User Equipment, Pdsch A/N Transmitting Method Thereof, Transmission/Reception Point, and Pdsch A/N Receiving Method Thereof

1. A user equipment configured with at least two serving cells comprising a primary cell (PCell) and a secondary cell (SCell), the PCell and the SCell having different Time Division Duplex (TDD) Uplink-Downlink (UL-DL) configurations, the user equipment comprising: a receiver to receive a physical downlink shared channel (PDSCH) transmission on the SCell; a controller to select a reference TDD configuration for the SCell; and a transmitter to transmit a first acknowledgement/negative acknowledgement (A/N), the first A/N being responsive to the PDSCH transmission on the SCell, wherein the reference TDD configuration for the SCell is determined based on a PCell TDD UL-DL configuration and SCell TDD UL-DL configuration pair in Table 1-1 below: TABLE 1-1 Reference TDD configuration for SCell determined based on a PCell TDD UL-DL configuration and SCell TDD UL-DL configuration pair PCell TDD UL-DL configuration Reference TDD configuration 0 1 2 3 4 5 6 SCell TDD 0 1 2 3 4 5 6 UL-DL configuration 1 2 4 5 2 5 3 4 5 4 5 5 6 1 2 3 4 5 where each reference TDD configuration in Table 1 indicates downlink association set indexes (K: {k 0 , k 1 , . . . k M −1 }) for a subframe ‘n’ as defined in Table 2below: TABLE 1-2 Downlink association set index K: {k 0 , k 1 , . . . k M − 1 } for TDD UL-DL Subframe ‘n’ Configuration 0 1 2 3 0 — — 6 — 1 — — 7, 6 4 2 — — 8, 7, 4, 6 — 3 — — 7, 6, 11 6, 5 4 — — 12, 8, 7, 11 6, 5, 4, 7 5 — — 13, 12, 9, 8, 7, 5, 4, 11, 6 — 6 — — 7 7 UL-DL Subframe ‘n’ Configuration 4 5 6 7 8 9 0 4 — — 6 — 4 1 — — — 7, 6 4 — 2 — — — 8, 7, 4, 6 — — 3 5, 4 — — — — — 4 — — — — — — 5 — — — — — — 6 5 — — 7 7 — where the first A/N responsive to the PDSCH transmitted in a subframe (n−k i ) (0≦i≦M−1) is transmitted in the subframe ‘n’, wherein n, k, i, and M are integers.

2. The user equipment of claim 1 , wherein the transmitter transmits a second A/N in an uplink subframe determined by a reference TDD configuration for the PCell, the second A/N being responsive to a PDSCH transmission on the PCell, wherein the reference TDD configuration for the PCell is the PCell TDD UL-DL configuration.

3. The user equipment of claim 1 , wherein the reference TDD configuration for the SCell is further determined based on a PCell TDD UL-DL configuration and SCell TDD UL-DL configuration pair in Table 1-3 below: TABLE 1-3 Reference TDD configuration for SCell determined based on a PCell TDD UL-DL configuration and SCell TDD UL-DL configuration pair PCell TDD UL-DL configuration Reference TDD configuration 0 1 2 3 4 5 6 SCell TDD 0 UL-DL configuration 1 1 4 1 2 2 2 5 5 2 3 3 4 5 3 4 4 4 5 4 4 5 5 5 5 5 5 5 6 6 .

4. A method for transmitting acknowledgement/negative acknowledgement (A/N) by a user equipment configured with at least two serving cells comprising a primary cell (PCell) and a secondary cell (SCell), the PCell and the SCell having different Time Division Duplex (TDD) Uplink-Downlink (UL-DL) configurations, the method comprising: receiving a physical downlink shared channel (PDSCH) transmission on the SCell; selecting a reference TDD configuration for the SCell; and transmitting a first A/N, the first A/N being responsive to the PDSCH transmission on the SCell, wherein the reference TDD configuration for the SCell is determined based on a PCell TDD UL-DL configuration and SCell TDD UL-DL configuration pair in Table 4-1 below: TABLE 4-1 Reference TDD configuration for SCell determined based on a PCell TDD UL-DL configuration and SCell TDD UL-DL configuration pair PCell TDD UL-DL configuration Reference TDD configuration 0 1 2 3 4 5 6 SCell TDD 0 1 2 3 4 5 6 UL-DL configuration 1 2 4 5 2 5 3 4 5 4 5 5 6 1 2 3 4 5 where each reference TDD configuration in Table 1indicates downlink association set indexes (K: {k 0 , k 1 , . . . k M−1 }) for a subframe ‘n’ as defined in Table 4-2 below: TABLE 4-2 Downlink association set index K: {k 0 , k 1 , . . . k M − 1 } for TDD UL-DL Subframe ‘n’ Configuration 0 1 2 3 4 5 6 7 8 9 0 — — 6 — 4 — — 6 — 4 1 — — 7, 6 4 — — — 7, 6 4 — 2 — — 8, 7, 4, 6 — — — — 8, 7, 4, 6 — — 3 — — 7, 6, 11 6, 5 5, 4 — — — — — 4 — — 12, 8, 7, 11 6, 5, 4, 7 — — — — — — 5 — — 13, 12, 9, 8, 7, 5, 4, 11, 6 — — — — — — — 6 — — 7 7 5 — — 7 7 — where the first A/N responsive to the PDSCH transmitted in a subframe (n−k i ) (0≦i≦M−1) is transmitted in the subframe ‘n’, wherein n, k, i, and M are integers.

5. The method of claim 4 , further comprising: transmitting a second A/N in an uplink subframe determined by a reference TDD configuration for the PCell, the second A/N being responsive to a PDSCH transmission on the PCell, wherein the reference TDD configuration for the PCell is the PCell TDD UL-DL configuration.

6. The method of claim 4 , wherein the reference TDD configuration for the SCell is further determined based on a PCell TDD UL-DL configuration and SCell TDD UL-DL configuration pair in Table 4-3 below: TABLE 4-3 Reference TDD configuration for SCell determined based on a PCell TDD UL-DL configuration and SCell TDD UL-DL configuration pair PCell TDD UL-DL configuration Reference TDD configuration 0 1 2 3 4 5 6 SCell TDD 0 UL-DL configuration 1 1 4 1 2 2 2 5 5 2 3 3 4 5 3 4 4 4 5 4 4 5 5 5 5 5 5 5 6 6.

7. A transmission/reception point that communicates with a user equipment configured with at least two serving cells comprising a primary cell (PCell) and a secondary cell (SCell), the PCell and the SCell having different Time Division Duplex (TDD) Uplink-Downlink (UL-DL) configurations, the transmission/reception point comprising: a controller to select a reference TDD configuration for the SCell; and a receiver to receive a first acknowledgement/negative acknowledgement (A/N) from the user equipment, the first A/N being responsive to a physical downlink shared channel (PDSCH) transmission on the SCell, wherein the reference TDD configuration for the SCell is determined based on a PCell TDD UL-DL configuration and SCell TDD UL-DL configuration pair in Table 7-1 below: TABLE 7-1 Reference TDD configuration for SCell determined based on a PCell TDD UL-DL configuration and SCell TDD UL-DL configuration pair PCell TDD UL-DL configuration Reference TDD configuration 0 1 2 3 4 5 6 SCell TDD 0 1 2 3 4 5 6 UL-DL configuration 1 2 4 5 2 5 3 4 5 4 5 5 6 1 2 3 4 5 where each reference TDD configuration in Table 7-1 indicates downlink association set indexes (K: {k 0 , k 1 , . . . k M−1 }) for a subframe ‘n’ as defined in Table 7-2 below: TABLE 7-2 Downlink association set index K: {k 0 , k 1 , . . . k M − 1 } for TDD UL-DL Subframe ‘n’ Configuration 0 1 2 3 4 5 6 7 8 9 0 — — 6 — 4 — — 6 — 4 1 — — 7, 6 4 — — — 7, 6 4 — 2 — — 8, 7, 4, 6 — — — — 8, 7, 4, 6 — — 3 — — 7, 6, 11 6, 5 5, 4 — — — — — 4 — — 12, 8, 7, 11 6, 5, 4, 7 — — — — — — 5 — — 13, 12, 9, 8, 7, 5, 4, 11, 6 — — — — — — — 6 — — 7 7 5 — — 7 7 — where the first A/N responsive to the PDSCH transmitted in a subframe (n−k i ) (0≦i≦M−1) is transmitted in the subframe ‘n’, wherein n, k, i, and M are integers.

8. The transmission/reception point of claim 7 , wherein the receiver receives a second A/N from the user equipment in an uplink subframe determined by a reference TDD configuration for the PCell, the second A/N being responsive to a PDSCH transmission on the PCell, wherein the reference TDD configuration for the PCell is the PCell TDD UL-DL configuration.

9. The transmission/reception point of claim 7 , wherein the reference TDD configuration for the SCell is further determined based on a PCell TDD UL-DL configuration and SCell TDD UL-DL configuration pair in Table 7-3 below: TABLE 7-3 Reference TDD configuration for SCell determined based on a PCell TDD UL-DL configuration and SCell TDD UL-DL configuration pair PCell TDD UL-DL configuration Reference TDD configuration 0 1 2 3 4 5 6 SCell TDD 0 UL-DL configuration 1 1 4 1 2 2 2 5 5 2 3 3 4 5 3 4 4 4 5 4 4 5 5 5 5 5 5 5 6 6.

10. A method for receiving acknowledgement/negative acknowledgement (A/N) by a transmission/reception point that communicates with a user equipment configured with at least two serving cells comprising a primary cell (PCell) and a secondary cell (SCell), the PCell and the SCell having different Time Division Duplex (TDD) Uplink-Downlink (UL-DL) configurations, the method comprising: selecting a reference TDD configuration for the SCell; and receiving a first A/N from the user equipment, the first A/N being responsive to a physical downlink shared channel (PDSCH) transmission on the SCell, wherein the reference TDD configuration for the SCell is determined based on a PCell TDD UL-DL configuration and SCell TDD UL-DL configuration pair in Table 10-1 below: TABLE 10-1 Reference TDD configuration for SCell determined based on a PCell TDD UL-DL configuration and SCell TDD UL-DL configuration pair PCell TDD UL-DL configuration Reference TDD configuration 0 1 2 3 4 5 6 SCell TDD 0 1 2 3 4 5 6 UL-DL configuration 1 2 4 5 2 5 3 4 5 4 5 5 6 1 2 3 4 5 where each reference TDD configuration in Table 1indicates downlink association set indexes (K: {k 0 , k 1 , . . . k M −1 }) for a subframe ‘n’ as defined in Table 10-2below: TABLE 10-2 Downlink association set index K: {k 0 , k 1 , . . . k M − 1 } for TDD UL-DL Subframe ‘n’ Configuration 0 1 2 3 4 5 6 7 8 9 0 — — 6 — 4 — — 6 — 4 1 — — 7, 6 4 — — — 7, 6 4 — 2 — — 8, 7, 4, 6 — — — — 8, 7, 4, 6 — — 3 — — 7, 6, 11 6, 5 5, 4 — — — — — 4 — — 12, 8, 7, 11 6, 5, 4, 7 — — — — — — 5 — — 13, 12, 9, 8, 7, 5, 4, 11, 6 — — — — — — — 6 — — 7 7 5 — — 7 7 — where the first A/N responsive to the PDSCH transmitted in a subframe (n−k i ) (0≦i≦M−1) is transmitted in the subframe ‘n’, wherein n, k, i, and M are integers.

11. The method of claim 10 , further comprising: receiving a second A/N from the user equipment in an uplink subframe determined by a reference TDD configuration for the PCell, the second A/N being responsive to a PDSCH transmission on the PCell, wherein the reference TDD configuration for the PCell is the PCell TDD UL-DL configuration.

12. The method of claim 10 , wherein the reference TDD configuration for the SCell is further determined based on a PCell TDD UL-DL configuration and SCell TDD UL-DL configuration pair in Table 10-3 below: TABLE 10-3 Reference TDD configuration for SCell determined based on a PCell TDD UL-DL configuration and SCell TDD UL-DL configuration pair PCell TDD UL-DL configuration Reference TDD configuration 0 1 2 3 4 5 6 SCell TDD 0 UL-DL configuration 1 1 4 1 2 2 2 5 5 2 3 3 4 5 3 4 4 4 5 4 4 5 5 5 5 5 5 5 6 6.

13. A method for transmitting acknowledgement/negative acknowledgement (A/N) by a user equipment configured with at least two serving cells, the at least two serving cells comprising a primary cell (PCell) and a secondary cell (SCell), and the PCell and the SCell having different Time Division Duplex (TDD) Uplink-Downlink (UL-DL) configurations, the method comprising: receiving a physical downlink shared channel (PDSCH) transmission on the SCell in a subframe ‘n−k i ’; determining the interval ‘k i ’ between the reception of the PDSCH transmission on the SCell and a responsive A/N transmission, the interval being determined based on a reference TDD configuration for the SCell; and transmitting the A/N responsive to the PDSCH transmission on the SCell in a subframe ‘n’ according to the interval, wherein the reference TDD configuration for the SCell is determined based on a PCell TDD UL-DL configuration and SCell TDD UL-DL configuration pair, wherein the PCell TDD UL-DL configuration and the SCell TDD UL-DL configuration are selected from among TDD UL-DL configurations defined in Table 13-1 below: TABLE 13-1 TDD UL-DL configurations Downlink- to- Uplink- Uplink downlink Switch- config- point Subframe number uration periodicity 0 1 2 3 4 5 6 7 8 9 0 5 ms D S U U U D S U U U 1 5 ms D S U U D D S U U D 2 5 ms D S U D D D S U D D 3 10 ms D S U U U D D D D D 4 10 ms D S U U D D D D D D 5 10 ms D S U D D D D D D D 6 5 ms D S U U U D S U U D where D denotes a downlink subframe, S denotes a special subframe, and U denotes an uplink subframe, wherein the reference TDD configuration is determined according to Table 13-2 below: TABLE 13-2 Reference TDD configuration for SCell determined based on a PCell TDD UL-DL configuration and SCell TDD UL-DL configuration pair Reference TDD (PCell TDD UL-DL configuration, SCell TDD configuration UL-DL configuration) 1 (1, 0), (1, 6) 2 (2, 0), (2, 1), (2, 6) 3 (3, 0), (3, 6) 4 (4, 0), (4, 1), (4, 3), (4, 6) 5 (5, 0), (5, 1), (5, 2), (5, 3), (5, 4), (5, 6) 6 (6, 0), and wherein n, k, and i are integers.

14. The method of claim 13 , wherein the interval ‘k i ’εK, and K: {k 0 , k 1 , k M−1 } for the subframe ‘n’ is defined in Table 13-3 below: TABLE 13-3 Downlink association set index K: {k 0 , k 1 , . . . K M − 1 } for TDD UL-DL Subframe ‘n’ Configuration 0 1 2 3 4 5 6 7 8 9 0 — — 6 — 4 — — 6 — 4 1 — — 7, 6 4 — — — 7, 6 4 — 2 — — 8, 7, 4, 6 — — — — 8, 7, 4, 6 — — 3 — — 7, 6, 11 6, 5 5, 4 — — — — — 4 — — 12, 8, 7, 11 6, 5, 4, 7 — — — — — — 5 — — 13, 12, 9, 8, 7, 5, 4, 11, 6 — — — — — — — 6 — — 7 7 5 — — 7 7 — where the A/N responsive to the PDSCH transmitted in the subframe (n−k i ) (0 ≦i≦M−1) is transmitted in the subframe ‘n’, wherein K is a set of integers and M is an integer.

15. The method of claim 14 , wherein the reference TDD configuration is determined according to Table 13-4 below: TABLE 13-4 Reference TDD configuration for SCell determined based on a PCell TDD UL-DL configuration and SCell TDD UL-DL configuration pair Reference TDD (PCell TDD UL-DL configuration, SCell TDD configuration UL-DL configuration) 1 (0, 1), (6, 1) 2 (0, 2), (1, 2), (6, 2) 3 (0, 3), (6, 3) 4 (0, 4), (1, 4), (3, 4), (6, 4), (3, 1), (1, 3) 5 (0, 5), (1, 5), (2, 5), (3, 5), (4, 5), (6, 5), (3, 2), (4, 2), (2, 3), (2, 4) 6 (0, 6).