R700 is a 3x3x:3 AP, means it will provide highest data rate when a compatible client is connected on 5GHz on 80MHz channel.
Data rate also depends upon so many factors like, RF noise/interference, type of material used in physical environment where APs are deployed, multipath, etc.
Start checking with supported data rates on the UE WiFi card specification and how many spacial streams it supports. Then check if AP is configured with 80MHz channelization and client is connecting on 5GHz.
For example, my laptop's wifi card only supports 2x2 antenna chains and it can go upto 867Mbps on 5GHz radio.
If I try to connect my laptop to an AP, which support gigbit speed, still I cannot cross the maximum supported speed by the client device WiFi card.