Mobile Phones

Question 1

What time of access does 2G uses?

Answer 1

1. FDMA
2. TDMA
3. CDMA

Question 2

What access does 3G uses?

Answer 2

1. CDMA-2000
2. WCDMA
3. TDSCMA

Question 3

What access does 3.5G uses?

Answer 3

HSDPA - High speed Downlink Packet Access

Question 4

What access does 4G uses?

Answer 4

LTE - Long term evolution

Question 5

How does radio transmission works?

Answer 5

perform either AM/FM modulation at input and then demodulation at output.

Question 6

What is half duplex Radio Communication

Answer 6

1. Use single frequency for transmission

3. Only 1 user can talk at a time

Question 7

What is Full duplex Radio Communication

Answer 7

1. 2 way frequency transmission

2. both can talk at the same time

Question 8

How does Data Network get transmitted?

Answer 8

1. City is divided into many small cells.
2. Each cell has a base station.
3. Frequency will be bump across cells to reach targeted area
4. Controlled by MSC - Mobile Switching Centre

Question 9

What is frequency reuse?

Answer 9

Assigning same radio frequency to non-adjacent cell.

Question 10

Explain the advantages of frequency reuse

Answer 10

WIth this method, users can be x10 bc of the shared bandwidth

Question 11

What is mobile phone channels?

Answer 11

Full duplex communication mode whereby both users can talk at the same time

Question 12

What is cell to cell handover?

Answer 12

It’s when a signal leaves a certain cell and into a new cell, the signal is picked up by the new cell region

Question 13

How is cell to cell handover?

Answer 13

Thru Mobile Switching Centre

Question 14

What is Data Roaming?

Answer 14

The ability to use mobile network outside of your own country.

Question 15

How does data roaming work?

Answer 15

1. Signal is detected by visited network.
2. verify for access right.
3. Once granted, will create temp subscriber record and take over the signal.

Question 16

How Many mobile phone code are there?

Answer 16

1. ESN - electronic serial number (32Bit)
2. MIN - mobile identification number (10D)
3. SID - system identification code (5D)
4. IMEI - International mobile equipment identity (15D)

Question 17

What is SIM?

Answer 17

aka Subscriber Identity Module

store IMSI and contact info

Question 18

How many channel access methods are there?

Answer 18

1. FDMA
2. TDMA
3. CDMA

Question 19

What is FDMA?

Answer 19

Frequency Division Multiple Access that assign frequency to a call.

Question 20

What is TDMA

Answer 20

Time division multiple access that assign a short time to multiple calls.

Question 21

What is CDMA

Answer 21

Code Division Multiple Access where a random pseudocode is assign to a call.

Question 22

Why is CDMA good?

Answer 22

Because of the random pseudocode assigned, hackers cannot eavesdrop nor locate/ hack the call. thus improving its security

Question 23

What communication access does the 3G mobile uses?

Answer 23

CMDA-2000
WCDMA
TDSCMA

Question 24

What is PDA?

Answer 24

Personal Digital Assistant. Electronic planner that helps to organize daily shecdule.

Question 25

What does PDA do?

Answer 25

Performs PIM

Personal Information Management

Question 26

What does PDA include of?

Answer 26

LED / LCD screen
built in qwerty keyboard
support stylus pen and touchscreen

Question 27

What OS does the PDA run on?

Answer 27

1. Microsoft mobile OS
2. Palm OS
3. Blackberry OS
4. Linux OS
5. Symbian OS