PDCP Entity Secrecy Key Reconfiguration for Handover
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Solution Overview
Problem
Current LTE and NR technologies face challenges in efficiently controlling mobility during handover processes, particularly in minimizing user data interruption and improving handover robustness, with a lack of detailed operations for terminal apparatus mobility control.
Innovation Solution
The implementation of a terminal apparatus and method that reconfigures a PDCP entity for a data radio bearer based on messages received from a base station, using specific secrecy keys for secure data transmission, allowing for efficient mobility processing and handover management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a terminal apparatus performs mobility control during handover in LTE and NR systems, then handover robustness is improved, but user data interruption increases and mobility control efficiency decreases
Solution Approach 1:
The patent applies preliminary action by configuring multiple secrecy keys (first secrecy key for source, second secrecy key for target) in advance within the PDCP entity before handover occurs. This allows the terminal to quickly switch encryption keys during handover without interrupting user data transmission, thereby reducing user data interruption time while maintaining handover robustness through pre-configured security parameters
2Productivity
If detailed operations for terminal mobility control are implemented, then mobility control efficiency is improved, but device complexity increases
Solution Approach 1:
The patent merges mobility control functions by integrating source and target secrecy key configuration into a single PDCP entity structure. Instead of implementing separate complex mobility control procedures, the invention combines security key management for both source and target cells within the same PDCP layer, simplifying the terminal apparatus architecture while improving mobility control efficiency through unified key management
Data Source
AI summary
A terminal apparatus is provided. The terminal apparatus includes a receiver configured to receive a first message from a base station apparatus, and a processing unit configured to modify first data radio bearer configuration configured for the terminal apparatus, based on the first message. A first PDCP entity is reconfigured as a packet data convergence protocol (PDCP) entity for the first data radio bearer. A first secrecy key for a source and a second secrecy key for a target are configured for the first PDCP entity as secrecy keys for the first data radio bearer. In a case that the first message includes first information and second information, the second secrecy key for the target of the first PDCP entity is configured based on the second information. In a case that the first message does not include the first information, the first secrecy key for the source is applied to the second secrecy key for the target of the first PDCP entity.