Aperiodic PRS Triggering for Low-Latency 5G Positioning
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Solution Overview
Problem
Existing 5G NR systems with periodical DL PRS transmissions are inefficient in power and resource usage, fail to adapt to mobility user equipment, and cannot dynamically update QCL information, leading to communication failures and difficulty in meeting UE's temporary positioning requirements.
Innovation Solution
Implementing aperiodic positioning reference signals (PRS) through terminal and network entity configurations, including trigger state identification, frequency layer ID, node ID, and PRS resource set ID, with DCI triggering and measurement gaps to ensure efficient and dynamic PRS transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If downlink positioning reference signal (DL PRS) uses periodical transmissions, then transmission scheduling is simple and stable, but power and resource efficiency deteriorates and adaptability to mobility user equipment is lost
Solution Approach 1:
The patent applies dynamics by transitioning from fixed periodical transmissions to flexible aperiodic transmissions. The network can dynamically trigger PRS transmissions based on UE mobility states and positioning requirements, allowing the system to adapt transmission behavior to changing conditions rather than following a rigid periodic schedule.
Solution Approach 2:
The patent changes the transmission parameter from fixed periodicity to variable aperiodic timing. By introducing trigger-based transmission with configurable time offsets and multiple trigger states, the system can adjust transmission timing parameters dynamically to match UE mobility patterns and positioning needs, improving both adaptability and efficiency.
2Measurement precision
If downlink positioning reference signal (DL PRS) uses periodical transmissions, then system complexity is low, but ability to meet temporary requirements for low latency positioning and high accuracy deteriorates
Solution Approach 1:
The patent implements preliminary action by pre-configuring multiple trigger states with different PRS resource settings before actual positioning events occur. When a positioning request arises, the network can immediately activate the appropriate pre-configured state without needing to establish new transmission parameters, thereby achieving low-latency high-accuracy positioning while keeping the real-time control logic relatively simple.
Solution Approach 2:
The patent introduces trigger states as an intermediary layer between positioning requests and actual PRS transmissions. This intermediary structure allows complex positioning requirements to be mapped to predefined transmission configurations, simplifying the control mechanism while enabling flexible adaptation to different positioning accuracy and latency requirements.
3Productivity
If downlink positioning reference signal (DL PRS) uses periodical transmissions, then resource allocation is straightforward, but resource efficiency and power efficiency deteriorate
Solution Approach 1:
The patent reinterprets periodic action by using aperiodic transmissions triggered by specific events rather than continuous periodic transmissions. PRS is transmitted only when triggered by positioning requests or mobility events, eliminating unnecessary transmissions during periods when positioning is not required, thereby improving both resource efficiency and power efficiency.
Solution Approach 2:
The patent extracts the essential positioning function from continuous periodic transmissions and implements it through event-triggered aperiodic transmissions. By removing unnecessary periodic transmissions and keeping only the essential positioning-related transmissions, the system achieves better resource and power efficiency while maintaining positioning capability.
Data Source
AI summary
A wireless communication method for use in a wireless terminal is disclosed. The wireless communication method comprises receiving, from a network entity, a terminal configuration associated with an aperiodic positioning reference signal (PRS), receiving, from a serving node of the wireless terminal, downlink control information (DCI) of triggering at least one of the aperiodic PRSs, and receiving the at least one of the aperiodic PRSs based on the received DCI and the terminal configuration.