We are going to provide Wi-Fi (802.11b/g/n) to a small building with a dozen APs, one AP per room. The rooms are adjacent to each other. Each AP will independently have its own SSID protected by WPA2 shared key, and will be used concurrently by 20 clients (consumer-grade tablets).
We've been asked if we could increase the transmission signal power from the APs - provided that the firmware allows it - for "a better reception" (as APs can increase bandwidth by reducing transmission range, and transmission power is directly proportional to range).
I have some doubts about it, considering that:
Increasing transmission power will enhance its range, making it more likely to interfere with the other signals from the other APs;
Concerning the point above, many network devices in fact implement Transmit Power Control (TPC) to lower signal power in order to reduce interference with other wireless networks;
Trying to increase signal range makes sense to try to reach far clients. Here, it is important that the AP signal is heard only from clients in the same room;
We can increase APs Tx power but - most likely - not clients', therefore the increase in range would be just mono-directional.
I know that the correct answer to this kind of questions is "it depends"; however, I'd like to know if there's something I am missing, or it is indeed not worthy to try to boost Tx signal given this specific configuration.