Nokia Siemens Networks has announced two new network partnerships with Australia's Optus and TeliaSonera International Carrier.

Optus has chosen the Finland-based vendor to modernise its mobile network and re-farm the 900 MHz GSM frequency.

The deal will also cover the provision of infrastructure and services for the Long Term Evolution (LTE) 4G roll-out in Sydney and Perth, with NSN becoming Optus's only LTE core provider.

NSN's head of Australia and New Zealand, Stephen McFeeley, said: "Spectrum is a scarce resource, so operators are seeking ways to make the best use of it.

"With this deal, Optus will re-use its existing spectrum to modernise its radio network and also offer 4G services cost-efficiently in one of the largest spectrum migration programmes globally."

Meanwhile, NSN has announced the development of a new optical overlay network, deployed across Europe by TeliaSonera International Carrier, to cope with growing volumes of data traffic.

This project is designed to offer speeds of more than 100G via dense wave division multiplexing.

However, Mikko Lavanti, NSN's head of optical networks customer sales and support, said the network has the potential to be upgraded to 400G and beyond.

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