RRC Connection Resume with Pre-configured SCG Access
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Solution Overview
Problem
Current 5G communication systems face challenges in efficiently managing radio resource control (RRC) connections, particularly in scenarios involving secondary cell groups (SCGs) and multi-radio access technology-dual connectivity (MR-DC), which affect service provision and network performance, especially in IoT environments.
Innovation Solution
A method and apparatus for performing an RRC connection resume procedure that involves receiving RRC release messages, transitioning to an RRC_INACTIVE mode, and initiating random access procedures with secondary base stations based on SCG configuration information, with mechanisms for reporting failures and determining channel state information to optimize connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs a complete RRC connection resume procedure with the first base station, then the RRC connection can be reliably restored, but the connection resume time and signaling overhead increase
Solution Approach 1:
The network pre-configures the UE with SCG configuration information and second base station parameters before the UE needs to resume connection. This preliminary configuration is stored in the UE's inactive AS context, allowing the UE to directly access the second base station without first establishing connection with the first base station, thereby reducing connection resume time while maintaining reliability
Solution Approach 2:
The first base station acts as an intermediary that provides the UE with pre-configured SCG information and second base station parameters during the RRC release message. This intermediary role allows the UE to bypass the first base station for initial access while still maintaining network control and connection reliability through the pre-established configuration
2Reliability
If the network provides detailed SCG configuration information to the UE, then the secondary cell group connectivity is improved, but the signaling overhead and message size increase
Solution Approach 1:
The patent extracts only the essential SCG configuration information and second base station parameters needed for direct access and places them in the RRC release message. The UE stores this extracted configuration in its inactive AS context, avoiding the need to transmit the entire configuration set during connection resume, thereby reducing signaling overhead while maintaining connectivity
Solution Approach 2:
The network performs preliminary configuration of SCG parameters and second base station information before the UE enters inactive state. This pre-packaging of configuration data eliminates the need for extensive signaling during connection resume, as the UE already possesses the necessary configuration information stored from the preliminary action
3Productivity
If the UE stores comprehensive inactive AS context information, then the connection resume efficiency is improved, but the UE memory requirements and processing complexity increase
Solution Approach 1:
The UE extracts and stores only the critical elements of the inactive AS context, specifically the SCG configuration information and second base station parameters, rather than maintaining comprehensive context data. This selective extraction reduces memory requirements and processing complexity while preserving the essential information needed for efficient connection resume
Solution Approach 2:
The network performs preliminary configuration and the UE stores only the necessary parameters during the RRC release phase. This preliminary action ensures that the UE maintains a compact, essential set of configuration data in its inactive AS context, balancing resume efficiency with reduced memory and processing requirements
4Speed
If the UE performs random access procedure with the second base station based on pre-configured information, then the access speed is improved, but the probability of access failure due to information mismatch increases
Solution Approach 1:
The UE monitors the random access procedure outcome with the second base station. If access fails or channel state information indicates poor conditions, the UE can report this feedback to the network. The network can then provide updated configuration information, creating a feedback loop that maintains access success probability while preserving the speed benefits of direct access
Solution Approach 2:
The system transitions from static pre-configured access to a dynamic approach where the UE can detect access conditions and request configuration updates. This dynamic mechanism allows the system to adapt to changing radio conditions, maintaining both fast access speed and high success probability by updating configurations when mismatches are detected
Data Source
AI summary
Provided is a method of performing a radio resource control (RRC) connection resume procedure by a user equipment (UE), the method including receiving an RRC release message including suspend configuration information, transiting to an RRC_INACTIVE mode, based on the RRC release message, performing an RRC connection resume procedure with a first base station if a certain condition is satisfied, receiving, from the first base station, an RRC resume message including secondary cell group (SCG) configuration information, and performing a random access procedure with a second base station, based on the SCG configuration information.