Terminal Device RLF Handling via Bearer Replication Deactivation
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Solution Overview
Problem
Current technologies do not effectively address how a terminal device should handle a radio link failure (RLF) when the replication data transmission function of a radio bearer is active in carrier aggregation scenarios, impacting data transmission reliability.
Innovation Solution
A method where a terminal device deactivates the replication data transmission function of a first radio bearer and/or a second radio bearer when data reaches a maximum number of retransmissions, and sends indication information to the network, allowing data to be rerouted through alternative RLC entities with overlapping carriers, thereby improving data transmission reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the replication data transmission function is activated to improve reliability, then data transmission reliability is improved, but the complexity of handling radio link failure increases
Solution Approach 1:
The patent implements dynamic switching of replication data transmission function based on radio link status. When radio link failure is detected, the terminal device deactivates the replication function for affected radio bearers, and when recovery occurs, it can reactivate the function. This dynamic adaptation resolves the contradiction by adjusting system behavior to actual conditions.
Solution Approach 2:
The patent employs feedback mechanisms where the terminal device monitors transmission status and radio link conditions, then adjusts the replication function accordingly. The network device also receives feedback about deactivated bearers and can coordinate reactivation, creating a closed-loop control system that manages complexity while maintaining reliability.
2Reliability
If the replication data transmission function is deactivated during RLF, then data transmission reliability is improved through failover, but the loss of time for reconfiguration occurs
Solution Approach 1:
The patent prepares alternative transmission paths in advance by configuring multiple RLC entities and their associated radio bearers before failure occurs. When failure is detected, the system can immediately switch to pre-configured alternative bearers, minimizing reconfiguration time while ensuring reliable failover.
Solution Approach 2:
The patent ensures continuous data transmission by maintaining multiple active radio bearers with overlapping carriers. When one bearer fails, data transmission continues through alternative bearers without interruption, eliminating idle reconfiguration periods and maintaining uninterrupted useful action.
3Reliability
If multiple radio bearers with overlapping carriers are used, then data transmission reliability is improved, but the device complexity increases
Solution Approach 1:
The patent segments the data transmission function across multiple independent radio bearers, each with its own RLC entity and carrier resources. This segmentation allows independent management and failure isolation, where failure of one bearer does not affect others, improving reliability while organizing complexity into manageable units.
Solution Approach 2:
The patent creates radio bearers with overlapping carriers that can serve multiple purposes - primary data transmission and backup during failure. These multi-functional bearers improve reliability by providing both normal operation and failover capabilities, while the network coordinates their management to reduce overall system complexity.
Data Source
AI summary
Embodiments of the present application disclose a method for handling a radio link failure RLF and a terminal device. The method includes: in a case that data of a first radio bearer reaches a maximum number of retransmissions on a first radio link control RLC entity corresponding to the first radio bearer, deactivating, by a terminal device, a replication data transmission function of the first radio bearer, and/or, deactivating, by a terminal device, a replication data transmission function of a second radio bearer, where a carrier mapped by an RLC entity corresponding to the second radio bearer at least partially overlaps with a carrier mapped by the first RLC entity.