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Goose > Gsm Architecture > Flashcards

Gsm Architecture Flashcards

1
Q

Expand GSM

A

Global system for mobile communications

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2
Q

What is the gsm mobile phone know as ?

A

Mobile station or ms

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3
Q

What two elements does a mobile station (MS) have ?

A

The mobile equipment (ME)

Subscriber Identity Module (SIM)

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4
Q

What is the air interface ?

A

It is the radio frequency link between the mobile station and the tower

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5
Q

What information can a sim contain ?

A 
Phone book 
Imsi 
Tmsi 
Authentication and encryption keys 
Services available 
Msisdn
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6
Q

Expand MSISDN

A

Mobile station interested services digital network number

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7
Q

Expand IMSI

A

International mobile subscriber identification

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8
Q

Expand TMSI

A

Temporary mobile subscriber identification

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9
Q

Expand IMEI

A

International mobile equipment identification

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10
Q

What is the msisdn ?

A

Mobile stations phone number

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11
Q

How many digits is the msisdn made up of ?

A

A maximum of 15 digits

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12
Q

How is a msisdn broken down ?

A

First 2 digits = country code

Next 3 digits = the national destination code

Remaining digits = unique serial number

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13
Q

Expand NDC

A

National destination code

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14
Q

Expand PLMN

A

Public land mobile network

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15
Q

What is the national destination code identifying?

A

Which public land mobile network the ms is associated with

O2 or EE

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16
Q

Expand SNR

A

Unique serial number

17
Q

How is a international mobile subscriber identity broken down ?

A

First 3 digits = mobile country code

Next 2 digits = mobile network code

Remaining digits = operator specific

18
Q

Expand MCC

A

Mobile country code

19
Q

Expand MNC

A

Mobile network code

20
Q

What identity is the most commonly sent between the MS and the network

A

True tmsi or temporary Mobile subscriber identity

21
Q

How is a tmsi generated ?

A

It is a randomly allocated hexadecimal number that is given to the ms after initial authentication

22
Q

Why effects the tmsi ? When is it updated?

A

Each time the mobile moves to a new geographical area

23
Q

How can the network use a tmsi

A

As a security feature, to ensure the subscribers identity remains secure and is not tracked while accessing the network

24
Q

Where is international mobile subscriber or imsi held ?

A

On the SIM card

25
Q

What is associated with the imsi

A

All subscriber related information like billing

26
Q

Expand imei

A

International mobile equipment identity

27
Q

What could a imei also be known as ?

A

Eir or equipment identity register

28
Q

How is a imei broken down ?

A

First 8 digits = type allocation code (tac).

Next 6 digits = serial number

Last digit = check digit

29
Q

How is the type allocation (tac) broken down ?

A

First 2 digits = reporting body identifier

Next 6 = mobile equipment type identifier

30
Q

Expand SNR and what is it used for ?

A

Serial number

Used to uniquely identify each individual mobile equipment

31
Q

What is the purpose of a check digit

A

To help guard against incorrect entries into the equipment identity register

32
Q

When is the imei broadcast ?

A

Powering on the mobile station

Change of SIM card

33
Q

Expand BTS

A

Base transceiver station

34
Q

What role does the Bts play ?

What will it typically have ?

A

It is responsible for the radio functions associated with connection to and from the ms

Several transceivers

35
Q

What is bts commonly referred to as ?

A

Mobile phone Mast

36
Q

What functions does a bts provide ?

A 
Radio frequency carriers 
Modulation and demodulation of rf carriers 
Data processing 
Error coding 
Ciphering 
Channel mapping
37
Q

What is the link between the mobile station and base transceiver station know as ?

A

Um or air interface and is an encrypted radio frequency link

38
Q

What are the most common antenna types used in gsm ?

A

Macro - range < 35km

Micro - range < 5 km

Pico - around a hundred meters

Micro wave radio relay - link bts to other bts

Goose (10 decks)

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