PDCP Status Report Triggering for 5G DRB and MRB Switching
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in efficiently managing PDCP status reports, especially during dynamic switching between PTP and PTM transmission schemes, which can lead to packet loss and reliability issues.
Innovation Solution
A method and device for triggering PDCP status reports in user equipment (UE) by receiving DRB and MRB configurations from the network, and independently triggering status reports based on specific configurations of the first and second PDCP entities associated with these configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic switching between PTP and PTM transmission schemes is implemented, then transmission flexibility and adaptability are improved, but packet loss and reliability deteriorate due to improper PDCP status report management
Solution Approach 1:
The patent segments the PDCP status report triggering mechanism into distinct conditions for different transmission modes. Separate triggering conditions are defined for PTP mode (based on PDCP SDU reception status) and PTM mode (based on PDCP status indication), allowing each mode to be managed independently and preventing packet loss during dynamic switching between modes.
Solution Approach 2:
The patent implements dynamic triggering of PDCP status reports based on the current transmission mode and reception status. The system adapts the triggering behavior dynamically - in PTP mode it triggers on missing PDCP SDUs, while in PTM mode it triggers on PDCP status indications, ensuring reliable operation during dynamic switching between transmission schemes.
2Reliability
If PDCP status reports are triggered frequently to ensure reliability, then packet loss is reduced, but signaling overhead and network processing complexity increase
Solution Approach 1:
The patent implements feedback mechanisms where the UE reports missing PDCP SDUs or PDCP status indications to the network based on configured triggering conditions. This selective feedback approach ensures reliability by reporting only when necessary (when packets are missing or status changes occur) rather than continuous reporting, thereby reducing signaling overhead.
Solution Approach 2:
The patent changes the triggering parameters based on the transmission mode and reception status. Instead of uniform frequent triggering, the system adjusts triggering parameters dynamically - using PDCP SDU reception status for PTP mode and PDCP status indication for PTM mode - which reduces unnecessary signaling while maintaining reliability.
3Productivity
If separate PDCP entities are configured for DRB and MRB, then transmission optimization is improved, but configuration complexity and management overhead increase
Solution Approach 1:
The patent segments the PDCP layer into separate entities for DRB and MRB, allowing independent configuration and optimization of each bearer type. This segmentation enables mode-specific optimization (PTP for unicast DRB, PTM for multicast MRB) while the patent provides structured triggering conditions that manage the complexity of having multiple entities.
Solution Approach 2:
The patent creates a universal PDCP status report triggering mechanism that works for both DRB and MRB entities. By defining triggering conditions that apply to both types of entities (based on their respective transmission modes and reception status), the system achieves multi-functionality without proportionally increasing configuration complexity.
Data Source
AI summary
A method of triggering a packet data convergence protocol (PDCP) status report performed by a user equipment (UE) is provided. The method includes receiving, from a network, a Data Radio Bearer (DRB) configuration that is associated with a first PDCP entity of the UE; receiving, from the network, a Multicast Broadcast Service Radio Bearer (MRB) configuration that is associated with a second PDCP entity of the UE; triggering, by the first PDCP entity, a first PDCP status report based on a first configuration of the first PDCP entity; and triggering, by the second PDCP entity, a second PDCP status report based on a second configuration of the second PDCP entity.