Unsolicited Protocol Frames for Radar Detection in 802.11 Networks
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Solution Overview
Problem
In regulatory domains where stations cannot detect radar themselves, the process of scanning for radar presence to determine available channels for transmission is inefficient, leading to longer wait times due to reliance on passive scanning and beacon transmissions.
Innovation Solution
An apparatus and method that involves generating and transmitting protocol frames containing regulatory domain information and radar presence data unsolicitedly, allowing stations to determine channel availability independently of beacon intervals, thereby reducing wait times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stations perform passive scanning to wait for beacons containing radar information, then stations can determine channel availability, but average wait times increase up to one beacon period per scanned channel
Solution Approach 1:
The access point performs preliminary scanning for radar presence and proactively transmits the results to stations before the stations would need to perform passive scanning. This preliminary action eliminates the waiting time for stations, as they receive the radar presence information in advance through the unsolicited protocol frame transmission.
Solution Approach 2:
The access point acts as an intermediary that collects radar presence information and transmits it to stations through unsolicited protocol frames. This intermediary mechanism allows stations to obtain channel availability information without directly performing passive scanning, thereby reducing their wait times while maintaining reliable channel determination.
2Reliability
If stations rely on beacon transmissions for radar information, then channels can be determined to be available, but transmission efficiency decreases due to longer wait times
Solution Approach 1:
The access point continuously monitors radar presence and continuously transmits unsolicited protocol frames containing this information to stations. This continuous action ensures that stations always have up-to-date channel availability information without needing to wait for periodic beacons, thereby maintaining both detection accuracy and transmission efficiency.
Solution Approach 2:
The access point proactively transmits radar presence information to stations before the stations would need to request it or wait for beacon transmissions. This preliminary transmission of useful information eliminates idle waiting time and keeps transmission operations continuous and efficient.
3Reliability
If the system scans channels in a fixed range as per IEEE TGk, then regulatory compliance is maintained, but the amount of scanning required increases
Solution Approach 1:
The access point extracts and transmits only the relevant radar presence information for channels within the regulatory domain to stations through unsolicited protocol frames. This extraction of essential information eliminates the need for stations to perform extensive scanning of all channels in the fixed range, thereby reducing scanning time while maintaining regulatory compliance.
Solution Approach 2:
The access point serves as an intermediary that performs the scanning of channels within the regulatory domain and consolidates the results into unsolicited protocol frames for transmission to stations. This intermediary approach centralizes the scanning function, reducing overall scanning time while ensuring regulatory compliance through systematic channel coverage.
Data Source
AI summary
In order to reduce the average wait time, information regarding regulatory domain, a component of channel availability, may be obtained through an apparatus and method for transmitting within available channels in a wireless network. This includes determining available channels in a wireless network by: receiving regulatory domain information within the wireless network; generating a frame with at least one component corresponding to the regulatory domain information; transmitting the frame unsolicited by a beacon; receiving the report at a station; and determining whether a channel is available for transmission based, at least in part, on the component corresponding to the regulatory domain information contained in the frame.