Nokia-Siemens Networks will attempt to prove the Mobile WiMAX concept at NXTcomm this year, demonstrating mobile connectivity between its Flexi base station and a souped-up version of Nokia’s N770 Internet tablet.

The N770 is built for Wi-Fi connections, but Merji-Michael Khorchidian of NSN’s WiMAX technology marketing group said that NSN is optimizing the tablets for Mobile WiMAX to demonstrate the form factor and experience of WiMAX experience.

Nokia plans to release WiMAX handhelds in several designs in 2008, many of which will resemble the large-screen data-centric style of N770.