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ZTE has successfully completed a hand-over test between twodifferent versions of LTE, allowing operators to more effectivelyuse their spectrum in a way that is seamless to the end user, thecompany said on Thursday. The test was carried out using a network from ZTE and a dual-modeUSB modem from the Hong Kong Applied Science and TechnologyResearch Institute (ASTRI). In this case, dual-mode equals support for both LTE FDD(Frequency-Division Duplex) and TDD (Time-Division Duplex). Thelatter sends download and upload traffic over one channel, whileFDD uses two channels, one for downloading and one for uploadingdata. By using LTE FDD and TDD at the same time operators can offerhigher speeds to more users, according to Richard Webb, directinganalyst for microwave, mobile offload, and mobile broadband devicesat Infonetics Research. "I certainly think that greater interoperability between the twotechnologies will give operators more flexibility when deployingLTE," said Webb. An operator could also use the two versions for different services,according to Webb. For example, LTE TDD is a good fit for videostreaming -- since operators can choose to dedicate more spectrumto downlink traffic -- and the LTE FDD network can handle Webtraffic. To date, operators have been given a fairly small amount of FDDspectrum, so some of them are also looking at using TDD spectrum toboost capacity, according to Webb. But what they don't want to endup with is two separate networks, and ZTE's test seems to show thatoperators can avoid that, he said. The test showed that when the modem is connected to the network andlarge files are downloaded, the success rate of the hand-over canbe up to 100 percent, according to ZTE. Also, the quality of theconnection was not affected, the company said. The goal with ZTE's test was to show how the user experience can beimproved when an operator uses both versions of LTE. Most of today's commercial LTE networks use FDD, but there arenetworks of the TDD variety in Poland, Saudi Arabia, Brazil, Japanand India, according to industry organization GSA (Global mobileSuppliers Association). Big proponents of LTE TDD include Clearwireand China Mobile. Last year, the first network to use both LTE FDD and TDD wasunveiled in Sweden by ZTE and Hi3G. How many other operators decideto follow remains to be seen. ZTE didn't say when the functionality will become available incommercial networks, only saying that "as a next step, ZTE islooking to deploy this technology in its launched networks." Send news tips and comments to mikael_ricknas@idg.com. We are high quality suppliers, our products such as Urinary Bag , Elastic Bandage for oversee buyer. To know more, please visits Urinary Bag.
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