Telenor has delivered report to the Norwegian Post and Telecommunication Authority.
(Thomson Reuters ONE) -
(Fornebu, Norway - 16 June 2011) Telenor on Thursday handed in a report to the
Norwegian Post and Telecommunications Authority where the company informs of the
breakdown that affected the mobile network in Norway on Friday 10 June. The
report also accounts for measures implemented to prevent similar errors from
reoccurring.
"This is the most extensive breakdown that Telenor has experienced since the
mobile network was established in 1993 and the demand for information is huge.
We have now composed a report, which will answer the questions posed by the
authorities. We will also continue the dialogue with the authorities to ensure
that everybody get he answers they need," said CEO of Telenor Norway, Ragnar
Kårhus
Restart created interruptions
Telenor's report shows that the error occurred in connection with a restart and
software upgrade on a centrally located server for mobile broadband. The server
was restarted because of interruptions that affected some customers.
Right after the restart problems were detected in large parts of the national
mobile traffic. Telenor's surveillance systems showed that the traffic between
servers in the mobile network increased far beyond normal levels. This internal
traffic between servers is called signalling traffic. The increased signalling
traffic continued to increase to the extent that the servers no longer managed
to connect calls and SMSes to recipients.
"When looking for faults we had indications that the controlled restart of the
server for mobile broadband could have triggered the problems, but it was not
clear how this could affect the voice traffic. It is not normal that a restart
creates such heavy signalling traffic between network servers, which we
experienced Friday. The signalling traffic also created disturbances in several
network units and it therefore became difficult and time consuming to localize
the cause of the breakdown and have it corrected," said Ragnar Kårhus.
The network back to normal around midnight
Comprehensive fault correction attempts were immediately implemented several
places in the network. During the search, and attempts at correction,
technicians found that a particular voice server was especially overloaded. The
server in question was disconnected and then reconfigured. The situation then
gradually improved in the entire mobile network. It was then decided to conduct
the same procedure for all voice servers in the network. After this work was
finalised around midnight on Friday, the situation returned to normal.
Measures implemented
Telenor now believes that the signalling traffic increased far more than normal
after the reconfiguration, due to the fact that the signalling level in the
network was already high. Telenor has already implemented a number of measures
to protect against similar events in the future.
"Primarily, we have increased the capacity in the network. In addition, we have
established protective mechanisms that come into force if abnormal increases in
signalling traffic occur. Along with several other measures, this has reduced
the likelihood that we will be facing the same kind of situation that we
experienced on June 10," said Ragnar Kårhus.
Telenor will also conduct a complete analysis of the design of the mobile
network, and will also have the network structure evaluated by
externals.
Contact:
Torild Uribarri, Chief Communication Officer Telenor Norway, Tel:
+47 911 55 381,torild.uribarri(at)telenor.com
Anders Krokan, Communication Manager, Tel: +
47 952 09 037,anders.krokan(at)telenor.com
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Source: Telenor via Thomson Reuters ONE
[HUG#1523889]
Unternehmensinformation / Kurzprofil:
Datum: 16.06.2011 - 11:01 Uhr
Sprache: Deutsch
News-ID 55614
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"Telenor has delivered report to the Norwegian Post and Telecommunication Authority."
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