HQoS Service Flow Scheduling for Priority Bandwidth Reallocation
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Solution Overview
Problem
Existing service flow scheduling methods fail to meet the diverse service level requirements of different service flows, such as delay-sensitive and non-delay-sensitive services, due to mixing them into a single queue, leading to network congestion and suboptimal transmission quality.
Innovation Solution
Implement a hierarchical quality of service (HQoS) model to separately schedule service flows with different priorities, adjusting the transmission rate thresholds for lower-priority flows when higher-priority flows do not meet their service level requirements, ensuring preferential bandwidth allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If different service flows are mixed into one queue for scheduling, then the scheduling process is simple, but the service level requirements of different service flows cannot be met
Solution Approach 1:
The patent divides service flows into different priority queues (first queue for high-priority flows, second queue for low-priority flows) based on their service level requirements. This segmentation allows differential scheduling where high-priority flows receive preferential treatment while low-priority flows can be shaped or dropped when resources are constrained, thus meeting diverse service level requirements while maintaining manageable scheduling complexity.
2Productivity
If bandwidth resources are allocated to lower-priority service flows, then the data transmission rate of lower-priority flows is improved, but the transmission quality of higher-priority flows deteriorates
Solution Approach 1:
The patent implements dynamic bandwidth allocation where the transmission rate threshold for low-priority service flows is adjusted based on the current transmission quality of high-priority flows. When high-priority flow quality degrades below a threshold, the system dynamically reduces the transmission rate threshold for low-priority flows through traffic shaping, thereby reallocating bandwidth resources to maintain overall system reliability while maximizing productivity when conditions permit.
3Reliability
If traffic shaping is applied to lower-priority service flows, then the service level requirements of higher-priority flows are met, but the data transmission rate of lower-priority flows is reduced
Solution Approach 1:
The patent changes the transmission rate threshold parameter for low-priority service flows dynamically. When high-priority service level requirements are not met, the threshold is reduced to shape traffic and prioritize high-priority flows. When high-priority requirements are satisfied, the threshold is increased to allow lower-priority flows to utilize more bandwidth, thus balancing reliability and productivity based on real-time conditions.
Data Source
AI summary
A service flow scheduling method and apparatus, and a system. When transmission quality of a service flow with a higher priority does not meet a service level requirement corresponding to the service flow, a first network device adjusts, to a first threshold, a transmission rate threshold of an HQoS model for a service flow with a lower priority, where the first threshold is less than a current data transmission rate of the service flow with a lower priority. By performing traffic shaping on the service flow with a lower priority, a bandwidth resource of a downlink port of the first network device may give way to the service flow with a higher priority, to ensure that the service flow with a higher priority meets the service level requirement of the service flow with a higher priority.