Low-Latency WLAN Traffic Management With LLTI Signaling
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Solution Overview
Problem
Existing wireless local area networks (WLANs) face challenges in managing low latency traffic to meet maximum delay, priority, and jitter requirements for high priority traffic.
Innovation Solution
Implementing a method and apparatus for a station (STA) and access point (AP) to manage high priority traffic transmission in WLANs by exchanging frames with management information, including identification, mode, interval, backoff, and transmission opportunity details, and performing a backoff procedure if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If standard WLAN transmission protocols are used, then network simplicity is maintained, but latency requirements for high priority traffic cannot be met
Solution Approach 1:
The patent segments traffic into different priority categories (high priority and best effort traffic) and applies different transmission management mechanisms to each segment. High priority traffic receives specialized handling with reduced backoff periods and guaranteed transmission opportunities, while best effort traffic uses standard protocols, thus reducing latency for critical data without completely redesigning the entire network system.
Solution Approach 2:
The patent implements local quality by providing differentiated service parameters for different traffic types at the MAC layer. High priority traffic receives specific qualities such as reduced backoff periods, higher transmission opportunities, and priority in arbitration, while other traffic follows standard rules. This localized differentiation meets latency requirements for specific data streams without affecting overall network simplicity.
2Loss of time
If high priority traffic transmission is prioritized, then latency requirements are met, but transmission opportunities for other traffic are reduced
Solution Approach 1:
The patent applies partial prioritization by providing enhanced transmission opportunities for high priority traffic without completely blocking best effort traffic. The system uses modified backoff periods and transmission arbitration mechanisms that give high priority traffic advantages in certain contexts while still allowing other traffic to transmit when conditions permit, thus balancing latency requirements with overall network productivity.
Solution Approach 2:
The patent incorporates feedback mechanisms where the access point monitors traffic conditions and dynamically adjusts transmission parameters. Based on network state and traffic patterns, the system modulates the level of prioritization applied to high priority traffic, ensuring latency requirements are met when needed while maintaining fairness and overall throughput during normal operating conditions.
3Reliability
If transmission management features are added to meet latency requirements, then quality of service improves, but protocol complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring quality of service parameters and transmission priorities in the network infrastructure before traffic flows begin. The access point and stations exchange capability information and establish QoS parameters in advance, allowing high priority traffic to receive appropriate handling without requiring complex real-time decisions, thus improving reliability while limiting protocol complexity to manageable levels.
Solution Approach 2:
The patent uses the MAC layer as an intermediary between the physical transmission layer and higher application layers. This intermediary layer handles QoS management and latency control through standardized mechanisms like priority tagging and differentiated backoff, absorbing the complexity of quality of service requirements without propagating it upward to application protocols or downward to physical layer implementations.
Data Source
AI summary
Methods and apparatuses are disclosed for a station (STA) in a Wireless Local Area Network (WLAN) to indicate its intent to transmit high priority traffic, such as low latency traffic, over a shared wireless medium. The transmission by a STA of a signal referred to as a Low Latency Traffic Indication (LLTI) signal and conditions for doing so are disclosed. An Access Point (AP) broadcasts LLTI management information relating to conditions subject to which STAs may transmit the LLTI signal and contend for the wireless medium for the purpose of transmitting low latency traffic. Information that may be included in the LLTI management information is disclosed. Multiple embodiments of methods and apparatuses are disclosed.