NR Transport Block Size and Redundancy Version Configuration
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Solution Overview
Problem
Current data transmission methods in new radio (NR) systems result in low spectral efficiency due to large granularity of redundancy versions (RVs) and excessive bit transmission during hybrid automatic repeat request (HARQ) retransmissions, leading to inefficient use of spectral resources.
Innovation Solution
The method involves configuring and refining transport block size (TBS) and RV information, including determining the sequence and start positions of RVs, to optimize transmission efficiency, allowing for flexible granularity and reduced overlapping bits, thereby improving spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a smaller equivalent transmission code rate is used to ensure correct decoding during initial transmission, then decoding reliability is improved, but spectral efficiency deteriorates due to larger quantity of transmitted redundant check bits
Solution Approach 1:
The patent segments the transport block into multiple code blocks, each with its own LDPC code and redundancy version. This allows selective transmission and combining of code blocks, reducing the total redundant bits needed while maintaining decoding reliability through incremental redundancy across retransmissions.
Solution Approach 2:
The patent dynamically adjusts the redundancy version and transport block size based on channel conditions and decoding status. The network device can selectively retransmit specific code blocks with appropriate redundancy versions, optimizing the balance between reliability and spectral efficiency adaptively.
2Reliability
If the distance between start positions of different RVs is increased to ensure correct decoding, then decoding reliability is improved, but spectral efficiency deteriorates due to larger minimum granularity of RV length
Solution Approach 1:
By segmenting the transport block into multiple code blocks with different LDPC codes, the patent enables finer granularity in redundancy version selection. Each code block can use optimized RV start positions, avoiding the need for large distances between RV positions while ensuring correct decoding through diverse code structures.
Solution Approach 2:
The patent changes the LDPC code parameters (mother code length, code rate, RV start positions) for different code blocks based on their specific requirements. This allows each code block to use optimal RV configurations, improving spectral efficiency while maintaining decoding reliability through parameter optimization.
3Reliability
If a larger quantity of bits is transmitted during HARQ retransmissions to ensure correct decoding, then decoding reliability is improved, but spectral efficiency deteriorates due to excessive bit transmission beyond minimum required
Solution Approach 1:
The patent extracts and retransmits only the specific code blocks that failed decoding, rather than retransmitting entire transport blocks or excessive redundant bits. This selective retransmission approach ensures decoding reliability for failed blocks while minimizing unnecessary bit transmission, thereby improving spectral efficiency.
Solution Approach 2:
The patent applies partial action by transmitting only the necessary portion of redundant bits required for successful decoding of specific code blocks. Instead of transmitting excessive bits uniformly, the system transmits precisely the amount needed for each code block based on its decoding status, optimizing spectral efficiency.
Data Source
AI summary
Embodiments of this application provide a data transmission method and a communication apparatus. The method includes: A network device sends first information to a terminal device, where the first information is used to indicate transport block size TBS configuration information and/or redundancy version RV configuration information, the TBS configuration information is used to configure a first transport block size TBS, and the RV configuration information is used to configure first RV information. The network device receives a transport block from the terminal device, or the network device sends a transport block to the terminal device, where a TBS of the transport block is the first TBS, and/or RV information of the transport block is the first RV information. The network device may expand a TBS and/or refine an RV by using the TBS configuration information and/or the RV configuration information, thereby improving a spectral efficiency when the TB is transmitted.