Method and apparatus for transmitting control information in a wireless communication system
A wireless communication system is disclosed. Disclosed herein are methods for transmitting a physical uplink control channel (PUCCH) signal in a wireless communication system, which includes setting transmit power for the PUCCH signal, and an apparatus thereof. If the PUCCH signal is transmitted on a subframe configured for a scheduling request (SR), the PUCCH signal includes one or more hybrid automatic repeat request acknowledgement (HARQ-ACK) bits and an SR bit. When determining the transmit power for the PUCCH, the SR bit is selectively considered depending on whether or not a transport block for an uplink shared channel (UL-SCH) is present in the subframe.
1. A method for transmitting a physical uplink control channel (PUCCH) signal by a communication apparatus in a wireless communication system, the method comprising:
when a hybrid automatic repeat request acknowledgement (HARQ-ACK) transmission coincides with a subframe configured for a scheduling request (SR) transmission, generating the PUCCH signal including two or more HARQ-ACK bits and a SR bit for scheduling a SR; and
setting a transmit power for the PUCCH signal by using a value n SR ; and
transmitting the PUCCH signal using the transmit power,
wherein n SR is 1 when the SR does not have any associated transport block for an uplink shared channel (UL-SCH) at the subframe, and n SR is 0 when the SR has an associated transport block for the UL-SCH at the subframe.
2. The method according to claim 1 , wherein the transmit power for the PUCCH signal is set by using the following equation:
h
(
·
)
=
n
HARQ
+
n
SR
-
1
N
where n HARQ includes a number of one or more transport blocks received over two or more configured cells.
3. The method according to claim 2 , wherein n HARQ is a sum of the number of one or more transport blocks and a number, which is zero or greater, of semi-persistent scheduling (SPS) release physical downlink control channels (PDCCHs) received over the two or more configured cells.
4. The method according to claim 3 , wherein the transmit power for the PUCCH signal at subframe i is determined by using the following equation:
P
PUCCH
(
i
)
=
min
{
P
CMAX
,
c
(
i
)
,
P
0
_
PUCCH
+
PL
c
+
h
(
·
)
+
Δ
F
_
PUCCH
(
F
)
+
Δ
T
×
D
(
F
′
)
+
g
(
i
)
}
where P PUCCH (i) denotes a transmit power for the PUCCH, P CMAX,c (i) denotes a maximum transmit power configured for a serving cell c, P 0—PUCCH denotes a parameter configured by a higher layer, PL c denotes a downlink path loss estimation value of the serving cell c, Δ F—PUCCH (F) denotes a value corresponding to a PUCCH format, Δ TxD (F′) denotes a value configured by the higher layer or 0, and g(i) denotes a current PUCCH power control adjustment state.
5. The method according to claim 1 , wherein the SR bit is attached to an end of one or more of the HARQ-ACK bits.
6. The method according to claim 1 , wherein the SR bit is set to 1 in case of a positive SR, and the SR bit is set to 0 in case of a negative SR.
7. The method according to claim 1 , wherein the communication apparatus is configured with a simultaneous PUCCH-and-physical uplink shared channel (PUSCH) transmission mode.
8. The method according to claim 1 , wherein one or more of the HARQ-ACK bits and the SR bit are joint-coded.
9. A communication apparatus configured to transmit a physical uplink control channel (PUCCH) signal in a wireless communication system, the communication apparatus comprising:
a radio frequency (RF) unit; and
a processor configured to
generate, when a hybrid automatic repeat request acknowledgement (HARQ-ACK) transmission coincides with a subframe configured for a scheduling request (SR) transmission, the PUCCH signal including two or more HARQ-ACK bits and a SR bit for scheduling a SR,
set a transmit power for the PUCCH signal by using a value n SR , and
transmit the PUCCH signal using the transmit power,
wherein n SR is 1 when the SR does not have any associated transport block for an uplink shared channel (UL-SCH) at the subframe, and n SR is 0 when the SR has an associated transport block for the UL-SCH at the subframe.
10. The communication apparatus according to claim 9 , wherein the transmit power for the PUCCH signal is set by using the following equation:
h
(
·
)
=
n
HARQ
+
n
SR
-
1
N
where n HARQ includes a number of one or more transport blocks received over two or more configured cells.
11. The communication apparatus according to claim 10 , wherein n HARQ is a sum of the number of one or more transport blocks and a number, which is zero or greater, of semi-persistent scheduling (SPS) release physical downlink control channels (PDCCHs) received over the two or more configured cells.
12. The communication apparatus according to claim 11 , wherein the transmit power for the PUCCH signal at subframe i is determined by using the following equation:
P
PUCCH
(
i
)
=
min
{
P
CMAX
,
c
(
i
)
,
P
0
_
PUCCH
+
PL
c
+
h
(
·
)
+
Δ
F
_
PUCCH
(
F
)
+
Δ
T
×
D
(
F
′
)
+
g
(
i
)
}
where, P PUCCH (i) denotes a transmit power for the PUCCH, P CMAX,c (i) denotes a maximum transmit power configured for a serving cell c, P 0—PUCCH denotes a parameter configured by a higher layer, PL c denotes a downlink path loss estimation value of the serving cell c, Δ F—PUCCH (F) denotes a value corresponding to a PUCCH format, Δ TxD (F′) denotes a value configured by the higher layer or 0, and g(i) denotes a current PUCCH power control adjustment state.
13. The communication apparatus according to claim 9 , wherein the SR bit is attached to an end of one or more of the HARQ-ACK bits.
14. The communication apparatus according to claim 9 , wherein the SR bit is set to 1 in case of a positive SR, and the SR bit is set to 0 in case of a negative SR.
15. The communication apparatus according to claim 9 , wherein the communication apparatus is configured with a simultaneous PUCCH-and-physical uplink shared channel (PUSCH) transmission mode.
16. The communication apparatus according to claim 9 , wherein one or more of the HARQ-ACK bits and the SR bit are joint-coded.
17. The method according to claim 1 , wherein the transport block for an uplink shared channel (UL-SCH) includes a buffer status report (BSR).
18. The communication apparatus according to claim 9 , wherein the transport block for an uplink shared channel (UL-SCH) includes a buffer status report (BSR).