And 802.11ah, in 900MHz which has some hope of penetrating such walls, is still very scarce and the hardware fairly expensive. Otherwise you just have to run a

And 802.11ah, in 900MHz which has some hope of penetrating such walls, is still very scarce and the hardware fairly expensive. Otherwise you just have to run a wire through the wall and put an AP in the room. Your clients can still be wireless for the last few feet, which preserves the convenience of usage, just not the convenience of deployment.