PDCP Duplication Indication for Combined CA and DC Scenarios
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Solution Overview
Problem
The existing activation and deactivation mechanisms for PDCP in scenarios involving carrier aggregation (CA) and dual connectivity (DC) are not suitable for scenarios where both CA and DC appear simultaneously, making it challenging to manage PDCP duplication effectively.
Innovation Solution
A method for indicating the state of PDCP duplication data is introduced, allowing a network device to generate and send indication information to a terminal device, enabling data transmission between a first PDCP entity and multiple RLC entities, thereby facilitating activation and deactivation of PDCP copies in scenarios with multiple PDCP copies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing activation and deactivation mechanisms for PDCP in CA and DC scenarios are used, then the mechanisms work separately for CA and DC, but they are not suitable for scenarios where both CA and DC appear simultaneously
Solution Approach 1:
The patent applies universality by designing a unified activation and deactivation mechanism that works across multiple scenarios (CA, DC, and combined CA+DC). The indication information structure is made universal to handle different PDCP copy configurations without requiring separate mechanisms for each scenario, allowing the same procedure to serve multiple functions.
Solution Approach 2:
The patent segments the indication information into specific fields (first indication information for first PDCP copy, second indication information for second PDCP copy) that can independently control activation and deactivation. This segmentation allows flexible combination of CA and DC scenarios while maintaining clear control over each PDCP copy's state.
2Reliability
If multiple PDCP copies are introduced to improve reliability, then data transmission reliability improves, but the complexity of managing activation and deactivation increases
Solution Approach 1:
The patent implements dynamics by enabling flexible and independent activation/deactivation of each PDCP copy through separate indication fields. The system can dynamically adjust the number of active PDCP copies based on network conditions, transitioning between one copy, two copies, or more without fixed constraints, thereby managing complexity through adaptive control.
Solution Approach 2:
The patent changes the parameter of indication information structure to accommodate multiple PDCP copies. By introducing specific indication fields that can be independently set for different PDCP copies, the system manages the complexity of multiple copies through structured parameter control rather than unstructured management.
3Adaptability or versatility
If activation and deactivation mechanisms are designed for two PDCP copies, then the mechanism works for basic duplication, but it cannot handle scenarios with more than two PDCP copies
Solution Approach 1:
The patent segments the indication information into distinct fields for each PDCP copy (first indication information for first copy, second indication information for second copy, etc.). This segmentation maintains precise control over each individual PDCP copy's activation and deactivation state, preventing loss of control precision even when supporting more than two copies.
Solution Approach 2:
The patent extends the indication mechanism into another dimension by adding multiple indication fields corresponding to different PDCP copies. This dimensional extension allows the system to manage an arbitrary number of PDCP copies while maintaining individual control, transforming a two-copy limitation into a scalable multi-copy solution.
Data Source
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AI summary
Provided in the embodiments of the present application are a method for indicating a state of PDCP duplicate data, a terminal device, and a network device. The method is applicable in the terminal device. The terminal device is provided with a first PDCP entity and multiple RLC entities corresponding to the first PDCP entity. The method comprises: the terminal device receives first indication information, the first indication information being used for indicating data actions between the first PDCP entity and the multiple RLC entities. In the embodiments of the present application, in a scenario of more than two PDCP copies (CA and DC appearing at the same time), the terminal device is still capable of making explicit the data actions between the first PDCP entity and each RLC entity of the multiple RLC entities, thus allowing the implementation of a way in which the multiple PDCP-corresponding RLC entities are to transmit data.