Active Scanning Probe Request Frame Channel Monitoring
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Solution Overview
Problem
Existing wireless LAN technologies face challenges in reducing initial link setup time, particularly during the active scanning process, due to lengthy scanning delays and inefficiencies in channel monitoring and probe response handling.
Innovation Solution
A method and device for active scanning that involve transmitting a probe request frame with channel monitoring type information, determining the scanning channel's busy state, and adjusting the probe response monitoring time based on whether a valid PPDU is received within the MinimumChannelTime or MaximumChannelTime, allowing for efficient channel scanning and reducing unnecessary delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the STA monitors the scanning channel for the maximum channel time to ensure receiving the probe response frame, then the reliability of AP discovery is improved, but the scanning delay increases
Solution Approach 1:
The patent applies dynamics by making the channel monitoring time adjustable rather than fixed. The STA dynamically selects between minimum and maximum channel monitoring times based on whether it is performing rapid link configuration. This allows the system to adapt the monitoring duration to specific operational requirements, achieving both fast scanning when possible and reliable AP discovery when needed.
Solution Approach 2:
The patent changes the parameter of channel monitoring time based on the STA's operational mode. By introducing channel monitoring type information that distinguishes between rapid link configuration STAs and other STAs, the system modifies the monitoring time parameter accordingly - using minimum time for rapid configuration to reduce delay, and maximum time for other cases to ensure reliability.
2Speed
If the STA performs rapid link configuration with reduced monitoring time, then the scanning speed is improved, but the risk of missing probe response frames increases
Solution Approach 1:
The patent changes the channel monitoring time parameter based on the STA type. For STAs performing rapid link configuration, the monitoring time is set to minimum channel time to maximize scanning speed. For other STAs, the monitoring time is set to maximum channel time to ensure reliable probe response reception. This parameter adaptation resolves the contradiction between speed and reliability.
Solution Approach 2:
The system dynamically adjusts the monitoring strategy based on the STA's configuration mode. By introducing channel monitoring type information, the STA can switch between different monitoring behaviors - rapid scanning mode for time-critical applications and thorough monitoring mode for reliability-critical applications.
3Loss of information
If the STA monitors the channel until maximum channel time when PPDU is received, then the completeness of channel information is improved, but the scanning efficiency decreases
Solution Approach 1:
The patent modifies the channel monitoring duration parameter based on reception conditions and STA type. When a valid PPDU is received, rapid link configuration STAs monitor only until minimum channel time to maintain high scanning efficiency, while other STAs continue monitoring until maximum channel time to ensure complete channel information collection.
Solution Approach 2:
The patent segments the STA population into different categories (rapid link configuration STAs and other STAs) with different monitoring requirements. This segmentation allows the system to apply different monitoring strategies to different groups, optimizing both efficiency and information completeness for each segment.
Data Source
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AI summary
A method and a device for performing active scanning are disclosed. The method for active scanning of a STA comprises the steps of: enabling the STA to transmit, to an AP, a probe request frame that contains channel monitoring type information in a scanning channel; enabling the STA to determine whether the scanning channel is in a busy state until a minimum channel time; enabling the STA to determine whether a PPDU including a valid PLCP header is received in the scanning channel until the minimum channel time; and enabling the STA to determine a time for monitoring a probe response frame transmitted by the AP in the scanning channel on the basis of whether the PPDU is received until the minimum channel time and of channel monitoring type information, when the scanning channel is in the busy state, wherein the channel monitoring type information can contain information on a type with which the STA monitors the probe response frame in the scanning channel.