Radio Link Failure Processing via Single-BS Carrier Aggregation
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Solution Overview
Problem
Current mobile communication systems, particularly in 5G networks, lack efficient methods for duplicate data transmission and radio link failure processing using single-BS-based carrier aggregation, which hinders reliable and low-latency data transmission.
Innovation Solution
A method and apparatus for configuring carrier aggregation using multiple cells to perform duplicate data transmission and reception, and processing radio link failures by transmitting secondary cell failure reports without performing RRC re-establishment procedures, allowing for efficient handling of failures during duplicate transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If duplicate data transmission is performed via multiple cells using carrier aggregation, then data transmission reliability is improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent segments the data transmission path by configuring separate logical channels and RLC entities for duplicate transmission via different cells. Each RLC entity handles specific data flows independently, allowing the system to maintain high reliability through redundancy while managing complexity through structured division of transmission paths
Solution Approach 2:
The patent implements a universal failure processing mechanism that handles both cell-specific failures and RLC entity failures through a unified secondary cell failure report procedure. This multi-functional approach allows the same reporting mechanism to serve multiple purposes: detecting SCell failures, identifying RLC entity failures, and triggering appropriate recovery actions without requiring separate complex procedures
2Reliability
If RRC re-establishment procedure is performed upon radio link failure, then connection reliability is improved, but transmission latency increases
Solution Approach 1:
The patent performs preliminary configuration of multiple RLC entities and logical channels for duplicate transmission before failures occur. This advance preparation ensures that when a failure happens, the system can immediately switch to the pre-configured backup path without requiring time-consuming re-establishment procedures, thus reducing latency while maintaining reliability
Solution Approach 2:
The patent enables the system to skip the lengthy RRC re-establishment procedure by detecting RLC entity failures and directly triggering secondary cell failure reports. This allows the system to rush through the failure recovery process by bypassing unnecessary procedural steps and directly activating pre-configured backup transmission paths
3Reliability
If duplicate transmission is configured without specific failure processing methods, then data redundancy is improved, but unnecessary operations and resource waste increase
Solution Approach 1:
The patent implements a feedback mechanism through secondary cell failure reports that provide real-time information about the status of duplicate transmission paths. This feedback allows the system to dynamically adjust resource allocation, maintaining data redundancy through duplicate transmission while avoiding unnecessary operations by stopping transmissions on failed paths and reallocating resources efficiently
Data Source
AI summary
Provided are a method and an apparatus for processing a Radio Link Failure (RLF) when duplicate data transmission is performed via single-BS-based CA. The method of processing an RLF by a user equipment (UE) may include: receiving, from a Base Station (BS), higher layer signaling including information for configuring duplicate data transmission via single BS-based CA; configuring a logical channel restricted to one or more secondary cells and a Radio Link Control (RLC) entity for duplicate transmission, based on the higher layer signaling; and transmitting, to the BS, a secondary cell failure report without performing RRC re-establishment procedure, when an RLF occurs in the RLC entity.