Subcoded Multi-RAT Communication for Heterogeneous SINR Blocks
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Solution Overview
Problem
In mobile communication systems, interference from neighboring radio cells reduces the Signal to Interference plus Noise Ratio (SINR) on resource blocks, which existing channel codes struggle to effectively mitigate, particularly in heterogeneous radio environments like 5G networks.
Innovation Solution
The implementation of Multi-Edge LDPC coding techniques, which involve optimizing sub-codes for distinct SINR levels across resource blocks, using a Multi-Edge LDPC code framework that allocates suitable sub-codes based on channel gain profiles to minimize interference, and employing a joint decoding scheme across multiple radio access technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single channel code is used for all resource blocks, then device complexity is reduced, but coding gain is insufficient for heterogeneous SINR levels
Solution Approach 1:
The patent segments the single channel code into multiple subcodes (first subcode and second subcode) with different code rates. The first subcode is applied to resource blocks with higher SINR levels while the second subcode is applied to resource blocks with lower SINR levels. This segmentation allows each subcode to be optimized for its specific SINR range, improving overall coding gain while maintaining manageable complexity through structured code division.
Solution Approach 2:
The patent applies different code rates locally to different resource blocks based on their SINR characteristics. Resource blocks experiencing higher SINR use a first code rate (e.g., R1=1/2) while resource blocks experiencing lower SINR use a second code rate (e.g., R2=3/4). This local quality adaptation ensures that each resource block receives the appropriate level of error protection tailored to its channel conditions, maximizing reliability without uniformly increasing complexity across all resources.
2Reliability
If interference mitigation is strengthened through code optimization, then reliability improves, but the system adaptability to heterogeneous radio environments becomes more complex
Solution Approach 1:
The patent introduces dynamic adaptation by selecting different subcodes based on measured SINR levels of resource blocks. The system dynamically determines which resource blocks experience interference from neighboring cells and applies the appropriate subcode (first or second) accordingly. This dynamic approach enables the system to adapt to heterogeneous radio environments with varying interference conditions, improving reliability while maintaining reasonable adaptability complexity through rule-based selection.
Solution Approach 2:
The patent changes the code rate parameter based on SINR conditions. When SINR is above a threshold, the first code rate is used; when SINR is below the threshold, the second code rate is used. This parameter change strategy allows the system to respond to varying interference levels by adjusting the error protection level, thereby improving interference mitigation capability while adapting to heterogeneous environments through simple threshold-based parameter selection.
3Productivity
If code rate is increased to improve throughput, then productivity increases, but error protection capability deteriorates
Solution Approach 1:
The patent employs variable code rate parameters (R1 and R2) that are selected based on SINR conditions. For resource blocks with higher SINR, a lower code rate (e.g., R1=1/2) is used to provide stronger error protection. For resource blocks with lower SINR, a higher code rate (e.g., R2=3/4) is used to maximize throughput when the channel conditions permit. This parameter adaptation resolves the contradiction by allowing the system to optimize the trade-off between throughput and error protection locally for each resource block.
Data Source
AI summary
The disclosure relates to a mobile communication system including: a first transmission path configured to transmit a message according to a first radio access technology; a second transmission path configured to transmit the message according to a second radio access technology; and an encoder configured to encode the message by a code before transmission of the message over the first transmission path and the second transmission path, wherein the code comprises at least two subcodes, and wherein the encoder is configured to encode the message intended for transmission over the first transmission path with a first subcode of the at least two subcodes and to encode the message intended for transmission over the second transmission path with a second subcode of the at least two subcodes.