Using mobiles in an aeroplane... NOT dangerous after all! (apparently)

Clueless2 wrote:
Yes, point taken. BTW what is the typical message size of a MMS message and
what logical channels are used to deliver a MMS message?

MMS is done through GPRS connections. You get a short message notifying you of
availability of a message containing X and and Z of size XX. YOu can then
choose to download that message, at which point it uses GPRS links. (which
means actual "voice" links instead of control signals which are used for the
SMS messages).

Not sure whether the initial MMS notification is done through SMS or GPRS
channels though.

Clueless2 wrote:
Yes, point taken. BTW what is the typical message size of a MMS message and
what logical channels are used to deliver a MMS message?

MMS is done through GPRS connections. You get a short message notifying you of
availability of a message containing X and and Z of size XX. YOu can then
choose to download that message, at which point it uses GPRS links. (which
means actual "voice" links instead of control signals which are used for the
SMS messages).

Not sure whether the initial MMS notification is done through SMS or GPRS
channels though.

Clueless2 wrote:
Yes, point taken. BTW what is the typical message size of a MMS message and
what logical channels are used to deliver a MMS message?

MMS is done through GPRS connections. You get a short message notifying you of
availability of a message containing X and and Z of size XX. YOu can then
choose to download that message, at which point it uses GPRS links. (which
means actual "voice" links instead of control signals which are used for the
SMS messages).

Not sure whether the initial MMS notification is done through SMS or GPRS
channels though.

In uk.telecom.mobile Clueless2 no.spam wrote:
"Ian Stirling" wrote in message
...
Or when recieving an MMS/email/..., if set to do this, as many phones
do nowadays.

Yes, point taken. BTW what is the typical message size of a MMS message and
what logical channels are used to deliver a MMS message?

On reading a nokia manual recently, it went on about how videos of over
150K couldn't be sent as MMS, which could easily be a couple of minutes.

Emails can of course be megabytes.

In uk.telecom.mobile Clueless2 no.spam wrote:
"Ian Stirling" wrote in message
...
Or when recieving an MMS/email/..., if set to do this, as many phones
do nowadays.

Yes, point taken. BTW what is the typical message size of a MMS message and
what logical channels are used to deliver a MMS message?

On reading a nokia manual recently, it went on about how videos of over
150K couldn't be sent as MMS, which could easily be a couple of minutes.

Emails can of course be megabytes.

The "idle mode" [practically] doesn't exist in an aircraft, since it's
trying to find a base station (and if it finds one, will be continually
switching, due to interference). The pulsing mode of radiation is definitely
more dangerous to aircraft systems as RFI than the "call mode", but the
cell-switching will still occur.

At least you have a bit of a clue...

"Clueless2" no.spam wrote in message
...
"Jim Ley" wrote in message
...
But phones are always on in flights - I've hardly been on a plane
where someone I'm sitting near hasn't realised they'd left there phone
on upon arrival, so if they genuine thought there was a risk, they'd
actually do something about it.

Leaving a GSM mobile phone on in a flight (in idle mode) is quite
different
to using a GSM mobile phone (in dedicated mode) in a flight.

In idle mode the phone only sends 4 bursts to perform a location update
every time it crosses a location area, whereas in dedicated mode it is
transmitting most of the time!




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"AC" wrote in message
...
The "idle mode" [practically] doesn't exist in an aircraft, since it's
trying to find a base station (and if it finds one, will be continually
switching, due to interference). The pulsing mode of radiation is
definitely
more dangerous to aircraft systems as RFI than the "call mode", but the
cell-switching will still occur.

Not necessarily, assuming the MS is camped on its home network at take-off,
it will remain in idle mode waking up to listen to its assigned paging
channel and also to perform surronding cell measurements. None of these
activities would require the transmitter to be activated, only the receiver.
When the MS thinks it has crossed a location area it will transmit a
location-upate message (ISTR this is four bursts). Of course if the MS
thinks it is leaving its home PLMN and entering into a roaming PLMN, then it
will need to re-authenticate with the roaming PLMN which will require many
more than 4 bursts!

"AC" wrote in message
...
The "idle mode" [practically] doesn't exist in an aircraft, since it's
trying to find a base station (and if it finds one, will be continually
switching, due to interference). The pulsing mode of radiation is
definitely
more dangerous to aircraft systems as RFI than the "call mode", but the
cell-switching will still occur.

Not necessarily, assuming the MS is camped on its home network at take-off,
it will remain in idle mode waking up to listen to its assigned paging
channel and also to perform surronding cell measurements. None of these
activities would require the transmitter to be activated, only the receiver.
When the MS thinks it has crossed a location area it will transmit a
location-upate message (ISTR this is four bursts). Of course if the MS
thinks it is leaving its home PLMN and entering into a roaming PLMN, then it
will need to re-authenticate with the roaming PLMN which will require many
more than 4 bursts!

On Sat, 16 Oct 2004 04:45:26 GMT, "JamesUK"
wrote:
Try and keep up. The issue is cell phones communicating with base stations.
Over oceans this is not possible.


A flight from UK to Jo'burg though would be almost entirely over land.

On Fri, 15 Oct 2004 18:48:05 +0200, Tom Peel
wrote:
Quote your source?


I got it on some Google News Alert thingie... I have since deleted all
my cache but I'll try and dig it out.