DS Forums

 
 

Power efficiencies of 800MHz vs 1800MHz 4g


Reply
Thread Tools Search this Thread
Old 01-05-2014, 05:10
Ashley_Bradbury
Forum Member
 
Join Date: Jan 2013
Posts: 105

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?
Ashley_Bradbury is offline   Reply With Quote
Please sign in or register to remove this advertisement.
Old 01-05-2014, 15:43
qasdfdsaq
Inactive Member
 
Join Date: Jan 2007
Posts: 3,286
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.
qasdfdsaq is offline   Reply With Quote
Old 01-05-2014, 16:02
Ashley_Bradbury
Forum Member
 
Join Date: Jan 2013
Posts: 105
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.
Ah ok, I was just wondering if the lower frequency would allow a lower transmit power from the handset.
Ashley_Bradbury is offline   Reply With Quote
Old 01-05-2014, 16:17
qasdfdsaq
Inactive Member
 
Join Date: Jan 2007
Posts: 3,286
In theory, yes, but because it's different networks operating with different settings and different hardware, it's hard to compare directly.
qasdfdsaq is offline   Reply With Quote
Old 01-05-2014, 19:37
RAN Man
Forum Member
 
Join Date: Jul 2013
Posts: 249
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.
RAN Man is offline   Reply With Quote
Old 01-05-2014, 19:56
qasdfdsaq
Inactive Member
 
Join Date: Jan 2007
Posts: 3,286
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.
qasdfdsaq is offline   Reply With Quote
Old 01-05-2014, 20:55
RAN Man
Forum Member
 
Join Date: Jul 2013
Posts: 249
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.
True enough. 3G power control is also (by necessity) much more aggressive and will always transmit at just above the minimum power required. Quite an interesting paper below, which doesn't split the 2G/3G into RF and other components but does show 3G takes on average twice the power of GSM for a voice call.

If you want to save battery life, a black background is the way to go!

http://www.researchgate.net/profile/...4f1ac8816c.pdf
RAN Man is offline   Reply With Quote
Old 01-05-2014, 21:36
jchamier
Forum Member
 
Join Date: Mar 2000
Location: This forum
Posts: 3,389
If you want to save battery life, a black background is the way to go!
Especially on OLED / AMOLED screens.
jchamier is offline   Reply With Quote
Old 01-05-2014, 23:09
Ashley_Bradbury
Forum Member
 
Join Date: Jan 2013
Posts: 105
Especially on OLED / AMOLED screens.
ERM and totally pointless if you have and LCD screen :L

And I'd rater not suffer a constantly degrading screen thanks
Ashley_Bradbury is offline   Reply With Quote
Old 02-05-2014, 03:09
Aye Up
Forum Member
 
Join Date: Mar 2001
Location: North West
Posts: 4,884
ERM and totally pointless if you have and LCD screen :L

And I'd rater not suffer a constantly degrading screen thanks
Actually you will find all screens degrade after time.....whether SLCD, IPS , AMOLED and so on....
Aye Up is offline Follow this poster on Twitter   Reply With Quote
Old 02-05-2014, 05:32
Ashley_Bradbury
Forum Member
 
Join Date: Jan 2013
Posts: 105
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 +
Ashley_Bradbury is offline   Reply With Quote
Old 02-05-2014, 05:34
Ashley_Bradbury
Forum Member
 
Join Date: Jan 2013
Posts: 105
Also samold screens can show signs of degradation within 2 months of use which is something you just don't find with lcd
Ashley_Bradbury is offline   Reply With Quote
 
Reply




 
Forum Jump


All times are GMT. The time now is 17:38.