Decoupled Virtual Access Points for Wireless Interference Isolation
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Solution Overview
Problem
Existing wireless local area network architectures using a single access point face interference issues and coverage problems due to physical obstacles, leading to degraded throughput for all nodes when one node experiences low throughput, and there is no effective coordination for uplink data transmissions in CSMA networks.
Innovation Solution
Decoupling virtual access points from a main node to allocate bandwidth based on each client's specific needs, using a controller to manage time intervals for data transmission and silence periods to prevent interference, ensuring that the quality of the link between a client and the access point is not affected by other clients' links.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a single access point uses high transmission power to cover a space, then the coverage area is improved, but interference with the neighborhood increases and public health risks arise
Solution Approach 1:
The patent divides a single access point into multiple virtual access points (VAPs), each serving specific clients with dedicated time slots. This segmentation allows the system to provide wide coverage through multiple directional beams while controlling interference by activating only the necessary VAPs at any given time, rather than using high power omnidirectional transmission.
2Reliability
If a node modifies its modulation type to cope with low throughput, then its own connection is maintained, but the throughput of all other transmitting nodes is degraded
Solution Approach 1:
The controller pre-calculates and allocates dedicated time slots to each client based on their channel conditions and throughput requirements. By determining transmission schedules in advance, the system prevents nodes from needing to degrade their modulation, as each node transmits during its allocated slot when it can maintain optimal modulation without affecting others.
Solution Approach 2:
The system dynamically adjusts time slot allocations and modulation schemes based on real-time channel conditions. The controller continuously monitors link quality and reoptimizes the transmission parameters and slot assignments, allowing each node to operate at its optimal throughput without forcing other nodes to degrade their connections.
3Ease of operation
If wireless nodes share the same channel for uplink transmission using CSMA/CA, then channel access is simplified, but one node can monopolize the resource and block all other communications
Solution Approach 1:
The patent implements periodic time-division multiplexing where each client is assigned specific time slots for uplink transmission. This periodic structure maintains simplicity by providing regular, predictable access opportunities for each node, while preventing monopolization since no single node can transmit outside its allocated slots. The cyclic nature ensures fair resource distribution while keeping the access mechanism straightforward.
Data Source
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AI summary
The invention relates to a method of establishing a first and a second association between a main node and respectively a first and a second wireless node, the first association associating a first virtual access point VAP1 of the main node and the first node, the first virtual access point sending the first node first beacon frames comprising a first item of information BSSID1 representative of said first association BSS1, the first virtual access point VAP1 being identified by a services set identifier SSID. According to the invention, when the main node receives a request from the node for the establishment of the second association BSS2, the method comprises, at the level of a controller, a step of creating a second virtual access point so as to isolate the transmissions on the associations.