Difference between revisions of "Aufgaben:Exercise 3.2: GSM Services"
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− | {{quiz-Header|Buchseite= | + | {{quiz-Header|Buchseite=Examples_of_Communication_Systems/General_Description_of_GSM |
}} | }} | ||
− | [[File:|right|frame|]] | + | [[File:EN_Bei_A_3_2.png|right|frame|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: | ||
+ | #the telephone service, | ||
+ | #the fax service, | ||
+ | #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+. | ||
+ | |||
+ | |||
+ | <u>Hint:</u> The exercise belongs to the chapter [[Examples_of_Communication_Systems/General_Description_of_GSM|"General Description of GSM"]]. | ||
+ | |||
+ | |||
+ | |||
+ | |||
+ | |||
+ | ===Questions=== | ||
<quiz display=simple> | <quiz display=simple> | ||
− | { | + | |
+ | {Which of the GSM services are the basis for data transmission? | ||
|type="[]"} | |type="[]"} | ||
− | - | + | + bearer services, |
− | + | - teleservices, | |
+ | - supplementary services. | ||
+ | {What is the maximum data rate for GSM data transmission? | ||
+ | |type="[]"} | ||
+ | - $2.4 \ \rm kbit/s$. | ||
+ | - $7.8 \ \rm kbit/s$. | ||
+ | + $9.6 \ \rm kbit/s$. | ||
− | { | + | {Which statements are true for teleservices? |
− | |type=" | + | |type="[]"} |
− | + | + 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" $\rm (GPRS)$, | ||
+ | + "Conference Call" $\rm (CONF)$. | ||
+ | {What technology is used in "High Speed Circuit-Switched Data" $\rm (HSCSD)$? | ||
+ | |type="[]"} | ||
+ | - Packet switching, | ||
+ | + circuit switching. | ||
</quiz> | </quiz> | ||
− | === | + | ===Solution=== |
{{ML-Kopf}} | {{ML-Kopf}} | ||
− | '''(1)''' | + | |
− | '''(2)''' | + | '''(1)''' Correct is the <u>proposed solution 1</u>: |
− | '''(3)''' | + | *Bearer services form the basis for data transmission. |
− | '''(4)''' | + | |
− | '''(5)''' | + | *They provide the technical means to transport data in a secured manner. |
− | + | ||
− | + | ||
+ | |||
+ | '''(2)''' Correct is the <u>proposed solution 3</u>: | ||
+ | *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 <u>proposed solutions 1 and 3</u>: | ||
+ | *Proposition 2 is incorrect: | ||
+ | |||
+ | *The terms "synchronous" and "asynchronous" play a role only in connection with bearer services. | ||
+ | |||
+ | |||
+ | |||
+ | '''(4)''' Correct are the <u>proposed solutions 2 and 4</u>: | ||
+ | *In contrast, "call forwarding" belongs to GSM phase 1 and "General Packet Radio Service" $\rm (GPRS)$ to phase 2+. | ||
+ | |||
+ | |||
+ | |||
+ | '''(5)''' Correct is the <u>proposed solution 2</u>: | ||
+ | *"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. | ||
+ | |||
{{ML-Fuß}} | {{ML-Fuß}} | ||
− | [[Category: | + | [[Category:Examples of Communication Systems: Exercises|^3.1 General Description of GSM |
^]] | ^]] |
Latest revision as of 17:58, 7 January 2023
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:
- the telephone service,
- the fax service,
- 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+.
Hint: The exercise belongs to the chapter "General Description of GSM".
Questions
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.