Access Point Deauthentication Frame Transmission Across Subband Channels
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Solution Overview
Problem
In wireless communication networks, particularly those adhering to IEEE 802.11 standards, there is a deadlock situation where client devices remain connected to a primary subband channel even after the access point (AP) has changed its primary control channel, leading to unnecessary communication overhead and potential security vulnerabilities due to missed deauthentication/disassociation frames when devices are in sleep mode.
Innovation Solution
The AP is configured to transmit deauthentication/disassociation frames on all subband channels within the wider bandwidth, ensuring that client devices receive these frames even if they were asleep, thereby forcing them to reconnect on the new primary channel and preventing deadlock situations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the AP changes its primary control channel to a subband channel, then the network can operate more efficiently on the new channel, but client devices that are in sleep mode may miss deauthentication/disassociation frames and remain connected on the old channel, causing deadlock situations
Solution Approach 1:
The patent segments the deauthentication/disassociation frame transmission across multiple subband channels. Instead of transmitting the frame on a single channel, the AP transmits it on all subband channels within the wider bandwidth, ensuring that client devices wake up on any channel can receive the frame and properly disconnect.
Solution Approach 2:
The patent adds a dimensional approach to frame transmission by expanding from a single-channel transmission to multi-channel transmission. The deauthentication/disassociation frames are transmitted across the frequency dimension (multiple subband channels), creating a redundant transmission path that increases the probability of successful delivery regardless of which channel the client monitors.
2Loss of energy
If deauthentication/disassociation frames are transmitted only on the current primary control channel, then communication overhead is reduced, but client devices in sleep mode cannot receive these frames, leading to unnecessary reconnection attempts and security vulnerabilities
Solution Approach 1:
The transmission task is segmented across multiple subband channels. Each channel carries a copy of the deauthentication/disassociation frame, allowing the system to maintain low overhead on each individual channel while achieving high reliability through distributed transmission across the frequency spectrum.
Solution Approach 2:
The AP transmits deauthentication/disassociation frames proactively on all subband channels before the client device may attempt to reconnect. This preliminary action ensures that when the client wakes up, the disconnection information is already available on its monitored channel, preventing unnecessary reconnection attempts and security issues.
3Stability of the object's composition
If client devices remain connected to the old primary channel after AP channel change, then they maintain their association state, but this creates deadlock situations where they cannot communicate on the new channel and generate unnecessary traffic
Solution Approach 1:
The system performs preliminary deauthentication/disassociation frame transmission on all subband channels before the client device can attempt to maintain its association on the old channel. This ensures that when the client wakes up and checks for frames, it receives the disconnection notification and properly updates its association state, avoiding deadlock situations.
Solution Approach 2:
The system implements a feedback mechanism where client devices that receive deauthentication/disassociation frames on any subband channel are expected to update their connection state and reconnect on the new primary channel. This feedback loop ensures that the association state is properly synchronized between the AP and client devices, eliminating stale connections.
Data Source
AI summary
Systems and methods can advantageously provide deauthentication/disassociation frames A method includes providing, by a first device, a disassociation frame or a deauthentication frame on a first primary control channel in response to an indication of a change from the first primary control channel to a second primary control channel, and receiving, by the first device, a data frame from a second network device on the first control primary channel, the second primary control channel or a secondary channel. The method also includes providing, by the first device, another disassociation frame or deauthentication frame on the first primary control channel, the second primary control channel and/or the secondary channel associated with the data frame.