Adaptive FEC Block Sizing for Single Encoder-Decoder Efficiency
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Solution Overview
Problem
Conventional wireless systems employ a fixed forward error correction (FEC) code scheme, which can lead to inefficient communication due to changes in wireless network characteristics and channel conditions, resulting in reduced performance for some user equipment (UEs) and limited flexibility in adapting to varying conditions.
Innovation Solution
The system dynamically selects and uses multiple FEC codes based on wireless system parameters, such as channel quality indicators (CQI), allowing for concurrent use of different FEC codes among UEs and adapting to changes in communication channels by adjusting information block lengths through padding or segmentation, enabling efficient error correction across varying conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed FEC code scheme is employed, then device complexity is reduced, but adaptability to varying channel conditions deteriorates
Solution Approach 1:
The patent implements dynamic FEC code selection where the system transitions from a static fixed code scheme to a dynamic adaptive scheme. The base station and user equipment continuously monitor channel conditions (CQI, RSRP, RSRQ) and adjust the FEC code selection in real-time, making the system flexible and responsive to varying wireless environments while maintaining manageable complexity through standardized procedures.
Solution Approach 2:
The patent changes the parameter of FEC code selection from a fixed value to a dynamically adjustable parameter based on channel conditions. By modifying parameters such as code rate, block length, and code type (e.g., LDPC, Polar, Turbo codes) according to measured channel quality, the system achieves adaptability without requiring completely new system architecture.
2Adaptability or versatility
If multiple FEC codes are used dynamically, then adaptability to channel conditions is improved, but device complexity increases
Solution Approach 1:
The patent segments the FEC code selection process into distinct components: channel measurement (CQI, RSRP, RSRQ), code selection based on segmented criteria, and separate encoding/decoding operations. This segmentation allows the system to handle multiple codes through modular, manageable steps rather than requiring complex unified processing.
Solution Approach 2:
The patent creates a universal FEC selection mechanism that can handle multiple code types (LDPC, Polar, Turbo) and multiple selection criteria (CQI thresholds, RSRP ranges, RSRQ levels) through a single standardized procedure. This multi-functional approach enables the system to adapt to various channel conditions using one unified selection framework rather than requiring separate mechanisms for each code type.
3Reliability
If information block lengths are adjusted through padding or segmentation, then error correction efficiency is improved, but processing time increases
Solution Approach 1:
The patent performs padding or segmentation of information blocks during the encoding phase at the base station before transmission. By preparing the information blocks in advance with appropriate lengths matching the selected FEC code requirements, the system avoids time-consuming operations at the receiving end, reducing overall processing time while maintaining error correction efficiency.
Data Source
AI summary
Various embodiments disclosed herein provide for a transmitter that can adjust the size of an information block or segment the information block based on a forward error correction (FEC) code optimum efficiency. Certain FEC codes are more efficient at encoding and decoding longer information blocks and if an information block is shorter than a predetermined length, the transmitter can pad the information block with a group of null bits to lengthen the information block to increase the performance of encoding and decoding the information block. In some embodiments, the transmitter can segment the information block into a set of segments, and if the last segment is below the predetermined length, the transmitter can pad the last segment.