Multi-Link Scheduling for Low-Latency Wireless Streams
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Solution Overview
Problem
Existing Multi-Link Operation (MLO) in wireless communication systems does not guarantee low latency and reliability for latency-sensitive streams, as the current trigger-based transmission mechanisms do not account for the specific latency, reliability, or jitter requirements of Low Latency Reliable Services (LLRS) traffic.
Innovation Solution
Implementing improved Stream Classification Service (SCS) mechanisms to identify low latency streams with a SCSID, allowing stations to report link preferences and negotiate link sets for transmission, and adapting Target Wake Time (TWT) service periods for dedicated low latency streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If trigger-based transmission mechanisms are used in Multi-Link Operation, then data throughput is improved, but latency guarantee and reliability for latency-sensitive streams deteriorate
Solution Approach 1:
The patent segments traffic into different categories using Stream Classification Service (SCS) identifiers, separating latency-sensitive streams from other traffic. This allows differentiated handling where latency-sensitive traffic receives priority scheduling and resource allocation, while maintaining high throughput for overall data transmission through multi-link aggregation.
Solution Approach 2:
The patent applies local quality by providing specialized transmission mechanisms for specific traffic types. Latency-sensitive streams receive dedicated resource allocation, priority scheduling, and optimized link selection, while non-latency-sensitive traffic uses standard trigger-based transmission. This localized optimization ensures reliability for critical streams without sacrificing overall system throughput.
2Device complexity
If link-agnostic MAC procedures are used for buffering data, then device complexity is reduced, but transmission reliability and latency control for specific traffic streams deteriorate
Solution Approach 1:
The patent introduces link-aware buffering and scheduling mechanisms specifically for latency-sensitive streams while maintaining link-agnostic procedures for other traffic. The MAC layer implements differentiated buffering where latency-sensitive data is separated and assigned priority queues, enabling reliable transmission with controlled latency without significantly increasing overall device complexity.
Solution Approach 2:
The patent changes MAC layer parameters dynamically based on traffic type. For latency-sensitive streams, the system adjusts buffering priorities, scheduling intervals, and link selection parameters, while maintaining standard parameters for non-latency-sensitive traffic. This selective parameter adjustment ensures transmission reliability for critical streams without complicating the overall MAC procedure.
3Productivity
If multiple concurrent communication links are established, then data throughput is improved, but management complexity and scheduling difficulty for latency-sensitive streams increase
Solution Approach 1:
The patent applies link-aware scheduling and resource allocation specifically for latency-sensitive streams across multiple concurrent links. The system identifies preferred links for latency-sensitive traffic based on current link conditions, historical performance, and QoS requirements, while allowing more flexible link selection for non-latency-sensitive traffic. This differentiated approach manages multi-link complexity while ensuring reliable low-latency transmission.
Solution Approach 2:
The patent implements feedback mechanisms where the system continuously monitors link performance metrics (latency, throughput, packet loss) and adjusts resource allocation and link selection for latency-sensitive streams accordingly. This closed-loop control enables automatic optimization of multi-link usage for latency-sensitive traffic without requiring complex manual configuration or management.
Data Source
AI summary
Known stream classification service (SCS) has been improved for multi-link support. The low latency streams are identified with a SCSID. Improved SCS mechanisms may be used to allow a station to report link preference associated with low latency streams. Adapted SCS may also be used for negotiating a set of link for transmission of the low latency streams. An amended trigger frame may be used by the AP for scheduling the low latency streams. It is also proposed to adapt the target wake time (TWT) service period for allowing low latency dedicated TWT periods adapted to transmit streams identified with a SCSID.