Dormant State Measurements Across Inter-RAT Cell Reselection
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Solution Overview
Problem
Existing solutions do not clearly define how to handle inactive/idle measurements when a wireless device performs inter-Radio Access Technology (RAT) cell reselection, leading to ambiguity between UE and network behavior regarding measurement configurations and results.
Innovation Solution
A method for a wireless device to receive dormant state measurement configurations, perform measurements in a first dormant state, and upon inter-RAT cell reselection, handle these configurations by stopping or releasing them, transitioning to a second dormant state, and optionally reporting early measurements to the target RAT network node.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE continues to perform idle measurements according to source RAT configuration after inter-RAT cell reselection, then measurement continuity is maintained, but the UE consumes unnecessary power and may report invalid measurements to the target RAT network node
Solution Approach 1:
The network node provides configuration information to the UE before inter-RAT cell reselection occurs, indicating whether the UE should continue or stop idle measurements. This preliminary action allows the UE to avoid performing unnecessary measurements after reselection, thereby reducing power consumption while ensuring measurement validity when needed.
2Use of energy by moving object
If the UE stops idle measurements after inter-RAT cell reselection, then power consumption is reduced, but measurement continuity is interrupted and the UE may need to reconfigure measurements
Solution Approach 1:
The network node provides configuration information in advance indicating whether the UE should continue or stop idle measurements after inter-RAT cell reselection. This allows the UE to maintain measurement continuity when required without unnecessary power consumption, and to stop measurements when appropriate to save energy without causing measurement setup delays.
3Productivity
If the UE reports idle measurements to the target RAT network node without clear configuration, then early measurement reporting is enabled, but ambiguity arises between UE and network behavior
Solution Approach 1:
The network node provides explicit configuration information to the UE regarding whether to continue or stop idle measurements after inter-RAT cell reselection. This feedback mechanism eliminates behavioral ambiguity between UE and network, ensuring that the UE reports measurements only when the network expects them, thereby enabling fast connection setup without information loss.
Data Source
AI summary
Systems and methods are disclosed herein that relate to handling of dormant state measurement configurations and associated measurements upon inter-Radio Access Technology (RAT) cell reselection. In some embodiments, a method performed by a wireless device comprises receiving one or more dormant state measurement configurations from a network node of a source RAT, performing measurements while in a dormant state in accordance with at least one of the one or more dormant state measurement configurations, and performing an inter-RAT cell reselection from the source RAT to a target RAT while in the dormant state. The method further comprises, upon performing the inter-RAT cell reselection, performing one or more actions to handle dormant state measurement configurations and/or measurements performed in accordance with dormant state measurement configurations. Corresponding embodiments of a wireless device are also disclosed.