Device and method of handling channel status information reports for transmission time intervals

1. A communication device for handling channel status information (CSI) reports for transmission time intervals (TTIs), comprising:

a storage device, for storing instructions of:

receiving a downlink (DL) control information (DCI) from a network, wherein the DCI comprises a CSI request indicating a CSI reporting for at least one serving cell of the network; and

transmitting a first CSI report for a DL normal TTI (nTTI) of the at least one serving cell and a second CSI report for a DL shortened TTI (sTTI) of the at least one serving cell according to the CSI request to the network;

wherein the communication device transmits the first CSI report and the second CSI report according to an order information;

wherein the order information is predetermined, or is determined according to at least one cell identity (ID) of the at least one serving cell; and

a processing circuit, coupled to the storage device, configured to execute the instructions stored in the storage device.

2. The communication device of claim 1 , wherein the communication device transmits the first CSI report and the second CSI report in a physical uplink (UL) shared channel (PUSCH) of a UL nTTI scheduled by the DCI.

3. The communication device of claim 1 , wherein the communication device transmits the first CSI report and the second CSI report in a shortened PUSCH (sPUSCH) of a UL sTTI scheduled by the DCI.

4. The communication device of claim 1 , wherein the first CSI report and the second CSI report are aperiodic CSI reports.

5. The communication device of claim 1 , wherein the DCI is a normal DCI (nDCI) for scheduling a PUSCH of a UL nTTI.

6. The communication device of claim 1 , wherein the DCI is a shortened DCI (sDCI) for scheduling a sPUSCH of a UL sTTI.

7. The communication device of claim 1 , wherein the communication device transmits the first CSI report and the second CSI report, if the CSI request indicates the CSI reporting of the first CSI report and the second CSI report.

8. The communication device of claim 1 , wherein the storage device further stores the instruction of:

determining the first CSI report according to the DL nTTI and the at least one serving cell; and

determining the second CSI report according to the DL sTTI and the at least one serving cell.

9. The communication device of claim 1 , wherein a length of the DL sTTI is not greater than a half length of the DL nTTI.

10. The communication device of claim 1 , wherein the at least one serving cell is configured with a sTTI operation.

11. The communication device of claim 1 , wherein the at least one serving cell is configured by a higher layer signaling.

12. The communication device of claim 1 , wherein the storage device stores instructions of:

performing a first channel measurement for the DL nTTI according to a first reference signal, to obtain the first CSI report; and

performing a second channel measurement for the DL sTTI according to a second reference signal, to obtain the second CSI report.

13. A communication device for handling channel status information (CSI) reports for transmission time intervals (TTIs), comprising:

a storage device, for storing instructions of:

receiving a downlink (DL) control information (DCI) from a network, wherein the DCI comprises a CSI request indicating a CSI reporting; and

transmitting one of a first CSI report for a DL normal TTI (nTTI) of at least one first serving cell and a second CSI report for a DL shortened TTI (sTTI) of at least one second serving cell according to the CSI request to the network;

wherein the communication device transmits the one of the first CSI report and the second CSI report, if the CSI request indicates the CSI reporting of the one of the first CSI report and the second CSI report; and

a processing circuit, coupled to the storage device, configured to execute the instructions stored in the storage device.

14. The communication device of claim 13 , wherein the communication device transmits the one of the first CSI report and the second CSI report in a physical uplink (UL) shared channel (PUSCH) of a UL nTTI scheduled by the DCI.

15. The communication device of claim 13 , wherein the communication device transmits the one of the first CSI report and the second CSI report in a shortened PUSCH (sPUSCH) of a UL sTTI scheduled by the DCI.

16. The communication device of claim 13 , wherein the one of the first CSI report and the second CSI report is an aperiodic CSI report.

17. The communication device of claim 13 , wherein the DCI is a normal DCI (nDCI) for scheduling a PUSCH of a UL nTTI.

18. The communication device of claim 13 , wherein the DCI is a shortened DCI (sDCI) for scheduling a sPUSCH of a UL sTTI.

19. The communication device of claim 13 , wherein the one of the first CSI report and the second CSI report is the first CSI report.

20. The communication device of claim 13 , wherein the one of the first CSI report and the second CSI report is the second CSI report.

21. The communication device of claim 13 , wherein the storage device further stores the instruction of:

determining the first CSI report according to the DL nTTI and the at least one first serving cell; or

determining the second CSI report according to the DL sTTI and the at least one second serving cell.

22. The communication device of claim 13 , wherein a length of the DL sTTI is not greater than a half length of the DL nTTI.

23. The communication device of claim 13 , wherein the at least one second serving cell is configured with a sTTI operation.

24. The communication device of claim 13 , wherein the at least one first serving cell is configured by a higher layer signaling.

25. The communication device of claim 13 , wherein the at least one second serving cell is configured by a higher layer signaling.

26. The communication device of claim 13 , wherein the storage device stores instructions of:

performing a first channel measurement for the DL nTTI according to a first reference signal, to obtain the first CSI report; or

performing a second channel measurement for the DL sTTI according to a second reference signal, to obtain the second CSI report.