Method and apparatus for transmitting channel quality control information in wireless access system
A method and apparatus for transmitting or receiving channel quality control information through a physical uplink shared channel (PUSCH) in a wireless access system that supports hybrid automatic retransmit request (HARQ). In one embodiment, a user equipment (UE) receives a physical downlink control channel (PDCCH) signal including an initial uplink grant, transmits uplink data using two transport blocks based on the initial uplink grant, receives a negative acknowledgement (NACK) information for one of the two transport blocks, and transmits a channel quality control information along with the one of the two transport blocks which is retransmitted according to the NACK information or a new transport block through the PUSCH to which the HARQ is applied. A number of coded symbols required to transmit the channel quality control information (Q′) is calculated based on the initial uplink grant.
1. A method for transmitting channel quality control information through a physical uplink shared channel (PUSCH) in a wireless access system that supports hybrid automatic retransmit request (HARQ), the method performed by a user equipment (UE) and comprising:
receiving a physical downlink control channel (PDCCH) including an initial uplink grant;
transmitting first uplink data using two transport blocks based on the initial uplink grant through the PUSCH;
receiving a negative acknowledgement (NACK) information for one of the two transport blocks; and
transmitting second uplink data which is to be retransmitted in response to the NACK information and channel quality control information, by using two transport blocks through the PUSCH,
wherein a number of coded symbols, Q′, required to transmit the channel quality control information is calculated based on the initial uplink grant,
wherein the initial uplink grant includes information M sc PUSCH-initial(x) on the number of subcarriers for a transport block for transmitting the channel quality control information, information C (x) on a number of code blocks related to the transport block for transmitting the channel quality control information, and information K r (x) on the size of the code blocks, and
wherein ‘x’ denotes an index of the transport block for transmitting the channel quality control information.
2. The method according to claim 1 , wherein the number of coded symbols, Q′, is calculated by
min
(
⌈
(
O
+
L
)
·
M
sc
PUSCH
-
initial
(
x
)
·
N
symb
PUSCH
-
initial
(
x
)
·
β
offset
PUSCH
∑
r
=
0
C
(
x
)
-
1
K
r
(
x
)
⌉
,
M
sc
PUSCH
·
N
symb
PUSCH
-
Q
RI
(
x
)
Q
m
(
x
)
)
,
wherein N symb PUSCH-initial(x) represents a number of single carrier-frequency division multiple access (SC-FDMA) symbols for initial PUSCH transmission.
3. The method according to claim 2 , wherein the channel quality control information is transmitted in a transport block corresponding to a highest modulation and coding scheme index value indicated by the initial uplink grant.
4. The method according to claim 2 , further comprising:
receiving a PDCCH including a second uplink grant for scheduling one of the two transport blocks which is used for new transmission.
5. The method according to claim 2 , further comprising:
calculating information about the second uplink data retransmitted through the one of the two transport block,
wherein the information about the uplink data is calculated by G=N L (x) ·(N symb PUSCH ·M sc PUSCH ·Q m (x) −Q CQI −Q RI (x) ).
6. A user equipment (UE) for transmitting channel quality control information through a physical uplink shared channel (PUSCH) in a wireless access system that supports hybrid automatic retransmit request (HARQ), the UE comprising:
a receiver;
a transmitter; and
a processor configured to:
control the transmitter to transmit the channel quality control information;
control the receiver to receive a physical downlink control channel (PDCCH) including an initial uplink grant;
control the transmitter to transmit first uplink data using two transport blocks based on the initial uplink grant through the PUSCH;
control the receiver to receive a negative acknowledgement (NACK) information for one of the two transport blocks; and
control the transmitter to transmit a second uplink data which is to be retransmitted in response to the NACK information and channel quality control information, by using two transport blocks through the PUSCH,
wherein a number of coded symbols, Q′, required to transmit the channel quality control information is calculated based on the initial uplink grant,
wherein the initial uplink grant includes information M sc PUSCH-initial(x) on the number of subcarriers for a transport block for transmitting the channel quality control information, information C (x) on a number of code blocks related to the transport block for transmitting the channel quality control information, and information K r (x) on the size of the code blocks, and
wherein ‘x’ denotes an index of the transport block for transmitting the channel quality control information.
7. The UE according to claim 6 , wherein the number of coded symbols, Q′, is calculated by
min
(
⌈
(
O
+
L
)
·
M
sc
PUSCH
-
initial
(
x
)
·
N
symb
PUSCH
-
initial
(
x
)
·
β
offset
PUSCH
∑
r
=
0
C
(
x
)
-
1
K
r
(
x
)
⌉
,
M
sc
PUSCH
·
N
symb
PUSCH
-
Q
RI
(
x
)
Q
m
(
x
)
)
,
wherein N symb PUSCH-initial(x) represents a number of single carrier-frequency division multiple access (SC-FDMA) symbols for initial PUSCH transmission.
8. The UE according to claim 6 , wherein the channel quality control information is transmitted in a transport block corresponding to a highest modulation and coding scheme index value indicated by the initial uplink grant.
9. The UE according to claim 6 , the processor further configured to:
receive a PDCCH including a second uplink grant for scheduling one of the two transport blocks which is used for new transmission.
10. The UE according to claim 6 , wherein the processor is further configured to calculate information about the second uplink data retransmitted through the one of the two transport block,
wherein the information about the uplink data is calculated by G=N L (x) ·(N symb PUSCH ·M sc PUSCH ·Q m (x) −Q CQI −Q RI (x) ).
11. A method for receiving channel quality control information through a physical uplink shared channel (PUSCH) in a wireless access system that supports hybrid automatic retransmit request (HARQ), the method performed by a base station and comprising:
transmitting a physical downlink control channel (PDCCH) including an initial uplink grant;
receiving first uplink data using two transport blocks based on the initial uplink grant;
transmitting a negative acknowledgement (NACK) information for one of the two transport blocks; and
receiving second uplink data which is to be retransmitted in response to the NACK information and channel quality control information, by using two transport blocks through the PUSCH,
wherein a number of coded symbols, Q′, required to transmit the channel quality control information is calculated based on the initial uplink grant,
wherein the initial uplink grant includes information M sc PUSCH-initial(x) on the number of subcarriers for a transport block for transmitting the channel quality control information, information C (x) on a number of code blocks related to the transport block for transmitting the channel quality control information, and information K r (x) on the size of the code blocks, and
wherein ‘x’ denotes an index of the transport block for transmitting the channel quality control information.
12. The method according to claim 11 , wherein the number of coded symbols, Q′, is calculated by
min
(
⌈
(
O
+
L
)
·
M
sc
PUSCH
-
initial
(
x
)
·
N
symb
PUSCH
-
initial
(
x
)
·
β
offset
PUSCH
∑
r
=
0
C
(
x
)
-
1
K
r
(
x
)
⌉
,
M
sc
PUSCH
·
N
symb
PUSCH
-
Q
RI
(
x
)
Q
m
(
x
)
)
,
wherein N symb PUSCH-initial(x) represents a number of single carrier-frequency division multiple access (SC-FDMA) symbols for initial PUSCH transmission.
13. The method according to claim 12 , wherein the channel quality control information is received in a transport block corresponding to a highest modulation and coding scheme index value indicated by the initial uplink grant.
14. The method according to claim 12 , further comprising:
transmitting a PDCCH including a second uplink grant for scheduling one of the two transport blocks which is used for new transmission.
15. A base station for receiving channel quality control information through a physical uplink shared channel (PUSCH) in a wireless access system that supports hybrid automatic retransmit request (HARQ), the base station comprising:
a receiver;
a transmitter; and
a processor configured to:
control the receiver to receive the channel quality control information,
control the transmitter to transmit a physical downlink control channel (PDCCH) including an initial uplink grant;
control the receiver to receive uplink data using two transport blocks based on the initial uplink grant;
control the transmitter to transmit a negative acknowledgement (NACK) information for one of the two transport blocks; and
control the receiver to receive second uplink data which is to be retransmitted in response to the NACK information and channel quality control information, by using two transport blocks through the PUSCH,
wherein a number of coded symbols, Q′, required to transmit the channel quality control information is calculated based on the initial uplink grant,
wherein the initial uplink grant includes information M sc PUSCH-initial(x) on the number of subcarriers for a transport block for transmitting the channel quality control information, information C (x) on a number of code blocks related to the transport block for transmitting the channel quality control information, and information K r (x) on the size of the code blocks, and
wherein ‘x’ denotes an index of the transport block for transmitting the channel quality control information.
16. The base station according to claim 15 , wherein the number of coded symbols, Q′, is calculated by
min
(
⌈
(
O
+
L
)
·
M
sc
PUSCH
-
initial
(
x
)
·
N
symb
PUSCH
-
initial
(
x
)
·
β
offset
PUSCH
∑
r
=
0
C
(
x
)
-
1
K
r
(
x
)
⌉
,
M
sc
PUSCH
·
N
symb
PUSCH
-
Q
RI
(
x
)
Q
m
(
x
)
)
,
wherein N symb PUSCH-initial(x) represents a number of single carrier-frequency division multiple access (SC-FDMA) symbols for initial PUSCH transmission.
17. The base station according to claim 16 , wherein the channel quality control information is received in a transport block corresponding to a highest modulation and coding scheme index value indicated by the initial uplink grant.
18. The base station according to claim 16 , wherein the processor is further configured to:
control the transmitter to transmit a PDCCH including a second uplink grant for scheduling one of the two transport blocks which is used for new transmission.