PDCP PDU Set Discard Timing for XR Data Congestion Control
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Solution Overview
Problem
Existing technologies lack standardized methods for integrated and differentiated handling of PDU Sets in downlink and uplink data transmissions, particularly for XR and media services, leading to inefficient resource utilization and potential data loss.
Innovation Solution
Implementing a discard timer at the PDCP layer for PDU Sets, with duration based on PDU Set-specific parameters such as PSDB and PDU Set Importance, and performing PDU Set discarding based on buffer status and latency criteria to manage data transmission effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PDU Sets are transmitted without standardized handling methods, then data transmission flexibility is maintained, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent segments PDU handling into two distinct modes: integrated handling for PDU Sets requiring all PDUs (e.g., video frames) and differentiated handling for PDU Sets where some PDUs can be discarded. This segmentation allows optimized resource utilization for each type without requiring complex universal handling mechanisms.
Solution Approach 2:
The patent introduces configurable parameters including discard timer duration, buffer status thresholds, and PDU Set importance levels. These parameters can be adjusted to balance resource utilization efficiency against handling complexity based on specific service requirements and network conditions.
2Reliability
If all PDUs in a PDU Set are retained for potential recovery, then data reliability is improved, but buffer memory consumption increases
Solution Approach 1:
The patent implements a discard timer mechanism that automatically discards PDUs after a predetermined duration, replacing indefinite retention with time-bounded storage. This allows the system to recover from losses within the timer window while preventing unbounded buffer growth.
Solution Approach 2:
The patent performs preliminary assessment of PDU Set characteristics and importance levels before transmission, pre-determining which PDUs should be retained and which can be discarded. This preliminary action prevents unnecessary buffer consumption for non-critical data.
3Reliability
If PDU transmission delay is increased to allow for retransmission attempts, then data delivery reliability is improved, but latency increases
Solution Approach 1:
The patent implements dynamic discard timer adjustment based on PDU Set importance levels and current buffer status. For high-importance PDU Sets, longer timers allow more retransmission attempts, while low-importance sets use shorter timers to minimize latency, creating a dynamic balance between reliability and timing.
Solution Approach 2:
The patent applies different quality of service treatments to different PDU Sets based on their importance and characteristics. Critical PDU Sets receive enhanced protection with longer retention and retransmission, while non-critical sets are handled more aggressively to reduce overall latency.
4Productivity
If buffer status monitoring is performed continuously, then data congestion is avoided, but processing overhead increases
Solution Approach 1:
The patent implements periodic buffer status monitoring at defined intervals rather than continuous monitoring. This periodic approach maintains effective congestion avoidance while significantly reducing processing overhead and energy consumption compared to continuous monitoring.
Data Source
AI summary
A data processing apparatus, configured in a terminal equipment, includes: setting processor circuitry configured to set a discard timer duration for a protocol data unit (PDU) Set; and processor circuitry configured to discard a PDU Set corresponding to an expired discard timer at a packet data convergence protocol (PDCP) layer when a discard timer expires.