I would disable DHCP in your phone and put a static ip.
Hold down on the network name till a windows pops up then go on Modify Network>Show Advanced Options>Ip Settings>Static
IP Address: 192.168.x.128 (The X depends on what range your router is. Just do an ipconfig on your laptop to see, 1 is the most commonly used)
Gateway: 192.168.x.x (That is your router address do ipconfig on your laptop to find the 'Default Gateway'
DNS 1: 192.168.x.x (Same as the router as most routers have their own DNS)
DNS 2: 126.96.36.199 (I normally put google's :P)