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Patent 2087542 Summary

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(12) Patent Application: (11) CA 2087542
(54) English Title: CELL-TYPE TELEPHONE SYSTEM WITH EXTENDED CELL
(54) French Title: SYSTEME TELEPHONIQUE CELLULAIRE A CELLULES ELARGIES
Status: Deemed Abandoned and Beyond the Period of Reinstatement - Pending Response to Notice of Disregarded Communication
Bibliographic Data
(51) International Patent Classification (IPC):
  • H04B 7/26 (2006.01)
  • H04W 84/14 (2009.01)
(72) Inventors :
  • KOROWAJCZUK, LEONHARD (Brazil)
(73) Owners :
  • ALCATEL TELECOMUNICACOES S.A.
(71) Applicants :
  • ALCATEL TELECOMUNICACOES S.A. (Brazil)
(74) Agent: SWABEY OGILVY RENAULT
(74) Associate agent:
(45) Issued:
(86) PCT Filing Date: 1992-05-19
(87) Open to Public Inspection: 1992-11-21
Availability of licence: N/A
Dedicated to the Public: N/A
(25) Language of filing: English

Patent Cooperation Treaty (PCT): Yes
(86) PCT Filing Number: PCT/BR1992/000005
(87) International Publication Number: WO 1992021215
(85) National Entry: 1993-01-18

(30) Application Priority Data:
Application No. Country/Territory Date
PI 9102145 (Brazil) 1991-05-20

Abstracts

English Abstract

2087542 9221215 PCTABS00017
A cell-type telephone system having an extended cell,
particularly designed to be used in rural areas is provided, comprising a
commutation and control unit (CCC) connected to the national
telephone network (RNT) and in communication with several cells, each
cell being provided with a receiving and retransmitting base radio
station (ERB) comprised of a tower and an antenna array, said
tower being preferably of great size and constructed on an elevated
site and having high power antennas in order to cover a great
area, and a plurality of fixed terminal stations (ETF), each said
fixed terminal station (ETF) being provided with a high detection
power directional antenna coupled to a transreceiver to make out
a subscriber's terminal.


Claims

Note: Claims are shown in the official language in which they were submitted.


WO 92/21215 12 PCT/BR92/00005
CLAIMS
1. A cell-type telephone system having an
extended cell, particularly designed to be used in rural
areas, characterized by comprising:
a commutation and control unit connected to the
national telephone network and in communication with several
cells;
a receiving and retransmitting base radio station
in each cell, said base radio station being comprised of a
tower and an antenna array, said tower being preferably of
great size and constructed on an elevated site and having
high power antennas in order to cover a great area; and
a plurality of fixed terminal stations
distributed within the range of each said base radio station,
each fixed terminal station being provided with a high
detection power antenna coupled to the same which is directed
towards the base radio station.
2. A cell-type telephone system according to
claim 1, wherein each base radio station is connected to the
commutation and control unit by means of a four wire analog
or digital channel, the communication between same is by
radiofrequency, PCM beam or fiber optics.
3. A cell-type telephone system according to
claim 1, wherein each fixed terminal station comprises a low
power transreceiver coupled to the directional antenna,
making out a fixed subscriber's terminal.
4. A cell-type telephone system according to
claim 1, wherein the base radio stations communicate with
fixed terminal stations through radiofrequency channels which
comprise control and audio channels.
5. A cell-type telephone system according to
claim 1, wherein the base radio station interfaces local
subscribers with one another and/or interface local
subscribers with national telephone network subscribers.
6. A cell-type telephone system according to
claim 1, wherein the base radio station communicates with
fixed terminal stations through radiofrequency channels which
use standard protocols for sending and receiving control

WO 92/21215 13 PCT/BR92/00005
channels and audio signals.
7. A cell-type telephone system according to
claim 6, wherein said communication between the base radio
station and fixed terminal stations is provided by frequency
modulation of a radio system operating within the 800 MHz
range.
8. A cell-type telephone system according to
claim 6, wherein each base radio station comprises at least
two racks interconnected to omnidirectional antennas.
9. A cell-type telephone system according to
claim 8, wherein said antennas are installed at a suitable
height sufficient to allow for a coverage having a radius of
approximately 60 km around the base radio station.
10. A cell-type telephone system according to
claim 1, wherein the commutation and control unit is
comprised of a main control unit and a switching unit, the
former designed to interface the operator with the system and
the latter designed to control the processing of calls and
all connection and disconnection phases of calls.

Description

Note: Descriptions are shown in the official language in which they were submitted.


WO ~/21215 2 ~ 8 7 ~ ~ 2
"CELL-TYPE TELEP~ONE SYSTE~ WITK rXTENDED CELL"
Background of the Invention
Field of the lnvention
The present Inventian gener~lly relates ro cell-
type tclepnonc systems ~nd. mor~ spcclfically, to ~ cell-type
~ lcphone system having an ex-en~e~ cell which i~
particul~rly suita~le for use in rural areas.
~cscription of thc Prior Ar-
Generally, the pro~L~ion of an efficient
telophon~ system for ~ural areas poses a numoer of problemc,
~mong whicn are :
(1) low papula~ian ~onsity due ~o natural
disperslon of peoplo;
~ ii) great ~is~ances -o be cove~e~ wnic~
practically ~r~ng a~out expenslvn ~mplemencae~on of a ca~le
telephone network servin~ all prospectlve use~s; and
~ iil) d~fficuity ~ stretching and maincain~n~
telephane netwar~ ca~les. ~n vLew of ~eographlc profiles.
ln vlew ~f s~ch difriculCies e~ere ~s. Lnter
al~a, a greae een~ency towar~s e~e ~se of ~adioeel pn~ny fo~
the supply of telecommunicat~on eo ~ural areas.
Tlplcally, a ~u~al ~a~i~telephone ¢y~Cem such 3
the one prcsently ln ~se comp~ses interconnece~n~ small
v111ages ar settlemene~ ~nrougn ra~ioeelepnony an~. ae
g1ven s1te, conne~eln~ 3~ a~ioeelephone sy~eem eo ene
national telecommunicatLcn necwo~.
Th~s solutlon~ ~owe~e~, apare from noc ~eten~n~
all prospectlv~ u~e~ lso ?~esene. ~^rlou~ p~e~Lc~mene~
malnly rel~eed tO e~e nl~nly e~pen~Lve ~nsCallseLon of ene
~0 whole lnfra~truccu~e ~a~L~e~ ve~y ~m~ll v~L~a~ c~
seetlement and tne compLec~ t ~o~ of p~ cy ~n tne
communlcation, ~nce anyone m~ inC-~epG B ~ven c~ll Lf ne
ls provlde~ wlcn a ~u~e~}e ^~uLpm~ne.
Alm~ng tO ~ol~e ~ ove-~sc~s3e~ p~o~lem~ an~
~5 pro~l~e ~n efficienc eelecommun~c3t~0n ~ysCem for r~ral
areas, It was proposed eo use a cel1~eype eelephone ~yster.:.
Br~efly, a c~lL-Cyp~ CeL~pnone s~em ~g 3
raalotelep~one ~vstem in wnicn Ch~ dvsil~ale f.~3unnc~ ~an~

WO92/21215 2 ~ 8 ~ 2 PCTIBR92/~WK~
;. ''' ~
is divided into ~roups of frecucinc-es diisignated as cells,
which ce~ls are geographically distrisu~e~ in such a way that
groups of frequencies from twa adj~cent cells always differ
from each othcir in ordcir ~o -l_minate any possible
interference in the communication.
Similarly, the f-ci~uonc~es in a given group of
frequencies are only rep-~~ed when ~:ne distancci ~etween Che
cells is enou~h t~:o assure t'nat :i~.ere ~ no morci be any
interferonce betwecin such f-~i~uenc.~ic in a c~ill and ~-te same
froquencles used in anothor ^~
Sincci oV~ t~ it~ Wi'i~''i a ~,_'i-i-, rj-"'i?
of frequencies, it is p~ssi~ile tCi perform or conduc~ a
cer~ain numcer ~f simul'ai-ie3u~ c~-r~ri-,a~~3ns. Yowevci~, a~ -`ho
areas coverod ~y each cei; ".~ sen~ differen~ .e!e?nono
trafflc loads, the dimensian cif ChQ cslls may chan3e in
accordance wlth the fluctuat~on of said telephone t~affic
load. In other words, dependin~ on ~he traffic loa~. c~e si~e
of the cell may have a radius ~etweon approximatsly l and
km ~one and five kilomeeers~.
Thou~ the smallest siz~ of the cell is limiced
by the presently avsila~le ~oc;nnot~gy to a r3dlus of
approx~mately ' km ~one ~ meter`l. since ~elow s~c~ lim~t
enere may arl3e lntsrfsrenoo pro~lnms whicn can no~ ~e ~olve~
w~thi~ eh~ g~oup of f~e~n_ios ~o~. th~ hi3h~C'. ~ of ~n~
cell now depen~s on th~ usor'~ ro~oiv~r dee~etiQn ~pa_i r~,
ene ~ntènn~ of wn~ch of~ n ~ee~en~ low ~o~oc~l~n power.
Thus, the aver~e size of c~Ll~ n e~ pr~onel~ ~n~wn ~
type telepnone syst~ms incorpor~e~ i w~ehin ~ ^~n~e of S
to 15 ~m ( flve to f~fe^en '~iomn~er-~.
~0 T~p~ o~ lL-~.y~n ~ nn
!~y9tem compr~3es:
~ mm~ n~ n.
c~nne~t~ th~o~h ~a~ n~ n~ ph~ n~ ~W~ n~
Ln commun~cation w~e~ .~evoJr~l e~o11~7 a~ io wa~os;
~5 ~ reCelv~n~ ~n`~ reGransmiccin~ o~e radio
~e~tion (ERB~ ~n e~èry cel~ m~sing a ~,~wor an~ an
antenna array: and
(lLil a pll~L~ L~ m~ n-C

W092/21215 3 2 ~ 8 7 ~ ~ 2 PCT/BR92/nWK~
O
~rovided with low detection power ~ntennas and able to
establish radiofrequency communicatian with every b~se r~dio
st~tion r~ferred to in the precedin~ paragrapn.
In view of tho ~ov~-discussed problema- related
to traffic load, cell siz_ and interferenca between
f~e~uencies, con~ention~l ce~l-ty~e telephone sys~ems. in
their ~se r~dio stationC. use l~w power antennas ~ssemsla~
on rel~tiveiy low towers prefer3~ly conatructod on not ~oo
elevated sites, in order o avai i a_ much as pOSa~bl any
interference ~etween the fro~uenc ~a of each grou~.
Summary of ~he Inven~l~r.
Thus, there is ~ need to provide an efficieQ~
telephona system for rur3l ~rO~ ;-. c-. i. one af ~~.e e~e-~C
of the present invention.
Anaeher o~Jac ~f ~he ?~esent Lnvencion is tne
provlsion of such an efficient tolep~one system Sor rural
areas whlch may 3erve all prospec~iva users.
An addition~l o~ec~ of the p~esent inveneion is
the provlsion of such an efficien~ radiotelephone syseem for
20 ru~al ~ress wnlcn doec not p~es~nt the a~ovo ~iscussed
pro~lems relsted to hi~hlv expensive inseall~on ~n~
difflcult ca~le seretchin3 ~nd ma~n~enanca.
Stlll anot~e~ o~ece of tne presenc invention is
tne prov1s1on of such ~ tolophono Cystem for ~u~al ~n3s
25 wnicn does not present er~ ovo-~iscusse~ pt~o~lams ~elato~
to expen~l~^ lmplemenc~c~on of infra3truceuro for
conventlon~l ~ural radioeelep~ony.
One addieional o~ece oC Cha inven~lon is ehe
pro~lslon of suc~ a t~lepnone ~y~e m for rural areas whLcn
does noe pre~ene en~ ~a~ u~e~ ~o~lem~ rel~ee~ eo 1~CK
of prlv~cy ln the communLc~eLon.
Accor~ln~ eo 5~e preS~Qe ~ nveneion, ;a~ accs
are fulfllled Gv tn~ pra~ L~n oC a call-eypa ra~io-~lep~one
syscem p~rc~cularly ~e~inei ~ ~a t~ed in rtl~al areag,
~5 cnaracterlza~ ~y compr~in~ a a~m~taeion an~ conerQl unit
connected to tne natLan~l ~elaonone netwoF~ an~ in
communlcatlon wltn ~evaral caLl~: a r a ~v~ng and
retran~mittin~ ba~e radi~ ~t~e:~n n e~er~ nll. aa~d ~3~a

W092/2l215 ~ 4 PcT/BR9~WKK
~, . . . ..
20%75g2 ~
radio station being comprisea o, ~ ~ower and an antenna
array, said tower being pr~f~ra~ly a large one and
constructed on an elova~e~ site an~ provided with high power
antennas in ordar to cover 3 gre~r ~rea; and a plurality of
fixed tarminal stations distribut-d wl:nin the reach of eacA
a~ove-m~ntioned ~ase r~dio staeia~, each fixed torminal
station ~eing provided with 3 ;~igh deteceion power
directional antenn3 coupl~td ~s sama ~r.ich is ~irecse~ towards
said baset radio station.
According to ~ha pre~n- invention, the base
radio s~3tion 3ntann~ powa- nc~a3_ct, ~heir ins~a.la~io., on
an elevated site and tha lncraase in rhe detecrion car,acity
of fixed termir,al s;atior., wn.e~. 3~a row ccuple~ ~o a ;n.~h
det~ctlon power ~irac~iorai an~-nna -~hi_h is ~irnc~e~ s~wa~C
lS t~e ~ase radio station, maka ,- p~ssi~le to increasa ehe si~ct
of each individual cell to a ra~ius of approxim~tnly 60 km
(slxty kilometers~ on a fla- surfaca, pracrically
qua~ruplicating the radius of ehe iarg~st cells in cnll-type
ra~lotelephone syscems of Che prio~ are.
Thus, ~y inve~t~ng the ~asic princlplas ~f call-
type ra~lotelephone syseems of e~e prior art, ~.~o si~a of
each cell may ~e extaertde~ C~ ~ne naCu~3L ga~gr~ohical
~oundarles wiehout po~in~ any inc_r fnranc_ pro~lnm ~aeween
groups of fr~aqu~ncies of ewo ~ a~ar.~
Addleionally an~ ^anerar~ t.o wh~t. ~ r~ln~ ~.n
conventlonal c~ typ~ ra~iotai~aphona ~y~tAmS~ th~a ~as~a -~io
~e~eion aneenna power incr~sa ~o~s not ~mply 3ny
interferenc~ pro~lem, sLnce en~ e 3n~ iis~ Q~on of
cells ln addiCion ea tne low ~ p~or.~ ~r~fri~ loa~ norm~lly
oG~erve~ in rural ~re~3 el~m~na-e ~.n~s ~in~ ef ~ro~ n~~,
~rlef Descrlption o~ Dr~win~s
Tne pr^~ent ~n~n-ior. wi~ n~ hara n
after in Rre~ter ~eea~} wie~ r~rerence ~ ~he non L`~ ve
em~odiment ehercof ~h~wn ir. ~.h~ ~eeached ~r~ n~ ~s ~n
ex~mple, in wn~cn :
Figure L ls ~ sc~am~ r~?r~en~.~e~n ~f ~ ~oll-
type radlotelepnone ~ystam ~c_i~r~i.n~ t~ eh~ prosen~ nvanel3n
snOwing a central~o~ conf i~r~e~?.~ n~

WO92~21215 5 2 ~ 8 7 ~ 4 2 PCT/B W2/~N~
. .. ..
Figure 2 is ~ schem~ c r~rasentation of a cell-
type radiotelephone system accordin~ eo the present invention
showing ~ decentr31ized confi~ur~tion.
~escription of the Prefarr~d ~mbodi~ent
With referenco now more particularly to the
dr~win~s, 3 c~ typ~ r~dio~eleonano system havin~ an
extended cell ~cco~din~ eo the presen~ invention is shown in
Figures 1 ~nd 2, The syse m comprises, basically,
commutation and control uni~ CC~. ~ ?lurality of ~ase r3dio
qtations E~B and a plurality of fixed cerminal stations ETF.
The commuta~ic-. ~n~ .o ~ni~ C~C ic a ii~ ~31
electronic commutation e~uipmen~ which uses ~istributed
processing and stored pra~r3m c3n~~0 ape~ati~nal eechni~ue-c
to control ~as~ radio s,ations _~3 and fix~d :erminai
stàtlons ETF in or~er to provi~e an efficient communication
system.
Prsfera~ly, t~e cammueaelon and control unlt CCC
19 of ~ type known in e~e seate a~ tne art whic~ is a~le Co
commutàte volce and daea c~rcuitry ~nd perform analag~ itsl
~A/~) and dlgltal-analog (D/A~ conversions and tnus it shall
not be descrl~ed ln details ~elaw. T~e ob~ectiv_ of tne
commutation and control unie CC~ ~ 3 eo provi~e an interface
~etween ~ase radio stat~ons E~8 in t~e ce;l-type
ra~lotelephone 3yseem nav~n~ an axc~n~e~ cell ~cc3r~n~ eo
the present invenelon an~ cna naeianal t~laphone natwor~
tnrou~n RNT caGlè~. Sai~ ~nte~face may ~e ~oen local and
trafflc ~epen~ent.
Thus, enrou~ C~a comm~tae~on ~nd con~rQ~ unlt
CCC i t 19 poggl~l~ tO affor~ an ~tom~t~e ineerc~nnc^tion
~etw~en a flx~d e~m~n~l sc~e~on ~ an~ a cele~h~r. central
0tatlon of both naelonal ~n~ ~nt^~n~cionaL ~xtene.
The commueae~on an~ conC,ol un~t C~ is 3a ically
comp~se~ of a m~ln cone~ol un~C CCP and a commutatian unlt
CC. The funceion of e~e m~n cont~ol ~n~t CCP i5 eo
eJta~lish an interfaca ~eeween e~e ~pe~rato~ 3ni th~ syscem.
for wnlcn purpose it is pro~e~ w~C~ a ~ata ~ank for tne
whole system, and allow ~Q~ e~ perfo~m3nc~ o~ s~seem
managemene an~ maint~nan~o func~.3ns ~ro~gh prosocol~

W092/21215 ~~ 6 PCT/BR92/~WXK
208~42 ~
designed for man-machine communica-ion. On the other han~.
the objective of the commutation ~nie CC is to control call
processin~, monitor base radio sta~ion ERB equipment and
perform management and mainrenanc~ fu~o~ionc commencA~ ei~her
at peripheral equipment in the main con~rol unit CCP or at ;
local t~rminal interface o~ ~h~ c~m~u~3eion uni~ CC ~s_lf.
Additionally, the cammut~tion uni~ CC ic
responsi~le for all call connec-.ion and disconnec~ion phases
including signaling, supe~vision. commutation and a}loca-l~n
of radlofrequency channels.
The oase ra~lo ;ba:i3ns --Ra which ~efiî.e
individual cells are conn~c~e~ ~o ~he commutation an~ conerol
unlt CCC Oy means of a four w~re analcg or ~i~i~al ci^.ann-!.
the communicatlon between ce~ls oa~n3 carried ou~ -hrou3n
radlofrequency, PCM ~eam or o?~ica} f~berâ, in ~ccor~anco
w~th the speclfication of eacn pro~ecC. ~n such a
communlcatlon system eher~ is a ~oice and data flow. ~owever
wlth a spec~Slc data l~n~ for Qen~ing and rec~iving conc~ol.
supervl~lon and lnformativa me~sa~es.
The maln funceion of each base radio stat~on ERB
19 to lnterface local su~scr i~ers wieh one anoeho~ snd/or
interface local â~cacr~e~s w~th na~ional telephonn nerwork
RN~ su~scrl~ers.
For r.hlS purpase eh~ ~ase ra~io ~eac.on E~B
snoul~ preferaoly compr~s~ ab ~ CwO racks ~n~i~n~tea as
radiofrequency and ord~n~ nes w`n~^n ara ~onnn~ee~ ~s ewo
omnldlrectlonal antennas as~em~la~ at ~ suita~le heL~e wnLcn
may affor~ a complete covera~e w~tn~n an ~varag~ r3~us of ~0
km (slxty kllometer~ a~oun~ e~e ~e ~a~o seat/oQ ~3. ~nus
conflguraeln~ an excen~e~ c~Ll.
~ no commun~c~e~on of ~n~ oa~e radlQ ~cacion -~B
w~th flxed eerm~nal ~cac~on~ r~ i~ c~rrl~ ou `nrou~n
raalofrequency c~anne~ w~Lch u~ sCan~rd proc~cols ~s~
sendln~ ~nd recelv~ng concr~l ~aea ~n!~ ~o~ca ~nals~ such
commun~cation ~eing car~^a ouc e~rou3~ fr~aquenc~ mo~ulaei~n
ln a radlo system operacing wiC~n Che ~00 ~2 ~n~n. ~n
other words, t~e communLcae~on ~ecwe~n C~a ~sa r3~ eaelOn
ERB and a g~ven fixaa C~rmin~l ~caci~n ~T~ 3rrL~ ~u-

WO92/21215 7 PCTIBR92/~HXK
~ 2~7~-~2
through control and voice channels.
~ he control ch~nnel supplios data between the
~ase radio station ER~ contrcller 3nd the fixed terminal
stations ETF of each cell, ~nd i ta functions aro to: send
information to fixed torminal sta; ans and monitor their
registers, inclu~ing messa~o regis~o- parameters and tho
frequency transmitte~ to fixe~ ~erminai stations; control
st~rted and completed calls; and datormine the avai~abil7ty
of fixed terminal stations ~o~ raceiving a call.
The voice channel pravides an audio interfaco
~etween fixed torminal sta iona ~ and the commuta ior. uri~
CC, Through the volca channo' are 30nt the audio supe~ision
tone TSA and Cho signalins -ono TS.
The voic~ channels 3~ 'O supply the 3udio li~k
and signal converslon to 3~s~.3ir. ehe call; ~oni~o~ -ha
radlofrequency slgn~l intensity; monitor ehe fixed ~armina}
statlon for access of facilities to subsc~i~er: and
dlsconnect the audlo super~ision eone ~SA during the c~ll.
The flxed terminal scacions ETF comp~e a low
power transrecelver coupled eo a ~i~actional antenn~ whlc~ ~s
dlrected towar~ ene ~ase ~a~lo seaeion and is ~lso provided
wlth the s~bscri~ers~ te~mlnaL. whic~ L5 fixed and ~f ~peciai
~nterest to the cell-ty~c te~aphone ~ystem of th~ pfesene
~nventlon.
2S ~he oper~Clon o~ tne ceL!-type e lnp~one ~yseem
wlth exeen~ed cell accor~n~ e3 e~ p~ sene in~ene.~n ~all
~e descrl~e~ nereln as foLlows w~e~ refsrence eo e~ree ~in~s
of call~ ~ one call f~o~ a f~xe~ e~mlnal ~e~tLon '~F eo t~e
natlon~1 telepnone neewor~ RNT: on~ call tram e~e nac~ona}
telepnone networ~ RTN to ~ f~x ~ ~erminal st~elon _TF; and
on~ call from a flxe~ Ce~m~n~L ~e~e~an ETF eo ~notner f~xed
t~rminal station TF.
In tne call from 3 f~e~ Cermln~l ~t~eion TF to
the nacional telep~one neewor~ RTN. ~nen e~e f~xe~ ee~minal
seation ETF 3u~scri~er starC~ e~- call, Che ~ase radlo
staclon ERB r~cel~e~ and L~eneL~es t~e re~uesc ~roug~ the
control cnannel and ~en~ sam~ e~ e~e commueaG i on unie CC
to~et`ner w1tn all otner ~nformaci~n rAqui~e~ e~ ~mpLete cne

WO92/21215 2 ~ g ~ ~ 2 PCT/BK92/0X~
call, ~iz: the subscriber's ~-laphone number, the
subscriber's se~ial number and the diaied number.
Th~ commutation unit CC ~hen selects a vacant
channel tO b~ used in the eall 3nd signals the base radio
station ERB to instruct the Lixe~ ~erminal station ETF to use
the selectad channel. Addi~io~al~-f, ~ha commutation unit CC
carries out the v~lldation of ~he dialed numbers to assure
that the su~scriber can then make ~he call an~ to ~etermine
the required route as well aâ :h_ ~ype of call.
1~ The connection estaDiishe~ throu~h the digiea
commu~ation the commutaTian uni- C_u -^omplatas the ~oica :in'~
from the ~ixed terminal s~ati3n _T~ and the base r-~io
station ERB with the nationai 'ei~phone network ~TN.
Alte~natlvel~, in ~r~e~ ~o p~ovide a low cost
iS route, the call may ~e rû~e~ ~y c~e ~ommutaCion un~C CC f~om
the cell-type telephone system to another commutation unie CC
ln another cell-type tele~hone system to then ~each ehe
natlonal telephone netwo~ RT~ acc~ding to the ~ecent~al~ed
sy3tem shown in Figure 2.
When t~e call is cQmplete~, any of cne pareins
who dlsconnect the commutation unit CC ~eleases all ~esou~ces
used ln the call. The ~e~iseer co~esponding Co ~ei~ call is
then t~ansmlteed eo the ~in conC~ol unie CCP to ~e use~
su~sequently in th~ p~oducti~n of ~ho ratin~ taoe ~nd t~af~ic
analy~ls.
When a call is m~e ~~~m. tne naeiona~ ~olephon~
networ~ RNT to a fixe~ CermLnal seaei~n ~T~. C~ n~C~nsl
eelephone necwor~ RTN acces3es ~ Cr~n~ in t~e c3mmuCaion and
conerol unlt CCC an~, tn~ou~n ~ ital swiCc~, san~s cne
correspondlng inormaclve ~igi~ e~ e~^ fi~a~ e~rmina: seaei3n
ETF suCscr~er.
T~ commueac~on an~ c~ne~31 un~t ~ earrias out
tne validatlon an~ d~LC Cr~n~l~Cion an~ LnsCru~ eno ~ase
~adlo qtatlon ER3 corre~pon~Ln~ to Che 1~caCa~ area co
actlvaee, ~hrou~ e~e control e~nn~}, t~e f~e~ ~ermin~l
statlon ETF selected, in ~r~e. C~ ena~l~ iC~ ~inl~c~ge wicn Che
nat~onal telept~one network RTN.
~ ~e ~ L ;~ ~ ~ a ~ !. X ~. ~J

WO92/21215 9 PCT/BR92/OWK~ ~
`~2~7~2
terminal st~tion ETF through the control channel and, when
the latter answers the call, tha commutation unit CC is
instructed by the ~ase radio station E~B to select the vacant
voice channel to ~e used in the cal}. The fixed terminal
station ETF is informed ~bout the s~lacted channel by the
bas~ radio st~tion ER3, ~nd th~ commutation unit CC connects
the correspondin~ di~ieal swiCch wnen the ~ixea ~erminal
~tation ETF is ready to recaive the c~ll.
Thus, the base r~dio sta~on ERB is inst~ucted to
alert the su~scriber, and the tele?hone set in the fixed
termlnal s~at~on E~B starts o rin~. W~en the fixed earmina~
statlon subscrlbe ~nswers ~he call, ~he voice link in ehe
natlonal ta7ephane netwa~k ~T~ am?ieeed.
Again, when the cali is completad, 3ny of thA
parties who disconnec~ tne commueae~on unit CC rele3ses al~
r~sourses used ln the call an~ generates a register
correspondlng to sald cal}, which register is sent ~o ehe
maln control unlt CCP to ~e u~e~ su~seQuently in the
productlon af ene rating tape and trsff~c analysis.
wnen a call is ma~e ~rom a fixed termLnal seation
ETF to anotner flxed term~nal ~tat~on ESF, wnen 3 f~xe~
su~scrlber start~ tne cal!, it ~s ~rocassed as aDove une~l
the dlglt translatlon sCep. ~t e~is point, C~a co~mucaC~on
unlt. CC datermlnes t~rough ~es ~a~a ~ank if ena calL was
2S dlreceed toward8 anotner f~xed eermlnal station ETF.
~ cn~s oeher ~xe~ e~ninai staeL~n ~ i9
~crved ~y the same commutatLon un~ t ~C, ene call 13 pro~essed
ln a regular way. On the ~ontrar~. Lf et~e suoscr~er i9
served by anoe~er commut~t~on ~nLe CC, a vacane e~un~ ls
~es~gnatc~ for the call an~ ~e L3 ensn proc~3~ f~xed
eermlnal ~taeion ETF eo a ~iK~ e~rminal ~taelon ~F cype
call.
The ~uDscr~ call~ s locate~ ~n~, ~y
answerlng tne eall, a voLc~ ~annel Ls ~eSlgnar~e~ eo
e~ea~ h the volce llnk ~eeween ehe 3tatlons. ~ai~ voLC~
llnk 14 esta~lls~ed ~esre~ng fr~m t~e comm~taclon unle CC of
the base radlo station E~3 eo~$pondLn~ e3 e~e fLxe~
~ermlnal statLon ETF wn~ch ~L~inat~ th~ ~al1 e~ eh~

WO92/21215 ~1l; lO PCT/BR92/~WXK
2~g~2 0
commu~ation unit CC in th~ oase r~o station ERB of tnn
fixed terminal station ETF ~ime~ at.
When ~ call is compl-t~ ny of the parties who
disconnect the commutation un~t CC rel~ases all resourses
used in the call and the rn~ist_r corrnsponding tO said call
is goneratnd in th~ ori~in ~as- ^ad.o station _R3 ~o bn
transmltted to the main contr3l UQie CCP tO be u~e~
subsequently ln the production ~f the rating tape and eraffic
analysis.
In thls syseem. ~he calls may be made ehrough a
flxed terminal statior. ~. wnor~ ^hn~n is room i~ ehe d~ea
bank avallablo for the rog~gto- 0~ calls made by every
subscriber.
An importan~ ~e3~r~ n cnll_~y?n ~~nphonn
system with extended cnll a__o~r.g ~~ ~e ?resen~ 1nvon~n
is the possibility of its ex3ansi3n t~rou~h secto~ng andfor
dl~lslon of cells.
Thus, t~roug~ a p~edo~n~~ined pro~ec~. iC ~s
possl~le to canfigurate t~e cells roquired for the ~itial
coverage of a given area, prec~s~!y d~torminin~ the location
and the n~m~er of cell~, and thu3 ~h base radi~ 3cae~ons
ERB~ requlred ln Che 3~'~ o~'Vel~. To suppore such
trafflc, groups of channeL~ ar~ aLL~cated for 3C~
always proport~ns} eo c~ ma~lLmum e~pact~nd t~a~f~
Hawever, c~e celL-eypo Cel~phone ~yse~m ~ h
extended cell of t~e proson' ~n~en~ion, ~ecau~e of 5~n
num~er of sucqcrl~er3, t^~Q~ono -r 3f f ~ C loa~ ~n~ ~the~
fac~ors lnclu~n~ topo~rap~ie ones. al~ows for ~ec~r~g an~
dl~l~lon of every cell ~n a sec~n~ ~ea~.
-~0 In tne former c a~ n e~ll iS ~ nto
sector~ w~ic~ e~en be~n co ~ w~c~ ~y 5~e ~ommueasion
and control unit C~C a~ now cell~ ~n~, ~n sne l~cer _a~e,
t~e cell eo ~e ~lvi~ g ic~ e~u_g~ ~y th~
eransmitted power decre~se. ~ em~/ning ~rea ~u~ 3eing
covered t,~ a new cell, w~ic~. ~es~!~s ~n ~^ve~l ~Lcrocells
lnstead of one macrocell.
T~e invention ~ein~ d~scri~e~. it ~hall ~e
understood t~at several mo~ n~ ~n~ v~rl~ ons may ~

W092/21215 11 PCT/BR92/~WXK
2~87~2
made thereto, provided that such mod-f_c tions and variations
do nat depart from the spir~t ~n~ scope of the invention as
defined in the appended claims.

Representative Drawing
A single figure which represents the drawing illustrating the invention.
Administrative Status

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Event History

Description Date
Inactive: IPC from PCS 2022-09-10
Inactive: IPC deactivated 2011-07-27
Inactive: IPC expired 2009-01-01
Inactive: IPC from MCD 2006-03-11
Application Not Reinstated by Deadline 1994-11-19
Time Limit for Reversal Expired 1994-11-19
Inactive: Adhoc Request Documented 1994-05-19
Deemed Abandoned - Failure to Respond to Maintenance Fee Notice 1994-05-19
Application Published (Open to Public Inspection) 1992-11-21

Abandonment History

Abandonment Date Reason Reinstatement Date
1994-05-19
Owners on Record

Note: Records showing the ownership history in alphabetical order.

Current Owners on Record
ALCATEL TELECOMUNICACOES S.A.
Past Owners on Record
LEONHARD KOROWAJCZUK
Past Owners that do not appear in the "Owners on Record" listing will appear in other documentation within the application.
Documents

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Document
Description 
Date
(yyyy-mm-dd) 
Number of pages   Size of Image (KB) 
Abstract 1992-11-21 1 43
Cover Page 1992-11-21 1 13
Claims 1992-11-21 2 66
Drawings 1992-11-21 1 20
Abstract 1992-11-21 1 48
Descriptions 1992-11-21 11 450
Representative drawing 1998-07-29 1 6
International preliminary examination report 1993-01-18 9 382
Courtesy - Office Letter 1993-03-31 1 27