At 10:40 AM +0100 2005-07-11, [EMAIL PROTECTED] wrote:
Some of the problems on the mobile networks were the
result of a protocol to reserve mobile capabilities for
the emergency services. The police have the authority to
switch cells to emergency service and then people with
specially registered SIM cards in their mobile can
take priority. Presumably, some amount of capacity is
also held in reserve for these people as well.
Yes, a certain amount of capacity can be placed on reserve for
the holders of priority access SIMs. You only get those issued to
you by the government. This can include critical emergency services
personnel, selected government officials, important members of the
financial services community, etc....
I don't know the specifics of how much capacity is reserved, but
this sort of thing has been done on telecommunications networks for a
long time. Back before cell phones existed, you could have "flash"
traffic on the DDN or even the PSTN, and when placing a flash call
the phone system would disconnect anyone that stood in your way of
getting the connection you wanted.
You had to be using special telephone equipment, or connected to
a special operator with the right equipment, and you had damn well
better be sure that your call was worthy of knocking anyone else off
the network, but the capability was there. Even the President would
normally make his calls at lower than "flash" priority.
There were lower levels of priority that you could also use, but
"flash" was the top one that I heard about.
I had moved the weekend before and my landline was not
yet installed. Also, I live near a large hospital. I noticed
that my mobile didn't function at all even late on Thursday
unless I left home and travelled a kilometer or two from
the hospital. Presumably, the cells in this suburban
location had also been switched to emergency service.
Could be, but I'd be willing to bet it was more a matter of the
cell just being overloaded. Traffic reservation for priority access
SIMs is only going to take a small amount of the bandwidth available.
The problem is that even normal heavy traffic can overload a cell,
and what was seen during the time you're talking about was anything
but "normal heavy".
--
Brad Knowles, <[EMAIL PROTECTED]>
"Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety."
-- Benjamin Franklin (1706-1790), reply of the Pennsylvania
Assembly to the Governor, November 11, 1755
SAGE member since 1995. See <http://www.sage.org/> for more info.
