Redundancy Version Selection for Soft Bit Reliability Distribution
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Solution Overview
Problem
Current communication networks face performance degradation due to uneven distribution of soft bit reliability in code blocks during transport block transmission, leading to increased Block Error Rate (BLER) and reduced Signal to Interference plus Noise Ratio (SINR), especially in higher order modulations like QAM64.
Innovation Solution
A base station dynamically selects a redundancy version parameter based on reception quality and decoding performance to achieve a more even distribution of soft bit reliability across code blocks, optimizing the transport format and redundancy version parameter for each transmission to improve decoding probability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed redundancy version parameter is used for all transport blocks, then device complexity is reduced and operation is simplified, but decoding performance deteriorates due to uneven soft bit reliability distribution
Solution Approach 1:
The patent implements dynamic selection of redundancy version parameter based on transport block size. The base station determines the appropriate redundancy version (0, 1, 2, or 3) according to the specific transport block size being transmitted, rather than using a fixed value for all cases. This dynamic adaptation optimizes soft bit reliability distribution across code blocks for different transport block sizes, resolving the contradiction between operational simplicity and decoding performance.
2Productivity
If higher order modulation (QAM64) is used to increase data throughput, then productivity is improved, but reliability deteriorates due to increased sensitivity to channel conditions and uneven soft bit distribution
Solution Approach 1:
The patent changes the redundancy version parameter based on transport block size to optimize the distribution of soft bits across code blocks. For QAM64 modulation with specific transport block sizes, selecting the appropriate redundancy version (0, 1, 2, or 3) adjusts the soft bit reliability distribution, thereby improving decoding reliability while maintaining high data throughput. This parameter adaptation allows the system to achieve both high productivity and reliability.
3Productivity
If transport block size is increased to improve efficiency, then productivity is improved, but manufacturing precision deteriorates due to increased probability of errors and uneven soft bit reliability
Solution Approach 1:
The patent dynamically adjusts the redundancy version parameter according to transport block size. For larger transport blocks, the system selects redundancy versions that optimize soft bit distribution across the increased number of code blocks, maintaining transmission accuracy despite the larger size. This dynamic parameter selection ensures that transmission efficiency is improved while preserving transmission accuracy through adaptive optimization.
Data Source
AI summary
The embodiments herein relate to a method in a base station (101) for transmitting a transport block to a user equipment (105) in a communications network (100). The transport block comprises a plurality of bits. The base station (101) selects (203a, 203b, 401) a transport format. The base station (101) dynamically selects (204a, 203b, 402) a first redundancy version parameter based on a decoding performance for the transport block. The base station (101) transmits (205a, 204b, 404) the transport block comprising the plurality of bits distributed according to the dynamically selected first redundancy version parameter and according to the selected transport format in a first transmission to the user equipment (105).