Aufgaben:Exercise 4.1: General Questions about LTE - Revision history

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

2021-03-23T12:37:10Z

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

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	[[Category:~~Exercises for~~ Mobile Communications\|^4.1 On the LTE Standard^]]		[[Category:Mobile Communications: Exercises\|^4.1 On the LTE Standard^]]

Guenter at 12:14, 1 March 2021

2021-03-01T12:14:47Z

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	LTE has been offered commercially since 2011, especially for sparsely populated rural areas without sufficient DSL broadband connections.  This 4G mobile communications standard is gradually becoming more widespread.		LTE has been offered commercially since 2011, especially for sparsely populated rural areas without sufficient DSL broadband connections.  This 4G mobile communications standard is gradually becoming more widespread.

	Currently (2017)  $\rm 5G$  is the all-dominant buzzword.  However, the author does not allow himself any more precise statements about the time of introduction than "very soon" or "as soon as possible".  More detailed information can be found  [https://de.wikipedia.org/wiki/5G here].		Currently (2017)  $\rm 5G$  is the all-dominant buzzword.  However, the author does not allow himself any more precise statements about the time of introduction than "very soon" or "as soon as possible".  More detailed information can be found  [https://en.wikipedia.org/wiki/5G here].

	Meanwhile (2021), we can say:  It was 2019, almost simultaneously in Korea and the US.		Meanwhile (2021), we can say:  It was 2019, almost simultaneously in Korea and the US.

Guenter at 15:54, 28 January 2021

2021-01-28T15:54:57Z

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	'''(2)'''  Correct are the <u>answers 2 and 4</u>:		'''(2)'''  Correct are the <u>answers 2 and 4</u>:
	* The decisive reason for the ~~duplex–gap~~ is to create a safety buffer between uplink and downlink.		* The decisive reason for the "Duplex Gap" is to create a safety buffer between uplink and downlink.
	*But ~~also~~ answer 4 is correct:   ~~radio~~ microphones have been and are still operated with frequencies in the range around 800 MHz, i.e. at frequencies that are now needed for LTE.		*But answer 4 is also correct:   Radio microphones have been and are still operated with frequencies in the range around 800 MHz, i.e. at frequencies that are now needed for LTE.
	*When LTE is finally extended to cover entire areas, there will be interference with less powerful radio microphones.		*When LTE is finally extended to cover entire areas, there will be interference with less powerful radio microphones.
	*In addition, the use of event technology on the LTE frequencies will be prohibited for the years after 2015. Among other things, this is also why there is this duplex gap, but that is not the real reason, it is a useful side effect.		*In addition, the use of event technology on the LTE frequencies will be prohibited for the years after 2015.  Among other things, this is also why there is this duplex gap, but that is not the real reason, it is a useful side effect.



	'''(3)'''  Correct are the <u>~~three first~~ answers</u>:		'''(3)'''  Correct are the <u>answers 1 to 3</u>:
	*OFDMA is used in the downlink of LTE, SC–FDMA in the uplink.		*OFDMA is used in the downlink of LTE, SC–FDMA in the uplink.
	*Multiple-input multiple-output (MIMO) systems are used more frequently in mobile communications, and not only in LTE.		*Multiple-input multiple-output (MIMO) systems are used more frequently in mobile communications, and not only in LTE.

Guenter at 15:48, 28 January 2021

2021-01-28T15:48:14Z

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	}}		}}

	[[File:P_ID2264__MOB_A4_1_v1.png\|right\|frame\|Some terms ~~about~~&~~bdquo~~;LTE~~”~~]]		[[File:P_ID2264__MOB_A4_1_v1.png\|right\|frame\|Some terms concerning  $\rm LTE$]]
	Since 2011, mobile communications systems have already reached the fourth generation, without serious delays, as was the case with the second generation of mobile communications (GSM) and even more so with the third generation (UMTS). Currently (2017) "5G" is the all-dominant buzzword. However, the author does not allow himself any more precise statements about the time of introduction than "very soon" or "as soon as possible". More detailed information can be found  ~~[https://de.wikipedia.org/wiki/5G here].~~		Since 2011, mobile communications systems have already reached the fourth generation, without serious delays, as was the case with the second generation of mobile communications  $\rm (GSM)$  and even more so with the third generation  $\rm (UMTS)$.

	The development of new "releases" is constantly being driven forward by 3GPP. This international consortium, which includes all major mobile operators and manufacturers worldwide, will continue to play a prominent role in mobile communications in the future.		The development of new "releases" is constantly being driven forward by  [[Mobile_Communications/General_Information_on_the_LTE_Mobile_Communications_Standard#3GPP_-_Third_Generation_Partnership_Project \|$\text{3GPP}$]].  This international consortium, which includes all major mobile operators and manufacturers worldwide, will continue to play a prominent role in mobile communications in the future.

	LTE has been offered commercially since 2011, especially for sparsely populated rural areas without sufficient DSL broadband connections. This 4G mobile communications standard is gradually becoming more widespread.		LTE has been offered commercially since 2011, especially for sparsely populated rural areas without sufficient DSL broadband connections.  This 4G mobile communications standard is gradually becoming more widespread.

			Currently (2017)  $\rm 5G$  is the all-dominant buzzword.  However, the author does not allow himself any more precise statements about the time of introduction than "very soon" or "as soon as possible".  More detailed information can be found  [https://de.wikipedia.org/wiki/5G here].

			Meanwhile (2021), we can say:  It was 2019, almost simultaneously in Korea and the US.


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	''Notes:''		''Notes:''

	*This task belongs to the chapter  [[Mobile_Communications/~~Allgemeines_zum_Mobilfunkstandard_LTE~~\|~~Allgemeines zum Mobilfunkstandard~~ LTE]].		*This task belongs to the chapter  [[Mobile_Communications/General_Information_on_the_LTE_Mobile_Communications_Standard\|General Information on the LTE Mobile Communications Standard]].
	*The chart shows some LTE-relevant terms. However, there is no direct reference to the task.		*The chart shows some LTE relevant terms.  However, there is no direct reference to the task.


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	<quiz display=simple>		<quiz display=simple>

	{Which important innovations were described by 3GPP in ~~release~~ 8?		{Which important innovations were described by 3GPP in the Release 8?
	\|type="[]"}		\|type="[]"}
	+ A purely packet-oriented transmission,		+ A purely packet-oriented transmission,
	+ a high spectral efficiency,		+ a high spectral efficiency,
	+ ~~Frequency~~ or bandwidth flexibility,		+ frequency or bandwidth flexibility,
	- low energy consumption at the base stations.		- low energy consumption at the base stations.

	{What is the duplex gap of the LTE frequency band around  $800 \ \rm MHz$ for?		{What is the  "duplex gap"  of the LTE frequency band around  $800 \ \rm MHz$  for?
	\|type="[]"}		\|type="[]"}
	- For the realization of the  ''Cyclic Prefix'',		- For the realization of the  "Cyclic Prefix",
	+ to avoid interference between uplink and downlink,		+ to avoid interference between uplink and downlink,
	- to avoid overlapping between individual providers.		- to avoid overlapping between individual providers.
	+ The duplex gap is also used to operate wireless microphones.		+ The duplex gap is also used to operate wireless microphones.

	{What methods and techniques does LTE <u>mainly</u> use ?		{What methods and techniques does LTE <u>mainly</u> use?
	\|type="[]"}		\|type="[]"}
	+ OFDMA,		+ OFDMA,
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	- CDMA.		- CDMA.

	{How do the frequency bands ~~differ~~ by  $800 \ \rm MHz$  or by  $2.6 \ \rm GHz$?		{How do the frequency bands by  $800 \ \rm MHz$  and by  $2.6 \ \rm GHz$  differ?
	\|type="[]"}		\|type="[]"}
	+ By different prices at the auction.		+ By different prices at the auction.

Javier: Text replacement - "===Sample solution===" to "===Solution==="

2020-12-16T13:16:19Z

Text replacement - "===Sample solution===" to "===Solution==="

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	</quiz>		</quiz>

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

Javier at 14:05, 15 December 2020

2020-12-15T14:05:26Z

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	{{quiz-Header\|Mobile_Communications/General_Information_on_the_LTE_Mobile_Communications_Standard		{{quiz-Header\|Buchseite=Mobile_Communications/General_Information_on_the_LTE_Mobile_Communications_Standard
	}}		}}

Javier: Text replacement - "Buchseite=Mobile Kommunikation/Allgemeines zum Mobilfunkstandard LTE" to "Mobile_Communications/General_Information_on_the_LTE_Mobile_Communications_Standard"

2020-12-15T14:04:50Z

Text replacement - "Buchseite=Mobile Kommunikation/Allgemeines zum Mobilfunkstandard LTE" to "Mobile_Communications/General_Information_on_the_LTE_Mobile_Communications_Standard"

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	{{quiz-Header\|~~Buchseite=Mobile Kommunikation~~/~~Allgemeines zum Mobilfunkstandard LTE~~		{{quiz-Header\|Mobile_Communications/General_Information_on_the_LTE_Mobile_Communications_Standard
	}}		}}

Oezdemir at 15:34, 1 November 2020

2020-11-01T15:34:37Z

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	[[Category:Exercises for Mobile Communications\|^4.1 On the LTE ~~standard~~^]]		[[Category:Exercises for Mobile Communications\|^4.1 On the LTE Standard^]]

Oezdemir: /* Sample solution */

2020-07-10T13:18:00Z

Sample solution

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	{{ML-Kopf}}		{{ML-Kopf}}

	'''(1)'''  ~~Richtig sind die~~ <u>~~Antworten~~ 1 ~~bis~~ 3</u>, ~~die auch für die wichtigsten Verbesserungen durch~~ LTE ~~stehen~~:		'''(1)'''  Correct are the <u>answers 1 to 3</u>, which also stand for the most important improvements through LTE:
	*~~Ein niedriger Energieverbrauch an den Basisstationen ist ausdrücklich falsch~~, ~~denn es geht um einen möglichst niedrigen Energieverbrauch bei den Endgeräten~~, ~~wofür sogar ein erhöhter Energieverbrauch an den Basisstationen in Kauf genommen wird~~.		*Low power consumption at base stations is explicitly wrong, because the aim is to keep power consumption at the terminals as low as possible, for which even increased power consumption at base stations is accepted.



	'''(2)'''  ~~Richtig sind die~~ <u>~~Antworten~~ 2 ~~und~~ 4</u>:		'''(2)'''  Correct are the <u>answers 2 and 4</u>:
	* ~~Der entscheidende Grund für die Duplex~~–~~Lücke ist es, einen Sicherheitsbuffer zwischen Uplink und Downlink zu schaffen~~.		* The decisive reason for the duplex–gap is to create a safety buffer between uplink and downlink.
	*~~Aber auch Antwort~~ 4 ~~ist richtig~~:   ~~Funkmikrofone wurden und werden auch momentan noch mit Frequenzen im Bereich um~~ 800 MHz ~~betrieben~~, ~~also bei solchen Frequenzen, die jetzt für~~ LTE ~~gebraucht werden~~.		*But also answer 4 is correct:   radio microphones have been and are still operated with frequencies in the range around 800 MHz, i.e. at frequencies that are now needed for LTE.
	*~~Wenn~~ LTE ~~endgültig flächendeckend ausgebaut ist~~, ~~so kommt es zu Beeinträchtigungen von leistungsschwächeren Funkmikrofonen~~.		*When LTE is finally extended to cover entire areas, there will be interference with less powerful radio microphones.
	*~~Darüber hinaus ist für die Jahre nach~~ 2015 ~~der Einsatz von Veranstaltungstechnik auf den LTE–Frequenzen verboten~~. ~~Unter anderem deshalb gibt es diese Duplex–Lücke~~, ~~aber das ist nicht der eigentliche Grund~~, ~~sondern ein nützlicher Nebeneffekt~~.		*In addition, the use of event technology on the LTE frequencies will be prohibited for the years after 2015. Among other things, this is also why there is this duplex gap, but that is not the real reason, it is a useful side effect.



	'''(3)'''  ~~Richtig sind die~~ <u>~~drei ersten Antworten~~</u>:		'''(3)'''  Correct are the <u>three first answers</u>:
	*OFDMA ~~kommt im Downlink von~~ LTE ~~zum Einsatz~~, SC–FDMA ~~im Uplink~~.		*OFDMA is used in the downlink of LTE, SC–FDMA in the uplink.
	*~~Mehrantennensysteme~~ (~~englisch: ''Multiple Input Multiple Output'',~~ MIMO) ~~kommen im Mobilfunk häufiger zum Einsatz~~, ~~nicht nur bei~~ LTE.		*Multiple-input multiple-output (MIMO) systems are used more frequently in mobile communications, and not only in LTE.
	*~~Tatsächlich wird bei~~ LTE ~~aber auch CDMA eingesetzt~~, ~~allerdings nur für Kontrollkanäle~~.		*In fact, CDMA is also used for LTE, but only for control channels.


			'''(4)'''  Correct are the <u>answers 1, 2 and 4</u>:
	'''(4)'''  ~~Richtig sind die~~ <u>~~Antworten~~ 1, 2 ~~und~~ 4</u>:		*The higher-frequency 2600 MHz range is particularly interesting for large cities due to conditions imposed by the federal government and because of the lower range.
	*~~Der höherfrequente~~ 2600 ~~MHz–Bereich ist insbesondere aufgrund von Auflagen der Bundesregierung und wegen der geringeren Reichweite für Großstädte interessant~~.		*The 800 MHz range, which consists of paired frequencies only, will be used primarily for rural areas.
	*~~Der nur aus gepaarten Frequenzen bestehende~~ 800 ~~MHz–Bereich wird vorwiegend für ländliche Gebiete genutzt werden~~.

	{{ML-Fuß}}		{{ML-Fuß}}

Oezdemir at 11:21, 10 July 2020

2020-07-10T11:21:05Z

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	*This task belongs to the chapter  [[Mobile_Communications/Allgemeines_zum_Mobilfunkstandard_LTE\|Allgemeines zum Mobilfunkstandard LTE]].		*This task belongs to the chapter  [[Mobile_Communications/Allgemeines_zum_Mobilfunkstandard_LTE\|Allgemeines zum Mobilfunkstandard LTE]].
	*~~IThe~~ chart shows some LTE-relevant terms. However, there is no direct reference to the task.		*The chart shows some LTE-relevant terms. However, there is no direct reference to the task.