Difference between revisions of "Aufgaben:Exercise 3.2: GSM Services"

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{{quiz-Header|Buchseite=Beispiele von Nachrichtensystemen/Allgemeine Beschreibung von GSM
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{{quiz-Header|Buchseite=Examples_of_Communication_Systems/General_Description_of_GSM
 
}}  
 
}}  
  
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[[File:P_ID1188__Bei_A_3_2.png|right|frame|Auflistung der GSM-Dienste]]
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[[File:EN_Bei_A_3_2.png|right|frame|List of GSM services ]]
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Ein jedes ''Public Land Mobile Network'' (PLMN) muss die Festnetz–Infrastruktur und so genannte  ''Interworking Functions'' (IWF) zur Verfügung stellen. Nur so können die gewünschten Dienste an der Benutzerschnittstelle bereitgestellt werden.
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Any  "Public Land Mobile Network"  $\rm (PLMN)$  must provide the fixed network infrastructure and so-called  "interworking functions"  $\rm (IWF)$.  This is the only way to provide the desired services at the user interface.
  
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Die GSM–Dienste sind in drei Kategorien unterteilt:
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GSM services are divided into three categories:
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*''Bearer Services'' (Trägerdienste),
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*Bearer services,
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*''Tele Services'' (Teledienste),
 
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*''Supplementary Services'' (Zusatzdienste).
 
  
 +
*Tele services,
  
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Grundlage für die Datenübertragung bilden die Trägerdienste, wobei die maximale Datenrate 9.6 kbits/s beträgt.
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*Supplementary services.
  
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Teledienste sind Ende–zu–Ende–Dienste. Die wichtigsten davon sind:
 
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*der Telefondienst,
 
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*der Faxdienst,
 
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*der Kurznachrichtendienst.
 
  
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Basis for data transmission are the  '''bearer services''',  where the maximum data rate is  $\text{9.6 kbits/s}$.
  
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Zu jeder Phase der GSM–Entwicklung gehören verschiedene Zusatzdienste:
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'''Tele services'''  are end-to-end services.  The most important of these are:
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*Anrufanzeige, Rufumleitung und Rufnummernanzeige in der Phase 1,
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#the telephone service,
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*Anklopfen (''Call Waiting''), Halten (''Hold'') und Konferenzschaltung (''CONF'') in der Phase 2,
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#the fax service,
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*General Packet Radio Service (GPRS), High Speed Circuit–Switched Data (HSCSD), Enhanced Data Rates for GSM Evolution (EDGE) in der Phase 2+.
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#the short message service  $\rm (SMS)$.
  
  
 +
Various  '''supplementary services'''  belong to each phase of GSM development:
 +
#"call display",  "call forwarding"  and  "caller ID"  in phase 1,
 +
#"call waiting",  "hold"   and  "conference call"   in phase 2,
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#"GPRS",  "HSCSD",  "EDGE"  in phase 2+.
  
  
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<u>Hint:</u>&nbsp; The exercise belongs to the chapter&nbsp; [[Examples_of_Communication_Systems/General_Description_of_GSM|"General Description of GSM"]].
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''Hinweis:''
 
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*Die Aufgabe gehört zum Kapitel [[Beispiele_von_Nachrichtensystemen/Allgemeine_Beschreibung_von_GSM|Allgemeine Beschreibung von GSM]].
 
  
  
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===Fragebogen===
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===Questions===
  
 
<quiz display=simple>
 
<quiz display=simple>
  
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{Welche der GSM–Dienste bilden die Grundlage für die Datenübertragung?
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{Which of the GSM services are the basis for data transmission?
 
|type="[]"}
 
|type="[]"}
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+ Trägerdienste,
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+ bearer services,
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- Teledienste,
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- teleservices,
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- Zusatzdienste.
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- supplementary services.
  
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{Wie hoch ist die maximale Datenrate für die GSM–Datenübertragung?
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{What is the maximum data rate for GSM data transmission?
 
|type="[]"}
 
|type="[]"}
 
- $2.4 \ \rm kbit/s$.
 
- $2.4 \ \rm kbit/s$.
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+ $9.6 \ \rm kbit/s$.
 
+ $9.6 \ \rm kbit/s$.
  
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{Welche Aussagen sind für die Teledienste zutreffend?
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{Which statements are true for teleservices?
 
|type="[]"}
 
|type="[]"}
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+ Die Teledienste sind Ende–zu–Ende–Dienste.
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+ Tele services are end-to-end services.
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- Man unterscheidet synchrone und asynchrone Teledienste.
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- A distinction is made between synchronous and asynchronous tele services.
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+ Beispiele sind der Telefon–, der Fax– und der SMS–Dienst.
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+ Examples are the telephone, fax and SMS services.
  
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{Welche Zusatzdienste entstammen der GSM–Phase 2?
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{Which supplementary services originate from GSM phase 2?
 
|type="[]"}
 
|type="[]"}
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- Rufumleitung (''Call Forwarding''),
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- "Call Forwarding",
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+ Anklopfen (''Call Waiting''),
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+ "Call Waiting",
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- General Packet Radio Service (GPRS),
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- "General Packet Radio Service"&nbsp; $\rm (GPRS)$,
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+ Konferenzschaltung (CONF).
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+ "Conference Call"&nbsp; $\rm (CONF)$.
  
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{Welche Technik wird bei ''High Speed Circuit–Switched Data''  (HSCSD) verwendet?
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{What technology is used in&nbsp; "High Speed Circuit-Switched Data"&nbsp; $\rm (HSCSD)$?
 
|type="[]"}
 
|type="[]"}
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- Paketvermittlung,
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- Packet switching,
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+ Leitungsvermittlung,
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+ circuit switching.
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- Durchschaltevermittlung.
 
  
 
</quiz>
 
</quiz>
  
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===Musterlösung===
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===Solution===
 
{{ML-Kopf}}
 
{{ML-Kopf}}
  
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'''(1)'''&nbsp; Die Grundlagen für die Datenübertragung bilden die Trägerdienste $\Rightarrow$ <u>Vorschlag 1</u>. Sie stellen die technischen Möglichkeiten bereit, um Daten gesichert zu transportieren.
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'''(1)'''&nbsp; Correct is the&nbsp; <u>proposed solution 1</u>:
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*Bearer services form the basis for data transmission.
 +
 +
*They provide the technical means to transport data in a secured manner.
 +
 
 +
 
 +
 
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'''(2)'''&nbsp; Correct is the&nbsp; <u>proposed solution 3</u>:
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*The maximum data rate for GSM data transmission is&nbsp; $9.6 \rm kbit/s$.
 +
 +
*There are synchronous and asynchronous as well as circuit-switched and packet-switched data transmission.
 +
 
 +
 
 +
 
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'''(3)'''&nbsp; Correct are the&nbsp; <u>proposed solutions 1 and 3</u>:
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*Proposition 2 is incorrect:
 +
 
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*The terms&nbsp; "synchronous"&nbsp; and&nbsp; "asynchronous"&nbsp; play a role only in connection with bearer services.
 +
 
 +
 
 +
 
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'''(4)'''&nbsp; Correct are the&nbsp; <u>proposed solutions 2 and 4</u>:
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*In contrast,&nbsp; "call forwarding"&nbsp; belongs to GSM phase 1 and&nbsp; "General Packet Radio Service"&nbsp; $\rm (GPRS)$&nbsp; to phase 2+.
  
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'''(2)'''&nbsp; Die maximale Datenrate für GSM–Datenübertragung ist $9.6 \ \rm kbit/s \Rightarrow$ <u>Vorschlag 3</u>. Es gibt dabei synchrone und asynchrone sowie leitungs– und paketvermittelte Datenübertragung.
 
  
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'''(3)'''&nbsp; Richtig sind die <u>Aussagen 1 und 3</u>. Die Aussage 2 ist falsch: Die Begriffe „synchron” und „asynchron” spielen nur in Zusammenhang mit den Trägerdiensten eine Rolle.
 
  
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'''(4)'''&nbsp; Richtig sind die <u>Antworten 2 und 4</u>. Dagegen gehört die Rufumleitung zur GSM–Phase 1 und ''General Packet Radio Service'' (GPRS) zur Phase 2+.
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'''(5)'''&nbsp; Correct is the&nbsp; <u>proposed solution 2</u>:
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*"High Speed Circuit-Switched Data"&nbsp; $\rm (HSCSD)$&nbsp; was introduced as a circuit-switched transmission technology.
  
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'''(5)'''&nbsp; ''High Speed Circuit–Switched Data'' (HSCSD) wurde als leitungsvermittelte Übertragungstechnik eingeführt, während ''General Packet Radio Service'' (GPRS) paketvermittelt arbeitet und ''Enhanced Data Rate for GSM Evolution'' (EDGE) als durchschaltevermittelter Datendienst bezeichnet werden kann $\Rightarrow$ <u>Vorschlag 2</u>.
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*In contrast,&nbsp; "General Packet Radio Service"&nbsp; $\rm (GPRS)$&nbsp; operates as packet-switched and&nbsp; "Enhanced Data Rate for GSM Evolution"&nbsp; $\rm (EDGE)$&nbsp; can be described as circuit-switched data service.
  
 
{{ML-Fuß}}
 
{{ML-Fuß}}
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[[Category:Aufgaben zu Beispiele von Nachrichtensystemen|^3.1 Allgemeine Beschreibung von GSM
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[[Category:Examples of Communication Systems: Exercises|^3.1 General Description of GSM
 
^]]
 
^]]

Latest revision as of 17:58, 7 January 2023

List of GSM services

Any  "Public Land Mobile Network"  $\rm (PLMN)$  must provide the fixed network infrastructure and so-called  "interworking functions"  $\rm (IWF)$.  This is the only way to provide the desired services at the user interface.

GSM services are divided into three categories:

  • Bearer services,
  • Tele services,
  • Supplementary services.


Basis for data transmission are the  bearer services,  where the maximum data rate is  $\text{9.6 kbits/s}$.

Tele services  are end-to-end services.  The most important of these are:

  1. the telephone service,
  2. the fax service,
  3. the short message service  $\rm (SMS)$.


Various  supplementary services  belong to each phase of GSM development:

  1. "call display",  "call forwarding"  and  "caller ID"  in phase 1,
  2. "call waiting",  "hold"  and  "conference call"  in phase 2,
  3. "GPRS",  "HSCSD",  "EDGE"  in phase 2+.


Hint:  The exercise belongs to the chapter  "General Description of GSM".



Questions

1

Which of the GSM services are the basis for data transmission?

bearer services,
teleservices,
supplementary services.

2

What is the maximum data rate for GSM data transmission?

$2.4 \ \rm kbit/s$.
$7.8 \ \rm kbit/s$.
$9.6 \ \rm kbit/s$.

3

Which statements are true for teleservices?

Tele services are end-to-end services.
A distinction is made between synchronous and asynchronous tele services.
Examples are the telephone, fax and SMS services.

4

Which supplementary services originate from GSM phase 2?

"Call Forwarding",
"Call Waiting",
"General Packet Radio Service"  $\rm (GPRS)$,
"Conference Call"  $\rm (CONF)$.

5

What technology is used in  "High Speed Circuit-Switched Data"  $\rm (HSCSD)$?

Packet switching,
circuit switching.


Solution

Solution

(1)  Correct is the  proposed solution 1:

  • Bearer services form the basis for data transmission.
  • They provide the technical means to transport data in a secured manner.


(2)  Correct is the  proposed solution 3:

  • The maximum data rate for GSM data transmission is  $9.6 \rm kbit/s$.
  • There are synchronous and asynchronous as well as circuit-switched and packet-switched data transmission.


(3)  Correct are the  proposed solutions 1 and 3:

  • Proposition 2 is incorrect:
  • The terms  "synchronous"  and  "asynchronous"  play a role only in connection with bearer services.


(4)  Correct are the  proposed solutions 2 and 4:

  • In contrast,  "call forwarding"  belongs to GSM phase 1 and  "General Packet Radio Service"  $\rm (GPRS)$  to phase 2+.


(5)  Correct is the  proposed solution 2:

  • "High Speed Circuit-Switched Data"  $\rm (HSCSD)$  was introduced as a circuit-switched transmission technology.
  • In contrast,  "General Packet Radio Service"  $\rm (GPRS)$  operates as packet-switched and  "Enhanced Data Rate for GSM Evolution"  $\rm (EDGE)$  can be described as circuit-switched data service.

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