Multi-Primary Channel Access for Busy Wideband WLANs
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Solution Overview
Problem
Current wireless communication systems are inefficient in utilizing wideband channels due to the reliance on a single primary channel for synchronization, leading to underutilization of secondary channels when the primary channel is busy, especially in environments with Overlapping Basic Service Sets (OBSS) traffic or interference.
Innovation Solution
A mechanism is introduced to enable access to multiple primary channels, allowing wireless stations to synchronize and transmit frames on idle channels, even if the single primary channel is busy, by notifying stations of available channels and tracking Network Allocation Vector (NAV) timers to optimize channel usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single primary channel is used for synchronization in wireless communication systems, then channel access control is simplified, but channel utilization efficiency deteriorates when the primary channel is busy
Solution Approach 1:
The patent divides the single primary channel into multiple primary channels (first primary channel and second primary channel). This segmentation allows wireless stations to synchronize on different primary channels independently, so that when one primary channel is busy, stations can still access the wireless medium through other primary channels, thereby improving channel utilization efficiency without significantly increasing access control complexity
Solution Approach 2:
The patent introduces a new dimension of channel access by allowing stations to select from multiple primary channels rather than a single fixed primary channel. This dimensional expansion from one primary channel to multiple primary channels enables parallel synchronization paths, resolving the bottleneck where a single busy primary channel would block all channel access
2Device complexity
If a single primary channel is used for frame transmission, then protocol simplicity is maintained, but wait time increases when the primary channel is occupied
Solution Approach 1:
By segmenting the single primary channel into multiple primary channels, the patent creates multiple independent transmission paths. When one primary channel is occupied by OBSS traffic or interference, stations can switch to other primary channels for frame transmission, reducing wait time while maintaining relatively simple protocol operation through existing NAV timer mechanisms
Solution Approach 2:
The patent introduces dynamic channel selection capability where stations can dynamically choose which primary channel to synchronize on based on real-time channel availability. This dynamic approach allows stations to adapt their synchronization channel based on current traffic conditions, reducing wait time without requiring complex protocol changes
3Productivity
If secondary channels are used when primary channel is busy, then channel utilization improves, but synchronization reliability deteriorates
Solution Approach 1:
The patent segments the primary channel function across multiple primary channels, each capable of independent synchronization. This segmentation maintains synchronization reliability because stations can reliably synchronize on any of the multiple primary channels, while also improving channel utilization by allowing stations to use idle primary channels even when other primary channels are busy
Data Source
AI summary
This disclosure describes a system for accessing multiple primary channels in a wireless medium. A device may cause to send a beacon frame to one or more wireless stations (STA(s)). wherein the beacon frame comprises a notification of two or more primary channels at an access point (AP). The device may receive a first physical layer protocol data unit (PPDU) from a first STA of the one or more STAs. The device may select a first primary channel of the two or more primary channels. wherein the first primary channel is idle. The device may cause to transmit the first PPDU from the first STA on the first primary channel.