DRB Configuration via PDCP Version Indication in MR-DC
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Solution Overview
Problem
The complexity of protocol processing in Multi-RAT Dual Connectivity (MR-DC) systems, specifically between E-UTRA and NR, hinders efficient communication due to differences in communication protocols, making it challenging for base stations and terminal apparatuses to communicate effectively.
Innovation Solution
A terminal apparatus and base station apparatus that receive and transmit Radio Resource Control (RRC) reconfiguration messages, including radio bearer configurations, to perform radio bearer modifications based on Packet Data Convergence Protocol (PDCP) version changes, facilitating efficient communication by correctly configuring data radio bearers (DRBs).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Multi-RAT Dual Connectivity (MR-DC) is implemented to enable communication between E-UTRA and NR base stations, then communication versatility and network capability are improved, but protocol processing complexity increases due to format and function differences between E-UTRA and NR protocols
Solution Approach 1:
The patent introduces an intermediary mechanism where the base station adds specific indication information (such as a flag or identifier) to the RRC reconfiguration message to clearly indicate whether PDCP version change is configured. This intermediary element mediates between the E-UTRA and NR protocol stacks, allowing the terminal to correctly interpret the message format and function without requiring complex protocol translation or interpretation logic, thus reducing protocol processing complexity while maintaining MR-DC versatility
2Adaptability or versatility
If protocol formats and functions differ between E-UTRA and NR in MR-DC systems, then multi-radio access technology support is improved, but communication efficiency deteriorates due to increased protocol processing complexity
Solution Approach 1:
The patent applies parameter changes by modifying the RRC reconfiguration message to include explicit indication information about PDCP version change configuration. This parameter addition allows the terminal apparatus to quickly determine the appropriate processing mode without extensive protocol analysis, thereby improving communication efficiency while maintaining support for multiple radio access technologies through the flexible message structure
Data Source
AI summary
To provide a terminal apparatus, a base station apparatus, a communication method, and an integrated circuit which are capable of efficient communication. The terminal apparatus includes a receiver configured to receive a message for adding a data radio bearer (DRB) including information of an EPS bearer identity, and a processing unit configured to notify to a NAS layer that the DRB indicated by the message is established and an EPS bearer identity of the established DRB in a case that the message does not include first information, and not to notify to the NAS layer that the DRB indicated by the message is established and an EPS bearer identity of the established DRB in a case that the message includes the first information.