Optus gets 520Mbps speeds on 4G TD-LTE network

Optus gets 520Mbps speeds on 4G TD-LTE network

Summary: Optus combined four 20MHz spectrum bands on its TD-LTE network in a test in Western Sydney that saw the network achieve speeds of over 500Mbps.

TOPICS: Telcos, 4G, Optus, Huawei

Optus and its 4G network vendor Huawei have tested out combining four 20MHz spectrum bands in the 2.3GHz spectrum band using time-division duplex long-term evolution (TD-LTE) to achieve 520Mbps download speeds on Optus' 4G network.

Optus' managing director of networks Vic McClelland said the test of 4G carrier aggregation on the live TD-LTE network was the first in the world conducted on a fully operational commercial network.

FD-LTE, which most networks operate on in Australia in the 1800MHz band, has dedicated slots for uploads and downloads, while TD-LTE uses the entire spectrum allocated to it for both downloads and uploads, separated by time.

Optus has been using its TD-LTE network in Canberra to deliver 4G services in Australia's capital, but has recently been testing out using the TD-LTE network in combination with the FD-LTE network in other parts of Australia to increase capacity in high-density areas such as CBDs.

The company announced today that in the LTE-Advanced trial conducted in St Marys, Optus was able to achieve download speeds of 520Mbps by combining four 20MHz spectrum bands in the 2.3GHz band. In a Melbourne test combining two channels, Optus achieved peak download speeds of 160Mbps to a single user.

"In Melbourne, we've paired two channels in the same frequency band, on our 4G Plus network, which we expect to provide the consistent speed experience that customers want and expect from 4G networks of the future," McClelland said in a statement.

At the same time, Optus' biggest rival Telstra has been testing out LTE-Advanced, where the company has been able to achieve peak download speeds of 300Mbps using spectrum in the 1800MHz and 900MHz spectrum bands.

McClelland said that the company expects LTE-A compatible devices to likely enter the market in early 2014.

"This is about ensuring that Optus continues to build a mobile network that keeps pace with the ongoing evolution of 4G devices," McClelland said.

Optus' network partner Huawei said it expects to launch compatible devices in 2014, and the company already has approximately 80 TD-LTE compatible devices today.

Topics: Telcos, 4G, Optus, Huawei


Armed with a degree in Computer Science and a Masters in Journalism, Josh keeps a close eye on the telecommunications industry, the National Broadband Network, and all the goings on in government IT.

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  • When there are real users?

    Will be interesting to see what speeds are obtainable with multiple users on the network.

    We keep getting headline speed announcements without capacity information.
  • Headline Speed

    Of course the average speed is going to be lower, but peak speed is still relevant for most internet browsing as it's so asynchronous and asymmetric.

    Even on NBN fibre it's still shared infrastructure with your neighbours.
    Andy Grace
    • 'Bye to Line rental?

      My landline at presentl can only supply 0.2Mbps on ADSL2.
      Now that Turnbull's delivery & performance revised FTTN elephant is turning paler daily & no longer promises to provide me with a "Faster & Cheaper 25Mbps by 2016" worthwhile boost over the next 5 years.
      Perhaps it's time to go 100% mobile?
      • 100% with you

        I'm thinking it's time to give the whole NBN the heave ho. The 25Mbps is silly as we have that already just about everywhere already and HFC is potentially about 5 times as fast even today.
        Anyone within a few hundred metres of a 4G tower should get 25Mbps.
        Andy Grace
      • Download speed

        Has anyone thought about this. While the speed is great at 50 megabytes per second the most expensive phone plan that optus has only gives you 3 gigabyte per month. At 50 megabyte per second what are you going to do for the rest of the month after the first minute.
  • NSN built network

    Wondering why NSN is not mentioned here when they have deployed both the radio equipment and the EPC.