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Analyst Fingers NSN Server for Verizon's 4G FailAnalyst Fingers NSN Server for Verizon's 4G Fail

Morgan Keegan analyst suggests that Verizon LTE outage was caused by NSN server in the new network

Dan Jones

April 28, 2011

1 Min Read
Analyst Fingers NSN Server for Verizon's 4G Fail

One analyst suggests that the Verizon Wireless 4G Long Term Evolution (LTE) outage was caused by a Nokia Networks element in the IMS system that manages subscriber activity on the network. (See Verizon Investigating LTE Outage.)

Simon M. Leopold of Morgan Keegan & Company Inc. put out a research note Thursday afternoon that suggests that the daylong 4G outage was caused by a server that became unstable under heavy loads:

  • Our checks indicate that a team from Verizon and its key vendors including Alcatel-Lucent (NYSE: ALU), Ericsson AB (Nasdaq: ERIC) and Nokia Siemens Networks (NSN) pulled together and came up with a work around over night. Our checks suggest the problem resides deep in the network core and involves difficulties authenticating devices as they attempt to connect to the network. We suspect the overload relates to the HSS, the Home Subscriber Service, which is part of the IP Multimedia Subsystem (IMS). We believe the IMS solution comes from NSN. The infrastructure from Alcatel-Lucent and Ericsson seem as if they are functioning properly.

The HSS server holds all the user information related to preferences, subscriptions, location and authorization needed by the network to manage the subscribers as they move around on the 4G network. It is broadly similar to a Home Location Registrar (HLR) in a 3G network set-up.

Verizon Wireless had no comment when LR Mobile asked about the analyst note on Thursday.

— Dan Jones, Site Editor, Light Reading Mobile

About the Author(s)

Dan Jones

Mobile Editor

Dan is to hats what Will.I.Am is to ridiculous eyewear. Fedora, trilby, tam-o-shanter -- all have graced the Jones pate during his career as the go-to purveyor of mobile essentials.

But hey, Dan is so much more than 4G maps and state-of-the-art headgear. Before joining the Light Reading team in 2002 he was an award-winning cult hit on Broadway (with four 'Toni' awards, two 'Emma' gongs and a 'Brian' to his name) with his one-man show, "Dan Sings the Show Tunes."

His perfectly crafted blogs, falling under the "Jonestown" banner, have been compared to the works of Chekhov. But only by Dan.

He lives in Brooklyn with cats.

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