6 GHz Non-PSC AP Discovery via PSC RNR Beacons
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Solution Overview
Problem
In crowded environments where some APs do not support 2.4 GHz or 5 GHz channels, requiring STAs to scan all 6 GHz channels for non-PSC APs can consume significant power and be burdensome, especially when APs transmit beacons on PSC channels only.
Innovation Solution
A central controller configures APs to operate on PSC and non-PSC channels, transmitting Reduced Neighbor Reports (RNRs) on PSC channels to inform STAs about nearby non-PSC APs, allowing STAs to connect directly to these APs without scanning all channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If STAs scan all 6 GHz channels to discover non-PSC APs, then channel discovery completeness is improved, but power consumption increases
Solution Approach 1:
APs transmit RNR information containing non-PSC channel details in advance through PSC channel beacons, allowing STAs to obtain neighbor channel information before actually needing to scan those channels. This preliminary provision of information eliminates the need for STAs to perform exhaustive scans of all 6 GHz channels, significantly reducing power consumption while maintaining complete channel discovery capability
Solution Approach 2:
The RNR (Reduced Neighbor Report) mechanism acts as an intermediary that carries information about non-PSC APs and their operating channels. Instead of STAs directly scanning all channels to discover APs, the RNR intermediary provides pre-packaged neighbor information, enabling indirect discovery that conserves STA power while achieving the same discovery completeness
2Reliability
If STAs scan all 6 GHz channels to ensure connection to non-PSC APs, then connection reliability is improved, but scanning time increases
Solution Approach 1:
APs perform the action of transmitting their non-PSC channel information in advance through RNR elements in PSC beacons. This preliminary broadcasting of operational information allows STAs to immediately know which non-PSC channels to scan, eliminating time-wasting exhaustive scans while ensuring STAs have complete information for reliable connection establishment
Solution Approach 2:
STAs can skip the time-consuming process of scanning all 6 GHz channels by using RNR information to directly identify and jump to the specific non-PSC channels where target APs are operating. This selective approach rushes through the discovery process by focusing only on relevant channels, reducing scanning time while maintaining connection reliability
3Device complexity
If APs only transmit beacons on PSC channels, then device complexity is reduced, but information availability for non-PSC APs deteriorates
Solution Approach 1:
The PSC channel beacon serves multiple functions: it provides standard network identification information and simultaneously carries RNR elements that convey non-PSC AP neighbor information. This multi-functionality allows APs to maintain simple single-channel beacon transmission while ensuring comprehensive information availability about non-PSC APs, eliminating the need for separate transmission mechanisms
Solution Approach 2:
The patent merges the function of PSC beacon transmission with non-PSC AP information dissemination by embedding RNR elements within the PSC beacon structure. This combination allows APs to transmit both types of information through a single transmission mechanism, maintaining transmission simplicity while preventing information loss about non-PSC APs
Data Source
AI summary
A system and method for the discovery of Access Point Stations operating on non-Preferred Scanning Channels. In some embodiments, the method includes: receiving, by a non-Access Point Station (non-AP STA), from a first Access Point Station (AP STA), in a transmission on a first channel, a Reduced Neighbor Report (RNR); and determining, by the non-AP STA, from the RNR, that a second AP STA is operating on a second channel, the first channel being a Preferred Scanning Channel (PSC), and the second channel being a non-PSC channel.