Multi-Link Device Beacon Frame Channel Switch Coordination
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Solution Overview
Problem
Multi-link devices (MLDs) operating in wireless local area networks (WLANs) face challenges in efficiently communicating elements across different frequency bands, as some devices can only listen to one frequency band at a time, leading to potential missed important fields or elements, especially during channel switching or quieting procedures.
Innovation Solution
The implementation of extended channel switch announcement and quiet elements in beacon and probe response frames allows APs operating on different frequency bands to coordinate channel changes and quiet periods, ensuring that associated STAs follow the procedures as if they received the elements directly from the primary AP, even if they are only listening on one frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If STAs listen to only one frequency band at a time, then power consumption and device complexity are reduced, but important elements may be missed during channel switching or quieting procedures
Solution Approach 1:
The patent uses beacon frames and probe response frames as intermediary carriers to transport channel switch announcement elements and quiet elements from the primary AP to STAs. These frames act as mediators that deliver critical information across frequency bands without requiring STAs to simultaneously monitor multiple bands, thus resolving the contradiction between simple radio configuration and complete information reception.
Solution Approach 2:
The patent implements copying of channel switch announcement elements and quiet elements from the primary AP's transmissions to beacon and probe response frames. This copying mechanism ensures that STAs receive critical elements through their monitored frequency band without needing to directly receive them from the primary AP on a different frequency band, preventing information loss while maintaining simple radio configurations.
2Reliability
If APs coordinate channel changes across multiple frequency bands, then network reliability is improved, but communication complexity increases
Solution Approach 1:
The patent makes beacon frames and probe response frames multi-functional by using them not only for their traditional purposes but also as carriers for channel switch announcement elements and quiet elements. This universality allows a single communication mechanism to serve multiple functions across different frequency bands, improving network reliability without proportionally increasing communication complexity.
Solution Approach 2:
The patent changes the parameter of information carrying capacity in beacon and probe response frames by incorporating additional elements (channel switch announcements and quiet elements). This parameter change enables these frames to convey multiple types of critical information simultaneously, coordinating channel changes across frequency bands while managing complexity through existing frame structures.
3Loss of information
If STAs monitor multiple frequency bands simultaneously, then all elements are received, but power consumption and processing requirements increase
Solution Approach 1:
The patent introduces beacon frames and probe response frames as intermediary carriers that transport critical elements from the primary AP to STAs. This intermediary mechanism allows STAs to remain tuned to a single frequency band while still receiving elements that originate from the primary AP on different frequency bands, eliminating the need for multi-band monitoring and reducing power consumption.
Solution Approach 2:
The patent implements a copying mechanism where channel switch announcement elements and quiet elements are copied from the primary AP's transmissions and embedded in beacon and probe response frames. STAs receive these copied elements through their single monitored frequency band, achieving complete element reception without the energy cost of monitoring multiple frequency bands simultaneously.
Data Source
AI summary
Methods, apparatuses, and computer readable media for communicating elements between multi-link devices are disclosed. Apparatuses of a first access points (AP) of an AP multi-link device (MLD) are disclosed, where the apparatuses comprise processing circuitry configured to encode a first portion of a first beacon frame or first response frame, and in response to a second AP of the AP MLD transmitting, on a second frequency band, a second beacon frame or a second probe response frame comprising a channel switch announcement element or an enhanced channel switch announcement frame, encoding a second portion of the first beacon frame or the first probe response frame, the second portion comprising the channel switch announcement element or the enhanced channel switch announcement frame. The processing circuitry is further configured to configure the first AP of the AP MLD to transmit, on a first frequency band, the first beacon frame.