Conditional Cell Configuration for Low-Latency RRC Inactive Transitions
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Solution Overview
Problem
Existing wireless communication systems face challenges in reducing latency and signaling overheads during transitions between RRC (Radio Resource Control) states, particularly when switching to and from the RRC inactive state, which affects efficient network connectivity and resource management.
Innovation Solution
Implementing a conditional cell configuration mechanism that allows wireless devices to transition to the RRC inactive state with a suspend configuration, enabling efficient management of network resources and reducing latency by allowing devices to apply the configuration upon transitioning to the RRC connected state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a wireless device transitions to RRC inactive state to save resources, then network resource utilization is improved, but transition latency and signaling overheads increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring cell parameters (such as physical cell ID, frequency, and other transmission parameters) before the device actually transitions to the RRC inactive state. These pre-configured parameters are stored and can be immediately applied when the device needs to resume connected state, eliminating the need for time-consuming reconfiguration during state transitions and thus reducing transition latency while maintaining efficient resource utilization in inactive state.
2Reliability
If full cell configuration is maintained during RRC inactive state, then connection reliability is improved, but signaling overheads and storage requirements increase
Solution Approach 1:
The patent extracts and separates essential cell configuration parameters from the complete cell configuration. Only the most critical parameters (such as physical cell ID, frequency information, and basic transmission settings) are maintained during RRC inactive state, while less critical or dynamically adjustable parameters are omitted or simplified. This selective retention approach ensures connection reliability is maintained through the essential parameters while significantly reducing signaling overheads and storage requirements compared to maintaining the full configuration.
Solution Approach 2:
The patent applies parameter changes by differentiating the level of configuration detail maintained in different RRC states. In RRC inactive state, cell parameters are maintained at a simplified level (essential parameters only), while in RRC connected state, the full detailed configuration is restored. This dynamic parameter management allows the system to optimize between connection reliability and signaling overheads by adapting the configuration depth to the operational state requirements.
3Reliability
If cell configuration is re-applied upon transitioning to RRC connected state, then connection reliability is improved, but transition time increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring and storing essential cell parameters during RRC connected state before the device transitions to inactive state. These pre-stored parameters (physical cell ID, frequency, basic transmission settings) are ready for immediate application when the device resumes connected state, eliminating the need for time-consuming reconfiguration during transition and thus reducing transition time while maintaining connection reliability through the pre-established parameter configuration.
Data Source
AI summary
A wireless device receives, while in a radio resource control (RRC) connected state, via a first cell, one or more messages. The one or more messages comprise a conditional cell configuration of a second cell, an indication to allow the wireless device to apply the conditional cell configuration in an RRC inactive state, and a suspend configuration for the RRC inactive state. The wireless device transitions, based on the suspend configuration, to the RRC inactive state. The wireless device applies, in the RRC inactive state, the conditional cell configuration. The applying is based on determining to transition, via the second cell, to an RRC connected state, and the indication to allow the wireless device to apply the conditional cell configuration in the RRC inactive state.