Aperiodic Reference Signal Triggering for Low Latency Positioning
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently triggering on-demand downlink reference signals for positioning in industrial IoT scenarios, particularly in achieving low latency and high accuracy, as existing methods lack support for aperiodic and semi-persistent DL RS configurations.
Innovation Solution
The implementation of methods and systems that allow for the configuration and activation of aperiodic reference signals, such as PRS and CSI-RS, through new information elements and triggers within the DCI, enabling on-demand transmission and reporting of positioning data, with support for multiple resource sets and quasi-collocation information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If periodic downlink reference signals are used for positioning, then positioning coverage is ensured, but positioning latency increases and network efficiency decreases
Solution Approach 1:
The patent implements dynamic switching between periodic and aperiodic downlink reference signal transmission modes. The network can adaptively select the transmission mode based on positioning service requirements, enabling low-latency positioning when needed while maintaining network efficiency during normal operations. This dynamic approach resolves the contradiction by making the system flexible rather than fixed in one mode.
Solution Approach 2:
The patent changes the transmission parameter of downlink reference signals from fixed periodic to variable aperiodic timing. By introducing aperiodic transmission with configurable timing offsets and triggering mechanisms, the system can reduce positioning latency on demand while avoiding continuous transmission overhead, thus improving network efficiency.
2Measurement precision
If aperiodic reference signals are implemented for on-demand positioning, then positioning latency is reduced and accuracy is improved, but system complexity increases
Solution Approach 1:
The patent pre-configures aperiodic reference signal parameters including timing offsets, resource allocations, and triggering conditions during system setup. This preliminary configuration stores multiple ready-to-use parameter sets that can be quickly activated without real-time computation, reducing the operational complexity while enabling high-accuracy on-demand positioning.
Solution Approach 2:
The patent introduces an intermediary layer of pre-defined parameter configurations and standardized triggering mechanisms between the positioning request and the actual aperiodic reference signal transmission. This intermediary structure simplifies the control logic by providing a structured interface for activating aperiodic signals, managing the complexity of coordinating multiple nodes and UEs.
3Measurement precision
If continuous downlink reference signal transmission is used, then positioning accuracy is maintained, but network overhead increases and energy consumption rises
Solution Approach 1:
The patent uses periodic triggering mechanisms for aperiodic reference signal transmission, where signals are sent at predetermined intervals or upon specific events rather than continuously. This periodic action maintains positioning accuracy by ensuring signals are available when needed while significantly reducing energy consumption compared to continuous transmission.
Solution Approach 2:
The patent enables the system to self-regulate reference signal transmission based on positioning service activation. When positioning services are not active, the network automatically stops transmitting downlink reference signals, eliminating unnecessary energy consumption while maintaining the capability to resume transmission when positioning accuracy is required.
Data Source
AI summary
A method by a wireless device includes receiving, from a first network node, assistance information that includes at least one information element that indicates at least one resource type associated with at least one reference signal (RS). The at least one resource type indicates at least one type of RS selected from: Positioning Reference Signal (PRS), Channel State Information-Reference Signal (CSI-RS), and Tracking Reference Signal (TRS).