New PDF release: GSM: Switching, Services and Protocols

By Joerg Eberspaecher, Hans-Joerg Voegel, Christian Bettstetter

ISBN-10: 0470841745

ISBN-13: 9780470841747

ISBN-10: 047149903X

ISBN-13: 9780471499039

GSM (Global procedure for cellular conversation) is presently utilized in greater than a hundred nations for cellular telephony and its program is progressively expanding in various assorted components. Comprehensively revised and up-to-date, this moment version of a hugely winning textual content comprises the most recent advances within the box. New positive aspects include:? thoroughly revised and improved bankruptcy "GSM - What next?"? New bankruptcy on common Packet Radio provider (GPRS)? improved part on UMTS? up to date chapters on Logical Channels and Channel CodingTaking an instructive method of the subject, the authors specialize in the basics of cellular radio platforms, overlaying the criteria and protocols largely, and supply a superb advent to this speedily evolving subject, from GSM radio transmission via to overseas roaming to cellular information companies and community management.Offering huge assurance of this cutting edge subject, this article could turn out to be a worthy reference source for telecommunications engineers, researchers and builders; senior undergraduates and postgraduate scholars of telecommunications.

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Additional info for GSM: Switching, Services and Protocols

Example text

2). 8) are standard transmission lines. 544 Mbit/s in North America) are typically used (®xed lines, mostly microwave links or leased lines). The BSS uses mostly 64 kbit/s lines. Signaling has two fundamentally different parts: GSM-speci®c signaling within the BSS, including the air interface, and signaling within the SMSS and with other PLMN in conformity with Signalling System Number 7 (SS#7). User data connections are processed with an SS#7 protocol for signaling between network nodes, the ISDN User Part (ISUP).

This updating of the HLR occurs through the D interface. The D interface is used for the exchange of location-dependent subscriber data and for subscriber management. The VLR informs the HLR about the current location of the mobile subscriber and reports the current MSRN. The HLR transfers all the subscriber data to the VLR that is needed to give the subscriber his or her usual customized service access. The HLR is also responsible for giving a cancellation request for the subscriber data to the old VLR once the acknowledgement for the location update arrives from the new VLR.

The LAI is requested from the VLR if the connection for an incoming call has been routed to the current MSC using the MSRN. This determines the precise location of the mobile station where the mobile can be subsequently paged. When the mobile station answers, the exact cell and therefore also the base station become known; this information can then be used to switch the call through. 6 Temporary Mobile Subscriber Identity (TMSI) The VLR being responsible for the current location of a subscriber can assign a Temporary Mobile Subscriber Identity (TMSI), which has only local signi®cance in the area handled by the VLR.

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GSM: Switching, Services and Protocols by Joerg Eberspaecher, Hans-Joerg Voegel, Christian Bettstetter

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