Method and apparatus for transmitting ACK/NACK
View Patent ↗A technology enabling a terminal to receive acknowledgement (ACK)/negative ACK (NACK) information about data transmitted from the terminal is provided. The method includes receiving cyclic shift information for a reference signal from the base station; transmitting, to the base station, the data and a reference signal which is cyclic-shifted using a cyclic shift value, the cyclic shift value being determined based on a dynamic cyclic shift value mapped one-to-one to the cyclic shift information for the reference signal; and receiving, from the base station, the ACK/NACK information about the transmitted data through a radio resource of a downlink channel, the radio resource of the downlink channel being identified based on a modifier mapped one-to-one to the cyclic shift information for the reference signal.
1. A communication method performed by an e-Node B (eNB), the method comprising:
causing the eNB to transmit cyclic shift information for reference signal to a user equipment (UE);
causing the eNB to receive data and a reference signal using one or more uplink radio resources; and
causing the eNB to transmit an acknowledgement for the transmitted data using a Physical Hybrid ARQ Indicator Channel (PHICH) resource,
wherein the received reference signal is cyclically shifted at least based on a dynamic cyclic shift value,
the dynamic cyclic shift value is determined at least based on the cyclic shift information for reference signal according to Table 1, and
the PHICH resource is determined at least based on the cyclic shift information for reference signal
TABLE 1
cyclic shift information for
dynamic cyclic
reference signal
shift value
000
0
001
6
010
3
011
4
100
2
101
8
110
10
111
9.
2. The method of claim 1 , wherein the PHICH resource is determined at least based on an identifier, and the identifier is determined at least based on the cyclic shift information for reference signal according to Table 2
TABLE 2
cyclic shift information for
reference signal
Identifier
000
0
001
1
010
2
011
3
100
4
101
5
110
6
111
7.
3. The method of claim 2 , wherein at least one modulo-four operation is performed in determining the PHICH resource.
4. The method of claim 2 , wherein a mapping according to Table 2 prevents collision of downlink radio sources obtained based on a modulo-four operation.
5. The method of claim 1 , wherein the reference signal is a Demodulation Reference signal (DMRS).
6. The method of claim 1 , wherein the cyclic shift information for reference signal is transmitted by DCI (Downlink Control Information) format 0.
7. A communication apparatus, comprising:
a circuitry which is configured to:
cause the apparatus to transmit cyclic shift information for reference signal to a user equipment (UE);
cause the apparatus to receive data and a reference signal using one or more uplink radio resources; and
cause the apparatus to transmit an acknowledgement for the transmitted data using a Physical Hybrid ARQ Indicator Channel (PHICH) resource,
wherein the received reference signal is cyclically shifted at least based on a dynamic cyclic shift value,
the dynamic cyclic shift value is determined at least based on the cyclic shift information for reference signal according to Table 3, and
the PHICH resource is determined at least based on the cyclic shift information for reference signal
TABLE 3
cyclic shift information for
dynamic cyclic
reference signal
shift value
000
0
001
6
010
3
011
4
100
2
101
8
110
10
111
9.
8. The apparatus of claim 7 , wherein the PHICH resource is determined at least based on an identifier, and the identifier is determined at least based on the cyclic shift information for reference signal according to Table 4
TABLE 4
cyclic shift information for
reference signal
Identifier
000
0
001
1
010
2
011
3
100
4
101
5
110
6
111
7.
9. The apparatus of claim 8 , wherein at least one modulo-four operation is performed in determining the PHICH resource.
10. The apparatus of claim 8 , wherein a mapping according to Table 4 prevents collision of downlink radio sources obtained based on a modulo-four operation.
11. The apparatus of claim 7 , wherein the reference signal is a Demodulation Reference signal (DMRS).
12. The apparatus of claim 7 , wherein the cyclic shift information for reference signal is transmitted by DCI (Downlink Control Information) format 0.
13. A device for an e-Node B (eNB), comprising:
a circuitry which is configured to:
cause the eNB to transmit cyclic shift information for reference signal to a user equipment (UE);
cause the eNB to receive data and a reference signal using one or more uplink radio resources; and
cause the eNB to transmit an acknowledgement for the transmitted data using a Physical Hybrid ARQ Indicator Channel (PHICH) resource,
wherein the received reference signal is cyclically shifted at least based on a dynamic cyclic shift value,
the dynamic cyclic shift value is determined at least based on the cyclic shift information for reference signal according to Table 5, and
the PHICH resource is determined at least based on the cyclic shift information for reference signal
TABLE 5
cyclic shift information for
dynamic cyclic
reference signal
shift value
000
0
001
6
010
3
011
4
100
2
101
8
110
10
111
9.
14. The apparatus of claim 13 , wherein the PHICH resource is determined at least based on an identifier, and the identifier is determined at least based on the cyclic shift information for reference signal according to Table 6
TABLE 6
cyclic shift information for
reference signal
Identifier
000
0
001
1
010
2
011
3
100
4
101
5
110
6
111
7.
15. The apparatus of claim 14 , wherein at least one modulo-four operation is performed in determining the PHICH resource.
16. The apparatus of claim 14 , wherein a mapping according to Table 6 prevents collision of downlink radio sources obtained based on a modulo-four operation.
17. The apparatus of claim 13 , wherein the reference signal is a Demodulation Reference signal (DMRS).
18. The apparatus of claim 13 , wherein the cyclic shift information for reference signal is transmitted by DCI (Downlink Control Information) format 0.