RLC Entity Packet Discarding for PDCP Duplication
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Solution Overview
Problem
Current multicarrier communication systems face challenges in efficiently managing packet duplication and resource allocation across multiple carriers, leading to suboptimal performance in terms of reliability and latency, particularly in scenarios requiring ultra-reliable low-latency communications.
Innovation Solution
The implementation of packet duplication mechanisms within the PDCP layer, combined with MAC layer multiplexing and HARQ processes across multiple carriers, enables coordinated transmission and reception of duplicate packets to enhance reliability and latency performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If packet duplication is implemented across multiple carriers, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments the packet duplication management by introducing separate RLC entities for different carriers, with each RLC entity independently managing its own packets. This segmentation allows the system to achieve high reliability through diverse transmission paths while maintaining manageable complexity at each segment, as each RLC entity operates independently with its own buffer and transmission control.
Solution Approach 2:
The patent introduces an intermediary mechanism at the RLC layer that receives packets from the PDCP layer and distributes them to multiple RLC entities corresponding to different carriers. This intermediary layer abstracts the complexity of multi-carrier management, allowing the upper layers to benefit from enhanced reliability without directly handling the complexity of multiple transmission paths.
2Reliability
If duplicate packets are transmitted across multiple carriers, then reliability is improved, but loss of time increases due to duplicate packet removal processing
Solution Approach 1:
The patent applies preliminary action by having each RLC entity independently track and manage its own transmitted packets, maintaining separate transmission status information for each carrier. This preliminary organization of packet status information enables the receiver to quickly identify and remove duplicates by comparing against pre-established transmission records, significantly reducing the time required for duplicate packet removal compared to centralized tracking approaches.
3Reliability
If independent HARQ operations are implemented across carriers, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments HARQ operations by associating each carrier with its own independent HARQ process and RLC entity. Each HARQ process operates autonomously with its own buffer and retransmission control, enabling parallel error correction operations across multiple carriers. This segmentation improves reliability through diverse error correction paths while keeping each HARQ process manageable in size and complexity.
Data Source
AI summary
A wireless device receives an indication for activation of packet data convergence protocol (PDCP) packet duplication of a radio bearer associated with a first radio link control (RLC) entity and a second RLC entity. A packet of the radio bearer is duplicated. The packet to the first RLC entity is provided. A duplicate packet to the second RLC is provided. The packet of the first RLC entity is transmitted. An acknowledgement of a successful delivery for the packet of the first RLC entity is received. In response to the acknowledgement, the duplicate packet of the second RLC entity is discarded.