Hi Manshoon,
In establishing a good wireless coverage, make sure to put the router in a higher location or in a less interference area. The E2500 router doesn't have the capability to extend the wireless signal. What I can suggest is try changing wireless channels. You can use an application that will help you determine which channel is perfect for your network. Changing channels will avoid interference or conflict on any other devices that might cause getting a low signal. You can also update the router's firmware for better performance.