Aufgaben:Exercise 4.3: UMTS Access Level - Revision history

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	^]]		^]]
	[[de:Aufgaben:4.~~3_UMTS–Zugangsebene~~]]		[[de:Aufgaben:Aufgabe 4.3: UMTS–Zugangsebene]]

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	*${\rm UTRAN}$  $($"UMTS Terrestrial Radio Access Network",  upper graph$)$:  This monitors the radio transmission between the radio network layer and the transport layer;		*${\rm UTRAN}$  $($"UMTS Terrestrial Radio Access Network",  upper graph$)$:  This monitors the radio transmission between the radio network layer and the transport layer;

	*${\rm CN}$$($"Core Network", lower graph$)$:  This is responsible for switching data within the UMTS network.		*${\rm CN}$("Core Network", lower graph$)$:  This is responsible for switching data within the UMTS network.

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	^]]		^]]
			[[de:Aufgaben:4.3_UMTS–Zugangsebene]]

Guenter at 13:49, 15 February 2023

2023-02-15T13:49:06Z

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	Hints:		<u>Hints:</u>
	*The exercise belongs to the chapter  [[Examples_of_Communication_Systems/UMTS_Network_Architecture\|"UMTS Network Architecture"]].		*The exercise belongs to the chapter  [[Examples_of_Communication_Systems/UMTS_Network_Architecture\|"UMTS Network Architecture"]].

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	'''(1)'''  Correct is <u> Answer 3</u>: UMTS networks support:		'''(1)'''  Correct is the  <u>Answer 3</u>:  UMTS networks support:
	*Circuit switching (~~English: ''~~CS''): in this case, the radio channel is not available to other users during the entire switching period.		*Circuit-switching  $\rm (CS)$:  In this case,  the radio channel is not available to other users during the entire switching period.
	*Packet switching (PS): The data stream is divided into small data packets in the transmitter and then sent together with other packets. The channel can thus be shared by several users.

			*Packet-switching  $\rm (PS)$:  The data stream is divided into small data packets in the transmitter and then sent together with other packets.  The channel can thus be shared by several users.

	~~'''(2)'''  Correct <u> Answers 1 and 2</u>:~~
	*As can be seen from the diagram, UTRAN includes various base stations, usually called ''Node B'' in UMTS, and various ''Radio Network Controllers'' in each case.
	*The MSC (''Mobile Service Switching Center'') is a part of the core network.


	'''(3)'''  Correct <u> Answers 1 and 2</u>:		'''(2)'''  Correct are the  <u>Answers 1 and 2</u>:
	*~~The ''Home Location Register'' (HLR) contains all subscriber data~~, ~~for example~~, ~~rate model, telephone number, service-specific authorizations~~, and ~~keys of a network operator's own customers~~.		*As can be seen from the diagram,  UTRAN includes various base stations,  usually called  "Node B"  in UMTS,  and various  "Radio Network Controllers"  in each case.
	*In contrast, the ''Visitor Location Register'' contains information about locally registered users and copies of the records from the HLR of its network operator.
	*~~This data is dynamic: as soon as the subscriber changes his location, this information is changed.~~		*$\rm MSC$  $($"Mobile Service Switching Center"$)$  is a part of the core network.
	*The GPRS register (GR) is part of the ~~HLR. It contains additional subscriber information, but it is only needed for packet-switched transmission~~.


	'''(4)'''  Correct <u> Answers 1 and 3</u>:
	*The ''Gateway Mobile Switching Center'' (GMSC) is the switching center in mobile systems for forwarding data to the (circuit-switched) fixed network.		'''(3)'''  Correct are the  <u>Answers 1 and 2</u>:
	*For packet data networks such as the Internet, the ''Gateway GRRS Support Node'' (GGSN) is responsible for this.		*The  "Home Location Register"  $\rm HLR$  contains all subscriber data,  for example  rate model,  telephone number,  service-specific authorizations,  and keys of a network operator's own customers.
	*The ''Serving GRRS Support Node'' (SGSN) has similar tasks for packet switching as the MSC and the HLR have for circuit-switched transmission.
			*In contrast, the  "Visitor Location Register"  $\rm VLR$  contains information about locally registered users and copies of the records from the HLR of its network operator.

			*This data is dynamic:  As soon as the subscriber changes his location,  this information is changed.

			*The GPRS register  $\rm (GR)$  is part of the HLR.  It contains additional subscriber information,  but it is only needed for packet-switched transmission.



			'''(4)'''  Correct are the  <u>Answers 1 and 3</u>:
			*The  "Gateway Mobile Switching Center"  $\rm (GMSC)$  is the switching center in mobile systems for forwarding data to the  $($circuit-switched$)$  fixed network.

			*For packet data networks such as the Internet,  the  "Gateway GRRS Support Node"  $\rm (GGSN)$  is responsible for this.

			*The  "Serving GRRS Support Node"  $\rm (SGSN)$  has similar tasks for packet-switching as the MSC and the HLR have for circuit-switched transmission.

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Guenter at 15:56, 14 February 2023

2023-02-14T15:56:01Z

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	[[File:EN_Bei_A_4_3_v2.png\|right\|frame\|UMTS access network]]		[[File:EN_Bei_A_4_3_v2.png\|right\|frame\|UMTS access network]]
	The figure shows the UMTS access network with the two main blocks:		The figure shows the UMTS access network with the two main blocks:
	*${\rm UTRAN}$ (''UMTS Terrestrial Radio Access Network'', upper ~~graphic~~): This monitors the radio transmission between the radio network layer and the transport layer;		*${\rm UTRAN}$  $($"UMTS Terrestrial Radio Access Network",  upper graph$)$:  This monitors the radio transmission between the radio network layer and the transport layer;
	*${\rm ~~Core \ Network~~}$ (CN, lower ~~graphic~~): This is responsible for switching data within the UMTS network.
			*${\rm CN}$$($"Core Network", lower graph$)$:  This is responsible for switching data within the UMTS network.


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	Hints:		Hints:
	*The exercise belongs to the chapter [[Examples_of_Communication_Systems/UMTS_Network_Architecture\|"UMTS Network Architecture"]].		*The exercise belongs to the chapter  [[Examples_of_Communication_Systems/UMTS_Network_Architecture\|"UMTS Network Architecture"]].
	*Reference is made in particular to the ~~page~~ [[Examples_of_Communication_Systems/UMTS_Network_Architecture#Access_level_architecture\|"Access level architecture"]].
			*Reference is made in particular to the section  [[Examples_of_Communication_Systems/UMTS_Network_Architecture#Access_level_architecture\|"Access level architecture"]].


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	{Which switching types are supported by UMTS?		{Which switching types are supported by UMTS?
	\|type="[]"}		\|type="[]"}
	- Circuit switching only,		- Circuit-switching only,
	- packet switching only,		- packet-switching only,
	+ both circuit switching and packet switching.		+ both circuit-switching and packet-switching.

	{What does UTRAN include?		{What does UTRAN include?
	\|type="[]"}		\|type="[]"}
	+ The base stations,		+ The base stations,
	+ the ''Radio Network Controller,''		+ the  "Radio Network Controller"  $\rm (RNC)$,
	- the ''Mobile Service Switching Center.''		- the  "Mobile Service Switching Center"  $\rm (MSC)$.

	{Which registers are required for circuit switching?		{Which registers are required for circuit-switching?
	\|type="[]"}		\|type="[]"}
	+ the ''Home Location Register,''		+ the  "Home Location Register"  $\rm (HLR)$,
	+ the ''Visitor Location Register,''		+ the  "Visitor Location Register"  $\rm (VLR)$,
	- the GPRS register.		- the GPRS register.

	{Which of the following statements are true?		{Which of the following statements are true?
	\|type="[]"}		\|type="[]"}
	+ GMSC and GGSN forward to other data networks.		+ $\rm GMSC$  and  $\rm GGSN$  forward to other data networks.
	- GMSC and GGSN are active only when there is circuit switching.		- $\rm GMSC$  and  $\rm GGSN$  are active only when there is circuit-switching.
	+ SGSN has a similar function to MSC and HLR.		+ $\rm SGSN$  has a similar function to  $\rm MSC$  and  $\rm HLR$.

Guenter at 15:27, 13 February 2023

2023-02-13T15:27:29Z

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	}}		}}

	[[File:~~P_ID1933__Bei_A_4_3~~.png\|right\|frame\|UMTS access network]]		[[File:EN_Bei_A_4_3_v2.png\|right\|frame\|UMTS access network]]
	The figure shows the UMTS access network with the two main blocks:		The figure shows the UMTS access network with the two main blocks:
	*${\rm UTRAN}$ (''UMTS Terrestrial Radio Access Network'', upper graphic): This monitors the radio transmission between the radio network layer and the transport layer;		*${\rm UTRAN}$ (''UMTS Terrestrial Radio Access Network'', upper graphic): This monitors the radio transmission between the radio network layer and the transport layer;

Noah at 01:20, 13 February 2023

2023-02-13T01:20:45Z

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Guenter at 14:56, 24 January 2023

2023-01-24T14:56:09Z

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	[[Category:Examples of Communication Systems: Exercises\|^4.2 ~~UMTS–Netzarchitektur~~		[[Category:Examples of Communication Systems: Exercises\|^4.2 UMTS Network Architecture

	^]]		^]]

Guenter: Guenter moved page Aufgaben:Aufgabe 4.3: UMTS–Zugangsebene to Aufgaben:Exercise 4.3: UMTS Access Level

2023-01-24T14:34:25Z

Guenter moved page Aufgaben:Aufgabe 4.3: UMTS–Zugangsebene to Aufgaben:Exercise 4.3: UMTS Access Level

← Older revision	Revision as of 16:34, 24 January 2023
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2021-05-28T14:41:55Z

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	'''(2)'''  Richtig sind die <u> Antworten 1 und 2</u>:		'''(2)'''  Richtig sind die <u> Antworten 1 und 2</u>:
	*Wie aus der Grafik zu ersehen ist, gehören zu UTRAN verschiedene Basisstationen, die bei UMTS meist "Node B~~”~~ genannt werden, sowie jeweils verschiedene ''Radio Network Controller''.		*Wie aus der Grafik zu ersehen ist, gehören zu UTRAN verschiedene Basisstationen, die bei UMTS meist "Node B" genannt werden, sowie jeweils verschiedene ''Radio Network Controller''.
	*Das MSC (''Mobile Service Switching Center'') ist ein Teil des Core Networks.		*Das MSC (''Mobile Service Switching Center'') ist ein Teil des Core Networks.