The head of Clearwire said last week that the telecoms industry should focus on bringing WiMax and LTE closer together.

Like WiMax, TD-LTE uses the same radio channel for data transfer in either direction between the mobile phone and the network. For most consumers, the operator allocates more time for downloads from network to phone.

In pure LTE, there is a dedicated channel for each direction, which means that the uploading channel from mobile phone to network ends up largely underutilised.

Major mobile telephone operators see LTE as a natural way to boost their networks' data-carrying capacity as some of their equipment can be upgraded with just new software, unlike WiMax, which needs a new network to be built.

At the same time, there are enough technical similarities between TD-LTE and LTE, easing its use for operators. Operators are also attracted by availability and lower price of TD-LTE spectrum.

"There is a lot of it, and not a lot of it is claimed yet," said Stephane Daeuble, LTE marketing chief at Motorola.

BETAMAX OF MOBILE SPACE?

Last year Nokia's sales chief Anssi Vanjoki forecast for WiMax a future similar to that of Betamax, which lost the battle for video recording standard to VHS in 1980s.

"WiMax is a great idea, but with no market support. They came with innovation, but someone else will capitalise on it," said Fabricio Martinez, consulting practice director at Aircom.

Mobile WiMax has raised awareness for mobile broadband services and boosted demand among operators and consumers, but lacked support from the top telecom gear firms.

Ironically WiMax networks pushed traditional mobile technology firms to rush the development of LTE networks, and the time when WiMax was the only solution for operators to help to ease data surge in their networks has passed.

"WiMax missed the train," said Bengt Nordstrom, chief executive of Stockholm-based telecoms consultancy Northstream.

While for Intel the failure of WiMax is merely a public relations defeat, for some smaller companies, bets on the technology have cost much more. Finnish electronics firm Elektrobit switched its focus to WiMax a few years ago, and has struggled to survive ever since.

Analysts and industry sources say all key LTE suppliers are also best positioned to win deals for TD-LTE. Sweden's Ericsson, market leader in mobile telecom equipment, has invested heavily in LTE, while Nokia Siemens Networks and Huawei are also seen as winners in the technology shift.

The first commercial trial of TD-LTE will start in May in Shanghai with Motorola and Huawei supplying key equipment, and Alcatel-Lucent and Datang also providing some technology.