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

From LNTwww
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[[File:EN_Bei_A_3_2.png|right|frame|List of GSM services ]]
 
[[File:EN_Bei_A_3_2.png|right|frame|List of GSM services ]]
Any  ''Public Land Mobile Network''  (PLMN) must provide the fixed network infrastructure and so-called  ''Interworking Functions''  (IWF). This is the only way to provide the desired services at the user interface.
+
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:
 
GSM services are divided into three categories:
*''Bearer Services'',
+
*Bearer services,
*''Tele Services'',
 
*''Supplementary Services''.
 
  
 +
*Tele services,
  
The basis for data transmission is the carrier services, where the maximum data rate is $\text{9.6 kbits/s}$ .
+
*Supplementary services.
  
Teleservices are end-to-end services. The most important of these are:
 
*the telephone service,
 
*the fax service,
 
*the short message service  (SMS).
 
  
 +
Basis for data transmission are the  '''bearer services''',  where the maximum data rate is  $\text{9.6 kbits/s}$.
  
Various ancillary services belong to each phase of GSM development:
+
'''Tele services'''  are end-to-end services.  The most important of these are:
*call display, call forwarding and caller ID in phase 1,
+
#the telephone service,
*call waiting, hold  (''Hold'')  and conference call  (''CONF'')  in phase 2,
+
#the fax service,
*General Packet Radio Service  (GPRS), High Speed Circuit-Switched Data  (HSCSD), Enhanced Data Rates for GSM Evolution  (EDGE) in phase 2+.
+
#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,
 +
#"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"]].
Hint:
 
 
*The exercise belongs to the chapter&nbsp; [[Examples_of_Communication_Systems/General_Description_of_GSM|"General Description of GSM"]].
 
  
  
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{Which statements are true for teleservices?
 
{Which statements are true for teleservices?
 
|type="[]"}
 
|type="[]"}
+ Teleservices are end-to-end services.
+
+ Tele services are end-to-end services.
- A distinction is made between synchronous and asynchronous teleservices.
+
- A distinction is made between synchronous and asynchronous tele services.
 
+ Examples are the telephone, fax and SMS services.
 
+ Examples are the telephone, fax and SMS services.
  
{Which additional services originate from GSM phase 2?
+
{Which supplementary services originate from GSM phase 2?
 
|type="[]"}
 
|type="[]"}
- Call Forwarding,
+
- "Call Forwarding",
+ Call Waiting,
+
+ "Call Waiting",
- General Packet Radio Service&nbsp; (GPRS),
+
- "General Packet Radio Service"&nbsp; $\rm (GPRS)$,
+ Conference Call&nbsp; (CONF).
+
+ "Conference Call"&nbsp; $\rm (CONF)$.
  
{What technology is used in&nbsp; ''High Speed Circuit-Switched Data''&nbsp; (HSCSD)?
+
{What technology is used in&nbsp; "High Speed Circuit-Switched Data"&nbsp; $\rm (HSCSD)$?
 
|type="[]"}
 
|type="[]"}
 
- Packet switching,
 
- Packet switching,

Revision as of 17:51, 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

(1)  Correct is the proposed solution 1:

  • Carrier 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 proposed solutions 1 and 3:

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


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

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


(5)  Correct is the proposed solution 2:

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