Method for transmitting control information and device for same
The present invention relates to a wireless communication system. In more detail, the present invention relates to a method for transmitting uplink control information in a wireless communication system operating as TDD, and a device for same. The method includes transmitting Hybrid Automatic Repeat request-Acknowledgement (HARQ) in a subframe n through Physical Uplink Control Channel (PUCCH), and a transmission power of the PUCCH relates to a method determined using Equation 4 or 5, and a device for same.
1. A method for transmitting uplink control information by a user equipment in a TDD (Time Division Duplex) wireless communication system, the method comprising:
determining, by the user equipment, a PUCCH (Physical Uplink Control Channel) transmission power parameter according to an UL-DL (Uplink-Downlink) configuration and a modulo equation; and
transmitting, by the user equipment to a base station, a HARQ-ACK (Hybrid Automatic Repeat reQuest-Acknowledgement) signal via a PUCCH in an uplink (UL) subframe in accordance with the determined PUCCH transmission power parameter,
wherein the modulo equation includes the following parameters;
a number of cells configured for the user equipment;
a downlink assignment index number indicated by a downlink scheduling-related PDCCH (Physical Downlink Control Channel) lastly detected within subframe(s) associated with the UL subframe;
a total number of downlink scheduling-related PDCCHs detected;
a number of HARQ-ACK bits corresponding to a configured downlink transmission mode on a serving cell c, and
one of:
a number of PDCCH or PDSCH (Physical Downlink Shared Channel) without a corresponding PDCCH received when bundling is applied, or
a number of transport blocks or a SPS (Semi-Persistent Scheduling) release PDCCH received by the user equipment when bundling is not applied,
wherein the modulo equation further includes applying a modulo-4 operation to a difference between the downlink assignment index number and the total number of downlink scheduling-related PDCCHs detected.
2. The method of claim 1 ,
wherein the UL subframe corresponds to a subframe n,
wherein the PUCCH transmission power parameter is n HARQ ,
wherein the modulo equation is:
n
HARQ
=
∑
c
=
0
C
-
1
(
(
(
V
DAI
,
c
DL
-
U
DAI
,
c
)
mod
4
)
·
n
c
ACK
+
∑
k
∈
K
N
k
,
c
received
)
,
wherein C denotes the number of cells configured for the user equipment,
K denotes a set having M elements k (k∈K) according to the UL-DL configuration, M is a positive integer,
V DAI,c DL is the downlink assignment index number having a value indicated by a 2-bit DAI (Downlihk Assignment Index) field included in the downlink scheduling-related PDCCH lastly detected within the subframe(s) n−k in the serving cell c,
U DAI,c denotes the total number of downlink scheduling-related PDCCHs detected within the subframe(s) n−k in the serving cell c,
n c ACK denotes the number of HARQ-ACK bits corresponding to the configured downlink transmission mode on the serving cell c, and is set to 1 when spatial bundling is applied,
when spatial bundling is applied, N k,c received represents the number of PDCCH or PDSCH without a corresponding PDCCH received in the subframe(s) n−k and the serving cell c,
when spatial bundling is not applied, N k,c received represents the number of transport blocks received or SPS release PDCCH received in the subframe(s) n−k and the serving cell c, and
mod represents a modulo operation.
3. The method according to claim 2 , wherein a PUCCH transmission power is determined according to the following equation:
h
(
·
)
=
n
HARQ
+
n
SR
-
1
N
,
wherein N is a positive integer, and
n SR is a power adjustment parameter used to adjust the PUCCH transmission power in relation to SR (Scheduling Request), and is set to 0 or 1.
4. The method according to claim 3 , wherein the PUCCH transmission power is determined according to the following equation:
P
PUCCH
(
n
)
=
min
{
P
CMAX
,
c
(
n
)
,
P
0
_PUCCH
+
PL
c
+
h
(
·
)
+
Δ
F_PUCCH
(
F
)
+
Δ
TxD
(
F
′
)
+
g
(
i
)
}
,
wherein P PUCCH (n) represents the PUCCH transmission power,
P CMAX,c (n) represents a configured transmission power in the subframe n for the serving cell c,
P 0 _ PUCCH is determined based on at least one parameter provided by a higher layer,
PL c is a downlink path loss estimate of the serving cell c,
Δ P _ PUCCH (F) represents a value corresponding to a PUCCH format,
Δ TxD (F′) is a value provided by the higher layer or 0, and
g(i) represents a current PUCCH power control adjustment state.
5. The method according to claim 1 , wherein the UL-DL configuration is one of UL-DL configurations #1 to #6 as shown in the following table
Uplink-downlink
Subframe number
configuration
0
1
2
3
4
5
6
7
8
9
0
D
S
U
U
U
D
S
U
U
U
1
D
S
U
U
D
D
S
U
U
D
2
D
S
U
D
D
D
S
U
D
D
3
D
S
U
U
U
D
D
D
D
D
4
D
S
U
U
D
D
D
D
D
D
5
D
S
U
D
D
D
D
D
D
D
6
D
S
U
U
U
D
S
U
U
D
wherein D denotes a subframe for downlink, S denotes a subframe comprising a downlink period, a guard period, and an uplink period, and U denotes a subframe for uplink.
6. The method according to claim 5 , wherein the UL-DL configuration is UL-DL configuration #5.
7. A user equipment configured to transmit uplink control information in a TDD (Time Division Duplex) wireless communication system, the user equipment comprising:
a processor configured to determine a PUCCH (Physical Uplink Control Channel) transmission power parameter according to an UL-DL (Uplink-Downlink) configuration and a modulo equation,
wherein the modulo equation includes the following parameters:
a number of cells configured for the user equipment;
a downlink assignment index number indicated by a downlink scheduling-related PDCCH (Physical Downlink Control Channel) lastly detected within subframe(s) associated with an UL (Uplink) subframe;
a total number of downlink scheduling-related PDCCHs detected;
a number of HARQ-ACK (Hybrid Automatic Repeat reQuest-Acknowledgement) bits corresponding to a configured downlink transmission mode on a serving cell c, and
one of:
a number of PDCCH or PDSCH (Physical Downlink Shared Channel) without a corresponding PDCCH received when bundling is applied, or
a number of transport blocks or a SPS (Semi-Persistent Scheduling) release PDCCH received by the user equipment when bundling is not applied,
wherein the modulo equation further includes applying a modulo-4 operation to a difference between the downlink assignment index number and the total number of downlink scheduling-related PDCCHs detected; and
a radio frequency (RF) unit operatively connected to the processor and configured to transmit a HARQ-ACK signal to a base station via a PUCCH in the UL subframe in accordance with the determined PUCCH transmission power parameter.
8. The user equipment of claim 7 ,
wherein the UL subframe corresponds to a subframe n,
wherein the PUCCH transmission power parameter is n HARQ ,
wherein the modulo equation is:
n
HARQ
=
∑
c
=
0
C
-
1
(
(
(
V
DAI
,
c
DL
-
U
DAI
,
c
)
mod
4
)
·
n
c
ACK
+
∑
k
∈
K
N
k
,
c
received
)
,
wherein C denotes the number of cells configured for the user equipment,
K denotes a set having M elements k (k∈K) according to the UL-DL configuration, M is a positive integer,
V DAI,c DL is the downlink assignment index number having a value indicated by a 2-bit DAI (Downlink Assignment Index) field included in the downlink scheduling-related PDCCH lastly detected within the subframe(s) n−k in the serving cell c,
U DAI,c denotes the total number of downlink scheduling-related PDCCHs detected within the subframe(s) n−k in the serving cell c,
n c ACK denotes the number of HARQ-ACK bits corresponding to the configured downlink transmission mode on the serving cell c, and is set to 1 when spatial bundling is applied,
when spatial bundling is applied, N k,c received represents the number of PDCCH or PDSCH without a corresponding PDCCH received in the subframe(s) n−k and the serving cell c,
when spatial bundling is not applied, N k,c received represents the number of transport blocks received or SPS release PDCCH received in the subframe(s) n−k and the serving cell c, and
mod represents a modulo operation.
9. The user equipment according to claim 8 , wherein the PUCCH transmission power is determined according to the following equation:
h
(
·
)
=
n
HARQ
+
n
SR
-
1
N
,
wherein N is a positive integer, and
n SR is a power adjustment parameter used to adjust the PUCCH transmission power in relation to SR (Scheduling Request), and is set to 0 or 1.
10. The user equipment according to claim 9 , wherein the PUCCH transmission power is determined according to the following equation:
P
PUCCH
(
n
)
=
min
{
P
CMAX
,
c
(
n
)
,
P
0
_PUCCH
+
PL
c
+
h
(
·
)
+
Δ
F_PUCCH
(
F
)
+
Δ
TxD
(
F
′
)
+
g
(
i
)
}
,
wherein P PUCCH (n) represents the PUCCH transmission power,
P CMAX,c (n) represents a configured transmission power in the subframe n for the serving cell c,
P 0 _ PUCCH is determined based on at least one parameter provided by a higher layer,
PL c is a downlink path loss estimate of the serving cell c,
Δ F _ PUCCH (F) represents a value corresponding to a PUCCH format,
Δ TxD (F′) is a value provided by the higher layer or 0, and
g(i) represents a current PUCCH power control adjustment state.
11. The user equipment according to claim 7 , wherein the UL-DL configuration is one of UL-DL configurations #1 to #6 as shown in the following table
Uplink-downlink
Subframe number
configuration
0
1
2
3
4
5
6
7
8
9
0
D
S
U
U
U
D
S
U
U
U
1
D
S
U
U
D
D
S
U
U
D
2
D
S
U
D
D
D
S
U
D
D
3
D
S
U
U
U
D
D
D
D
D
4
D
S
U
U
D
D
D
D
D
D
5
D
S
U
D
D
D
D
D
D
D
6
D
S
U
U
U
D
S
U
U
D
wherein D denotes a subframe for downlink, S denotes a subframe comprising a downlink period, a guard period, and an uplink period, and U denotes a subframe for uplink.
12. The user equipment according to claim 11 , wherein the UL-DL configuration is UL-DL configuration #5.