Non-Primary Channel Access for Overlapping Network Congestion

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Solution Overview

Problem

The current 802.11 standard is bottlenecked by a single primary channel, leading to inefficient utilization of wideband channels, especially when the primary channel is busy due to OBSS traffic or interference.

Innovation Solution

The implementation of a Non-Primary Channel Access (NPCA) method allows frame exchanges on secondary channels while the primary channel is busy, enabling dynamic switching based on OBSS frame observations and NAV settings.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single primary channel is used for synchronization and channel access, then the system maintains simplicity in channel management, but the channel utilization becomes inefficient when the primary channel is busy due to OBSS traffic or interference

Engineering Contradiction:

Improvechannel management complexityVSAvoidchannel utilization efficiency

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The patent divides the channel access function into two independent parts: a primary channel for synchronization and control frame exchanges, and secondary channels for data frame transmissions. This segmentation allows devices to perform different operations on different channels simultaneously, resolving the contradiction by enabling efficient channel utilization without increasing overall system complexity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a new dimension to channel access by allowing frame exchanges on secondary channels while the primary channel is busy. Instead of being constrained to a single channel dimension, the system now operates across multiple channel dimensions, enabling parallel operations and improving overall channel utilization efficiency.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Ease of operation

If devices wait for the primary channel to become idle before transmitting frames, then channel access control remains simple, but data transfer efficiency decreases due to congestion and delays

Engineering Contradiction:

Improvechannel access control simplicityVSAvoiddata transfer delay

Core Design Contradiction:

Ease of operationVSLoss of time

Solution Approach 1:

The patent performs preliminary actions by establishing synchronization on the primary channel first, then pre-positioning devices to transmit data frames on secondary channels. This preliminary synchronization followed by parallel data transmission on multiple channels reduces waiting time and improves data transfer efficiency while maintaining simple access control through the primary channel.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent ensures continuous useful action by enabling frame exchanges on secondary channels even when the primary channel is busy. Instead of interrupting data transmission to wait for the primary channel, the system maintains continuous data flow on secondary channels, eliminating delays and improving overall transmission efficiency.

Inventive Principle:

Principle #20Continuity of useful action

3Object-affected harmful factors

If the primary channel is blocked by OBSS traffic, then interference avoidance is achieved, but overall network throughput decreases due to inability to access secondary channels

Engineering Contradiction:

ImproveOBSS interference avoidanceVSAvoidnetwork throughput

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The patent extracts the data transmission function from the primary channel and relocates it to secondary channels. By taking out the data frame exchange operation from the blocked primary channel and performing it on independent secondary channels, the system avoids OBSS interference while maintaining network throughput through parallel transmission paths.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent uses the primary channel as an intermediary for synchronization and control, while secondary channels serve as intermediaries for actual data transmission. This intermediary structure allows the system to avoid OBSS interference on the primary channel while maintaining efficient data flow through secondary channels, preserving network throughput.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20250151109A1Non-primary channel access operation

Publication Date: 2025.05.08 INTEL CORP

AI summary

This disclosure describes systems, methods, and devices related to enhanced channel access. A device may send a Multi-User Request to Send (MU-RTS) frame on a basic service set (BSS) primary channel to an overlapping basic service set (OBSS). The device may receive a Clear to Send (CTS) frame in response to the MU-RTS frame on the BSS primary channel. The device may initiate a switch to a non-primary channel access (NPCA) primary channel upon detection of a physical (PHY) preamble. The device may maintain NPCA operation on the NPCA primary channel until a network allocation vector (NAV) expires. The device may announce a location and bandwidth of the NPCA primary channel to associated stations (STAs).