Roaming Frequency Notification to Suppress Interference
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Solution Overview
Problem
In wireless communication systems, network shifts can lead to interference between networks operating on the same frequency, degrading communication performance, particularly when a communication apparatus functions as both an access point (AP) and a station (STA) and switches between networks.
Innovation Solution
A communication apparatus is configured with a notification unit to inform other devices of frequency channels it cannot roam on, preventing interference by excluding these channels from roaming destination candidates, and an execution unit to execute roaming instructions based on received notifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a communication apparatus operates as both STA and AP concurrently and shifts network in accordance with roaming instructions, then network load distribution is improved and network resource efficiency is enhanced, but interference between networks occurs when the shift destination uses the same frequency as the AP network
Solution Approach 1:
The communication apparatus performs preliminary action by notifying the first network of the frequency channel used in the third network (AP mode) before roaming occurs. This allows the first network to identify and exclude this frequency from roaming destination candidates, preventing interference before it happens. The notification is sent in advance through association request or reassociation request frames.
Solution Approach 2:
The patent introduces an intermediary mechanism - the notification unit that communicates frequency channel information between the communication apparatus and the first network. This intermediary enables the system to coordinate roaming decisions and avoid frequency conflicts by sharing information about channels used in AP mode, thus mediating between the STA's roaming needs and the AP's interference avoidance requirements.
2Object-affected harmful factors
If the communication apparatus notifies other devices of frequency channels incapable of roaming to prevent interference, then interference suppression is achieved, but communication complexity increases due to additional notification and coordination mechanisms
Solution Approach 1:
The notification unit leverages existing communication frames (association request, reassociation request) that already serve other purposes. By adding frequency channel information notification to these multi-functional frames, the patent avoids creating entirely new communication protocols, thus reducing the increase in system complexity while still achieving interference suppression.
Data Source
AI summary
A communication apparatus that performs wireless communication notifies another communication apparatus of, as information of a frequency channel incapable of roaming, information of a frequency channel used in a third network in which the communication apparatus can perform communication concurrently with the first network, wherein the other communication apparatus has a function of, in a case where the communication apparatus connects to a first network, issuing an instruction of roaming from the first network to a second network, and in a case where the roaming instruction based on the notification is received from the other communication apparatus after connecting to the first network, executes roaming based on the instruction.