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Chapter 4 - Operation and Administration
Tx Power
The Tx Power parameter defines the power level of the transmitted signal at
the antenna port of the AU-ODU.
The range is from 13 to 28 dBm using a 0.25 dBm resolution.
The default is 28 dBm.
4.8.4.3.3
Multirate Parameters
BreezeMAX employs a multirate
scheme and Forward Error Correction (FEC) coding to actual link conditions. The
orithm is managed by the AU/ µBS
alg
received from the served SUs, and optimal values are calculated separately for the
upl
ink and downlink for ea
requirements. MAP messages transmitted to the SUs include information on the
upl
ink rate that should be used by e
The
Basic Rate is the minimum rate
downlin
k, this is also the rate to be
Broadcasts and multicasts mess
mechani
reci
pients will receive them properly. In
broadc
asts are sent to multiple recipient
it is
preferable to use a relatively low ra
the probabil
will re
ceive them properly.
In the uplink, this is the rate to be used by SUs for non-scheduled transmissions,
suc
h as during the conte
The Basic Rate is also the initia
that joins the cell when the Multirate algorithm is enabled.
Wh
en the Multirate algorithm is disab
will continue using the last uplink and downlink rates selected by the Multirate
alg
orithm. The Set Rates option in th
becomes available only when the Multirate algorithm is disabled in the AU/ µBST,
ena
bles setting the Uplink Current R
the values listed in Table 4-5.
The multirate algorithm chooses dynamically between 8 rates. These are also the
rates that can be configured fo
124
ch SU, taking into account also the applicable QoS
sm cannot be used an
ity of errors and increasing th
ntion period.
algorithm to dynamically adapt the modulation
T taking into account also information
ach SU for its next transmission.
to be used by the Multirate algorithm. In the
used for broadcasts and multicasts.
ages are not acknowledged, so that the ARQ
d there is no way to guarantee that all intended
addition, AU's/ µBST's multicasts and
s with different link qualities. Therefore,
te for these transmissions, thus reducing
e likelihood that all intended recipients
l rate to be used by the algorithm for each new SU
led, communication with connected SUs
e SU (see
Set Rates
ate and the Downlink Current Rate to any of
r the Base Rate and Default Rate parameters.
on page 143), which
BreezeMAX System Manual
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