Time-Frequency Interleaving for URLLC Interference Mitigation
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Solution Overview
Problem
In wireless communications networks, Ultra-Reliable Low-Latency Communications (URLLC) transmissions often interfere with Enhanced Mobile Broadband (eMBB) transmissions, causing decoding issues due to strong interference in specific time and frequency resources.
Innovation Solution
The implementation of a codeword-to-resource element mapping scheme that interleaves data in both time and frequency domains using two-dimensional interleavers, spreading adjacent codeword modulation symbols across different OFDM symbols and subcarriers to minimize interference, while also accounting for unavailable resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If URLLC transmission is performed during eMBB transmission, then URLLC low-latency requirement is met, but eMBB transmission quality deteriorates due to strong interference
Solution Approach 1:
The patent applies two-dimensional interleaving that spreads adjacent codeword modulation symbols across both time domain (different OFDM symbols) and frequency domain (different subcarriers). This dimensional spreading ensures that when URLLC transmissions cause interference in specific time-frequency resources, the interfered symbols are scattered rather than concentrated, allowing the eMBB receiver to successfully decode data by combining information from multiple dimensions.
2Productivity
If data is transmitted in consecutive time-frequency resources, then transmission efficiency is improved, but interference from URLLC affects consecutive modulation symbols causing decoding failure
Solution Approach 1:
The patent segments consecutive modulation symbols by applying interleaving that distributes them across non-contiguous time-frequency resources. Specifically, the two-dimensional interleaver separates adjacent symbols in both time and frequency dimensions, so that interference from URLLC transmissions affects only isolated symbols rather than consecutive sequences, thereby maintaining decoding success rate while preserving transmission efficiency.
3Reliability
If interleaving spreads data across time and frequency resources, then interference mitigation is improved, but processing complexity increases
Solution Approach 1:
The patent implements two-dimensional interleaving that operates across both time and frequency domains simultaneously. This approach provides superior interference mitigation compared to one-dimensional interleaving because it spreads symbols in multiple dimensions, ensuring that URLLC interference affects only isolated symbols. The processing complexity increase is justified by the significant improvement in decoding reliability under interference conditions.
Data Source
AI summary
Apparatuses, methods, and systems for interleaving sequential data in time and frequency domains are disclosed. One apparatus includes a processor that interleaves sequential data in time and frequency domains. The sequential data includes a first data occupying a first time-frequency resource and a second data occupying a second time-frequency resource, the second data sequentially follows the first data prior to interleaving, and the first data is separated from the second data by at least one time resource and at least one frequency resource after interleaving.