Data Duplication Handling in Mobile Communications
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Solution Overview
Problem
In mobile communications, data duplication over multiple links improves reliability but increases resource usage, leading to inefficiencies and potential delays in asymmetric transmission scenarios, which are problematic for low-latency and high-reliability requirements.
Innovation Solution
Implementing a mechanism where user equipment (UE) generates and transmits protocol data units (PDUs) on multiple links, with the ability to discard duplicated PDUs based on acknowledgement feedback and timer or sliding window mechanisms to manage resource usage and prevent backlog, thereby optimizing resource efficiency and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data is transmitted over multiple links with duplication, then transmission reliability is improved, but resource usage increases
Solution Approach 1:
The patent implements a mechanism where duplicated PDUs are conditionally discarded based on acknowledgment feedback. When the first PDU is successfully transmitted and acknowledged on one link, the corresponding duplicated PDU on the other link is discarded, preventing unnecessary resource consumption while maintaining transmission reliability through selective redundancy.
Solution Approach 2:
The patent introduces dynamic control of data duplication by using acknowledgment feedback to adaptively determine whether to transmit or discard duplicated PDUs. This dynamic mechanism allows the system to adjust resource allocation based on actual transmission outcomes, optimizing the balance between reliability and resource efficiency.
2Reliability
If data duplication is implemented over multiple links, then transmission reliability improves, but transmission delay increases
Solution Approach 1:
The patent eliminates unnecessary delays by discarding duplicated PDUs that are no longer needed after successful transmission on one link. This prevents the system from waiting for potential retransmissions on multiple links, thereby reducing transmission delay while maintaining reliability through selective duplication.
Solution Approach 2:
The patent uses acknowledgment feedback from the receiver to control the transmission and discarding of duplicated PDUs. This feedback mechanism enables the system to make informed decisions about whether to continue transmitting duplicated data, optimizing the trade-off between reliability and transmission delay by stopping unnecessary transmissions early.
3Reliability
If duplicated PDUs are transmitted on multiple links, then data reception reliability improves, but resource efficiency deteriorates
Solution Approach 1:
The patent improves resource efficiency by implementing a discard mechanism for duplicated PDUs based on transmission acknowledgments. When a PDU is successfully transmitted and acknowledged on one link, the corresponding duplicate is discarded, eliminating wasteful resource consumption while preserving data reception reliability through conditional redundancy.
Solution Approach 2:
The patent changes the transmission parameter of duplicated PDUs from a static always-transmit approach to a dynamic condition-based approach. By using acknowledgment status as a parameter to control whether duplicates are transmitted or discarded, the system optimizes resource efficiency while maintaining the reliability benefits of duplication when needed.
Data Source
AI summary
Various solutions for handling data duplication with respect to user equipment and network apparatus in mobile communications are described. An apparatus may establish a first link and a second link with a network. The apparatus may generate a first protocol data unit (PDU) to transmit on the first link. The apparatus may generate a second PDU to transmit on the second link. The apparatus may transmit the first PDU on the first link. The apparatus may determine whether to discard the second PDU according to a condition. The second PDU may be duplicated from the first PDU.