Wireless Device Measurement Restriction on Unlicensed Frequencies
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in performing measurements on unlicensed frequencies, particularly in 5G NR standalone operation, where devices spend excessive energy on additional measurements like RSSI or channel occupancy, which may not be necessary for mobility purposes.
Innovation Solution
A method where a wireless device receives configuration to perform first and second measurements on unlicensed frequencies, with one measurement serving as a reference. Based on the result of the reference measurement, the device determines whether to perform the second measurement, optimizing energy usage by skipping unnecessary measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a wireless device performs multiple measurements (RSSI, channel occupancy, etc.) on unlicensed frequencies for mobility purposes, then measurement accuracy and mobility decision quality are improved, but power consumption and resource usage increase significantly
Solution Approach 1:
The patent applies preliminary action by performing an LBT (Listen Before Talk) measurement first as a preliminary check before deciding whether to perform additional mobility measurements. The LBT result serves as an early indicator of channel conditions, allowing the device to pre-determine if further measurements are necessary. This preliminary measurement approach prevents unnecessary execution of power-intensive mobility measurements when the LBT result already provides sufficient information for mobility decisions.
Solution Approach 2:
The patent implements partial action by selectively performing only the necessary subset of measurements based on LBT outcomes. Instead of always performing the full set of measurements (RSSI, channel occupancy, quality measurements), the device performs partial measurements - only those required given the LBT result. This partial measurement strategy maintains measurement accuracy when needed while reducing power consumption when the LBT result is already sufficient for mobility decisions.
2Measurement precision
If a wireless device performs additional measurements like RSSI or channel occupancy on unlicensed frequencies, then mobility measurement completeness is improved, but device complexity and processing overhead increase
Solution Approach 1:
The LBT measurement serves as a preliminary filtering step that simplifies subsequent processing. By evaluating LBT results first, the device can determine whether additional measurements are needed, thereby avoiding the complexity of processing multiple measurement types when they are not required. This preliminary action reduces the average processing complexity across different operational scenarios.
Solution Approach 2:
The patent introduces dynamic measurement processing where the set of measurements to be performed and processed is not fixed but adapts based on LBT outcomes. The measurement processing complexity dynamically adjusts - sometimes requiring full measurement sets, other times requiring only LBT-based decisions. This dynamic approach optimizes the balance between measurement completeness and processing complexity based on real-time channel conditions.
3Reliability
If a wireless device performs comprehensive measurements on unlicensed frequencies, then mobility decision reliability is improved, but time consumption and measurement overhead increase
Solution Approach 1:
The LBT measurement acts as a preliminary rapid assessment that can quickly determine channel suitability without requiring time-consuming additional measurements. When LBT results are conclusive, the device can make mobility decisions based solely on this preliminary information, significantly reducing measurement time while maintaining reliability for clear-cut cases. This preliminary action filters out scenarios where full measurements would be time-wasting.
Solution Approach 2:
The patent applies partial action by performing only the necessary measurements for reliable mobility decisions rather than always performing comprehensive measurement sets. Based on LBT outcomes, the device performs partial measurements - sometimes just LBT, sometimes LBT plus one or two additional measurements, and rarely the full comprehensive set. This partial measurement strategy maintains adequate reliability while reducing average measurement time and overhead.
Data Source
AI summary
A method and apparatus for restricting measurement based on result of a reference measurement in wireless communication system is provided. A wireless device, in a wireless communication system, receives configuration to perform a first measurement and a second measurement from a network, wherein the first measurement and the second measurement belong to different measurement categories. The wireless device performs the first measurement on unlicensed frequency. The wireless device determines whether to perform the second measurement on the unlicensed frequency based on result of the first measurement.