User's Manual

Menus and Parameters
4.2.6.5.8
erhead
associated with transmissions in the wireless medium. In a burst transmission
n
broadcasts/multicasts).
4.2.6.5.8.1
The Bur Option enables or disables the Burst Mode operation.
The
4.2.6.5.8.2 Burst Mode Time Interval
The Bu defines the burst size, which is the time in which
data frames are sent immediately without contending for the wireless medium.
The
4.2.6.5.9 Adaptive Modulation Algorithm (Multi Rate)
The Ad
transmitted data to the prevailing conditions of the applicable radio link. The
algorithm provides Access Units with simultaneous, adaptive support for multiple
Su
level d
Link q
switch
using t
any giv
he decisions made by the Adaptive Modulation Algorithm for the modulation
be used are based on multiple parameters, including information on
cision algorithm is performed
mission mechanism operates as follows:
modulation level selected by the Adaptive Modulation algorithm.
the frame will be retransmitted at the
e maximum number of retransmission
arameters:
Burst Mode
Burst mode provides an increased throughput by reducing the ov
the inter-frame spacing is reduced and unicast data frames are transmitted
without any contention period (burst mode is not activated oo
Burst Mode Option
st Mode
default is Enable.
rst Mode Time Interval
range is from 1 to 10 milliseconds. The default is 5 milliseconds.
aptive Modulation Algorithm enables adapting the modulation level of
bscriber Units at different modulation levels, as transmission’s modulation
ecisions are made separately for each associated SU.
uality fluctuates due to various environmental conditions. Dynamically
ing between the possible modulation levels increases the probability of
he maximum modulation level suitable for the current radio link quality at
en moment.
T
level to
received signal quality (SNR) that is received periodically from the destination
unit, the time that has passed since last transmission to the relevant unit, and
the recent history of successful and unsuccessful
transmissions/retransmissions. In the AU the de
separately for each SU.
The transmission/retrans
1 Each new frame (first transmission attempt) will be transmitted at a
2 If first transmission trial has failed,
same modulation level up to th
attempts defined by the Number of HW Retries parameter.
The Adaptive Modulation Parameters menu includes the following p
Operation and Administration
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