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July 30, 2008

On July 8th, M2Z Networks argued that broadband operations in the 2155-2180 MHz spectrum band designated by the FCC for its free lifeline service should not be permitted because those operations would cause interference for its current operations.

But now M2Z's argument may lose some of its relevance thanks to findings about its network in the Czech Republic.

T-Mobile has long argued that TDD (time division duplex) technology would be disruptive if deployed in the U.S., adjacent to its FDD (frequency division duplex) operations in AWS-1 due to mobile-to-mobile interference.

However, in the Czech Republic, T-Mobile's broadband wireless deployment does use TDD technology but in an unpaired spectrum band that is adjacent to paired FDD operations without special protections or limits to guard against mobile-to-mobile interference.

M2Z Networks has pointed out that T-Mobile is currently providing broadband services in the Czech Republic using similar spectrum and similar technical rules to those that the FCC plans to adopt for the free broadband service.

So according to the report from the Czech Telecommunications Office, T-Mobile's broadband service is operating with well-established standard power limits and without having to use spectrum guard bands at all.

John Muleta, CEO of M2Z Networks said “as a former FCC official, I'm also particularly troubled and very concerned by T-Mobile's selective presentation of information at the FCC about state-of-the-art wireless technology and interference management."

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Source: M2Z Networks.