PDCP Duplication Carrier Switching Across RLC Entities
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Solution Overview
Problem
In new radio (NR) systems, the data duplication function of the packet data convergence protocol (PDCP) faces challenges with insufficient carriers when multiple logical channels are configured, leading to inefficiencies in data transmission performance, particularly during the deactivation of the duplicated-data transmission function.
Innovation Solution
The terminal device determines a target RLC entity and carrier for subsequent PDCP PDU transmission, instructing other RLC entities to discard duplicated data, thereby optimizing data transmission reliability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data transmission switches from 5G to 4G network, then data transmission can be established, but data transmission performance deteriorates due to lower priority and higher latency
Solution Approach 1:
The patent applies dynamics by making the RLC entity selection adaptive and flexible. The terminal device dynamically selects between first and second RLC entities based on real-time transmission conditions, allowing the system to transition between 5G and 4G networks while optimizing performance. This dynamic adaptation resolves the contradiction by enabling availability through network switching while maintaining performance through intelligent selection.
Solution Approach 2:
The patent changes the parameter of RLC entity selection criteria. Instead of using fixed selection rules, the system evaluates multiple parameters including transmission success rates, latency, and network conditions to dynamically determine which RLC entity to use. This parameter-based approach allows the system to maintain high performance even when switching between network generations.
2Reliability
If data transmission switches from 5G to 4G network, then data transmission can be established, but transmission latency increases
Solution Approach 1:
The system dynamically adjusts the RLC entity selection based on real-time transmission conditions and historical performance data. By continuously monitoring transmission success rates and latency, the system can identify when to switch between 5G and 4G networks while minimizing latency impact through proactive selection of optimal RLC entities.
Solution Approach 2:
The patent implements preliminary action by pre-establishing multiple RLC entities with different characteristics before actual data transmission occurs. The system evaluates and selects the most appropriate RLC entity in advance, preparing transmission paths that optimize latency performance even before the actual data flow begins.
3Reliability
If data transmission fails in 5G network, then retransmission can be attempted, but transmission efficiency decreases due to repeated failures
Solution Approach 1:
The patent implements feedback mechanisms where the terminal device monitors transmission success rates and uses this information to adjust RLC entity selection. The system learns from previous transmission outcomes and adapts its selection criteria accordingly, preventing repeated failures by identifying and avoiding problematic RLC entities or network conditions.
Solution Approach 2:
The system performs self-service by autonomously evaluating transmission conditions and making intelligent RLC entity selections without requiring manual intervention. The terminal device independently monitors performance metrics and adjusts its transmission strategy based on real-time feedback, improving overall efficiency while maintaining high success rates.
Data Source
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AI summary
A method for data transmission and a terminal device which can improve data transmission performance are provided. The method includes the following. The terminal device determines to change an RLC entity for transmitting a PDCP PDU, and determines a target RLC entity for transmitting the PDCP PDU and/or a target carrier used by a logical channel of the target RLC entity.