Red
MAX
™
Base Station
user manual
Doc. #70-00058-01-01-DRAFT
Proprietary Redline Communications © 2006
November
29,
2006
Page 102 of 106
Term
Acronym Definition
Orthogonal
Frequency
Division
Multiplexing
OFDM
Orthogonal frequency-division multiplexing (OFDM) is
a method of digital modulation in which a signal is split
into several narrowband channels at different
frequencies. The technology was first conceived in the
1960s and 1970s during research into minimizing
interference among channels near each other in
frequency.
In some respects, OFDM is similar to conventional
frequency-division multiplexing (FDM). The difference
lies in the way in which the signals are modulated and
demodulated. Priority is given to minimizing the
interference, or crosstalk, among the channels and
symbols comprising the data stream. Less importance
is placed on perfecting individual channels.
Packet
-
A bundle of data organized in a specific way for
transmission. The three principal elements of a packet
include the header, the text, and the trailer (error
detection and correction bits).
Packing
-
The act of combining multiple service data units
(SDU) from a higher layer into a single medium
access control protocol data unit MPDU.
Physical Layer
PHY
Provides for the transmission of data through a
communications channel by defining the electrical,
mechanical, and procedural specifications.
Physical slot
PS
A unit of time, dependent on the physical layer
specification, for allocating bandwidth. PS is
designated by 1 OFDM symbol.
PIR
-
Maximum Sustained Traffic Rate (see QoS)
Privacy key
Management
Protocol
PKM
A client/server model between base station and
subscriber that is used to secure distribution of keying
material.
Protocol Data
Unit
PDU
The data unit exchanged between peer entities of the
same protocol layer. On the downward direction, it is
the data unit generated for the next lower layer. On
the upward direction, it is the data unit received from
the previous lower layer. MPDU is the data unit
exchanged between peer 802.16 MAC entities. One
MPDU is formed from one or more SDUs.
Provisioned
Service Flow
-
A Service Flow that has been provisioned as part of
the Registration process, but has not yet been
activated or admitted. It may still require an
authorization exchange with a policy module or
external policy server prior to admission.