Terminal PDCP Entity Release for Multi-RAT Protocol Complexity
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Solution Overview
Problem
The complexity of protocol processing between E-UTRA and NR radio access technologies hinders efficient communication between terminal apparatuses and base station apparatuses due to differences in communication protocols, making dual connectivity challenging.
Innovation Solution
A terminal apparatus is designed to receive RRC connection reconfiguration messages and release PDCP entities when a full configuration is indicated, aligning EPS bearer identities with existing configurations to simplify protocol processing and enhance communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Multi-RAT Dual Connectivity is implemented to enable communication with both E-UTRA and NR base stations, then connectivity and communication capability are improved, but protocol processing complexity increases
Solution Approach 1:
The patent extracts and removes PDCP entities from the protocol stack when full configuration is indicated in RRC reconfiguration messages. This extraction principle reduces the number of active protocol entities that need to be managed and processed, thereby lowering protocol processing complexity while maintaining the ability to support multi-RAT dual connectivity through selective entity management
2Reliability
If PDCP entities are maintained for all EPS bearers in multi-RAT dual connectivity mode, then communication reliability is improved, but resource consumption and processing overhead increase
Solution Approach 1:
Instead of maintaining PDCP entities for all EPS bearers unconditionally, the patent applies partial action by selectively releasing PDCP entities based on specific conditions (full configuration indication in RRC messages and matching EPS bearer identities). This partial release strategy maintains reliability for necessary bearers while reducing processing overhead by eliminating redundant PDCP entity management
Data Source
AI summary
A terminal apparatus for communicating with one or more base station apparatuses, the terminal apparatus including: a receiver configured to receive an RRC connection reconfiguration message including a DRB configuration from the one or more base station apparatuses; and a processing unit configured to release a PDCP entity, in a case that information indicating that a full configuration is applied is included in the RRC connection reconfiguration message, and that a value of an EPS bearer identity included in the DRB configuration is part of a current configuration of the terminal apparatus, and that the PDCP entity is configured on a DRB corresponding to the EPS bearer identity.