Duplicated Data Packets for Multi-Carrier Radio Link Failure Handling
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Solution Overview
Problem
Existing radio link failure (RLF) handling in communication systems does not adequately address scenarios where data packets are duplicately transmitted, leading to inefficiencies in RRC re-establishment processes.
Innovation Solution
A method for handling RLF by duplicating data packets and sending them on multiple carriers, with a terminal device sending duplicated data packets to a base station on two or more carriers, and utilizing RRC re-establishment processes to optimize RLF handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a terminal device sends duplicated data packets on multiple carriers to improve transmission reliability, then data transmission reliability is improved, but the complexity of RLF handling increases because existing RLF handling only considers single-carrier scenarios
Solution Approach 1:
The patent segments the RLF handling process into distinct scenarios: single-carrier RLF and multi-carrier RLF. For multi-carrier scenarios, it further segments the response based on whether the failed carrier is the anchor carrier or a non-anchor carrier, enabling targeted handling for each case rather than a uniform complex procedure
Solution Approach 2:
The patent establishes preliminary conditions and judgment criteria before RLF handling begins. The terminal device pre-configures knowledge about which carriers are anchor carriers and which are non-anchor carriers, and pre-establishes the decision logic for different RLF scenarios, so that when RLF occurs, the appropriate handling can be quickly selected without complex real-time analysis
2Reliability
If the terminal device performs RRC re-establishment process upon detecting RLF, then the radio link can be restored, but transmission delay increases due to the re-establishment overhead
Solution Approach 1:
The patent extracts the RRC re-establishment step from the mandatory RLF handling procedure for non-anchor carrier failures. When RLF occurs on a non-anchor carrier, the terminal device can skip the time-consuming RRC re-establishment process and directly notify the network device, significantly reducing transmission delay while still maintaining radio link functionality through alternative mechanisms
3Loss of time
If the terminal device notifies the network device of RLF on a non-anchor carrier without RRC re-establishment, then transmission delay is reduced, but the network device needs additional information to properly handle the notification
Solution Approach 1:
The patent applies different notification approaches based on the local characteristic of the failed carrier. For anchor carrier RLF, traditional RRC re-establishment with full information exchange is used. For non-anchor carrier RLF, a simplified notification mechanism is employed where the terminal device includes specific identification information in the uplink data to indicate the RLF condition, providing just enough information for the network device to understand and respond appropriately
Data Source
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AI summary
This application provides a method for handling a radio link failure, a terminal device, and a network device. The method includes: sending, by a terminal device, duplicated data packets to a network device on a first carrier and a second carrier; and sending, by the terminal device, RLF indication information to the network device when determining that an RLF event occurs on at least one of the first carrier and the second carrier, where the RLF indication information is used to indicate that the RLF event occurs on the first carrier, the second carrier, or the first carrier and the second carrier. The foregoing technical solution can optimize handling of the radio link failure.