Method and apparatus for reporting channel state information

1. A method performed by a device, the method comprising:

determining whether to

monitor a first set of control decoding candidates that schedule communications of a first transmit time interval length in a subframe if the device is not configured to communicate using a second transmit time interval length in the subframe or

monitor a second set of control decoding candidates that schedule communications of the first transmit time interval length in the subframe if the device is configured to communicate using the second transmit time interval length in the subframe;

monitoring, in response to the determining whether to monitor, the first set of control decoding candidates in the subframe

when the device is not configured to communicate using the second transmit time interval length in the subframe,

wherein the second transmit time interval length is shorter than the first transmit time interval length; and

monitoring, in response to the determining whether to monitor, the second set of control decoding candidates in the subframe

when the device is configured to communicate using the second transmit time interval length in the subframe,

wherein the first and the second sets are different, and

wherein a number of candidates in the second set is less than a number of candidates in the first set.

2. The method according to claim 1 , further comprising monitoring a third set of control decoding candidates that schedule communications in a transmit time interval of the second transmit time interval length in at least a first portion of the subframe when the device is configured to communicate using the second transmit time interval length in the subframe, where a length of the first portion of the subframe is less than the entire length of the subframe.

3. The method according to claim 2 , further comprising monitoring a fourth set of control decoding candidates that schedule communications in the transmit time interval of the second transmit time interval length in at least a second portion of the subframe when the device is configured to communicate using the second transmit time interval length in the subframe, where the second portion is different than the first portion.

4. The method according to claim 3 , wherein the number of candidates in the fourth set of control decoding candidates is larger than the number of candidates in the third set of control decoding candidates.

5. The method according to claim 3 ,

wherein the first portion of the subframe corresponds to a first transmit time interval with a length associated with the second transmit time interval length, and

wherein the second portion of the subframe corresponds to a second transmit time interval different from the first transmit time interval, where the second transmit time interval has a length associated with the second transmit time interval length.

6. The method according to claim 3 ,

wherein the first portion of the subframe corresponds to a first slot of the subframe and the second portion of the subframe corresponds to a second slot of the subframe, and

wherein the subframe comprises two slots.

7. The method according to claim 6 , wherein the second set of control decoding candidates corresponding to the first transmit time interval length in the subframe is monitored in the first slot of the subframe.

8. The method according to claim 7 , wherein a difference between a number of candidates in the fourth set and a sum of the number of candidates in the second set and a number of candidates in the third set is at most a non-negative number.

9. The method according to claim 8 , wherein the non-negative number is equal to the number of transmit time intervals in the first portion of the subframe or the number of transmit time intervals in the second portion of the subframe.

10. The method according to claim 1 , wherein the second set is a proper subset of the first set.

11. The method according to claim 1 , wherein the first transmit time interval length is a length of a subframe.

12. The method according to claim 1 , wherein determining whether to monitor the second set comprises determining whether to monitor the second set of control decoding candidates that schedule communications of the first transmit time interval length in the subframe if the device is configured to communicate using the second transmit time interval length in addition to using the first transmit time interval length in the subframe.

13. An apparatus comprising:

a transceiver that transmits and receives signals in subframes over a wireless network; and

a controller that

determines whether to

monitor a first set of control decoding candidates that schedule communications of a first transmit time interval length in a subframe if the apparatus is not configured to communicate using a second transmit time interval length in the subframe or

monitor a second set of control decoding candidates that schedule communications of the first transmit time interval length in the subframe if the apparatus is configured to communicate using the second transmit time interval length in the subframe,

monitors, in response to determining whether to monitor, the first set of control decoding candidates in the subframe when the apparatus is not configured to communicate using the second transmit time interval length in the subframe, wherein the second transmit time interval length is shorter than the first transmit time interval length, and

monitors, in response to determining whether to monitor, the second set of control decoding candidates in the subframe,

wherein the first set and the second set are different, and

wherein a number of candidates in the second set is less than a number of candidates in the first set.

14. The apparatus according to claim 13 , wherein the controller monitors a third set of control decoding candidates that schedule communications in a transmit time interval of the second transmit time interval length in at least a first portion of the subframe when the apparatus is configured to communicate using the second transmit time interval length in the subframe, where a length of the first portion of the subframe is less than the entire length of the subframe.

15. The apparatus according to claim 14 , wherein the controller monitors a fourth set of control decoding candidates that schedule communications in the transmit time interval of the second transmit time interval length in at least a second portion of the subframe when the apparatus is configured to communicate using the second transmit time interval length in the subframe, wherein the second portion is different than the first portion.

16. The apparatus according to claim 15 , wherein a number of candidates in the fourth set of control decoding candidates is larger than a number of candidates in the third set of control decoding candidates.

17. The apparatus according to claim 15 ,

wherein the first portion of the subframe corresponds to a first transmit time interval with a length associated with the second transmit time interval length, and

wherein the second portion of the subframe corresponds to a second transmit time interval different from the first transmit time interval, where the second transmit time interval has a length associated with the second transmit time interval length.

18. The apparatus according to claim 15 ,

wherein the first portion of the subframe corresponds to a first slot of the subframe and the second portion of the subframe corresponds to a second slot of the subframe, and

wherein the subframe comprises two slots.

19. The apparatus according to claim 18 , wherein the second set of control decoding candidates corresponding to the first transmit time interval length in the subframe is monitored in the first slot of the subframe.

20. The apparatus according to claim 19 , wherein a difference between a number of candidates in the fourth set and a sum of the number of candidates in the second set and a number of candidates in the third set is at most a non-negative number.

21. The apparatus according to claim 20 , wherein the non-negative number is equal to the number of transmit time intervals in the first portion of the subframe or the number of transmit time intervals in the second portion of the subframe.

22. The apparatus according to claim 13 , wherein the controller determines whether to monitor the second set by determining whether to monitor the second set of control decoding candidates that schedule communications of the first transmit time interval length in the subframe if the apparatus is configured to communicate using the second transmit time interval length in the subframe in addition to using the first transmit time interval length in the subframe.