Method and apparatus for transmitting/receiving channel state information

1. A method for transmitting Channel State Information (CSI) report in a wireless network where a plurality of cells is configured to cooperate for a User Equipment (UE) with Carrier aggregation (CA), the method comprising:

detecting a collision in a subframe, between a first Physical Uplink Control Channel (PUCCH) CSI report of one serving cell with which the UE is configured in one of transmission modes 1 to 9, and a second PUCCH CSI report of another serving cell with which the UE is configured in transmission mode 10;

comparing the priorities of reporting types of the collided PUCCH CSI reports; and

upon the reporting types of the collided PUCCH CSI reports having a same priority, transmitting the first PUCCH CSI report if a CSI process index of the second PUCCH CSI report has a positive value other than 1.

2. The method of claim 1 , further comprising:

dropping the PUCCH CSI report(s) with a higher serving cell index(es) other than the PUCCH CSI report with the lowest serving cell index if the CSI process index of the second CSI report is equal to 1.

3. The method of claim 1 , further comprising:

dropping the second PUCCH CSI report of another serving cell with which the UE is configured in transmission mode 10.

4. An apparatus for transmitting Channel State Information (CSI) report in a wireless network where a plurality of cells is configured to cooperate for a User Equipment (UE) with Carrier aggregation (CA), the apparatus comprising a processing circuitry configured to:

detect a collision in a frame, between a first Physical Uplink Control Channel (PUCCH) CSI report of one serving cell with which the UE is configured in one of transmission modes 1 to 9, and a second PUCCH CSI report of another serving cell with which the UE is configured in transmission mode 10;

compare the priorities of reporting types of the collided PUCCH CSI reports; and

upon the reporting types of the collided PUCCH CSI reports having a same priority, transmit the first PUCCH CSI report if the CSI process index of the second PUCCH CSI report has a positive value other than 1.

5. The apparatus of claim 4 , wherein the processing circuitry is further configured to:

drop the PUCCH CSI report(s) with a higher serving cell index(es) other than the PUCCH CSI report with the lowest serving cell index if the CSI process index of the second CSI report is equal to 1.

6. The apparatus of claim 4 , wherein the processing circuitry is further configured to:

drop the second PUCCH CSI report of another serving cell with which the UE is configured in transmission mode 10.

7. An apparatus for receiving Channel State Information (CSI) report in a wireless network where a plurality of cells is configured to cooperate for a User Equipment (UE) with Carrier aggregation (CA), the apparatus comprising a processing circuitry configured to:

detect a collision in a frame, between a first Physical Uplink Control Channel (PUCCH) CSI report of one serving cell with which the UE is configured in one of transmission modes 1 to 9, and a second PUCCH CSI report of another serving cell with which the UE is configured in transmission mode 10;

compare the priorities of reporting types of the collided PUCCH CSI reports; and

upon the reporting types of the collided CSI reports having a same priority, configure the UE to transmit the first PUCCH CSI report if the CSI process index of the second PUCCH CSI report has a positive value other than 1.

8. The apparatus of claim 7 , wherein the processing circuitry is further configured to:

receive a PUCCH CSI report with a smaller serving cell index between the first and the second CSI reports if the CSI process index of the second CSI report is equal to 1.

9. The apparatus of claim 7 , wherein the processing circuitry is further configured to:

configure the UE to drop the second PUCCH CSI report of another serving cell with which the UE is configured in transmission mode 10.

10. A method for receiving Channel State Information (CSI) report in a wireless network where a plurality of cells is configured to cooperate for a User Equipment (UE) with Carrier aggregation (CA), the method comprising:

detecting a collision in a frame, between a first Physical Uplink Control Channel (PUCCH) CSI report of one serving cell with which the UE is configured in one of transmission modes 1 to 9, and a second PUCCH CSI report of another serving cell with which the UE is configured in transmission mode 10;

comparing the priorities of reporting types of the collided PUCCH CSI reports; and

upon the reporting types of the collided PUCCH CSI reports having a same priority, configuring the UE to transmit the first PUCCH CSI report if the CSI process index of the second PUCCH CSI report has a positive value other than 1.

11. The method of claim 10 , wherein the processing circuitry is further configured to:

drop the PUCCH CSI report(s) with a higher serving cell index(es) other than the PUCCH CSI report with the lowest serving cell index if the CSI process index of the second CSI report is equal to 1.

12. The method of claim 10 , wherein the processing circuitry is further configured to:

configure the UE to drop the second PUCCH CSI report of another serving cell with which the UE is configured in transmission mode 10.

13. A method for receiving Channel State Information (CSI) report in a wireless network where a plurality of cells is configured to cooperate for a User Equipment (UE) with Carrier aggregation (CA), the method comprising:

configuring, via a higher layer, the UE configured in transmission mode 10

whether to create a respective CSI report(s) for each aperiodic CSI process or not, using an information element including at least three one-bit variables,

wherein the at least three one-bit variables include a trigger01-r11 corresponding, to a state ‘01’ of a CSI request field, a trigger10-r11 corresponding to a state ‘10’ of the CSI request field, and a trigger11-r11 corresponding to a state ‘11’ of the CSI request field, and

wherein the CSI request field is conveyed in a uplink DCI format that schedules a Physical Uplink Shared CHannel (PUSCH) for a serving cell.

14. The method of claim 13 , wherein the state ‘01’ indicates that aperiodic CSI report is triggered for a set of CSI process(es) configured by the higher layer, the state ‘10’ indicates that aperiodic CSI report is triggered for a first set of CSI process(es) configured by the higher layer, and the state ‘11’ indicates that aperiodic CSI report is triggered for a second set of CSI process(es) configured by the higher layer.

15. The method of claim 13 , wherein the one-bit variable has either a value of ‘0’ indicating that no aperiodic CSI report is triggered, or a value of ‘1’ indicating an aperiodic CSI report is triggered.

16. An apparatus for receiving Channel State Information (CSI) report in a wireless network where a plurality of cells is configured to cooperate for a User Equipment (UE) configured in transmission mode 10 with Carrier aggregation (CA), the apparatus comprising a processing circuitry configured to:

configure, via a higher layer, the UE whether to create a respective CSI report(s) for each aperiodic CSI process or not, using an information element including at least three one-bit variables,

wherein the at least three one-bit variables include a trigger01-r11 corresponding, to a state ‘01’ of a CSI request field, a trigger10-r11 corresponding to a state ‘10’ of the CSI request field, and a trigger11-r11 corresponding to a state ‘11’ of the CSI request field, and

wherein the CSI request field is conveyed in a uplink DCI format that schedules a Physical Uplink Shared CHannel (PUSCH) for a serving cell.

17. The apparatus of claim 16 , wherein the state ‘01’ indicates that aperiodic CSI report is triggered for a set of CSI process(es) configured by the higher layer, the state ‘10’ indicates that aperiodic CSI report is triggered for a first set of CSI process(es) configured by the higher layer, and the state ‘11’ indicates that aperiodic CSI report is triggered for a second set of CSI process(es) configured by the higher layer.

18. The apparatus of claim 16 , wherein the one-bit variable has either a value of ‘0’ indicating that no aperiodic CSI report is triggered, or a value of ‘1’ indicating an aperiodic CSI report is triggered.

19. An apparatus for transmitting Channel State Information (CSI) report in a wireless network where a plurality of cells is configured to cooperate for a User Equipment (UE) configured in transmission mode 10 with Carrier aggregation (CA), the UE comprising a processing circuitry configured to:

receive a configuration of a higher layer whether to create a respective CSI report(s) for each aperiodic CSI process or not, using an information element including at least three one-bit variables,

wherein the at least three one-bit variables include a trigger01-r11 corresponding to a state ‘01’ of a CSI request field, a trigger10-r11 corresponding to a state ‘10’ of the CSI request field of, and a trigger11-r11 corresponding to a state ‘11’ of the CSI request field, and

wherein the CSI request field is conveyed in a uplink DCI format that schedules a Physical Uplink Shared CHannel (PUSCH) for a serving cell.

20. The apparatus of claim 19 , wherein the state ‘01’ indicates that aperiodic CSI report is triggered for a set of CSI process(es) configured by the higher layer, the state ‘10’ indicates that aperiodic CSI report is triggered for a first set of CSI process(es) configured by the higher layer, and the state ‘11’ indicates that aperiodic CSI report is triggered for a second set of CSI process(es) configured by the higher layer.

21. The apparatus of claim 19 , wherein the one-bit variable has either a value of ‘0’ indicating that no aperiodic CSI report is triggered, or a value of ‘1’ indicating an aperiodic CSI report is triggered.