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|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 sog. ''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).
 
  
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*Tele services,
  
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Grundlage für die Datenübertragung bilden die Trägerdienste, wobei die maximale Datenrate $9.6 \ \rm kbits/s$ 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) und ''Enhanced Data Rates for GSM Evolution'' in der Phase 2+.
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#the short message service  $\rm (SMS)$.
  
  
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''Hinweis:''
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Various  '''supplementary services'''  belong to each phase of GSM development:
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#"call display",  "call forwarding"  and  "caller ID"  in phase 1,
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Die Aufgabe bezieht sich auf [[Beispiele_von_Nachrichtensystemen/Allgemeine_Beschreibung_von_GSM|Allgemeine Beschreibung von GSM]].
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#"call waiting",  "hold"   and  "conference call"  in phase 2,
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===Fragebogen===
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#"GPRS",  "HSCSD",  "EDGE"  in phase 2+.
 +
 
 +
 
 +
<u>Hint:</u>&nbsp; The exercise belongs to the chapter&nbsp; [[Examples_of_Communication_Systems/General_Description_of_GSM|"General Description of GSM"]].
 +
 
 +
 
 +
 
 +
 
 +
 
 +
===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'' 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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- paketvermittelt,
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- Packet switching,
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+ eitungsvermittelt,
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+ circuit switching.
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- durchschaltevermittelt.
 
  
 
</quiz>
 
</quiz>
  
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===Musterlösung===
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===Solution===
 
{{ML-Kopf}}
 
{{ML-Kopf}}
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'''(1)'''&nbsp;  
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'''(2)'''&nbsp;  
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'''(1)'''&nbsp; Correct is the&nbsp; <u>proposed solution 1</u>:
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'''(3)'''&nbsp;  
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*Bearer services form the basis for data transmission.
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'''(4)'''&nbsp;  
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'''(5)'''&nbsp;  
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*They provide the technical means to transport data in a secured manner.
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'''(6)'''&nbsp;  
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'''(7)'''&nbsp;  
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 +
 
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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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 +
 
 +
 
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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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'''(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.
 +
 
 +
*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.
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{{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 18:58, 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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