Method and arrangements in a mobile communication network

1. A method in a node of cellular telecommunication network capable of simultaneously using multiple carrier frequencies comprising a primary carrier frequency and at least one secondary carrier frequency, the method comprises the steps of:

receiving downlink quality measurements of a primary carrier frequency and of at least one secondary carrier frequency;

combining the received downlink quality measurements of the primary carrier frequency and of the at least one secondary carrier frequency by:

determining a combined downlink quality measure for the downlink quality measurements of the primary carrier frequency and the at least one secondary carrier frequency; and

determining a difference in logarithmic scale between the downlink quality measurements of the primary carrier frequency and the combined downlink quality measure for the downlink quality measurements of the primary carrier frequency and the at least one secondary carrier frequency to be used as a combined quality measure;

evaluating whether the combined quality measure fulfills a predetermined condition; and

triggering an event only if the combined quality measure fulfills the predetermined condition.

2. The method of claim 1 , wherein combining the downlink quality measurements of the primary carrier frequency and of the at least one secondary carrier frequency to determine a combined quality measurements comprises determining an average value of the received downlink quality measurements of the primary carrier frequency and of the at least one secondary carrier frequency.

3. The method of claim 1 , wherein the node is a user equipment (UE) and receiving downlink quality measurements of the primary carrier frequency and of at least one secondary carrier frequency comprises measuring downlink quality measurements of the primary carrier frequency and of at least one secondary carrier frequency.

4. The method of claim 3 , wherein the received downlink quality measurements of the primary carrier frequency and of at least one secondary carrier frequency are related to more than one set of cells.

5. The method of claim 4 , wherein combining the downlink quality measurements of the primary carrier frequency and of the at least one secondary carrier frequency to determine a combined quality measure comprises:

combining, for a first set of cells, the downlink quality measurements of the primary carrier frequency and of the at least one secondary carrier frequency to determine a combined quality measure of the first set of cells;

combining, for a second set of cells, the downlink quality measurements of the primary carrier frequency and of the at least one secondary carrier frequency to determine a combined quality measure of the second set of cells; and

determining a difference in logarithmic scale between the combined downlink quality measure of the first set of cells and the combined downlink quality measure of the second set of cells to be used as the combined quality measure.

6. The method of claim 4 , wherein combining the downlink quality measurements of the primary carrier frequency and of the at least one secondary carrier frequency to determine a combined quality measure comprises:

determining, for a first set of cells, combined downlink quality measure for the downlink quality measurements of the primary carrier frequency and the at least one secondary carrier frequency;

determining, for the first set of cells, a first difference representing a difference in logarithmic scale between the downlink quality measurements of the primary carrier frequency and of said combined downlink quality measure for the downlink quality measurements of the primary carrier frequency and the at least one secondary carrier frequency;

determining, for a second set of cells, combined downlink quality measure for the downlink quality measurements of the primary carrier frequency and the at least one secondary carrier frequency;

determining, for the second set of cells, a second difference representing a difference in logarithmic scale between the downlink quality measurements of the primary carrier frequency and of said combined downlink quality measure for the downlink quality measurements of the primary carrier frequency and the at least one secondary carrier frequency; and

determining a further difference in logarithmic scale between the first difference and the second difference to be used as the combined quality measure.

7. The method of claim 3 , wherein the event is a UE event comprising reporting the combined downlink quality measure to a network node.

8. The method of claim 3 , wherein the event comprises a performance of cell reselection if the predetermined condition is fulfilled.

9. The method of claim 1 , wherein the downlink quality measurements comprise a Reference Signal Received Quality (RSRQ) of the primary carrier and of the at least one secondary carrier frequency in multicarrier Evolved Universal Terrestrial Radio Access Network (E-UTRAN).

10. The method of claim 1 , wherein the downlink quality measurements comprise Common Pilot Channel (CPICH) E c /N 0 of the primary carrier and of the at least one secondary carrier frequency in multicarrier Wideband Code Division Multiple Access (WCDMA).

11. The method of claim 1 , wherein the downlink quality measurements comprise Channel Quality Indicators (CQIs) of the primary carrier frequency and of the at least one secondary carrier.

12. The method of claim 1 , wherein the event relates to radio resource management.

13. The method of claim 1 , wherein the predetermined condition is fulfilled if the combined quality measurement or the determined difference falls below respective thresholds.

14. The method of claim 13 , wherein the thresholds are signaled by the network.

15. The method of claim 13 , wherein the thresholds are predetermined values.

16. The method of claim 1 , wherein the predetermined condition is fulfilled if the combined quality measurement or the determined difference rises above respective thresholds.

17. A network node of a cellular telecommunication network capable of simultaneously using multiple carrier frequencies comprising a primary carrier frequency and at least one secondary carrier frequency, the node comprising:

a receiver operable to receive downlink quality measurements of the primary carrier frequency and of at least one secondary carrier frequency;

a combining unit operable to:

combine the received downlink quality measurements of the primary carrier frequency and of the at least one secondary carrier frequency configured to determine a combined downlink quality measure for the downlink quality measurements of the primary carrier frequency and the at least one secondary carrier frequency; and

determine a difference in logarithmic scale between the downlink quality measurements of the primary carrier frequency and said combined downlink quality measure for the downlink quality measurements of the primary carrier frequency and the at least one secondary carrier frequency to be used as a combined quality measure;

an evaluation unit operable to evaluate whether the combined quality measure fulfills a predetermined condition; and

a triggering unit operable to trigger an event only if the combined quality measure fulfills a predetermined condition.

18. The network node of claim 17 , wherein the combining unit is further operable to determine an average value of the received downlink quality measurements of the primary carrier frequency and of the at least one secondary carrier frequency.

19. The network node of claim 17 , wherein the downlink quality measurements are Channel Quality Indicators (CQIs) of the primary carrier frequency and of the at least one secondary carrier.

20. The network node of claim 17 , wherein the event relates to radio resource management.

21. A User Equipment (UE) connectable to a cellular telecommunication network capable of simultaneously using multiple carrier frequencies comprising a primary carrier frequency and at least one secondary carrier frequency, the UE comprises

a measuring unit operable to measure downlink quality measurements of the primary carrier frequency and of at least one secondary carrier frequency;

a combining unit operable to:

combine the measured downlink quality measurements of the primary carrier frequency and of the at least one secondary carrier frequency configured to determining a combined downlink quality measure for the downlink quality measurements of the primary carrier frequency and the at least one secondary carrier frequency; and

determine a difference in logarithmic scale between the downlink quality measurements of the primary carrier frequency and said combined downlink quality measure for the downlink quality measurements of the primary carrier frequency and the at least one secondary carrier frequency to be used as a combined quality measure; and

an evaluation unit operable to evaluate whether the combined quality measure fulfills a predetermined condition; and

a triggering unit operable to trigger an event only if the combined quality measure fulfills a predetermined condition.

22. The user equipment of claim 21 , wherein the combining unit is further operable to determine an average value of the received downlink quality measurements of the primary carrier frequency and of the at least one secondary carrier frequency.

23. The user equipment of claim 22 , wherein the received downlink quality measurements of the primary carrier frequency and of at least one secondary carrier frequency are related to more than one set of cells.

24. The user equipment of claim 23 , wherein the combining unit is further operable to combine, for a first set of cells, the downlink quality measurements of the primary carrier frequency and of the at least one secondary carrier frequency to determine a combined quality measure of the first set of cells, to combine, for a second set of cells, the downlink quality measurements of the primary carrier frequency and of the at least one secondary carrier frequency to determine a combined quality measure of the second set of cells, to determine in logarithmic scale between the combined downlink quality measure of the first set of cells and the combined downlink quality measure of the second set of cells to be used as the combined quality measure.

25. The user equipment of claim 23 , wherein the combining unit is further operable to:

determine, for a first set of cells, combined downlink quality measure for the downlink quality measurements of the primary carrier frequency and the at least one secondary carrier frequency;

determine, for the first set of cells, a first difference representing a difference in logarithmic scale between the downlink quality measurements of the primary carrier frequency and of said combined downlink quality measure for the downlink quality measurements of the primary carrier frequency and the at least one secondary carrier frequency;

determine, for a second set of cells, combined downlink quality measure for the downlink quality measurements of the primary carrier frequency and the at least one secondary carrier frequency;

determine, for the second set of cells, a second difference representing a difference in logarithmic scale between the downlink quality measurements of the primary carrier frequency and of said combined downlink quality measure for the downlink quality measurements of the primary carrier frequency and the at least one secondary carrier frequency; and

determine a further difference in logarithmic scale between the first difference and the second difference to be used as the combined quality measure.

26. The user equipment of claim 21 , wherein the event is a UE event comprising reporting the combined downlink quality measure to a network node.

27. The user equipment of claim 21 , wherein the event comprises a performance of cell reselection if the predetermined condition is fulfilled.

28. The user equipment of claim 21 , wherein the downlink quality measurements comprise a Reference Signal Received Quality (RSRQ) of the primary carrier and of the at least one secondary carrier frequency in multicarrier Evolved Universal Terrestrial Radio Access Network (E-UTRAN).

29. The user equipment of claim 21 , wherein the downlink quality measurements comprise Common Pilot Channel (CPICH) E c /N 0 of the primary carrier and of the at least one secondary carrier frequency in multicarrier Wideband Code Division Multiple Access (WCDMA).

30. The user equipment of claim 21 , wherein the event relates to radio resource management.

31. The user equipment of claim 21 , wherein the predetermined condition is fulfilled if the combined quality measurement or the determined difference falls below respective thresholds.

32. The user equipment of claim 31 , wherein the thresholds are signaled by the network.

33. The user equipment of claim 31 , wherein the thresholds comprise predetermined values.

34. The user equipment of claim 21 , wherein the predetermined condition is fulfilled if the combined quality measurement or the determined difference rises above respective thresholds.