Aufgaben:Exercise 3.8: General Packet Radio Service - Revision history

Guenter at 17:30, 28 January 2023

2023-01-28T17:30:24Z

Guenter at 16:52, 28 January 2023

2023-01-28T16:52:28Z

Noah at 22:59, 21 January 2023

2023-01-21T22:59:24Z

Noah at 22:58, 21 January 2023

2023-01-21T22:58:14Z

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Guenter at 13:24, 2 January 2023

2023-01-02T13:24:58Z

Guenter: Guenter moved page Aufgaben:Aufgabe 3.8: General Packet Radio Service to Aufgaben:Exercise 3.8: General Packet Radio Service

2023-01-02T13:23:37Z

Guenter moved page Aufgabe 3.8: General Packet Radio Service to Exercise 3.8: General Packet Radio Service

Javier: Text replacement - "„" to """

2021-05-28T14:32:31Z

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Javier: Text replacement - "”" to """

2021-05-28T14:31:27Z

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Javier: Text replacement - "Category:Aufgaben zu Beispiele von Nachrichtensystemen" to "Category:Examples of Communication Systems: Exercises"

2021-03-23T12:53:23Z

Text replacement - "Category:Aufgaben zu Beispiele von Nachrichtensystemen" to "Category:Examples of Communication Systems: Exercises"

Javier: Text replacement - "[[Beispiele_von_Nachrichtensystemen" to "[[Examples_of_Communication_Systems"

2020-07-09T13:00:04Z

Text replacement - "[[Beispiele_von_Nachrichtensystemen" to "[[Examples_of_Communication_Systems"

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 ===Solution===
 {{ML-Kopf}}
-'''(1)'''&nbsp; Correct is the <u>proposed solution 2</u>:
+'''(1)'''&nbsp; Correct is the&nbsp; <u>proposed solution 2</u>:
-:With "GPRS", packet-oriented data transmission was realized for the first time.
+:With "GPRS",&nbsp; packet-oriented data transmission was realized for the first time.
-'''(2)'''&nbsp; Correct are <u>proposed solutions 1 and 3</u>:
+'''(2)'''&nbsp; Correct are the&nbsp; <u>proposed solutions 1 and 3</u>:
-*In order to integrate GPRS, the existing GSM system architecture had to be extended by GPRS ''Support Nodes'' (GSN).
+*In order to integrate GPRS,&nbsp; the existing GSM system architecture had to be extended by&nbsp; "GPRS Support Nodes"&nbsp; $\rm (GSN)$.
-*A distinction is made between ''Gateway GSN'' (GGSN) and ''Serving GSN'' (SGSN), which communicate with each other over an IP-based GPRS backbone network.
-*SGSN is responsible for mobility management and performs a similar function for packet data services as the ''Mobile Switching Center'' (MSC) does for connection-oriented voice transmission.
+*A distinction is made between&nbsp; "Gateway GSN"&nbsp; $\rm  (GGSN)$ and&nbsp; "Serving GSN" $\rm  (SGSN)$,&nbsp; which communicate with each other over an IP-based GPRS backbone network.
 *GGSN, on the other hand, is the interface to the supported foreign packet-oriented data networks.
-'''(3)'''&nbsp; Correct are <u>proposed solutions 1 and 2</u>:
+'''(3)'''&nbsp; Correct are the&nbsp; <u>proposed solutions 1 and 2</u>:
-*The first thing a GPRS cell phone does when it is turned on is to perform a "cell selection" by searching for a frequency channel containing GPRS data.
+*The first thing a GPRS cell phone does when it is turned on is to perform a&nbsp; "cell selection"&nbsp; by searching for a frequency channel containing GPRS data.
 *The uplink and the downlink are allocated separately and the physical channels are reserved only for the duration of the transmission of data packets and then released again.
-'''(5)'''&nbsp; In GPRS, up to eight time slots can be combined.
+'''(5)'''&nbsp; In GPRS,&nbsp; up to eight time slots can be combined.
-*With the coding scheme $\rm CS-4$, which, however, is only used with a very good channel, the data rate per time slot is $21.4 \rm kbit/s$.
+*With the coding scheme&nbsp; $\text{ CS-4}$,&nbsp; which,&nbsp; however,&nbsp; is only used with a very good channel,&nbsp; the data rate per time slot is $21.4 \ \rm kbit/s$.
 *This allows a maximum gross data rate of $21.4 \ {\rm kbit/s} \cdot 8 \hspace{0.15cm}\underline{ = 171.2 \ \rm  kbit/s}$.
-'''(6)'''&nbsp; For convolutional coding, a code with code rate $R_{\rm C} = 1/2$ is used. This doubles $294$ bits to $588$ bits.
+'''(6)'''&nbsp; For convolutional coding,&nbsp; a code with code rate&nbsp; $R_{\rm C} = 1/2$&nbsp; is used.&nbsp; This doubles&nbsp; $294$&nbsp; bits to&nbsp; $588$&nbsp; bits result.
-*After that, $132$ bits are punctured, so that finally a codeword of length $456$ bits.
-*This gives a resulting code rate of convolutional code including puncturing of about $R_{\rm C}\hspace{0.05cm}' = 294/456 \hspace{0.15cm}\underline{ = 0.644} \approx 2/3$.
+*After that,&nbsp; $132$&nbsp; bits are punctured,&nbsp; so that finally a code word of length&nbsp; $456$&nbsp; bits.
-'''(7)'''&nbsp; The net data rate of a GPRS user is exactly the same as the net data rate of a GSM user.
+'''(7)'''&nbsp; The net data rate of a GPRS user is exactly the same as the net data rate of a GSM user:
-* This is $456 \ {\rm  Bit}/20 \ \rm ms$ per voice frame &nbsp; &rArr; &nbsp; $R_{\rm net} \underline{= 22.8 \ \rm kbit/s}$.
+* This is&nbsp; $456 \ {\rm  bit}/20 \ \rm ms$&nbsp; per speech frame &nbsp; &rArr; &nbsp; $R_{\rm net} \underline{= 22.8 \ \rm kbit/s}$.
 {{ML-Fuß}}

@@ Line 3: / Line 3: @@
 }}
-[[File:P_ID1241__Bei_A_3_8.png|right|frame|Schematic "General Packet Radio Service"]]
+[[File:P_ID1241__Bei_A_3_8.png|right|frame|Scheme&nbsp; "General Packet Radio Service"]]
-In the&nbsp; $\rm GSM phase \ 2+$&nbsp; the GSM extension&nbsp; $\rm GPRS$ (''General Packet Radio Service'') was developed and standardized to improve data services. This
+In the&nbsp; $\rm GSM phase \ 2+$&nbsp; the GSM extension&nbsp; $\rm GPRS$&nbsp; $($"General Packet Radio Service"$)$&nbsp; was developed and standardized to improve data services.&nbsp; This
-*supports several transmission protocols,
+#supports several transmission protocols,
-*offers packet-oriented data transmission,
+#offers packet-oriented data transmission,
-*allows users to communicate with foreign data networks (for example:&nbsp; the&nbsp; ''Internet'').
+#allows users to communicate with foreign data networks,&nbsp; e.g. the&nbsp; "Internet".
-A GPRS mobile subscriber benefits from shorter access times and the higher data rate compared to data transmission in traditional GSM or HSCSD, which also emerged in the&nbsp; $2+$&nbsp; phase.
+A GPRS mobile subscriber benefits from shorter access times and the higher data rate compared to data transmission in traditional GSM or HSCSD, which also emerged in the&nbsp; "$2+$"&nbsp; standardization phase.
-Before the introduction of GPRS, some modifications and additions to the GSM network were necessary:
+Before the introduction of GPRS,&nbsp; some modifications and additions to the GSM network were necessary:
-*In order to integrate GPRS applications into the existing GSM system architecture,&nbsp; ''Serving GPRS Support Nodes''&nbsp; (SGSN) and&nbsp; ''Gateway GPRS Support Nodes''&nbsp; (GGSN) had to be implemented (see diagram).
+*In order to integrate GPRS applications into the existing GSM system architecture,&nbsp; "serving GPRS support nodes"&nbsp; $\rm (SGSN)$&nbsp; and&nbsp; "gateway GPRS support nodes"&nbsp; &nbsp; $\rm (GGSN)$&nbsp; had to be implemented&nbsp; $($see diagram$)$.
 Hint:
 *This exercise belongs to the chapter&nbsp; [[Examples_of_Communication_Systems/Further_Developments_of_the_GSM|"Further Developments of the GSM
 "]].
-*The above graphic is taken from the article mentioned below. We thank the authors for the release:
+*The above graphic is taken from the article mentioned below.&nbsp; We thank the authors for the release:
-::Bettstetter, C.; Vögel, H.J.; Eberspächer, J.: ''GSM Phase 2+ General Packet Radio Service GPRS: Architecture, Protocols, and Air Interface''. <br>In: IEEE Communications Surveys & Tutorials, Vol. 2 (1999) No. 3, S. 2-14.
+::Bettstetter, C.; Vögel, H.J.; Eberspächer, J.:&nbsp; GSM Phase 2+ General Packet Radio Service GPRS: Architecture, Protocols, and Air Interface.&nbsp; <br>In: IEEE Communications Surveys & Tutorials, Vol. 2 (1999) No. 3, S. 2-14.
@@ Line 37: / Line 43: @@
 {How can the GPRS data transmission be characterized?
 |type="()"}
-- circuit-switched,
+- Circuit-switched,
 + packet-switched.
@@ Line 49: / Line 55: @@
 {How to set the GPRS services?
 |type="[]"}
-+ By performing the "Cell Selection" procedure.
++ By performing the&nbsp; "Cell Selection"&nbsp; procedure.
 + Switching depends on the cell phone class.
 - All cell phones switch dynamically between GSM and GPRS.
@@ Line 55: / Line 61: @@
 {What are the advantages of GPRS over GSM?
 |type="[]"}
-+ With GPRS, you can combine up to eight time slots.
++ With GPRS,&nbsp; you can combine up to eight time slots.
 - The physical channel remains reserved for the call duration.
 + Uplink and downlink are assigned separately.
@@ Line 61: / Line 67: @@
 {What is the theoretical maximum GPRS bit rate?
 |type="{}"}
-$R_{\rm Gross} \ = \ $ { 171.2 3% } $ \ \rm kbit/s$
+$R_{\rm gross} \ = \ $ { 171.2 3% } $ \ \rm kbit/s$
-{What is the resulting GPRS code rate (convolutional code + puncturing)?
+{What is the resulting GPRS code&nbsp; $($convolutional code + puncturing$)$?
 |type="{}"}
 $R_{\rm C}\hspace{0.05cm}' \ = \ $ { 0.644 3% }
@@ Line 69: / Line 75: @@
 { What is the net data rate of a single GPRS user?
 |type="{}"}
-$R_{\rm Netto} \ = \ $ { 22.8 3% } $ \ \rm kbit/s$
+$R_{\rm net} \ = \ $ { 22.8 3% } $ \ \rm kbit/s$
 </quiz>

@@ Line 102: / Line 102: @@
 '''(5)'''&nbsp; In GPRS, up to eight time slots can be combined.
 *With the coding scheme $\rm CS-4$, which, however, is only used with a very good channel, the data rate per time slot is $21.4 \rm kbit/s$.
-*This allows a maximum gross data rate of $21.4 \rm kbit/s} \cdot 8 \hspace{0.15cm}\underline{ = 171.2 \ \rm kbit/s}$.
+*This allows a maximum gross data rate of $21.4 \ {\rm kbit/s} \cdot 8 \hspace{0.15cm}\underline{ = 171.2 \ \rm  kbit/s}$.
@@ Line 113: / Line 113: @@
 '''(7)'''&nbsp; The net data rate of a GPRS user is exactly the same as the net data rate of a GSM user.
-* This is $456 \{\rm bit}/20 \ \rm ms$ per voice frame &nbsp; &rArr; &nbsp; $R_{\rm net} \underline{= 22.8 \ \rm kbit/s}$.
+* This is $456 \ {\rm  Bit}/20 \ \rm ms$ per voice frame &nbsp; &rArr; &nbsp; $R_{\rm net} \underline{= 22.8 \ \rm kbit/s}$.
 {{ML-Fuß}}

← Older revision		Revision as of 13:24, 2 January 2023
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−	[[Category:Examples of Communication Systems: Exercises\|^3.5 ~~Weiterentwicklungen des~~ GSM^]]	+	[[Category:Examples of Communication Systems: Exercises\|^3.5 Further Developments of GSM^]]

@@ Line 3: / Line 3: @@
 }}
-[[File:P_ID1241__Bei_A_3_8.png|right|frame|Schaubild &bdquo;General Packet Radio Service"]]
+[[File:P_ID1241__Bei_A_3_8.png|right|frame|Schaubild "General Packet Radio Service"]]
 In der&nbsp; $\rm GSM–Phase \ 2+$&nbsp; wurde zur Verbesserung der Datendienste die GSM–Erweiterung&nbsp; $\rm GPRS$ (''General Packet Radio Service'') entwickelt und standardisiert. Diese
 *unterstützt mehrere Übertragungsprotokolle,

← Older revision	Revision as of 13:23, 2 January 2023
(No difference)

← Older revision		Revision as of 12:53, 23 March 2021
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−	[[Category:~~Aufgaben zu Beispiele von Nachrichtensystemen~~\|^3.5 Weiterentwicklungen des GSM^]]	+	[[Category:Examples of Communication Systems: Exercises\|^3.5 Weiterentwicklungen des GSM^]]

@@ Line 25: / Line 25: @@
 ''Hinweise:''
-*Die Aufgabe gehört zum Kapitel&nbsp; [[Beispiele_von_Nachrichtensystemen/Weiterentwicklungen_des_GSM|Weiterentwicklungen des GSM
+*Die Aufgabe gehört zum Kapitel&nbsp; [[Examples_of_Communication_Systems/Weiterentwicklungen_des_GSM|Weiterentwicklungen des GSM
 ]].