Relay Node Data Communication Error Recovery
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Solution Overview
Problem
In Relay Enhanced Cell (REC) topologies, the RLC layer at relay nodes cannot support fast local error recovery during handovers without risking data loss, as buffered data is deleted and not recoverable by the base station, leading to potential data loss during handovers from relay nodes to base stations within or between cells.
Innovation Solution
A method where the first instance (user terminal) issues a status report directly to the second instance (base station) via a third instance (relay node), allowing immediate status update post-handover, and enabling flow control by adjusting the buffering status based on relay node and user terminal status reports, thereby preventing data loss and maintaining efficient error recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If per-hop RLC operation is implemented at relay nodes for fast local error recovery, then error recovery speed is improved, but data loss occurs during handover from relay node to base station
Solution Approach 1:
The base station stores buffered data before handover occurs, preparing in advance for potential data loss. This preliminary action ensures that when handover from relay node to base station occurs, the base station already has the necessary data to continue transmission without loss, resolving the contradiction between fast local error recovery and data loss prevention.
Solution Approach 2:
The base station acts as an intermediary that receives and stores data from the relay node before handover. This intermediary buffering mechanism allows the relay node to perform fast local error recovery while the base station maintains a backup copy, ensuring data continuity during handover and preventing data loss.
2Stability of the object's composition
If status report is transmitted via relay node during handover, then protocol consistency is maintained, but transmission time increases
Solution Approach 1:
The user terminal prepares and sends the status report to the base station before the handover is completed. This preliminary action ensures that the base station receives the status report in advance, maintaining protocol consistency while minimizing the time loss during handover, as the status report is already available when needed.
Data Source
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AI summary
A method and a device are provided for data communication between a first instance and a second instance, the method comprising the step of: The first instance issues a first status report to the second instance either via a third instance or directly.