PDCP Packet Duplication for Reliable, Low-Latency Radio Data
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Solution Overview
Problem
The increasing number of user equipments (UEs) requiring service and the amount of data transmission in limited radio resources necessitates a method for efficient uplink/downlink data and control information transmission in new radio communication systems, while reducing latency and supporting new radio access technology.
Innovation Solution
The implementation of packet duplication with PDCP (Packet Data Convergence Protocol) for efficient data transmission and reception, particularly in narrowband communication, reducing latency and enabling effective signal transmission in new radio access technology systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If packet duplication is implemented with PDCP for efficient data transmission, then reliability and throughput are improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent segments the data transmission process by separating the original PDCP PDU transmission from the duplicate transmission. The PDCP layer divides data into PDUs, which are then segmented into original and duplicate copies sent through different RLC entities. This segmentation allows independent processing of each copy while maintaining overall reliability.
Solution Approach 2:
The patent implements packet duplication by creating a copy of the PDCP PDU and transmitting it through a different RLC entity. The receiving end reconstructs the original data by selecting one of the received copies (original or duplicate), eliminating the need for complex error correction while improving reliability through redundant transmission paths.
2Reliability
If multiple RLC entities are configured for packet duplication, then data transmission reliability improves, but control signaling overhead and processing burden increase
Solution Approach 1:
The patent merges the configuration of multiple RLC entities under a single PDCP entity, allowing centralized control of packet duplication. The PDCP entity manages both the original and duplicate transmissions through a unified interface, reducing the need for separate control signaling for each RLC entity and simplifying the overall control structure.
3Reliability
If packet duplication is used for all data transmissions, then reliability improves, but resource efficiency and latency increase due to redundant transmissions
Solution Approach 1:
The patent implements dynamic packet duplication where the duplication function is activated or deactivated based on transmission conditions. The system can switch between using one RLC entity or multiple RLC entities for data transmission, allowing optimization of latency when reliability requirements are lower and activation of duplication when higher reliability is needed.
Solution Approach 2:
The patent changes the operational parameters of the PDCP entity by enabling or disabling the packet duplication function. When duplication is disabled, only the original PDCP PDU is transmitted through a single RLC entity, reducing latency and resource consumption. When enabled, duplicate PDUs are transmitted through additional RLC entities to improve reliability.
Data Source
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AI summary
In the present invention, if a transmitting device receives an activation command for a packet duplication function of a PDCP entity for a radio bearer (RB), the PDCP entity submits a PDCP protocol data unit (PDU) to each of multiple lower layer entities associated with the PDCP entity, and each of the multiple lower layer entities transmits the PDCP PDU. If the transmitting device receives a deactivation command for the packet duplication function, the PDCP entity submits the PDCP PDU to a single one of the multiple lower layer entities, and the single one of the multiple lower layer entities transmits the PDCP PDU.