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Cellular Telephone Concepts - Tomasi Flashcards

(64 cards)

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1
Q

ARTS

A

American Radio Telephone Service

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2
Q

AMPS

A

Advance Mobile Phone System

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3
Q

USDC

A

U.S. Digital Cellular

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4
Q

TIA

A

Telecommunications Industry Assiciation

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5
Q

PCSS

A

Personal Communications Satellite Systems

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6
Q

Why hexagon shape is chosen as the shape of a cell?

A

because it provides the most effective transmission by approximating a circular pattern while eliminating gaps inherently present between adjacent circles

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7
Q

Large cells or macrocells have radius between __ and base station transmit power of:

A

1 mile and 15 miles

1W and 6W

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8
Q

Smallest cells or microcells have radius between __ and base station transmit power of:

A

1500 ft or less

0.1 W and 1W

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9
Q

Process in w/c the same set of frequencies can be allocated to more than one cell, provided the cells are separated by sufficient distance

A

Frequency Reuse

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10
Q

Cluster size typically equal to

A

3,7,12

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11
Q

allows more calls to be handled by the system, provided the cells do not become too small

A

Cell Splitting

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12
Q

2 major kinds of interference produced within cellular telephone system

A

co-channel interference

adjacent channel interference

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13
Q

interference between 2 cells using the same set of frequencies

A

co-channel interference

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14
Q

occurs when transmissions from adjacent channels interfere with each other

A

adjacent-channel interference

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15
Q

most prevalent when a mobile unit is receiving a weak signal from the base station

A

near-far effect

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16
Q

when the area of a cell, or independent component coverage areas of a cellular system is further divided thus creating more cell areas

A

cell splitting

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17
Q

the point when a call reaches maximum capacity occurs when the number of of subscribers wishing to place a call at any given time equals the number of channels in the cell

A

maximum traffic load

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18
Q

Major drawback of cell splitting:

A

it results to more base station transfers (handoffs) per call and higher processing load per subscriber

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19
Q

process of subdividing highly congested cells into smaller cells; resizing or redistribution of cell areas

A

Cell Splitting

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20
Q

decreasing co-channel interference while increasing capacity by using directional antennas is called

A

Sectoring

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21
Q

placing 2 receive antennas; improves reception by effectively providing a larger target for signals radiated from mobile units

A

Space Diversity

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22
Q

Controls channel assignment, call processing, call setup and call terminations w/c includes signaling switching, supervision and allocating radio-frequency channels

A

MTSO / Mobile Telephone Switching Office

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23
Q

Only facility that connect an MTSO

A

Trunk Circuits

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24
Q

Connection that is momentarily broken during the cell-cell transfer

A

Hard Handoff

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25
A flawless handoff; No perceivable interruption of service
Soft Handoff
26
Stages of handoff (4)
- initiation - resource reservation - execution - completion
27
occurs when a signal level drops below a usable level and there are no usable channels available in the target cell to switch to
Blocking
28
Roaming from one company's calling area to another company's calling area is called __
Interoperator Roaming
29
MTS
Mobile Telephone Systems
30
PTT
Push-to-talk
31
IMTS
Improved Mobile Telephone Systems
32
The term ____ suggested any radio transmitter, receiver or transceiver that could be moved while in operation
Mobile
33
The term ____ described a relatively small radio unit that was handheld, battery powered and easily carried by a person moving at walking speed.
Portable
34
The modern, all-inclusive definition of a ___ ___ is any wireless telephone capable of operating while moving at any speed, battery powered and small enough to be easily carried by a person.
Mobile Telephone
35
Are fixed-position transceivers with relatively high-power transmitters and sensitive receivers.
Base Stations
36
Most two-way mobile radio systems can access the PTN only through a special arrangement called ___, and then they are limited to half-duplex operation where neither party can interrupt the other.
Autopatch
37
The cells that collectively use the complete set of available channel frequencies make up the ___
Cluster
38
is inversely proportional to the number of cells in a cluster
Frequency Reuse Ratio
39
cells without gaps in between
tessellate
40
It occurs if a new call is initiated in an area where all channels are in use
Blocking
41
It handles all cell-site control and switching functions
Cell-Site Controller
42
IS-41 relies on a feature called ___
Autonomous Registration
43
The process where a mobile unit notifies a serving MTSO of its presence and location through a base station controller
Autonomous Registration
44
Cellular Telephone Network Component (6)
- Electronic Switching Center - Cell-Site Controller - Radio Transceivers - System Interconnects - Mobile and Portable Telephone Units - Communication Protocol
45
Is a digital telephone exchange located in the MTSO that is the heart of a cellular telephone system
Electronic Switching Center
46
Each cell contains a BSC that operates under the direction of a switching center (MTSO)
Cell-Site Controller
47
Are also part of the base station subsystem
Radio Transceivers
48
Four-wire leased lines are generally used to connect switching centers to cell sites and to the PTN
System Interconnects
49
Governs that way telephone calls are established and disconnected
Communication Protocol
50
The actual voice channel where mobile users communicate directly with other mobile and wireline subscribers through a base station
User Channel
51
Used for transferring control and diagnostic information between mobile users and a central cellular telephone switch through a base station
Control Channel
52
Base station TRANSMITS on __
Forward control channel & Forward voice channel
53
Base station RECEIVES on __
Reverse control channel & Reverse voice channel
54
Divide a group of channels into smaller groupings or segments of mutually exclusive frequencies
Segmentation
55
Is a means of avoiding co-channel interference, although it lowers the capacity of a cell by enabling reuse inside the reuse distance, which is normally prohibited
Segmentation
56
Is a means of avoiding full-cell splitting where the entire area would otherwise need to be segmented into smaller cells
Dualization
57
Transmission from base stations to mobile units are called
Forward Links
58
Transmission from mobile units to base station are called
Reverse Links
59
Forward links are sometimes called
Downlinks
60
Reverse links are sometimes called
Uplinks
61
Mode that allows all calls to pass through the network to the subscriber except for a minimal number of telephone numbers that can be blocked
Available Mode
62
Mode that is the PCS equivalent to called ID; the name of the calling party appears on the mobile unit's display
Screen Mode
63
Mode wherein all calls except those specified by the subscriber are automatically forwarded to a forwarding destination without ringing the subscriber's handset
Private Mode
64
Mode wherein no calls are allowed to pass through the subscriber
Unavailable Mode

Telephony (9 decks)

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