Restricted TWT Session for Low-Latency Wireless Traffic
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Solution Overview
Problem
Existing wireless networks struggle to maintain low latency and high data throughput for latency-sensitive traffic, such as gaming traffic, due to contention on the wireless medium.
Innovation Solution
Establishing a restricted target wake time (TWT) session on a wireless medium for stations associated with latency-sensitive traffic, which includes restricted TWT service periods where only these stations can access the medium, indicated by a clear-to-send (CTS) frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a shared wireless communication medium is used for multiple stations, then the network can support multiple clients, but latency-sensitive traffic experiences unpredictable latency and packet loss due to medium contention
Solution Approach 1:
The wireless medium access is segmented into separate TWT service periods for latency-sensitive traffic and non-latency-sensitive traffic. The AP establishes restricted TWT sessions that create dedicated time windows for different traffic types, preventing contention between latency-sensitive and non-latency-sensitive stations. This segmentation allows the network to simultaneously support multiple clients while guaranteeing latency requirements for sensitive traffic.
2Productivity
If the wireless medium is shared among all stations, then resource utilization is maximized, but latency-sensitive applications cannot meet stringent end-to-end latency requirements
Solution Approach 1:
The AP performs preliminary actions by establishing restricted TWT sessions and scheduling TWT service periods in advance. Latency-sensitive stations are pre-configured with specific wake times and service periods where they can access the medium without contention. This preliminary scheduling ensures that when latency-sensitive traffic needs to transmit, the medium is already reserved for them, eliminating latency caused by contention with other stations.
3Device complexity
If contention-based medium access is used, then the system is simple to implement, but worst-case latency becomes unpredictable and excessive
Solution Approach 1:
The system dynamically switches between contention-based access for non-latency-sensitive traffic and scheduled restricted access for latency-sensitive traffic. The AP dynamically manages TWT session establishment, service period allocation, and medium access control based on traffic requirements. This dynamic approach maintains relative simplicity while providing deterministic latency guarantees when needed.
Data Source
AI summary
This disclosure provides systems, methods, and apparatuses for wireless communication that can be used to establish a restricted target wake time (TWT) session on a wireless medium. In some implementations, an access point (AP) establishes a restricted TWT session for one or more wireless stations (STAs) associated with latency sensitive traffic, the restricted TWT session including restricted TWT service periods (SPs) during which the AP reserves access to the wireless medium for only the one or more STAs associated with the latency sensitive traffic. The AP transmits a clear-to-send (CTS) frame at a start of each restricted TWT SP, the CTS frame indicating to other STAs that the wireless medium is unavailable for a duration of the respective restricted TWT SP. The AP transmits latency sensitive data to or receives latency sensitive data from the one or more STAs during at least one of the restricted TWT SPs.