Anchored RLF Recovery Across Split PDCP and RLC Nodes
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing radio link failure (RLF) recovery, particularly in 5G NR networks, where improvements are needed to enhance RLF recovery mechanisms, especially when packet data convergence protocol (PDCP) and radio link control (RLC) are anchored on separate network nodes.
Innovation Solution
The proposed solution involves maintaining the PDCP anchor at the original network node while switching the RLC to a new network node during inter-network node cell switch, allowing for efficient RLF recovery by maintaining the RRC connection and minimizing UP data interruption, without requiring security updates or PDCP re-establishment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PDCP and RLC are anchored on separate network nodes during inter-network node cell switch, then RLF recovery efficiency is improved, but device complexity increases
Solution Approach 1:
The patent segments the PDCP and RLC functions to be anchored on separate network nodes during inter-network node cell switch. This segmentation allows independent optimization of each protocol layer's recovery process, enabling efficient RLF handling at the RLC layer while maintaining PDCP data convergence separately, thus improving RLF recovery efficiency without requiring complete system reconfiguration
Solution Approach 2:
The patent introduces an intermediary mechanism where the network node maintains identification information about the UE's serving cell and coordinates with other network nodes to retrieve context information. This intermediary approach enables seamless RLF recovery by mediating between the separated PDCP and RLC anchors, allowing fast recovery without increasing overall system complexity
2Duration of action of moving object
If RRC connection is maintained during RLF recovery, then service continuity is improved, but loss of information increases
Solution Approach 1:
The patent performs preliminary actions by maintaining the RRC connection state and pre-configuring the network node with identification information about the UE's serving cell before RLF occurs. This allows the network to quickly retrieve context information and resume service without interruption, preventing information loss while ensuring service continuity during RLF recovery
Solution Approach 2:
The patent implements a feedback mechanism where the network node receives requests from UEs for RLF recovery and uses stored identification information to retrieve relevant context. This feedback loop ensures that the necessary information is recovered and returned to maintain service continuity, preventing information loss while keeping the RRC connection active
Data Source
AI summary
Apparatus, methods, and computer program products for wireless communication are provided. An example method may include receiving, from a second network node, first identification information associated with a user equipment (UE) corresponding to a first cell, where the first cell is associated with the second network node and is a candidate serving cell for the UE. The example method may further include communicating with the UE based on a radio resource control (RRC) connection via the first cell. The example method may further include receiving, from the UE, a request to re-establish the RRC connection with the UE, where the request includes second identification information for the first cell. The example method may further include transmitting a message to the UE to re-establish the RRC connection with the UE based on a match between the first identification information and the second identification information.