Aufgaben:Exercise 3.1: Development of the Mobile Network - Revision history

Hwang at 12:42, 17 November 2022

2022-11-17T12:42:03Z

Javier: Text replacement - "Category:Exercises for Mobile Communications" to "Category:Mobile Communications: Exercises"

2021-03-23T12:37:21Z

Text replacement - "Category:Exercises for Mobile Communications" to "Category:Mobile Communications: Exercises"

Guenter at 17:25, 17 February 2021

2021-02-17T17:25:31Z

Guenter at 17:24, 17 February 2021

2021-02-17T17:24:31Z

Guenter at 17:19, 17 February 2021

2021-02-17T17:19:12Z

Guenter at 17:06, 18 January 2021

2021-01-18T17:06:42Z

Guenter at 16:53, 18 January 2021

2021-01-18T16:53:28Z

Javier: Text replacement - "===Solutions===" to "===Solution==="

2020-12-15T14:11:21Z

Text replacement - "===Solutions===" to "===Solution==="

Javier: Text replacement - "Mobile Kommunikation/Historie und Entwicklung der Mobilfunksysteme" to "Mobile_Communications/History_and_Development_of_Mobile_Communication_Systems"

2020-12-15T14:01:41Z

Text replacement - "Mobile Kommunikation/Historie und Entwicklung der Mobilfunksysteme" to "Mobile_Communications/History_and_Development_of_Mobile_Communication_Systems"

Oezdemir: /* Solutions */

2020-07-30T20:53:13Z

Solutions

@@ Line 66: / Line 66: @@
 '''(1)'''&nbsp; Correct are the <u>proposals 1 and 4</u>:
 *The first generation of mobile communications&nbsp; $\rm (1G)$&nbsp; offers only analog voice transmission.
-*In addition to the systems mentioned above,&nbsp; ACS,&nbsp; NMT,&nbsp; TACS,&nbsp; RTMS&nbsp; and&nbsp; RC2000&nbsp; are also included in the first generation of mobile communications <br>(marked in red in the graphic on the data page).
+*In addition to the systems mentioned above,&nbsp; ACS,&nbsp; NMT,&nbsp; TACS,&nbsp; RTMS&nbsp; and&nbsp; RC2000&nbsp; 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.
@@ Line 72: / Line 72: @@
 '''(2)'''&nbsp; Correct are the <u>proposals 1 to 4</u>:
-*The best known&nbsp; $\rm 2G$&nbsp;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 on the information page).
+*The best known&nbsp; $\rm 2G$&nbsp;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: &nbsp; For example, the German "D&ndash;net" (Telekom TD1, Vodafone D2) operates in the frequency range around 900 MHz.
@@ Line 89: / Line 89: @@
 '''(4)'''&nbsp; Correct are the <u>statements 2 and 3</u>:
 *OFDM based LTE ("Long Term Evolution") brings further improvements and is also called E&ndash;UTRA in the UMTS standard, but it is considered to be of fourth generation&nbsp; $\rm (4G)$.
-*All systems of the third mobile radio generation&nbsp; $\rm (3G)$&nbsp; are marked green in the graphic on the information page.
+*All systems of the third mobile radio generation&nbsp; $\rm (3G)$&nbsp; are marked green in the graphic in the information section.
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← Older revision		Revision as of 12:37, 23 March 2021
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−	[[Category:~~Exercises for~~ Mobile Communications\|^3.1 History of Mobile Communications Systems	+	[[Category:Mobile Communications: Exercises\|^3.1 History of Mobile Communications Systems
	^]]		^]]

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 '''(4)'''&nbsp; Correct are the <u>statements 2 and 3</u>:
 *OFDM based LTE ("Long Term Evolution") brings further improvements and is also called E&ndash;UTRA in the UMTS standard, but it is considered to be of fourth generation&nbsp; $\rm (4G)$.
-*All systems of the third mobile radio generation are marked green in the graphic on the information page.
+*All systems of the third mobile radio generation&nbsp; $\rm (3G)$&nbsp; are marked green in the graphic on the information page.
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@@ Line 65: / Line 65: @@
 '''(1)'''&nbsp; Correct are the <u>proposals 1 and 4</u>:
-*The first generation of mobile communications&nbsp; $(1G)$&nbsp; offers only analog voice transmission.
+*The first generation of mobile communications&nbsp; $\rm (1G)$&nbsp; offers only analog voice transmission.
-*In addition to the systems mentioned above, ACS, NMT, TACS, RTMS and RC 2000 are also included in the first generation of mobile communications (marked in red in the graphic on the data page).
+*In addition to the systems mentioned above,&nbsp; ACS,&nbsp; NMT,&nbsp; TACS,&nbsp; RTMS&nbsp; and&nbsp; RC2000&nbsp; are also included in the first generation of mobile communications <br>(marked in red in the graphic on the data page).
 *They all came onto the market in the early to mid of the 1980s.
@@ Line 72: / Line 72: @@
 '''(2)'''&nbsp; Correct are the <u>proposals 1 to 4</u>:
-*The best known 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 on the information page).
+*The best known&nbsp; $\rm 2G$&nbsp;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 on the information page).
 *The last statement is wrong: &nbsp; For example, the German "D&ndash;net" (Telekom TD1, Vodafone D2) operates in the frequency range around 900 MHz.
@@ Line 82: / Line 82: @@
 *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.&nbsp; 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]]&nbsp; (AMR) was also  introduced, resulting in better voice quality.
+*The first statement is also correct. With the "Phase 2+" the&nbsp; [[Examples_of_Communication_Systems/Sprachcodierung#Adaptive_Multi.E2.80.93Rate_Codec|Adaptive Multi–Rate Codec]]&nbsp; (AMR) was also  introduced, resulting in better voice quality.
@@ Line 88: / Line 88: @@
 '''(4)'''&nbsp; Correct are the <u>statements 2 and 3</u>:
-*OFDM based LTE (<i>Long Term Evolution</i>) brings further improvements and is also called E&ndash;UTRA in the UMTS standard, but it is considered to be of fourth generation.
+*OFDM based LTE ("Long Term Evolution") brings further improvements and is also called E&ndash;UTRA in the UMTS standard, but it is considered to be of fourth generation&nbsp; $\rm (4G)$.
 *All systems of the third mobile radio generation are marked green in the graphic on the information page.

@@ Line 3: / Line 3: @@
 }}
-[[File:P_ID2214__Mob_A_3_1.png|right|frame|Terms & Abbreviations <br>of mobile radio]]
+[[File:P_ID2214__Mob_A_3_1.png|right|frame|Terms and abbreviations <br>of mobile radio]]
-The first mobile communication systems came onto the market in the mid to late 1950s, in Germany for example the so-called "A-Netz".
+First mobile communication systems came onto the market in the mid to late 1950s, in Germany for example the  "A&ndash;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.
@@ Line 33: / Line 33: @@
 - These enable data transmission.
 - These are fully digitized systems.
-+ $\rm 1G$&nbsp; includes AMPS and the German "C-Net".
++ $\rm 1G$&nbsp; includes AMPS and the German "C&ndash;Netz".
 {What is the case for second generation mobile communications systems&nbsp; $\rm (2G)$?

@@ Line 64: / Line 64: @@
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-'''(1)'''&nbsp; Correct are the <u>solution suggestions 1 and 4</u>:
+'''(1)'''&nbsp; Correct are the <u>proposals 1 and 4</u>:
-*Die erste Generation der Mobilkommunikation (1G) bietet nur analoge Sprachübertragung.
+*The first generation of mobile communications&nbsp; $(1G)$&nbsp; offers only analog voice transmission.
-*Zusätzlich zu den oben genannten Systemen sind auch ACS, NMT, TACS, RTMS und RC 2000 in der ersten Mobilfunkgeneration <br>(in der Grafik auf der Datenseite rot markiert) enthalten.
+*In addition to the systems mentioned above, ACS, NMT, TACS, RTMS and RC 2000 are also included in the first generation of mobile communications (marked in red in the graphic on the data page).
-*Sie alle kamen Anfang bis Mitte der 1980er Jahre auf den Markt.
+*They all came onto the market in the early to mid of the 1980s.
-'''(2)'''&nbsp; Correct are the <u>solution proposals 1 to 4</u>:
+'''(2)'''&nbsp; Correct are the <u>proposals 1 to 4</u>:
-*The best known 2G&ndash;representative is GSM, but also the cordless telephony&ndash;standard DECT and the Japanese PDC belong to the 2G&ndash;systems <br>(marked blue in the graphic on the information page).
+*The best known 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 on the information page).
-*The last statement is wrong: &nbsp; For example, the German D&ndash;network (Telekom TD1, Vodafone D2) operates in the frequency range around 900 MHz.
+*The last statement is wrong: &nbsp; For example, the German "D&ndash;net" (Telekom TD1, Vodafone D2) operates in the frequency range around 900 MHz.
 '''(3)'''&nbsp; 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&ndash;data rate &nbsp;$(9.6 \ \rm kbit/s)$&nbsp; was not sufficient for more demanding applications.
+*Shortly after the introduction of GSM in the early 1990s, it became clear that the GSM data rate &nbsp;$(9.6 \ \rm kbit/s)$&nbsp; was not sufficient for more demanding applications.
-*The GSM&ndash;extensions around the turn of the millennium include HSCSD&nbsp; $($up to $57.6 \ \ \rm kbit/s)$,&nbsp; GPRS $($up to $171 \ \ \rm kbit/s)$&nbsp; and EDGE&nbsp; $($maximum $384 \ \ \rm kbit/s)$.
+*The GSM extensions around the turn of the millennium include HSCSD&nbsp; $($up to $57.6 \ \ \rm kbit/s)$,&nbsp; GPRS $($up to $171 \ \ \rm kbit/s)$&nbsp; and EDGE&nbsp; $($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&ndash;Phase 2+.
+*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 $384 \ \rm kbit/s$.
+* [[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.&nbsp; 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]] was also developed. (AMR) was introduced, resulting in better voice quality.
+*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]]&nbsp; (AMR) was also  introduced, resulting in better voice quality.
@@ Line 88: / Line 88: @@
 '''(4)'''&nbsp; Correct are the <u>statements 2 and 3</u>:
-*OFDM-based LTE (<i>Long Term Evolution</i>) brings further improvements and is also called E&ndash;UTRA in the UMTS&ndash;standard, but it is considered to be fourth generation.
+*OFDM based LTE (<i>Long Term Evolution</i>) brings further improvements and is also called E&ndash;UTRA in the UMTS standard, but it is considered to be of fourth generation.
 *All systems of the third mobile radio generation are marked green in the graphic on the information page.

@@ Line 3: / Line 3: @@
 }}
-[[File:P_ID2214__Mob_A_3_1.png|right|frame|Mobile radio: Terms & Abbreviations]]
+[[File:P_ID2214__Mob_A_3_1.png|right|frame|Terms & Abbreviations <br>of mobile radio]]
-The first mobile communication systems came onto the market in the mid to late 1950s, in Germany for example the so-called A-network.
+The first mobile communication systems came onto the market in the mid to late 1950s, in Germany for example the so-called "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.
+Since the early 1980s, the development of mobile communications technology has progressed rapidly.&nbsp; Approximately every ten years, there have been significant changes in technology, performance and the services offered.
-The fourth generation&nbsp; $\Rightarrow$ &nbsp;  $\Rightarrow$ [[Mobile_Communications/Allgemeines_zum_Mobilfunkstandard_LTE|Long Term Evolution]] (LTE)  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).
+The fourth generation&nbsp;  [[Mobile_Communications/General_Information_on_the_LTE_Mobile_Communications_Standard |$\rm LTE$ ]]&nbsp; (Long Term Evolution)&nbsp; 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).
@@ Line 18: / Line 18: @@
 ''Notes:''
-*The task belongs to the chapter&nbsp; [[Mobile_Communications/Historie_und_Entwicklung_der_Mobilfunksysteme|Historie und Entwicklung der Mobilfunksysteme]].
+*The task belongs to the chapter&nbsp; [[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.&nbsp; 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.
@@ Line 28: / Line 28: @@
 <quiz display=simple>
-{Which statements apply to first generation mobile radio systems?
+{Which statements apply to first generation&nbsp; $\rm (1G)$&nbsp; mobile radio systems?
 |type="[]"}
 + These enable voice transmission.
 - These enable data transmission.
-- These are completely digitalised systems.
+- These are fully digitized systems.
-+ "1G" includes AMPS and the German C-Net.
++ $\rm 1G$&nbsp; includes AMPS and the German "C-Net".
-{What is the case for second generation mobile communications systems?
+{What is the case for second generation mobile communications systems&nbsp; $\rm (2G)$?
 |type="[]"}
-+ They enable voice transmission.
++ These enable voice transmission.
-+ They enable data transmission.
++ These enable data transmission.
-+ They are fully digitized systems.
++ These are fully digitized systems.
 + The second generation includes GSM, PDC and DECT.
-- All 2G systems operate on frequencies around 2 GHz.
+- All&nbsp; $\rm 2G$&nbsp; 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&nbsp; $\rm (2+)$"?
 |type="[]"}
 + They offer better voice quality than 2G systems.
-+ They offer a higher data rate than the 2G systems.
++ They offer a higher data rate than 2G systems.
 + The extensions HSCSD, GPRS and EDGE are included.
 - They also include HSDPA and HSUPA.
-{Which statements apply to third-generation mobile radio systems?
+{Which statements apply to third generation mobile radio systems&nbsp; $\rm (3G)$?
 |type="[]"}
 - The main advantage is the better voice quality.
 + The data rate is sufficient for "mobile internet".
 + The best known representative of 3G systems is UMTS.
-- The 3G&ndash;standard "LTE" brings further improvements.
+- The 3G standard "LTE" brings further improvements.
 </quiz>

← Older revision		Revision as of 14:11, 15 December 2020
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−	===~~Solutions~~===	+	===Solution===
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← Older revision		Revision as of 14:01, 15 December 2020
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−	{{quiz-Header\|Buchseite=~~Mobile Kommunikation~~/~~Historie und Entwicklung der Mobilfunksysteme~~	+	{{quiz-Header\|Buchseite=Mobile_Communications/History_and_Development_of_Mobile_Communication_Systems
	}}		}}