Channel Coding Method for Contiguous Bit Sequence Mapping
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Solution Overview
Problem
In LTE systems, the aggregation of basic transmission time units for scheduling leads to unstable decoding performance due to discontinuous transmission of redundancy versions, which affects overall system performance.
Innovation Solution
A channel coding method that loads a cyclic redundancy check bit into a transport block, divides it into code blocks, performs channel coding on each block, and maps the resulting bit sequences to transmission resources in a way that ensures contiguous reading across basic transmission time units, using either cross-mapping or sequential mapping to improve stability and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TTI bundling is used to improve transmission quality and coverage, then the probability of successful data decoding is improved, but the decoding performance becomes unstable due to discontinuous transmission of redundancy versions
Solution Approach 1:
The transport block is divided into multiple code blocks, and each code block is separately channel coded to generate multiple bit sequences. These bit sequences are then mapped to different transmission resources in a segmented manner, allowing continuous reading across TTI boundaries while maintaining the benefits of TTI bundling for improved decoding probability.
Solution Approach 2:
The patent introduces dynamic mapping strategies where bit sequences from different code blocks can be flexibly mapped to transmission resources. This dynamic approach allows the system to adapt the mapping pattern to ensure contiguous reading of bit sequences across basic transmission time units, thereby stabilizing decoding performance while maintaining the reliability improvements from TTI bundling.
2Area of stationary object
If different redundancy versions are transmitted in consecutive TTI resources, then transmission coverage is extended, but data transmission is discontinuous which affects decoding stability
Solution Approach 1:
The transport block is segmented into multiple code blocks, and the bit sequences generated from these code blocks are separately mapped to different transmission resources. This segmentation allows the system to transmit redundancy versions across multiple TTIs while maintaining continuity in the bit sequence reading process, thus extending coverage area without sacrificing decoding stability.
Solution Approach 2:
The patent ensures continuous reading of bit sequences across basic transmission time units by carefully designing the mapping strategy. Even though different redundancy versions are transmitted in consecutive TTIs, the bit sequences are arranged to be contiguous, maintaining the continuity of useful action during decoding and thereby stabilizing decoding performance while extending coverage.
3Stability of the object's composition
If channel coding is performed on code blocks and bit sequences are mapped to transmission resources, then decoding stability is improved, but the system complexity increases
Solution Approach 1:
By dividing the transport block into multiple code blocks and processing them separately, the system achieves more stable decoding. The segmentation allows for manageable complexity in each code block processing while the overall system benefits from improved decoding stability through the combined effect of multiple coded blocks.
Solution Approach 2:
The patent employs parameter changes in the mapping strategy, where bit sequences are mapped to transmission resources based on adjustable parameters. This allows the system to optimize the mapping pattern to ensure contiguous reading while managing complexity through parameter-based control rather than complex fixed structures.
Data Source
AI summary
A method may include: dividing, by a sending device into k code blocks CBs, a TB into which a cyclic redundancy check bit is loaded, then separately performing channel coding on the k CBs, to obtain a bit sequence Sj, where j=1, 2, . . . , and k, and a set S={S1, S2, . . . , Sk}, and mapping, by the sending device, some or all bit sequences in all elements in S to transmission resources in N basic transmission time units, where some or all bit sequences in the Sj are mapped to transmission resources in Mj basic transmission time units, and a last bit in the Sj mapped to an mth basic transmission time unit in the Mj basic transmission time units and a first bit in the Sj mapped to an (m+1)th basic transmission time unit are contiguous in the Sj.