Communication Apparatus Dynamic Channel Width Selection
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Solution Overview
Problem
Communication apparatuses that concurrently execute infrastructure and P2P modes with a single wireless chip and antenna face challenges in channel width selection and OBSS scan functionality, leading to potential packet losses and reduced communication quality, especially when handling large image data transfers.
Innovation Solution
A communication apparatus that selects an appropriate channel width between 20 MHz and 40 MHz based on the communication mode, ensuring stable operation and reducing packet losses by fixing the channel width to 20 MHz when both modes are active, thereby preventing OBSS scan-induced disruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a 40 MHz channel width is used to double throughput, then communication speed is improved, but interference from neighboring BSS and frame collision with non-IEEE802.11n devices increases
Solution Approach 1:
The patent implements dynamic channel width switching capability, allowing the communication apparatus to adapt between 20 MHz and 40 MHz modes based on environmental conditions and operational requirements, rather than being fixed to a single channel width
Solution Approach 2:
The patent changes the channel width parameter from a fixed value to a dynamically adjustable parameter, enabling the system to optimize between throughput and stability by selecting appropriate channel widths based on OBSS detection results and communication mode
2Object-affected harmful factors
If OBSS scan is performed to detect neighboring networks, then interference avoidance is improved, but communication quality deteriorates due to channel switchover
Solution Approach 1:
The patent performs preliminary OBSS scanning and detection before establishing communication, allowing the system to proactively identify potential interference sources and select appropriate channel widths in advance, preventing interference-related issues before they occur
Solution Approach 2:
The patent implements a feedback mechanism where OBSS scan results are continuously monitored and used to adjust channel width selection, creating a closed-loop system that adapts to changing wireless environments while maintaining stable communication
3Device complexity
If a single wireless chip and antenna are used to execute both infrastructure and P2P modes, then device complexity is reduced, but channel width selection flexibility is limited
Solution Approach 1:
The patent enables a single wireless communication apparatus to perform multiple functions (infrastructure mode and P2P mode) with a single wireless chip and antenna, while maintaining the capability to dynamically select channel widths appropriate for each mode through software-controlled parameter adjustment
4Reliability
If channel width is fixed to 20 MHz when both infrastructure and P2P modes are active, then packet loss is reduced, but communication speed is limited
Solution Approach 1:
The patent implements dynamic channel width adjustment based on operational mode, allowing the system to use 20 MHz when both infrastructure and P2P modes are active to minimize packet loss, while automatically switching to 40 MHz when only P2P mode is active to maximize communication speed
Data Source
AI summary
Deterioration of communication is prevented in a communication apparatus, in which an infrastructure mode and a P2P mode are independently and concurrently executable, according to an embodiment of the present invention. Hence, in a case where the communication apparatus is in a state in which a first mode of executing wireless communication with a communication partner apparatus via an external access point and a second mode of executing wireless communication with an external apparatus without using the external access point are concurrently executable, the following selection is made. That is, a first channel width which is not accompanied by network detection processing is selected.