PRS Resource Reservation in Wireless Networks
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Solution Overview
Problem
In wireless communication networks, positioning reference signal (PRS) measurements can cause unwanted behavior, such as dropping ongoing priority data reception, due to gapless PRS measurements, leading to network latency and increased location measurement latency.
Innovation Solution
Implementing hand-shaking between a location server and a radio network node to guarantee PRS resources are not dropped during measurement occasions, allowing for dynamic indication of maintained or dropped PRS resources, and prioritizing PRS transmission over data during reserved time occasions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gapless PRS measurements are performed, then measurement precision is improved, but data reception reliability deteriorates due to dropping ongoing priority data
Solution Approach 1:
The system dynamically adjusts the measurement approach based on data priority. For high-priority data, the network node sends a priority data indication to switch from gapless to gapped measurements, allowing the measurement strategy to adapt to changing traffic conditions and maintain both measurement precision and data reliability
Solution Approach 2:
The measurement process is segmented into different modes: gapless measurements for normal traffic and gapped measurements for high-priority data. This segmentation allows the system to apply the appropriate measurement strategy based on current traffic conditions, resolving the contradiction between continuous measurement and data reception
2Reliability
If PRS measurements are dropped in favor of downlink data, then data reception reliability is improved, but measurement precision deteriorates and location measurement latency increases
Solution Approach 1:
The network node receives feedback about data priority and measurement status, then dynamically adjusts measurement configuration. When high-priority data is detected, the system switches to gapped measurements; when data priority is normal, it resumes gapless measurements, creating a feedback loop that maintains both data reliability and measurement precision
Solution Approach 2:
The measurement configuration is made dynamic rather than static. The system can switch between gapless and gapped measurement modes based on real-time data priority conditions, allowing it to optimize for measurement precision when appropriate and for data reliability when needed
3Measurement precision
If the location server requests fresh measurements after response time, then measurement precision can be maintained, but network latency increases
Solution Approach 1:
The network node takes preliminary action by detecting high-priority data before measurements are dropped and proactively switches to gapped measurement mode. This prevents measurement degradation rather than reacting to it, reducing the need for fresh measurement requests and minimizing network latency
4Reliability
If radio network node prioritizes data over PRS transmission, then data reception reliability is improved, but measurement precision deteriorates due to larger latency
Solution Approach 1:
The prioritization strategy is made dynamic based on data priority indicators. The network node can switch between prioritizing data and prioritizing PRS transmission depending on the priority level of incoming data, allowing it to maintain measurement precision when data priority is low while ensuring data reliability when priority is high
Data Source
AI summary
A radio network node (14) is configured for use in a wireless communication network (10). The radio network node (14) transmits, to a location server, signaling (18) indicating one or more time occasions (22) reserved by the radio network node (14) for positioning reference signal, PRS, transmission (16). In some embodiments, the radio network node (14) performs PRS transmission (16) in the one or more time occasions (22) indicated. The radio network node (14) may correspondingly refrain from scheduling any transmission other than PRS transmission (16) in the one or more time occasions (22) indicated as reserved for PRS transmission (16), or drop any transmission other than PRS transmission (16) scheduled for transmission in the one or more time occasions (22) indicated as reserved for PRS transmission (16).