Methods and arrangements for maintaining timing characteristics

1. A method in a coordinating node of a wireless communication system, of maintaining timing characteristics of radio base stations connected to the coordinating node, the method comprising:

receiving timing information from a plurality of radio base stations;

determining a respective timing characteristic of each of said plurality of radio base stations based on the received timing information, wherein the determined respective timing characteristic is a respective absolute drift rate;

maintaining the determined respective timing characteristics for support of network operations and services;

determining a respective global navigation satellite system synchronization indicator of each of said plurality of radio base stations based on the determined respective absolute drift rate, and

determining a relative timing characteristic of a first and second radio base station based on the determined respective timing characteristics of the first and second radio base stations, wherein the determined relative timing characteristic is also maintained.

2. The method according to claim 1 , wherein maintaining the determined respective timing characteristics comprises storing and/or updating the determined respective timing characteristics in a database.

3. The method according to claim 1 , wherein the determined respective timing characteristic comprises at least one of an offset, a drift rate, and/or an error variance.

4. The method according to claim 1 , wherein the relative timing characteristic is a relative offset, the method further comprising:

comparing the determined relative offset with a threshold; and

determining a base station align indicator of the first and second radio base stations based on the comparison, wherein the base station align indicator is also maintained.

5. The method according to claim 1 , wherein the timing information comprises absolute timing information and/or timing information relative to a timing reference.

6. The method according to claim 1 , further comprising:

transmitting a request for timing information to each of said plurality of radio base stations before receiving the timing information.

7. The method according to claim 6 , further comprising:

identifying said plurality of radio base stations to which to transmit the request for timing information based on an update interval of the respective timing characteristic.

8. The method according to claim 7 ,

wherein identifying said plurality of radio base stations to which to transmit the request for timing information is further based on a geographical area, a radio base station type, and/or a radio base station vendor.

9. A coordinating node configured to be used in a wireless communication system and to maintain timing characteristics of radio base stations connectable to the coordinating node, the coordinating node comprising:

a receiver circuit configured to receive timing information from a plurality of radio base stations;

a determining circuit configured to determine a respective timing characteristic of each of said plurality of radio base stations based on the received timing information, wherein the determined respective timing characteristic comprises a respective absolute drift rate; and

a maintaining circuit configured to maintain the determined respective timing characteristics for support of network operations and services,

wherein the determining circuit is further configured to determine a respective global navigation satellite system synchronization indicator of each of said plurality of radio base stations based on the determined respective absolute drift rate,

wherein the determining circuit is further configured to determine a relative timing characteristic of a first and second radio base station based on the determined respective timing characteristics of the first and second radio base stations, and the maintaining circuit is further configured to maintain also the relative timing characteristic.

10. The coordinating node according to claim 9 , wherein the maintaining circuit is further configured to store or update the determined respective timing characteristics in a database.

11. The coordinating node according to claim 9 , wherein the determined respective timing characteristic comprises an offset, a drift rate, and/or an error variance.

12. The coordinating node according to claim 9 , wherein the relative timing characteristic comprises a relative offset, the coordinating node further comprising:

a comparing circuit configured to compare the determined relative offset with a threshold;

wherein the determining circuit is further configured to determine a base station align indicator of the first and second radio base stations based on the comparison, and the maintaining circuit is further configured to maintain also the base station align indicator.

13. The coordinating node according to claim 9 , wherein the timing information comprises absolute timing information and/or timing information relative to a timing reference.

14. The coordinating node according to claim 9 , further comprising:

a transmitter circuit configured to transmit a request for timing information to each of said plurality of radio base stations.

15. The coordinating node according to claim 14 , further comprising:

an identifying circuit configured to identify said plurality of radio base stations to which the transmitter circuit transmits the request for timing information based on an update interval of the respective timing characteristic.

16. The coordinating node according to claim 15 , wherein the identifying circuit is further configured to identify said plurality of radio base stations based on a geographical area, a radio base station type, and/or a radio base station vendor.

17. The coordinating node according to claim 9 , wherein the coordinating node is co-located with a positioning node in a control plane architecture or a user plane architecture, or with an operations support system.