RRC Inactive State Radio Bearer Management for Wireless Communication
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Solution Overview
Problem
In wireless communication systems, particularly in the RRC inactive state, existing technologies face challenges in enabling UE to enter the RRC inactive state early while continuing data transmission, maintaining radio bearers' states, reducing power consumption, and avoiding data interruption.
Innovation Solution
A method involving receiving a message to determine whether to perform specific actions on radio bearers, including suspending or maintaining them based on condition sets, with the option to start a timer for entering the RRC idle state, and utilizing a second message to indicate maintaining or suspending radio bearers' states within a target radio bearer set.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the UE enters RRC inactive state to save power, then power consumption is reduced, but data transmission capability is lost
Solution Approach 1:
The patent applies preliminary action by configuring the UE with SDT capabilities and pre-establishing small data transmission resources before the UE actually needs to transmit data. When data needs to be transmitted, the UE can quickly transition to RRC inactive state and use the pre-configured resources for small data transmission, avoiding the need to fully suspend and resume all radio bearers. This allows the UE to enter RRC inactive state early while maintaining limited data transmission capability through the SDT mechanism.
2Use of energy by moving object
If all radio bearers are suspended upon entering RRC inactive state, then power consumption is reduced, but data transmission continuity is broken
Solution Approach 1:
The patent segments radio bearers into different categories: critical bearers (SRB0, SRB1, SRB2) that must be maintained for control signaling, and non-critical bearers (DRBs, MRBs) that can be suspended. Within non-critical bearers, it further segments into SDT-capable bearers that support small data transmission in inactive state and traditional bearers that do not. This segmentation allows the UE to suspend most bearers for power saving while maintaining essential control bearers and enabling limited data transmission through SDT mechanisms, thus resolving the contradiction between power consumption and data transmission continuity.
3Productivity
If the UE performs full RRC recovery procedure for data transmission, then data transmission capability is restored, but system complexity increases
Solution Approach 1:
The patent extracts the essential functionality needed for small data transmission from the full RRC connection recovery procedure. Instead of requiring complete RRC resume and full bearer re-establishment, the system extracts only the necessary SDT-related configurations and resources. The UE can perform a simplified recovery process that re-establishes only the necessary SDT bearers and uses pre-configured resources, significantly reducing the complexity compared to full RRC recovery while maintaining data transmission capability.
4Use of energy by moving object
If the UE enters RRC inactive state early, then power consumption is reduced, but radio bearer state management becomes complex
Solution Approach 1:
The patent applies local quality by differentiating the treatment of different radio bearers based on their specific characteristics and requirements. Critical bearers (SRB0, SRB1, SRB2) maintain full functionality regardless of UE state. Non-critical bearers are further divided into SDT-capable bearers that can operate in inactive state with limited functionality and traditional bearers that require full RRC connection. This localized differentiation of bearer qualities allows the UE to enter RRC inactive state early for power saving while managing bearer states through clear, hierarchical classification rules that simplify the management complexity.
Data Source
AI summary
The communication node receives a first message, the first message indicating a target radio bearer set; and determines whether to perform a first action set according to whether a first condition set is satisfied, the first action set including suspending a first radio bearer; the target radio bearer set includes at least one radio bearer, and the first radio bearer is one radio bearer in the target radio bearer set; a condition in the first condition set is related to a second message, the second message being used to determine whether to maintain a state of the first radio bearer; the first action set is performed if the first condition set is satisfied; and the first action set is not performed if at least one condition in the first condition set is not satisfied.