The Best of 2600 by Goldstein Emmanuel

Author:Goldstein, Emmanuel
Language: eng
Format: epub
Publisher: John Wiley & Sons, Inc.
Published: 2010-05-10T16:00:00+00:00

Enough, Phiber, now tell me about the switch!

OK, OK. The two most common GSM switches are the Ericsson AXE MSC, based on the AXE 10, and the Nortel DMS-MSC, based on the DMS SuperNode. MSC stands for Mobile Switching Center, which is what the switch is called in GSM lingo. The MSC is part of the network subsystem, and accesses four main databases: the Home Location Register (HLR), the Visitor Location Register (VLR), the Equipment Identity Register (EIR), and the Authentication Center (AUC). The VLR is commonly integrated with the MSC (e.g. the DMS-MSC), leaving the HLR, AUC, and EIR as a separate physical entity (e.g. the DMS-HLR). There is at least one HLR on every GSM network, and commonly multiple MSCs. The MSCs talk to other nodes on the GSM network using Signaling System No. 7 (SS7). Smaller GSM networks, which only serve a particular metropolitan area, may only have a couple of MSCs, which would talk directly to the PSTN (e.g. NYNEX, Bell Atlantic) using SS7. Larger GSM networks, which serve entire countries, make use of Gateway MSCs, or GMSCs, which may need to gain access to other parts of the GSM network over an SS7 capable PSTN, because it would be impractical to have the entire GSM network directly and privately interconnected. The MSC/VLR and HLR together handle roaming and call routing; the HLR also stores all valid IMSIs and MSISDNs, while the EIR stores all the valid IMEIs. This leaves the AUC, which stores all the valid Kis, generates pseudo-random numbers, and performs the A3 and A8 hashes for the network subsystem.

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.