Aufgaben:Exercise 3.2: GSM Services: Difference between revisions

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{{quiz-Header|Buchseite=Beispiele von Nachrichtensystemen/Allgemeine Beschreibung von DSL
{{quiz-Header|Buchseite=Examples_of_Communication_Systems/General_Description_of_GSM
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[[File:|right|frame|]]
[[File:EN_Bei_A_3_2.png|right|frame|List of GSM services ]]
Any&nbsp; "Public Land Mobile Network"&nbsp; $\rm (PLMN)$&nbsp; must provide the fixed network infrastructure and so-called&nbsp; "interworking functions"&nbsp; $\rm (IWF)$.&nbsp; This is the only way to provide the desired services at the user interface.


GSM services are divided into three categories:
*Bearer services,


===Fragebogen===
*Tele services,
 
*Supplementary services.
 
 
Basis for data transmission are the&nbsp; '''bearer services''',&nbsp; where the maximum data rate is&nbsp; $\text{9.6 kbits/s}$.
 
'''Tele services'''&nbsp; are end-to-end services.&nbsp; The most important of these are:
#the telephone service,
#the fax service,
#the short message service&nbsp; $\rm (SMS)$.
 
 
Various&nbsp; '''supplementary services'''&nbsp; belong to each phase of GSM development:
#"call display",&nbsp; "call forwarding"&nbsp; and&nbsp; "caller ID"&nbsp; in phase 1,
#"call waiting",&nbsp; "hold"&nbsp;  and&nbsp; "conference call"&nbsp;  in phase 2,
#"GPRS",&nbsp; "HSCSD",&nbsp; "EDGE"&nbsp; 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>
{Multiple-Choice Frage
 
{Which of the GSM services are the basis for data transmission?
|type="[]"}
|type="[]"}
- Falsch
+ bearer services,
+ Richtig
- teleservices,
- supplementary services.


{What is the maximum data rate for GSM data transmission?
|type="[]"}
- $2.4 \ \rm kbit/s$.
- $7.8 \ \rm kbit/s$.
+ $9.6 \ \rm kbit/s$.


{Input-Box Frage
{Which statements are true for teleservices?
|type="{}"}
|type="[]"}
$\alpha$ = { 0.3 }
+ 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.


{Which supplementary services originate from GSM phase 2?
|type="[]"}
- "Call Forwarding",
+ "Call Waiting",
- "General Packet Radio Service"&nbsp; $\rm (GPRS)$,
+ "Conference Call"&nbsp; $\rm (CONF)$.


{What technology is used in&nbsp; "High Speed Circuit-Switched Data"&nbsp; $\rm (HSCSD)$?
|type="[]"}
- Packet switching,
+ circuit switching.


</quiz>
</quiz>


===Musterlösung===
===Solution===
{{ML-Kopf}}
{{ML-Kopf}}
'''(1)'''&nbsp;  
 
'''(2)'''&nbsp;  
'''(1)'''&nbsp; Correct is the&nbsp; <u>proposed solution 1</u>:
'''(3)'''&nbsp;  
*Bearer services form the basis for data transmission.
'''(4)'''&nbsp;  
'''(5)'''&nbsp;  
*They provide the technical means to transport data in a secured manner.
'''(6)'''&nbsp;  
 
'''(7)'''&nbsp;  
 
 
'''(2)'''&nbsp; Correct is the&nbsp; <u>proposed solution 3</u>:
*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.
 
 
 
'''(3)'''&nbsp; Correct are the&nbsp; <u>proposed solutions 1 and 3</u>:
*Proposition 2 is incorrect:
 
*The terms&nbsp; "synchronous"&nbsp; and&nbsp; "asynchronous"&nbsp; play a role only in connection with bearer services.
 
 
 
'''(4)'''&nbsp; Correct are the&nbsp; <u>proposed solutions 2 and 4</u>:
*In contrast,&nbsp; "call forwarding"&nbsp; belongs to GSM phase 1 and&nbsp; "General Packet Radio Service"&nbsp; $\rm (GPRS)$&nbsp; to phase 2+.
 
 
 
'''(5)'''&nbsp; Correct is the&nbsp; <u>proposed solution 2</u>:
*"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.
 
{{ML-Fuß}}
{{ML-Fuß}}






[[Category:Aufgaben zu Beispiele von Nachrichtensystemen|^3.1 Allgemeine Beschreibung von GSM
[[Category:Examples of Communication Systems: Exercises|^3.1 General Description of GSM
^]]
^]]
[[de:Aufgaben:Aufgabe 3.2: GSM–Dienste]]

Latest revision as of 17:53, 16 March 2026

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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