Reporting of integrity-related information for positioning

1. A method, comprising:

transmitting at least one positioning integrity requirement to at least one radio access network node; and

receiving a report of one or more evaluated integrity-related metrics from the at least one radio access network node, the report comprising information relating to an expiry time for the one or more evaluated integrity-related metrics.

2. The method according to claim 1 , wherein the at least one positioning integrity metric comprises an alert limit of at least one client, application, or device that requires positioning information.

3. The method according to claim 2 , wherein the alert limit comprises a maximum position estimation error that is tolerable by the at least one client, application, or device.

4. The method according to claim 1 , further comprising transmitting a request for at least one integrity metric that the at least one radio access network node should report.

5. The method according to claim 1 , wherein the report comprises measurement or positioning estimate reporting.

6. The method according to claim 1 , wherein the transmitting comprises transmitting a request for expiry time to the at least one radio access network node and the receiving comprises receiving the expiry time from the at least one radio access network node, wherein the expiry time indicates the time period during which the reported information can be considered trustable.

7. The method according to claim 1 , wherein the transmitting comprises transmitting a request for a certain integrity metric and the receiving comprises receiving a protection level or an indication of whether there is an integrity risk with regards to a protection level.

8. The method according to claim 7 , wherein the protection level comprises an estimate of a maximum possible positioning error.

9. The method according to claim 7 , further comprising evaluating if there is an integrity risk based on the received protection level.

10. The method according to claim 1 , wherein the receiving comprises receiving a request or recommendation, from the at least one RAN node, to apply or adjust the measurement and/or reporting periodicity.

11. The method according to claim 1 , wherein the measurement periodicity comprises a transmission periodicity of at least one reference signal.

12. The method according to claim 1 , wherein the receiving comprises receiving a location correction or measurement report from the at least one radio access network node.

13. The method according to claim 1 , wherein the at least one radio access network node comprises at least one of a gNB, transmission-reception point, or user equipment.

14. A method, comprising:

receiving at least one positioning integrity requirement from a location server or location management function;

evaluating integrity metrics based on the positioning integrity requirement provided by the location server or location management function or based on factors affecting an integrity of a positioning estimate; and

transmitting a report of the one or more evaluated integrity-related metrics to the location server or location management function, the report comprising information relating to an expiry time for the one or more evaluated integrity-related metrics.

15. The method according to claim 14 , wherein the at least one positioning integrity metric comprises an alert limit of at least one client, application, or device that requires positioning information.

16. The method according to claim 15 , wherein the alert limit comprises a maximum position estimation error that is tolerable by the at least one client, application, or device.

17. The method according to claim 14 , further comprising receiving a request for at least one integrity metric that should be reported to the location server or location management function.

18. The method according to claim 14 , wherein the factors affecting the integrity of the positioning estimate comprises at least one of mobility of the user equipment, properties of radio propagation, or perceived legitimacy of at least one radio access network node.

19. The method according to claim 18 , wherein the properties of radio propagation comprise presence or strength of line of sight path.

20. The method according to claim 14 , wherein the report further comprises measurement reporting in the case where the position estimation is performed at the location server or location management function.

21. The method according to claim 14 , wherein:

the receiving comprises receiving a request for expiry time;

the evaluating comprises performing position measurement or estimation and deriving the expiry time; and

the transmitting comprises transmitting the position measurement or estimation and the expiry time to the location server or location management function.

22. The method according to claim 21 , wherein the expiry time is derived based on factors including at least one of mouser equipment mobility and properties of propagation environment, or the alert limit provided by the location server.

23. The method according to claim 14 , wherein:

the receiving comprises receiving a request for a certain integrity metric;

the evaluating comprises performing position measurement or estimation and deriving the requested integrity metric including a protection level; and

the transmitting comprises transmitting the protection level or an indication of

whether

there is an integrity risk with regards to a protection level to the location server or location management function.

24. The method according to claim 14 , wherein:

the evaluating comprises evaluating whether the measurement periodicity or reporting periodicity should be updated to ensure that the protection level is below the alert limit.

25. The method according to claim 14 , wherein:

the receiving comprises receiving a message containing at least a maximum error tolerance;

the evaluating comprises using the error tolerance to compute a timing limit and to perform a check against the reporting periodicity; and

when the reporting periodicity is larger than the timing limit, the evaluating further comprises computing a location correction; and

the transmitting comprises transmitting the location correction or measurement report to the location server or location management function.

26. The method according to claim 25 , wherein the location correction comprises at least one of a set of time-dependent time of arrival, reference signal time difference values, measured reference signal receive power values, or measured angle values correction terms.

27. An apparatus, comprising:

at least one processor; and

at least one memory comprising computer program code,

the at least one memory and computer program code configured, with the at least one processor, to cause the apparatus at least to:

transmit at least one positioning integrity requirement to at least one radio access network node; and

receive a report of one or more evaluated integrity-related metrics from the at least one radio access network node, the report comprising information relating to an expiry time for the one or more evaluated integrity-related metrics.

28. A non-transitory computer readable medium encoded with instructions that, when executed in hardware, perform a process, the process comprising:

transmitting at least one positioning integrity requirement to at least one radio access network node; and

receiving a report of one or more evaluated integrity-related metrics from the at least one radio access network node, the report comprising information relating to an expiry time for the one or more evaluated integrity-related metrics.