frequency planning 20080514 a microwave huawei
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8/9/2019 Frequency Planning 20080514 A Microwave Huawei
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June 22, 2006
HUAWEI TECHNOLOGIES Co., Ltd.
www.huawei.com
HUAWEI Confdential
Secuit! Le"el# INTE$NAL
Microwave NetworkPlanning and Design--Frequency Planning
Microwave Business Dept.
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
Microwave Frequency Planning
Purpose of frequency planning:
Make reasonable use of the frequency resources
so that the new microwave links and existing ones
do not interfere with each other and the system
availability of the microwave network can be
ensured. In the process of planning for the
microwave network, appropriate frequency bands
and channels should be selected and interference
avoidance should also be taken into account.
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
Microwave frequency bands suggested by I!"#$ for common use%Frequency
Band
4 GHz L6 GHz U6 GHz GHz ! GHz "" GHz "# GHz "$ GHz "! GHz %# GHz %6 GHz #! GHz
&ange #'6(4'% $')(6'4 6'4('" '"(' '(!'$ "*'(""' "%'("#'% "4'$("$'# "'(")' %"'"(%#'6 %4'$(%6'$ #'*(#)'$
Microwave Frequency Planning
+ivision of ,icrowave frequency -ands:
&' M' (' )(' "(' *(' +('
Microwave
"* ., " ., "** , "* , " , "* c, " c, " ,,
f #* .Hz #** .Hz # MHz #* MHz #** MHz # GHz #* GHz #** GHz
Infrared
rays
)isible
light
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
Microwave Frequency PlanningPrinciples of selec/ing proper frequency -ands:
-. *elect proper frequency bands according to the frequency resources licenses/ owned by
the carriers and the stipulations of local radio management committees.
2. *elect proper frequency bands according to the characteristics of the designed networks
and routes. 'or example, high#frequency bands are generally used for mobile networks
and M01s because quite a few channels available at high#frequency bands.
. *elect proper frequency bands according to their characteristics.
&ow#frequency bands &345"345645745--4/ are suitable for long#distance links and
high#frequency bands -45-845-745245234574/ are suitable for short#distance
links.
9ue to the limited number of channels existing at low#frequency bands, interference
tends to arise in the long#distance transmission.
(igh#frequency bands are suitable for high#speed data transmission and interference
sustainable because there are many channels with broad bandwidth.
(igh#frequency antennas feature high gains. :ompared with low#frequency bands, high#
frequency bands require small clearance. !owers with these antennas properly used can
be lower than others.
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
Microwave Frequency Planning
0llus/ra/ion of /1e selec/ion of ,icrowave frequency -ands:
782 -; 2;- ; ; 8;
-.8 2.8
&015P:*
&ong#distancebackbone networks
0rea, local, and edge networks
2
7
Mbit5s
-;
-88
Mbit5s
27
-;-88
Mbit5s
. -- 4(<
4(
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Microwave Frequency Planning
Figure " for configuring ,icrowave radio frequency c1annels:
:hannel number
'requency
'
'-'2
'o
- 2 n -= n=
&ower half band "pper half band
:enter frequency
'o% center frequency
2=
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
Microwave Frequency Planning
Figure % for configuring ,icrowave radio frequency c1annels:
+ach channel consists of a pair of transmission and receiving frequencies.
!x
$x
!x
$x
:hannel :hannel
-
-=
n
n=
-
-=
n
n=
(igh site &ow site
!he site which the receiving frequency higher than
transmitting frequency is called a high site.
!he site which the receiving frequency is lower than
the transmitting frequency is called a low site.
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
Microwave Frequency Planning
Principles of selec/ing proper -andwid/1 of ,icrowave c1annels:
!he bandwidth of a microwave channel is decided by the signal rate and radio
modulation scheme.
!he most commonly used ways are the quadrature phase shift keying ?P*@/ and
quadrature amplitude modulation ?0M/.
2 x +- requires .8 M(< ?P*@/ x +- requires 6 M(A ?P*@/ 7 x +- requires - M(< ?P*@/ -3 x +- requires 27 M(< ?P*@/ *!M#- requires 27 M(< -27?0M/
!he more advanced modulation is, the smaller the bandwidth is required.
!he -3+- signal subBect to ?P*@ requires the same bandwidth 27 M(
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
Microwave Frequency PlanningPrinciples of selec/ing proper ,icrowave c1annels:
-. !ry not to select the special frequency resources licensed/ used by other carriers even if
these frequency bands are not used in some areas in case they may be used in the future/.
2. If the planned microwave link features the same routing or parallel routing as another
microwave link, it is recommended that the frequency band5channels different from those of
the existing link are used. 0 different polari
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
Microwave Frequency Planning
89a,ple for /1e ,icrowave frequency planning:
In frequency planning, reusing of frequency resources should be taken
into account, the internal and external interference should be avoided,and the link quality should be enhanced.
Polari
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
Microwave Frequency Planning5wo(frequency sys/e, and quadruple(frequency sys/e, used in ,icrowave frequency planning:
'or the -D- system or 2D; system of the frequency diversity, the use of the two#
frequency system can save the frequency resources, while the use of the quadruple#
frequency system can decrease the internal and external interference and enhance the
link quality. Chether to select the two#frequency system or the quadruple#frequency
system depends on the interference within the planned microwave network system and
the mutual interference between the microwave links to be established and the linksexisting in the system.
:ase -% Chen the link to be
established interleaves with an
existing one, the two#frequency
system can be used for the
former provided the same
system is used for the existing
link, and a different channel
should be selected in this case.89is/ing lin7
Lin7 /o -e established
"6 #
"6 # %6 4
%6 4
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
Microwave Frequency Planning5wo(frequency sys/e, and quadruple(frequency sys/e, used in ,icrowave frequency planning:
:ase 2% Chen the link to be
established interleaves with an
existing one, t(e *uadu-le)e*uenc! '!'te can +eu'ed )o t(e )oe-o"ided t(e 'ae '!'tei' u'ed )o t(e e/i'tin& lin.In t(i' ca'e, t(enei&(+oin& lin' '(ould(a"e di1eent c(annel'.
89is/ing lin7
Lin7 /o -e es/a-lis1ed"6 #
%6 4 %6 4
"6 #
:ase % Chen the link to be
established has a branch,the quadruple#frequency
system should also be used
for this branch.
"6 #
%4
"6 #
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
Microwave Frequency Planning5wo(frequency sys/e, and quadruple(frequency sys/e, used in ,icrowave frequency
planning:
:ase % Chen the link to be established
forms a loop#line with quite small angles,
the quadruple#frequency system should
be selected.
"6 #
%6 4 %6 4
:ase 8% Chen the routing deflection angles
are too great, but the angles of &a and &b
are quite small, for example, smaller than -8
degrees, comparatively great overreach
interference may occur if the two#frequency
system is selected for *ite 0 and *ite 9.
!herefore, the quadruple#frequency system
should also be used in this case.
"6 #
"6 # "#<B
=
+
%4La
L-
:ase 3% !he quadruple#frequency system should also be selected in such circumstances as the
front#back ratio difference of the antenna is smaller than 3;dE, the *C$*tanding Cave $atio/ of
the antenna feeder is large, and the equipment has weak immunity to interference.
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
Microwave Frequency Planning
2elec/ion of proper frequency diversi/y c1annels:
Chen the microwave link is designed to adopt the frequency diversity protection,
attention should be paid to the selection of channel spacing between the master
channel and diversity channel. !he formula to calculate the improvement in the
frequency diversity is as follows%
d/1080210/
f f I
CFM
FD
•∆•=
where
FD I % frequency diversity improvement
f ∆ % frequency spacing between the master channel and diversity channel
f % $adio center frequency
CFM % flat fade margin
d % transmission section length
'rom the formula, we can find that the improvement in the frequency diversity is proportional to the
channel spacing. 4enerally, the channel spacing should be at least 2 times of the radio frequency
bandwidth. 'or a greater improvement in the diversity, the channel spacing should be as large as
possible.
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
=ase 2/udy for Microwave Frequency Planning
:ase study purpose% to be familiar with the preceding rules for microwave frequency planning and apply them to practice.
ProBect area% Mauritius in the +astern (emisphere and *outhern (emisphere
$equirement of the longitude
and latitude of the site% auitiu'
'requency resource% assigned by the user, 64527M% 2 chsF 7456M% chs
:ontents of planning%
:hannel planning
(igh and low sites configuration
:onfiguration of the polarie/wor7 frequency planning in Mauri/ius:
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
=ase 2/udy for Microwave Frequency Planning
&egend%
=o,ple/e /1e rou/ing and capaci/y planning -y referring /o /1e rig1/ ,ap:
25M("
!8"
48"
1ew relay stations
*ervice hub
E!*
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
=ase 2/udy for Microwave Frequency Planning
Proper channels of different bandwidths should be selected according to the capacity of the microwave link and frequency resource
the user owns.
'requency resource owned by the user%
=1annel selec/ion ":
:hannel 1o. 'requency :hannel 1o. 'requency
-h 63-; -l 62
h 6333 l 6>7
64% 6.#6.6F number of channels% 2F channel spacing% 27 M(
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
=ase 2/udy for Microwave Frequency Planning
Proper channels of different bandwidths should be selected according to the capacity of the microwave link and frequency
resource the user owns.
'requency resource owned by the user%
=1annel selec/ion #:
74% 6.>#7.F number of channels% F channel spacing% 6 M(<
:hannel 1o. 'requency :hannel 1o. 'requency
-h 7-67 -l 6>-2
2h 7-78 2l 6>->
h 7->2 l 6>23h 7->> l 6>
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
=ase 2/udy for Microwave Frequency Planning
Proper channels of different bandwidths should be selected according to the capacity
of the microwave link and frequency resource the user owns.
!he following channels are selected according to the capacity of the link%
=1annel selec/ion 4:
'or *!M#-, select f- and f channels 628#6628/ with 27 M(< bandwidth.
'or 7+- P9(, select f- and f2 channels 6>;;#7;;/ with - M(< bandwidth.
'or +- P9(, select f-, f2, f, and f channels 6>;;#7;;/ with 6M(< bandwidth.
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
=ase 2/udy for Microwave Frequency Planning
+xample for frequency planning in Pathloss%
Frequency planning in Pa/1loss:
-. 0ccess the P&.; program.
2. &og in to the network module.
. Gpen the completed routing file.
. !ake the link between *ite 8 and *ite 2- for instance. *et the :( parameters
after setting the parameters for $adio and 0ntennas.
8. :lick =H. !he 5? =1annels dialog box is displayed, as shown in the next page.
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
=ase 2/udy for Microwave Frequency Planning
:lick =H. !he 5?
=1annels dialog box
is displayed, as
shown in the figure
on the right side %
Frequency planning in Pa/1loss:
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
=ase 2/udy for Microwave Frequency Planning
:lick Loo7up. In
the File dialog box
that is displayed,
click ;pen and
select the
corresponding
frequency planning
file from Freqplan,
as shown in the
figure on the right
side.
Frequency planning in Pa/1loss:
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
=ase 2/udy for Microwave Frequency Planning
*9( adopts the hotbackup system. *elect
f- channel with 6 4(<
bandwidth as required,
and then select the
proper frequency for
use, site - as the high
site, and the vertical
polari
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
=ase 2/udy for Microwave Frequency Planning
0ccording to the
two#frequency
system, the
frequency planning
for the *9(
backbone ring is
completed, as
shown in the figureon the right side%
Frequency planning in Pa/1loss:
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
=ase 2/udy for Microwave Frequency Planning
0ccording to the two#frequency
system, the frequency planning
for the *9( backbone ring is
completed, as shown in the
figure on the right side.
1ote that a site *ite 8/ in the
ring has both high and low
stations due to the odd number
of the E!*s. In frequency
planning processes, thisshould be avoided.
Frequency planning in Pa/1loss:
l 6
, > 7 ( 6 3 3 3 h
l 6 , > 7 ) 6 3 3 3 h
- h 6 3 -
; ) 6 ,
, 2 - l
h 6 3 3 3 (
6 , > 7 l
- l 6
, , 2 )
6 3 - ;
- h
- h 6 3 - ; ( 6 , , 2 - l
h 6 3 3 3 ) 6 , > 7 l
*ite 852
*ite 2-5-
*ite 285-
*ite 5-
*ite 85-
099-
0992
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
=ase 2/udy for Microwave Frequency Planning
*tatistics about the
frequency planning
for the *9(
backbone ring%
Frequency planning in Pa/1loss:
2i/e >a,e " 2i/e >a,e %Frequency@Polariza/ion
Mode
*ite 8 high/ *ite 2- low/ "@
*ite 2- low/ *ite 8 high/ #@
*ite 8 high/ *ite low/ "@H
*ite low/ *ite 28 high/ #@H
*ite 28 high/ 099 2 low/ "@
099 2 low/ 099 - high/ #@
099 - high/ *ite 8 low/ #@H
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
=ase 2/udy for Microwave Frequency Planning
!ake *ite 2- for
instance. In Pathloss,
implement the
frequency planning forthe link of 7+-. *elect
the -D- hot backup
mode, f- channel in 7
4(< bandwidth, and
vertical polari
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
=ase 2/udy for Microwave Frequency Planning
!ake *ite 2- for
instance. !he result
of the frequency
planning for the link
of +- is shown in
the figure on the
right side%
Frequency planning in Pa/1loss:
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
=ase 2/udy for Microwave Frequency Planning
!he 2#hop *9( link, -#hop 7+- link,
and #hop +- link converge at *ite
2-. 0s +- has quite a few links, try
to select different channels in the
direction of 7+- links to reduce the
interference. In this case, f-, f, andf channels with 7 4(< bandwidth
are selected and a different
polaria,es "
2i/e
>a,es %
8quip,en/ Planned
Frequency
5 &
*ite 2-
low/
*ite 7
high/
+- ( 6> !"))
*ite 2-
low/
*ite 7
high/
+- ) 6>23 !")%
*ite 2-
low/
*ite >
high/
+- -( 6>-2 !"!
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
=ase 2/udy for Microwave Frequency Planning
!he result of the
frequency
planning for *ite
2- is shown in
the figure on the
right side%
Frequency planning in Pa/1loss:
Site 5
Site 24
Site 5 4 ( 7 6
4 0 8 7 9
9 2
4 l
l 7 9 : 3 8 7 6 6 6
(
( 3 4 : 2 8 7 : 2 6
l
4 (
3 4 7 3 8
7 : 4 2
4 l 3 E 4
.
9 ; S <
4
( 3 4 7 3 H
7
: 4 2 4 l
9 (
3 4 : :
H
7 : 6 6 9
l
Site3
Site 3
Site :
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
=ase 2/udy for Microwave Frequency Planning
:omplete all frequency planning for the microwave network according to the relevant
principles and output the design result. !he frequency configuration in the software
will be used for the future interference analysis.
Frequency planning in Pa/1loss:
Out-ut o)*uenc! -lanni
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an youwww.huawei.com
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