Methods and arrangements for processing of measurement data in cellular communication systems
The problem of unsynchronized internal clocks of user equipments in a cellular communication system is addressed by a solution where a mechanism relying on a standalone clock function in user equipments is provided. Embodiments provide a network node that distributes a time reference to a user equipment (UE), and wherein the UE, using an internal clock function, time-stamps the logged measurements and/or events relative to the received time reference. When the UE has logged measurements the UE indicates to the network node that it has an available measurement log. The network node may then request several UEs to deliver their measurement log, respectively. The network node is then able to retrieve time stamped measurement information from the measurement log of each UE relative the sent time reference. Furthermore, the network node is then able to compare measurement information from each UE in a cell provided at the same time interval in all UEs.
1. A method in a user equipment for enabling processing of measurement data, the user equipment configured to communicate with a network node in a cellular communication system, the user equipment having a measurement log for storing measurement data and time reference information, the method comprising:
receiving a time reference from the network node;
starting an internal clock at the reception of the time reference;
storing the time reference in the measurement log;
sending an indication to the network node that the measurement log is available;
executing one or more measurements;
storing measurement data from the measurements with a determined value of the internal clock in the measurement log, the determined value of the internal clock being an amount of time elapsed relative to the time reference received;
receiving a request to deliver the measurement log from the network node;
delivering the measurement log to the network node.
2. The method of claim 1 , wherein the internal clock is a counter.
3. The method of claim 2 , wherein the counter is stepped one step by every second.
4. The method of claim 1 , wherein the time reference is a time-of-day and date indication.
5. The method of claim 1 , wherein the executing one or measurements is performed periodically.
6. The method of claim 1 , wherein the measurement is a downlink pilot signal strength measurement of serving cell or neighbor cell.
7. The method of claim 1 , wherein the measurement is a downlink pilot signal quality measurement of serving cell or neighbor cell.
8. A user equipment for enabling processing of measurement data, the user equipment configured to communicate with a network node in a cellular communication system, the user equipment comprising:
a storage device configured to store a measurement log in which measurement data and time reference information are stored;
a processor circuit configured to:
start an internal clock when a time reference is received;
store the time reference in the measurement log;
execute a measurement; and
store the measurement data with a determined value of an internal clock in the measurement log, the determined value of the internal clock being an amount of time elapsed relative to the time reference;
a transceiver configured to:
send an indication to the network node that the measurement log is available;
receive the time reference from the network node;
receive a request to deliver the measurement log from the network node;
deliver the measurement log to the network node.
9. The user equipment of claim 8 , wherein the internal clock is a counter.
10. The user equipment of claim 9 , wherein the counter is stepped one step by every second.
11. The user equipment of claim 8 , wherein the time reference is a time-of-day and date indication.
12. The user equipment of claim 8 , wherein the processor circuit is configured to execute the measurement periodically.
13. The user equipment of claim 8 , wherein the measurement is a downlink pilot signal strength measurement of serving cell or neighbor cell.
14. The user equipment of claim 8 , wherein the measurement is a downlink pilot signal quality measurement of serving cell or neighbor cell.
15. A method, in a network node, for processing of measurement data, the network node being in a cellular communication system and configured to communicate with user equipment, the method comprising:
for two or more user equipment:
sending a time reference to the user equipment;
receiving an indication from the user equipment that a measurement log is available;
sending a request, to the user equipment, to deliver the measurement log;
receiving the measurement log from the user equipment;
comparing the measurement logs of at least two of the two or more user equipment by comparing measurement data having been logged with corresponding values of an internal clock of the respective user equipment, the corresponding values of the internal clocks being a time elapsed relative to the time references sent to the respective user equipment.
16. The method of claim 15 , wherein at least one of the sent time references is a time-of-day and date indication.
17. The method of claim 15 , wherein the measurement logs comprise downlink pilot signal strength measurements of served cell or neighbor cell.
18. The method of claim 15 , wherein the measurement logs comprise downlink pilot signal quality measurements of served cell or neighbor cell.
19. A network node for processing of measurement data, the network node being in a cellular communication system and configured to communicate with user equipment, the network node comprising:
a transceiver configured to, for two or more user equipment:
receive an indication from the user equipment that a measurement log is available;
send a time reference to the user equipment;
send a request to deliver the measurement log to the user equipment;
receive the measurement log from the user equipment;
a processor circuit configured to compare the measurement logs of at least two of the two or more user equipment by comparing measurement data having been logged with corresponding values of an internal clock of the respective user equipment, the corresponding values of the internal clocks being a time elapsed relative to the time references sent to the respective user equipment.
20. The network node of claim 19 , wherein at least one of the sent time references is a time-of-day and date indication.
21. The network node of claim 19 , wherein the measurement logs comprise downlink pilot signal strength measurements of served cell or neighbor cell.
22. The network node of claim 19 , wherein the measurement logs comprise downlink pilot signal quality measurements of served cell or neighbor cell.