Difference between revisions of "Aufgaben:Exercise 3.1: Development of the Mobile Network"
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| − | {{quiz-Header|Buchseite= | + | {{quiz-Header|Buchseite=Mobile_Communications/History_and_Development_of_Mobile_Communication_Systems |
}} | }} | ||
| − | [[File:P_ID2214__Mob_A_3_1.png|right|frame| | + | [[File:P_ID2214__Mob_A_3_1.png|right|frame|Terms and abbreviations <br>of mobile radio]] |
| − | + | First mobile communication systems came onto the market in the mid to late 1950s, in Germany for example the "A–Netz". | |
However, the devices of that time cannot be compared with today's mobile phones in any way, either in terms of performance, volume or even more so in terms of weight. | However, the devices of that time cannot be compared with today's mobile phones in any way, either in terms of performance, volume or even more so in terms of weight. | ||
| − | Since the early 1980s, the development of mobile communications technology has progressed rapidly. Approximately every ten years, there have been significant changes in technology, performance and the services offered. | + | Since the early 1980s, the development of mobile communications technology has progressed rapidly. Approximately every ten years, there have been significant changes in technology, performance and the services offered. |
| − | The fourth generation $\ | + | The fourth generation [[Mobile_Communications/General_Information_on_the_LTE_Mobile_Communications_Standard |$\rm LTE$ ]] (Long Term Evolution) of mobile communications was specified in 2008 with UMTS Release 8 and has also been available in Germany since around 2013, although it is not yet available nationwide today (2017). |
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''Notes:'' | ''Notes:'' | ||
| − | *The task belongs to the chapter [[Mobile_Communications/ | + | *The task belongs to the chapter [[Mobile_Communications/History_and_Development_of_Mobile_Communication_Systems|History and Development of Mobile Communication Systems]]. |
| − | *In the diagram some terms and abbreviations of mobile radio are shown. There is no direct reference to the task. | + | *In the diagram some terms and abbreviations of mobile radio are shown. There is no direct reference to the task. |
*The colors indicate that the systems belong to the first, second and third generation of mobile radio. | *The colors indicate that the systems belong to the first, second and third generation of mobile radio. | ||
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<quiz display=simple> | <quiz display=simple> | ||
| − | {Which statements apply to first generation mobile radio systems? | + | {Which statements apply to first generation $\rm (1G)$ mobile radio systems? |
|type="[]"} | |type="[]"} | ||
+ These enable voice transmission. | + These enable voice transmission. | ||
- These enable data transmission. | - These enable data transmission. | ||
| − | - These are | + | - These are fully digitized systems. |
| − | + | + | + $\rm 1G$ includes AMPS and the German "C–Netz". |
| − | {What is the case for second generation mobile communications systems? | + | {What is the case for second generation mobile communications systems $\rm (2G)$? |
|type="[]"} | |type="[]"} | ||
| − | + | + | + These enable voice transmission. |
| − | + | + | + These enable data transmission. |
| − | + | + | + These are fully digitized systems. |
+ The second generation includes GSM, PDC and DECT. | + The second generation includes GSM, PDC and DECT. | ||
| − | - All 2G systems operate on frequencies around 2 GHz. | + | - All $\rm 2G$ systems operate on frequencies around 2 GHz. |
| − | {What are mobile radio systems of the "GSM phase 2+ | + | {What are mobile radio systems of the "GSM phase $\rm (2+)$"? |
|type="[]"} | |type="[]"} | ||
+ They offer better voice quality than 2G systems. | + They offer better voice quality than 2G systems. | ||
| − | + They offer a higher data rate than | + | + They offer a higher data rate than 2G systems. |
+ The extensions HSCSD, GPRS and EDGE are included. | + The extensions HSCSD, GPRS and EDGE are included. | ||
- They also include HSDPA and HSUPA. | - They also include HSDPA and HSUPA. | ||
| − | {Which statements apply to third | + | {Which statements apply to third generation mobile radio systems $\rm (3G)$? |
|type="[]"} | |type="[]"} | ||
- The main advantage is the better voice quality. | - The main advantage is the better voice quality. | ||
+ The data rate is sufficient for "mobile internet". | + The data rate is sufficient for "mobile internet". | ||
+ The best known representative of 3G systems is UMTS. | + The best known representative of 3G systems is UMTS. | ||
| − | - The 3G | + | - The 3G standard "LTE" brings further improvements. |
</quiz> | </quiz> | ||
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| − | === | + | ===Solution=== |
{{ML-Kopf}} | {{ML-Kopf}} | ||
| − | '''(1)''' | + | '''(1)''' Correct are the <u>proposals 1 and 4</u>: |
| − | * | + | *The first generation of mobile communications $\rm (1G)$ offers only analog voice transmission. |
| − | * | + | *In addition to the systems mentioned above, ACS, NMT, TACS, RTMS and RC2000 are also included in the first generation of mobile communications <br>(marked in red in the graphic in the data section). |
| − | * | + | *They all came onto the market in the early to mid of the 1980s. |
| + | |||
| + | '''(2)''' Correct are the <u>proposals 1 to 4</u>: | ||
| + | *The best known $\rm 2G$ representative is GSM, but also the cordless telephony standard DECT and the Japanese PDC belong to the 2G systems <br>(marked blue in the graphic in the information section). | ||
| + | *The last statement is wrong: For example, the German "D–net" (Telekom TD1, Vodafone D2) operates in the frequency range around 900 MHz. | ||
| − | |||
| − | |||
| − | |||
| + | '''(3)''' Correct are the <u>statements 1 to 3</u>: | ||
| + | *Shortly after the introduction of GSM in the early 1990s, it became clear that the GSM data rate $(9.6 \ \rm kbit/s)$ was not sufficient for more demanding applications. | ||
| + | *The GSM extensions around the turn of the millennium include HSCSD $($up to $57.6 \ \ \rm kbit/s)$, GPRS $($up to $171 \ \ \rm kbit/s)$ and EDGE $($maximum $384 \ \ \rm kbit/s)$. | ||
| + | *HSDPA and HSUPA, which describe further developments of UMTS with regard to higher data rates in the downlink and uplink, may not be added to GSM phase 2+. | ||
| + | * [[Examples_of_Communication_Systems/Weiterentwicklungen_des_GSM#Enhanced_Data_Rates_for_GSM_Evolution|EDGE]] may actually be a further development of GSM, but it is nevertheless also listed as a 3G mobile communications system. The data rate is up to $384 \ \rm kbit/s$. | ||
| + | *The first statement is also correct. With the "Phase 2+" the [[Examples_of_Communication_Systems/Sprachcodierung#Adaptive_Multi.E2.80.93Rate_Codec|Adaptive Multi–Rate Codec]] (AMR) was also introduced, resulting in better voice quality. | ||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | '''(4)''' | + | '''(4)''' Correct are the <u>statements 2 and 3</u>: |
| − | * | + | *OFDM based LTE ("Long Term Evolution") brings further improvements and is also called E–UTRA in the UMTS standard, but it is considered to be of fourth generation $\rm (4G)$. |
| − | * | + | *All systems of the third mobile radio generation $\rm (3G)$ are marked green in the graphic in the information section. |
{{ML-Fuß}} | {{ML-Fuß}} | ||
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| − | [[Category: | + | [[Category:Mobile Communications: Exercises|^3.1 History of Mobile Communications Systems |
^]] | ^]] | ||
Latest revision as of 13:42, 17 November 2022
Terms and abbreviations
of mobile radio
of mobile radio
First mobile communication systems came onto the market in the mid to late 1950s, in Germany for example the "A–Netz".
However, the devices of that time cannot be compared with today's mobile phones in any way, either in terms of performance, volume or even more so in terms of weight.
Since the early 1980s, the development of mobile communications technology has progressed rapidly. Approximately every ten years, there have been significant changes in technology, performance and the services offered.
The fourth generation $\rm LTE$ (Long Term Evolution) of mobile communications was specified in 2008 with UMTS Release 8 and has also been available in Germany since around 2013, although it is not yet available nationwide today (2017).
Notes:
- The task belongs to the chapter History and Development of Mobile Communication Systems.
- In the diagram some terms and abbreviations of mobile radio are shown. There is no direct reference to the task.
- The colors indicate that the systems belong to the first, second and third generation of mobile radio.
Questions
Solution
(1) Correct are the proposals 1 and 4:
- The first generation of mobile communications $\rm (1G)$ offers only analog voice transmission.
- In addition to the systems mentioned above, ACS, NMT, TACS, RTMS and RC2000 are also included in the first generation of mobile communications
(marked in red in the graphic in the data section). - They all came onto the market in the early to mid of the 1980s.
(2) Correct are the proposals 1 to 4:
- The best known $\rm 2G$ representative is GSM, but also the cordless telephony standard DECT and the Japanese PDC belong to the 2G systems
(marked blue in the graphic in the information section). - The last statement is wrong: For example, the German "D–net" (Telekom TD1, Vodafone D2) operates in the frequency range around 900 MHz.
(3) Correct are the statements 1 to 3:
- Shortly after the introduction of GSM in the early 1990s, it became clear that the GSM data rate $(9.6 \ \rm kbit/s)$ was not sufficient for more demanding applications.
- The GSM extensions around the turn of the millennium include HSCSD $($up to $57.6 \ \ \rm kbit/s)$, GPRS $($up to $171 \ \ \rm kbit/s)$ and EDGE $($maximum $384 \ \ \rm kbit/s)$.
- HSDPA and HSUPA, which describe further developments of UMTS with regard to higher data rates in the downlink and uplink, may not be added to GSM phase 2+.
- EDGE may actually be a further development of GSM, but it is nevertheless also listed as a 3G mobile communications system. The data rate is up to $384 \ \rm kbit/s$.
- The first statement is also correct. With the "Phase 2+" the Adaptive Multi–Rate Codec (AMR) was also introduced, resulting in better voice quality.
(4) Correct are the statements 2 and 3:
- OFDM based LTE ("Long Term Evolution") brings further improvements and is also called E–UTRA in the UMTS standard, but it is considered to be of fourth generation $\rm (4G)$.
- All systems of the third mobile radio generation $\rm (3G)$ are marked green in the graphic in the information section.
