Method and apparatus for transmitting ACK/NACK
View Patent ↗A technology enabling a base station to transmit acknowledgement (ACK)/negative ACK (NACK) information about data received from a terminal is provided. A cyclic shift value difference of each terminal may be maximized and a radio resource for transmitting the ACK/NACK information may be assigned without collision.
1. A communication method performed by a user equipment (UE), the method comprising:
receiving, at the UE, cyclic shift information for reference signal;
determining, at the UE, a dynamic cyclic shift value based on the cyclic shift information for reference signal;
generating, at the UE, a reference signal by cyclically shifting a sequence at least based on the dynamic cyclic shift value;
transmitting, at the UE, data and the reference signal using one or more uplink radio resources; and
receiving, at the UE, Acknowledgement/Negative Acknowledgement (ACK/NACK) for the transmitted data using a Physical Hybrid ARQ Indicator Channel (PHICH) resource,
wherein the dynamic cyclic shift value is determined 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
reference signal
cyclic 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 a mapping according to Table 1 prevents collision of the PHICH resource obtained based on a modulo-four operation.
3. The method of claim 1 , further comprising:
determining a modifier based on the cyclic shift information for reference signal; and
determining the PHICH resource based on the modifier according to Table 3
TABLE 3
cyclic shift information
for reference signal
modifier
000
0
001
1
010
2
011
3
100
4
101
5
110
6
111
7.
4. The method of claim 3 , wherein determining the PHICH resource comprises 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 three (3) bits long, and is received by DCI (Downlink Control Information) format 0.
7. A communication method performed by an e-Node B (eNB), the method comprising:
transmitting at the eNB, cyclic shift information for reference signal to a user equipment (UE);
receiving, at the eNB, data and a reference signal from the UE using one or more uplink radio resources; and
transmitting, at the eNB, Acknowledgement/Negative Acknowledgement (ACK/NACK) for the received 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 cyclic shift information for reference signal is mapped to the dynamic cyclic shift value based on Table 2, and
the PHICH resource is determined at least based on the cyclic shift information for reference signal
TABLE 2
cyclic shift information for
dynamic
reference signal
cyclic shift value
000
0
001
6
010
3
011
4
100
2
101
8
110
10
111
9.
8. The method of claim 7 , wherein a mapping according to Table 2 prevents collision of the PHICH resource downlink radio sources obtained based on a modulo-four operation.
9. The method of claim 7 , further comprising:
determining a modifier based on the cyclic shift information for reference signal; and
determining the PHICH resource based on the modifier according to Table 4
TABLE 4
cyclic shift information
for reference signal
modifier
000
0
001
1
010
2
011
3
100
4
101
5
110
6
111
7.
10. The method of claim 9 , wherein determining the PHICH resource comprises a modulo-four operation.
11. The method of claim 7 , wherein the reference signal is a Demodulation Reference signal (DMRS).
12. The method of claim 7 , wherein the cyclic shift information for reference signal is three (3) bits long, and is transmitted by DCI (Downlink Control Information) format 0.
13. A communication apparatus for a user equipment (UE), the apparatus comprising:
a memory; and
a processor coupled to the memory,
wherein the processor, when executing program instructions stored in the memory, is configured to:
cause the UE to receive cyclic shift information for reference signal;
determine a dynamic cyclic shift value based on the cyclic shift information for reference signal;
generate a reference signal by cyclically shifting a sequence at least based on the dynamic cyclic shift value;
cause the UE to transmit data and the reference signal using one or more uplink radio resources; and
cause the UE to receive Acknowledgement/Negative Acknowledgement (ACK/NACK) for the transmitted data using a Physical Hybrid ARQ Indicator Channel (PHICH) resource,
wherein the dynamic cyclic shift value is determined 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
dynamic cyclic shift
for reference signal
value
000
0
001
6
010
3
011
4
100
2
101
8
110
10
111
9.
14. The apparatus of claim 13 , wherein a mapping according to Table 5 prevents collision of the PHICH resource obtained based on a modulo-four operation.
15. The apparatus of claim 13 , wherein the processor is further configured to:
determine a modifier based on the cyclic shift information for reference signal; and
determine the PHICH resource based on the modifier according to Table 6
TABLE 6
cyclic shift information
for reference signal
modifier
000
0
001
1
010
2
011
3
100
4
101
5
110
6
111
7.
16. The apparatus of claim 15 , wherein determining the PHICH resource comprises 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 three (3) bits long, and is received by DCI (Downlink Control Information) format 0.
19. A communication apparatus for an e-Node B (eNB), the apparatus comprising:
a memory; and
a processor coupled to the memory,
wherein the processor, when executing program instructions stored in the memory, 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 from the UE using one or more uplink radio resources; and
cause the eNB to transmit Acknowledgement/Negative Acknowledgement (ACK/NACK) for the received 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 cyclic shift information for reference signal is mapped to the dynamic cyclic shift value based on Table 7, and
the PHICH resource is determined at least based on the cyclic shift information for reference signal
TABLE 7
cyclic shift information
dynamic cyclic shift
for reference signal
value
000
0
001
6
010
3
011
4
100
2
101
8
110
10
111
9.
20. The apparatus of claim 19 , wherein a mapping according to Table 7 prevents collision of the PHICH resource obtained based on a modulo-four operation.
21. The apparatus of claim 19 , the processor is further configured to:
determine a modifier based on the cyclic shift information for reference signal; and
determine PHICH resource based on the modifier according to Table 8
TABLE 8
cyclic shift information
for reference signal
modifier
000
0
001
1
010
2
011
3
100
4
101
5
110
6
111
7.
22. The apparatus of claim 21 , wherein determining the PHICH resource comprises a modulo-four operation.
23. The apparatus of claim 19 , wherein the reference signal is a Demodulation Reference signal (DMRS).
24. The apparatus of claim 19 , wherein the cyclic shift information for reference signal is three (3) bits long, and is transmitted by DCI (Downlink Control Information) format 0.
25. A communication apparatus, comprising:
a memory; and
a processor coupled to the memory,
wherein the processor, when executing program instructions stored in the memory, is configured to:
cause the apparatus to receive cyclic shift information for reference signal;
determine a dynamic cyclic shift value based on the cyclic shift information for reference signal;
generate a reference signal by cyclically shifting a sequence at least based on the dynamic cyclic shift value;
cause the apparatus to transmit data and the reference signal using one or more uplink radio resources; and
cause the apparatus to receive ACK/NACK (Acknowledgement/Negative Acknowledgement) for the transmitted data using a Physical Hybrid ARQ Indicator Channel (PHICH) resource,
wherein the dynamic cyclic shift value is determined based on the cyclic shift information for reference signal according to Table 9 and the PHICH resource is determined at least based on the cyclic shift information for reference signal
TABLE 9
cyclic shift information
dynamic cyclic shift
for reference signal
value
000
0
001
6
010
3
011
4
100
2
101
8
110
10
111
9.
26. The apparatus of claim 25 , wherein a mapping according to Table 9 prevents collision of the PHICH resource obtained based on a modulo-four operation.
27. The apparatus of claim 25 , wherein the processor is further configured to:
determine a modifier based on the cyclic shift information for reference signal; and
determine PHICH resource based on the modifier according to Table 10
TABLE 10
cyclic shift information
for reference signal
modifier
000
0
001
1
010
2
011
3
100
4
101
5
110
6
111
7.
28. The apparatus of claim 27 , wherein determining the PHICH resource comprises a modulo-four operation.
29. The apparatus of claim 25 , wherein the reference signal is a Demodulation Reference signal (DMRS).
30. The apparatus of claim 25 , wherein the cyclic shift information for reference signal is three (3) bits long, and is received by DCI (Downlink Control Information) format 0.