Ofcom: 4G won't knock out granny's personal alarm

Ofcom has been looking at how 4G networks will interfere with the short-range devices next door, and concludes that LTE handsets haven't the power or capacity to generate significant interference. According to the study carried out by the regulator (PDF, surprisingly readable) LTE devices are too conscientious in their power …

[Anonymous Coward]

autumn ?

and the odds of the auction actualy taking place in late 2012 ?

a) non-existent.

b)bloody unlikely.

[Matt 21]

It's all very well

to make some tests and guess but they should force the manufacturers to meet these guesses.

[bigdish]

LTE Pedantry

Just a bit of technical pedantry ....

'Both the handset and the base station measure each other's signals and let each other know when it's OK to reduce the power' - not in LTE, only the uplink is power controlled, no downlink power control is used

'time-sliced' - sort of but not in the strictly organised way that, say, GSM is

'code-divided' - nope, not in LTE, not for user plane channels anyway.

Most of the OOB protection in this case is provided by the 'brick wall' effect of the upper guard band of null subcarriers on the upper edge of the channel, this leads to a steep dropoff in radiated power in the adjacent band. Plus the fact that the base station is unlikely to assign Resource Blocks on the edges of channels to distant phones (which would be expected to transmit the strongest uplink signals) to reduce the amount of interference caused to neighbouring cells.