Subchannel-Based PRS Scheduling for 5G V2X Positioning
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Solution Overview
Problem
In wireless communication systems, particularly in 5G networks, there is a challenge in efficiently managing and scheduling positioning reference signals (PRS) to minimize collisions between PRS patterns from multiple anchor nodes, especially when the number of anchor nodes exceeds the number of available PRS patterns, which can lead to interference and reduced positioning accuracy in V2X communication scenarios.
Innovation Solution
A subchannel-based PRS scheduling method where each subchannel is allocated a unique identification (ID) and a PRS pattern is mapped to this ID, allowing for time division multiplexing of resource pools based on priority settings, ensuring orthogonality and minimizing collisions between PRS patterns from different anchor nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple anchor nodes transmit PRS patterns simultaneously, then positioning coverage is improved, but PRS pattern collisions increase causing interference
Solution Approach 1:
The patent segments the PRS resource space by introducing subchannel-based PRS patterns where different anchor nodes transmit PRS on different subchannels. This segmentation allows multiple anchor nodes to transmit simultaneously without collision, as each anchor node is assigned a unique subchannel ID, thereby expanding positioning coverage while avoiding interference.
Solution Approach 2:
The patent adds a frequency dimension to PRS transmission by utilizing subchannels. Instead of only time-domain multiplexing, the solution introduces frequency-domain separation through subchannel IDs, allowing anchor nodes to be distinguished and transmitted simultaneously on different frequency resources, thus resolving the contradiction between coverage and interference.
2Measurement precision
If the number of anchor nodes exceeds the number of available PRS patterns, then positioning accuracy is improved through more anchor nodes, but resource allocation becomes insufficient causing collisions
Solution Approach 1:
The patent introduces dynamic resource allocation where subchannel IDs are dynamically assigned to anchor nodes based on their priority values. High-priority anchor nodes receive dedicated subchannels, while lower-priority nodes share remaining resources. This dynamic approach allows the system to accommodate more anchor nodes than static PRS patterns would allow, maintaining positioning accuracy through efficient resource utilization.
Solution Approach 2:
The patent changes the parameter space by introducing subchannel IDs as an additional dimension for PRS identification. This parameter expansion allows the system to distinguish between more anchor nodes than the original PRS pattern limit, enabling support for exceeding anchor nodes while maintaining unique resource allocation through the combination of PRS patterns and subchannel IDs.
3Productivity
If PRS patterns are multiplexed without priority-based scheduling, then resource utilization is improved, but collisions between high-priority PRS patterns increase
Solution Approach 1:
The patent applies local quality by differentiating resource allocation based on priority levels. High-priority anchor nodes receive guaranteed subchannel resources, while lower-priority nodes utilize remaining resources. This localized quality approach ensures that critical positioning operations maintain high reliability through dedicated resources, while overall system resource utilization remains efficient through shared resources for lower-priority nodes.
Data Source
AI summary
In a method for user equipment in a wireless communication system according to an aspect of the present disclosure, a physical sidelink control channel (PSCCH) is received from a plurality of anchor nodes (ANs) on a plurality of subchannels, wherein each of the plurality of subchannels comprises at least one resource block, and, on the basis of the PSCCH, a plurality of positioning reference signals (PRSs) are received from the plurality of ANs, a subchannel identification (ID) is allocated to each of the plurality of subchannels, and the PRS pattern of each of the plurality of PRSs is mapped to the subchannel ID.