This is the summary notes of the important terms and concepts in Chapter 20 of the book "Electronic Communications System" by Wayne Tomasi. The notes are properly synchronized and concise for much better understanding of the book. Make sure to familiarize this review notes to increase the chance of passing the ECE Board Exam.
Stands for Standard Cellular Telephone Service
An acronym for Personal Communications System.
Stands for Personal Communications Satellite System.
An acronym for Advanced Mobile Telephone System.
Proposed the cellular telephone concept in 1971.
Bell Telephone Laboratories
A standard cellular telephone service (CTS) initially placed
into operation on Oct. 13, 1983.
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
Correspond to an approximate bandwidth of 30 KHz.
A transmission with simultaneous transmission in both
Full Duplex (FDX)
It is used in AMPS and occurs when two distinct frequency
bands are provided to each user.
A special device used in each mobile unit to allow
simultaneous transmission and reception on duplex channels.
Transmissions from base station to mobile units.
Transmissions from mobile units to base stations.
Another name for forward links.
Another term for reverse link.
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
Specified frequencies in a small geographic area.
Cellular Geographic Serving Areas
Defines geographic areas used by marketing agencies.
Standard Metropolitan Statistical Area
A technique used by standard telephone subscriber to access
the AMPS system.
A 34 bit binary code which in the U.S. represents the standard
10-digit telephone number.
A 34 bit binary code permanently assigned to each mobile unit.
Electronic Serial Number
Stands for Vehicle Identification Number.
An acronym for Network Interface Card.
A four bit code which indicates whether the terminal has
access to all 832 AMPS channel or only 666.
Station Class Mark (SCM)
A 15 bit binary code used by FCC to an operating company when
it issues it a license To provide AMPS
System Identifier (SID)
It is one of the three analog frequencies (5970 Hz, 6000 Hz,
or 6030 Hz) that helps mobile system distinguish one base station from a
neighboring base station.
Supervisory Audio Tone
One of four binary codes, also helps mobile system distinguish
one base station from a neighboring base station.
Digital Color Code (DCC)
One set of channels dedicated for exchanging control
information between mobile units and base stations.
Also termed as Voice channel, used for propagating actual
voice conversations or subscriber data.
Another name of control channels.
Setup or Paging Channel
Sometimes called as Camped.
A sequence of alternating 1s and 0s.
A unique sequence of 1s and 0s that enables the receiver to
instantly acquire synchronization.
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
It is used to indicate the current status of the reverse
It contains the following:
parameter overhead messages
action overhead messages
Typical mobile-unit control messages:
voice channel designation messages
Transmitted at a 10-kbps rate.
Control data includes:
Transmission of voice.
The entity of SS7 interoffice protocol that distinguishes the
physical components of the switching network.
A family of mobile or portable radio communications services
which provides services to the individuals and business and is integrated
with a variety of competing networks.
Differences in PCS and cellular telephone
Personal Communications System
Acronym for Personal Communications Network.
It is assigned to everyone which is stored the on the SS7
Personal Telephone Number
It determines where and how the call should be directed.
Artificial Intelligence Network
A database that stores information about the user, including
home subscription information and what supplementary services the user is
Home Location Register
A database that stores information pertaining to the identification
and type of equipment that exists in the mobile unit.
Equipment Identification Registry
It allows all calls to pass through the network to the
subscriber except for a minimal number of telephone numbers that can be
The PCS equivalent of caller ID.
All calls except those specified by the subscriber are
automatically forwarded to a forwarding destination without ringing the
No calls are allowed to pass through to the subscriber.
PCS operating in the 1900 MHz range.
Interference avoidance scheme which uses voice companding to
provide synthetic voice channel quieting.
A narrowband AMPS system that increased the capacity of the
AMPS system in large cellular market.
It is developed with the intent of supporting a higher user
density within a fixed bandwidth frequency spectrum.
United States Digital Cellular
Cellular telephone systems that use digital modulation.
Allows one mobile unit to use a channel at the same time by
further dividing transmissions within each cellular channel.
Time-division Multiple Accessing
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
Technique used that allows more mobile-unit subscribers to use
a system at virtually the same time within a given geographical area.
It stands for Electronics Industries Association and
Telecommunications Industry Association.
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.
It is often called North American Time Division Multiple
It was introduced to provide PSK rather than FSK on dedicated USDC
control channels to increase the control data rates and provide additional
specialized services such as paging and short messaging between private
mobile user groups.
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
Short Message Service
It was developed to provide a host of new features and
services, positioning itself in a competitive within the newer PCS systems.
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
It is used to transmit information from base stations to
specific mobile stations.
SMS point-to-point Paging and access response
It is dedicated to delivering pages and orders.
It transmit :
history count updates
secret data updates
Paging Channel (PCH)
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
It is used to deliver short point-to-point messages to a
specific mobile station.
It refers to : F-BCCH, E-BCCH and S-BCCH logical sub channels.
Broadcasts digital control channel structure parameters.
Fast Broadcasts Control channel
Carries less critical broadcast information than FBCCH
intended for mobile units.
Extended Broadcasts Control Channel
Individual mobile units. A logical channels used for sending
SMS Broadcasts Control Channel
Stands for Digital speech interpolation.
Carries digital voice information and consists of RDTC and
Digital Traffic Channel
It consists of an eight bit digital voice color code number
between 1 and 255 appended with four
Coded Digital Verification
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)
A special speech coder.
Vector sum exciter linear predictive (VSLP)
A special microprocessor that is implemented on the telephone
Digital Signal Processor
They are transmitted when a mobile unit begins operating in a
larger diameter cell.
An access method used with standard analog AMPS which use
frequency channelization approach to frequency spectrum management.
It allows users to differentiate from one another by a unique
code rather than a frequency or time assignment.
Code Division Multiple Accessing
Stands for Qualcom 9600bps Code-Excited Linear Predictive
The concept is to break the message into fixed sized blocks of
data with each block transmitted in sequence except on a different carrier.
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.
It is a study group which is sometimes referred to as
Pan-European cellular system. This is now known as the Global System for
Classification of GSM telephone services:
Groupe Special Mobile
All-digital data Network.
Integrated Services Digital Network
Sometimes known as radio subsystem, provides and manages radio
frequency transmission paths between mobile units and the mobile switching
Base Station Subsystem
It manages switching functions for the system and allows MSCs
to communicate with other telephone networks.
Network Switching Subsystem
The available forward and reverse frequency bands are
subdivided into 200 KHz wide voice channels.
Absolute Radio-Frequency Channel Numbers
It provides the vehicle for a new generation of wireless
telephone services called Personal Communications Satellite System (PCSS).
Mobile Satellite Systems
It uses low earth-orbit (LEO) and medium earth orbit and MEO
thar communicates directly with small, low-powered mobile telephone units.
key providers in PCSS market:
Mobile Satellite Communications (AMSC)
Personal Communications Satellite System
An international consortium owned by a host of prominent
companies, agencies and governments.
The largest commercial venture undertaken in the history of
A satellite based wireless personal communications network
designed to permit a wide range of mobile telephone services, including
voice, data, networking, facsimile and paging.
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
L-band subscriber-to-satellite voice links.
1.616 GHz to 1.6265 GHz
Ka-band gateway downlinks.
19.4 GHz to 19.6 GHz
Ka-band gateway uplinks
29.1 GHz to 29.3 GHz
23.18 GHz to 23.38 GHz