Wireless communication terminal and method thereof

1. A wireless communication terminal, comprising:

a transmitter, which, in operation, transmits CSI (Channel State Information) to a base station, and

circuitry, which is coupled to the transmitter and which, in operation, determines at least one measurement resource, among at least two measurement resources configured per subframe, to be unreported when a number of the measurement resources configured in one subframe exceeds a maximum number of measurement resources supported by the wireless communication terminal in one subframe, determines not to update CSI for the determined measurement resource per subframe, wherein the at least one measurement resource is determined based on a lowest priority assigned thereto and based on a number of measurement resources unreported within N subframes before a subframe in which the configured measurement resource corresponding to the unreported measurement resource is transmitted, wherein N is an integer equal to or greater than 1.

2. The wireless communication terminal according to claim 1 , wherein a signal measurement resource is configured to have higher priority than an interference measurement resource.

3. The wireless communication terminal according to claim 1 , wherein the circuitry, in operation, increases the priority of measurement resource(s) related to a CSI report, which is aperiodically triggered, to be higher than other measurement resource(s) when the measurement resource(s) related to the CSI report are between an aperiodic trigger and a relevant uplink CSI report.

4. The wireless communication terminal according to claim 1 , wherein

the priority of the measurement resource is increased according to previous unreporting(s) of the measurement resource.

5. The wireless communication terminal according to claim 4 , wherein

only previous unreporting(s) of the measurement resource within an effective window is considered to increase the priority of the measurement resource.

6. The wireless communication terminal according to claim 4 , wherein the circuitry, in operation, increases the priority of measurement resource(s) related to a CSI report, which is aperiodically triggered, to be higher than other measurement resource(s) when the measurement resource(s) related to the CSI report are between an aperiodic trigger and a relevant uplink CSI report.

7. The wireless communication terminal according to claim 1 , wherein

each configured measurement resource is unreported one or more times in a round robin manner, and

the measurement resource with lower priority is unreported no less than the one with higher priority.

8. The wireless communication terminal according to claim 1 , wherein the measurement resource is not unreported A times within the duration of N subframes, where A is an integer larger than 1, N corresponds to one plus B*periodicity of the measurement resource, and B is an integer equal to or larger than 1.

9. The wireless communication terminal according to claim 8 , wherein A is equal to 2, and B is equal to 1.

10. The wireless communication terminal according to claim 8 , wherein for the measurement resource with the lowest priority, A is equal to 3, and B is equal to 2, and for other measurement resource(s), A is equal to 2, and B is equal to 1.

11. A wireless communication method, comprising:

transmitting CSI (Channel State Information) to a base station;

determining at least one measurement resource, among at least two measurement resources configured per subframe, to be unreported when a number of the measurement resources configured in one subframe exceeds a maximum number of measurement resources supported by the wireless communication terminal in one subframe; and

determining not to update the CSI for the determined measurement resource per subframe;

wherein the at least one measurement resource is determined based on a lowest priority assigned thereto and based on a number of measurement resources unreported within N subframes before a subframe in which the configured measurement resource corresponding to the unreported measurement resource is transmitted, wherein N is an integer equal to or greater than 1.

12. The wireless communication method according to claim 11 , wherein a signal measurement resource is configured to have higher priority than an interference measurement resource.

13. The wireless communication method according to claim 11 , comprising:

increasing the priority of measurement resource(s) related to a CSI report, which is aperiodically triggered, to be higher than other measurement resource(s) when the measurement resource(s) related to the CSI report are between an aperiodic trigger and a relevant uplink CSI report.

14. The wireless communication method according to claim 11 , wherein

the priority of the measurement resource is increased according to previous unreporting(s) of the measurement resource.

15. The wireless communication method according to claim 14 , wherein

only previous unreporting(s) of the measurement resource within an effective window is considered to increase the priority of the measurement resource.

16. The wireless communication method according to claim 14 , comprising:

increasing the priority of measurement resource(s) related to a CSI report, which is aperiodically triggered, to be higher than other measurement resource(s) when the measurement resource(s) related to the CSI report are between an aperiodic trigger and a relevant uplink CSI report.

17. The wireless communication method according to claim 11 , wherein

each configured measurement resource is unreported one or more times in a round robin manner, and

the measurement resource with lower priority is unreported no less than the one with higher priority.

18. The wireless communication method according to claim 11 , wherein the measurement resource is not unreported A times within the duration of N subframes, where A is an integer larger than 1, N corresponds to one plus B*periodicity of the measurement resource, and B is an integer equal to or larger than 1.

19. The wireless communication method according to claim 18 , wherein A is equal to 2, and B is equal to 1.

20. The wireless communication method according to claim 18 , wherein for the measurement resource with the lowest priority, A is equal to 3, and B is equal to 2, and for other measurement resource(s), A is equal to 2, and B is equal to 1.