Method and apparatus for data transmission in wireless cellular communication system
A method and an apparatus for transmitting data in a wireless communication system are provided. A length of a circular buffer associated with rate matching is identified. Rate matching is performed for a code block based on the circular buffer. The data is transmitted based on the rate matching. In case that the rate matching is limited buffer rate matching (LBRM), the length of the circular buffer associated with the LBRM is determined based on a value obtained by dividing a reference transport block size (TBS) by a product of a number of code blocks and a reference code rate for the LBRM.
1. A method for transmitting data in a wireless communication system, the method comprising;
identifying a length of a circular buffer associated with rate matching;
performing the rate matching for a code block based on the circular buffer; and
transmitting the data based on the rate matching,
wherein in case that the rate matching is limited buffer rate matching (LBRM), the length of the circular buffer associated with the LBRM is determined based on a value obtained by dividing a reference transport block size (TBS) by a product of a number of code blocks and a reference code rate for the LBRM.
2. The method of claim 1 , further comprising:
identifying that the LBRM is configured via higher layer signaling.
3. The method of claim 1 , wherein the reference code rate is 2/3.
4. The method of claim 1 , wherein the length of the circular buffer, N cb , is determined as a following equation:
N
cb
=
min
(
⌊
TBS
ref
C
×
R
ref
⌋
,
K
w
)
,
where TBS ref is a value of the reference TBS, C is the number of the code blocks, R ref is the reference code rate, and K w is a number of bits encoded by low density parity check, LDPC, coding.
5. The method of claim 1 ,
wherein a value of the reference TBS is determined based on a value obtaining by multiplying a number of resource elements (REs) for the data, a code rate, a modulation order, and a number of layers, and
wherein the code rate and the modulation order are determined based on information included in downlink control information (DCI).
6. An apparatus in a wireless communication system, the apparatus comprising:
a transceiver; and
a controller operably coupled with the transceiver and configured to:
identify a length of a circular buffer associated with rate matching,
perform the rate matching for a code block based on the circular buffer, and
transmit the data based on the rate matching,
wherein in case that the rate matching is limited buffer rate matching (LBRM), the length of the circular buffer associated with the LBRM is determined based on a value obtained by dividing a reference transport block size (TBS) by a product of a number of code blocks and a reference code rate for the LBRM.
7. The apparatus of claim 6 , wherein the controller is further configured to:
identify that the LBRM is configured via higher layer signaling.
8. The apparatus of claim 6 , wherein the reference code rate is 2/3.
9. The apparatus of claim 6 , wherein the length of the circular buffer, N cb , is determined as a following equation:
N
cb
=
min
(
⌊
TBS
ref
C
×
R
ref
⌋
,
K
w
)
,
where TBS ref is a value of the reference TBS, C is the number of the code blocks, R ref is the reference code rate, and K w is a number of bits encoded by low density parity check, LDPC, coding.
10. The apparatus of claim 6 ,
wherein a value of the reference TBS is determined based on a value obtaining by multiplying a number of resource elements (REs) for the data, a code rate, a modulation order, and a number of layers, and
wherein the code rate and the modulation order are determined based on information included in downlink control information (DCI).