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1. WO2020157734 - DÉTECTION DE CHANGEMENT D'AVANCE TEMPORELLE BASÉE SUR LE TEMPS D'ARRIVÉE

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CLAIMS

What is claimed is:

1. A method performed by a wireless device, the method comprising:

measuring (300) a reference time of arrival, TOAREF(TO), value for a reference base station for a time To at which the wireless device has a valid timing advance, TA(To), value;

measuring (302) time of arrival, TOAc(To), values for a set of one or more other base stations {BSx} for the time To;

computing and storing (304) time difference of arrival, TDOAx(To), values for the set of one or more other base stations {BSx} for the time To;

measuring (306) a reference time of arrival, TOAREF(TI), value for the reference base station for a time Ti, the time Ti being after the time To;

measuring (308) time of arrival, TOAc(Ti), values for the set of one or more other base stations {BSx} for the time Ti;

computing (310) time difference of arrival, TDOAx(Ti), values for the set of one or more other base stations {BSx} for the time Ti; and

determining (312) whether the TA(To) value is valid at the time Ti based on the TDOAx(To) values for the set of one or more other base stations {BSx} for the time To and the TDOAx(Ti) values for the set of one or more other base stations {BSx} for the time Ti.

2. The method of claim 1 wherein the time Ti is a time at which the wireless device is in idle mode.

3. The method of claim 1 or 2 wherein determining (312) whether the TA(To) value is valid at the time Ti comprises determining (312) that the TA(To) value is valid at the time Ti.

4. The method of claim 3 further comprising performing (314) an idle mode uplink

transmission using the TA(To) value upon determining (312) that the TA(To) value is valid at the time Ti.

5. The method of any one of claims 1 to 4 wherein the time To is a time at which the wireless device checked that its timing advance was valid for providing synchronized uplink access.

6. The method of any one of claims 1 to 5 wherein determining (312) whether the TA(To) value is valid at the time Ti comprises:

computing (400) differential time difference of arrival, dTDOAx(Ti), values for the set of one or more other base stations {BSx} for the time Ti, wherein for each other base station BSx of the set of one or more other base stations {BSx}, the dTDOAx(Ti) value is computed as a difference between the TDOAx(Ti) value for the BSx and the TDOAx(To) value for the BSx;

finding (402) a maximum value from among the dTDOAx(Ti) values, or absolute values of the dTDOAx(Ti) values, for the set of one or more other base stations {BSx} for the time Ti; and determining (404, 406, 408) whether the TA(To) value is valid at the time Ti based on the maximum value.

7. The method of claim 6 wherein determining (404, 406, 408) whether the TA(To) value is valid at the time T i based on the maximum value comprises determining (404) whether the maximum value is less than a predefined or configured threshold.

8. The method of claim 7 wherein determining (404, 406, 408) whether the TA(To) value is valid at the time T i based on the maximum value further comprises determining (406) that the TA(To) value is valid at the time Ti if the maximum value is less than the predefined or configured threshold.

9. The method of any one of claims 6 to 8 wherein determining (404, 406, 408) whether the TA(To) value is valid at the time Ti based on the maximum value further comprises determining (408) that the TA(To) value is not valid at the time Ti if the maximum value is greater than the predefined or configured threshold.

10. The method of any one of claims 1 to 5 wherein determining (312) whether the TA(To) value is valid at the time Ti comprises:

computing (500) differential time difference of arrival, dTDOAx(Ti), values for the set of one or more other base stations {BSx} for the time Ti, wherein for each other base station BSx of the set of one or more other base stations {BSx}, the dTDOAx(Ti) value is computed as a difference between the TDOAx(Ti) value for the BSx and the TDOAx(To) value for the BSx;

computing (502) a mean, standard deviation, or variance of the dTDOAx(Ti) values; and determining (504, 506, 508) whether the TA(To) value is valid at the time Ti based on the mean, standard deviation, or variance of the dTDOAx(Ti) values.

11. The method of claim 10 wherein determining (504, 506, 508) whether the TA(To) value is valid at the time Ti based on the mean, standard deviation, or variance of the dTDOAx(Ti) values comprises determining (504) whether the mean, standard deviation, or variance of the dTDOAx(Ti) values is less than a predefined or configured threshold.

12. The method of claim 11 wherein determining (504, 506, 508) whether the TA(To) value is valid at the time Ti based on the mean, standard deviation, or variance of the dTDOAx(Ti) values further comprises determining (506) that the TA(To) value is valid at the time Ti if the mean, standard deviation, or variance of the dTDOAx(Ti) values is less than the predefined or configured threshold.

13. The method of any one of claims 10 to 12 wherein determining (504, 506, 508) whether the TA(To) value is valid at the time Ti based on the mean, standard deviation, or variance of the dTDOAx(Ti) values further comprises determining (508) that the TA(To) value is not valid at the time Ti if the mean, standard deviation, or variance of the dTDOAx(Ti) values is greater than the predefined or configured threshold.

14. The method of any one of claims 1 to 13 wherein:

the TOAREF(TO) value is an averaged value over time and/or frequency;

the TOAc(To) values are averaged values over time and/or frequency;

the TOAREF(TI) value is an averaged value over time and/or frequency; and/or

the TOAx(Ti) values are averaged values over time and/or frequency.

15. The method of any one of claims 1 to 14 wherein the wireless device is a Narrowband Internet of Things, NB-IoT, User Equipment, UE, a Long Term Evolution Machine Type

Communication, LTE-M, UE, or a New Radio, NR, UE.

16. A wireless device (212; 1300) for a cellular communications system (200), the wireless device (212; 1300) adapted to:

measure (300) a reference time of arrival, TOAREF(TO), value for a reference base station for a time To at which the wireless device (212; 1300) has a valid timing advance, TA(To), value;

measure (302), time of arrival, TOAc(To), values for a set of one or more other base stations {BSx} for the time To;

compute and store (304) time difference of arrival, TDOAx(To), values for the set of one or more other base stations {BSx} for the time To;

measure (306) a reference time of arrival, TOAREF(TI), value for the reference base station for a time Ti, the time Ti being after the time To;

measure (308) time of arrival, TOAc(Ti), values for the set of one or more other base stations {BSx} for the time Ti;

compute (310) time difference of arrival, TDOAx(Ti), values for the set of one or more other base stations {BSx} for the time Ti; and

determine (312) whether the TA(To) value is valid at the time Ti based on the TDOAx(To) values for the set of one or more other base stations {BSx} for the time To and the TDOAx(Ti) values for the set of one or more other base stations {BSx} for the time Ti.

17. The wireless device (212; 1300) of claim 16 wherein the wireless device (212; 1300) is further adapted to perform the method of any one of claims 2 to 15.

18. The wireless device (212; 1300) of claim 16 or 17 wherein the wireless device (212; 1300) comprises:

one or more transmitters (1308);

one or more receivers (1310); and

processing circuitry (1302) associated with the one or more transmitters (1308) and the one or more receivers (1310), the processing circuitry (1302) configured to cause the wireless device (212; 1300) to:

measure (300) the reference time of arrival, TOAREF(TO), value for the reference base station for the time To at which the wireless device (212; 1300) has the valid timing advance, TA(To), value;

measure (302) the time of arrival, TOAc(To), values for the set of one or more other base stations {BSx} for the time To;

compute and store (304) the time difference of arrival, TDOAx(To), values for the set of one or more other base stations {BSx} for the time To;

measure (306) the reference time of arrival, TOAREF(TI), value for the reference base station for the time Ti;

measure (308) the time of arrival, TOAc(Ti), values for the set of one or more other base stations {BSx} for the time Ti;

compute (310) the time difference of arrival, TDOAx(Ti), values for the set of one or more other base stations {BSx} for the time Ti; and

determine (312) whether the TA(To) value is valid at the time Ti based on the TDOAx(To) values for the set of one or more other base stations {BSx} for the time To and the TDOAx(Ti) values for the set of one or more other base stations {BSx} for the time Ti.

19. A method performed by a wireless device, the method comprising:

obtaining (600) a distance that the wireless device has moved between a time To at which the wireless device has a valid timing advance, TA(To), value and a time Ti; and

determining (602, 604, 606) whether the TA(To) value is valid at the time Ti based on the distance.

20. The method of claim 19 wherein determining (602, 604) whether the TA(To) value is valid at the time Ti comprises determining (604) that the TA(To) value is valid at the time Ti.

21. The method of claim 20 further comprising performing an idle mode uplink transmission using the TA(To) value upon determining (604) that the TA(To) value is valid at the time Ti.

22. The method of any one of claims 19 to 21 wherein determining (602, 604, 606) whether the TA(To) value is valid at the time Ti based on the distance comprises determining (602) whether the distance is less than a predefined or configured threshold.

23. The method of claim 22 wherein determining (602, 604, 606) whether the TA(To) value is valid at the time Ti based on the distance further comprises determining (604) that the TA(To) value is valid at the time T i if the distance is less than the predefined or configured threshold.

24. The method of any one of claims 21 to 23 wherein determining (602, 604, 606) whether the TA(To) value is valid at the time Ti based on the distance further comprises determining (606) that the TA(To) value is not valid at the time Ti if the distance is greater than the predefined or configured threshold.

25. The method of any one of claims 19 to 24 wherein the wireless device is in connected mode at the time To and in idle mode at the time Ti.

26. The method of any one of claims 19 to 25 wherein the wireless device is a Narrowband Internet of Things, NB-IoT, User Equipment, UE, a Long Term Evolution Machine Type

Communication, LTE-M, UE, or a New Radio, NR, UE.

27. A wireless device (212; 1300) for a cellular communications system (200), the wireless device (212; 1300) adapted to:

obtain a distance that the wireless device (212; 1300) has moved between a time To at which the wireless device (212; 1300) has a valid timing advance, TA(To), value and a time Ti; and

determine whether the TA(To) value is valid at the time Ti based on the distance.

28. The wireless device (212; 1300) of claim 27 wherein the wireless device (212; 1300) is further adapted to perform the method of any one of claims 20 to 26.

29. The wireless device (212; 1300) of claim 27 or 28 wherein the wireless device (212; 1300) comprises:

one or more transmitters (1308);

one or more receivers (1310); and

processing circuitry (1302) associated with the one or more transmitters (1308) and the one or more receivers (1310), the processing circuitry (1302) configured to cause the wireless device (212; 1300) to:

obtain the distance that the wireless device (212; 1300) has moved between the time To at which the wireless device (212; 1300) has the valid timing advance, TA(To), value and the time Ti; and

determine whether the TA(To) value is valid at the time Ti based on the distance.

30. A method performed by a wireless device, the method comprising:

receiving (700), from a network node, an indication as to whether the wireless device is to determine Timing Advance, TA, validity when in idle mode using a Time Difference of Arrival, TDOA, scheme or a distance scheme;

if the indication indicates that the wireless device is to use the TDOA scheme, performing the method of any one of claims 1 to 15; and

if the indication indicates that the wireless device is to use the distance scheme, performing the method of any one of claims 19 to 26.

31. A method performed by a wireless device, the method comprising:

performing (800) an idle mode transmission using a stored Timing Advance, TA, value; receiving (804) a transmission from a base station that explicitly or implicitly indicates whether the stored TA value is valid, commands the wireless device to acquire a new TA value, or provides a new TA value; and

performing (806) one or more operations in accordance with the received transmission.

32. The method of claim 31 wherein:

performing (800) the idle mode transmission comprises performing (800) the idle mode transmission at a time Ti at which the wireless device is in idle mode; and

the stored TA value is a TA value, TA(To), obtained by the wireless device at a time To when the wireless device is in connected mode.

33. The method of claim 31 or 32 wherein:

the transmission indicates that the stored TA value is invalid; and

performing (806) the one or more operations comprises obtaining a new TA value.

34. The method of claim 33 wherein obtaining the new TA value comprises obtaining the new TA value using a random access procedure.

35. The method of any one of claims 31 to 34 wherein the wireless device is a Narrowband Internet of Things, NB-IoT, User Equipment, UE, a Long Term Evolution Machine Type

Communication, LTE-M, UE, or a New Radio, NR, UE.

36. A wireless device (212; 1300) for a cellular communications system (200), the wireless device (212; 1300) adapted to:

perform (800) an idle mode transmission using a stored Timing Advance, TA, value;

receive (804) a transmission from a base station that explicitly or implicitly indicates whether the stored TA value is valid, commands the wireless device (212; 1300) to acquire a new TA value, or provides a new TA value; and

perform (806) one or more operations in accordance with the received transmission.

37. The wireless device (212; 1300) of claim 36 wherein the wireless device (212; 1300) is further adapted to perform the method of any one of claims 32 to 35.

38. The wireless device (212; 1300) of claim 36 or 37 wherein the wireless device (212; 1300) comprises:

one or more transmitters (1308);

one or more receivers (1310);

processing circuitry (1302) associated with the one or more transmitters (1308) and the one or more receivers (1310), the processing circuitry (1302) configured to cause the wireless device (212; 1300) to:

perform (800) the idle mode transmission using the stored TA value; receive (804) the transmission from the base station that explicitly or implicitly indicates whether the stored TA value is valid, commands the wireless device (212; 1300) to acquire a new TA value, or provides a new TA value; and

perform (806) the one or more operations in accordance with the received transmission.

39. A method performed by a wireless device, the method comprising:

performing (900) an idle mode transmission using a stored Timing Advance, TA, value; detecting (902) that the idle mode transmission using the stored TA value was unsuccessful; and

upon detecting (902) that the idle mode transmission using the stored TA value was unsuccessful, obtaining (904) a new TA value.

40. The method of claim 39 wherein obtaining (904) the new TA value comprises obtaining (904) the new TA value using a random access procedure.

41. The method of claim 39 or 40 wherein the wireless device is a Narrowband Internet of Things, NB-IoT, User Equipment, UE, a Long Term Evolution Machine Type Communication, LTE-M, UE, or a New Radio, NR, UE.

42. A wireless device (212; 1300) for a cellular communications system (200), the wireless device (212; 1300) adapted to:

perform (900) an idle mode transmission using a stored Timing Advance, TA, value;

detect (902) that the idle mode transmission using the stored TA value was unsuccessful; and upon detecting (902) that the idle mode transmission using the stored TA value was unsuccessful, obtain (904) a new TA value.

43. The wireless device (212; 1300) of claim 42 wherein the wireless device (212; 1300) is further adapted to perform the method of any one of claims 40 to 41.

44. The wireless device (212; 1300) of claim 42 or 43 wherein the wireless device (212; 1300) comprises:

one or more transmitters (1308);

one or more receivers (1310);

processing circuitry (1302) associated with the one or more transmitters (1308) and the one or more receivers (1310), the processing circuitry (1302) configured to cause the wireless device (212; 1300) to:

perform (900) the idle mode transmission using the stored TA value;

detect (902) that the idle mode transmission using the stored TA value was unsuccessful; and

upon detecting (902) that the idle mode transmission using the stored TA value was unsuccessful, obtain (904) the new TA value.

45. A method performed by a base station, the method comprising:

transmitting (700), to a wireless device, an indication as to whether the wireless device is to determine Timing Advance, TA, validity when in idle mode using a Time Difference of Arrival, TDOA, scheme or a distance scheme.

46. A method performed by a base station, the method comprising:

receiving (800) an idle mode transmission from a wireless device;

determining (802) whether the wireless device used a valid Timing Advance, TA, value for the idle mode transmission; and

transmitting (804) a transmission to the wireless device that explicitly or implicitly indicates whether a particular TA value is valid, commands the wireless device to acquire a new TA value, or provides a new TA value, based on the determination of whether the wireless device used a valid TA value for the idle mode transmission.