Aufgaben:Exercise 4.2: FDD, TDD and Half-Duplex - Revision history

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

2021-03-23T12:37:52Z

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

Guenter at 16:47, 29 January 2021

2021-01-29T16:47:31Z

Guenter at 16:37, 29 January 2021

2021-01-29T16:37:44Z

Guenter at 16:36, 29 January 2021

2021-01-29T16:36:08Z

Guenter at 16:34, 29 January 2021

2021-01-29T16:34:57Z

Guenter at 16:25, 29 January 2021

2021-01-29T16:25:20Z

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

2020-12-16T13:16:30Z

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

Javier: Text replacement - "Mobile Kommunikation/Technische Neuerungen von LTE" to "Mobile_Communications/Technical_Innovations_of_LTE"

2020-12-15T14:05:46Z

Text replacement - "Mobile Kommunikation/Technische Neuerungen von LTE" to "Mobile_Communications/Technical_Innovations_of_LTE"

Oezdemir at 12:43, 15 July 2020

2020-07-15T12:43:21Z

Oezdemir at 22:39, 11 July 2020

2020-07-11T22:39:16Z

← Older revision		Revision as of 12:37, 23 March 2021
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−	[[Category:~~Exercises for~~ Mobile Communications\|^4.2 Technical Innovations of LTE^]]	+	[[Category:Mobile Communications: Exercises\|^4.2 Technical Innovations of LTE^]]

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 {Which procedure is more favourable with the same load on uplink and downlink?
-|type="[]"}
+|type="()"}
 + Frequency Division Duplex (FDD),
 - Time Division Duplex (TDD).
@@ Line 54: / Line 54: @@
 '''(1)'''&nbsp; Correct is the <u>solution 2</u>:
 * As shown in the graph on the data page, only one frequency band is sufficient for TTD.
-*The other two duplex methods each require two frequency bands. In this context one also speaks of a "paired spectrum".
+*The other two duplex methods each require two frequency bands.&nbsp; In this context one also speaks of a "paired spectrum".
 '''(2)'''&nbsp; At the same load of uplink and downlink, Frequency Division Duplex (FDD) is more favourable &nbsp; &rArr; &nbsp; <u>solution 1</u>:
-*Although TDD requires only a single frequency band, only half of it can be used for uplink and downlink at the same load. Transmitter and receiver must therefore alternate during transmission.
+*Although TDD requires only a single frequency band, only half of it can be used for uplink and downlink at the same load.&nbsp; Transmitter and receiver must therefore alternate during transmission.
-*The main problem is the required, not always given synchronicity of the networks. In order to ensure largely undisturbed transmission even if synchronicity is not 100%, TDD requires guard periods between uplink and downlink use.
+*The main problem is the required but not always given synchronicity of the networks.&nbsp; In order to ensure largely undisturbed transmission even if synchronicity is not 100%, TDD requires "guard periods" between uplink and downlink use.
 *The relative degradation of the TDD principle compared to FDD is quantitatively given by the percentage of yellow blocks at the same uplink and downlink load.
@@ Line 66: / Line 66: @@
 '''(3)'''&nbsp; The <u>solutions 2 and 3</u> are applicable:
-*A TDD terminal does not have to transmit and receive simultaneously and is therefore more cost-effective than an FDD terminal. The battery life is also longer.
+*A TDD terminal does not have to transmit and receive simultaneously and is therefore more cost-effective than an FDD terminal &nbsp; &rArr; &nbsp; The battery life is longer.
 *The TDD technique allows different modes that determine how much time should be used for downlink and uplink.
-*Often the uplink requirements are much lower than the downlink requirements. With FDD there are many unused blue blocks in this case.
+*Often the uplink requirements are much lower than the downlink requirements.&nbsp; With FDD there are many unused blue blocks in this case.
-*Under this condition, the percentage degradation is reduced by the yellow ''Guard Periods''. In the limit case "no uplink activity", the same number of downlink blocks could be transmitted as with FDD, but already at half the frequency bandwidth.
+*Under this condition, the percentage degradation is reduced by the yellow "Guard Periods".&nbsp; In the limit case "no uplink activity", the same number of downlink blocks could be transmitted as with FDD, but already at half the frequency bandwidth.
 '''(4)'''&nbsp; Here the <u>solutions 2 to 4</u> apply:
-*Like FDD, half-duplex requires two frequency bands &nbsp; &rArr; &nbsp; a paired spectrum.''Guard periods'' are therefore not required.
+*Like FDD, half-duplex requires two frequency bands &nbsp; &rArr; &nbsp; a paired spectrum.&nbsp; Guard periods are therefore not required.
-*Transmitter and receiver alternate with each other. This means that the terminal devices must also either only transmit or only receive, and are therefore more cost-effective.
+*Transmitter and receiver alternate with each other.&nbsp; This means that the terminal devices must also either only transmit or only receive, and are therefore cheaper.
 *By a second connection to another terminal device with an interchanged downlink/uplink raster, the available paired band could be fully utilized.

@@ Line 39: / Line 39: @@
 |type="[]"}
 - TDD offers no advantages whatsoever.
-+ The end devices can be produced more cheaply than with FDD.
++ The end devices can be produced cheaper than with FDD.
 + TDD appoaches FDD with unequal uplink/downlink load.
@@ Line 46: / Line 46: @@
 - HD offers no advantages whatsoever.
 + The end devices can be produced cheaper than with FDD.
-+ In contrast to TDD, HD does not require&nbsp; ''Guard Periods''.
++ In contrast to TDD, HD does not require&nbsp; "Guard Periods".
 + With the same uplink/downlink requirements, HD is comparable with FDD.
 </quiz>

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 *[[Examples_of_Communication_Systems/Allgemeine_Beschreibung_von_UMTS#Vollduplexverfahren |Frequency Division Multiplex]]&nbsp; $\rm (FDD)$,
 *[[Examples_of_Communication_Systems/Allgemeine_Beschreibung_von_UMTS#Vollduplexverfahren |Time Division Multiplex]]&nbsp; $\rm (TDD)$,
-*[[Mobile_Communications/Technische_Neuerungen_von_LTE#FDD.2C_TDD_und_Halb.E2.80.93Duplex.E2.80.93Verfahren|Half&ndash;Duplex]]&nbsp; $\rm (HD)$.
+*[[Mobile_Communications/Technical_Innovations_of_LTE#FDD.2C_TDD_and_half-duplex_method|Half&ndash;Duplex]]&nbsp; $\rm (HD)$.

@@ Line 17: / Line 17: @@
 ''Note:''
-This task refers to the chapter&nbsp; [[Mobile_Communications/Technische_Neuerungen_von_LTE|Technische Neuerungen von LTE]].
+This task refers to the chapter&nbsp; [[Mobile_Communications/Technical_Innovations_of_LTE|Technical Innovations of LTE]].
@@ Line 25: / Line 25: @@
 <quiz display=simple>
-{Which duplex methods can be managed with one frequency band?
+{Which duplex methods can be managed with only one frequency band?
 |type="[]"}
 - Frequency Division Duplex (FDD),
@@ Line 40: / Line 40: @@
 - TDD offers no advantages whatsoever.
 + The end devices can be produced more cheaply than with FDD.
-+ TDD is lower with unequal uplink/downlink load.
++ TDD appoaches FDD with unequal uplink/downlink load.
 {What advantages does the half-duplex process offer?
 |type="[]"}
 - HD offers no advantages whatsoever.
-+ The end devices can be produced more cheaply than with FDD.
++ The end devices can be produced cheaper than with FDD.
 + In contrast to TDD, HD does not require&nbsp; ''Guard Periods''.
 + With the same uplink/downlink requirements, HD is comparable with FDD.

@@ Line 3: / Line 3: @@
 }}
-[[File:P_ID2280__Mob_A_4_2_version1.png|right|frame|Diagrams for <br>FDD, TDD and HD]]
+[[File:P_ID2280__Mob_A_4_2_version1.png|right|frame|FDD, TDD, and HD]]
-Duplex processes are required in mobile radio to ensure that the uplink (UL) and downlink (DL) are clearly separated from each other and thus do not interfere with each other. According to the graphic, a distinction is made between
+Duplex processes are required in mobile radio to ensure that the uplink&nbsp; $\rm (UL)$&nbsp; and downlink&nbsp; $\rm (DL)$&nbsp; are clearly separated and thus do not interfere with each other.&nbsp; According to the graphic, a distinction is made between
-*[[Examples_of_Communication_Systems/Allgemeine_Beschreibung_von_UMTS#Vollduplexverfahren |Frequency Division Multiplex]]&nbsp; (FDD),
+*[[Examples_of_Communication_Systems/Allgemeine_Beschreibung_von_UMTS#Vollduplexverfahren |Frequency Division Multiplex]]&nbsp; $\rm (FDD)$,
-*[[Examples_of_Communication_Systems/Allgemeine_Beschreibung_von_UMTS#Vollduplexverfahren |Time Division Multiplex]]&nbsp; (TDD),
+*[[Examples_of_Communication_Systems/Allgemeine_Beschreibung_von_UMTS#Vollduplexverfahren |Time Division Multiplex]]&nbsp; $\rm (TDD)$,
-*[[Mobile_Communications/Technische_Neuerungen_von_LTE#FDD.2C_TDD_und_Halb.E2.80.93Duplex.E2.80.93Verfahren|Halb–Duplexverfahren]]&nbsp; (HD).
+*[[Mobile_Communications/Technische_Neuerungen_von_LTE#FDD.2C_TDD_und_Halb.E2.80.93Duplex.E2.80.93Verfahren|Half&ndash;Duplex]]&nbsp; $\rm (HD)$.
-The first two duplex processes have already been used in&nbsp; [[Examples_of_Communication_Systems/Allgemeine_Beschreibung_von_UMTS|UMTS]]&nbsp;.On the other hand, the half-duplex process is an innovation in&nbsp; ''Long Term Evolution''&nbsp; (LTE).
+The first two duplex processes have already been used in&nbsp; [[Examples_of_Communication_Systems/Allgemeine_Beschreibung_von_UMTS|$\rm UMTS$]].&nbsp; On the other hand, the half-duplex process is an innovation in&nbsp; Long Term Evolution &nbsp; $\rm (LTE)$.
+''Note:''
 This task refers to the chapter&nbsp; [[Mobile_Communications/Technische_Neuerungen_von_LTE|Technische Neuerungen von LTE]].

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 </quiz>
-===Sample solution===
+===Solution===
 {{ML-Kopf}}
 '''(1)'''&nbsp; Correct is the <u>solution 2</u>:

← Older revision		Revision as of 14:05, 15 December 2020
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−	{{quiz-Header\|Buchseite=~~Mobile Kommunikation~~/~~Technische Neuerungen von LTE~~	+	{{quiz-Header\|Buchseite=Mobile_Communications/Technical_Innovations_of_LTE
	}}		}}

← Older revision		Revision as of 12:43, 15 July 2020
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−	~~Die beiden erstgenannten Duplexverfahren fanden bereits bei~~  [[Examples_of_Communication_Systems/Allgemeine_Beschreibung_von_UMTS\|UMTS]]  ~~Verwendung~~. ~~Das Halb–Duplexverfahren ist dagegen eine Neuerung bei~~  ''Long Term Evolution''  (LTE).	+	The first two duplex processes have already been used in  [[Examples_of_Communication_Systems/Allgemeine_Beschreibung_von_UMTS\|UMTS]] .On the other hand, the half-duplex process is an innovation in  ''Long Term Evolution''  (LTE).