LTE RLF Handling by Cell Group Type for Uplink Reliability
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Solution Overview
Problem
Existing data transmission methods in LTE technologies face uplink data transmission failures due to radio link failures (RLF) in secondary cell groups (SCG), leading to reduced success rates, especially when configuration data or signaling is only transmitted in the SCG.
Innovation Solution
A data transmission method that determines the type of cell group corresponding to a protocol data unit (PDU) when RLF is triggered, allowing for different RLF operations, including reconfiguring or releasing radio resource control (RRC) connections and data bearers between master cell groups (MCG) and SCG to improve data transmission success rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data is transmitted only through SCG, then data transmission efficiency is improved, but transmission reliability deteriorates due to SCG faults
Solution Approach 1:
The patent applies local quality by differentiating the handling of cell groups based on their types. When RLF occurs in SCG, the terminal device identifies the PDU's cell group type and applies different RLF processing operations accordingly - suspending SCG bearers while maintaining MCG bearers for critical data, thereby optimizing transmission reliability for specific local contexts without affecting overall system efficiency
Solution Approach 2:
The patent segments the cell groups into first-type (MCG) and second-type (SCG) with distinct RLF processing operations. This segmentation allows independent handling of each cell group type when RLF occurs, enabling the system to maintain transmission through MCG while managing SCG separately, thus resolving the contradiction between efficiency and reliability
2Reliability
If maximum retransmission times are enforced, then transmission reliability is improved, but data loss increases due to RLF triggering
Solution Approach 1:
The patent implements preliminary action by pre-configuring different RLF processing operations for different cell group types before RLF occurs. When RLF is triggered, the terminal device can immediately apply the appropriate pre-determined operation based on the PDU's cell group type, avoiding data loss through proactive preparation of fallback mechanisms
Solution Approach 2:
The patent changes the parameter of RLF processing operations based on the cell group type parameter. Instead of a uniform RLF handling approach, the system dynamically adjusts the RLF processing operation according to whether the PDU belongs to MCG or SCG, thereby preventing information loss while maintaining reliability through parameter-based adaptation
Data Source
AI summary
A data transmission method includes: when the number of retransmission times of a protocol data unit (PDU) of a radio link control (RLC) layer is greater than or equal to a maximum number of retransmission times, and a radio link fault (RLF) is triggered, determining the type of a cell group corresponding to the PDU, wherein the cell group corresponding to the PDU includes a first-type cell group and/or a second-type cell group, and the type of the first-type cell group is different from the type of the second-type cell group; and processing the RLF according to the type of the cell group corresponding to the PDU.