Examples of Communication Systems/UMTS Network Architecture - Revision history

Guenter at 17:13, 25 March 2023

2023-03-25T17:13:19Z

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-[[File:EN_Bei_T_4_2_S7b_87.png|left|frame|Excerpt from the ISO/OSI layer model '''KORREKTUR: Radio Resource Control''']]
+[[File:EN_Bei_T_4_2_S7b_88.png|left|frame|Excerpt from the ISO/OSI layer model]]
 <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
 The lower&nbsp; (left)&nbsp; graphic is intended to give an overall view of the structure of the three lowest layers of the ISO/OSI model and to convey the interactions of the different channel types.

@@ Line 232: / Line 232: @@
 *'''&raquo;Picocells&laquo;'''&nbsp; serve only very small areas about&nbsp; $100$&nbsp; meters in diameter,&nbsp; but very high data volumes.
-#&nbsp;They are used in high density locations such as airports,#&nbsp; stadiums,#&nbsp; ... '''KORREKTUR: #?'''
+#&nbsp;They are used in high density locations such as airports,&nbsp; stadiums,&nbsp; and so on.
 #&nbsp;Data rates up to&nbsp; $2\ \rm Mbit/s$&nbsp; are theoretically allowed.
 <br clear=all>

@@ Line 23: / Line 23: @@
 ==Domains and interfaces ==
 <br>
-The units of the UMTS network listed on the last page '''KORREKTUR: in the last section''' are grouped into so-called&nbsp; '''&raquo;domains&laquo;'''.&nbsp; This refers to functional blocks that serve to standardize and study the functional units and interfaces within the UMTS network.
+The units of the UMTS network listed  in the last section are grouped into so-called&nbsp; '''&raquo;domains&laquo;'''.&nbsp; This refers to functional blocks that serve to standardize and study the functional units and interfaces within the UMTS network.
 [[File:EN_Bei_T_4_2_S2_v1.png|right|frame|Basic units of the UMTS system architecture]]
@@ Line 194: / Line 194: @@
 ==Communication within the ISO/OSI layer model==
 <br>
-Communication between the different layers of the ISO/OSI model is ensured by the logical, physical and transport channels presented on the last pages '''KORREKTUR: in the last sections'''.
+Communication between the different layers of the ISO/OSI model is ensured by the logical, physical and transport channels presented in the last sections.
 [[File:EN_Bei_T_4_2_S7a_87.png|right|frame|Physical,&nbsp; logical and transport channels in UMTS]]

@@ Line 358: / Line 358: @@
-However,&nbsp; crucial&nbsp; '''disadvantages'''&nbsp; of this architecture&nbsp; $($ at 2011$)$&nbsp; include:
+However,&nbsp; crucial&nbsp; '''disadvantages'''&nbsp; of this architecture&nbsp; $($ in 2011$)$&nbsp; include:
 #The cumbersome integration of second generation cellular infrastructure,
 #the need for transition nodes to convert the data in so-called gateways,&nbsp; and

@@ Line 352: / Line 352: @@
 Major&nbsp; '''advantages'''&nbsp; of IP networks are:
-#A forward-looking alternative to the previou design,
+#A forward-looking alternative to the previous design,
 #a low-cost routing technology &nbsp; ⇒ &nbsp; large savings in switching equipment,
 #great flexibility in the introduction of new services,&nbsp; and

@@ Line 147: / Line 147: @@
 :*&nbsp;'''&raquo;Traffic Channels&laquo;''' $($ending with&nbsp; "TCH"$)$:
 :#Subscriber information is exchanged over the traffic channels.
-:#While the&nbsp; "DTCH"&nbsp; can be assigned individually to a mobile subscriber for user data transport,&nbsp; a&nbsp;  "CTCH"&nbsp&nbsp; is predominantly assigned to all or to a predefined subscriber group.
+:#While the&nbsp; "DTCH"&nbsp; can be assigned individually to a mobile subscriber for user data transport,&nbsp; a&nbsp;  "CTCH"&nbsp;&nbsp; is predominantly assigned to all or to a predefined subscriber group.
 <br clear=all>
 == Transport channels  ==