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IFT372 > Midterm > Flashcards

Midterm Flashcards

(63 cards)

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1
Q

What is an Resource Block (RB)?

A

Reduces overhead required by assigning individual symbol to a certain user

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2
Q

What is in a Resource Block (RB)?

A

Seven symbols on the time axis. 12 sub-carriers on the frequency access which takes 0.5 ms to transmit.

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3
Q

The FCC regulates prices, data sizes, and plans including cell patterns and frequency reuse patterns. If false, which does?

A

False.
Correct answer: Operators

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4
Q

The Base Station Controller connects calls between mobile units. If false, which does?

A

False.
Correct answer: Mobile Telecommunications Switching Office (MTSO)

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5
Q

The SIM card enables international roaming independent of mobile equipment. If false, which does?

A

True.

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6
Q

What are the characteristics of a Visited Location Register (VLR)?

A

• One VLR can support multiple MSCs
• Has some permanent mobile station data

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7
Q

To obtain a service with a mobile station, you need a valid ________, a valid ________ in a valid ________.

A

SIM, IMSI, IMEI

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8
Q

Which entity in GSM consists of mobile switching centers and the databases which store the data required for routing and service provisioning?

A

Mobile Switching and Management Subsystem

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9
Q

What is the purpose of the home location register (HLR)?

A

It acts as a database repository for all information related to a subscriber

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10
Q

Within a GSM radio network, there are two kinds of channels: _________ channels and ________ channels.

A

traffic, signaling

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11
Q

The two primary methods a Base Transceiver Station (BTS) uses to communicate with several subscribers at the same time are ______ and ______.

A

FDMA and TDMA

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12
Q

________ ensures there is a valid IMEI and SIM for a registered user.

A

Authentication

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13
Q

An ideal mobile device would always be instantly reachable and ready to transfer data at any time.

A

True

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14
Q

UMTS does not have strong security measures to prevent unauthorized use and eavesdropping.

A

False.

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15
Q

The E-DCH concept in UMTS increases the uplink speed per user to up to 2 mbps in ideal conditions and up to 800 kbps under normal conditions in operational networks.

A

True

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16
Q

In the UMTS channel structure, what is the role of the transport channel?

A

Prepares data packets that are received from logical channels for transmission over the air interface.

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17
Q

The Serving GPRS Support Node (SGSN) PMM detached occurs when __________.

A

Mobile device is switched off and location unknown. No assigned IP address.

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18
Q

What is the purpose of a scrambling code in UMTS?

A

To allow mobile devices to distinguish different cells of a network which send on the same frequency.

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19
Q

In Cell-_____ state the mobile device sends and receives frames that are shared among several devices.

A

FACH

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20
Q

UMTS separates functionalities of the ____ network and the ____ network.

A

core, access

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21
Q

With a R99 access network, data rates up to _____ in downlink and ____ in uplink are possible

A

384 kbps, 128 kpbs

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22
Q

In LTE, ciphering of RRC messages is mandatory.

A

False.

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23
Q

Data Transmissions in LTE are controlled by the mobile device. If false, what is it controlled by?

A

False.
Correct answer: the network

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24
Q

Mobility Management Entity (MME) is the network node responsible for all signaling exchanges between the base station and the core network and between users and the core network.

A

True.

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25
What is relevant and true about mobile networks when connected to the internet using IPv6?
• Most current mobile networks assign private non-routable IPv4 addresses to their customers and use Network Address Translation (NAT). • Network does not assign IPv6 address to a mobile device.
26
In LTE, how long does it take to transmit seven symbols of a resource block?
0.5 ms
27
Which network node is responsible for all signaling exchanges between the base station and the core network and between users and the core network?
MME
28
In ____ state, no bearer is established to the network and the UE autonomously controls cell changes and changes to the other radio networks.
Idle
29
____ handovers require the help of the MME and are used when two eNBs are unable to communicate with each other.
S1
30
Name the most important components of the GSM architecture.
Home Location Register (HLR) Mobile Switching Center (MSC) Location Area (LA) Base Station Controller (BSC)
31
Which algorithm is used to digitize a voice signal for transmission in a digital circuit-switched network? At what data rate is the voice signal transmitted?
Pulse Code-Modulated (PCM) signal ; 64 kbps
32
What is CAMEL? Which service is CAMEL normally used?
Customized Applications for Mobile Enhanced Logic (CAMEL) extends GSM services outside of subscribers' home networks.
33
What is Cell Breathing?
When a cell coverage area is reduced because there is a high activity of devices transferring data.
34
In which RRC states may a mobile device be in PMM connected mode?
Cell-FACH, Cell-DCH, Cell-PCH, or URA-PCH
35
What are the three channels in a UMTS structure?
Physical, Logical, and Transport
36
What happens in a Cell-DCH state?
A dedicated channel with an individual code is assigned to a mobile device and data is being transmitted continuously.
37
What happens in a Cell-FACH state?
Several devices are sharing one channel. Bandwidth capacity is limited.
38
LTE uses circuits for quality of service (QoS) control.
False. It uses bearers.
39
End-to-end service is completely controlled by LTE.
False.
40
VoLTE capable LTE devices cannot send and receive traditional SMS messages.
False.
41
IMS VoLTE devices uses ____ to register with the IMS system when switched on.
SIP
42
Main inefficiency of VoIP data streams is the ______ from the IP headers on each packet.
Overhead
43
When a subscriber is not currently in the LTE radio network, what happens to the incoming call?
It gets forwarded to the MSC at which subscriber is currently registered.
44
What type of bearer is most commonly used for voice, interactive video, or real-time gaming?
Guaranteed Bit Rate
45
In _______ bearers, performance is more dependent on the number of UEs served by the eNodeB and the system load.
Non-guaranteed bit rate
46
Call forwarding settings are managed via the ____ protocol between the UE and the network.
XCAP
47
In VoLTE S8-Home Routing (S8HR), all signaling and path traffic routed through _______ interface instead of _______.
S8 interface; P-GW
48
How many subcarriers are used for a 10MHz FDD-LTE channel?
600
49
______ is based on 200 kHz carriers split into eight time slots for voice calls
GSM
50
_____ is at MAC layer. ____ is at RLC layer.
HARQ; ARQ
51
____ handover occurs when current and gaining eNBs directly communicate with each other.
X2
52
_____ is done via the SGs interface which connects the MME to Mobile Switching Centers in the 2G/3G networks to deliver SMS over LTE
CS-Fallback
53
What is the purpose of NAT?
Network Address Translation (NAT) is a way to map multiple local private addresses to a public one.
54
What is the role of the FCC?
It regulates where cellular data can be used and which frequency operators are allowed to access.
55
What is the handover procedure?
When a subscriber that already has an established connection with the network changes their location.
56
Which network component is involved with the handover procedure?
The MSC
57
How is data stored on a SIM card?
It's stored in non-volatile, re-writable memory.
58
What is the CDMA? Which generation is it apart of (GSM, UMTS, LTE)?
Assigns a unique channelization code so that a single base station can communicate with multiple devices simultaneously.
59
What happens during compressed mode?
Data transmission is compressed to let mobile devices search for other cells in a different frequency. This happens when there is high activity of data transmitting.
60
During what state does compressed mode happen?
Cell-DCH state
61
____ is a generic protocol used for the establishment of a connection between two or more parties.
Session Initiation Protocol (SIP)
62
______ sends and receives traditional SMS messages via an LTE signaling channel and the SGs interface
Non-VoLTE capable LTE devices
63
What is the XCAP protocol?
XML Configuration Access Protocol is used to store confirguration data in XML format and users are allowed to read/write/modify.

IFT372 (2 decks)

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