Wireless Network for a Medium Size Company with one huge building

I have to setup a wireless for a company having huge 2-story building. I put 2 AP's of Linksys Business Router WRVS4400N on each floor but the users still complaint about the signal. Should I put more access points on each floor or is there any better solution from Cisco or some other company? Please help
sg2009Asked:
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DlegiaCommented:
Try to add an antenna on access points. This way the signal will be better
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sg2009Author Commented:
They already have an antenna. I am wondering if I should put more Access points. Typically, what is the range of each access point.
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sg2009Author Commented:
Do we need Wireless LAN Controller for multiple Access Points????? Please answer.
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nodiscoCommented:
hi

the range of any access point depends on a few factors when in a building - area / wall or ceiling blocking / signal interference.

Rather than use specs and statistics, your best bet is to turn on just one of them and get a laptop and go all around the area you wish to cover and see how the signal holds up.  Then boot another in an  overlapping area thats not receiving coverage etc.  Places that will cause interference with signal are powerful lighting, elevators, refridgeration units, comms room power etc
These areas can be difficult to cover.  

cisco do wireless lan controllers for multiple access points but realistically thats not what you need here.  A WLAN controller is a unit for managing several LWAPs (lightweight access points) - these sit on the LAN and are centrally managed from the controller - controllers are quite expensive and are aimed at Campus environments.

Your environment sounds like it just needs better coverage so you can add devices accordingly to ensure better signal.  There are devices like repeaters and signal boosters but considering the now lower cost of APs, it makes just as much sense to put in an access point where one is needed.

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