Wi-Fi Access Point Scheduling for Latency-Sensitive Restricted TWT
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Solution Overview
Problem
Existing wireless communication systems, particularly IEEE 802.11be, lack sufficient parameters in the traffic specification (TSPEC) element to support latency-sensitive traffic, necessitating improved mechanisms for restricted Target Wake Time (TWT) operations to ensure high reliability and predictable latency.
Innovation Solution
Introduce extended parameters for the TSPEC element and restricted TWT mechanisms, including maximum jitter, seamless links, and latency-sensitive traffic indicators, to manage and schedule latency-sensitive traffic streams effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard TSPEC parameters are used in IEEE 802.11be, then device complexity is reduced, but reliability for latency-sensitive traffic deteriorates due to insufficient parameters
Solution Approach 1:
The patent extends the TSPEC element by adding new parameters (Maximum Jitter, NumSeamlessLinks, MaxMSDUsPerInterval, TransmissionSelection, EarliestTransmitOffset, LatestTransmitOffset) to the existing standard parameters. This allows the system to maintain the original TSPEC structure while enhancing its capability to describe latency-sensitive traffic requirements, thereby improving reliability without completely redesigning the protocol
Solution Approach 2:
The patent segments the traffic specification into two parts: the original standard TSPEC parameters and the newly added extended parameters. This segmentation allows legacy devices to ignore the extended parameters while newer devices can utilize them for enhanced QoS, resolving the contradiction between reliability for latency-sensitive traffic and device complexity
2Manufacturing precision
If extended TSPEC parameters are added to support latency-sensitive traffic, then communication performance is improved, but device complexity increases
Solution Approach 1:
The patent enhances communication performance by introducing specific parameters for latency-sensitive traffic control: Maximum Jitter for delay variation control, EarliestTransmitOffset and LatestTransmitOffset for timing precision, and NumSeamlessLinks for redundancy. These parameter changes enable precise control over traffic transmission while maintaining backward compatibility
Solution Approach 2:
The patent makes the TSPEC element dynamic by allowing optional extended parameters that can be included or excluded based on traffic type. For latency-sensitive traffic, the extended parameters are activated to provide enhanced performance, while for standard traffic, only the basic parameters are used, thus adapting device complexity to actual needs
3Loss of time
If restricted TWT mechanism is implemented with extended parameters, then latency predictability is improved, but ease of operation deteriorates due to more complex setup procedures
Solution Approach 1:
The patent implements preliminary action by establishing Restricted TWT schedules in advance with pre-configured extended TSPEC parameters. The AP and STA negotiate and agree on TWT parameters (Maximum Jitter, TransmitOffset, MaxMSDUsPerInterval) before actual data transmission, ensuring latency predictability while automating the complex setup process to minimize operational burden
Solution Approach 2:
The patent incorporates feedback mechanisms where the AP monitors traffic patterns and QoS requirements, then adjusts TWT parameters dynamically. The extended parameters enable the system to provide feedback on latency performance and adjust scheduling accordingly, improving latency predictability while the automation reduces operational complexity
Data Source
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AI summary
An access point (AP), a station (STA), and a wireless communication method are provided. The wireless communication method includes determining, by an AP, a criterion for latency sensitive traffic and determining, by the AP, one or more traffic stream identifiers (TSIDs) for TS-based latency sensitive traffic comprising a TS with a particular traffic specification (TSPEC), wherein the TSPEC comprises extended parameters. The wireless communication method further includes setting up, by the AP, a restricted target wake time (TWT) for the one or more TSIDs. This can issues in the prior art, support a TS operation for latency sensitive traffic, provide good communication performance, and/or provide high reliability.