Dual Connectivity Resume Using Delta Configuration Offsets
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Solution Overview
Problem
In wireless communication systems, user equipment (UE) faces challenges in efficiently resuming dual connectivity mode after transitioning from an inactive state to a connected state, due to changes in radio conditions that render stored lower layer master cell group (MCG) and secondary cell group (SCG) configurations unsuitable, leading to increased latency during reconfiguration.
Innovation Solution
The UE performs cell quality measurements while in an inactive state and reports these measurements to the network, receiving an updated lower layer MCG and SCG configuration as an offset of the original configuration, allowing for minimal latency resumption of dual connectivity by restoring the original configuration as a baseline.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the UE restores the original lower layer MCG and SCG configuration when transitioning from inactive to connected state, then the resumption speed is improved, but the configuration becomes unsuitable due to radio condition changes
Solution Approach 1:
The network performs preliminary actions by providing delta configurations (offsets) to the UE before it transitions to inactive state. These delta configurations contain the necessary adjustments to the original MCG and SCG configurations. When the UE resumes in connected state, it applies these pre-prepared offsets to quickly generate an updated configuration that adapts to current radio conditions, thus achieving both fast resumption and configuration suitability.
2Manufacturing precision
If the network provides full reconfiguration messages, then the configuration accuracy is improved, but the signaling overhead increases
Solution Approach 1:
The invention extracts only the essential changes from the full configuration by using delta configurations (offsets). Instead of transmitting complete MCG and SCG configuration messages, the network extracts and transmits only the differential values that need to be applied to the original configuration. This significantly reduces signaling overhead while maintaining configuration accuracy, as the UE applies these extracted offsets to the stored original configuration to reconstruct the updated configuration.
3Adaptability or versatility
If the UE performs measurements and reports in inactive state, then the configuration adaptability is improved, but the power consumption increases
Solution Approach 1:
The UE performs measurement and reporting actions in advance while in inactive state, before transitioning to connected state. By conducting these measurements preliminarily, the network can prepare appropriate delta configurations that reflect current radio conditions. This allows the UE to quickly resume with an already-adapted configuration when transitioning to connected state, improving configuration adaptability while minimizing the duration of high-power measurement activities.
Data Source
AI summary
Generally, the described techniques provide for efficiently identifying a lower layer configuration for communicating in a dual connectivity mode after transitioning from an inactive state to a connected state. To efficiently identify the lower layer configuration, a UE operating in a dual connectivity mode may perform measurements on signals received from a master node, a secondary node, and other nearby nodes in an inactive state. Once the UE decides to transition back to a connected state, the UE may report the measurements and restore an original lower layer configuration used to communicate in a dual connectivity mode. The UE may then receive an indication of an updated lower layer configuration as an offset of the original lower layer configuration, where the updated lower layer configuration may be based on the reported measurements.