Difference between revisions of "Aufgaben:Exercise 3.2: GSM Services"
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| − | [[File: | + | [[File:EN_Bei_A_3_2.png|right|frame|List of GSM services ]] |
| − | Any | + | 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, |
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| − | |||
| + | *Tele services, | ||
| − | + | *Supplementary services. | |
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| + | 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"]]. | |
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| − | Hint: | ||
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{Which statements are true for teleservices? | {Which statements are true for teleservices? | ||
|type="[]"} | |type="[]"} | ||
| − | + | + | + Tele services are end-to-end services. |
| − | - A distinction is made between synchronous and asynchronous | + | - 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 | + | {Which supplementary services originate from GSM phase 2? |
|type="[]"} | |type="[]"} | ||
| − | - Call Forwarding, | + | - "Call Forwarding", |
| − | + Call Waiting, | + | + "Call Waiting", |
| − | - General Packet Radio Service (GPRS), | + | - "General Packet Radio Service" $\rm (GPRS)$, |
| − | + Conference Call (CONF). | + | + "Conference Call" $\rm (CONF)$. |
| − | {What technology is used in | + | {What technology is used in "High Speed Circuit-Switched Data" $\rm (HSCSD)$? |
|type="[]"} | |type="[]"} | ||
- Packet switching, | - Packet switching, | ||
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{{ML-Kopf}} | {{ML-Kopf}} | ||
| − | '''(1)''' Correct is the <u>proposed solution 1</u>: | + | '''(1)''' Correct is the <u>proposed solution 1</u>: |
| − | * | + | *Bearer services form the basis for data transmission. |
| + | |||
*They provide the technical means to transport data in a secured manner. | *They provide the technical means to transport data in a secured manner. | ||
| − | '''(2)''' Correct is the <u>proposed solution 3</u>: | + | '''(2)''' Correct is the <u>proposed solution 3</u>: |
| − | *The maximum data rate for GSM data transmission is $9.6 \rm kbit/s$. | + | *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. | *There are synchronous and asynchronous as well as circuit-switched and packet-switched data transmission. | ||
| − | '''(3)''' Correct are <u>proposed solutions 1 and 3</u>: | + | '''(3)''' Correct are the <u>proposed solutions 1 and 3</u>: |
| − | *Proposition 2 is incorrect: The terms | + | *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. | |
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| − | *In contrast, | ||
{{ML-Fuß}} | {{ML-Fuß}} | ||
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:
- 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.
