By Joerg Eberspaecher, Hans-Joerg Voegel, Christian Bettstetter
Because the e-book of the 1st variation the variety of GSM subscribers has exploeded and it's now deployed in additional than a hundred and forty international locations around the world. Revised and up to date GSM Switching, companies and Protocols now good points the considerable new providers and purposes that GSM provides. by means of targeting the basics of the cellular radio platforms, it presents a very good introductory perception to the full quarter of GSM mobile radio. by way of delivering an easy-to-follow instructive textual content, this moment variation may have perception entice telecommunication engineers, researchers, adn builders. The hugely graphical process and various illustrations also will make it an essential reference for senior undergraduates and postgraduates in electric and machine engineering.
– info the GSM section 2+ prone, together with new facts and speech prone and repair systems, reminiscent of AMR, ASCI. CAMEL and EFR – encompasses a fresh bankruptcy on normal Packet Radio provider (GPRS) – features a completly revised and improved bankruptcy 'GSM - the tale is going on' – provides new sections on instant program Protocol (WAP) and the migration to UMTS – comprises expaned and up-to-date chapters on Logical Channels and Channel Coding
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Extra resources for GSM: switching, services, and protocols
The keys serve for user authentication and authorize the respective service access. The Equipment Identity Register (EIR) stores the serial numbers (supplied by the manufacturer) of the terminals (IMEI), which makes it possible to check for mobile stations with obsolete software or to block service access for mobile stations reported as stolen. 4 Subscriber Data in GSM Besides data of the address type, which is the most important subscriber data of any communication network, a whole series of other service- and contract-speci®c data exists in GSM networks.
The contents of such contracts are stored in appropriate data structures in order to enable correct realization or provision of these services. 7. Subscriber-related addresses are stored on the SIM and in the HLR and VLR as well. These data (IMSI, MSISDN, TMSI, MSRN) serve to address, identify, and localize a subscriber or a mobile station. 4 41 Subscriber Data in GSM data items, TMSI and MSRN are temporary values, which change according to the current location of the subscriber. Of the other data items de®ned for user or network equipment elements (like IMEI, LAI, or SPCs), only some are used (LAI, SPC) for localizing or routing.
This leaves some scope for development of future services when each subscriber may be called personally, independent of reachability or type of connection (mobile or ®xed). Besides the personal identi®er, each GSM subscriber is assigned one or several ISDN numbers. Besides telephone numbers and subscriber and equipment identi®ers, several other identi®ers have been de®ned; they are needed for the management of subscriber mobility and for addressing all the remaining network elements. The most important addresses and identi®ers are presented in the following.