PDCP Duplication Control via Bitmap Indication
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Solution Overview
Problem
Existing data transmission methods in carrier aggregation scenarios lack flexibility in using the Packet Data Convergence Protocol (PDCP) duplication function, limiting the ability to dynamically control data duplication and transmission based on reliability requirements.
Innovation Solution
A method where a terminal device receives indication information from a network device to enable or disable data duplication and transmission functions for each Radio Bearer (RB), allowing for flexible data transmission by using bit maps to indicate which RBs support data duplication, enabling dynamic control of PDCP duplication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a default state of PDCP data duplication function is used for data transmission, then data transmission reliability is improved through duplication, but transmission flexibility is reduced
Solution Approach 1:
The patent applies dynamics by enabling the PDCP duplication function to be dynamically activated or deactivated based on service requirements. The network device can configure the terminal to activate duplication for specific services (e.g., URLLC) while keeping it inactive for other services, allowing the system to adapt its transmission reliability level dynamically rather than being stuck in a default state.
Solution Approach 2:
The patent changes the operational parameter of the PDCP duplication function from a fixed default state to a configurable state. By introducing service-based activation mechanisms, the system can adjust the duplication parameter (on/off) according to different service reliability requirements, thereby resolving the contradiction between maintaining reliability and achieving flexibility.
2Reliability
If data duplication is activated for all Radio Bearers, then transmission reliability is improved, but system complexity and resource consumption increase
Solution Approach 1:
The patent applies local quality by enabling data duplication selectively for specific Radio Bearers or specific services rather than uniformly for all RBs. The network device can configure the terminal to activate duplication only for certain RBs (e.g., those carrying URLLC traffic) while keeping it inactive for others, thereby reducing overall system complexity and resource consumption while maintaining reliability where needed.
Solution Approach 2:
The patent segments the data transmission system into different service types or RB categories, applying duplication only to the segments that require high reliability. This segmentation allows the system to manage complexity by handling different services differently, rather than applying a one-size-fits-all approach.
3Adaptability or versatility
If PDCP duplication is dynamically controlled per service, then transmission flexibility is improved, but control mechanism complexity increases
Solution Approach 1:
The patent introduces an intermediary control mechanism where the network device sends configuration information to the terminal device, which then activates or deactivates duplication based on service types. This intermediary approach allows flexible service-based control without requiring complex terminal-side decision-making, as the control logic resides in the network device that has global knowledge of service requirements.
Data Source
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AI summary
Disclosed in embodiments of the present application are a data transmission method, a terminal device, and a network device. The method comprises: a terminal device receive first indication information sent by a network device, the first indication information being used for indicating whether each RB in at least one radio bearer (RB) enables replicated-data transmission function; and the terminal device sends data to the network device according to the first indication information. The method, the terminal device and the network device in the embodiments of the present application help to improve the flexibility of data transmission.