Frame-Based Channel Access Technique for Low-Latency Wireless Networks
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Solution Overview
Problem
Existing IEEE 802.11 channel access techniques, such as EDCA, often result in random and potentially long channel access delays, leading to channel waste and increased latency, particularly in scenarios with multiple contending stations, which is problematic for low-latency applications like augmented and virtual reality.
Innovation Solution
The implementation of a frame-based equipment (FBE) channel access technique, which includes an electronic device providing frames with indications of using FBE and its attributes, such as a fixed frame period, to facilitate efficient channel access, reducing delays and improving channel utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If EDCA channel access technique is used, then devices can access the channel with random backoff, but this results in random and potentially long channel access delays
Solution Approach 1:
The patent implements FBE (Frame Based Equipment) channel access technique where devices operate in periodic frames with fixed durations. Each frame contains a channel access period where devices can transmit and a silent period where devices remain silent. This periodic structure replaces the random backoff mechanism of EDCA, providing predictable and controllable channel access delays suitable for time-sensitive applications.
Solution Approach 2:
The patent introduces dynamic frame structure where the access point can dynamically adjust frame parameters including frame duration, silent period duration, and the number of devices allowed to access the channel. This dynamic configuration enables the system to adapt to varying traffic conditions while maintaining predictable channel access patterns, resolving the contradiction between reliability and time loss.
2Reliability
If random backoff is performed based on contention window, then transmission failures are handled, but this causes more random transmission delay and increases channel waste
Solution Approach 1:
The patent implements preliminary channel assessment before transmission within each frame's access period. Devices perform clear channel assessment (CCA) at the beginning of the access period and, if the channel is clear, can immediately transmit without waiting for random backoff intervals. This preliminary action eliminates the random delay component while maintaining transmission reliability through the structured frame-based approach.
Solution Approach 2:
The patent ensures continuous useful action by allowing multiple devices to transmit within the same frame's access period without requiring them to wait for each other's backoff periods. The access point coordinates transmissions to ensure continuous utilization of the channel during the access period, eliminating the idle time and channel waste associated with random backoff mechanisms.
3Quantity of substance
If more stations are in a basic service set, then network capacity increases, but this increases idle time with no transmission and channel waste
Solution Approach 1:
The patent segments the channel access opportunity into distinct time slots within each frame's access period. Each station is assigned specific time slots or opportunities to transmit, allowing multiple stations to coexist without interfering with each other's transmissions. This segmentation enables the network to support more stations while minimizing idle time and channel waste, as the channel is continuously utilized by different stations in their assigned slots.
Solution Approach 2:
The patent changes the fundamental parameter of channel access from random backoff duration to fixed frame-based time slots. By adjusting frame parameters such as access period duration, silent period duration, and the number of transmission opportunities per frame, the system can optimize channel utilization for networks with varying numbers of stations. This parameter change allows the network to scale to more stations while maintaining high channel efficiency and minimizing waste.
Data Source
AI summary
An electronic device (such as an access point) that provides a frame is described. This electronic device includes: an antenna node communicatively coupled to an antenna; and an interface circuit, communicatively coupled to the antenna node, that communicates with a second electronic device. During operation, the interface circuit may provide, addressed to the second electronic device, the frame that includes an indication that the electronic device uses a frame-based equipment (FBE) channel access technique and attributes of the FBE channel access technique. The attributes may include: a duration of the FBE channel access technique, and a fixed frame period (FFP) for communication during the FBE channel access technique. Moreover, the frame may be compatible with an Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard.