Training Slides & Notes

1. Cellular Networks
& Infrastructure
A Brief Overview
By
Engr. Abdul Razzaque Memon
MCS (IT/MIS); BE (Electronics) ; PE(PEC) ; BA (Arts)
WEB : http : // www.uldhdqpia.webs.com
E-Mail : uldhdqpia@yahoo.com

2. Cellular Network
Design Issues
By
Engr. Abdul Razzaque Memon
MCS (IT/MIS); BE (Electronics) ; PE(PEC) ; BA (Arts)
WEB : http : // www.uldhdqpia.webs.com
E-Mail : uldhdqpia@yahoo.com
CELLUAR TELEPHONY

3. What is a Cell?
Cellular
Telephony
meets
demand multiple users in a
metropolitan
(called
the
market) by breaking whole
market into several smalle
regions known as CELLS.
Each cell has its own
transmissi tower and set of
assignable communication
channels. A Cell i area
covered by a BASE STATION.
CELLUAR TELEPHONY

4. Figure showing mobile
telephone tower

5. CELLUAR TELEPHONY
Question?
Why hexagon is
us as a cell?
Why not
triangle? a
square a circle?

6. CELLUAR TELEPHONY
Answer – Yes Hexagon
Because to avoid
gaps between cells.
If a customer is near the
boundary of a cell, it
can’t be undertaken by
the cell next to
it,because of the gap
between two cells,
therefore communication
breakdown occurs.
And also to remain equal
distance from a base
station to a mobile user.

7. FREQUENCY REUSE
The same frequency is used by many cell
(separated by a distance).
Spectral efficiency (or capacity) is greatly
increased.
See next slide . . .

13. Cellular Network Architect
Example of 2G Digital Cellular
The Global System for Mobile
communication . . . .

14. Network Architecture

21. (

23. Mobile Station (MS)
The Cellular (GSM) committee has introduce
important powerful innovation by using a S Card
in conjunction with a mobile telephone GSM
subscribers are provided with a Subs Identity
Module card (SIM-Card) with it identification at
the very beginning of the s "Confidential
information -- may not b or disclosed without
permission".
The Mobile Station (MS) includes radio e and
the man machine interface (MMI) that subscriber
needs in order to access the ser provided by the
Cellular (GSM) network.
Mobile Station (MS)

25. Mobile Station (MS)
The mobile station includes provisions fo
communication as well as voice.
Each mobile station has an International
Mobile Equipment Identity (IMEI) th
permanently stored in the mobile unit. U
request, the MS sends this number over
signaling channel to the network.
The IMEI is used to identify mobile units are
reported stolen or operating incorrect

31. GSM Architecture
Year Introduced
1
Access method
T
Channel Bandwidth
2
1
1
Number of duplex
channels
2
Users per channel
8
Speech coding bit rate
1
Data coding bit rate
1
Frame size
4
BS Transmission
Band : 935 – 960
MHZ
MS Transmission
Band : 890 – 915
MHZ
45 MHz
3
4
5
6
7
F1 F2 F1' F2'
Frequency
8