Multi-RAT Early Measurement Configuration After Cell Reselection
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Solution Overview
Problem
In LTE Release 15, UEs configured with early measurements for a single RAT do not adapt to multi-RAT environments upon cell reselection, leading to incomplete or absent measurements on inter-RAT carriers.
Innovation Solution
Independent handling of LTE and NR measurement configurations, allowing UEs to obtain and perform measurements based on both dedicated and broadcasted configurations from the new cell, ensuring seamless transition and faster CA/DC setup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a UE is configured with early measurements for a single RAT, then the measurement configuration is simple and easy to manage, but the UE cannot perform measurements on inter-RAT carriers after cell reselection
Solution Approach 1:
The measurement configuration is segmented into separate RAT-specific configuration containers (E-UTRA measurement configuration and NR measurement configuration). Each RAT has its own independent configuration set including frequency lists, cell identities, and measurement parameters. This segmentation allows the UE to independently manage and apply configurations for different RATs without interference, enabling multi-RAT measurement capability while maintaining manageable complexity through modular organization.
Solution Approach 2:
The measurement configuration structure is designed to be universal across multiple RATs by defining a common framework that can accommodate both E-UTRA and NR measurements. The configuration includes universal elements such as measurement objects, reporting configurations, and triggering mechanisms that apply to both LTE and NR, while allowing RAT-specific parameters to be filled in appropriately. This multi-functionality enables a single configuration mechanism to serve multiple RATs.
2Loss of information
If the UE stores idle measurements from a source cell, then early measurements are available upon resume, but the network may not be aware that the UE has available measurements stored
Solution Approach 1:
The UE performs preliminary actions by storing idle measurements from the source cell before transitioning to connected mode or resuming the connection. The measurement configurations and results are pre-captured and stored in the UE's memory during idle mode, so that when the network requests early measurements, the UE can immediately provide the pre-stored information without needing to perform new measurements or wait for measurement opportunities.
Solution Approach 2:
A feedback mechanism is implemented where the UE indicates to the network whether it has stored idle measurements available. This feedback allows the network to become aware of the available measurements and appropriately request early measurement reporting. The feedback ensures that measurement information is not lost and that the network can make informed decisions about connection setup and handover based on available measurement data.
Data Source
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AI summary
Systems and methods are disclosed herein for configuration of multi-Radio Access Technology (RAT) early measurements. In one embodiment, a method performed by a wireless communication device comprises receiving system information from a first cell of a first network node and receiving a dedicated release message fromthe first cell comprising idle mode measurement configurations for a first RAT and/or a second RAT. The method further comprises performing a reselection to a second cell served by a second network node and receiving system information from the second cellcomprising idle mode measurement configurations for the first RAT and/or for the second RAT. The method further comprises determining idle mode measurement configurations to be applied while in the second cell based on the idle mode measurement configurations comprised in the dedicated release message from the first cell and the idle mode measurement configurations comprised in the system information from the second cell.