Terminal Dual Connectivity RRC Failover for Data Continuity
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Solution Overview
Problem
Existing wireless telecommunications systems face challenges in efficiently supporting diverse data traffic profiles and ensuring high reliability and low latency for Ultra Reliable and Low Latency Communications (URLLC) services, particularly in scenarios where dual connectivity fails to provide full redundancy and independent RRC signaling.
Innovation Solution
Implementing dual connectivity with enhanced redundancy by maintaining simultaneous connections to both master and secondary network access nodes, allowing independent RRC signaling through the secondary node, and establishing two parallel data paths (MCG and SCG bearers) to ensure continuous data transmission even if the primary connection fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dual connectivity is implemented with master and secondary nodes, then reliability is improved through redundancy, but device complexity increases due to maintaining simultaneous connections and managing independent RRC signaling
Solution Approach 1:
The patent segments the RRC signaling function by introducing independent RRC signaling through the secondary node, separate from the master node's control plane. This allows the secondary node to autonomously manage certain signaling functions, reducing the burden on the master node and enabling faster re-establishment without requiring full master node involvement.
Solution Approach 2:
The patent implements preliminary action by pre-configuring the secondary node with necessary context information and establishing independent RRC signaling capabilities before connectivity failures occur. This enables the secondary node to immediately assume RRC signaling responsibilities when the master node connection fails, reducing re-establishment latency.
2Loss of time
If independent RRC signaling through secondary node is enabled, then latency is reduced during re-establishment, but device complexity increases due to dual RRC signaling paths
Solution Approach 1:
The patent introduces the secondary node as an intermediary that can independently handle RRC signaling when the master node is unavailable. The secondary node acts as a mediator that maintains signaling continuity, allowing the UE to re-establish connections faster without directly involving the master node in every signaling exchange.
Solution Approach 2:
The patent adds another dimension to the signaling architecture by establishing parallel RRC signaling paths through both master and secondary nodes simultaneously. This multi-dimensional signaling approach allows the system to switch between paths based on availability, reducing latency while distributing complexity across multiple independent signaling channels.
3Reliability
If two parallel data paths are established, then data continuity is improved during connection failures, but device complexity increases due to managing MCG and SCG bearers
Solution Approach 1:
The patent segments data transmission by establishing separate MCG (Master Cell Group) and SCG (Secondary Cell Group) bearers that operate independently. When the master node connection fails, data transmission can continue through SCG bearers, ensuring data continuity. This segmentation allows failover without requiring complex reconfiguration of the entire data path.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting bearer configuration based on connection status. When the master node becomes unavailable, the system changes parameters to route data through alternative paths using pre-configured SCG bearers, maintaining data flow without requiring complex real-time reconfiguration protocols.
Data Source
AI summary
A method of communicating data by a terminal device in a wireless telecommunication system comprising a first radio access node and a second radio access node, the method comprising establishing an RRC connection with the first radio access node, entering a dual connectivity mode of operation for the terminal device in which the first radio access node acts as a master radio access node and the second radio access node acts as a secondary radio access node, communicating the same first data between the terminal device and the first radio access node and between the terminal device and the second radio access node, determining that radio link failure criteria are satisfied in respect of at least the first radio access node, and communicating second data between the terminal device and the second radio access node.