-band operation mode.

8. The method of any of Claims 5 to 7, wherein:

the assistance information related to the NB-IoT operation mode comprises an explicit indication of a respective operation mode of each of a plurality of carrier frequencies, and determining the plurality of measurement subframes n each of the carrier frequencies.

9. The method of any of Claims 5 to 8, wherein the assistance information related to the NB-IoT operation mode indicates whether the second cell has a same downlink subframe configuration as the first cell.

10. The method of any of Claims 1 to 9, wherein the assistance information comprises an explicit indication of the operation mode of the second cell and a downlink subframe configuration for the second cell.

11. The method of any of Claims 1 to 10, wherein the assistance information comprises an explicit indication of at least one of:

a operation mode of each of at least one additional cell that neighbors the first cell; and

a valid downlink subframe configuration for each of the at least one additional cell that neighbors the first cell.

12. The method of any of Claims 1 to 11, wherein the assistance information comprises an explicit indication of a downlink subframe configuration of each a plurality of carrier frequencies.

13. The method of any of Claims 1 to 12, wherein:

the assistance information comprises a number of antenna ports used for transmission of the NRS, and

determining the plurality of measurement subframes is based on the number of antenna ports.

14. The method of any of Claims 1 to 13, wherein the assistance information related to operation mode comprises configuration information for cell-specific reference signals (CRS).

15. The method of any of Claims 1 to 14, wherein the plurality of measurement subframes contain Narrowband Reference Signals (NRS) and the NRS are used in performing the measurements.

16. The method of Claim 15, further comprising:

determining a number of resource elements comprising NRS based on the assistance information, and

performing the measurements using the number of resource elements determined to comprise NRS.

17. The method of any of Claims 1 to 14, wherein:

the plurality of measurement subframes contain at least one of Narrowband Primary Synchronization Signal (NPSS) and Narrowband Secondary Synchronization Signal (NSSS), and

the at least one of NPSS and NSSS are used in performing the measurements.

18. A method by a first network node providing assistance information to a wireless device in a first cell, the method comprising:

acquiring assistance information related to at least one of an operation mode and a subframe configuration associated with a second cell that neighbors the first cell; and

transmitting the assistance information to the wireless device for use in determining a plurality of measurement subframes and performing measurements in the plurality of measurement subframes.

19. The method of Claim 18, wherein the first network node also serves the second cell.

20. The method of Claim 18, wherein the wireless device is synchronized with the first network node, the first network node being a neighboring node to a second network node that serves the second cell.

21. The method of Claim 20, wherein the first network node and the second network node are physically co-located.

22. The method of any of Claims 20 to 21, wherein in order for the second network node to transition from a non-serving node to a serving node for the wireless device a handover must take place, wherein the assistance information identifies whether the NB-IoT operation mode of the second network node is the same as an NB-IoT operation mode of the first network node.

23. The method of any of Claims 18 to 20, wherein the assistance information comprises an NB-IoT operation mode of the second cell.

24. The method of any of Claims 22 to 23, wherein the NB-IoT operation mode is selected from the group consisting of a stand-alone operation mode, a guard-band operation mode, and an in-band operation mode.

25. The method of any of Claims 22 to 24, wherein the assistance information related to the NB-IoT operation mode comprises an explicit indication of a respective operation mode of each of a plurality of carrier frequencies

26. The method of any of Claims 22 to 25, wherein the assistance information related to the NB-IoT operation mode indicates whether the second cell has a same downlink subframe configuration as the first cell.

27. The method of any of Claims 18 to 26, wherein the assistance information comprises an explicit indication of the operation mode of the second cell and a downlink subframe configuration for the second cell.

28. The method of any of Claims 18 to 27, wherein the assistance information comprises an explicit indication of at least one of:

an operation mode of each of at least one additional cell that neighbors the first cell; and

a valid downlink subframe configuration for each of the at least one additional_cell that neighbors the first cell.

29. The method of any of Claims 18 to 28, wherein the assistance information comprises an explicit indication of a downlink subframe configuration of each a plurality of carrier frequencies.

30. The method of any of Claims 18 to 29, wherein the assistance information comprises at least one of a number of antenna ports used for transmission of the NRS, antenna port configurations, and sub-frame configuration.

31. The method of any of Claims 18 to 30, wherein the assistance information related to operation mode comprises configuration information for cell-specific reference signals (CRS).

32. The method of any of Claims 18 to 31, wherein the plurality of measurement subframes contain Narrowband Reference Signals (NRS) for use in performing the measurements.

33. The method of any of Claims 18 to 31, wherein:

the plurality of measurement subframes contain at least one of Narrowband Primary Synchronization Signal (NPSS) and Narrowband Secondary Synchronization Signal (NSSS) for use in performing the measurements.

34. A wireless device in a first cell that receives assistance information from a first network node, the wireless device comprising:

a memory storing instructions; and

processing circuitry operable to execute the instructions to cause the wireless device to:

receive, from the first network node, assistance information related to at least one of an operation mode and a subframe configuration associated with a second cell that neighbors the first cell;

based on the assistance information, determine a plurality of measurement subframes; and

perform measurements using the plurality of measurement subframes.

35. The wireless device of Claim 34, wherein the first network node serves the first cell and the second cell.

36. The wireless device of Claim 34, wherein the wireless device camps on the first network node, the first cell being the neighboring cell to the second cell.

37. The wireless device of Claim 36, wherein the first network node and the second network node are physically co-located.

38. The wireless device of any of Claims 36 to 37, wherein in order for the second network node to transition from a non-serving node to a serving node for the wireless device a handover must take place, wherein the assistance information identifies whether the NB-IoT operation mode of the second network node is the same as an NB-IoT operation mode of the first network node; .

39. The wireless device of any of Claims 34 to 38, wherein the assistance information comprises an NB-IoT operation mode of the second cell.

40. The wireless device of any of Claims 38 to 39, wherein the NB-IoT operation mode is selected from the group consisting of a stand-alone operation mode, a guard-band operation mode, and an in-band operation mode.

41. The wireless device of any of Claims 38 to 40, wherein:

the assistance information related to the NB-IoT operation mode comprises an explicit indication of a respective operation mode of each of a plurality of carrier frequencies, and determining the plurality of measurement subframes in each of the carrier frequencies.

42. The wireless device of any of Claims 38 to 41, wherein the assistance information related to the NB-IoT operation mode indicates whether the second cell has a same downlink subframe configuration as the first cell.

43. The wireless device of any of Claims 34 to 42, wherein the assistance information comprises an explicit indication of the operation mode of the second cell and a downlink subframe configuration for the second cell.

44. The wireless device of any of Claims 34 to 43, wherein the assistance information comprises an explicit indication of at least one of:

an operation mode of each of at least one additional cell that neighbors the first cell; and

a valid downlink subframe configuration for each of the at least one additional_cell that neighbors the first cell.

45. The wireless device of any of Claims 34 to 44, wherein the assistance information comprises an explicit indication of a downlink subframe configuration of each a plurality of carrier frequencies.

46. The wireless device of any of Claims 34 to 45, wherein:

the assistance information comprises at least one of a number of antenna ports used for transmission of the NRS, antenna port configurations, and sub-frame configuration, and determining the plurality of measurement subframes is based on the at least one of the number of antenna ports, antenna port configurations, and the sub-frame configuration.

47. The wireless device of any of Claims 34 to 46, wherein the assistance information related to operation mode comprises configuration information for cell-specific reference signals (CRS).

48. The wireless device of any of Claims 34 to 47, wherein the plurality of measurement subframes contain Narrowband Reference Signals (NRS) and the NRS are used in performing the measurements.

49. The wireless device of Claim 48, wherein the processing circuitry is operable to execute the instructions to cause the wireless device to:

determine a number of resource elements comprising NRS based on the assistance information, and

perform the measurements using the number of resource elements determined to comprise NRS.

50. The wireless device of any of Claims 34 to 47, wherein:

the plurality of measurement subframes contain at least one of Narrowband Primary Synchronization Signal (NPSS) and Narrowband Secondary Synchronization Signal (NSSS), and

the at least one of NPSS and NSSS are used in performing the measurements.

51. A first network node providing assistance information to a wireless device in a first cell, the first network node comprising:

a memory storing instructions; and

processing circuitry operable to execute the instructions to cause the first network node to:

acquire assistance information related to at least one of an operation mode and a subframe configuration associated with a second cell that neighbors the first cell; and

transmit the assistance information to the wireless device for use in determining a plurality of measurement subframes and performing measurements in the plurality of measurement subframes.

52. The first network node of Claim 51, wherein the first network node also serves the second cell.

53. The first network node of Claim 51, wherein:

the wireless device is synchronized with the first network node, and

the first network node is a neighboring node to a second network node that serves the second cell.

54. The first network node of Claim 53, wherein the first network node and the second network node are physically co-located.

55. The first network node of any of Claims 53 to 54, wherein in order for the second network node to transition from a non-serving node to a serving node for the wireless device a handover must take place, wherein the assistance information identifies whether the NB-IoT operation mode of the second network node is the same as an NB-IoT operation mode of the first network node.

56. The first network node of any of Claims 51 to 55, wherein the assistance information comprises an NB-IoT operation mode of the second cell.

57. The first network node of any of Claims 55 to 56, wherein the NB-IoT operation mode is selected from the group consisting of a stand-alone operation mode, a guard-band operation mode, and an in-band operation mode.

58. The first network node of any of Claims 55 to 57, wherein the assistance information related to the NB-IoT operation mode comprises an explicit indication of a respective operation mode of each of a plurality of carrier frequencies

59. The first network node of any of Claims 55 to 58, wherein the assistance information related to the NB-IoT operation mode indicates whether the second cell has a same downlink subframe configuration as the first cell.

60. The first network node of any of Claims 51 to 59, wherein the assistance information comprises an explicit indication of the operation mode of the second cell and a downlink subframe configuration for the second cell.

61. The first network node of any of Claims 51 to 60, wherein the assistance information comprises an explicit indication of at least one of:

an operation mode of each of at least one additional cell that neighbors the first cell; and

a valid downlink subframe configuration for each of the at least one additional_cell that neighbors the first cell.

62. The first network node of any of Claims 51 to 61, wherein the assistance information comprises an explicit indication of a downlink subframe configuration of each a plurality of carrier frequencies.

63. The first network node of any of Claims 51 to 62, wherein the assistance information comprises at least one of a number of antenna ports used for transmission of the NRS, antenna port configurations, and sub-frame configuration.

64. The first network node of any of Claims 51 to 63, wherein the assistance information related to operation mode comprises configuration information for cell-specific reference signals (CRS).

65. The first network node of any of Claims 51 to 64, wherein the plurality of measurement subframes contains Narrowband Reference Signals (NRS) for use in performing the measurements.

66. The first network node of any of Claims 51 to 64, wherein:

the plurality of measurement subframes contains at least one of Narrowband Primary Synchronization Signal (NPSS) and Narrowband Secondary Synchronization Signal (NSSS) for use in performing the measurements.