Pathloss Reference Signal Measurement Under Unlicensed-Band LBT
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Solution Overview
Problem
Performing pathloss reference signal (PLRS) measurements in unlicensed bands is challenging due to listen before talk (LBT) restrictions, which can lead to extended measurement periods and unreliable sample timing, especially when LBT failures occur during multiple sample collection.
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 during this period, determines to extend the period if necessary, and listens for PLRS signals during the extended period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple PLRS samples are collected to perform measurement procedure, then measurement reliability is improved, but measurement period extension is required when LBT failure occurs
Solution Approach 1:
The patent implements dynamic adjustment of the PLRS measurement period based on LBT failure detection. The system transitions from a fixed measurement period to a flexible, extendable period that adapts to channel conditions. When LBT failures are detected, the measurement period is automatically extended to allow additional PLRS samples to be collected, ensuring measurement reliability without unnecessarily prolonging the measurement in good channel conditions.
Solution Approach 2:
The system employs feedback mechanisms by monitoring LBT failure events during the PLRS measurement process. The measurement period extension decision is based on feedback from LBT outcomes, creating a closed-loop control system that adjusts measurement timing based on actual channel access success or failure, thereby optimizing both reliability and measurement duration.
2Quantity of substance
If measurement period is extended to accommodate LBT failures, then sufficient PLRS samples can be obtained, but samples may become too far apart in time for reliable measurement
Solution Approach 1:
The patent applies dynamic period extension with constraints to balance sample quantity and temporal proximity. Rather than unlimited extension, the system extends the measurement period just enough to collect the required number of PLRS samples while maintaining maximum temporal closeness between samples. This dynamic approach ensures that samples remain sufficiently close in time for accurate pathloss estimation while obtaining adequate sample counts.
Solution Approach 2:
The system changes the time parameter of the measurement period adaptively. By adjusting the measurement period duration based on the number of samples collected and LBT failure events, the system optimizes the balance between having enough samples and keeping them temporally close. The parameter change ensures that extension occurs only to the extent necessary to achieve sufficient sample quantity without compromising measurement precision.
3Adaptability or versatility
If LBT restriction is implemented in unlicensed bands, then channel access coordination is improved, but PLRS measurement procedure becomes unreliable
Solution Approach 1:
The patent applies preliminary action by proactively extending the measurement period before PLRS samples become too sparse. Rather than waiting for samples to be excessively delayed, the system anticipates potential timing issues and adjusts the measurement period in advance, ensuring that sufficient samples are collected while maintaining their temporal proximity. This preliminary adjustment prevents measurement reliability degradation before it occurs.
Solution Approach 2:
The system uses feedback from LBT outcomes to dynamically adjust measurement reliability. By monitoring channel access success rates and PLRS sample collection status, the system provides feedback-driven adjustments to the measurement procedure, enhancing reliability in the challenging unlicensed band environment where LBT restrictions create variable channel access patterns.
Data Source
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.