Difference between revisions of "D4-Mobile Systems"

From its-wiki.no
Jump to: navigation, search
Line 3: Line 3:
  
 
<span scaled="60%>[Presentation G. Fettweis, IEEE VTC forum Baltimore], http://www.ieeevtc.org/plenaries/vtc2007fall/28.pdf </span>
 
<span scaled="60%>[Presentation G. Fettweis, IEEE VTC forum Baltimore], http://www.ieeevtc.org/plenaries/vtc2007fall/28.pdf </span>
 +
 +
== ⌘Example of propagation ==
 +
Results for UMTS (''worst case''), with 3 sector antenna
 +
* Range of unloaded cell is 700 m in urban pedestrian
 +
* With loaded cell, assumed increase of noise by 10 dB, max cell radius 390 m
 +
* vehicular with typical range of 3600 m (unloaded) and 1900 m (loaded)
 +
 +
* Next: examples and simulations
 +
 +
 +
== ⌘Oslo simulations, performed for GSM at 1800 MHz ==
 +
{|
 +
[[File:Oslocov25dBm.jpg|400px|Transmission at 25 dBm]]
 +
|
 +
[[File:Oslocov35dBm.jpg|400px|Transmission at 35 dBm]]
 +
|}
 +
 +
[[File:scaleimage.png]]
 +
 +
<span style="color:#000B80">how much does the range decrease when reducing the power by 10 dB?
 +
 +
 +
(Source: Helge Dommarsnes, Telenor Mobil)
 +
 +
 +
== ⌘Difference GSM - UMTS ==
 +
 +
[[File:Q16parameterGSM.png|450px|right|Illustration of Q_16 parameter in GSM]]
 +
 +
* Frequency
 +
* Receiver structure
 +
** GSM sliding window of 16 <math>\fs3 \mu s</math>
 +
** UMTS Rake receiver
 +
 +
Q16ratio:The ratio of the power inside to the power outside a window  of duration 16 <math>\fs3 \mu s</math>. For each IR the window is slid to find the position with highest power inside the window.
 +
 +
 +
(Source:R Rækken, G. Løvnes, Telektronikk)
 +
 +
== ⌘Results of link level simulation ==
 +
[[File:LinkLevelEBN0.png|500px|right]]
 +
 +
Simulations to achieve minimum W-CDMA using given QoS parameter: here voice service
 +
 +
(Source: Eurescom P921, D2)
 +
 +
== ⌘UMTS traffic simulations==
 +
[[File:FDD-results.png]]
 +
 +
(Source:Telenor FoU report 3-99)
 +
 +
 +
 +
== ⌘Cell Breathing effect in UMTS==
 +
[[File:CellBreathing-UMTS.gif|500px]]
 +
 +
View: http://www.eurescom.de/~public-web-deliverables/P900-series/P921/D2/index.html  for "live simulation" and "Cell Ranges for GSM1800 and UMTS Services"
 +
 +
(Source: Eurescom P921, D2)
 +
 +
== ⌘Network planning ==
 +
GSM versus UMTS
 +
* UMTS is interference limited
 +
* GSM is build on frequency reuse in the cells, while UMTS has the same frequency in neighbouring cells
 +
* UMTS range is capacity limited
 +
* UMTS requires simultaneous cell planning and network dimensioning
 +
* handover is network based, the handset announces, network performs the handover
 +
* In UMTS a mobile phone can be connected to two cells at the same time, the handover is then called soft handover. Handover between sectors in of the same antenna are called softer handover
 +
 +
 +
== ⌘Cell cover and macro-diversity areas==
 +
Outcome of Eurescom P921 system level simulations
 +
 +
[[File:CellCoverageUMTS.jpg|450px]]
 +
 +
(Source: Eurescom P921, D2)
 +
 +
== ⌘Smart antennas and MIMO measurements==
 +
{|
 +
[[File:SmartAntennaMeasures1.jpg]]
 +
|
 +
[[File:SmartAntennaMeasures2.jpg]]
 +
|}
  
 
= GSM =
 
= GSM =

Revision as of 09:42, 21 September 2014

Wiki for ITS
ITS wiki WNaS@ITS Master/PhD Courses Master Thesis Research Areas
English-Language-icon.png

⌘ Mobile Communication

FettweisRadioDevelopment-Mobile.png

[Presentation G. Fettweis, IEEE VTC forum Baltimore], http://www.ieeevtc.org/plenaries/vtc2007fall/28.pdf

⌘Example of propagation

Results for UMTS (worst case), with 3 sector antenna

  • Range of unloaded cell is 700 m in urban pedestrian
  • With loaded cell, assumed increase of noise by 10 dB, max cell radius 390 m
  • vehicular with typical range of 3600 m (unloaded) and 1900 m (loaded)
  • Next: examples and simulations


⌘Oslo simulations, performed for GSM at 1800 MHz

Transmission at 25 dBm

Transmission at 35 dBm

Scaleimage.png

how much does the range decrease when reducing the power by 10 dB?


(Source: Helge Dommarsnes, Telenor Mobil)


⌘Difference GSM - UMTS

Illustration of Q_16 parameter in GSM
  • Frequency
  • Receiver structure
    • GSM sliding window of 16
    • UMTS Rake receiver

Q16ratio:The ratio of the power inside to the power outside a window of duration 16 . For each IR the window is slid to find the position with highest power inside the window.


(Source:R Rækken, G. Løvnes, Telektronikk)

⌘Results of link level simulation

LinkLevelEBN0.png

Simulations to achieve minimum W-CDMA using given QoS parameter: here voice service

(Source: Eurescom P921, D2)

⌘UMTS traffic simulations

FDD-results.png

(Source:Telenor FoU report 3-99)


⌘Cell Breathing effect in UMTS

CellBreathing-UMTS.gif

View: http://www.eurescom.de/~public-web-deliverables/P900-series/P921/D2/index.html for "live simulation" and "Cell Ranges for GSM1800 and UMTS Services"

(Source: Eurescom P921, D2)

⌘Network planning

GSM versus UMTS

  • UMTS is interference limited
  • GSM is build on frequency reuse in the cells, while UMTS has the same frequency in neighbouring cells
  • UMTS range is capacity limited
  • UMTS requires simultaneous cell planning and network dimensioning
  • handover is network based, the handset announces, network performs the handover
  • In UMTS a mobile phone can be connected to two cells at the same time, the handover is then called soft handover. Handover between sectors in of the same antenna are called softer handover


⌘Cell cover and macro-diversity areas

Outcome of Eurescom P921 system level simulations

CellCoverageUMTS.jpg

(Source: Eurescom P921, D2)

⌘Smart antennas and MIMO measurements

SmartAntennaMeasures1.jpg

SmartAntennaMeasures2.jpg

GSM

Example GSM: the upload band is from 880-915 Unik/MHz (in Europe), which is 35 Unik/MHz. With a carrier of 200 kHz we have 175 channels, which have to be divided between the various operators.

UMTS specifications

http://www.umtsworld.com/technology/wcdma.htm

Retrieved from "https://its-wiki.no/index.php?title=D4-Mobile_Systems&oldid=21279"