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Telephony > Cellular Telephone Concepts - Tomasi > Flashcards

Cellular Telephone Concepts - Tomasi Flashcards

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
Q

A flawless handoff; No perceivable interruption of service

A

Soft Handoff

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26
Q

Stages of handoff (4)

A
  • initiation
  • resource reservation
  • execution
  • completion
27
Q

occurs when a signal level drops below a usable level and there are no usable channels available in the target cell to switch to

A

Blocking

28
Q

Roaming from one company’s calling area to another company’s calling area is called __

A

Interoperator Roaming

29
Q

MTS

A

Mobile Telephone Systems

30
Q

PTT

A

Push-to-talk

31
Q

IMTS

A

Improved Mobile Telephone Systems

32
Q

The term ____ suggested any radio transmitter, receiver or transceiver that could be moved while in operation

A

Mobile

33
Q

The term ____ described a relatively small radio unit that was handheld, battery powered and easily carried by a person moving at walking speed.

A

Portable

34
Q

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.

A

Mobile Telephone

35
Q

Are fixed-position transceivers with relatively high-power transmitters and sensitive receivers.

A

Base Stations

36
Q

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.

A

Autopatch

37
Q

The cells that collectively use the complete set of available channel frequencies make up the ___

A

Cluster

38
Q

is inversely proportional to the number of cells in a cluster

A

Frequency Reuse Ratio

39
Q

cells without gaps in between

A

tessellate

40
Q

It occurs if a new call is initiated in an area where all channels are in use

A

Blocking

41
Q

It handles all cell-site control and switching functions

A

Cell-Site Controller

42
Q

IS-41 relies on a feature called ___

A

Autonomous Registration

43
Q

The process where a mobile unit notifies a serving MTSO of its presence and location through a base station controller

A

Autonomous Registration

44
Q

Cellular Telephone Network Component (6)

A
  • Electronic Switching Center
  • Cell-Site Controller
  • Radio Transceivers
  • System Interconnects
  • Mobile and Portable Telephone Units
  • Communication Protocol
45
Q

Is a digital telephone exchange located in the MTSO that is the heart of a cellular telephone system

A

Electronic Switching Center

46
Q

Each cell contains a BSC that operates under the direction of a switching center (MTSO)

A

Cell-Site Controller

47
Q

Are also part of the base station subsystem

A

Radio Transceivers

48
Q

Four-wire leased lines are generally used to connect switching centers to cell sites and to the PTN

A

System Interconnects

49
Q

Governs that way telephone calls are established and disconnected

A

Communication Protocol

50
Q

The actual voice channel where mobile users communicate directly with other mobile and wireline subscribers through a base station

A

User Channel

51
Q

Used for transferring control and diagnostic information between mobile users and a central cellular telephone switch through a base station

A

Control Channel

52
Q

Base station TRANSMITS on __

A

Forward control channel & Forward voice channel

53
Q

Base station RECEIVES on __

A

Reverse control channel & Reverse voice channel

54
Q

Divide a group of channels into smaller groupings or segments of mutually exclusive frequencies

A

Segmentation

55
Q

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

A

Segmentation

56
Q

Is a means of avoiding full-cell splitting where the entire area would otherwise need to be segmented into smaller cells

A

Dualization

57
Q

Transmission from base stations to mobile units are called

A

Forward Links

58
Q

Transmission from mobile units to base station are called

A

Reverse Links

59
Q

Forward links are sometimes called

A

Downlinks

60
Q

Reverse links are sometimes called

A

Uplinks

61
Q

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

A

Available Mode

62
Q

Mode that is the PCS equivalent to called ID; the name of the calling party appears on the mobile unit’s display

A

Screen Mode

63
Q

Mode wherein all calls except those specified by the subscriber are automatically forwarded to a forwarding destination without ringing the subscriber’s handset

A

Private Mode

64
Q

Mode wherein no calls are allowed to pass through the subscriber

A

Unavailable Mode

Telephony (9 decks)

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