FinM
Deployment
Guide
Release
4.5.10
4
‐
18
Basic
Situation
Configuring
the
Radio
Network
•
If
your
system
uses
more
than
3
frequencies,
this
method
of
interference
mitigation
is
not
needed.
4.5.1
Basic
Situation
The
three
frequencies
are
used
on
the
TBSs
in
a
staggered
fashion:
TBS1
uses
F1,
TBS2
uses
F2,
TBS3
uses
F3.
The
pattern
is
then
repeated:
TBS4
has
again
F1,
TBS5
has
F2,
TBS6
has
F3,
and
so
on.
We
assume
that
the
nominal
distance
between
each
TBS
is
at
least
500m
(below
ground;
above
ground
this
value
can
be
as
large
as
2000m).
See
.
Figure
4
‐
10:
Co
‐
Channel
Neighbors
At
a
given
moment,
a
rail
car
(with
TMU1)
is
synchronized
with
TBS1,
and
using
frequency
F1.
At
this
same
moment,
this
rail
car
is
about
1500
meters
away
from
TBS4,
which
is
also
using
F1
1
.
Any
signal
that
TMU1
receives
from
TBS4
at
this
point
is
considered
interference.
If
the
signal
from
TBS4
is
strong
enough,
the
interference
can
harm
the
throughput,
and
needs
to
be
mitigated.
This
situation
continues
throughout
the
line
‐
TBS7
can
interfere
with
TBS4/TMU4,
and
in
turn
TBS4
can
interfere
with
TBS7/TMU7.
TBS7
can
further
interfere
with
TBS10,
TBS10
can
interfere
with
TBS7
and
TBS13,
and
so
on
down
the
line.
The
two
units
that
can
interfere
with
each
other
are
called
“co
‐
channel
neighbors”.
4.5.2
Necessary
Pre
‐
Conditions
If
the
“Co
‐
Channel
Neighbor
Interference
Mitigation”
option
is
configured,
it
will
be
activated
or
de
‐
activated
automatically
according
to
the
conditions
described
below.
Note
that
the
activation
conditions
and
de
‐
activation
conditions
are
not
exactly
symmetrical.
1. If
fewer
than
3
frequencies
are
used,
the
values
would
be
1000m
for
two
and
500m
for
one
frequency.
TBS1
TBS4
TBS7
TBS2
TBS3
TBS5
TBS6
TMU1
TMU4
TMU7
500m
500m
500m
500m
500m
500m
co
‐
channel
neighbors
co
‐
channel
neighbors
Содержание Transportation FiberinMotion
Страница 1: ...DEPLOYMENT GUIDE TRANSPORTATION FIBERINMOTION BROADBAND TRAIN TO GROUND COMMUNICATION Release 4 5 10...
Страница 5: ...FinM Deployment Guide Release 4 5 10 iv...
Страница 51: ...FinM Deployment Guide Release 4 5 10 2 38 TMU Mounting Site Installation Figure 2 65 TMU PoE drawer contents...
Страница 122: ...FinM Deployment Guide Release 4 5 10 F 1...