Flow Shaping Equipment for Delay-Critical Traffic
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Solution Overview
Problem
In packet-switched telecommunications, existing flow shaping systems fail to maintain service quality for delay-critical traffic flows when multiplexed with less critical flows, leading to increased transmission delays and potential exceedance of permitted speed limits.
Innovation Solution
The method involves updating VTS values for specific traffic flows without delaying packets, allowing the forwarding of packets from one flow to influence the forwarding timing of the other, ensuring that the speed properties of the aggregate flow are monitored and limited without delaying delay-critical traffic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flow shaping is performed by monitoring and limiting speed properties of aggregate traffic flows, then transmission capacity is reserved and speed limits are enforced, but delay-critical traffic flows experience increased transmission delays
Solution Approach 1:
The patent segments traffic flows into delay-critical and non-delay-critical categories, applying different shaping strategies to each segment. Delay-critical flows are excluded from aggregate shaping to prevent delays, while non-delay-critical flows are shaped to enforce speed limits, resolving the contradiction between reliability and time loss.
Solution Approach 2:
Different quality of service parameters are applied to different traffic segments. Delay-critical traffic receives guaranteed service quality with minimal delay, while non-delay-critical traffic is subject to speed limiting. This local differentiation resolves the contradiction by tailoring service quality to specific traffic requirements.
2Speed
If packets from different traffic flows are multiplexed with priority based on delay criticality, then delay-critical traffic is forwarded first, but the speed properties of aggregate flow cannot be effectively monitored and limited
Solution Approach 1:
The patent separates aggregate flow monitoring into two independent components: delay-critical flows that are forwarded with priority without aggregation monitoring, and non-delay-critical flows that are subject to aggregate speed monitoring. This segmentation enables both high-speed forwarding and effective speed property monitoring simultaneously.
Solution Approach 2:
The patent introduces an intermediary mechanism that tracks the cumulative transmission time of delay-critical flows separately, allowing the system to monitor aggregate speed properties of non-delay-critical flows without interfering with the high-speed forwarding of delay-critical traffic. This intermediary tracking resolves the contradiction between speed and monitoring reliability.
Data Source
AI summary
The invention relates to a method and equipment for performing flow shaping that maintains service quality in packet-switched telecommunications. Using the method according to the invention, the speed properties (OR, PIR, CBS) of an aggregate flow (A) can be monitored and limited in a situation, in which the aggregate flow contains delay-critical traffic (V1), the forwarding of packets representing which cannot be delayed. The invention is based on the fact that, when forwarding packets representing the aggregate flow, a variable is updated, the value of which expresses the earliest permitted moment, at which a packet, representing traffic (V2) other than the delay-critical traffic, can be forwarded. In that case, the transfer speed of the traffic (V2) other than delay-critical traffic adapts to the variations in the transfer speed of the delay-critical traffic, allowing the speed properties of the aggregate flow to be monitored and limited.