GSM

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An IMEI may be retrieved from any GSM mobile by entering what into the ME?

*#06#

CRH is found on what channel and has what values?

-BCCH -0-7 in 2dBm increments

Name five parameters with correlating values

-CRO = 0-63 in 2dB increments -RxLEV = 0-63 ; 63=47dB, 0=110dB or worse -T3212 = 0-255 ; 6 minute increments -CRH = 0-7 ; 5 second increments -C2 = C1+CRO

Three events that will trigger a location update?

-IMSI attach/detach -LAC change -T3212 expires

Explain Process for Mobile registration

-MS turns on and attempts the register last LAC -MS finds tower and decodes BSIC -AuC does something with triplets and algorithms -MS is granted access after it uses RAND to send back the correct SRES to XRES

The HLR contains what?

-Permanent records of subscriber information -Last reported location

What is stored on the SIM card and in the AuC, but is never transmitted over the air?

-Subscriber encryption keys -Current Cipher -Ki -Last 10 calls -Phone Book

Authentication is always performed during what three events?

-initial registration -mobile originated call -location update

CRO value

-value 0-63 -measured between 0-126 dBm -increments of 2 -makes tower look more attractive to ME

The BCCH is normally found on which timeslot?

0

ARFCN assignment for EGSM 900

0-124/975-1023

What dBm is CRO measured between?

0-126 dBm

CRO value ?

0-63

CRO dB range

0-63 dB

Temporary offset values

0-7 0-60 dBm Increments of 10 7 is infinite value

CRH has what value range and in what increments

0-7 in 2dBm increments

Which timeslot is the SDCCH broadcast on?

1

ARFCN assignment for PGSM 900

1-124

ARFCN range for 900 ?

1-124

ARFCN assignment for GSM 850

128-251

ARFCN range for 850 ?

128-251

How many digits are in an IMEI

15

The IMSI is composed of how many digits?

15

Channel range 512-885 ?

1800 band

Channel range 512-810 ?

1900 band

The bandwidth for a single GSM channel is?

200 kHz

Channel offset for GSM 850

45 MHz

Channel offset for PGSM900

45 MHz

EGSM channel offset

45 MHz

ARFCN assignment for GSM 1900/PCS

512-810

ARFCN range for 1900 ?

512-810

ARFCN assignment for GSM 1800/DCS

512-885

ARFCN range for 1800 ?

512-885

The highest Rx LEV possible is what?

63

Each GSM channel can provide service to a maximum of how many full rate subscribers?

8

TDMA eighth rate

8 users on one time slot used in SDCCH

GSM 1900/PCS channel offset

80 MHz

What is the offset between forward and reverse for GSM 1900?

80 MHz

What is the offset for forward and reverse for GSM 1900?

80 MHz

Channel range 128-251 ?

850 band

Channel range 1-124 ?

900 band

GSM 1800/DCS channel offset

95 MHz

ARFCN range for E900 ?

975-1023

Standalone Dedicated Control Channel (SDCCH)

A dedicated point to point signaling channel

Random Access Channel (RACH)

A request of network resources from the MS

Values of CBQ

A value of 0 or 1

What is a pair of frequencies used for communication between BTS and MS

ARFCN

ARFCN

Absolute Radio Frequency Channel Number

AGCH

Access Grant Channel

Definition of CRO

Applies an offset to the C2 re-selection criteria

Definition of Temporary Offset?

Applies negative offset to C2 for the duration of the penalty time

Definition of a cell

Area covered by a BTS

Authenticates the User by the using the IMSI, creates triplet Kc, RAND, SRES

AuC

AuC

Authentication Center

In GSM which of the following is a list of usable channels transmitted by the BCCH?

BA list

List of 32 reusable ARFCNs transmitted by every BTS panel, varies panel to panel

BA list

What channel is CRH found on?

BCCH

What is the CBA sent over?

BCCH

Controls up to several hundred base stations. Middle man between BTS and MSC

BSC

The GCI does not contain which of the following? LAC CI BSIC MCC

BSIC

Front end of the network, contains BTS and BSC

BSS

Cell phone tower ; transmit(tx) and receive(rx) antennas

BTS

BSC

Base Station Controller

BSS

Base Station Subsystem

BTS

Base Transceiver Station

BCCH

Broadcast Control Channel

BA List definition

Broadcast allocation list

Time-slot 0 is for what channel?

Broadcast channel

The penalty timer is used in the calculation for what?

C2

C2 value equation

C2=C1+CRO-(temporary offset*H)

Definition of Cell Bar Access (CBA)

CBA means no registration attempted and no camping ; the ARFCN is available for TCH only

What is designed to prevent An MS reselecting to a certain cell/ARFCN

CBQ

Identifier for specific sectors of a cell

CI

A dB buffer added to a cell to prevent repeated Re-selection on LAC boundaries

CRH

What are the BCCH parameters?

CRO, CRH

Name five parameters

CRO, CRH, C2, T3212 timer, and RxLEV

BCCH parameters with values and increments

CRO= 0 to 63, increments of 2 CRH= a time buffer the prevent constant LAC changes

The area covered by a single BTS is referred to as a?

Cell

MCC, MNC, LAC, CI together is?

Cell Global Identifier (CGI)

CRH

Cell Re-selection Hysteresis

CRH

Cell Reselection Offset

CBQ

Cell bar Qualifier

CI

Cell identifier

CRO

Cell re selection offset

What is the ARFCN also known as? Two things.

Channel number, or channel

Definition of Cell Bar Qualifier ?

Designed to prevent MS deselecting to a certain cell/ARFCN

Frame definition

Division of a defined length of digital information

Channel range 975-1023 ?

E900 band

Verified IMEI of handset

EIR

EIR

Equipment Identity Register

GSM uses a combination of what access schemes?

FDMA and TDMA

List the multiple access schemes.

FDMA, TDMA, CDMA

True or False : The FCCH is a physical channel

False

True or False : The IMEI is in place of a sensitive identifier?

False

True or False : The MS handles deselection while in traffic?

False

True or False : The Network is informed when a MS performs a cell deselection in the same LAC?

False

True or False : when changing LAC, the MS does not notify the network?

False

True or False, if the neighbor cell is in the same LAC as the serving cell, the MS will re-select the neighbor cell if it's C1 is greater than the C1 of the serving cell for one second?

False

A group of 8 of each timeslot is organized into a ?

Frame

Division of a defined length of digital information ?

Frame

FCH

Frequency Control Channel

An MSC that serves as a gateway to outside networks

G-MSC

What type of modulation does GSM use?

GMSK

When a handset performs a location update due to a LAC change, the subscribers current location information is updated at?

Gaining VLR

G-MSC

Gateway Mobile Switching Center

Definition of Penalty Timer?

Gives duration for which the temporary offset is applied

Database of permanent subscriber information as well as current temporary information?

HLR

GSM network uses what type of system?

Half duplex system

TDMA half-rate

Half of a time slot is yours; 2 users on one timeslot

What is an MSC Internal Handover

Handover between different BSCs in same LAC

What is an Inter BTS handover ?

Handover between different BTS' in the same LAC

What is an MSC external handover?

Handover between different LACs ***Gaining MSC is in charge of handover

What is an Intra BTS Handover?

Handover between sectors on a single tower

HLR

Home Location Register

What are permanent identifiers

IMSI, IMEI

Cell Global Identifier(CGI)

Identifier that uniquely identifies a specific sector from any sector in the world

Cell re-selection is only performed while the MS is...

In Idle Mode

Where is the C1 calculated?

In the MS

What increments are used for CRO?

Increments of 2

What is the IMEI

International Mobile Equipment Identity

What is the RxLev (Received signal Level)

It is the signal strength of the received signal

Code given to identify a specific location area

LAC

During a mobile terminated call, a page for the target handset is sent out across the ?

LAC

The MSC and VLR control an area called a?

LAC

MCC, MNC, LAC together is?

Local Area Identifier (LAI)

LAC

Location Area Code

What are common control channels and list the associated channels.

Logical channel -PCH -AGCH -RACH

Access Grant Channel (AGCH)

Logical channel used to assign an SDDCH or a TCH to a MS

What are broadcast channels and list the associated channels.

Logical channels -BCCH -SCH -FCCH

What are dedicated control channels and list the associated channels.

Logical channels -SDCCH -SACCH -FACCH

Code used to identify a specific country

MCC

The CGI is composed of what?

MCC, MNC, LAC, and CI

IMSI is composed of?

MCC, MNC, and MSIN

Code used to identify a specific network

MNC

Brains of the network. integrated Services Digital Network Switch (ISDN)

MSC

What controls a LAC?

MSC and VLR

MSC Handover between different LACs?

MSC external handover

Unique number that references a users account information

MSIN

Dialed phone number of mobile station

MSISDN

A temporary number used to route calls in an outside network

MSRN

What does the CRO do?

Makes tower look more attractive to the ME than it really is. ( fake tits on a tower )

Definition of MS_TxPWR_MAX_CCH

Max transmit power levels an MS may use when accessing the network

Definition of Rx_LEV_ACCESS_MIN

Minimum Rx level at the MS needed to access the network

MCC

Mobile Country Code

MNC

Mobile Network Code

MSRN

Mobile Station Roaming Number

MSISDN

Mobile Subscriber Integrated Services Digital Network

MSC

Mobile Switching Center

MSIN

Mobile subscriber identification number

Back end of the network; contains MSC, VLR, AuC, EIR, GMSC, HLR

NSS

What is the strongest six channels calculated by the handset?

Neighbor list

The base Station Identification Code contains what color code?

Network Color Code

Two components that make up the BSIC?

Network Color Code Base Station Color Code

The BCCH transmits ?

Network Identification Information

Broadcast Control Channel (BCCH)

Network Identifying Parameters

NSS

Network Switching Subsystem

Does the ME need to inform the network if it's in the same LAC?

No

Will the MS conduct a location update if it moves to a new cell in the same LAC

No

Will the MS conduct a location update if it moves to a new cell in the same LAC?

No

Where is the CRO sent?

On the BCCH

Where is the BSIC sent?

On the SCH(Sync channel)

What is an ARFCN?

Pair of frequencies, uplink/downlink

The first 6 digits of the IMSI indicates the ?

Public Land Mobile Network (PLMN)

MCC and MNC together is?

Public Land Mobile Network(PLMN)

Identify what triplets are, how they are formed and what they are used for.

RAND, SRES, Kc, used for authentication

What is used to calculate the expected RSSI on a receiver?

Radio Link Budget

RACH

Random Access Channel

Syncs timing and broadcasts BSIC

SCH

Unique to a user and identifies by the IMSI. Stores important info for authentication.

SIM

SDCCH

Standalone Dedicated Control Channel

A dedicated point to point signaling Channel?

Standalone dedicated control Channel (SDCCH)

SIM

Subscriber Identity Module

What does the SIM contain?

Subscriber encryption keys Last LAC User phone books

What channel is the BSIC transmitted on?

Sync

SCH

Synchronization Channel

Make and model of equipment

TAC

What is the IMEI composed of?

TAC, Serial Number and CD ( 8, 6, and 1 digits long

Point to point voice and data communications

TCH

Temporary identifier put in place to mask another sensitive identifier known as the IMSI?

TMSI

What does the network assign temporarily?

TMSI

TMSI

Temporary Mobile Subscriber Identity

TDMA Full-rate

Time slot is yours

What is the purpose of the CI?

To identify a specific sector on a tower

TCH

Traffic Channel

True or False : CRH is used on LAC boundaries?

True

True or False : The BCCH is a logical channel?

True

True or False : The FACCH is sent on the Traffic channel?

True

True or False : The SACCH will notify the MS of incoming messages?

True

True or False : The SACCH_BA_List is used for ARFCN selection in handoffs?

True

True or False : The strongest 6 ARFCNs in the area are the BA_list?

True

True or False : the network handles handoffs?

True

True or False, in the IMEI, the CD (Check Digit) is not transmitted

True

TAC

Type Allocation Code

Definition of IMEI

Unique identifier for the mobile equipment

When the downlink path loss is less than the uplink path loss, the system is said to be :

Uplink limited

Frequency Control Channel

Used for correction of transmission Frequency

Radio Link Budget

Used to calculate expected RSSI on a receiver

FDMA definition

User occupies private frequency, protected from interference

TDMA definition

Users occupy specific frequency but only during assigned timeslots

The database that holds temporary record of an MS' information is the?

VLR

Cell Re-selection Definition

When a channel becomes more favorable than its current channel and the channel is on the MS neighbor list, it will attempt to switch to a new channel

Definition of Cell Reselection

When a channel becomes more favorable than its current channel and the channel on the MS neighbor list, it will attempt to switch to new channel

What is RxQual (Receive Quality)

clarity of signal

GSM

global system for mobile communications


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