Channel quality indicator reporting

1. An apparatus, comprising:

at least one processor; and

at least one memory storing a computer program;

in which the at least one memory with the computer program is configured with the at least one processor to cause the apparatus to at least:

if a periodic channel quality indication resource is configured for a serving cell or if an aperiodic channel quality indication for the serving cell is requested from a network access node, when activating the serving cell in response to an activation/deactivation signaling from a network access node, reporting to the network access node an out of range channel quality indication report for the serving cell in a time period which is before the serving cell activation is completed, and

after the time period, reporting to the network access node a valid channel quality indication result for the serving cell,

wherein a minimum requirement is defined for the time period, and the valid channel quality indication result is reported no later than the minimum requirement.

2. The apparatus according to claim 1 , where the apparatus communicates with the network access node in accordance with transmission mode 9.

3. The apparatus according to claim 2 , where a valid channel quality indication result is available at least 4 ms after activation for transmission modes other than transmission mode 9 and until a first subframe that has a channel state information reference signal available after activation +4 ms for transmission mode 9.

4. The apparatus according to claim 1 , wherein the apparatus does not report to the network access node until the first occurrence of a channel state information reference signal.

5. The apparatus according to claim 4 , where a historic value is reported to the network access node before a first occurrence of the channel state information reference signal.

6. The apparatus according to claim 1 , wherein when a serving cell is activated all configured cells, or only configured and activated cells, report out of range channel quality indication value to the network access node until the apparatus has a valid channel quality indication result.

7. The apparatus according to claim 1 , further comprising:

a deactivation timer and a power headroom report trigger for determining whether a gap indicates a real activation of a deactivated serving cells or reactivation of the serving cell.

8. The apparatus according to claim 1 , where the time period includes processing time for a channel quality indication measurement.

9. A method comprising:

if a periodic channel quality indication resource is configured for a serving cell or if an aperiodic channel quality indication for the serving cell is requested from a network access node, when activating the serving cell in response to an activation/deactivation signaling from a network access node, reporting to the network access node an out of range channel quality indication report for the serving cell in a time period which is before the serving cell activation is completed, and

after the time period, reporting to the network access node a valid channel quality indication result for the serving cell,

wherein a minimum requirement is defined for the time period, and the valid channel quality indication result is reported no later than the minimum requirement.

10. The method according to claim 9 , where the step of sending the in-device coexistence interference indicator value to the network access node is in accordance with transmission mode 9.

11. The method according to claim 10 , where a valid channel quality indication result is available at least 4 ms after activation for transmission modes other than transmission mode 9 and until a first subframe that has a channel state information reference signal available after activation +4 ms for transmission mode 9.

12. The method according to claim 9 , wherein the step of reporting to the network access node does not occur until a first occurrence of a channel state information reference signal.

13. The method according to claim 12 , where a historic value is reported to the network access node before the first occurrence of the channel state information reference signal.

14. The method according to claim 9 , wherein when a serving cell is activated all configured cells or only configured and activated cells report out of range channel quality indication value to the network access node until the user equipment has a valid channel quality indication result.

15. The method according to claim 9 , further comprising a step of:

determining whether a gap indicates a real activation of a deactivated serving cells or reactivation of the serving cell by employing a deactivation timer and a power headroom report trigger.

16. The method according to claim 9 , where the time period includes processing time for a channel quality indication measurement.

17. A non-transitory computer readable medium storing a program of machine-readable instructions executable by a digital processing apparatus of a computer system to perform operations for controlling computer system actions, the operations comprising:

if a periodic channel quality indication resource is configured for a serving cell or if an aperiodic channel quality indication for the serving cell is requested from a network access node, when activating the serving cell in response to an activation/deactivation signaling from a network access node, reporting to the network access node an out of range channel quality indication report for the serving cell in a time period which is before the serving cell activation is completed, and

after the time period, reporting to the network access node a valid channel quality indication result for the serving cell,

wherein a minimum requirement is defined for the time period, and the valid channel quality indication result is reported no later than the minimum requirement.