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Power efficiencies of 800MHz vs 1800MHz 4g |
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#1 |
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Forum Member
Join Date: Jan 2013
Posts: 105
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Power efficiencies of 800MHz vs 1800MHz 4g
Hi, as the title suggests, are their any power savings on a mobile using 800MHz 4g vs 1800MHz and higher frequencies or do they work out around the same?
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#2 |
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Inactive Member
Join Date: Jan 2007
Posts: 3,286
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No network currently has both 800 and 1800 right now so it's hard to say. Comparing between different networks is a bit fishy because of different network configurations, so far I find 800Mhz networks use *more* power.
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#3 |
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Join Date: Jan 2013
Posts: 105
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Quote:
No network currently has both 800 and 1800 right now so it's hard to say. Comparing between different networks is a bit fishy because of different network configurations, so far I find 800Mhz networks use *more* power.
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#4 |
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Inactive Member
Join Date: Jan 2007
Posts: 3,286
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In theory, yes, but because it's different networks operating with different settings and different hardware, it's hard to compare directly.
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#5 |
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Forum Member
Join Date: Jul 2013
Posts: 249
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The rf transmissions of the handset are a pretty minimal part of the power used TBH, so I wouldn't expect the frequency to make any noticeable difference to the overall battery life used.
The power is really used in the signal processing which is independent of the frequency, and is the main reason that LTE takes more juice than 3G, and then 3G more than 2G, e.g the actual maximum handset radio transmission power allowed is actually 4 times higher on GSM than on 3G or 4G. |
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#6 |
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Inactive Member
Join Date: Jan 2007
Posts: 3,286
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Well, 2G has a higher instantaneous limit but you can't really compare it since with TDMA and DTX it's only transmitting a fraction of the time, well less than 1/4, so the average RF power output isn't 4 times higher.
Then again most handsets these days are a lot more efficient than before and consume a total of <1w when transcieving on 3G, so the RF can become a significant fraction (30-50%) of the total power consumption. |
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#7 |
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Forum Member
Join Date: Jul 2013
Posts: 249
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Quote:
Well, 2G has a higher instantaneous limit but you can't really compare it since with TDMA and DTX it's only transmitting a fraction of the time, well less than 1/4, so the average RF power output isn't 4 times higher.
Then again most handsets these days are a lot more efficient than before and consume a total of <1w when transcieving on 3G, so the RF can become a significant fraction (30-50%) of the total power consumption. If you want to save battery life, a black background is the way to go! http://www.researchgate.net/profile/...4f1ac8816c.pdf |
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#8 |
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Join Date: Mar 2000
Location: This forum
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Quote:
If you want to save battery life, a black background is the way to go!
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#9 |
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Forum Member
Join Date: Jan 2013
Posts: 105
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Quote:
Especially on OLED / AMOLED screens.
And I'd rater not suffer a constantly degrading screen thanks |
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#10 |
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Forum Member
Join Date: Mar 2001
Location: North West
Posts: 4,884
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Quote:
ERM and totally pointless if you have and LCD screen :L
And I'd rater not suffer a constantly degrading screen thanks |
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#11 |
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Forum Member
Join Date: Jan 2013
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Of course but the difference between a uniform degradation and a patchy smeared mess is quite striking and not something I'm willing to except for £500 +
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#12 |
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Forum Member
Join Date: Jan 2013
Posts: 105
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Also samold screens can show signs of degradation within 2 months of use which is something you just don't find with lcd
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