Wireless Congestion Detection Using Early ECN Marking
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Solution Overview
Problem
Current L4S technology for congestion detection in wireless networks is limited by delayed ECN marking at the end of queues, which can lead to increased latency and inefficiencies in managing network congestion, particularly in dynamic wireless environments like 5G networks.
Innovation Solution
Implementing congestion detection mechanisms at various protocol layers (SDAP, PDCP, RLC, MAC) to identify congestion early and provide CE indications through ECN/L4S fields, allowing for faster adjustment of application bit rates and improved queue utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ECN marking is performed at the end of queues in current L4S technology, then congestion detection is achieved, but latency increases and detection timing is delayed
Solution Approach 1:
The patent applies preliminary action by performing ECN marking at the head of the queue before packets are processed and transmitted, rather than at the end of the queue after processing. This allows congestion detection to occur earlier in the packet flow, reducing the time packets spend in the queue and thereby reducing latency while improving congestion detection timing precision.
2Productivity
If congestion detection is implemented at multiple protocol layers, then congestion management efficiency improves, but device complexity increases
Solution Approach 1:
The patent applies segmentation by implementing congestion detection and ECN marking at specific protocol layers (PDCP and RLC layers in the radio protocol stack) rather than uniformly across all layers. This segmented approach allows congestion management to be targeted at the layers where it is most needed, improving efficiency while avoiding unnecessary complexity in other layers.
Solution Approach 2:
The patent applies local quality by enabling congestion detection functionality selectively at different protocol layers based on their specific roles and requirements. The PDCP layer handles congestion detection for user plane data, while the RLC layer handles retransmission-related congestion, allowing each layer to have the appropriate level of congestion management capability without uniform complexity across all layers.
Data Source
AI summary
The present application relates to devices and components including apparatus, systems, and methods for detecting congestion in wireless networks.