Wireless Channel Control for Roaming and Ad-Hoc Connectivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, particularly in IEEE 802.11 wireless LANs, when a terminal apparatus roams and changes the infrastructure mode communication channel, it often disconnects from the ad-hoc mode network, leading to unavailable communication with other terminal apparatuses and poor usability due to unsuitable network handling and channel restrictions.
Innovation Solution
A communication apparatus with a first and second communication device, a determination device to assess the usability of a second frequency channel, and a control device to manage communication without connection to a base station, ensuring seamless switching between infrastructure and ad-hoc modes based on channel availability and user settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal apparatus changes the infrastructure mode communication channel due to roaming, then the connection to the base station is maintained, but the ad-hoc mode communication is disrupted and the terminal apparatus is separated from the ad-hoc network
Solution Approach 1:
The patent separates the infrastructure mode communication and ad-hoc mode communication into independent channels. When roaming occurs in infrastructure mode, the ad-hoc mode can continue on the original channel without being affected. This segmentation allows each mode to operate independently, resolving the contradiction between maintaining stable base station connection and preserving ad-hoc network connectivity.
Solution Approach 2:
The patent implements dynamic channel management where the terminal apparatus can independently switch channels for infrastructure mode while maintaining ad-hoc mode on a different channel. This dynamic approach allows the system to adapt to roaming conditions without disrupting ad-hoc communications, enabling flexible multi-mode operation.
2Ease of manufacture
If the terminal apparatus uses a single wireless LAN interface for multi-BSS function, then cost is reduced, but channel switching in infrastructure mode disrupts ad-hoc mode communication
Solution Approach 1:
The patent segments the channel usage for infrastructure mode and ad-hoc mode even when using a single wireless LAN interface. By assigning different channels to different modes, the system maintains communication availability while using cost-effective single-interface hardware.
Solution Approach 2:
The patent changes the frequency channel parameter independently for infrastructure mode and ad-hoc mode. This allows the single wireless LAN interface to operate on different channels for different modes simultaneously, maintaining reliability while using economical hardware.
3Difficulty of detecting and measuring
If the other terminal apparatus scans the wireless network to detect the roaming terminal, then detection capability is improved, but communication efficiency deteriorates due to vain scanning when the roaming terminal has already ended ad-hoc mode
Solution Approach 1:
The patent implements a notification mechanism where the terminal apparatus performing roaming actively notifies other terminals of its mode switching. This feedback eliminates the need for other terminals to scan for detection, improving communication efficiency while maintaining detection capability through direct notification.
Data Source
AI summary
A communication apparatus includes a determination device configured to, in a case where the communication apparatus connects to a first network of a first base station via a first frequency channel and the communication apparatus participates in a second network via the first frequency channel without connection to a base station, determine whether a second frequency channel used by a second base station is usable in the communication performed, and a control device configured to control the communication without connection to the base station according to the determination by the determination device.