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MOBLIE PHONE NETWORKS Dr. Hassan Nojumi Functions of Mobile Phones Functions of Mobile Phones Send/Receive Voice Message Functions of Mobile Phones Send/Receive Voice Message Send/Receive E-Mail Functions of Mobile Phones Send/Receive Voice Messages Send/Receive E-Mail

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moblie phone networks dr hassan nojumi

MOBLIE PHONE NETWORKSDr. Hassan Nojumi

Mobile Phone Networks Dr. Hassan Nojumi

functions of mobile phones
Functions of Mobile Phones

Mobile Phone Networks Dr. Hassan Nojumi

functions of mobile phones3
Functions of Mobile Phones
  • Send/Receive Voice Message

Mobile Phone Networks Dr. Hassan Nojumi

functions of mobile phones4
Functions of Mobile Phones
  • Send/Receive Voice Message
  • Send/Receive E-Mail

Mobile Phone Networks Dr. Hassan Nojumi

functions of mobile phones5
Functions of Mobile Phones
  • Send/Receive Voice Messages
  • Send/Receive E-Mail
  • Internet Connection

Mobile Phone Networks Dr. Hassan Nojumi

functions of mobile phones6
Functions of Mobile Phones
  • Send/Receive Voice Messages
  • Send/Receive E-Mail
  • Internet Connection
  • Complementing PDAs, GPS Receivers, etc.

Mobile Phone Networks Dr. Hassan Nojumi

functionality
Functionality

Combination of

. . .

And

. . .

Mobile Phone Networks Dr. Hassan Nojumi

functionality8
Functionality

Combination of

Telephone Technology

And

. . .

Mobile Phone Networks Dr. Hassan Nojumi

functionality9
Functionality

Combination of

Telephone Technology

And

Wireless Communication

Mobile Phone Networks Dr. Hassan Nojumi

basic notion
Basic Notion

Geographical Division into

Cells

Mobile Phone Networks Dr. Hassan Nojumi

basic notion11
Basic Notion

Geographical Division into

Cells

Result:

Possibility of simultaneous use of frequency bands by users

Mobile Phone Networks Dr. Hassan Nojumi

basic technology
Basic Technology

Each Cell

  • About 10 square miles About 26 square kilometers

Mobile Phone Networks Dr. Hassan Nojumi

basic technology13
Basic Technology

Each Cell

  • About 10 square miles About 26 square kilometers
  • With a Base Station with transmission equipment and antenna

Mobile Phone Networks Dr. Hassan Nojumi

basic technology14
Basic Technology
  • Communication can be made using the same frequencies in different cells.

Mobile Phone Networks Dr. Hassan Nojumi

basic technology15
Basic Technology
  • Communication can be made using the same frequencies in different cells.
  • Several service providers may use one Tower.

Mobile Phone Networks Dr. Hassan Nojumi

basic notion cellular
Basic Notion: Cellular

Mobile Phone Networks Dr. Hassan Nojumi

communication channels
Communication Channels

Simplex: One-Way

Transmitter

Receiver

Mobile Phone Networks Dr. Hassan Nojumi

communication channels18
Communication Channels

Half-Duplex: Two-Way

One at a time

Transmitter

Receiver

Receiver

Transmitter

Mobile Phone Networks Dr. Hassan Nojumi

communication channels19
Communication Channels

Full-Duplex: Two-Way

Simultaneously

Transmitter

Receiver

Receiver

Transmitter

Mobile Phone Networks Dr. Hassan Nojumi

communication channels20
Communication Channels

Full-Duplex: Two-Way

Simultaneously

Mobile Phone Networks Dr. Hassan Nojumi

communication channels21
Communication Channels

Each cell

  • About 56 Voice Channels (Full-Duplex)

Mobile Phone Networks Dr. Hassan Nojumi

communication channels22
Communication Channels

Each cell

  • About 56 Voice Channels (Full-Duplex)
  • Several Control Channels

Mobile Phone Networks Dr. Hassan Nojumi

communication channels23
Communication Channels

Each cell

  • About 56 Voice Channels (Full-Duplex)
  • Several Control Channels
  • Three-fold increase possible by TDMA

Mobile Phone Networks Dr. Hassan Nojumi

analog versus digital
Analog Versus Digital

Digital signals can be manipulated, compressed, etc., more easily.

Mobile Phone Networks Dr. Hassan Nojumi

analog versus digital25
Analog Versus Digital

Digital signals can be manipulated, compressed, etc., more easily.

FSK (Frequency Shift Keying) for Tower/Phone Connection

Mobile Phone Networks Dr. Hassan Nojumi

access technologies
Access Technologies

Mobile Phone Networks Dr. Hassan Nojumi

access technologies27
Access Technologies

FDMA

Frequency Division

Multiple Access

Mobile Phone Networks Dr. Hassan Nojumi

access technologies28
Access Technologies

FDMA

Frequency Division

Multiple Access

Available frequency band is divided and each part assigned separately.

Mobile Phone Networks Dr. Hassan Nojumi

access technologies29
Access Technologies

FDMA

Mobile Phone Networks Dr. Hassan Nojumi

access technologies30
Access Technologies

FDMA

  • Traditional radio transmission

Mobile Phone Networks Dr. Hassan Nojumi

access technologies31
Access Technologies

FDMA

  • Traditional radio transmission
  • Not efficient for digital transmission

Mobile Phone Networks Dr. Hassan Nojumi

access technologies32
Access Technologies

TDMA

Time Division

Multiple Access

Mobile Phone Networks Dr. Hassan Nojumi

access technologies33
Access Technologies

TDMA

Time Division

Multiple Access

Available time is divided and each part assigned separately.

Mobile Phone Networks Dr. Hassan Nojumi

access technologies34
Access Technologies

TDMA

Mobile Phone Networks Dr. Hassan Nojumi

access technologies35
Access Technologies

TDMA

Suitable for digital transmission as compression techniques can greatly reduce needed transmission time.

Mobile Phone Networks Dr. Hassan Nojumi

access technologies36
Access Technologies

TDMA

  • “Multiprogramming” idea

Mobile Phone Networks Dr. Hassan Nojumi

access technologies37
Access Technologies

TDMA

  • “Multiprogramming” idea
  • Has typically three times the capacity of an analog system

Mobile Phone Networks Dr. Hassan Nojumi

access technologies38
Access Technologies

TDMA

  • IS- 54: 800 MHz Band

Mobile Phone Networks Dr. Hassan Nojumi

access technologies39
Access Technologies

TDMA

  • IS- 54: 800 MHz Band
  • IS-136: 1900 MHz Band

Mobile Phone Networks Dr. Hassan Nojumi

access technologies40
Access Technologies

TDMA

  • IS- 54: 800 MHz Band
  • IS-136: 1900 MHz Band
  • Dual-Band phones can operate in both bands.

Mobile Phone Networks Dr. Hassan Nojumi

access technologies41
Access Technologies

TDMA/GSM

Global System for

Mobile Communications

Specialized TDMA used for mobile phone communication

Mobile Phone Networks Dr. Hassan Nojumi

access technologies42
Access Technologies

TDMA/GSM

Encryption methods are used to make the call more secure.

Mobile Phone Networks Dr. Hassan Nojumi

access technologies43
Access Technologies

TDMA/GSM

To Connect to different service providers, users change their

SIM(Subscriber Identification Module) Cards that contain necessary data for connection

Mobile Phone Networks Dr. Hassan Nojumi

access technologies44
Access Technologies

CDMA

Code Division

Multiple Access

Mobile Phone Networks Dr. Hassan Nojumi

access technologies45
Access Technologies

CDMA

Code Division

Multiple Access

Communication data is digitized and distributed

over the available band.

Mobile Phone Networks Dr. Hassan Nojumi

access technologies46
Access Technologies

CDMA

Code Division

Multiple Access

Each call is assigned a Sequence Code. Calls are

overlaid over available band.

Mobile Phone Networks Dr. Hassan Nojumi

access technologies47
Access Technologies

CDMA

Mobile Phone Networks Dr. Hassan Nojumi

communication cells
Communication Cells
  • Each cell About 26 Km

2

Mobile Phone Networks Dr. Hassan Nojumi

communication cells49
Communication Cells
  • Each cell About 26 Km
  • Many Base Stations and Transmission Towers required for a large city (paid off by many customers)

2

Mobile Phone Networks Dr. Hassan Nojumi

communication cells50
Communication Cells

All Base Stations in a region are controlled by an MTSO (Mobile Telephone Switching Office)

Mobile Phone Networks Dr. Hassan Nojumi

cell phone codes
Cell Phone Codes

ESN

Electronic Serial Number

Unique 32-bit number programmed into the phone at manufacture

- Permanent and Unchangeable -

Mobile Phone Networks Dr. Hassan Nojumi

cell phone codes52
Cell Phone Codes

MIN

Mobile Identification Number

10-digit number derived from

mobile phone number

- Assigned When Phone Activated -

Mobile Phone Networks Dr. Hassan Nojumi

cell phone codes53
Cell Phone Codes

SID

System Identification Number

5-Digit Carrier Code

- Assigned When Phone Activated -

Mobile Phone Networks Dr. Hassan Nojumi

cell phone codes54
Cell Phone Codes

Each phone user has a unique MIN&ESN identification, used by the phone company for billing.

Mobile Phone Networks Dr. Hassan Nojumi

cell phone codes55
Cell Phone Codes

MIN&ESN identification may be captured by scanning the call and used by a third party for making fraudulent calls.

Mobile Phone Networks Dr. Hassan Nojumi

cell phone communication
Cell Phone Communication

Startup

Mobile Phone Networks Dr. Hassan Nojumi

cell phone communication57
Cell Phone Communication

Startup

  • Phone turned on.

Mobile Phone Networks Dr. Hassan Nojumi

cell phone communication58
Cell Phone Communication

Startup

  • Phone turned on.
  • Device sends Registration Request to MTSO

Mobile Phone Networks Dr. Hassan Nojumi

cell phone communication59
Cell Phone Communication

Startup

  • Phone turned on.
  • Device sends Registration Request to MTSO
  • An SID is looked for on a Control Channel.

Mobile Phone Networks Dr. Hassan Nojumi

cell phone communication60
Cell Phone Communication

Startup

If SID not found, Out of Range.

Mobile Phone Networks Dr. Hassan Nojumi

cell phone communication61
Cell Phone Communication

Startup

If SID not found, Out of Range.

If SID found, comparison is made with the programmed SID in the phone device

Mobile Phone Networks Dr. Hassan Nojumi

cell phone communication62
Cell Phone Communication

Startup

If SID not found, Out of Range.

If SID found, comparison is made with the programmed SID in the phone device

Matched SID Means Home

Mobile Phone Networks Dr. Hassan Nojumi

cell phone communication63
Cell Phone Communication

Startup

If SID Not matched, MTSO contacts the Home MTSO to verify that SID in the phone device is valid.

Mobile Phone Networks Dr. Hassan Nojumi

cell phone communication64
Cell Phone Communication

Connection

Destination is dialed.

Mobile Phone Networks Dr. Hassan Nojumi

cell phone communication65
Cell Phone Communication

Connection

Destination is dialed.

MTSO selects and assigns a frequency channel for call

Mobile Phone Networks Dr. Hassan Nojumi

cell phone communication66
Cell Phone Communication

Connection

Cell Change is done by coordination between cells and MTSO using signal strengths.

Mobile Phone Networks Dr. Hassan Nojumi

basic notion cellular67
Basic Notion: Cellular

Mobile Phone Networks Dr. Hassan Nojumi

other cellular phone details
Other Cellular Phone Details:

Mobile Phone Networks Dr. Hassan Nojumi

other cellular phone details69
Other Cellular Phone Details:
  • Hardware/Software

Mobile Phone Networks Dr. Hassan Nojumi

other cellular phone details70
Other Cellular Phone Details:
  • Hardware/Software
  • Analog-to-Digital Conversion

Mobile Phone Networks Dr. Hassan Nojumi

other cellular phone details71
Other Cellular Phone Details:
  • Hardware/Software
  • Analog-to-Digital Conversion
  • Digital-to-Analog Conversion

Mobile Phone Networks Dr. Hassan Nojumi

other cellular phone details72
Other Cellular Phone Details:
  • Hardware/Software
  • Analog-to-Digital Conversion
  • Digital-to-Analog Conversion
  • Display

Mobile Phone Networks Dr. Hassan Nojumi

other cellular phone details73
Other Cellular Phone Details:
  • Hardware/Software
  • Analog-to-Digital Conversion
  • Digital-to-Analog Conversion
  • Display
  • Power/Batteries

Mobile Phone Networks Dr. Hassan Nojumi

other cellular phone details74
Other Cellular Phone Details:
  • Cell Phone Etiquette

Mobile Phone Networks Dr. Hassan Nojumi