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Forums › New Zealand Broadband › UFB Vs LTE
crackrdbycracku

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#123175 27-Jun-2013 10:43
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OK, please forgive me if this is the stupidest question ever posed on Geekzone but here goes. 

The UFB project aims at 100 mbit/s speed and requires the digging up of most of the country to lay cables which is very difficult because of the geology and geography. 

An LTE (often called 4G) network aims to deliver 100 mbit/s speed down and 50 mbit/s up and requires the building of towers which sit above the ground. 

Both networks probably deliver the 100 mbit/s when you switch them on due to the number of people on the network and a lot of other reasons. 

So, why are we, as in the government funded by tax payers, building a UFB network and not an LTE network? Or a bit of both? 




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antoniosk
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  #845989 27-Jun-2013 11:03
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crackrdbycracku: OK, please forgive me if this is the stupidest question ever posed on Geekzone but here goes. 

The UFB project aims at 100 mbit/s speed and requires the digging up of most of the country to lay cables which is very difficult because of the geology and geography. 

An LTE (often called 4G) network aims to deliver 100 mbit/s speed down and 50 mbit/s up and requires the building of towers which sit above the ground. 

Both networks probably deliver the 100 mbit/s when you switch them on due to the number of people on the network and a lot of other reasons. 

So, why are we, as in the government funded by tax payers, building a UFB network and not an LTE network? Or a bit of both? 


Radio networks are shared by all users in the coverage area, and a typical radio segment could have up to 2000 users registered at any one time. The airside speed could burst to 100mbps with LTE for example, but if everyone in the area hammered on the cell you would get a lot less than 100mbps. 

UFB Fibre as being deployed now (using the mature GPON technology) means each connection can jump to 100mbps, but the constraint occurs further - the first place where all fibres are connected together, then the junction of all the junctions and so on. In theory  if you make the backhaul transmission large enough all along the way, then all the fibres would get increased bandwidth. This doesn't happen on radio as it's being deployed, and is just not economical to scale to the levels of wired networks.... not least of which the amount of antenna's and base stations that would be required would be a proper planning nightmare.

In practise UFB also has constraints built into it, which is the CIR (Committed Information Rate), set at about 2.5mbps. This applies when there is congestion. But neither LTE or UFB are congested yet - 'empty network syndrome' - so speeds are rocking by comparison   Cool

That's the nature of radio; the constraint occurs in the pure access layer, although it is improving with every release of technology. 




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