Method and apparatus for data transmission in wireless cellular communication system
The present disclosure relates to a communication technique for convergence of a 5G communication system for supporting a higher data transmission rate beyond a 4G system with an IoT technology, and a system therefor. The present disclosure may be applied to intelligent services (for example, smart homes, smart buildings, smart cities, smart or connected cars, health care, digital education, retail business, security and safety-related services, etc.) on the basis of a 5G communication technology and an IoT-related technology. The present disclosure relates to a method and an apparatus for performing rate matching and configuring a soft buffer in a wireless cellular communication system.
1. A method performed by a terminal in a wireless communication system, the method comprising:
identifying that a limited buffer rate matching (LBRM) is configured;
generating encoded bits based on information bits;
performing rate matching on the encoded bits based on the LBRM; and
transmitting, to a base station, the rate-matched encoded bits,
wherein a size of a circular buffer for the rate matching is determined based on a reference transport block size (TBS) and a reference code rate for the LBRM.
2. The method of claim 1 , wherein the reference code rate is 2/3.
3. The method of claim 1 , wherein the size of the circular buffer, N cb , is determined based on
⌊
TBS
ref
C
*
R
ref
⌋
,
where TBS ref is a value of the reference TBS, C is a number of code blocks of the encoded bits, and R ref is the reference code rate.
4. The method of claim 3 , wherein the size of the circular buffer, N cb , is determined as a following equation:
N
cb
=
min
(
⌊
TBS
ref
C
*
R
ref
⌋
,
K
w
)
,
where K w is a number of bits of the encoded bits by low density parity check, LDPC, coding, and
wherein the rate matching is performed based on the size of the circular buffer.
5. The method of claim 1 ,
wherein the reference TBS is obtained based on at least one parameter for determining a maximum TBS.
6. The method of claim 1 ,
wherein the size of the circular buffer is determined based on a value obtained by a product of the reference TBS and 1/the reference code rate.
7. A method performed by a base station in a wireless communication system, the method comprising:
identifying that a limited buffer rate matching (LBRM) is configured;
generating encoded bits based on information bits;
performing rate matching on the encoded bits based on the LBRM; and
transmitting, to a terminal, the rate-matched encoded bits,
wherein a size of a circular buffer for the rate matching is determined based on a reference transport block size (TBS) and a reference code rate for the LBRM.
8. The method of claim 7 ,
wherein the reference TBS is obtained based on at least one parameter for determining a maximum TBS.
9. The method of claim 7 ,
wherein the size of the circular buffer is determined based on a value obtained by a product.
10. The method of claim 7 , wherein the size of the circular buffer, N cb , is determined based on
⌊
TBS
ref
C
*
R
ref
⌋
,
where TBS ref is a value of the reference TBS, C is a number of code blocks of the encoded bits, and R ref is the reference code rate, and
wherein the reference code rate is 2/3.
11. The method of claim 10 , wherein the size of the circular buffer, N cb , is determined as a following equation:
N
cb
=
min
(
⌊
TBS
ref
C
*
R
ref
⌋
,
K
w
)
,
where K w is a number of bits of the encoded bits by low density parity check, LDPC, coding, and
wherein the rate matching is performed based on the size of the circular buffer.
12. A base station transmitting a signal in a wireless communication system, the base station comprising:
a transceiver configured to transmit and receive a signal; and
a controller configured to:
identify that a limited buffer rate matching (LBRM) is configured;
generate encoded bits based on information bits,
perform rate matching on the encoded bits based on the LBRM, and
transmit, to a terminal, the rate-matched encoded bits,
wherein a size of a circular buffer for the rate matching is determined based on a reference transport block size (TBS) and a reference code rate for the LBRM.
13. The base station of claim 12 , wherein the reference code rate is 2/3.
14. The base station of claim 13 , wherein the size of the circular buffer, N cb , is determined based on
⌊
TBS
ref
C
*
R
ref
⌋
,
where TBS ref is a value of the reference TBS, C is a number of code blocks of the encoded bits, and R ref is the reference code rate.
15. The base station of claim 14 , wherein the size of the circular buffer, N cb , is determined as a following equation:
N
cb
=
min
(
⌊
TBS
ref
C
*
R
ref
⌋
,
K
w
)
,
where K w is a number of bits of the encoded bits by low density parity check, LDPC, coding, and
wherein the rate matching is performed based on the size of the circular buffer.
16. A terminal transmitting a signal in a wireless communication system, the terminal comprising:
a transceiver configured to transmit and receive a signal; and
a controller configured to:
identify that a limited buffer rate matching (LBRM) is configured,
generate encoded bits based on information bits,
perform rate matching on the encoded bits based on the LBRM, and
transmit, to a base station, the rate-matched encoded bits,
wherein a size of a circular buffer for the rate matching is determined based on a reference transport block size (TBS) and a reference code rate for the LBRM.
17. The terminal of claim 16 , wherein the reference code rate is 2/3.
18. The terminal of claim 16 , wherein the size of the circular buffer, N cb , is determined based on
⌊
TBS
ref
C
*
R
ref
⌋
,
where TBS ref is a value of the reference TBS, C is a number of code blocks of the encoded bits, and R ref is the reference code rate.
19. The terminal of claim 18 , wherein the size of the circular buffer, N cb , is determined as a following equation:
N
cb
=
min
(
⌊
TBS
ref
C
*
R
ref
⌋
,
K
w
)
,
where K w is a number of bits of the encoded bits by low density parity check, LDPC, coding, and
wherein the rate matching is performed based on the size of the circular buffer.