Difference between revisions of "Aufgaben:Exercise 3.5Z: GSM Network Components"

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'''(1)'''&nbsp; Jede Mobilstation (MS) steht mit einer ''Base Transceiver Station'' (BTS) in Funkverbindung. Diese ist Teil des ''Base Station Subsystems'' (BSS) &nbsp; &rArr; &nbsp; <u>Lösungsvorschlag 1</u>.
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'''(1)'''&nbsp; Each mobile station (MS) is in communication with a base transceiver station (BTS). This is part of the ''Base Station Subsystem'' (BSS) &nbsp; &rArr; &nbsp; <u>solution 1</u>.
  
  
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'''(2)'''&nbsp; Richtig sind die <u>Aussagen 1 und 3</u>. Dagegen ist die ''Base Transceiver Station'' nicht für Vermittlungsaufgaben zuständig, sondern dies ist die Aufgabe eines ''Mobile Switching Centers'' (MSC), das einen Teil des ''Switching and Management Subsystems'' (SMSS) darstellt.
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'''(2)'''&nbsp; Correct are the <u>statements 1 and 3</u>. In contrast, the base transceiver station is not responsible for switching tasks, but this is rather the task of a mobile switching center (MSC), which is part of the switching and management subsystem (SMSS).
  
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'''(3)'''&nbsp;If, as is usually the case with GSM, the individual antennas cover $120^\circ$ sectors, a BTS can provide up to three connection paths  &nbsp; &rArr; &nbsp;  $N_{\rm max} \hspace{0.15cm}\underline{= 3}$.
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'''(3)'''&nbsp; Wenn wie meist bei GSM die einzelnen Antennen $120^\circ$–Sektoren abdecken, so kann eine BTS bis zu drei Verbindungswege bereitstellen  &nbsp; &rArr; &nbsp;  $N_{\rm max} \hspace{0.15cm}\underline{= 3}$.
 
  
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'''(4)'''&nbsp; Only the Operation and Management Center (OMC) belongs to the OMSS &nbsp; &rArr; &nbsp; <u> Proposal 3</u> .
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*In contrast, MSC and GMSC are components of the mobile switching network (SMSS).
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*With regard to OMC, a distinction is made between OMC-B (for BSS monitoring) and OMC-S (for SMSS monitoring).
  
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'''(4)'''&nbsp; Nur das Operation and Management Center (OMC) gehört zum OMSS  &nbsp; &rArr; &nbsp; <u> Vorschlag 3</u> .
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'''(5)'''&nbsp; <u>solutions 1, 3 und 4</u> are correct:
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*Dagegen sind MSC und GMSC Komponenten des Mobilvermittlungsnetzes (SMSS).
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*The ''Gateway Mobile Switching Center'' (GMSC) is a hardware unit that is responsible for switching between the fixed network and the mobile network.  
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*Bezüglich des OMC unterscheidet man schließlich noch zwischen OMC–B (zur BSS–Überwachung) und OMC–S (zur SMSS–Überwachung).
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*The other three terms given actually describe databases of the ''Switching & Management Subsystem'' (SMSS).
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* The ''Authentication Center'' (AUC) is responsible for the storage of confidential data and keys.  
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* The Home Location Register (HLR) is a central register for the entire Public Land Mobile Network (PLMN) for managing unencrypted subscriber data, subscribed services and routing for calls from a mobile operator's own subscribers.  
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'''(5)'''&nbsp; <u>Lösungsvorschläge 1, 3 und 4</u>:
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*Contrary, the Visitors' Location Register (VLR) contains information about the current visitors of other operators who are located in the current PLMN.
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*Das ''Gateway Mobile Switching Center'' (GMSC) ist eine Hardware-Einheit, die für die Vermittlung zwischen dem Festnetz und dem Mobilnetz zuständig ist.  
 
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*Die drei anderen angegebenen Begriffe beschreiben tatsächlich Datenbanken des ''Switching & Management Subsystem'' (SMSS).
 
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* Das ''Authentication Center'' (AUC) ist für die Speicherung  von vertraulichen Daten und Schlüsseln verantwortlich.  
 
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* Das ''Home Location Register'' (HLR) ist ein Zentralregister für das gesamte ''Public Land Mobile Network'' (PLMN) zur Verwaltung unverschlüsselter Telnehmerdaten, der abonnierten Dienste und zur Wegesuche für Rufe der eigenen Teilnehmer eines Mobilfunkbetreibers.  
 
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*Dagegen sind im Besucherregister (VLR) die Informationen über die momentanen Besucher anderer Betreiber abgelegt, die sich im aktuellen PLMN befinden.
 
  
  

Revision as of 16:03, 2 July 2020

„Base Station Subsystem” of GSM

For the mobile phone standard  Global System for Mobile Communications  - abbreviated  GSM - the network infrastructure includes the following subsystems:

  • Base Station Subsystem   (BSS),
  • Switching & Management Subsystem   (SMSS),
  • Operation & Maintenance Subsystem   (OMSS).

The  Base Station Subsystem  is mainly responsible for the GSM radio network (see diagram), while the  Switching & Management Subsystem  represents the switching network and the  Operation & Maintenance Subsystem  is responsible for operation and maintenance.

The following terms will continue to be used in the questions on these tasks:

  • Authentication Center   (AUC)
  • Base Station Controller   (BSC),
  • Base Transceiver Station   (BTS),
  • Gateway Mobile Switching Center   (GMSC),
  • Home Location Register   (HLR),
  • Mobile Switching Center   (MSC),
  • Operation and Maintenance Center   (OMC),
  • Visitor Location Register   (VLR).




Notes:



Fragebogen

1

With which of the three subsystems does the mobile station communicate?

With the BSS,
the SMSS,
the OMSS.

2

Which statements apply to a Base Transceiver Station (BTS)?

It includes the base station's transmitting and receiving devices.
The task of the BTS is to switch calls.
In most cases, several BTS are subordinate to a common BSC.

3

How many links can a BTS with multiple antennas support if each antenna covers a sector of  $120^\circ$ ?

$N_{\rm max}\ = \ $

4

Which of the following components are part of the OMSS?

The GMSC
The MSC
The OMC

5

Which of the following components are databases?

The AUC
The GMSC
The HLR
The VLR


Sample Solution

Solution

(1)  Each mobile station (MS) is in communication with a base transceiver station (BTS). This is part of the Base Station Subsystem (BSS)   ⇒   solution 1.


(2)  Correct are the statements 1 and 3. In contrast, the base transceiver station is not responsible for switching tasks, but this is rather the task of a mobile switching center (MSC), which is part of the switching and management subsystem (SMSS).

(3) If, as is usually the case with GSM, the individual antennas cover $120^\circ$ sectors, a BTS can provide up to three connection paths   ⇒   $N_{\rm max} \hspace{0.15cm}\underline{= 3}$.


(4)  Only the Operation and Management Center (OMC) belongs to the OMSS   ⇒   Proposal 3 .

  • In contrast, MSC and GMSC are components of the mobile switching network (SMSS).
  • With regard to OMC, a distinction is made between OMC-B (for BSS monitoring) and OMC-S (for SMSS monitoring).

(5)  solutions 1, 3 und 4 are correct:

  • The Gateway Mobile Switching Center (GMSC) is a hardware unit that is responsible for switching between the fixed network and the mobile network.
  • The other three terms given actually describe databases of the Switching & Management Subsystem (SMSS).
  • The Authentication Center (AUC) is responsible for the storage of confidential data and keys.
  • The Home Location Register (HLR) is a central register for the entire Public Land Mobile Network (PLMN) for managing unencrypted subscriber data, subscribed services and routing for calls from a mobile operator's own subscribers.
  • Contrary, the Visitors' Location Register (VLR) contains information about the current visitors of other operators who are located in the current PLMN.


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