PDCP Entity Establishment for PDU Set QoS Differentiation
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Solution Overview
Problem
The existing QoS model based on QoS flow is inadequate for supporting the different QoS requirements of Protocol Data Unit (PDU) Sets in advanced media services like XR, leading to inefficient resource utilization and waste due to the inherent interdependence of packets within a PDU Set.
Innovation Solution
Implementing a packet data convergence protocol (PDCP) entity establishment method that maps sub QoS flows to data radio bearers (DRBs) and establishes corresponding PDCP entities, enabling QoS differentiation and ensuring consistency across PDU Sets with varying importance levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the existing QoS model based on QoS flow is used, then the network can handle general traffic, but it cannot support different QoS requirements of PDU Sets with varying importance levels
Solution Approach 1:
The patent segments the QoS flow into multiple sub-QoS flows, where each sub-QoS flow corresponds to a specific PDU Set with distinct importance levels. This segmentation enables differentiated QoS handling for different PDU Sets while maintaining the overall QoS flow structure, thus improving adaptability without excessive complexity increase.
Solution Approach 2:
The patent applies local quality by assigning different QoS characteristics to different sub-QoS flows within the same QoS flow. Each sub-QoS flow can have its own priority, packet loss rate, and other QoS parameters tailored to the specific importance level of the corresponding PDU Set, allowing localized QoS optimization.
2Loss of energy
If all packets in a PDU Set are treated equally, then the QoS model is simple, but resource waste occurs due to inability to differentiate important from less important packets
Solution Approach 1:
The patent segments packets into different sub-QoS flows based on their importance levels within a PDU Set. This allows the network to identify and prioritize important packets (e.g., key video frames) while allowing less important packets to be discarded under congestion, thereby reducing resource waste without requiring complex per-packet analysis.
Solution Approach 2:
The patent changes the QoS parameters (such as priority level, packet loss rate) for different sub-QoS flows based on the importance of the corresponding PDU Sets. This parameter differentiation enables the network to apply different handling strategies to different packet groups, optimizing resource utilization while maintaining manageable processing complexity.
3Adaptability or versatility
If sub QoS flows are mapped to separate DRBs, then QoS differentiation is achieved, but the number of PDCP entities increases leading to higher complexity
Solution Approach 1:
The patent merges multiple sub-QoS flows that correspond to the same DRB into a single PDCP entity. This allows QoS differentiation at the sub-QoS flow level while sharing the PDCP processing resources, thereby achieving adaptability without proportionally increasing the number of PDCP entities and their associated complexity.
Solution Approach 2:
The patent makes a single PDCP entity universal by enabling it to handle multiple sub-QoS flows within the same DRB. This multi-functionality allows the PDCP entity to apply different QoS policies to different sub-QoS flows while using a unified processing structure, reducing the overall number of PDCP entities needed.
Data Source
AI summary
An apparatus, configured in a terminal equipment for packet data convergence protocol (PDCP) entity establishment, includes: processor circuitry configured to map at least one group of Protocol Data Unit (PDU) Sets to at least one data radio bearer; and establish at least one corresponding packet data convergence protocol (PDCP) entity for the at least one data radio bearer, wherein the at least one packet data convergence protocol (PDCP) entity shares first information.