Method and device for gain adjustment in mobility measurements

1. A method for gain adjustment in mobility measurements of a user equipment (UE), the method comprising:

selecting a signal stream of a plurality of signal streams received from a plurality of radio cells for mobility measurements;

performing a mobility measurement on the selected signal stream based on a given gain;

determining a gain update of the selected signal stream based on a received signal strength measurement of the selected signal stream; and

if the gain update is outside a predetermined gain range, initiating a recovery of the mobility measurement based on the gain update.

2. The method of claim 1 ,

wherein initiating the recovery of the mobility measurement comprises rescheduling the mobility measurement.

3. The method of claim 2 ,

wherein rescheduling the mobility measurement comprises rescheduling the mobility measurement within a same paging cycle.

4. The method of claim 2 ,

wherein rescheduling the mobility measurement comprises rescheduling the mobility measurement after mobility measurements on all other selected signal streams have been performed.

5. The method of claim 2 ,

wherein rescheduling the mobility measurement comprises rescheduling the mobility measurement within one of subsequent paging cycles.

6. The method of claim 1 ,

wherein initiating the recovery of the mobility measurement comprises discarding a result of the mobility measurement and repeating the mobility measurement.

7. The method of claim 6 ,

wherein repeating the mobility measurement is performed in one of succeeding paging cycles.

8. The method of claim 1 ,

wherein initiating the recovery of the mobility measurement comprises extending the mobility measurement.

9. The method of claim 8 ,

wherein extending the mobility measurement comprises extending the mobility measurement to at least one further sub-frame of a same paging cycle.

10. The method of claim 1 , comprising:

performing the mobility measurement within one sub-frame of the selected signal stream.

11. The method of claim 1 , comprising:

performing the received signal strength measurement based on at least one reference symbol comprised in the selected signal stream.

12. The method of claim 1 , comprising:

performing the received signal strength measurement after reception of a third or a half sub-frame of the selected signal stream.

13. The method of claim 1 ,

wherein performing the mobility measurement comprises at least one of a neighbor cell measurement, a neighbor cell identification and a combined neighbor cell identification and measurement.

14. The method of claim 1 ,

wherein performing the mobility measurement comprises performing an inter-frequency measurement.

15. The method of claim 1 ,

wherein determining the gain update of the selected signal stream is performed together with determining a time acquisition of the selected signal stream.

16. The method of claim 1 , comprising:

performing the mobility measurement when the UE is in idle mode or in connected mode.

17. A device for gain adjustment in mobility measurements of a user equipment (UE), the device comprising:

a receiving circuit configured to receive a plurality of signal streams from a plurality of radio cells;

a selection circuit configured to select a signal stream of the plurality of received signal streams for mobility measurements;

a mobility measurement circuit configured to perform a mobility measurement on the selected signal stream based on a given gain;

a signal strength measurement circuit configured to perform a received signal strength measurement of the selected signal stream;

a gain update circuit configured to determine a gain update of the selected signal stream based on the performed received signal strength measurement of the selected signal stream; and

a recovery circuit configured to initiate a recovery of the mobility measurement based on the gain update if the gain update is outside a predetermined gain range.

18. The device of claim 17 ,

wherein the mobility measurement circuit is configured to perform the mobility measurement within one sub-frame of the selected signal stream.

19. The device of claim 17 ,

wherein the signal strength measurement circuit is configured to perform the received signal strength measurement based on at least one reference symbol comprised in the selected signal stream.

20. The device of claim 17 ,

wherein the signal strength measurement circuit is configured to perform the received signal strength measurement after reception of a third or a half sub-frame of the selected signal stream.

21. A user equipment (UE) comprising:

a receiver circuit configured to receive a plurality of signal streams from a plurality of radio cells; and

a baseband circuit configured to:

select a signal stream of the plurality of received signal streams for mobility measurements;

perform a mobility measurement on the selected signal stream based on a given gain;

determine a gain update of the selected signal stream based on a received signal strength measurement of the selected signal stream; and

initiate a recovery of the mobility measurement based on the gain update if the gain update is outside a predetermined gain range.

22. The user equipment of claim 21 ,

wherein the baseband circuit is configured to perform the received signal strength measurement based on at least one reference symbol comprised in the selected signal stream.

23. The user equipment of claim 21 ,

wherein the baseband circuit is configured to perform the received signal strength measurement after reception of a third or a half sub-frame of the selected signal stream.

24. The user equipment of claim 21 ,

wherein the baseband circuit is configured to initiate the recovery of the mobility measurement based on discarding a result of the mobility measurement and repeating the mobility measurement.