Sidelink PRS Timing Advance Alignment for Inter-Symbol Interference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless communication systems face interference and performance degradation due to misaligned reception timing of sidelink positioning reference signals (PRS) from multiple nodes, especially in scenarios where nodes are synchronized with different sources or have varying distances from the target UE, leading to inter-symbol interference.
Innovation Solution
A mechanism for managing sidelink PRS transmissions with a timing advance offset is introduced, where a sidelink node determines and applies timing advance offsets to align PRS receptions from multiple nodes, ensuring that PRS transmissions are received within the same cyclic prefix, thereby mitigating interference and improving signal alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If nodes transmit PRS signals without timing advance alignment, then transmission simplicity is maintained, but reception timing alignment deteriorates causing inter-symbol interference
Solution Approach 1:
The receiving UE performs preliminary timing measurements by receiving initial transmissions from multiple nodes and determining timing advance values before actual PRS transmission. This preliminary timing alignment preparation ensures that when PRS signals are transmitted, they will be properly aligned at the receiver, preventing inter-symbol interference while maintaining transmission simplicity.
2Reliability
If timing advance offsets are applied to align PRS receptions, then reception timing alignment is improved, but system complexity increases
Solution Approach 1:
The receiving UE autonomously determines timing advance values by measuring the timing of initial transmissions from multiple nodes and calculating the necessary offsets. This self-service approach eliminates the need for complex network-controlled timing alignment mechanisms, reducing system complexity while achieving reliable reception timing alignment through UE-based autonomous timing adjustment.
3Adaptability or versatility
If nodes are synchronized with different sources, then network flexibility is improved, but reception timing alignment deteriorates
Solution Approach 1:
The system allows each node to be synchronized with different sources (maintaining network flexibility), but applies local timing advance offsets at the receiving UE specific to each transmitting node. This local quality adjustment ensures that despite diverse synchronization sources, each PRS signal is individually aligned at the receiver, preventing inter-symbol interference while preserving network adaptability.
Data Source
AI summary
This disclosure provides systems, methods, and devices for wireless communication that provide managing transmissions of sidelink positioning reference signals (PRS) with a timing advance offset (TA) from a sidelink node. In aspects, a sidelink node (e.g., a target user equipment (UE) or an assisting UE) may receive transmissions from a plurality of nodes (e.g., target UEs or assisting UEs). The sidelink node obtains at least one TA to be used by a transmitting node of the plurality of nodes for transmitting a sidelink PRS to the sidelink node (e.g., to advance the sidelink PRS transmission to the sidelink node with respect to the timing of the first transmission). The TA is an offset obtained by the sidelink node based on the receiving times of the transmissions from the plurality of nodes. The sidelink node may receive PRS transmissions from the plurality of nodes in a same symbol aligned within the same CP.