PDCP Entity Path Deactivation for Packet Loss Prevention
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Solution Overview
Problem
When a transmission path corresponding to a radio bearer (RB) is deactivated to improve resource utilization, the Packet Data Convergence Protocol (PDCP) indicates the Radio Link Control (RLC) entity to discard duplicated data packets. However, this leads to packet removal issues when the RB is configured with a PDCP data duplication function for more than two transmission paths, especially if the discarded data has no copy in an active transmission path.
Innovation Solution
A data processing method is implemented where the PDCP entity of a terminal determines which transmission paths need to be changed from an activated state to a deactivated state and indicates the RLC entity corresponding to those paths to discard duplicated data, ensuring that not all transmission paths are deactivated at once.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the PDCP entity indicates the RLC entity to discard duplicated data packets when a transmission path is deactivated, then resource utilization is improved, but packet removal occurs when the discarded data has no copy in active transmission paths
Solution Approach 1:
The patent applies preliminary action by checking whether active transmission paths still have copies of data packets before deactivating transmission paths. The PDCP entity determines which paths can be safely deactivated by verifying data redundancy in advance, preventing packet loss while optimizing resource usage.
Solution Approach 2:
The patent implements feedback mechanisms where the PDCP entity monitors the status of transmission paths and data packet copies. Based on this feedback information about which paths are active and whether they contain data copies, the system makes intelligent decisions about path deactivation to avoid packet removal.
2Loss of energy
If all transmission paths are deactivated to improve resource utilization, then energy consumption is reduced, but communication reliability is compromised
Solution Approach 1:
The system performs preliminary assessment of transmission path status and data redundancy before deactivation. By checking in advance whether data copies exist in remaining active paths, the system ensures that deactivation decisions maintain communication reliability while reducing energy consumption.
Solution Approach 2:
The patent applies partial action by deactivating only those transmission paths that are safe to deactivate (where data copies exist in other active paths). Rather than deactivating all paths or none, the system selectively deactivates specific paths based on real-time conditions, optimizing the balance between energy savings and reliability.
Data Source
AI summary
A data processing method includes: determining, by a PDCP entity of a terminal, at least one first transmission path corresponding to PDCP duplication that needs to be changed from an activated state to a deactivated state, from a transmission path set corresponding to PDCP duplication and including at least one transmission path currently in an activated state; and indicating, by the PDCP entity of the terminal, to a RLC entity corresponding to the first transmission path to discard duplicated data, in a case where the at least one first transmission path is not all transmission paths in the transmission path set. The transmission path set comprises at least one transmission path and a main transmission path.