GSM Cellular System

Question 1

Describe the frequency band for PGSM

Answer 1

Uplink - 890 to 915 MHz
Downlink- 935 to 960 MHz

Duplex spacing - 45 MHz

Carrier Spacing - 200 MHz and 124 carriers

Question 2

Explain EGSM

Answer 2

Extension of 10 MHz at the end of both sub blocks.

An extra 50 carriers, 174

Question 3

What is GSM 1800 also known as?

Answer 3

Digital Communications Service

Question 4

What is the digital network used in the USA?

Answer 4

GSM 1900 or Personal Communications Service

Question 5

What is a channel number also known as?

Answer 5

An Absolute Radio Frequency Channel Number

Question 6

How many users can one frequency support?

Answer 6

8

Question 7

What is Frequency Re-use?

Answer 7

Increasing the capacity of a cellular network through re using the frequency in a different area for a different transmission.

Question 8

Name and describe the GSM Cell types

Answer 8

Umbrella - Largest, variety of smaller cell types
Macro Cell - Rural areas or along highways
Micro Cell - Mall, hotels or transport hub
Pico Cell - Small area, offices, shopping malls
Femto - Residential or small business, connects via broadband

Question 9

What is a Femto Cell originally known as?

Answer 9

Access Point Base Station

Question 10

Describe Cell Sectorisation

Answer 10

Designed to give a tailored coverage to a specific area whilst maintaining a constant coverage to a whole area. It optimises frequency reuse and at a minimum triples network capacity.