Method and apparatus for performing channel coding and decoding in communication or broadcasting system
The present disclosure relates to a communication scheme for convergence of an IoT technology and a 5G communication system for supporting a higher data transmission rate beyond a 4G system, 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, healthcare, digital education, retail businesses, security and security-related services, or the like) on the basis of a 5G communication technology and IoT-related technologies. The present invention provides a method for configuring a base graph of an LDPC code used for data channel transmission, and a method and an apparatus for segmentation of a transmission block by using an LDPC code.
1. A method by a terminal in a wireless communication system, the method comprising:
receiving, from a base station, downlink control information including modulation and coding scheme (MCS) information for scheduling data;
identifying a number of resource elements (REs) available for data transmission based on the downlink control information;
identifying a temporary transport block size (TBS) using the number of REs available for the data transmission, a number of layers, a coding rate and a modulation order indicated by the MCS information as parameters;
identifying a TBS based on the temporary TBS among TBS candidates included in a TBS candidate set; and
receiving, from the base station, a transport block of the data based on the identified TBS,
wherein the number of REs available for the data transmission used as a parameter for identifying the temporary TBS is identified by excluding a number of REs for a demodulation reference signal (DMRS) and a number of REs associated with a channel state information reference signal (CSI-RS) and a control channel.
2. The method of claim 1 , wherein the TBS is identified based on a quantized value of the temporary TBS, the quantized value of the temporary TBS corresponding to multiples of 8.
3. The method of claim 1 , wherein the number of REs available for the data transmission in one physical resource block (PRB) is identified as:
N SC RB ·N symb sh −N DMRS PRB −N oh PRB
where:
N SC RB =12 is the number of subcarriers in the one PRB,
N symb sh is a number of symbols allocated for the data transmission,
N DMRS PRB is the number of REs for the DMRS, and
N oh PRB is the number of REs associated with the CSI-RS and the control channel.
4. A method by a base station in a wireless communication system, the method comprising:
identifying modulation and coding scheme (MCS) information for transmitting data and resource information to be allocated to the data;
identifying a number of resource elements (REs) available for data transmission based on the resource information to be allocated to the data;
identifying a temporary transport block size (TBS) using the number of REs available for the data transmission, a number of layers, a coding rate and a modulation order indicated by the MCS information as parameters;
identifying a TBS based on the temporary TBS among TBS candidates included in a TBS candidate set; and
transmitting, to a terminal, a transport block of the data based on the identified TBS,
wherein the number of REs available for the data transmission used as a parameter for identifying the temporary TBS is identified by excluding a number of REs for a demodulation reference signal (DMRS) and a number of REs associated with a channel state information reference signal (CSI-RS) and a control channel.
5. The method of claim 4 , wherein the TBS is identified based on a quantized value of the temporary TBS, the quantized value of the temporary TBS corresponding to multiples of 8.
6. The method of claim 4 , wherein the number of REs available for the data transmission in one physical resource block (PRB) is identified as:
N SC RB ·N symb sh −N DMRS PRB −N oh PRB
where:
N SC RB =12 is the number of subcarriers in the one PRB,
N symb sh is a number of symbols allocated for the data transmission,
N DMRS PRB is the number of REs for the DMRS, and
N oh PRB is the number of REs associated with the CSI-RS and the control channel.
7. A terminal in a wireless communication system, the terminal comprising:
a transceiver; and
a processor configured to perform control to:
receive, from a base station, downlink control information including modulation and coding scheme (MCS) information for scheduling data,
identify a number of resource elements (REs) available for data transmission based on the downlink control information,
identify a temporary transport block size (TBS) using the number of REs available for the data transmission, a number of layers, a coding rate and a modulation order indicated by the MCS information as parameters,
identify a TBS based on the temporary TBS among TBS candidates included in a TBS candidate set, and
receive, from the base station, a transport block of the data based on the identified TBS,
wherein the number of REs available for the data transmission used as a parameter for identifying the temporary TBS is identified by excluding a number of REs for a demodulation reference signal (DMRS) and a number of REs associated with a channel state information reference signal (CSI-RS) and a control channel.
8. The terminal of claim 7 , wherein the TBS is identified based on a quantized value of the temporary TBS, the quantized value of the temporary TBS corresponding to multiples of 8.
9. The terminal of claim 7 , wherein the number of REs available for the data transmission in one physical resource block (PRB) is identified as:
N SC RB ·N symb sh −N DMRS PRB −N oh PRB
where:
N SC RB =12 is the number of subcarriers in the one PRB,
N symb sh is a number of symbols allocated for the data transmission,
N DMRS PRB is the number of REs for the DMRS, and
N oh PRB is the number of REs associated with the CSI-RS and the control channel.
10. A base station in a wireless communication system, the base station comprising:
a transceiver; and
a processor configured to perform control to:
identify modulation and coding scheme (MCS) information for transmitting data and resource information to be allocated to the data,
identify a number of resource elements (REs) available for data transmission based on the resource information to be allocated to the data,
identify a temporary transport block size (TBS) using the number of REs available for the data transmission, a number of layers, a coding rate and a modulation order indicated by the MCS information as parameters,
identify a TBS based on the temporary TBS among TBS candidates included in a TBS candidate set, and
transmit, to a terminal, a transport block of the data based on the identified TBS,
wherein the number of REs available for the data transmission used as a parameter for identifying the temporary TBS is identified by excluding a number of REs for a demodulation reference signal (DMRS) and a number of REs associated with a channel state information reference signal (CSI-RS) and a control channel.
11. The base station of claim 10 , wherein the TBS is identified based on a quantized value of the temporary TBS, the quantized value of the temporary TBS corresponding to multiples of 8.
12. The base station of claim 10 , wherein the number of REs available for the data transmission in one physical resource block (PRB) is identified as:
N SC RB ·N symb sh −N DMRS PRB −N oh PRB
where:
N SC RB =12 is the number of subcarriers in the one PRB,
N symb sh is a number of symbols allocated for the data transmission,
N DMRS PRB is the number of REs for the DMRS, and
N oh PRB is the number of REs associated with the CSI-RS and the control channel.