LTE-NR Measurement Triggering for Timely Interworking Handover
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Solution Overview
Problem
In LTE-NR interworking, the UE's behavior regarding dual s-measure configurations leads to inconsistent measurement initiation, preventing necessary measurements on NR frequencies when LTE radio conditions are strong, hindering network decisions for SN change or inter-RAT handover.
Innovation Solution
The UE initiates measurements on both LTE and NR frequencies based on the s-measure criteria of the primary RAT, regardless of the LTE radio conditions, allowing simultaneous measurement initiation across both technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the UE treats s-measures independently for each RAT and only starts measurements when the configuring node's s-measure criteria is fulfilled, then measurement overhead is reduced, but measurement data collection is delayed or prevented when the primary RAT conditions are good
Solution Approach 1:
The patent introduces dynamic adaptability by allowing the UE to switch between two operational modes: independent s-measure evaluation (to reduce overhead) and primary RAT-based measurement initiation (to ensure timely measurements). This dynamic approach enables the system to adapt its measurement behavior based on deployment scenarios and network requirements, resolving the contradiction between overhead reduction and timely measurement initiation.
Solution Approach 2:
The patent changes the control parameter from independent per-RAT s-measure evaluation to primary RAT condition-based control for inter-RAT measurements. By modifying which parameter controls measurement initiation (from secondary RAT's s-measure to primary RAT's s-measure), the system ensures measurements start timely while still maintaining overhead efficiency through conditional activation.
2Quantity of substance
If the UE requires PCell quality to drop below s-measure threshold before starting measurements, then measurement resources are conserved, but network decisions for SN change or inter-RAT handover are hindered
Solution Approach 1:
The patent segments measurement resource allocation by measurement type and RAT. Intra-RAT measurements continue to follow traditional s-measure rules, while inter-RAT measurements are controlled by primary RAT conditions. This segmentation allows the system to conserve resources for intra-RAT measurements while ensuring adequate resources for inter-RAT measurements needed for network decisions.
Solution Approach 2:
The primary RAT's s-measure criteria acts as an intermediary control mechanism for initiating inter-RAT measurements. Instead of requiring the secondary RAT's s-measure threshold to be crossed, the primary RAT's condition serves as the triggering intermediary, enabling network to make informed decisions about SN changes and inter-RAT handovers while still managing measurement resources efficiently.
3Measurement precision
If the UE configures measurements based on secondary RAT's s-measure, then measurement accuracy for that RAT is improved, but simultaneous measurement coverage across both RATs is reduced
Solution Approach 1:
The patent makes the primary RAT's s-measure criteria a universal control mechanism for both intra-RAT and inter-RAT measurements. This multi-functional approach allows a single control parameter (primary RAT's s-measure) to govern measurement initiation across different RATs, ensuring simultaneous measurement coverage while maintaining the precision needed for network decisions.
Data Source
AI summary
According to certain embodiments, a method in a wireless device is provided. The method comprises receiving a first s-measure criteria. The method further comprises performing measurements on a first radio access technology (RAT) and on a second RAT. The second RAT is different than the first RAT. The measurements on the second RAT are performed regardless of whether or not the first s-measure criteria is fulfilled.