NR Sidelink PDCP Duplication Control for Reliable SLRB Transmission
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Solution Overview
Problem
The challenge in existing communication systems is the lack of support for PDCP duplication in NR sidelinks, which affects the reliability and delay of data packet transmission, as NR sidelinks lack independent PPPR attributes for QoS management.
Innovation Solution
A method and terminal implementation that configures, activates, or deactivates PDCP duplication for sidelink radio bearers (SLRBs) based on granularities such as SLRB, destination address, link, RLC bearer, or entity, using messages like RRC, MAC CE, or DCI to enhance data packet transmission reliability and reduce retransmission delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDCP duplication function is not supported in NR sidelink, then the system complexity remains low, but the transmission reliability and delay performance deteriorate
Solution Approach 1:
The patent segments the PDCP duplication configuration into multiple granularities: SLRB-level configuration, destination address-level configuration, and link-level configuration. This allows the system to enable PDCP duplication functionality without requiring complete reconfiguration of the entire system, thus improving reliability while managing complexity through modular configuration approaches.
Solution Approach 2:
The patent introduces dynamic activation and deactivation mechanisms for PDCP duplication based on different granularities. The network can dynamically configure, activate, or deactivate PDCP duplication for specific SLRBs, destination addresses, or links based on current transmission requirements, allowing the system to adapt reliability settings without permanently increasing complexity.
2Reliability
If PDCP duplication is configured for all SLRBs, then transmission reliability improves, but the configuration overhead and signaling complexity increase
Solution Approach 1:
The patent enables PDCP duplication configuration at specific locations rather than globally: individual SLRBs, specific destination addresses, or particular links can have PDCP duplication enabled independently. This local quality approach allows reliability improvements where needed without generating configuration messages for all SLRBs, thus reducing overall configuration overhead.
Solution Approach 2:
Instead of configuring PDCP duplication for all SLRBs unconditionally, the patent applies partial action by enabling it only for specific SLRBs, destination addresses, or links that require enhanced reliability. This selective configuration reduces the quantity of configuration messages while still achieving reliability improvements where necessary.
Data Source
AI summary
The embodiments of the present application disclose a PDCP duplication configuring, activating, or deactivating method and a terminal. The method includes: receiving, by a terminal, a first message, where the first message is used to configure, activate, or deactivate PDCP duplication for a sidelink radio bearer SLRB of the terminal based on at least one of the following granularities: an SLRB, a destination address, a link, a radio link control RLC bearer or entity, and a terminal.