PUSCH Bit Mapping Based on CSS Search Space and DCI Format
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Solution Overview
Problem
Current radio communication systems, particularly in LTE, lack a concrete method for reducing processing time within the Transmission Time Interval (TTI), which affects communication efficiency.
Innovation Solution
The implementation of a terminal and base station apparatus that detects DCI formats, divides transport blocks into code blocks, codes them, and transmits these on a PUSCH, with multiplexed bits mapped to a matrix in a prioritized manner based on whether the search space is CSS, enabling efficient communication by optimizing data transmission and reception processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transport block is divided into multiple code blocks and coded separately, then the coding flexibility and error correction capability are improved, but the processing time and complexity increase
Solution Approach 1:
The transport block is divided into multiple code blocks for parallel processing. Each code block is independently coded and then multiplexed, allowing simultaneous processing of multiple blocks which reduces overall processing time while maintaining error correction capability through distributed coding across segments.
Solution Approach 2:
The patent introduces a two-dimensional mapping structure where coded bits from multiple code blocks are arranged in a matrix with rows and columns. This dimensional transformation enables efficient parallel processing and multiplexing operations, reducing processing time while preserving the reliability benefits of code block segmentation.
2Productivity
If the multiplexed bits are mapped to matrix in first-axis prioritized manner, then the processing speed and transmission efficiency are improved, but the decoding complexity at receiver increases
Solution Approach 1:
The patent employs feedback mechanisms where the mapping pattern information (first-axis or second-axis prioritization) is signaled to the receiver. This feedback enables the receiver to correctly interpret the multiplexed bit structure without requiring complex blind detection, thus maintaining transmission efficiency while managing decoding complexity through informed processing.
Solution Approach 2:
The system dynamically changes the mapping parameter (axis prioritization) based on channel conditions and traffic requirements. By switching between first-axis and second-axis prioritized mapping, the system optimizes transmission efficiency for different scenarios while the receiver uses the signaled parameter to adjust its decoding complexity accordingly.
3Reliability
If the search space is configured as CSS (Common Search Space), then the communication reliability and control channel robustness are improved, but the processing overhead and resource consumption increase
Solution Approach 1:
The CSS configuration serves multiple functions simultaneously: it provides robust control channel transmission, enables common scheduling information dissemination to multiple UEs, and supports both first-axis and second-axis mapping strategies. This multi-functionality reduces overall processing overhead by consolidating control functions in a single robust structure rather than requiring separate mechanisms for each function.
Data Source
AI summary
A terminal apparatus includes: a receiver configured to detect a DCI format in a search space; a coding unit configured to divide a transport block into one or multiple code blocks, based at least on the DCI format and code the one or multiple code blocks to generate coded bits; and a transmitter configured to transmit the coded bits on a PUSCH. Multiplexed bits are given based at least on concatenation of the coded bits generated by coding the one or multiple code blocks. The coding unit maps the multiplexed bits to a matrix in a first-axis prioritized manner and reads out the multiplexed bits mapped to the matrix in the first-axis prioritized manner or a second-axis prioritized manner. Whether to prioritize the first axis or the second axis in a case of reading out the multiplexed bits mapped to the matrix, is based at least on whether or not the search space is CSS.