Signal Space Diversity Interleaving for URLLC Collision Handling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in efficiently supporting both high-capacity and low-latency transmissions simultaneously, particularly in 5G networks, where conflicts between different types of transmissions can negatively impact existing data, leading to suboptimal resource utilization and increased latency.
Innovation Solution
The implementation of Signal Space Diversity (SSD) with interleaving techniques for QAM modulation, where the I and Q components of a signal are rotated and interleaved to create a gap between them, allowing only one component to be affected by urgent URLLC transmissions, thereby ensuring the eMBB transmission can still be decoded accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If eMBB transmissions use long scheduling time to minimise overhead and support high capacity, then data throughput is improved, but latency increases making it difficult to accommodate urgent URLLC transmissions
Solution Approach 1:
The patent segments the QAM modulation signal into separate I and Q components, applying different interleaving strategies to each component. This segmentation allows the system to maintain long scheduling times for eMBB while creating protected regions that can accommodate urgent URLLC transmissions without complete data loss
Solution Approach 2:
The patent applies preliminary interleaving to the I and Q components before transmission, arranging them in a pattern that anticipates potential URLLC interruptions. By pre-positioning components with gaps between corresponding elements, the system prepares the signal structure to withstand urgent transmissions while preserving decodable information
2Loss of time
If URLLC transmissions are prioritized to meet low latency requirements, then latency is reduced, but eMBB data may be completely corrupted by the urgent transmission
Solution Approach 1:
The patent converts the harmful effect of URLLC transmissions corrupting eMBB data into a beneficial outcome by using SSD interleaving. The interleaving pattern ensures that when URLLC transmissions occur, they only affect one component (I or Q) of the QAM signal, and the other component remains intact and can be used to recover the original data
Solution Approach 2:
The patent changes the parameter arrangement of the QAM signal by applying different interleaving depths and patterns to the I and Q components. This parameter transformation creates a signal structure where the impact of urgent transmissions is limited to specific portions, allowing the receiver to reconstruct the original data from the unaffected components
3Reliability
If SSD interleaving is applied to protect eMBB data from URLLC collisions, then data reliability is improved, but system complexity increases due to additional processing requirements
Solution Approach 1:
The patent segments the signal processing into separate I and Q component streams, each undergoing independent interleaving and deinterleaving operations. This segmentation allows the use of relatively simple, well-understood interleaving algorithms rather than requiring complex joint processing of the entire QAM signal
Solution Approach 2:
The patent employs periodic interleaving patterns with regular gaps between corresponding I and Q components. These periodic structures can be implemented using simple buffer-based algorithms that operate at fixed intervals, reducing the computational complexity compared to adaptive or dynamic interleaving schemes
Data Source
Figure 1
Figure 2
Figure 3~5
AI summary
Interleaving aspects in the case of Signal Space Diversity (SSD) are considered here, in particular when the SSD transmission is expected to be overlapped by a colliding non-orthogonal Ultra Reliable & Low Latency Communication (URLLC). The interleaver's depth when interleaving I and Q components of a rotated modulated symbol is chosen such that a gap of at least an expected maximum size, measured in transmission units, of a possible colliding wireless signal, is generated between a respective In and Qn component of a same symbol n.