Method and apparatus for handling TDD frame for short TTI in wireless communication system

1. A method for communicating with a user equipment (UE) in a wireless communication system, the method performed by an eNodeB (eNB) and comprising:

configuring a time division duplex (TDD) frame including a set of short downlink (DL) TTIs and a set of short uplink (UL) TTIs; and

communicating with the UE based on the TDD frame,

wherein a length of a short DL TTI and a length of a short UL TTI are less than 1 ms,

wherein the TDD frame is configured for a complementary carrier, which is located between a first regular carrier and a second regular carrier in a frequency domain,

wherein the complementary carrier, the first regular carrier and the second regular carrier are divided from a legacy carrier, and

wherein the TDD frame includes at least one short DL TTI overlapping with a UL resource allocated for the first regular carrier and the second regular carrier in a time domain.

2. The method of claim 1 , wherein the TDD frame is configured based on a legacy UL-DL configuration.

3. The method of claim 2 , wherein the TDD frame includes a fixed DL portion.

4. The method of claim 1 , wherein the TDD frame is configured for a plurality of carriers.

5. The method of claim 4 , wherein a timing of one carrier among the plurality of carriers is shifted for other carriers among the plurality of carriers.

6. The method of claim 1 , wherein the TDD frame is configured for a part of a carrier used for full-duplex eNB.

7. The method of claim 6 , wherein the other part of the carrier is used for a legacy UE incapable of communicating based on the short DL TTI and the short UL TTI.

8. The method of claim 1 , wherein the first regular carrier and the second regular carrier are configured with different UL-DL configuration from the complementary carrier.

9. The method of claim 1 , wherein every subframe in the TDD frame has switching points between the set of short DL TTIs and the set of short UL TTIs.

10. An eNodeB (eNB) in a wireless communication system, the eNB comprising:

a memory;

a transceiver; and

a processor operatively coupled to the memory and the transceiver, the processor being configured to:

configure a time division duplex (TDD) including a set of short downlink (DL) transmission time intervals (TTIs) and a set of short uplink (UL) TTIs, and

control the transceiver to communicate with a user equipment (UE) based on the TDD frame,

wherein a length of a short DL TTI and a length of a short UL TTI are less than 1 ms,

wherein the TDD frame is configured for a complementary carrier, which is located between a first regular carrier and a second regular carrier in a frequency domain,

wherein the complementary carrier, the first regular carrier and the second regular carrier are divided from a legacy carrier, and

wherein the TDD frame includes at least one short DL TTI overlapping with a UL resource allocated for the first regular carrier and the second regular carrier in a time domain.

11. The eNB of claim 10 , wherein the TDD frame is configured based on a legacy UL-DL configuration.

12. The eNB of claim 11 , wherein the TDD frame includes a fixed DL portion.

13. The eNB of claim 10 , wherein the TDD frame is configured for a plurality of carriers.

14. The eNB of claim 13 , wherein a timing of one carrier among the plurality of carriers is shifted for other carriers among the plurality of carriers.

15. The eNB of claim 10 , wherein the TDD frame is configured for a part of a carrier used for full-duplex eNB.

16. The eNB of claim 15 , wherein the other part of the carrier is used for a legacy UE incapable of communicating based on the short DL TTI and the short UL TTI.

17. The eNB of claim 10 , wherein the first regular carrier and the second regular carrier are configured with different UL-DL configuration from the complementary carrier.

18. The eNB of claim 10 , wherein every subframe in the TDD frame has switching points between the set of short DL TTIs and the set of short UL TTIs.