PLRS Measurement Timing in Unlicensed Bands Under LBT Constraints
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Solution Overview
Problem
Performing pathloss reference signal (PLRS) measurements in unlicensed frequency bands is challenging due to listen before talk (LBT) restrictions, which can lead to extended measurement periods and unreliable sample timing, affecting the reliability of PLRS procedures.
Innovation Solution
A wireless device accumulates a first number of PLRS measurements within a PLRS switching period, measures a second number less than the first, determines to extend the period, and listens for PLRS signals during the extended period to ensure reliable measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wireless device uses multiple samples to perform PLRS measurement, then measurement reliability is improved, but measurement period extension is required when LBT failure occurs
Solution Approach 1:
The patent configures the wireless device with a pre-determined maximum number of PLRS measurement occasions and a maximum measurement period extension threshold before actual measurement begins. When LBT failure occurs, the device can immediately determine whether extension is needed by comparing the number of missed occasions against the pre-configured threshold, avoiding complex real-time decisions and reducing signaling overhead.
Solution Approach 2:
The patent introduces configurable parameters including maximum PLRS measurement occasions, maximum measurement period extension, and thresholds for determining when extension should occur. These parameters can be adjusted based on channel conditions and QoS requirements, allowing the system to adapt the measurement process dynamically while maintaining reliable measurements even when LBT failures occur.
2Reliability
If the measurement period is extended to accommodate LBT failures, then PLRS sample availability is improved, but sample timing becomes unreliable
Solution Approach 1:
The patent pre-configures the maximum number of PLRS measurement occasions and establishes timing relationships before measurement begins. This allows the device to maintain accurate timing expectations even when the measurement period is extended, as the extension follows pre-defined rules rather than ad-hoc adjustments.
Solution Approach 2:
The patent implements a feedback mechanism where the device monitors the number of PLRS measurement occasions and compares against configured thresholds. Based on this feedback, the device determines whether to extend the measurement period and by how much, using pre-configured parameters to maintain timing accuracy throughout the extension process.
3Adaptability or versatility
If the wireless device performs PLRS measurement in unlicensed bands, then spectrum utilization is improved, but LBT restrictions cause measurement failures
Solution Approach 1:
The patent makes the PLRS measurement process dynamic by allowing the measurement period to be extended based on actual LBT failure conditions. The device can adapt the measurement duration and timing according to channel access success, maintaining reliability in unlicensed bands while preserving the ability to utilize available spectrum opportunities.
Solution Approach 2:
The patent introduces configurable parameters that allow the measurement process to adapt to unlicensed band conditions. By adjusting the maximum number of measurement occasions, extension thresholds, and timing parameters, the system can optimize PLRS measurement reliability specifically for LBT-based access while maintaining spectrum utilization efficiency.
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AI summary
A technique for wireless communications in a wireless system including: receiving, by a wireless device, a request to perform a pathloss reference signal (PLRS) measurement procedure in an unlicensed band, wherein the wireless device is configured to accumulate a first number of PLRS measurements within a PLRS switching period to perform the PLRS measurement procedure, wherein the first number of PLRS measurements is more than one, measuring, by the wireless device, a second number of PLRS signals during the PLRS switching period, wherein the second number is less than the first number of PLRS measurements within the PLRS switching period, determining, by the wireless device, to extend the PLRS switching period, and listening, by the wireless device, for a PLRS signal during the extended PLRS switching period.