PRS Reception in Unlicensed Bands via Channel Sensing
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently receiving and measuring positioning reference signals, particularly in multi-node systems where signal accuracy and interference management are critical for high-data throughput and precise location-based services.
Innovation Solution
A method for receiving positioning reference signals (PRS) through one or more unlicensed band cells, involving configuration information transmission, measurement, and reporting to a serving base station, with options for subframe configuration, channel sensing, and aperiodic uplink reference signal transmission, enhancing measurement accuracy and interference management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If positioning reference signal measurement is performed in multi-node systems with unlicensed band cells, then positioning accuracy and interference management are improved, but signal reception reliability and measurement precision deteriorate due to channel access conflicts and interference from other systems
Solution Approach 1:
The base station performs channel sensing before transmitting the positioning reference signal to determine if the channel is idle. This preliminary action prevents transmission during busy periods, ensuring reliable signal reception and improving positioning accuracy by avoiding interference from other systems sharing the unlicensed spectrum
Solution Approach 2:
The method implements a feedback mechanism where the base station monitors channel status and adjusts PRS transmission timing accordingly. When the channel is sensed as busy, transmission is deferred, creating a feedback loop that maintains both reliability and measurement precision in dynamic unlicensed band environments
2Measurement precision
If positioning reference signal is transmitted continuously to improve measurement accuracy, then positioning precision is improved, but energy consumption and interference to other systems increase
Solution Approach 1:
Instead of continuous transmission, the positioning reference signal is transmitted periodically only when the channel is sensed as idle. This periodic action based on channel availability reduces energy consumption while maintaining positioning measurement accuracy by ensuring transmissions occur during interference-free periods
Solution Approach 2:
The system uses the base station's own channel sensing capability to determine transmission timing, making the transmission schedule self-adjusting based on real-time channel conditions. This self-service approach optimizes energy usage while preserving measurement accuracy without requiring external coordination
3Object-affected harmful factors
If channel sensing is performed before PRS transmission to reduce interference, then interference management is improved, but transmission delay and time consumption increase
Solution Approach 1:
The system performs a partial channel sensing check (listening for a specific duration) before PRS transmission rather than continuous monitoring. This partial action provides sufficient interference detection to protect positioning accuracy while limiting the time penalty to a manageable level
Data Source
AI summary
Disclosed is a method for receiving a reference signal for determining location by means of one or more unlicensed band cells in a wireless communication system, and the method, carried out by a terminal, may comprise the steps of: receiving configuration information associated with a positioning reference signal (PRS) transmitted by means of one or more unlicensed band cells, the PRS-related configuration information comprising information regarding the subframe from which the PRS is transmitted; receiving and measuring the PRS by means of the PRS-related configuration information; and reporting the results of the PRS measurement to a serving base station.