Tone-Level Interleaving for Multicast Frequency Diversity
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Solution Overview
Problem
Wireless communication systems, particularly those using physical multicast channels, experience reduced performance due to limited frequency diversity caused by long symbol durations, long cyclic prefixes, and large transport block sizes, leading to localized code blocks within a subset of tones, which results in reduced channel performance.
Innovation Solution
Implementing tone-level or resource element (RE)-level interleaving within or across code blocks to increase frequency diversity, using methods such as row-column interleaving, inter-code block interleaving, and intra-code block interleaving to spread code blocks across the system bandwidth, thereby improving channel performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If code blocks are localized within a subset of tones for long symbol duration and long cyclic prefix configurations, then transmission reliability is improved through concentrated resource allocation, but frequency diversity is reduced leading to degraded channel performance
Solution Approach 1:
The patent segments code blocks into multiple groups and distributes them across different tone subsets through interleaving. Instead of concentrating all code blocks within a single subset of tones, the system divides and spreads them across multiple tone groups, thereby achieving both reliable transmission through structured allocation and frequency diversity through distributed placement.
Solution Approach 2:
The patent introduces an additional dimension of distribution by mapping code blocks across both time and frequency domains simultaneously. Through interleaving patterns that span multiple symbols and tone groups, the system transforms the single-dimensional concentration problem into a multi-dimensional distribution solution, achieving frequency diversity while maintaining transmission reliability.
2Productivity
If code blocks are localized within a subset of tones for large transport block size configurations, then data throughput is improved through efficient resource utilization, but frequency diversity is reduced leading to degraded channel performance
Solution Approach 1:
For large transport block sizes, the patent segments the large data payload into multiple code block groups and distributes them across different tone subsets. This segmentation allows efficient utilization of available resources for high throughput while simultaneously achieving frequency diversity through the distributed arrangement of code blocks across multiple frequency regions.
Solution Approach 2:
The patent applies local quality by assigning different code block groups to different tone subsets with specific interleaving patterns. Each local region (tone subset) receives appropriately distributed code blocks, ensuring that local resource efficiency is maintained while global frequency diversity is achieved through the overall distribution pattern.
3Adaptability or versatility
If tone-level interleaving is implemented to increase frequency diversity, then channel performance is improved through better distribution, but device complexity increases due to additional processing requirements
Solution Approach 1:
The patent employs periodic interleaving patterns where code blocks are distributed in regular, repeating sequences across tone subsets. This periodic structure simplifies the implementation complexity by providing a predictable, rule-based interleaving mechanism that can be efficiently executed with minimal processing overhead while still achieving frequency diversity.
Solution Approach 2:
The patent achieves frequency diversity by changing the mapping parameters between code blocks and tone subsets through interleaving factors and patterns. By adjusting these parameters rather than fundamentally altering the transmission structure, the system achieves diversity gains with minimal increase in processing complexity, as the same basic framework can accommodate different interleaving configurations.
Data Source
AI summary
A base station maps code blocks of a transport block of a transport block size (TBS) for a channel using tone-level interleaving or resource element (RE)-level interleaving. Then, the base station can transmit the code blocks of the transport block of the TBS for the channel. A UE may receive the channel from the base station and de-interleave the received tones of the channel in a frequency domain to obtain the code blocks of the transport block having the TBS for the channel.