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

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{{quiz-Header|Buchseite=Beispiele von Nachrichtensystemen/Allgemeine Beschreibung von DSL
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{{quiz-Header|Buchseite=Examples_of_Communication_Systems/General_Description_of_GSM
 
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[[File:|right|frame|]]
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[[File:EN_Bei_A_3_2.png|right|frame|List of GSM services ]]
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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.
  
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GSM services are divided into three categories:
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*Bearer services,
  
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===Fragebogen===
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*Tele services,
 +
 
 +
*Supplementary services.
 +
 
 +
 
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Basis for data transmission are the&nbsp; '''bearer services''',&nbsp; where the maximum data rate is&nbsp; $\text{9.6 kbits/s}$.
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'''Tele services'''&nbsp; are end-to-end services.&nbsp; The most important of these are:
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#the telephone service,
 +
#the fax service,
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#the short message service&nbsp; $\rm (SMS)$.
 +
 
 +
 
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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,
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#"call waiting",&nbsp; "hold"&nbsp;  and&nbsp; "conference call"&nbsp;  in phase 2,
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#"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"]].
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 +
 
 +
 
 +
 
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===Questions===
  
 
<quiz display=simple>
 
<quiz display=simple>
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{Multiple-Choice Frage
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{Which of the GSM services are the basis for data transmission?
 
|type="[]"}
 
|type="[]"}
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- Falsch
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+ bearer services,
−
+ Richtig
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- teleservices,
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- supplementary services.
  
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{What is the maximum data rate for GSM data transmission?
 +
|type="[]"}
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- $2.4 \ \rm kbit/s$.
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- $7.8 \ \rm kbit/s$.
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+ $9.6 \ \rm kbit/s$.
  
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{Input-Box Frage
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{Which statements are true for teleservices?
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|type="{}"}
+
|type="[]"}
−
$\alpha$ = { 0.3 }
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+ Tele services are end-to-end services.
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- A distinction is made between synchronous and asynchronous tele services.
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+ Examples are the telephone, fax and SMS services.
  
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{Which supplementary services originate from GSM phase 2?
 +
|type="[]"}
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- "Call Forwarding",
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+ "Call Waiting",
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- "General Packet Radio Service"&nbsp; $\rm (GPRS)$,
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+ "Conference Call"&nbsp; $\rm (CONF)$.
  
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{What technology is used in&nbsp; "High Speed Circuit-Switched Data"&nbsp; $\rm (HSCSD)$?
 +
|type="[]"}
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- Packet switching,
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+ circuit switching.
  
 
</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.
 +
 
 +
 
 +
 
 +
'''(3)'''&nbsp; Correct are the&nbsp; <u>proposed solutions 1 and 3</u>:
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*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.
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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 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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