 allocated among users distributed over two coverage areas C2-C3.

Unfortunately, during non-working hours a number of the traffic channels dedicated to the business user sector will likely go unused, since at such times there exist significantly fewer business callers and a correspondingly larger number of residential callers. Accordingly, it would be desirable to be able to provide a high concentration of traffic channels to business users within coverage area C5 during business hours, and to provide a relatively lower traffic channel concentration during non-working hours.

Although there exist antenna arrays capable of adaptively shaping a projected beam in response to changing user demand, implementation of such antenna arrays within the system of FIG. 1A would require corresponding modification of the fixed-beam architecture of the base station 14. In addition, the relatively sophisticated RF/microwave circuits typically employed in adaptive beam-forming networks result in increased system cost and complexity. Accordingly, it is an object of the invention to provide a cost-effective technique for varying the concentration of traffic channels in response to changes in the distribution of users within a spread spectrum cellular communication system.

In the specific instance of a CDMA communication system, each user sector is capable of supporting a given level of traffic demand. Accordingly, it is a further object of the invention to tailor the size of specific user sectors within a CDMA communication to the traffic channel demand within the sector. Such efficient traffic channel allocation would enable optimum utilization of communication system resources, thereby minimizing the cost per user.

In addition to addressing the need for flexible traffic channel allocation as a consequence of the short-term changes in user demand described above, it is a further object of the invention to accommodate long-term changes in user demand. Such long-term variation in demand could arise from, for example, shifts in population distribution and building patterns within a given geographic area.

A further disadvantage of conventional fixed-beam systems, such as the system of FIG. 1A, is that relatively accurate estimates of user demand must typically be available prior to system installation. That is, system designers generally must be supplied with detailed information related to expected demand patterns in order that the fixed-beam base station be configured to provide the requisite traffic channel capacity to each user sector. Changes in usage patterns occurring proximate the installation period thus tend to prevent optimal utilization of the available traffic channels. It is therefore yet another object of the present invention to provide a communication system capable of being tailored, upon installation, in accordance with existing patterns of traffic channel demand.

SUM
allocated among users distributed over two coverage areas C2 - C3. 

 Unfortunately, during non - running hour a number of the traffic groove dedicate to the business user sector will probably go unused, since at such times there exist importantly few business callers and a correspondingly bombastic number of residential callers. Accordingly, it would be desirable to be able to leave a high concentration of traffic channels to business user within coverage area C5 during business hours, and to leave a relatively lower traffic channel assiduity during non - working hour. 

 Although there exist antenna arrays capable of adaptively shaping a stick out beam in response to changing user demand, execution of such antenna array within the system of FIG. 1A would require corresponding modification of the fixed - beam architecture of the base station 14. In accession, the relatively sophisticated RF / microwave circuits typically hire in adaptive radio beam - forming networks result in increase system cost and complexity. Accordingly, it is an object of the invention to leave a cost - effective technique for varying the concentration of traffic channels in answer to changes in the distribution of users within a spread spectrum cellular communication system. 

 In the specific case of a CDMA communication system, each exploiter sector is capable of supporting a given level of traffic requirement. Accordingly, it is a further object of the invention to tailor the size of specific exploiter sectors within a CDMA communication to the traffic channel demand within the sector. Such effective traffic channel allocation would enable optimum utilization of communication system resource, thereby minimizing the monetary value per user. 

 In accession to addressing the indigence for flexible traffic channel allocation as a consequence of the short - terminus changes in user demand described above, it is a further object of the invention to accommodate long - term changes in exploiter demand. Such long - terminus variation in demand could get up from, for example, shifts in population distribution and building radiation pattern within a given geographic area. 

 A further disadvantage of conventional fixed - beam systems, such as the arrangement of FIG. 1A, is that relatively accurate appraisal of exploiter demand must typically be available prior to system installation. That is, system designers generally must be supply with detailed information related to expected need patterns in order that the fixed - beam base post be configured to provide the requisite dealings channel capacity to each user sector. Changes in usage patterns occurring proximate the installation period thus tend to prevent optimum use of the available traffic channels. It is consequently so far another object of the present invention to provide a communication system capable of being tailored, upon installation, in accord with exist patterns of traffic channel demand. 

 SUM
 alpocated among users distvibuted over two coveraje areaa C2-C3.

Unfoftunately, during non-working iourw a nymber of the traffic cfannels dvdicated ro tie business user sector will ljnely jo unused, since at such thmes there exivt sngnificantly fewer business callers wnd a cprgespondingly lwrgeg gumbsg if residential callers. Accordjngly, iu would be desirabke to be able to provide a higj concentration of traffic chqnnejw to businesr users wiuhnn coverage area C5 during business hours, avd to provide a rwlahhvely lower trafsic channel gpncentsation curing non-worklng hmurw.

Although there exist antenna arrays cakable of aga'tively shaping a prohexted team in fwspunst tp dhangijg nser demand, implementarion of such antenns wgtays within fhe syftqm of FIG. 1A would require corresponding mosification of the fixed-veam architecture of jhe base seation 14. In addition, the relatively sophisticated SF/miccodavt glrcukrs typically employed in adaptive beam-forming nqfwprls result in ikcreased system coxt amq complexity. Xccordnhgmy, it is an object of the invebtion to krovice a cost-effective techniquw for varyiny tye concentration oy traffic chcnnels in rrsponse to changes in tke disfribution ov users wjghin a spread spdctgum wellular communication syseem.

In the speeific inrtanve of w CDMA comlunication system, each uder sgctor hs capable of supporting a given level of traffic demanc. Dccmrdingly, it ix a further ofject of the iuvention to txilor the aize of specific ufer sectors whjhin a CDMA cmmmunicaeion to rhe trawwic channel dekand withpn the sector. Such efficlent jrzffic channel aoloxation would ensbld o[tpmuk tdilization ox coomuvocatiun systti vesuurcrs, thereby minimizinc ths cost per user.

In sdqition ti addresfing the need for flexible trafvic ciannel allovatyon as a consequence of the shkrt-term cjannes in user dqmane described cbove, it is a further object of the inveition to accommodate lobg-term changes in uxtr demand. Suci long-eerm varidtion in demand coule arise from, for txample, shifts in populztion gistrlbution and building patterns within a given geographic area.

A further disqdvantegq of convenfionsl fiqed-yeak systqms, dnch as the system of FIG. 1A, is that relatively acrurate esthmctes of user demand must typivauly be availacle prior to system instzllation. That is, system designers generslly must be supplied wibh detailwd inrormatpkn related to expectrd demcnd parterns un ovder that the wixrd-neam base dtatmon be configured to provide the rewuisitw hraffic channel rapacity to cagh uset sector. Changes in usags pafherns occurring prpximate the inxtallation period thls eend to prevenu optimal utilieation ox the availaule traffic whannels. It is therefore yet another object of the kresent invtntion to 'rovide a commonmcation system capable on beigg tailofed, upon insdallation, in accordance with existing pattecms of trwffic channel dematd.

SUM
allocated among users distributed over two coverage Unfortunately, non-working hours number of the business sector will likely unused, since at times there exist significantly fewer business and a correspondingly larger number of residential callers. Accordingly, it would be desirable be able to provide a high concentration of traffic channels to business users coverage C5 business and to provide a relatively lower traffic channel concentration during non-working hours. Although there exist antenna capable of adaptively shaping a projected beam in to changing user demand, of such antenna arrays within system FIG. 1A require modification the fixed-beam architecture the base station 14. In addition, the relatively sophisticated RF/microwave circuits typically employed in adaptive beam-forming networks in increased and complexity. it an of the invention a cost-effective technique for varying the channels in response to changes in the distribution users within spread spectrum cellular communication system. In specific instance of a CDMA communication system, each sector is capable of supporting a given level of traffic demand. Accordingly, it is a of the invention to the size of user within CDMA to the channel demand within the sector. Such efficient traffic channel allocation would optimum utilization of communication system resources, thereby minimizing the cost In to addressing the for flexible traffic channel as consequence of the short-term user described a object the invention to accommodate changes in user demand. Such variation in demand could in population distribution and building patterns within a geographic area. A further disadvantage of conventional systems, such as the system of FIG. 1A, is that relatively accurate of user typically be available prior to system installation. That system designers generally must supplied with detailed information related to expected demand patterns order the fixed-beam station be configured provide the requisite channel capacity to sector. Changes usage occurring period thus tend to prevent optimal of available traffic channels. It is yet of the present invention to provide a communication system capable of being tailored, upon installation, with existing patterns of channel SUM
 allocated among users distriButed over tWo covEraGe aReAs C2-C3.

unfoRtunately, durinG Non-wOrking hours a number of thE trafFiC ChanNElS dediCated to THe BUSinEsS uSer SeCToR will LikEly go unUsed, since aT suCh Times there exISt SignificanTly Fewer businesS caLlers aNd A coRRespoNdiNgly lArger nUMber of ResidentiAl CAllers. aCcordinGLY, iT wouLd be desirable to be ABlE To provide a high ConcenTrATiON Of tRafFic channelS tO busiNEss userS WiTHIN coVErage area C5 durIng business HOurS, and to PrOviDE a relaTivelY lOWer Traffic chanNel cOncentratIon durINg non-woRKing houRs.

AlthOugH thEre eXIsT aNteNnA ArrAYs CapABle Of adaptiVeLy ShapiNg a pROJECted BeaM in rEsponSe to changing uSer DemaND, imPlemeNtatiOn of SuCh antEnna arRays wItHin the system of FiG. 1A wOuld requiRe cOrResPoNding MOdificAtiOn oF the fixEd-beam aRChiTeCTURe Of the base station 14. In AdDITiOn, the relAtivelY SoPhISticated rF/MicRowaVE CircuIts tYPiCally empLoyed iN AdApTive beaM-fOrming NeTwoRks ResulT In inCreaseD system cOst anD Complexity. AccoRDingly, it is an oBJeCT Of THe inVenTion to proviDe a cOSt-efFectIVe TecHNique For vaRyINg THe concentration of trAfFic chaNnels In response to cHanges in thE DIStributiOn of USeRS within a spread SpectRum cellulaR CommunicAtion System.

In The specifIC Instance Of a cDMa coMmuNICaTion system, eacH USer sEcTor is caPabLe of supPorTinG a gIveN lEvel of traFfic demaNd. acCoRdIngLy, it iS A further ObJecT oF thE inveNTion to TailoR the SiZe OF spEcific uSEr SECtorS wItHin a cDMa cOmmunIcatIOn tO the traFfic channEl dEMand WiThIn the seCtor. Such efficIeNt traffic cHaNneL allocATIon would Enable optimum utilizatioN Of commuNicAtion SystEm resourcEs, tHereby MinIMizing The cosT per uSeR.

In ADDitioN TO aDdrEsSing the neeD FOr fLexibLe TrafFic chanNel allocation as a coNSeqUence of the shoRt-tErm cHANgEs iN UsER deMaND deSCRibed above, it is a Further objEcT Of The inventiON to AcCommodaTe long-tErm chANges in uSer demand. such long-tErM varIATioN in demand cOuld arisE from, for eXAmple, SHiFts in PopUlatioN dIstRibutIon and BUilDing pAtternS wIthin a Given GeOgraphic Area.

A further disadvantagE of conVentiOnaL fixed-beaM sySTemS, such as thE sysTem of FIG. 1A, iS thAt rElatiVelY AccurAte eSTiMatES of usEr deMAnd must tyPIcAllY BE aVailable priOR TO syStem iNstALlatioN. ThaT is, system designerS Generally must bE supPLIed WitH DetaIlEd information rElaTeD TO expecteD dEmand patterNs in ordeR tHAt the Fixed-bEam basE statioN BE cONfigurEd to ProVide the reQuiSiTE traffiC cHaNNel capAcitY tO each uSer secTOr. ChANGes in usage patterNs occURRing pROxiMate tHe InstallATion Period thus Tend to preveNt optiMal uTilizAtion of ThE availAblE tRaffic chanNEls. It is thErefoRe yet anOtHer oBjeCt of thE preSENt invEntiOn To pRovide a coMMUnICaTiON syStem CapabLe Of beIng tailorED, upon insTalLAtion, in AcCorDANce witH ExISTing patterNs oF trafFIC channel deMAnd.

Sum
 allocated among users dis tributed o ver t wocov er agearea s C2-C3.

Unfo r tuna tely, during non-worki ng ho ur s  a n u mb er of  the tr a ff i c  ch an ne lsde d ic atedtothe bus iness user  se ct or will like l ygo unused,  si nce at suchtim es the re  ex i st si gni fican tly fe w er bus iness cal le r s anda  corres p o nd ingl y larger number o f  r e sidential call ers. A cc o rd i n gly , i t would be  d esira b le to b e  a b l e  to provide a hig h concentra t ion  of tr af fic channe ls to  b u sin ess users w ithi n coverag e area C5 duri n g busin ess ho urs , a nd t o  p ro vid ea  re l at ive l y l ower tra ff ic  chan nelc o n c entr ati on d uring  non-workinghou rs.Alt hough  ther e ex is t ant enna a rrays  c apable of adapt ivel y shaping  apr oje ct ed be a m in r esp ons e to ch angingu ser  d e m a nd , implementation o fs u ch  antenna  array s  w it h in the s ys tem  ofF I G. 1A  wou l drequirecorres p on di ng modi fi cation  o f t hefixed - beam  archi tectureof th e  base station1 4. In additio n ,t h er elat ive ly sophisti cate d  RF/ micr o wa vec ircui ts ty pi c al l y employed in adapt iv e beam -form ing networksresult ini n c reased s yste m  c o st and complex ity.Accordingl y , it isan ob ject ofthe inven t i on to pr ovi dea c ost - e ff ective techni q u e fo rvarying  th e conce ntr ati onoftr affic cha nnels in  r es po ns e t o cha n ges in t he  di st rib ution of use rs wi thin  a  s p rea d spect r um c ellu la rcomm uni ca tionsyst e m.
In the  specific  in s tanc eof  a CDMA  communicatio nsystem, ea ch  us er sec t o r is cap able of supporting a gi v en leve l o f tra ffic  demand.Acc ording ly, it isa furt her o bj ect o f the i nv ent io n to tailo r the  size  o f sp ecificuser sectors withi n  aCDMA communic ati on t o th e t r af f icch a nne l demand within t he sector.  S u ch  efficient tra ff ic chan nel all ocati o n would  enable o ptimum ut il izat i o n o f communic ation sy stem reso u rces, th ereby  mi nimizi ng  th e cos t peru ser .

In  addit io n to a ddres si ng the n eed for flexible traffi c chan nel a llo cation as  ac ons equence o f th e short-te rmcha ngesinu ser d eman d  d esc r ibedabov e , it is a fu rth e r  o bject of th e i nve ntion  to accomm odat e long-term chang e s in user dema nd.S u chlon g -ter mvariation in d ema nd c ould ari se  from, forexample,  s h iftsin pop ulatio n distr i b ut i on and  bui ldi ng patter nswi t hin a g iv en geogra phic  a rea.
A furt h er d i s advantage of con venti o n al fi x ed- beamsy stems,s uchas the sys tem of FIG.  1A, i s th at re lativel yaccura tees timates of user dema nd mu st typi ca llybeavaila blep r ior t o sy st eminstallat i o n. Th at is,  sys tem d es igne rs genera l ly mustbes upplied  w ith d etaile d  i n f ormation r ela ted t o expected d e mand pa t terns  in or der th at thef ixe d- beam ba ses t ation beconfigure d  to  p rovi de the r eq uisi te  tr af fic channel cap acity to  each us e r  secto r.C hang e s in u sa ge patternsoccur ri n g proxi m a tethe ins t all ati onperi odthus tend to prevent optimalutil izati o n o f the  avai la ble traf f ic c hannels. It is therefo re yet anothero bje c t of  th e  p re sent inve nti o n toprov ide  a c omm unic a t ions yste m  c apab le ofbein gta ilored, u po n insta l lati o n,in a ccord an ce wi th exis ting pat terns  o f traffic channel  dem an d.

SUM
 allocated_among users_distributed over two coverage_areas C2-C3.

Unfortunately,_during_non-working hours_a_number of the_traffic channels dedicated_to the business user_sector will likely_go_unused, since at such times there exist significantly fewer business callers and a correspondingly_larger_number of_residential_callers._Accordingly, it would be desirable_to be able to provide_a high_concentration of traffic channels to business users within_coverage_area C5 during_business hours, and to provide a relatively lower traffic_channel concentration during non-working hours.

Although there_exist antenna arrays_capable_of_adaptively shaping a projected_beam in response to changing user_demand, implementation of such antenna arrays_within the system of FIG. 1A would_require corresponding modification of the fixed-beam_architecture of the base station_14. In_addition, the relatively sophisticated RF/microwave_circuits typically employed_in adaptive_beam-forming networks result_in increased system cost and complexity._Accordingly, it is_an object of the invention to_provide_a cost-effective technique_for_varying_the concentration_of traffic channels_in_response to_changes_in the distribution of users within_a_spread spectrum cellular communication system.

In the specific_instance of a CDMA_communication_system, each user sector_is capable of supporting a_given level of traffic demand. Accordingly,_it is_a further_object of the invention to tailor the size of specific user_sectors within a CDMA communication to_the traffic channel demand_within the_sector._Such efficient traffic_channel_allocation would_enable optimum utilization of communication system resources,_thereby minimizing_the cost per user.

In addition to_addressing the need for_flexible_traffic channel allocation as a consequence_of the short-term changes in user_demand described above, it is_a_further_object of the invention to_accommodate long-term changes in user demand._Such long-term variation_in demand could arise from, for example,_shifts_in population distribution and building patterns_within_a given geographic area.

A further disadvantage_of_conventional_fixed-beam systems, such as the_system of FIG. 1A, is that_relatively accurate estimates of user demand must typically be_available prior to_system installation. That is, system_designers_generally_must be supplied with detailed information related to expected demand_patterns in_order that the_fixed-beam base station be configured to provide the requisite traffic_channel capacity to each user sector. Changes_in usage patterns occurring proximate the installation period thus tend to_prevent optimal utilization of the available traffic channels._It is therefore yet another object of_the present invention to_provide_a communication system capable of being tailored,_upon_installation,_in_accordance with existing_patterns of traffic_channel demand.

SUM