Aufgaben:Exercise 4.5: LTE vs LTE-Advanced - Revision history

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

2021-03-23T12:37:32Z

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

← Older revision		Revision as of 14:37, 23 March 2021
Line 102:		Line 102:


	[[Category:~~Exercises for~~ Mobile Communications\|^4.5 Further Developments of LTE^]]		[[Category:Mobile Communications: Exercises\|^4.5 Further Developments of LTE^]]


Line 116:		Line 116:


	[[Category:~~Exercises for~~ Mobile Communications\|^4.5 Further Developments of LTE^]]		[[Category:Mobile Communications: Exercises\|^4.5 Further Developments of LTE^]]

Guenter at 16:37, 6 February 2021

2021-02-06T16:37:47Z

← Older revision		Revision as of 18:37, 6 February 2021
Line 67:		Line 67:
	{{ML-Kopf}}		{{ML-Kopf}}

	'''(1)'''  Correct are the <u>answers 3 and 4</u>. LTE-B and LTE2 are pure fantasy names.		'''(1)'''  Correct are the <u>answers 3 and 4</u>.  LTE-B and LTE2 are pure fantasy names.
	*''Ultra Mobile Broadband'' (UMB) is a competitor to LTE, but is considered to be third generation.		*"Ultra Mobile Broadband"  (UMB) is a competitor to LTE, but is considered to be third generation.
	*It was specified by [http://www.3gpp2.com/ 3GPP2] (''Third Generation Partnership Project 2''), while LTE goes back to [http://www.3gpp.org/ 3GPP] (''Third Generation Partnership Project'').		*It was specified by  [http://www.3gpp2.com/ 3GPP2] ("Third Generation Partnership Project 2"), while LTE goes back to [http://www.3gpp.org/ 3GPP] ("Third Generation Partnership Project").
	*The 3GPP2 was founded almost at the same time as the almost named 3GPP in December 1998, apparently due to unbridgeable ideological differences.		*The "3GPP2" was founded almost at the same time as the almost named "3GPP" in December 1998, apparently due to unbridgeable ideological differences.
	*The success of UMB, however, seems to be more than questionable - at least in Europe - because even its predecessor ~~'''~~cdma2000~~'''~~, for which the term ~~'''~~W-CDMA'' is also common, plays almost no role anymore.		*The success of UMB, however, seems to be more than questionable - at least in Europe - because even its predecessor "cdma2000", for which the term "W-CDMA" is also common, plays almost no role anymore.
	*''Worldwide Interoperability for Microwave Access'' (WiMAX) is a synonym for radio systems according to the IEEE standard 802.16. These are also intended to compete with LTE in a mobile variant.		*"Worldwide Interoperability for Microwave Access" (WiMAX) is a synonym for radio systems according to the IEEE standard 802.16. These are also intended to compete with LTE in a mobile variant.
	*According to developers, there are currently (2011) already almost 600 WiMAX-based radio networks in 150 countries.		*According to developers, there are currently (2011) already almost 600 WiMAX based radio networks in 150 countries.



	'''(2)'''  Correct are the <u>answers 1 and 4</u>:		'''(2)'''  Correct are the <u>answers 1 and 4</u>:
	*The ''relay nodes'' are quasi additional base stations at the edges of the cells and ultimately ensure improved service quality, as interruptions when switching between cells become less frequent.		*The "relay nodes" are quasi additional base stations at the edges of the cells and ultimately ensure improved service quality, as interruptions when switching between cells become less frequent.
	*At the same time they increase the range.		*At the same time they increase the range.

Line 85:		Line 85:
	'''(3)'''  Correct are the <u>answers 2, 3 and 5</u>:		'''(3)'''  Correct are the <u>answers 2, 3 and 5</u>:
	*The most limiting factor for the data rate that can actually be achieved is that the users of mobile radio systems generally have to share the available bandwidth.		*The most limiting factor for the data rate that can actually be achieved is that the users of mobile radio systems generally have to share the available bandwidth.
	*This is called ~~&bdquo;~~Shared Medium&~~rdquo~~;. Voice connections slow down the network. In small cells without voice users, however, one almost reaches the specified rate.		*This is called "Shared Medium".  Voice connections slow down the network.  In small cells without voice users, however, one almost reaches the specified rate.
	*But also shielding by walls or other obstacles lead to a lower data rate.		*But also shielding by walls or other obstacles lead to a lower data rate.
	*The hardware, on the other hand, is already sufficiently available today to actually achieve the theoretically possible transmission rates. Older devices will not be able to achieve the full speed, however.		*The hardware, on the other hand, is already sufficiently available today to actually achieve the theoretically possible transmission rates.  Older devices will not be able to achieve the full speed, however.



	'''(4)'''  ~~The~~ only ~~correct answers are~~ <u>~~Answers~~ 1</u>:		'''(4)'''  Correct is only <u>Answer 1</u>:
	*WiMAX is specified in two different standards, a mobile one, which offers a high range with still comparatively high data rates, and a stationary one, which for example has a range six times higher than WLAN in a typical urban scenario and thus wants to compete with this standard.		*WiMAX is specified in two different standards, a mobile one, which offers a high range with still comparatively high data rates, and a stationary one, which for example has a range six times higher than WLAN in a typical urban scenario and thus wants to compete with this standard.
	*The achievable data rates of WiMAX and LTE are similar.		*The achievable data rates of WiMAX and LTE are similar.
	*Answer 3 is explicitly wrong: The German government supports LTE, not WiMAX.		*Answer 3 is explicitly wrong:  The German government supports LTE, not WiMAX.

	~~$\text{################################################################}$~~

	~~'''(1)'''  Richtig sind die <u>Antworten 3 und 4</u>. LTE–B und LTE2 sind dagegen reine Phantasienamen.~~
	*''Ultra Mobile Broadband'' (UMB) stellt einen Konkurrenzentwurf zu LTE dar, wird aber der dritten Generation zugerechnet.
	*Es wurde vom [http://www.3gpp2.com/ 3GPP2] (''Third Generation Partnership Project 2'') spezifiziert, während LTE auf [http://www.3gpp.org/ 3GPP] (''Third Generation Partnership Project'') zurückgeht.
	*Das 3GPP2 wurde nahezu zeitgleich mit dem fast namensgleichen 3GPP im Dezember 1998 gegründet, offenbar aufgrund von unüberbrückbaren ideologischen Differenzen.
	*Der Erfolg von UMB erscheint aber – zumindest in Europa – mehr als fraglich, denn schon der Vorgänger '''cdma2000''', für den auch die Bezeichnung '''W–CDMA''' gebräuchlich ist, spielt so gut wie keine Rolle mehr.
	*''Worldwide Interoperability for Microwave Access'' (WiMAX) ist ein Synonym für Funksysteme nach dem IEEE-Standard 802.16. Diese sollen in einer mobilen Variante LTE ebenfalls Konkurrenz machen.
	*Laut Auskunft der Entwickler gibt es derzeit (2011) schon fast 600 auf WiMAX basierende Funknetze in 150 Ländern.



	~~'''(2)'''  Richtig sind die <u>Antworten 1 und 4</u>:~~
	*Die ''Relay Nodes'' sind quasi zusätzliche Basisstationen an den Zellenrändern und sorgen im Endeffekt für eine verbesserte Servicequalität, da damit Unterbrechungen beim Wechsel zwischen Zellen seltener werden.
	*Gleichzeitig erhöhen sie die Reichweite.



	~~'''(3)'''  Richtig sind die <u>Antworten 2, 3 und 5</u>:~~
	*Der am stärksten begrenzende Faktor für die tatsächlich erreichbare Datenrate ist, dass sich die Nutzer von Mobilfunksystemen die zur Verfügung stehende Bandbreite generell teilen müssen.
	*Man spricht von einem &bdquo;Shared Medium”. Sprachverbindungen bremsen das Netz aus. In kleinen Zellen ohne Sprachnutzer erreicht man allerdings fast die angegebene Rate.
	*Aber auch Abschirmungen durch Wände oder andere Hindernisse führen zu einer geringeren Datenrate.
	*Die Hardware steht hingegen schon heute ausreichend zur Verfügung, um die theoretisch möglichen Übertragungsraten auch wirklich zu erreichen. Ältere Geräte werden die volle Geschwindigkeit allerdings nicht leisten können.



	~~'''(4)'''  Richtig ist nur die <u>Antworten 1</u>:~~
	*WiMAX ist in zwei verschiedenen Standards spezifiziert, einem mobilen, der eine hohe Reichweite bei weiterhin vergleichsweise hohen Datenraten bietet, sowie einem stationären, der beispielweise in einem typisch urbanen Szenario eine sechsmal höhere Reichweite als WLAN besitzt und diesem Standard somit Konkurrenz machen will.
	*Die erreichbaren Datenraten von WiMAX und LTE sind ähnlich.
	*Die Antwort 3 ist ausdrücklich falsch: Die Bundesregierung unterstützt LTE, nicht WiMAX.
	{{ML-Fuß}}		{{ML-Fuß}}

Guenter at 16:28, 6 February 2021

2021-02-06T16:28:11Z

← Older revision		Revision as of 18:28, 6 February 2021
Line 38:		Line 38:
	- W-CDMA.		- W-CDMA.

	{What is to be achieved with the ''Relay Nodes'' in LTE-Advanced?		{What is to be achieved with the  "Relay Nodes"  in LTE-Advanced?
	\|type="[]"}		\|type="[]"}
	+ A better QoS ("Quality of Service").		+ A better QoS ("Quality of Service").
Line 64:		Line 64:


	=== ~~sample solution~~===		===Solution===
	{{ML-Kopf}}		{{ML-Kopf}}

Guenter at 16:18, 6 February 2021

2021-02-06T16:18:38Z

← Older revision		Revision as of 18:18, 6 February 2021
Line 21:		Line 21:
	*The task belongs to the chapter  [[Mobile_Communications/LTE-Advanced_-_a_Further_Development_of_LTE\|LTE-Advanced - a further development of LTE]].		*The task belongs to the chapter  [[Mobile_Communications/LTE-Advanced_-_a_Further_Development_of_LTE\|LTE-Advanced - a further development of LTE]].
	*The above graphic shows some of the innovations in the transition from LTE to LTE-A.		*The above graphic shows some of the innovations in the transition from LTE to LTE-A.
	*In addition to LTE and LTE-Advanced, other newer standards such as  [https://en.wikipedia.org/wiki/WiMAX WiMAX]  and  [~~http~~://en.~~itwissen~~.~~info~~/~~UMB~~-~~ultra~~-~~mobile~~-broadband.~~html~~ UMB]  (''Ultra Mobile Broadband'') are also referred to.		*In addition to LTE and LTE-Advanced, other newer standards such as  [https://en.wikipedia.org/wiki/WiMAX $\rm WiMAX$]  and  [https://www.electronics-notes.com/articles/connectivity/cdmaone-cdma2000/umb-ultramobile-broadband.php $\rm UMB$]  (''Ultra Mobile Broadband'') are also referred to.

Guenter at 16:15, 6 February 2021

2021-02-06T16:15:28Z

← Older revision		Revision as of 18:15, 6 February 2021
Line 21:		Line 21:
	*The task belongs to the chapter  [[Mobile_Communications/LTE-Advanced_-_a_Further_Development_of_LTE\|LTE-Advanced - a further development of LTE]].		*The task belongs to the chapter  [[Mobile_Communications/LTE-Advanced_-_a_Further_Development_of_LTE\|LTE-Advanced - a further development of LTE]].
	*The above graphic shows some of the innovations in the transition from LTE to LTE-A.		*The above graphic shows some of the innovations in the transition from LTE to LTE-A.
	*In addition to LTE and LTE-Advanced, other newer standards such as  [https://de.wikipedia.org/wiki/WiMAX WiMAX]  and  [http://~~www~~.itwissen.info/UMB-ultra-mobile-broadband.html UMB]  (''Ultra Mobile Broadband'') are also referred to.		*In addition to LTE and LTE-Advanced, other newer standards such as  [https://en.wikipedia.org/wiki/WiMAX WiMAX]  and  [http://en.itwissen.info/UMB-ultra-mobile-broadband.html UMB]  (''Ultra Mobile Broadband'') are also referred to.

Guenter at 16:14, 6 February 2021

2021-02-06T16:14:22Z

← Older revision		Revision as of 18:14, 6 February 2021
Line 3:		Line 3:
	}}		}}
	[[File:EN_A_4_5_vers2.png\|right\|frame\|New features for LTE-Advanced]]		[[File:EN_A_4_5_vers2.png\|right\|frame\|New features for LTE-Advanced]]
	In summer 2011, LTE is ~~now~~ on the verge of commercial use, and construction and expansion work is currently underway in more and more major cities. Even if - as with previous standards - it will still take some time before all interested parties can enjoy the benefits of this fourth-generation mobile communications system:   $ {\rm LTE}$  is on the advance.		Since summer 2011, LTE is on the verge of commercial use, and construction and expansion work is currently underway in more and more major cities.  Even if - as with previous standards - it will still take some time before all interested parties can enjoy the benefits of this fourth-generation mobile communications system:   $ {\rm LTE}$  is on the advance.


	At the same time, the successor  ${\rm LTE-Advanced}$  (LTE-A for short) has already reached the final stage of specification.		At the same time, the successor  ${\rm LTE-Advanced}$  (LTE-A for short) has already reached the final stage of specification.
	*In comparison to LTE, the speeds here are more than tripled, roughly speaking.		*In comparison to LTE, the speeds here are more than tripled, roughly speaking.
	*This shows that even in 2011 - almost 20 years after the initial euphoria - ''Moore's Law''  can still be applied to mobile communications.		*This shows that even in 2011 - almost twenty years after the initial euphoria - "Moore's Law"  can still be applied to mobile communications.
	*Continuing technical development can be expected.		*Continuing technical development can be expected.

Line 19:		Line 19:
	''Notes:''		''Notes:''

	*The task belongs to the chapter  [[Mobile_Communications/LTE-Advanced_-~~_a_development_of_LTE~~\|LTE-Advanced - a further development of LTE]].		*The task belongs to the chapter  [[Mobile_Communications/LTE-Advanced_-_a_Further_Development_of_LTE\|LTE-Advanced - a further development of LTE]].
	*The above graphic shows some of the innovations in the transition from LTE to LTE-A.		*The above graphic shows some of the innovations in the transition from LTE to LTE-A.
	*In addition to LTE and LTE-Advanced, other newer standards such as  [https://de.wikipedia.org/wiki/WiMAX WiMAX]  and  [http://www.itwissen.info/UMB-ultra-mobile-broadband.html UMB]  (''Ultra Mobile Broadband'') are also referred to.		*In addition to LTE and LTE-Advanced, other newer standards such as  [https://de.wikipedia.org/wiki/WiMAX WiMAX]  and  [http://www.itwissen.info/UMB-ultra-mobile-broadband.html UMB]  (''Ultra Mobile Broadband'') are also referred to.

Javier: Text replacement - "Mobile Kommunikation/LTE–Advanced – eine Weiterentwicklung von LTE" to "Mobile_Communications/LTE-Advanced_-_a_Further_Development_of_LTE"

2020-12-15T14:07:48Z

Text replacement - "Mobile Kommunikation/LTE–Advanced – eine Weiterentwicklung von LTE" to "Mobile_Communications/LTE-Advanced_-_a_Further_Development_of_LTE"

← Older revision		Revision as of 16:07, 15 December 2020
Line 1:		Line 1:

	{{quiz-Header\|Buchseite=~~Mobile Kommunikation~~/~~LTE–Advanced – eine Weiterentwicklung von~~ LTE		{{quiz-Header\|Buchseite=Mobile_Communications/LTE-Advanced_-_a_Further_Development_of_LTE
	}}		}}
	[[File:EN_A_4_5_vers2.png\|right\|frame\|New features for LTE-Advanced]]		[[File:EN_A_4_5_vers2.png\|right\|frame\|New features for LTE-Advanced]]

Oezdemir at 18:04, 22 July 2020

2020-07-22T18:04:49Z

← Older revision		Revision as of 20:04, 22 July 2020
Line 23:		Line 23:
	*In addition to LTE and LTE-Advanced, other newer standards such as  [https://de.wikipedia.org/wiki/WiMAX WiMAX]  and  [http://www.itwissen.info/UMB-ultra-mobile-broadband.html UMB]  (''Ultra Mobile Broadband'') are also referred to.		*In addition to LTE and LTE-Advanced, other newer standards such as  [https://de.wikipedia.org/wiki/WiMAX WiMAX]  and  [http://www.itwissen.info/UMB-ultra-mobile-broadband.html UMB]  (''Ultra Mobile Broadband'') are also referred to.

	~~[[File:P_ID2296__A_4_5.png\|right\|frame\|Neuerungen bei LTE–Advanced]]~~

Oezdemir at 18:04, 22 July 2020

2020-07-22T18:04:34Z

← Older revision		Revision as of 20:04, 22 July 2020
Line 23:		Line 23:
	*In addition to LTE and LTE-Advanced, other newer standards such as  [https://de.wikipedia.org/wiki/WiMAX WiMAX]  and  [http://www.itwissen.info/UMB-ultra-mobile-broadband.html UMB]  (''Ultra Mobile Broadband'') are also referred to.		*In addition to LTE and LTE-Advanced, other newer standards such as  [https://de.wikipedia.org/wiki/WiMAX WiMAX]  and  [http://www.itwissen.info/UMB-ultra-mobile-broadband.html UMB]  (''Ultra Mobile Broadband'') are also referred to.

	~~$\text{################################################################}$~~
	[[File:P_ID2296__A_4_5.png\|right\|frame\|Neuerungen bei LTE–Advanced]]		[[File:P_ID2296__A_4_5.png\|right\|frame\|Neuerungen bei LTE–Advanced]]

Line 64:		Line 63:
	</quiz>		</quiz>

	~~$\text{################################################################}$~~

Oezdemir: /* Fragebogen */

2020-07-22T18:04:16Z

Fragebogen

← Older revision		Revision as of 20:04, 22 July 2020
Line 64:		Line 64:
	</quiz>		</quiz>

	~~$\text{################################################################}$~~


	~~===Fragebogen===~~

	~~<quiz display=simple>~~

	~~{Welche Standards stehen in direkter Konkurrenz zu LTE bzw. LTE–A?~~
	~~\|type="[]"}~~
	~~- LTE–B,~~
	~~- LTE2,~~
	~~+ WiMAX,~~
	~~+ UMB,~~
	~~- W–CDMA.~~

	~~{Was soll mit den ''Relay Nodes'' in LTE–Advanced erreicht werden?~~
	~~\|type="[]"}~~
	~~+ Ein besseres QoS (''Quality of Service'').~~
	~~- Höhere Übertragungsraten in der Nähe der Basisstationen.~~
	~~- Eine größere Robustheit durch mehrfache gleichzeitige Übertragung.~~
	~~+ Eine Erhöhung der Reichweite der Zellen.~~

	~~{Warum werden die theoretisch möglichen Datenraten praktisch nicht erreicht?~~
	~~\|type="[]"}~~
	~~- Die Spezifizierung war zu optimistisch.~~
	~~+ Viele gleichzeitige Nutzer führen zu einer Degradation.~~
	~~+ Einfluss von Abschirmungen durch Gebäude, etc.~~
	~~- Die verfügbare Hardware bremst das theoretisch schnelle Netz aus.~~
	~~+ Es gibt Probleme mit der Umsetzung von Sprachverbindungen.~~

	~~{Worin liegt das Potential von WiMAX und dessen Nachfolger?~~
	~~\|type="[]"}~~
	~~+ WiMAX bietet große Reichweiten und hohe Datenraten gleichermaßen.~~
	~~- WiMAX ist wesentlich schneller als LTE bzw. LTE–Advanced.~~
	~~- WiMAX wird durch die Bundesregierung besonders unterstützt.~~


	~~</quiz>~~
	$\text{################################################################}$		$\text{################################################################}$