option 1-
first: make sure router suport seting WPS device
second: kalu router suport leh lah beli device WPS untk extention wifi conection..
option kedua-
beli lah wifi device(access point) utk setiap tgkat..pastu setup laa..nrmaly AP skrg dah build in WPS seting..juz configure je..pakai router d-link pon dah ok..