PDCP Data Duplication Handling in Carrier Aggregation
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Solution Overview
Problem
In data duplication scenarios within carrier aggregation and dual connectivity, there is a challenge in avoiding the retransmission of redundant data when data duplication is re-enabled after being disabled, particularly for data that are already in transmission or have been completed.
Innovation Solution
The PDCP entity in communication devices duplicates only new data when data duplication is re-enabled, avoiding the duplication of data that have been transmitted or are still being transmitted, and delivers the duplicated data to both RLC entities to prevent redundant data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data duplication is re-enabled after being disabled, then data transmission reliability is improved, but redundant data retransmission occurs
Solution Approach 1:
The PDCP entity checks the transmission status of data before duplicating when data duplication is re-enabled. By performing this preliminary check, the system avoids duplicating data that is already being transmitted or has been completed, thus preventing redundant retransmission while maintaining transmission reliability
Solution Approach 2:
The system uses feedback from the transmission status information to control the data duplication process. The PDCP entity receives feedback about which data are being transmitted or have been completed, and uses this feedback to decide whether to duplicate specific data packets, thereby avoiding redundant retransmission
2Reliability
If data duplication is re-enabled after being disabled, then data transmission reliability is improved, but transmission efficiency deteriorates
Solution Approach 1:
The PDCP entity performs a preliminary check of transmission status before duplicating data when data duplication is re-enabled. This preliminary action identifies which data need duplication and which do not, preventing wasted processing on redundant data and improving transmission efficiency while maintaining reliability
Solution Approach 2:
Instead of duplicating all data when data duplication is re-enabled, the system applies partial action by duplicating only those data packets that are neither being transmitted nor have been completed. This selective approach improves efficiency by avoiding unnecessary duplication operations while still ensuring reliability for data that needs it
Data Source
AI summary
A processing method under data duplication and related devices are provided, which are applied to a communication system. The communication system comprises a first communication device, and the first communication device comprises a PDCP entity. The method comprises: when data duplication is enabled, the PDCP entity of the first communication device duplicates target data, and the target data do not comprise data of which transmission have been completed and/or data that are being transmitted; and the PDCP entity of the first communication device delivers the duplicated target data to the RLC entity.