PDCP Packet Discarding for XR Logical Channel Prioritization
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Solution Overview
Problem
There is a need to enhance packet discarding procedures and logical channel prioritization in wireless communication systems, particularly for supporting high-data-rate applications like extended reality (XR), to improve system efficiency and performance.
Innovation Solution
A method and system for enhanced packet discarding and logical channel prioritization are introduced, involving the application of application frame discarding based on discard timers for data radio bearers associated with XR applications, utilizing the packet data convergence protocol (PDCP) layer to manage PDCP service data units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional packet discarding procedures are used, then system complexity is reduced, but performance for high-data-rate applications like XR is insufficient
Solution Approach 1:
The patent segments the packet discarding mechanism into multiple layers: PDCP layer discard timers for individual packets, RLC layer discard timers for retransmission control, and application-layer frame-based discarding for XR traffic. This segmentation allows each layer to handle discarding independently based on its specific requirements, improving overall reliability without requiring a single complex centralized mechanism.
Solution Approach 2:
The patent implements preliminary discarding actions by setting discard timers at the PDCP layer before packets are transmitted. When the timer expires, packets are discarded proactively rather than waiting for transmission failures. This preliminary action prevents wasted retransmission attempts and reduces latency for time-sensitive XR applications.
2Reliability
If discard timers are applied at PDCP layer, then packet delivery reliability is improved, but processing complexity increases
Solution Approach 1:
The patent applies local quality by configuring discard timers selectively at the PDCP layer based on traffic type and QoS requirements. Not all bearers or packets receive the same discarding treatment - instead, discard timers are applied locally to specific PDCP entities handling XR or real-time traffic, while other traffic flows use traditional mechanisms. This reduces overall processing complexity by avoiding universal complex handling.
3Productivity
If application frame discarding is implemented, then system efficiency for XR applications is improved, but implementation complexity increases
Solution Approach 1:
The patent introduces an intermediary mechanism at the RLC layer that mediates between the PDCP layer's packet-level discarding and the application layer's frame-level requirements. The RLC layer aggregates PDCP packets into RLC PDUs and applies its own discard timers, acting as an intermediary that simplifies the implementation burden on both PDCP and application layers while maintaining frame-based discarding efficiency for XR traffic.
Solution Approach 2:
The patent implements dynamic discard timer configuration where timer values and discarding behavior adapt based on traffic characteristics, QoS parameters, and network conditions. For XR applications, discard timers are dynamically adjusted based on frame timing requirements and buffer status, allowing the system to optimize performance without requiring static complex configuration for all scenarios.
4Reliability
If multiple discard timers are configured for different layers, then packet handling reliability is improved, but configuration complexity increases
Solution Approach 1:
The patent applies universality by using the same discard timer mechanism across multiple layers (PDCP, RLC, and application layer) with consistent timing principles. Rather than implementing fundamentally different discarding mechanisms at each layer, the same timer-based approach is used universally, allowing configuration parameters to be standardized and managed through common procedures, thereby reducing overall configuration complexity despite multi-layer implementation.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. Specifically, the present disclosure provides a method and an apparatus for enhanced packet discarding. Also, the present disclosure provides a method and an apparatus for logical channel prioritization.