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Mobile Networks 3 - (AL_KCENI_8_3) 15974

Mobile Networks 3 - (AL_KCENI_8_3) 15974

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What is FDMA?

Fixed Dual Main Antenna

Frequencys Divided for More Application

Modulation system that is used in GSM

This is where the 124 frequencies that are available in GSM 900 are assigned to different mobile phones.

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What is comfort noise?

It’s the background noise that is transmitted to the receivers mobile when DTX is activated in the senders mobile.

its the background music you hear while waiting to speak to an operator

its that sound that is heard when a phone is powered up

its the interference that can sometimes be heard on a phone

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What is an omnidirectional cell?

It’s a cell where the antenna is located in the centre of the cell and power is transmitted equally in every direction

It's a cell where all the antennas are pointing in the onr direction

It's a cell that overlays several smaller and is used for fast moving traffic

It's a cell connected to another cell by a microwave point to point link

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Identify the unit that determines if someone is speaking?

the impulse sonic speech unit

the speech codec

Voice Activity Detector (VAD)

the speech detector

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Outline the function of the BTS?

The BTS supplies radio channels (frequencies/Time slots) to the radio cell

Authenticates each mobile on the network

Registers fault alarms

Collects Billing information

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How many cells are in a location area?

Depends on what the network operator wants

Depends on the number of subscribers in a particular area.

No greater than 20

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Explain what is meant by duplex frequencies?

The internal clock frequence of the mobile phone

Duplex frequencies are the frequency pairs (uplink freq and downlink freq) used for two way conversation in a mobile phone.

The block of frequencies that have been allocated to the GSM standard

The frequencies that are specified in the licence

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DTX Discontinuous Transmission (DTX) is used (choose 2)

to reduce the level of interference with neighbouring cells.

to reduce co channel interference

fill in coverage holes in the network

to improve to range of a base stations signal

to reduce the battery drain

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A location area is

A location area is a grouping of cells used to manage the tracking of mobile stations.

an area that the networks hardware is located in

is an area that you are most likely to find phones operating in

is a management tool to group similar customers together

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UMTS Uses the following methods to control power

Closed Loop Power Control

Power control over the ethernet

Outer Loop Power Control

Open Loop Power Control

Power Control with feedback

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