Mobile Basics Flashcards by Prabhash K P

Cells with particular shape
1)Pico cells
2) umbrella cells

pico cells

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_____ cell covers several micro cells
1)Pico cells
2) umbrella cells

umbrella cell

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When the speed of the mobile is too high, the mobile is handed over to the ______ cell
1) neighbour cells
2) umbrella cells

umbrella cell

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Sectorisation
1) 120 deg
2) 60 deg
3) both

both 60 deg and 120 deg

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The three sector case is generally used with a _____ cell pattern
1) three
2) seven
3) twelve

seven

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The three sector case results in _____ channel sets
1) 12
2) 21
3) 24

The three sector case is generally used with a seven cell pattern, giving an overall requirement for 21 channel sets.

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________ allows a much higher subscriber density per MHz of spectrum
than other systems
1) frequency reuse
2) frequency hoping
3) higher bandwidth

frequency reuse

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____________ requires the mobile to change frequencies under control of the cellular network
1) frequency reuse
2) handover

handover

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HSDPA stands for ____
1) High Speed Downlink Packet Access
2) High Speed Data Packet Access

High Speed Downlink Packet Access

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No duplexer is required for
1) FDD
2) TDD

TDD
uses different time slots for transmission and reception paths. . Only a fast switching synthesizer, RF filter path and fast antenna switch are
needed

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It increases the battery life of mobile phones
1) FDD
2) TDD

TDD

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GSM-900 (P-GSM) uplink
1) 895 - 920 Mhz
2) 890 - 915 Mhz
3) 880 - 915 Mhz
4) 880 - 905 Mhz

890 - 915 Mhz
25MHz width

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GSM-900 (P-GSM) downlink
1) 920 - 945 Mhz
2) 925 - 950 Mhz
3) 930 - 955 Mhz
4) 935 - 960 Mhz

935 - 960 Mhz
25MHz width

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GSM-900 (P-GSM) Duplex Distance
1) 25 MHz
2) 45 MHz
3) 75 MHz
4) 95 MHz

45 MHz
935-890=45
960-915=45

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GSM-900 (P-GSM) Frequency Channels
1) 128
2) 124
3) 200
4) 374

124

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DSC-1800 uplink
1) 1790 - 1865 MHz
1) 1720 - 1795 MHz
1) 1710 - 1785 MHz
1) 1705 - 1780 MHz

1710 - 1785 MHz
75MHz width

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DSC-1800 downlink
1) 1805 - 1880 MHz
2) 1815 - 1890 MHz
3) 1795 - 1870 MHz
4) 1805 - 1880 MHz

1805 - 1880 MHz
75MHz width

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DSC-1800 Duplex Distance
1) 25 MHz
2) 45 MHz
3) 75 MHz
4) 95 MHz

95 MHz
1805-1710=95
1880-1785=95

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DSC-1800 Frequency Channels
1) 128
2) 124
3) 200
4) 374

374

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GSM-900 and 1800 Carrier separation
1) 25MHz
2) 200MHz
3) 100KHz
4) 200KHz

200 KHz

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GSM-900 and 1800 Voice coder bit rate
1) 4 kbps
2) 9 kbps
3) 13 kbps
4) 16 kbps

13 Kbps

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GSM-900 and 1800 Modulation
1) QPSK
2) GMSK
3) QAM

GMSK

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GSM-900 and 1800 Air transmission Rate
1) 120 kbps
2) 270 kbps
3) 320 kbps

270.8333 Kbps

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GSM-900 and 1800 Access Method
1) FDMA
2) TDMA
3) CDMA

1 and 2
FDMA/TDMA

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??? GSM-900 and 1800 Speech Coder 1) RPE-LTP 2) REP-LTP 3) REP-LPT 4) RPE-LPT

RPE-LTP

GSM-900 and 1800 Duplexing 1) TDD 2) FDD

FDD

GSM subsystems 1) BSS 2) NSS 3) OSS 4) All

All Base Station Subsystem (BSS) Network Switching Subsystem (NSS) Operation Support Subsystem (OSS)

Four databases associated with MSC 1) HLR 2) ___ 3) ___ 4) ___

HLR, VLR, EIR and AUC

MS-BTS interface 1) Un 2) Abis 3) A 2) B

BTS-BSC interface 1) Un 2) Abis 3) A 2) B

Abis

BSC-MSC interface 1) Un 2) Abis 3) A 2) B

MSC-VLR interface 1) Un 2) Abis 3) A 2) B

MSC-HLR interface 1) A 2) B 3) C 2) D

MSC-EIR interface 1) E 2) F 3) G 2) H

MSC-other MSC interface 1) E 2) F 3) G 2) H

VLR-HLR interface 1) A 2) B 3) C 2) D

VLR-other MSC's VLR interface 1) E 2) F 3) G 2) H

Upon request, the MS sends IMEI number over the signalling channel to the MSC (T/F)

MSISDN stands for___

Mobile Subscriber ISDN Number Mobile Station ISDN Number

_______ is used by the land network to route calls toward an appropriate MSC 1) IMEI 2) MSISDN 3) IMSI 4) TMSI

MSISDN

IMSI stands for___

international mobile subscriber identity

______ is the primary identity of the subscriber within the mobile network and is permanently assigned to him 1) IMEI 2) MSISDN 3) IMSI 4) TMSI

IMSI

This number can be periodically changed by the system and protect the subscriber from being identified by those attempting to monitor the radio channel 1) IMEI 2) MSISDN 3) IMSI 4) TMSI

TMSI

Five different categories of mobile telephone units 20W, ______

20W, 8W, 5W, 2W, and 0.8W

SIM card PIN is stored ____ 1) within the SIM 2) in the network

within the SIM

______compares radio transmission and reception devices, up to and including the antennas, and also all the signal processing specific to the radio interface 1) BTS 2) BSC

BTS

A single transceiver within BTS supports ______ basic radio channels of the same TDM frame. 1) four 2) eight 3) two

eight

A ______is a network component in the PLMN that function for control of one or more BTS. It is a functional entity that handles common control functions within a BTS. 1) BTS 2) BSC 3) MSC

BSC

BTS is typically able to handle _________ radio carriers, carrying between 24 and 40 simultaneous communication. 1) one to three 2) three to five 3) five to seven

three to five

TRAU in BSS stands for

Transcoder/Rate Adapter Unit

TRAU (sub part of BTS) is situated at a) BTS b) BSC c) between the BSC and the MSC d) All of the above

All of the above

TRAU is a subpart of 1) BTS 2) BSC 3) MSC

BTS TRAU: Transcoder/Rate Adapter Unit

MSC and the BSS is a 1) V2 2) SS7

standardized SS7 interface

A interface is 1) V2 2) SS7

standardized SS7 interface

The _____ performs the Radio Resource (RR) management for the cells under its control. 1) BTS 2) BSC 3) MSC

BSC

It assigns and release frequencies and timeslots for all MSs in its own area 1) BTS 2) BSC 3) MSC

BSC

It performs the inter-cell handover for MSs moving between BTS in its control 1) BTS 2) BSC 3) MSC

BSC

It reallocates frequencies to the BTSs in its area to meet locally heavy demands during peak hours or on special events 1) BTS 2) BSC 3) MSC

BSC

controls the power transmission of both BSSs and MSs in its area 1) BTS 2) BSC 3) MSC

BSC

The minimum power level for a mobile unit is broadcast over the ___channel 1) SCCH 2) BCCH

BCCH

It measures the time delay of received MS signals relative to the BTS clock 1) BTS 2) BSC

BSC

BSC 1) measures the time delay of received MS signals 2) performs traffic concentration to reduce the number of transmission lines from the BSC to its BTS 3) both

both

the time and frequency synchronization reference signals broadcast by BTS is provided by 1) BTS 2) BSC 3) MSC

BSC

MSC performs functions 1) paging 2) resource allocation 3) location registration and encryption 4) all the above

all the above

The dynamics allocation of access resources is done by ____ in coordination with the ____. 1) BTS, BSC 2) MSC, BSS 3) BSS, MSC

MSC in coordination with the BSS

____ decides when and which types of channels should be assigned to which MS. 1) BTS 2) BSC 3) MSC

MSC

The channel identity and related radio parameters are the responsibility of the _____ 1) BTS 2) BSS 3) MSC

BSS

The MSC performs billing on calls for _______ based in its areas. 1) home subscribers 2) all subscribers

all subscribers

When the subscriber is roaming elsewhere, the MSC obtains data for the call billing from the _____ 1) home MSC 2) visited MSC

visited MSC

Encryption parameters transfers from VLR to BSS to facilitate ciphering on the radio interface are done by ___ 1) BTS 2) BSS 3) MSC

MSC

It acts as a message mailbox and delivery system 1) BTS 2) BSS 3) MSC

MSC

When a MS appears in a _____, it starts a registration procedure 1) BTS Area 2) LA 3) MSC area

____ is the reference database for subscriber parameters. 1) HLR 2) VLR

HLR

______ is the reference database for various identification numbers and addresses as well as authentication parameters 1) HLR 2) VLR

HLR

______ is the reference database for various services subscribed, and special routing information 1) HLR 2) VLR

HLR

______ is the reference database for subscriber’s temporary roaming number and associated VLR if the mobile is roaming 1) HLR 2) VLR

HLR

The ____ provides the current location data needed to support searching for and paging the MS-SIM for incoming calls, wherever the MS-SIM may be. 1) HLR 2) VLR

HLR

The ____ is responsible for storage and provision of SIM authentication and encryption parameters needed by the MSC where the MS-SIM is operating. It obtains these parameters from the AUC. 1) HLR 2) VLR

HLR

The VLR is collocated with an MSC T/F

True

The ___ stores the identification of SMS gateways that have messages for the subscriber under the SMS until they can be transmitted to the subscriber and receipt is knowledge 1) HLR 2) VLR

HLR

select true 1) Both the HLR and the VLR can be implemented in the same equipment in an MSC (collocated) 2) A PLMN may contain one or several HLRs. 3) both 4) none

both

Authentication information and ciphering keys are stored in a database within the ________ 1) HLR 2) VLR 3) AUC

AUC

the mobile must provide the correct ________ in answer to a random number (RAND) generated by AUC 1) SSRE 2) SRES 3) RESS

Signed Response (SRES)

Ki and the cipher key Kc are _____ across the air interface between the BTS and the MS 1) never transmitted 2) sometimes transmitted

never transmitted

The cipher key is transmitted on the ____ between the home HLR/AUC and the visited MSC 1) DLS 2) HLS 3) SS7

SS7 link

The cipher key is transmitted on the SS7 link between the home HLR/AUC and the ________ 1) home MSC 2) visited MSC

visited MSC

cipher key is supposed to change with each phone call (T/F)

AUC will often be physically included with the ___ 1) HLR 2) VLR

HLR

Choose correct a) AUC will use separate processing equipment for the AUC database functions. b) AUC will often be physically included with the HLR 1) a 2) b 3) both 4) none

both

_____ is a database that stores the IMEI numbers for all registered ME units 1) HLR 2) VLR 3) EIR

EIR

Choose correct a) There is generally one EIR per PLMN b) EIR keeps track of all ME units in the PLMN 1) a 2) b 3) both 4) none

both

EIR class contains all MEs with faults not important enough for barring 1) White 2) Grey 3) Black

Grey List

a part of MSC, which provides the subscriber with access to data rate and protocol conversion facilities 1) EC 2) IWF

Interworking Function (IWF)

data can be transmitted between GSM Data Terminal Equipment (DTE) and a land-line DTE with the help of ____ 1) EC 2) IWF

Interworking Function (IWF)

EC is used on the ___ side of the MSC 1) PLMN 2) PSTN

PSTN

_______ is required at the MSC PSTN interface to reduce the effect of GSM delay when the mobile is connected to the PSTN circuit 1) EC 2) IWF

The total round-trip delay introduced by the GSM system, which is the result of speech encoding, decoding and signal processing, is of the order of _____ ms 1) 1 ms 2) 18 ms 3) 180 ms

180 ms

The standard EC cancels about ___ ms of delay. 1) 70 ms 2) 180 ms 3) 10 ms

70 ms

The _____ also keeps track of the different software versions running on different subsystems of the GSM. 1) OMC 2) MSC 3) HLR

OMC

IMSI consists of 1) MCC a mobile country code 2) MNC mobile network code 3) MSIN mobile subscriber identification number 4) All

All

The correlation of a ____ to an IMSI only occurs during a mobile subscriber’s initial transaction with an MSC 1) TMSI 2) MSRN 3) IMEI

TMSI

MSISDN consists of 1) CC country code 2) NSN National Significant Number 4) both

both

NSN shall not exceed _____ digits 1) 10 2) 15 3) 7

________ is assigned upon demand by the HLR on a per-call basis.

1) TMSI 2) MSRN

is used to determine authorized (white), unauthorized (black), and malfunctioning (gray) GSM hardware 1) TMSI 2) MSRN 3) IMEI

IMEI

___ is never sent in cipher mode by MS 1) TMSI 2) MSRN 3) IMEI

IMEI