Terminal Apparatus NR Secondary Cell Group Release
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Solution Overview
Problem
The complexity of protocol processing in Multi-RAT Dual Connectivity (MR-DC) systems, where E-UTRA and NR technologies differ, hinders efficient communication between base station apparatuses and terminal apparatuses due to varying communication protocols and core networks.
Innovation Solution
A terminal apparatus is designed to determine and manage NR secondary cell group configurations, releasing RLC entities for RRC bearers during re-establishment or resumption of RRC connections, thereby simplifying protocol processing by handling NR-DC and EN-DC configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Multi-RAT Dual Connectivity (MR-DC) is implemented to enable communication with both E-UTRA and NR base stations, then communication versatility is improved, but protocol processing complexity increases
Solution Approach 1:
The patent segments the cell group configuration by introducing separate Master Cell Group (MCG) and Secondary Cell Group (SCG) structures. The SCG is further divided into E-UTRA SCG and NR SCG, allowing independent management of different RAT configurations. This segmentation enables the terminal to handle multiple RATs without overwhelming protocol complexity, as each group can be processed and released independently during RRC connection re-establishment or resumption.
Solution Approach 2:
The patent applies local quality by treating E-UTRA and NR configurations differently within the SCG. Each cell group has specific release conditions and processing requirements tailored to its RAT type. The terminal determines whether to release E-UTRA SCG or NR SCG based on local configuration details, allowing optimized handling of each RAT's specific characteristics while maintaining overall system versatility.
2Reliability
If NR secondary cell group is maintained during RRC connection suspension, then communication continuity is improved, but resource management complexity increases
Solution Approach 1:
The patent implements preliminary action by releasing the NR secondary cell group configuration before the terminal enters RRC INACTIVE state. This advance release simplifies the suspension process and reduces the burden on the terminal during resumption, as the NR SCG is already cleared and does not need to be re-established or re-configured upon returning to connected state.
Solution Approach 2:
The patent introduces dynamic management of the NR secondary cell group based on terminal state transitions. The SCG configuration is actively maintained during connected state for communication continuity, then released upon suspension to INACTIVE state to reduce resource management complexity. This dynamic approach allows the system to adapt resource allocation to actual operational needs, balancing continuity and complexity management.
Data Source
AI summary
A terminal apparatus includes: a processing unit configured to determine, in a case that the terminal apparatus requests re-establishment of an RRC connection, whether or not the terminal apparatus is configured with NGEN-DC, release, in a case that the terminal apparatus is configured with NGEN-DC, an NR secondary cell group, and release, in the release of the NR secondary cell group, an RLC entity for an RLC bearer configured for the NR secondary group.