Dynamic CRC Bit Length for UCI Payload Rate Matching
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Solution Overview
Problem
Current cellular communication systems, such as LTE and NR, face inefficiencies in uplink transmission and reception, particularly in managing and decoding UCI payloads with varying CRC bit lengths, which affects the accuracy and efficiency of HARQ-ACK and CSI transmission.
Innovation Solution
The implementation of a terminal apparatus and base station apparatus that perform rate matching and decoding of UCI payloads using PUSCH, where the length of the output sequence EUCI is determined based on a first number of CRC bits LUCI, and additional CRC bits are added based on the payload size and output sequence length, enabling efficient transmission and reception of HARQ-ACK and CSI information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of CRC bits is fixed for all UCI payloads, then the processing is simple, but the transmission reliability varies for different payload sizes
Solution Approach 1:
The patent implements dynamic determination of CRC bit length based on UCI payload size and rate matching output sequence length. The base station and terminal adaptively select the number of CRC bits (e.g., 10, 11, 16, 22, or 30 bits) according to the specific transmission conditions, allowing the system to optimize reliability for each transmission while maintaining manageable processing complexity through standardized selection criteria.
2Measurement precision
If the number of CRC bits increases, then the error detection capability improves, but the overhead increases and efficiency decreases
Solution Approach 1:
The patent changes the parameter of CRC bit length dynamically based on transmission conditions. By selecting appropriate CRC bit lengths (10, 11, 16, 22, or 30 bits) according to payload size and rate matching output sequence length, the system achieves optimal error detection capability for each scenario while minimizing overhead. This parameter adaptation ensures that CRC bits are not excessively added when sufficient protection is already provided by the code rate.
3Adaptability or versatility
If dynamic rate matching is performed based on varying CRC bit lengths, then transmission adaptability improves, but the calculation complexity increases
Solution Approach 1:
The patent performs preliminary determination of the number of CRC bits before rate matching based on predefined criteria involving payload size and rate matching output sequence length. The base station and terminal both calculate the required CRC bit length in advance using standardized formulas, which simplifies the subsequent rate matching process. This preliminary action avoids complex real-time adjustments during transmission and ensures both ends use consistent parameters.
Data Source
AI summary
To enable efficient uplink transmission. A terminal apparatus includes: a coder configured to code a UCI payload and perform rate matching of coded bits of the UCI payload; and a transmitter configured to transmit the UCI payload by using a PUSCH, the UCI payload includes at least HARQ-ACK information and/or CSI, a length of an output sequence EUCI of the rate matching is provided based on a first number of CRC bits LUCI, the first number of CRC bits LUCI is provided based on a size of the payload, and a size of second CRC bits added to the payload is provided based on the size of the payload and the length of the output sequence EUCI of the rate matching.