LTE Bit Interleaving Layout for Time-Domain Burst Error Robustness
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Solution Overview
Problem
The Long Term Evolution (LTE) mobile communication system lacks a detailed interleaving operation, which is necessary for increasing reception reliability and robustness against burst errors in wireless transmission, particularly when channel environments experience abrupt changes.
Innovation Solution
The implementation of a time-first-mapping interleaving method, where coded bits are written into an interleaver on a row-by-row basis and read on a column-by-column basis, and vice versa for deinterleaving, to ensure robustness against time-domain burst errors and prevent code block loss during poor channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no interleaving operation is performed, then the system complexity is low, but the reception reliability deteriorates during abrupt channel changes
Solution Approach 1:
The patent segments the transmitted data into multiple code blocks and applies interleaving operations to distribute them across different time-frequency resources. This segmentation allows the system to handle abrupt channel changes more effectively by ensuring that not all code blocks are affected simultaneously, thereby improving reception reliability without requiring complete retransmission.
Solution Approach 2:
The patent introduces time-domain interleaving as an additional dimension for data distribution. By mapping code blocks across both frequency and time dimensions, the system creates a more robust transmission structure that can withstand abrupt channel changes. This dimensional approach spreads data vulnerability across multiple dimensions rather than concentrating it in a single resource allocation.
2Reliability
If interleaving is implemented to protect against burst errors, then the reliability improves, but the processing complexity increases
Solution Approach 1:
The patent applies interleaving operations during the data transmission preparation phase, before the actual transmission occurs. By pre-distributing code blocks across time-frequency resources and performing preliminary error correction encoding, the system reduces the burden on real-time processing during transmission, thereby managing complexity while maintaining robustness against burst errors.
Solution Approach 2:
The patent replaces complex mechanical interleaving mechanisms with algorithmic and mathematical approaches. By using systematic encoding schemes and mathematical transformations for interleaving and deinterleaving operations, the system achieves burst error protection through computational methods rather than complex physical or mechanical systems, thereby reducing overall processing complexity.
3Reliability
If code blocks are transmitted without interleaving, then the transmission process is simple, but complete code block loss occurs during poor channel conditions
Solution Approach 1:
The patent changes the temporal and frequency parameters of code block transmission through interleaving. By systematically varying the time and frequency positions of transmitted code blocks, the system ensures that abrupt channel changes affecting one time-frequency resource do not simultaneously affect all code blocks. This parameter variation approach enables code block recovery even under poor channel conditions while managing complexity through structured parameter changes.
Data Source
AI summary
An interleaving method to which time-first-mapping is applied in a mobile communication system is provided. The interleaving method includes writing coded bits into an interleaver on a row-by-row basis, and reading the coded bits written in the interleaver on a column-by-column basis, wherein the coded bits are written by groups having a size according to a modulation order.