Exercise 3.1: GSM Network Components - Revision history

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	[[Category:Examples of Communication Systems: Exercises\|^3.1 General Description of GSM		[[Category:Examples of Communication Systems: Exercises\|^3.1 General Description of GSM
	^]]		^]]
	[[de:3.~~1_GSM–Netzkomponenten~~]]		[[de:Aufgabe 3.1: GSM–Netzkomponenten]]

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	[[Category:Examples of Communication Systems: Exercises\|^3.1 General Description of GSM		[[Category:Examples of Communication Systems: Exercises\|^3.1 General Description of GSM
	^]]		^]]
			[[de:3.1_GSM–Netzkomponenten]]

Guenter at 15:51, 7 January 2023

2023-01-07T15:51:41Z

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	===Solution===		===Solution===
	{{ML-Kopf}}		{{ML-Kopf}}
	'''(1)'''  Correct is the <u>proposed solution 1</u>:		'''(1)'''  Correct is the  <u>proposed solution 1</u>:
	*Each mobile station (MS) is in radio communication with a ~~''Base Transceiver Station''~~ (BTS).		*Each mobile station  $\rm (MS)$  is in radio communication with a base transceiver station  $\rm (BTS)$.
	*This is part of the ~~''Base Station Subsystem''~~ (BSS).
			*This is part of the base station subsystem  $\rm (BSS)$.



	'''(2)'''  Correct are the <u>proposed solutions 1 and 3</u>:		'''(2)'''  Correct are the  <u>proposed solutions 1 and 3</u>:
	*In contrast, proposed solution 2 is incorrect: ~~The BTS is not responsible for switching tasks, but this is the exercise of a ''Mobile Switching Center'' (MSC), which is a part of the ''Switching and Management Subsystem'' (SMSS).~~		*In contrast,  proposed solution 2 is incorrect:

			*The BTS is not responsible for switching tasks,  but this is the task of a mobile switching center  $\rm (MSC)$,  <br>which is a part of the switching and management subsystem  $\rm (SMSS)$.


	~~'''(3)'''  In GSM, the individual antennas usually cover $120^\circ$ sectors. This also means that a BTS can provide up to <u>three radio channels</u>.~~

			'''(3)'''  In GSM,  the individual antennas usually cover  $120^\circ$  sectors.
			*This also means that a BTS can provide up to  <u>three radio channels</u>.


	~~'''(4)'''  The correct <u>proposed solution 3</u> is:~~
	*Only the ''Operation and Management Center'' (OMC) is part of the OMSS.
	*In contrast, MSC and GMSC are components of the mobile switching network (SMSS).
	*With respect to the OMC, a further distinction is made between OMC-B (for BSS monitoring) and OMC-S (for SMSS monitoring).

			'''(4)'''  Correct is  <u>the proposed solution 3</u>:
			*Only the operation and management center  $\rm (OMC)$  is part of the OMSS.

			*In contrast,  MSC and GMSC are components of the mobile switching subsystem  $\rm (SMSS)$.

			*With respect to the OMC,  a further distinction is made between  $\text{OMC-B}$  $($for BSS monitoring$)$  and  $\text{OMC-S}$  $($for SMSS monitoring$)$.


	'''(5)'''  Correct are <u>proposed solutions 1, 3 and 4</u>:
	*GMSC is a hardware unit responsible for switching between the fixed and mobile networks.		'''(5)'''  Correct are the  <u>proposed solutions 1, 3 and 4</u>:
			*GMSC is a hardware unit responsible for switching between the fixed and mobile networks.

	*The other three terms given describe databases of the SMSS.		*The other three terms given describe databases of the SMSS.
	*AUC is responsible for storing confidential data and keys.		#AUC is responsible for storing confidential data and keys.
	*HLR is a central register for the entire ''Public Land Mobile Network'' (PLMN) for managing unencrypted subscriber data, subscribed services, and routing for calls of a mobile operator's own subscribers.		#HLR is a central register for the entire  "Public Land Mobile Network"  $\rm (PLMN)$  for managing unencrypted subscriber data,  subscribed services, and routing for calls of a mobile operator's own subscribers.
	*In contrast, the visitor register (VLR) stores information about the current visitors of other operators who are in the current PLMN.		#In contrast,  the visitor register  $\rm (VLR)$  stores information about the current visitors of other operators who are in the current PLMN.

	{{ML-Fuß}}		{{ML-Fuß}}

Guenter at 15:31, 7 January 2023

2023-01-07T15:31:59Z

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	[[File:EN_Bei_A_3_1.png\|right\|frame\|GSM:  Base Station Subsystem]]		[[File:EN_Bei_A_3_1.png\|right\|frame\|GSM:  Base Station Subsystem]]

	The network infrastructure in the 2G mobile communications standard  ''Global System for Mobile Communications''  ~~- GSM for short - includes the following subsystems~~		The network infrastructure in the 2G mobile communications standard  "Global System for Mobile Communications"  – $\rm GSM$,  for short –  includes the following subsystems:
	* Base Station Subsystem&~~nbsp~~; ~~('''BSS'')~~,		* Base Station Subsystem  $\rm (BSS)$,
	* Switching & Management Subsystem  ~~('''SMSS''),~~
	* Operation & ~~Maintenance Subsystem~~  ~~('''OMSS'').~~


	~~The "BSS" is essentially responsible for the GSM radio network (see diagram), while "SMSS" represents~~ the ~~switching network and "OMSS" is responsible for operations and maintenance.~~

	~~The~~ following ~~terms continue to be used in the questions for this exercise~~:
	*Authentication Center  ('''AUC'''),
	*Base Station ~~Controller~~  (~~'''BSC'''),~~
	*Base Transceiver Station  ('''BTS'''),
	*Gateway Mobile Switching Center  ('''GMSC'''),
	*Home Location Register  ('''HLR'''),
	*Mobile Switching Center  ('''MSC'''),
	*Operation and Maintenance Center  ('''OMC'''),
	*Visitor Location Register  ('''VLR''').


			* Switching & Management Subsystem  $\rm (SMSS)$,

			* Operation & Maintenance Subsystem  $\rm (OMSS)$.


			The base station subsystem is essentially responsible for the GSM radio network  (see diagram),  while the SMSS represents the switching network and the OMSS is responsible for operations and maintenance.

			The following terms continue to be used in the questions for this exercise:
			#Authentication Center  $\rm (AUC)$,
			#Base Station Controller  $\rm (BSC)$,
			#Base Transceiver Station  $\rm (BTS)$,
			#Gateway Mobile Switching Center  $\rm (GMSC)$,
			#Home Location Register  $\rm (HLR)$,
			#Mobile Switching Center  $\rm (MSC)$,
			#Operation and Maintenance Center  $\rm (OMC)$,
			#Visitor Location Register  $\rm (VLR)$.



	~~Hint:~~

	*This exercise belongs to the chapter  [[Examples_of_Communication_Systems/General_Description_of_GSM\|"General Description of GSM"]].		<u>Hint:</u>  This exercise belongs to the chapter  [[Examples_of_Communication_Systems/General_Description_of_GSM\|"General Description of GSM"]].


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	- OMSS.		- OMSS.

	{Which statements are true for a ~~''Base Transceiver Station''~~ (BTS)?		{Which statements are true for a base transceiver station  $\rm (BTS)$?
	\|type="[]"}		\|type="[]"}
	+ BTS is the transmitting and receiving equipment of the base station.		+ BTS is the transmitting and receiving equipment of the base station.
	- The ~~exercise~~ of the BTS is the switching of calls.		- The task of the BTS is the switching of calls.
	+ Usually several BTS are subordinated to a common BSC.		+ Usually several BTS are subordinated to a common BSC.

	{How many channels (antennas) can a BTS support simultaneously?		{How many channels  $($antennas$)$  can a BTS support simultaneously?
	\|type="{}"}		\|type="{}"}
	$N_{\rm max} \ = \ $ { 3 3% }		$N_{\rm max} \ = \ $ { 3 3% }

Guenter at 16:09, 3 January 2023

2023-01-03T16:09:17Z

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	}}		}}

	[[File:~~P_ID1187__Bei_A_3_1~~.png\|right\|frame\|GSM:  Base Station Subsystem ~~'''Korrektur'''~~]]		[[File:EN_Bei_A_3_1.png\|right\|frame\|GSM:  Base Station Subsystem]]

	The network infrastructure in the 2G mobile communications standard  ''Global System for Mobile Communications''  - GSM for short - includes the following subsystems		The network infrastructure in the 2G mobile communications standard  ''Global System for Mobile Communications''  - GSM for short - includes the following subsystems

Guenter at 14:04, 2 January 2023

2023-01-02T14:04:24Z

← Older revision		Revision as of 16:04, 2 January 2023
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	}}		}}

	[[File:P_ID1187__Bei_A_3_1.png\|right\|frame\|GSM:  Base Station Subsystem]]		[[File:P_ID1187__Bei_A_3_1.png\|right\|frame\|GSM:  Base Station Subsystem '''Korrektur''']]

	The network infrastructure in the 2G mobile communications standard  ''Global System for Mobile Communications''  - GSM for short - includes the following subsystems		The network infrastructure in the 2G mobile communications standard  ''Global System for Mobile Communications''  - GSM for short - includes the following subsystems

Guenter at 16:22, 31 December 2022

2022-12-31T16:22:43Z

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	[[Category:Examples of Communication Systems: Exercises\|^3.1 ~~Allgemeine Beschreibung von~~ GSM		[[Category:Examples of Communication Systems: Exercises\|^3.1 General Description of GSM
	^]]		^]]

Guenter: Guenter moved page Aufgabe 3.1: GSM–Netzkomponenten to Exercise 3.1: GSM Network Components

2022-12-31T16:20:20Z

Guenter moved page Aufgabe 3.1: GSM–Netzkomponenten to Exercise 3.1: GSM Network Components

← Older revision	Revision as of 18:20, 31 December 2022
(No difference)

Noah at 20:00, 29 December 2022

2022-12-29T20:00:27Z

Show changes

Javier: Text replacement - "”" to """

2021-05-28T14:24:51Z

Text replacement - "”" to """

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	Das "BSS~~”~~ ist im Wesentlichen für das GSM–Funknetz verantwortlich (siehe Grafik), während "SMSS~~”~~ das Vermittlungsnetz darstellt und "OMSS~~”~~ für den Betrieb und die Wartung zuständig ist.		Das "BSS" ist im Wesentlichen für das GSM–Funknetz verantwortlich (siehe Grafik), während "SMSS" das Vermittlungsnetz darstellt und "OMSS" für den Betrieb und die Wartung zuständig ist.

	Bei den Fragen zu dieser Aufgabe werden weiterhin folgende Begriffe verwendet:		Bei den Fragen zu dieser Aufgabe werden weiterhin folgende Begriffe verwendet: