CHAPTER 20
CELLULAR TELEPHONE SYSTEM
1)Stands for Standard Cellular Telephone Service
CTS
2)An acronym for Personal Communications System.
PCS
3)Stands for Personal Communications Satellite System.
PCSS
4)An acronym for Advanced Mobile Telephone System.
AMPS
5)Proposed the cellular telephone concept in 1971.
Bell Telephone Laboratories
6)A standard cellular telephone service (CTS) initially placed into operation on Oct. 13, 1983.
AMPS
7)It was used by AMPS cellular telephones with a usable audio-frequency band from 300 Hz to 3 KHz and a maximum frequency deviation of + 12 KHz for 100% modulation.
Narrowband Frequency Modulation (NBFM)
8)Correspond to an approximate bandwidth of 30 KHz.
Carson’s Rule
9)A transmission with simultaneous transmission in both direction.
Full Duplex (FDX) or Duplexing
10)It is used in AMPS and occurs when two distinct frequency bands are provided to each user.
Frequency-division Duplexing
11)A special device used in each mobile unit to allow simultaneous transmission and reception on duplex channels.
Duplexer
12)Transmissions from base station to mobile units.
Forward Links
13)Transmissions from mobile units to base stations.
Reverse Links
14)Another name for forward links.
Down Links
15)Another term for reverse link.
Uplink
16)Additional frequencies of 10 MHz to the original40 MHz band which increased the number of simplex channels by 166 for a total of 832 (416 Full duplex)
Expanded Spectrum
17)Specified frequencies in a small geographic area.
Cellular Geographic Serving Areas (CGSA)
18)Defines geographic areas used by marketing agencies.
Standard Metropolitan Statistical Area
19)A technique used by standard telephone subscriber to access the AMPS system.
Frequency Division Multiple Access
20)A 34 bit binary code which in the U.S. represents the standard 10-digit telephone number.
Mobile Identification Number (MIN)
21)A 34 bit binary code permanently assigned to each mobile unit.
Electronic Serial Number (ESN)
22)Stands for Vehicle Identification Number.
VIN
23)An acronym for Network Interface Card.
NIC
24)A four bit code which indicates whether the terminal has access to all 832 AMPS channel or only 666.
Station Class Mark (SCM)
25)A 15 bit binary code used by FCC to an operating company when it issues it a license To provide AMPS
System Identifier (SID)
26)It is one of the three analog frequencies (5970 Hz, 6000 Hz, or 6030 Hz) that helps mo
bile system distinguish one base station from a neighboring base station.
Supervisory Audio Tone (SAT)
27)One of four binary codes, also helps mobile system distinguish one base station from a neighboring base station.
Digital Color Code (DCC)
28)One set of channels dedicated for exchanging control information between mobile units and base stations.
Control Channels
29)Also termed as Voice channel, used for propagating actual voice conversations or
subscriber data.
User Channel
30)Another name of control channels.
Setup or Paging Channel
31)Sometimes called as Camped.
Locked
32)A sequence of alternating 1s and 0s.
Dotting Scheme
33)A unique sequence of 1s and 0s that enables the receiver to instantly acquire synchronization.
Synchronization Word
34)It controls or command mobile units to do a particular task when the mobile unit has not been assigned a voice channel.
Mobile Station Control Messages
35)It is used to indicate the current status of the reversecontrol channel.
Busy-idle Bits
36)It contains the following:
· System parameter overhead messages
· global action overhead messages
· control filter messages
Typical mobile-unit control messages:
· Initial voice channel designation messages
· directed retry messages
· alert messages
· change power messages
Overhead Message
37)Transmitted at a 10-kbps rate.
Control data includes:
· page responses
· access request
· registration requests
Control Data
38)Transmission of voice.
Blank
39)Data transmission.
Burst
40)The entity of SS7 interoffice protocol that distinguishes the physical components of
the switching network.
Switching Network:
· Signal Service Point
· Signal Control Point
· Signal Transfer Point
Intelligent Network
41)A family of mobile or portable radio comunications services which provides servIces to the individuals and business and is integrated with a variety of competing networks.
Differences in PCS and cellular telephone system:
· Smaller Size
· all digital
· additional features
Personal Communications System (PCS)
42)Acronym for Personal Communications Network.
PCN
43)
It is assigned to everyone which is stored the on the SS7 network.
Personal Telephone Number
44)It determines where and how the call should be directed.
Artificial Intelligence Network (AIN)
45)A database that stores information about the user,including home subscription information and what supplementary services the user is
subscribed to.
Home Location Register (HLR)
46)A database that stores information pertaining to theidentification and type of equipment that exists in the mobile unit.
Equipment Identification Registry (EIR)
47)It 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
48) The PCS equivalent of caller ID.
Screen Mode
49)All calls except those specified by the subscriber are automatically forwarded to a forwarding destination without ringing the subscriber’s handset.
Private Mode
50)No calls are allowed to pass through to the subscriber.
Unavailable Mode
51)PCS operating in the 1900 MHz range.
PCS 1900
52)Interference avoidance scheme which uses voice companding to provide synthetic
voice channel quieting.
Interference (MRI)
53)A narrowband AMPS system that increased the capacity of the AMPS system in large
cellular market.
N-AMPS
54)It is developed with the intent of supporting a higher user density within a fixed
bandwidth frequency spectrum.
United States Digital Cellular
55)Cellular telephone systems that use digital modulation.
Digital cellular
56)Allows one mobile unit to use a channel at the same time by further dividing
transmissions within each cellular channel.
Time-division Multiple Accessing (TDMA)
57)A database that stores information about subscriber in a particular MTSO serving area, such as whether the unit is on or off
Visitor Location Register(VLR)
58)Technique used that allows more mobile-unit subscribers to use a system at virtually the Same time within a given geographical area.
Time-Sharing Channels
59)It stands for Electronics Industries Association and Telecommunications Industry Association.
EIA/TIA
60)It specifies that a mobile station complying with the IS-54 standard must be capable of operating in either the analog AMPS or the digital (USDC) mode for voice transmissions.
Dual Mode
61)It is often called North American Time Division Multiple Accessing.
IS-136.2
62)It was introduced to provide PSK rather than FSK on dedicated USDC control channels to in crease the control data rates and provide additional specialized services such as paging and short messaging between private mobile user groups.
IS-54 Rev.C
63)Allows for brief paging-type messages and Short e-mail messages that can be read on the mobile phone’s display and entered using the keypad.
Short Message Service
64)It was developed to provide a host of new features and services, positioning itself in a competitive within the newer PCS systems.
IS-136
65)It is used by mobile units to request access to the cellular telephone system. It is a
unidirectional channel specified for transmissions from mobile-base units only.
Random Access Channel (RACH)
66)It is used to transmit information from base stations to specific mobile stations.
SMS point-to-point Paging and access response Channel (SPACH)
67)
It is dedicated to delivering pages and orders.
It transmit :
· paging messages
· message-waiting messages
· user alerting messages
· call history count updates
· shared secret data updates
Paging Channel (PCH)
68)A logical subchannel of SPACH used to carry assignments to another resource or other responses to the mobile station’s access attempt.
Access Response Channel (ARCH)
69)It is used to deliver short point-to-point messages to a specific mobile station.
SMS Channel (SMSCH)
70)It refers to : F-BCCH, E-BCCH and S-BCCH logical sub channels.
Channel (BCCH)
71)Broadcasts digital control channel structure parameters.
Fast Broadcasts Control channel (F-BBCH)
72)Carries less critical broadcast information than F-BCCH intended for mobile units.
Extended Broadcasts Control Channel (E-BBCH)
73)Individual mobile units. A logical channels used for sending short messages.
SMS Broadcasts Control channel (F-BBCH)
74)Stands for Digital speech interpolation.
DSI
75)
Carries digital voice information and consists of RDTC and FDTC.
Digital Traffic Channel(DTC)
76)It consists of an eight bit digital voice color code number between 1 and 255 appended with four Coded Digital Verification
Color Code
77)Mobile-assisted handoff.
MAHO
78)A blank-and burst type of transmission that replaces digitized speech information with control and supervision messages with in a subscriber’s time slot.
Fast Associated Control Channel (FACCH)
79)A special speech coder.
Vector sum exciter linear predictive (VSLP)
80)A special microprocessor that is implemented on the telephone handset.
Digital Signal Processor (DSP)
81)They are transmitted when a mobile unit begins operating in a larger diameter cell.
Shortened Burst
82)An access method used with standard analog AMPS which use frequency channelization approach to frequency spectrum management.
FDMA
83)It allows users to differentiate from one another by a unique code rather than a frequency or time assignment.
Code Division Multiple Accessing (CDMA)
84)Stands for Qualcom 9600bps Code-Excited Linear Predictive coder.
QCELP
85)The concept is to break the message into fixed sized blocks of data with each block transmitted in sequence except on a different carrier.
Frequency Hopping
86)high bit pseudorandom code is added to a low-bit rate information signal to generate a high bit rate pseudorandom signal closely resembling noise that contains both the original data signal and the pseudo random code must be known.
Direct-Sequence
87)
It is a study group which is sometimes referred to as Pan-European cellular system. This is now known as the Global System for Mobile
Communications.
Classification of GSM telephone services:
· Bearer Services
· teleservices
· supplementary services
Three primary subsystem of GSM:
· Base Station Subsystem
· Network Switching Subsystem
· Operational Support Subsystem
Groupe Special Mobile (GSM)
88)All-digital data Network.
Integrated Services Digital Network (ISDN)
89)Sometimes known as radio subsystem, provides and manages radio frequency transmission paths between mobile units and the mobile switching center (MSC)
Base Station Subsystem (BSS)
90)It manages switching functions for the system and allows MSCs to communicate with other telephone networks.
Network Switching Subsystem (NSS)
91)The available forward and reverse frequency bands are subdivided into 200 KHz wide voice channels.
Absolute Radio-Frequency Channel Numbers (ARFCN)
92)It provides the vehicle for a new generation of wireless telephone services called Personal Communications Satellite System (PCSS)
Mobile Satellite Systems (MSS)
93)It uses low earth-orbit (LEO) and medium earth orbit and MEO thar communicates diretly with small, low-powered mobile telephone units.
key providers in PCSS market:
· American Mobile Satellite
Communications (AMSC)
· Celsat
· Comsat
· Constellation Communications (ARIES)
· Ellipsat (Ellipso)
· INMARSAT
· LEOSAT
· Loral/qualcomm (global star)
· TMI communications
· TWR (Odysse)
· Iridium LLC
Personal Communications Satellite System (PCSS)
94)An international consortium owned by a host of prominent companies, agencies and governments.
Iridium LC
95)The largest commercial venture undertaken in the history of the world.
Iridium Project
96)A satellite based wireless personal communications network designed to permit a wide range of mobile telephone services, including voice, data, networking,facsimile and paging.
Iridium
97)FCC issued a report and order Dockett # 92-166 defining L band frequency sharing for subscriber units in the 1616 MHZ to 1626.5 MHz band.
October 14, 1994
98)L-band subscriber-to-satellite voice links.
1.616 GHz to 1.6265 GHz
99)Ka-band gateway downlinks.
19.4 GHz to 19.6 GHz
100)Ka-band gateway uplinks
29.1 GHz to 29.3 GHz
101)Ka-intersatellite cross-links
23.18 GHz to 23.38 GHz
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