PDCP Entity Activation Signaling for Data Duplication
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Solution Overview
Problem
Current data duplication and transmission technologies at the PDCP layer in communication systems are limited, as they can only support a maximum of 2 copies of PDCP PDUs and lack clear definitions for delivering duplicate data, failing to meet the reliability requirements of advanced communication systems.
Innovation Solution
A data transmission method that allows the PDCP entity to determine the number of copies of duplicated PDCP PDUs and select appropriate RLC entities for transmission, enabling the duplication and transmission of PDCP PDUs across multiple RLC entities, thereby enhancing reliability and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data duplication is limited to maximum 2 copies at PDCP layer, then device complexity is reduced, but reliability is insufficient for advanced communication requirements
Solution Approach 1:
The patent implements dynamic data duplication where the PDCP entity can flexibly determine the number of duplicate copies based on indication information from higher layers. The duplication is not fixed but can be activated or deactivated dynamically, allowing the system to adapt reliability and complexity levels according to actual communication conditions and requirements.
Solution Approach 2:
The patent segments the data transmission path by introducing multiple RLC entities (first RLC entity and second RLC entity) that can independently transmit duplicate PDCP PDUs. This segmentation allows different copies to traverse different transmission paths, improving reliability while keeping each individual path's complexity manageable.
2Ease of manufacture
If clear definitions for delivering duplicate data are not provided, then ease of operation is improved, but manufacturing precision of protocol implementation deteriorates
Solution Approach 1:
The patent establishes clear preliminary rules for duplicate data delivery: the PDCP entity determines the number of copies based on indication information, selects appropriate RLC entities for transmission, and defines specific delivery behaviors. These pre-established rules enable precise and consistent protocol implementation without requiring complex runtime decisions.
3Adaptability or versatility
If only 2 RLC entities are used for PDCP PDU transmission, then device complexity is reduced, but adaptability to diverse communication scenarios deteriorates
Solution Approach 1:
The patent introduces a second RLC entity that can serve multiple purposes: transmitting duplicate PDCP PDUs, providing alternative transmission paths, and enabling flexible adaptation to different communication scenarios. This multi-functional design allows the system to handle diverse requirements without proportionally increasing overall complexity.
Data Source
AI summary
A data transmission method and a communication device are provided. The method includes: determining, by a packet data convergence protocol (PDCP) entity, the number of copies of duplicated PDCP protocol data unit (PDU); determining, by the PDCP entity, a first radio link layer control protocol (RLC) entity transmitting the PDCP PDU according to indication information; and transmitting, by the PDCP entity, the PDCP PDU to the first RLC entity. According to the data transmission method and the communication device of the embodiments of the disclosure, data duplication and transmission at a PDCP layer may be implemented.