Mobile Communications/Characteristics of UMTS - Revision history

Guenter at 16:44, 20 February 2023

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Hwang at 15:48, 26 January 2023

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Hwang at 15:44, 26 January 2023

2023-01-26T15:44:08Z

@@ Line 70: / Line 70: @@
 &rArr; &nbsp; The&nbsp; "Core Network"&nbsp; $\rm (CN)$&nbsp; takes over the switching of the data within the UMTS network.&nbsp; For this purpose, it contains the following hardware and software components at &nbsp;"circuit-switching"&nbsp;:
-[[File:EN_Mob_T_3_4_S3.png|right|frame|UMTS access level&nbsp; $($with&nbsp; "circuit-switching"$)$ ''': KORREKTUR'''|class=fit]]
+[[File:EN_Mob_T_3_4_S3_v2.png|right|frame|UMTS access level&nbsp; $($with&nbsp; "circuit-switching"$)$|class=fit]]
 :*The &nbsp;"Mobile Switching Center"&nbsp; $\rm (MSC)$&nbsp; is responsible for localization and authentication, routing of calls, handover and encryption of user data.<br>

@@ Line 69: / Line 69: @@
 :*The &nbsp;"Radio Network Controller"&nbsp; $\rm (RNC)$&nbsp; is responsible for controlling the base stations.&nbsp; It is also responsible within the cells for call acceptance control, encryption and decryption, conversion to ATM ("Asynchronous Tranfer Mode"), channel assignment, handover and power control.<br><br>
-&rArr; &nbsp; The&nbsp; "Core Network"&nbsp; $\rm (CN)$&nbsp; takes over the switching of the data within the UMTS network.&nbsp; For this purpose, it contains the following hardware and software components at &nbsp;"Circuit Switching"&nbsp;:
+&rArr; &nbsp; The&nbsp; "Core Network"&nbsp; $\rm (CN)$&nbsp; takes over the switching of the data within the UMTS network.&nbsp; For this purpose, it contains the following hardware and software components at &nbsp;"circuit-switching"&nbsp;:
-[[File:EN_Mob_T_3_4_S3.png|right|frame|UMTS access level (with "Circuit Switching") ''': KORREKTUR'''|class=fit]]
+[[File:EN_Mob_T_3_4_S3.png|right|frame|UMTS access level&nbsp; $($with&nbsp; "circuit-switching"$)$ ''': KORREKTUR'''|class=fit]]
 :*The &nbsp;"Mobile Switching Center"&nbsp; $\rm (MSC)$&nbsp; is responsible for localization and authentication, routing of calls, handover and encryption of user data.<br>

@@ Line 172: / Line 172: @@
 *The quadrature component is weighted with the square root of the power ratio&nbsp; $G$&nbsp; between&nbsp; $I$&nbsp; and&nbsp; $Q$&nbsp; to compensate power differences.&nbsp; Then the sum signal&nbsp; $(I + {\rm j} \cdot Q)$&nbsp; is multiplied by a complex scrambling code.<br>
-*Finally the pulse shaping is done with&nbsp; $g_s(t)$&nbsp; corresponding to the&nbsp; [[Digital_Signal_Transmission/Optimierung_der_Basisband%C3%BCbertragungssysteme#Wurzel.E2.80.93Nyquist.E2.80.93Systeme| $\text{Root Raised Cosine}$]].&nbsp; Since the reception '''KORREKTUR: receiver''' filter is adapted to&nbsp; $G_s(f)$&nbsp; the overall frequency response thus fulfills the&nbsp; [[Digital_Signal_Transmission/Eigenschaften_von_Nyquistsystemen#Erstes_Nyquistkriterium_im_Frequenzbereich| $\text{first Nyquist criterion}$]].<br><br>
+*Finally the pulse shaping is done with&nbsp; $g_s(t)$&nbsp; corresponding to the&nbsp; [[Digital_Signal_Transmission/Optimierung_der_Basisband%C3%BCbertragungssysteme#Wurzel.E2.80.93Nyquist.E2.80.93Systeme| $\text{Root Raised Cosine}$]].&nbsp; Since the receiver filter is adapted to&nbsp; $G_s(f)$&nbsp; the overall frequency response thus fulfills the&nbsp; [[Digital_Signal_Transmission/Eigenschaften_von_Nyquistsystemen#Erstes_Nyquistkriterium_im_Frequenzbereich| $\text{first Nyquist criterion}$]].<br><br>
 Further information on this topic can be found in the section&nbsp; [[Examples_of_Communication_Systems/Telecommunications_Aspects_of_UMTS#Frequency_responses_and_pulse_shaping_for_UMTS|

@@ Line 70: / Line 70: @@
 &rArr; &nbsp; The&nbsp; "Core Network"&nbsp; $\rm (CN)$&nbsp; takes over the switching of the data within the UMTS network.&nbsp; For this purpose, it contains the following hardware and software components at &nbsp;"Circuit Switching"&nbsp;:
-[[File:EN_Mob_T_3_4_S3.png|right|frame|UMTS access level (with "Circuit Switching") '''KORREKTUR: Netz, Fremdnetz'''|class=fit]]
+[[File:EN_Mob_T_3_4_S3.png|right|frame|UMTS access level (with "Circuit Switching") ''': KORREKTUR'''|class=fit]]
 :*The &nbsp;"Mobile Switching Center"&nbsp; $\rm (MSC)$&nbsp; is responsible for localization and authentication, routing of calls, handover and encryption of user data.<br>
@@ Line 87: / Line 87: @@
 == CDMA - Multiple access with UMTS ==
 <br>
-UMTS uses the multiple access method&nbsp; [[Modulation_Methods/Direct-Sequence_Spread_Spectrum_Modulation#Block_diagram_and_equivalent_low-pass_model| $\text{Direct Sequence Code Division Multiple Access}$]]&nbsp; $\rm (DS&ndash;CDMA)$.&nbsp; The procedure '''KORREKTUR: method?''' is sometimes called&nbsp; "PN&ndash;Modulation".<br>
+UMTS uses the multiple access method&nbsp; [[Modulation_Methods/Direct-Sequence_Spread_Spectrum_Modulation#Block_diagram_and_equivalent_low-pass_model| $\text{Direct Sequence Code Division Multiple Access}$]]&nbsp; $\rm (DS&ndash;CDMA)$.&nbsp; The method is sometimes called&nbsp; "PN&ndash;Modulation".<br>
 [[File:EN Mob T 3 4 S4.png|right|frame|Principle and signal characteristics with "DS-CDMA" for two users|class=fit]]

@@ Line 70: / Line 70: @@
 &rArr; &nbsp; The&nbsp; "Core Network"&nbsp; $\rm (CN)$&nbsp; takes over the switching of the data within the UMTS network.&nbsp; For this purpose, it contains the following hardware and software components at &nbsp;"Circuit Switching"&nbsp;:
-[[File:P ID2209 Mob T 3 4 S3 v1.png|right|frame|UMTS access level (with "Circuit Switching") '''KORREKTUR: Netz, Fremdnetz'''|class=fit]]
+[[File:EN_Mob_T_3_4_S3.png|right|frame|UMTS access level (with "Circuit Switching") '''KORREKTUR: Netz, Fremdnetz'''|class=fit]]
 :*The &nbsp;"Mobile Switching Center"&nbsp; $\rm (MSC)$&nbsp; is responsible for localization and authentication, routing of calls, handover and encryption of user data.<br>
@@ Line 150: / Line 150: @@
 <br clear =all>
-[[File:EN_Mob_T_3_4_S5b.png|left|frame|Some examples and properties of suitable spreading and scrambling codes|class=fit]]
+[[File:EN_Mob_T_3_4_S5b_v3.png|left|frame|Some examples and properties of suitable spreading and scrambling codes|class=fit]]
 <br><br><br>
 *In the uplink, each mobile station has its own scrambling code and the separation of the individual channels is done using the same code.

@@ Line 10: / Line 10: @@
 The main motivation for the development of&nbsp; &raquo;'''third generation mobile radio systems'''&laquo; &nbsp; was the realization that 2G systems could not satisfy the bandwidth requirements for the use of multimedia services.
-[[File:EN_Mob_T_3_4_S1.png|right|frame|Development of the mobile radio systems '''KORREKTUR: Datenrate'''|class=fit]]
+[[File:EN_Bei_T_4_1_S1.png|right|frame|Development of the mobile radio systems|class=fit]]
 The graph shows the development of mobile radio systems from 1995 to 2006 in terms of performance.&nbsp; The specified data rates were still realistic for 2011 with no more than two active users in one cell.&nbsp; The maximum values often stated by providers were mostly not reached in practice.

@@ Line 79: / Line 79: @@
 The graphic shows the UMTS architecture for circuit switching, where the Core Network&nbsp; $\rm (CN)$&nbsp; is organized similarly to the GSM architecture.
-The&nbsp; [[Examples_of_Communication_Systems/UMTS%E2%80%93Netzarchitektur#Architektur_der_Zugangsebene| $\text{system architecture for packet switching}$]]&nbsp; differs fundamentally in the following points:
+The&nbsp; [[Examples_of_Communication_Systems/UMTS_Network_Architecture#Access_level_architecture| $\text{system architecture for packet switching}$]]&nbsp; differs fundamentally in the following points:
 *Here, the communication partners do not use the channel assigned to them exclusively, but the packets are mixed with those of other users.