I'm sorry you are making this a confusing issue
Let me see if I have this straight
You are gone, you have remote viewing that works
When you get home you want to change the Wi-Fi there.
So that you have good internet in the bedroom
Is that right?
You need to add a Wi-Fi bridge connection
Or and extenter/repeater, the repeater would be located in between the existing Wi-Fi and the bedroom,
Whether or not you have too replace the Cisco..I don't know
The cameras and DVR, are completely irrelevant to extending the Wi-Fi and just confused the issue