Wireless AP Reserve Slot Trigger Frames for Latency Reduction
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Solution Overview
Problem
Current wireless local area network (WLAN) technologies face inefficiencies in airtime usage and latency due to individual STA channel contention and backoff, leading to increased transmission latency and reduced throughput, especially with the introduction of MU-OFDMA which does not inherently improve data rate but aims to enhance airtime efficiency.
Innovation Solution
A wireless Access Point (AP) device configured to generate reserve slot time trigger frames and request to transmit trigger frames, allowing for controlled and efficient data transmission from multiple user station devices (STAs) by reserving slot times and scheduling data transmission based on traffic type, thereby reducing latency and improving airtime efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If individual STA channel contention and backoff are used for data transmission, then each STA can independently access the channel, but transmission latency increases and airtime efficiency decreases
Solution Approach 1:
The AP performs preliminary actions by generating reserve slot time trigger frames to reserve channel access slots before actual data transmission occurs. This allows the AP to pre-establish transmission opportunities for multiple STAs, eliminating the need for individual channel contention and backoff procedures, thereby reducing transmission latency while maintaining independent access capability
Solution Approach 2:
The AP acts as an intermediary by using trigger frames to coordinate and schedule data transmissions from multiple STAs. Instead of STAs independently contending for channel access, the AP mediates the process by allocating specific time slots and triggering transmissions in a controlled manner, improving airtime efficiency while preserving individual STA access rights
2Productivity
If MU-OFDMA is implemented to enhance airtime efficiency, then multiple STAs can transmit simultaneously, but the data rate does not inherently improve and system complexity increases
Solution Approach 1:
The system segments the transmission medium into multiple orthogonal frequency subcarriers and time slots, allowing simultaneous transmissions from multiple STAs without interfering with each other. This segmentation enables MU-OFDMA to achieve improved airtime efficiency by dividing the channel into manageable resources that can be independently allocated and controlled
Solution Approach 2:
The system dynamically allocates frequency resources and time slots to different STAs based on traffic requirements and channel conditions. This dynamic resource allocation allows the system to adaptively optimize airtime efficiency while managing complexity through flexible, demand-driven resource assignment rather than static configurations
3Productivity
If slot time is reserved for controlled data transmission, then transmission collisions are avoided and airtime efficiency improves, but channel access flexibility is reduced
Solution Approach 1:
The system implements periodic trigger frames that periodically reserve slot times for data transmission. This periodic structure creates predictable transmission opportunities that improve airtime efficiency by preventing collisions, while still maintaining flexibility as the periodic schedule can be dynamically adjusted based on varying traffic demands and channel conditions
Data Source
AI summary
One example discloses a wireless Access Point (AP) device, configured to operate within a wireless local area network (WLAN), including: a controller configured to generate a reserve slot time trigger frame and a request to transmit trigger frame; wherein the controller is configured to be coupled to an antenna; wherein the antenna is configured to transmit the trigger frames over a physical media to a set of user station devices (STAs) and exchange traffic with the set of STAs over the physical media; wherein the reserve slot time trigger frame is configured to reserve a slot time on the physical media; and wherein the request to transmit trigger frame is configured to command a first STA from the set of STAs to transmit data buffered in the first STA to the AP device.