VHT WLAN Transmission Rate Limiting via Pause Management
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Solution Overview
Problem
Current wireless local area network (WLAN) technologies face challenges in effectively limiting transmission rates, particularly in very high throughput (VHT) WLAN systems, which can lead to overloads and inefficient use of radio resources.
Innovation Solution
A method is introduced that involves receiving pause management messages with scheduling information to pause and resume data frame transmissions, allowing for controlled transmission rate limiting without completely halting all transmissions, utilizing pause management messages to manage uplink data frame transmissions and adjust based on channel state and data frame characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmission rate is increased in VHT WLAN system, then throughput is improved, but system overload occurs and radio resources are inefficiently used
Solution Approach 1:
The patent implements dynamic transmission rate control by allowing stations to adjust their transmission rates based on received power levels and pause management messages. The transmission rate is not fixed but dynamically adapted to current channel conditions and network load, resolving the contradiction between maximizing throughput and preventing system overload.
Solution Approach 2:
The access point monitors received power levels from stations and sends pause management messages with pause time and pause duration information back to stations. This feedback mechanism allows the system to detect overload conditions and adjust transmission rates accordingly, preventing system overload while maintaining high throughput when conditions permit.
2Reliability
If transmission rate is limited to prevent overload, then system reliability is improved, but radio resource utilization decreases
Solution Approach 1:
The transmission rate limiting is not static but dynamic, adjusting based on real-time channel conditions and network state. When the access point detects favorable conditions, it reduces or eliminates pause durations, allowing stations to utilize radio resources more aggressively. When overload is detected, pause durations are increased to limit transmission rates. This dynamic approach prevents permanent underutilization of radio resources.
Solution Approach 2:
The system uses periodic pause management messages to control transmission rates, implementing rhythmic transmission patterns rather than continuous or completely blocked transmission. The pause time and pause duration create periodic transmission cycles that prevent overload while maintaining reasonable resource utilization through controlled transmission bursts.
3Productivity
If complete transmission pause is implemented to control rate, then transmission rate limiting is achieved, but transmission efficiency is reduced
Solution Approach 1:
Instead of implementing complete transmission pauses, the system applies partial action through selective pause management. The access point sends pause management messages that specify particular pause times and pause durations, allowing transmission to continue during other periods. This partial pausing achieves rate control while minimizing transmission efficiency loss by allowing ongoing transmissions to complete and enabling new transmissions during non-pause periods.
Data Source
AI summary
A method for limiting a transmission rate is provided. The method includes receiving a pause management message comprising pause scheduling information including a pause time at which an uplink transmission of a data frame is to be paused and a paused duration indicating a duration during which transmission of the data frame is to be paused, and pause station information indicating a station which is to pause transmission the data frame, from an access point (AP); and pausing transmission of the data frame during the paused duration starting from the pause time according to the pause management message, and then resuming transmission. According to exemplary embodiments of the present invention, a transmission rate limiting mechanism suitable for a VHT WLAN can be provided.