PDCP PDU Set Discard Handling to Reduce Reordering Delays
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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 transmission, particularly for XR and media services, leading to inefficient resource utilization and sequence number gaps.
Innovation Solution
Implementing a data processing apparatus that discards all PDCP SDUs and their corresponding PDUs for a PDU Set under specific conditions, and transmits sequence number information of discarded PDCP SDUs to the receiving device, ensuring integrity and reducing reordering delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If PDCP SDUs are discarded individually when their discard timers expire, then individual packet handling is achieved, but sequence number gaps occur and reordering delays increase
Solution Approach 1:
The patent merges the handling of multiple PDCP SDUs by discarding all SDUs belonging to a PDU Set when any one SDU's discard timer expires or when the PDU Set discard timer expires. This combining approach prevents sequence number gaps and reduces reordering delays at the receiving end, while still maintaining individual SDU tracking through the PDU Set structure.
Solution Approach 2:
The patent segments PDCP SDUs into PDU Sets with unified discard timers, allowing differentiated handling between sets while maintaining individual SDU identification. This segmentation enables the system to balance between individual packet handling and bulk discard efficiency, resolving the contradiction by organizing SDUs into manageable groups.
2Productivity
If all PDCP SDUs in a PDU Set are discarded when one SDU fails delivery confirmation, then resource utilization is optimized, but data integrity requirements may not be met
Solution Approach 1:
The patent implements dynamic discard decisions based on the PSII configuration. When PSII is enabled, the system maintains higher reliability by requiring all PDUs to be confirmed before discarding the PDU Set. When PSII is disabled, the system optimizes resource utilization by discarding the entire PDU Set upon first failure. This dynamic adaptation resolves the contradiction between productivity and reliability.
Solution Approach 2:
The patent changes the discard behavior parameter based on the PSII configuration state. The discard timer behavior and PDU Set handling parameters are adjusted dynamically according to whether PSII is configured, allowing the system to switch between reliability-oriented and efficiency-oriented modes as needed.
3Adaptability or versatility
If differentiated handling of PDU Sets is implemented, then service quality for XR and media services is improved, but system complexity increases
Solution Approach 1:
The patent implements a universal PDU Set handling mechanism that works across different service types (XR, media, etc.) through a unified discard timer and PSII configuration approach. This universal structure provides differentiated handling capabilities without requiring separate complex management systems for each service type, thus resolving the contradiction between adaptability and complexity.
Data Source
AI summary
A data processing apparatus, configured in a transmitting device, the transmitting device being a terminal equipment or a network device, includes: a receiving device; and a transmitter configured to, after the transmitting device discards PDCP SDUs, transmit sequence number information of discarded PDCP SDUs to the receiving device.