CA2631029A1 - Methods and systems for providing enhanced position location in wireless communications - Google Patents

Methods and systems for providing enhanced position location in wireless communications Download PDF

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Publication number
CA2631029A1
CA2631029A1 CA002631029A CA2631029A CA2631029A1 CA 2631029 A1 CA2631029 A1 CA 2631029A1 CA 002631029 A CA002631029 A CA 002631029A CA 2631029 A CA2631029 A CA 2631029A CA 2631029 A1 CA2631029 A1 CA 2631029A1
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reference signal
pilot
signal
time slot
channel
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CA002631029A
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CA2631029C (en
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Peter J. Black
Matthew S. Grob
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Qualcomm Inc
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G01S5/0205—Details
    • G01S5/0221—Receivers
    • G01S5/02213—Receivers arranged in a network for determining the position of a transmitter
    • G01S5/02216—Timing or synchronisation of the receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2628—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/08—Mobility data transfer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/14—Access restriction or access information delivery, e.g. discovery data delivery using user query or user detection

Abstract

Embodiments disclosed herein relate to methods and systems for providing improved position-location (e.g., time-of-arrival) measurement and enhanced position location in wireless communication systems. In an embodiment, an access point may replace information (e.g., data) transmission by a "known"
transmission (or "reference transmission") at a predetermined time known to access terminals in the corresponding sectors. The access terminals may use the received reference transmission to perform a position-location measurement, and report back the measured information. The access point may also send a reference transmission on demand, e.g., in response to a request from an access terminal in need for a location-based service.

Description

METUODS AND SYS'TF MSFOR .PRIIJVl.l?.Il! G ENHANCED
POSI.'T.1.ON LOCkT1O\ lN WIRELESS C~)MMIN.ICF~.'.I'IONS
BACKGROUND

Field looOll This clisca(os :re rela.Ã;~sgene.ral(y to wireiess communications.
Mt>re, specific:a:lly, embodiments disclosed E-ierein relate Ão l.~rovidimg ir7~proved mneaotrarrival cnet3surement atiti exiht3ncGdl)<asitirzD Iocat:Ãon an;zaAeless crsn~~~tunication ~s'vsÃertu.
Bac_kgt=utitid (to02] Wi re1ess communicati on s-v-st~fns are %z~lcfely deplc?yed to provide various vy-pes of ct>irtmnanic:i:tit>ils (such as o:czice zuid <IaÃ.i) trs mrtltilale users.
Sr.icli systG~~~~ ~~~ay be based an code clivisicirt iiitiitigal~ access (CD'4IA), tirtie, tlia isaon mtalt.:iple access {'.1-'13~IA), f:reeltac:ncy division ~iultiple access (l;UNI,~), or otlicr mtilti.l.~le: access tectiriiqties. A ~Nireless coiririiu n.1ca:ti c}n s,: steiri may be designed te} iinple-t~ient oi~ae e}r cnrs.rG siantlards., nich a..5 iS-95_ c:tima.2000., ISr8'~<>. W-CDMA., TO-SC.D?41A_ atrti other stancla.rds.
twOsll Presence Ãletection and 1c?cation-ba5eÃI services have lon)- been sc?isqlit afier in e~Jreless son-1111uriicatioris. iri addition to srflppe}rt:ing enxergens~~
~era ices (e.g.. E91 1 eril1s). x0reless operator5 are *4i~ini.~ to g?r<nisle zi i-~>iÃle rar1;;Ye of uetiv applicatiOUS
tarofciecl .('or the ea-era~~dn corIStU110r ancl ellteTprisO Us&r, sUc:h <Is C_hi.kl Iocators, t rtt-ba~.-turri navigation, directot-~~ ~~rvic:e4. ~:oice concierge. roadside ;:issistwice. and many others. A cha1lerwe hence lies in pcc:+0din;;- accurate and reliable:
posit:ion location te}
cr#al?l~ such applications.

BRIEF DESCRlP'I'IOP"ti +C.3F'>I'HE D1LAWINGS
(W041 FIG 1 illustrates am wrabcsrlitraent of a N%ireless sorilinuriicatiori sv5teixl;
(ooÃJ'-sl FICi% 2) ill ustraÃe:s wY cÃiibodiÃiieÃit offorlvarel lirik slot strur:.ture. in mY I4-856 type ti\' S ti::tTt:
IiKt061 FIGs. illtastrate ensbodinsents of f:c>r~~ard lisik slot structÃtr~
for referen.ce tratisriiissiori, ry J(H)Ã17] F1.G, 4A illrÃstrat:cs an ensbodinscnt of forward link strt-cture. in an 1S-95 ty-l}c ~e fiÃ~tYt_ (fjoÃJsj FfCi% 4B illustrates aii ezyit3cydiiYiviYÃ o.{-' forNvarci lirrk sÃ-i-ucturc for ref'erence, transrÃli s; i0t1 n Ii-Kt091 FIG. 5 illustrates a 17~~~~ diagram of a prc>cess. Nvlsich may be r.Ãse.d to Ã1nplenscnt some disclosed em~.~odiments.
liwÃt] p"iC1 6 i11UStr4-rWs a OcÃNv diagram of a procvss.: which maly l?e.
used to implerrYCrrt some disclosed cmboclimeÃ7-t_s;
l.t~ F1.G, 7 illr.Ãsla'cites a flow diagram of a process, svhiclÃ. may be used to irilpleme.nt some disclosed eÃiibodiÃiieiyt:s:
(0012] FfCi% 8illÃÃ.4tratc:s afloiv dia:;rarrY oE'a proces4, wIxiclà may Y~e Wscd to iiirplezyieziÃ
s;c3anc disclosed onibc3dinientss loÃIt31 FIG. 9 ilitÃstra.tes a block diagrarn of a1i apparatus, in i0ich son1e clisc.losecl embodiments mav be implemenÃ:ed; wÃd p'1G, 10 illustrates a block dia.grUin Of an apfallraÃ-Us, i.rr R:lÃich stÃrÃiG cl.isc.lose:d +;mhtrdiancnts may be implemented.

I3 ETAILE.O I7AESi.: Rl F'l'l ON
F.mto<lir-nerits disclosed liereiD relate to rriethod-, ai-id systems ltrr prtÃvitliri~
enhanced ptrsi-tican location in xvireleys comÃ-t-ÃtÃnication yvstems, (11t116] An access point (AP) di5clos~.:cl fieruin may incltadc: and./iar iinpluniont functions of a baseastatiorà transceiver s~.sÃem (B'I'S), wà access new-c~rk-transceiver (AN'I:), a crarsdGrrt ptx>l irzrl-isc.Giver (MPT *), or a titÃdc B in:Ã. W-t_'O.M A iypc Svsterra), etc. A
cell may refer to a coverage area fierviced by an A.1'. A cell a:nat' fiÃrtheÃ-ia:Ãc.lrade one or yuore: sectors. For simplicity ayitj clarity, the tenn 'sictor ' may be tÃse:(l herein to ret~~:e>r. Z.
cell, or a section c}i. 'a cell, 5erviced by a:ri ::1:1'_ Iturthc _ ari access ncÃ? vork controller (A tiC ) .1nay refier to t1-ic portion of a communication systerra configured to intGrlzÃce eviili {Ã. core, rÃet.woÃ=k ~~.~.. a pacl;.eà d{Ã:[a rictwtark} <uÃcl route data pac:kcÃs bctAa.eezà access terminals (XT's) and iliu c(?re network, perform various radio access aaid liÃik ri--mintcriance functions 1;sucli as soft baridol'I I- ccniÃrol radio traÃi5riuitcrs, and reseivcrfi-ai-id so oÃi. Axà ANC mt3-v incltÃde tÃnc,l;'t>r irnplerraGrÃt the f_uncÃirs.i-rs of a base station controller (BSC), strcl~ ~ f:ssÃtr~d in a r~r ~rrr geÃ2er'~lior~ ~~~irelvss Ã2et~.~~t~r~. An ANC ar'id orrc or rrxc:+ e APs zirav cori5titirtc pam ol'am access rretAN.--c:+rk (AN).
pÃ171 :lzi accoss tc:r-minal (AT) dc:sci-ibc:cl 1r.ercir:Y rrr,ay retc:r tomrious types of devices, iriclr_aclin4= (bt.rt ticat liniit;'':d. to) ~xvir=ele;;r lrlicines a cellular pticane. a laptop e;cariiputer, a srlultim:cdia,,vireless device, a wireless communication personal computer (f't_'.,} card, a perscrrial digital asaistwrt WDA). ari external or int:emal mcrdern, eÃc. :'uy AT may beany-data. device. ilr.at cainmur#.icaies flYrour:;lr a ,~ircl~4s clYxiriel and/or through a Avirod channel (e g.n 1~~~ Nvay ol'trbr:vr optic or coaxial cables). Ari XT' rmay krive various riames, strc.h as access trriit, access node, subscriber itriit, mobile station, rlit>bile device, niobilc unit, nicrbile }?lirsrie, rr,robile., remote station, remote terminal, remote r.rBrit, user devicr~>
user eqUipMer#t., lr.wrdtielci dcvir:.e, etc. 131f1c:rer#t ATs may brw iricarporatc:cl into a system. ATs may be mobile or- static3na.ry, arxd nx<ry be dispersed tlxrolaglrout a cionirrrunication s-%--stern. An AT may communicate with or1e. or rirore APs on a forzxarcl liirk and,'or a reverse liirk at a given moment. The trsro~~ard liirk (or drs -I-ilink.) refers t~.~
transrnis~siou f:ro.in ar7 AP to an AT. Tlie, rr~N-erse link (or ralrl.ink) ref:Grs to t.ransmisSiO.r7 I:rtrm thc XT to the Af?.
Im1.81 i_,iacaiiagg a pers'iari or ari objr;=:::cà ~vir.r;:lc:ssly may be achieved in a aurn.ber of'ways.
'-('irr,re-crf-arriviii (TOA) n-vaaurerr.rent, which uses tir;i-ic, it takes tor a. signal to travel as an in<lirect rneiliocl of ealcultrt:im, , disttr.nce, i;: c<anir.n<anly iwv olveti irx tr. .rrrtrribc.r of nehvtrrk., based methcacls, For rrx1rmples in some d.vircless netd.vc3rky, position location scn~ices re:clirire>TGA niutt5trr.et'nerit ol.' i1ie l:riliaà si~rral lu (' . the r,arliesà path of illu pi.lut), [i~Ãt19J F1G 1 iiltrstrate~ a wireless con-imunir~.atiorr ayst:em 100 r~.otil'igr.rred t~.~ support a rrLrr>:Iber Of rtsGrs, in I.vllick~ ~~ar-iotrs <lisclt>sed emborliMe.rrts and aspects ri'aay. be ir:nplcmarited, as further described below. ~y -,vay of e:sample syst.enx .lE)E) provides cornmtrnication. l.'or tt ntrnibur of cells 102, iricl.udinp -, cells I0'a-1024q, with each cell beirw sen icecl by a corresponding AP 104 (sircl~ as AI's 1 04a-l.t~4,g), Each cell may iJc further tl:iOdG<l into one or ~~torG ~sectt>rs. Various ATs 106, incltrdi.ri#Y.A:Ts 106tr-106L
are cfi:~perwd, [lr.r=ouglrt>ut t}tesy:t.ertr.. Ea.cfi.A'T' .1Ã36 :r7tay c;aznrnurricate w.i[li orie or r~>:rt>:r~:~
Al's 1.04 on a. forward link and/or a reverse lirik at a given rnr;?mcnt, cfepencfun4q Ãrpoli ANhctixcr the AT is active and whether it rs in soft }iaridcsil; for exarrxple, [lltlkÃ)J 1.1-1 FIG. l, a solid lirie ;zrtli wi arrow mt3z- ixitiac:zite information data) fran 111is,siorr. from an AP to an AT. A broken lirr.e witlr an arrow ma:v indicate that il-ic AT is receiving tlie pilot and other signaling/reference si<~~ials, but no data trarismission, fre}in the A1?, as further described beIc:+w. l;'or clarity and sirrxplicitv ,Ãlae rcver5e: l iril;
r::crrrImunication is 110t explicitly shotvri iri FIG. 1.
lowI] iri a liiglr rate packet data {l-IRPD} sv;terir. (e.g.. as specified in " cdiaia''.t1t14] 1:1i0i Xatc Packet Data Air l_titer-l:a:ce Specil'icat:ion,. 3GPP2 C.SO0'?~Ã-A"
Version 2, ,luly ~'t)t)a?"
referred to as "'1xEV=DO" (or "'IS-856'.:) hereiir}, t~.~r example, t:ransmission on t:orivarcl lizik is partitioned irrtcy ascctuence of E:rame~:: vacIr. E:i=aiiie is furilr.er divided iiitcy tizrio slots 16 slots each wi-tli ~,~ duration of l.667 i-nsec); and each slo-t includes a plurality- of tiÃtie-division-multipleaed cltannel.s.
(4tÃ)22~ By o~-ay of exairtple. F(G. 2 illustrates an eit-ibodimeitt of a foro~-ard link slot strr :..turc: xÃ3Ã3, sucli as employed iri a laEV-DO Ãytae systeiYi. TiiYiv 4lot '0t:? is divided into mo kr1ilt-slots, dvith each lralt=slot having ihc I'c3llowir7g channel assigt~~~ents: Pilot e:hanlrel 2 1 t}, forzxarcl rirediuan "giccess control (MA.f ') e~hanlrel ""t), and fc}rward traffic (or control) chartryel 230, l'ilcrt channel 210 carries the pilot sigi-ial (also ccrr7-urroniv terrxled ws, Ãtle: lsiloÃ:) used by an AT (such ws, A-T 1()6 i.ri HG. 1) fo.r .irriÃ:ial acquisit.iorl, phase rect?Y +;rys tyiniaig recot cra>, r<rclio coa-nhiaiicrg. as dvell as estimating the clxanncl co:ndiÃions on forward. linl~ ~e.g., by vvay of the (S1?4~) measuren~enÃ). MAC chwrnel 22:0 sets t:ortl7 the l.~roceclures tised to receh.e wid transmit Oo:er the p1i~ sical lav. er (which provides the clrzrririGl st.rt:tctLirG, ftequencz', poi.ier ot:t :put, mt?dul<rtiocrn ent;oding s;peciticatyons for fordvarfl arifl reversc links).
Traffic charizrel 230 .n1ay cam- inforriiation. or data {~..~.. by way of phys'ical l.aye:r pac.kut5), e.g.., unicast data specitie to a particular :l'I' (?r tasei ), or brrsadcasà 'multicast data to agr~~p of users (e,g, as specified in "ctl.rrra2000 High Rate Brt>adcast-M ltica.si Packet Data Air lriterfac.e Sl~ec.il'icatic?n.." 3GPP2 C;.SO054-0, Version ?.dl, July 2005. reforred Ãcs a.s "BC:~4~tt='4 5pecii:icrttiian' herein). Traf'hc channel :230 rnae a1so be Ãasetj to carry control ane5sages.
Furtlrcr, pilot channel 210, iAAC cl~~ine1 ~~'~~'(3. and traffic clxaririel 230 are tiri--wrcfivisiOri~
1nultiplGtied ivitlun ti~~te sl<at 200. When there is no traffic ori tra('(-ic: channel 230, 'ari .icllc slot ii-iÃ:.ltadi.iri, pilt>Ã cliair.ir.el ~? 10 azr.d NVIAC cliairnel 220 may be ss'ent. Transmiss:Ãori oÃ'idle sl(?ts surt'es to decrease intc:ri:ercncu to other cell.s' on fbr~t~ard linl:.
100231 As illustrated in FICk 2. pilot channel 21[) :iS t:rarisrrx:ittcd in discrete bursts (as opposed to be-iDAY c.trc1t111LaOUs :iri tirnc), lierice having lin-utcd przi-ver, l.n st~irte syste-cras-, for eaa.mple. flilcri chacmel 1-10 ri-iav ccrri-iprise 96 chips of a. pa.rt-iuula:r digit.a.l pattern (e.g.. all rcros). N1:3C c~hannel 220 may comprise 64 chips, and cacb half-slot nsay corxiprise 1 01-4 cliipfi. Ttitifi_ only a small fraction {e,g." 96r l t)~~?4) of the available fo"varci IiiYk powc:r is allotted to tlio pilcyt cfiwYZicI iri sucli systenYs, As a rcsult. TOA
m~~~surcrnerii based oai stacli pilot e;lianne1,may be su;ceptible to errors 4C.g_ Pa:17t-ie; 1,111a~
%A,-hcn tlie forward lisik- c.hmnel conditions are poor), heiicc, coriiprorliising the accuracy and reliabilit~ of associated position location. A need ihcrefore exists for a sÃr~~~g arrcl clcar si~.~U4l to assist position lcycation.
10024J Enibodiments discloseci hcr-eii7 relate -to inethocis and systcrns for providing iarlprovedJ'0A ineasurenscnt and en11ariced position loc.citiosi M. wireless communication svstema, (M'55] In an embodimer#t. wY AP rnay ~epIace normal inf:cyrÃzlation l,e,g., elat:r) traixynxission by a "known" Ãrarismission (temied "refcrencc t.ransmis;yion"
fierein) at a p:rcdeteriiiii1ed #.inie kr~o-,Nn to ATs in sectors ser~~iced b\,~ the At'.
1'hc Al.'s:1i1v tisc the received retererice transmission to assist or facilitat:e positioii l~.~catioÃ-i 4e.g., I'OA and/~.~r other position-Iocation Tlie, AP may aJso sezid zi reference t.ransmissiOD
oi7 dcrnand, e.o._ in rcypoi7sc to a rcquest fro.m an A"T' (N~,hie:h may h+;
in i7cc(i for a ]CyccltlC?31-bwsud 8e1vEcL-':)..
(ttÃ)261 In sori~~ embodi~~~crita. ÃE-ie refe-retic.e trwysnuasiorr i~~a-,: iÃ-iclcide a time slot .~avii~~
zi l~.ilot ;:wi-ia1 and a refercnce sik;llt31 iD a for.i~iat, ID other embodiments, the reference tr~,~nsmission mav incltrdc a tia-nc slot htiY.4t~g a pilcaà signal and tt rel:erc:nce> in a code-dh.-isio:ti-:nlulti.~.~lc:wd. l:ormat. 'T'he reference si~rial ma~ be siii-iilar or substantially identical to the pilot, stich that the entire time slot is nearly filled wit1-i the taalczi:, thereby larrso:itli.riLs a Arrsri#Y signal for TOA zuid t>the.r positirs.n-IocatiOD
rixe~~suremelxt.s. '1'(xe rcfi'renc.e s.iL, ~na( anat' aIsca he difFe:rerit fronx the pilcat, e.g.
,..
co:nÃigured to assist the piliià in piasiÃion location. 'l'lu: ensuing d:e:scriptioii. provides furti'ier ei~aibodii~aiei~ats and ea.amples.
100271 Tlie te.rin "refo.renc;G signal" ddisclosed hcreln mav inc:ltide :iriz Si#YDIRJ tlUtt i;:
:nrrtodulateci carrt im; rto w.['orrnation or data) and known to a receiving AT. For e:\aanpler the relerence si~niil n1ay comprise a digital pattern (e.g., a setltjciicc: ol.' syintaols) that is .:knoi.vn" in advance to the: resei~ing AT, N%f~ercbe the AT does riot need trs decode t1iG rcterence SiAYDIRJ. The rOtereDCe 1~1av c~trrv a Lti-iitltie s wc.tor ID (G.AY...
~t~reac~ ca.itt) a gas~~tad~~r~ric~t>a~i t~'N.1 c~}de ~~:itti a tiriitlL~c c~f:t~~t s~~ecil.~c. ita tt~~~ seetc~r}. Tl~c reference signal ma-v be tran.smitted at substantially the maximum power available tt} the sector (or :.['ull sector polver'.,), iri sc:+irie eirrtaodinierits, the reference signal may be a slsrn, d-staectiurn oi- other wielebanci signal (e.t~, tc) occupy the eritire traffic channel). A
::referent;e tratismissiorl" cliscloseci herein may refer to a forward link irans7-nissic3n including a referen.ce signal. FtÃrtl~er, the term. '.position-location Ineasu'ensent- may broadly refer to ameasureit-teitt associated with position location, includin~F (bcit not liiYiited to) TOA.. ÃiÃiie dit-fereriev of arrival (TDf) A), angle o.{~
arrival (AOA), advanced I:or~-var-d link trifiater1ition (At~'l."T')s enhanced c3byervecl -time clafferei7t;e (EO"T'T?), and oiliers, (ttÃ)2~~ Various aspects, features, and enil.~odi~ie-nts are described in turther detail l~~lcy~~.
(ÃlÃin] 1"ICi-. 3A illustr-at+;s an ea-nhcaclia-nei7t of arel'er-enc:e tratismissican including a time slot 300. NN.-lrichn1a.1 be tisecl to iniplon-ient soir~e disclosed embc}din1ents. Tinie slot 300 is shoi:~.-n in t:Nvo half-slots, each .~aviiig pilot channel 3 10. M=1Ã., channel 320.. and traffic chalrnel 330 in a Eorrliat. Pilot channel 310 carri~.as the pilot.
Pilot t;k~iannel 3101ind :NMAtr channel 320 may for example be S bstanÃially ias descrihcd above vv~ith respect to the em.bocliyn.e>nà of R.G. 2. Traffic channel 330 carries a rc:ferc:nce signia1, iit liett of clata.
Ici some Ginlaodiinenis. the reference signal irtay. be similar or substantially identical to ihe pilot7 as tia-ne slot 350 of 1".ICi-. :>Biflustr1ites, As a result, the entire slot 3,4;Ã3 is ncarlv f:illed vv~ith the pilot, as graphically illu5tnated 1~v the Natche>d area in the li9t$re, and the 1'cill power of the entire sector may be substantially devoted to the pilot trananuissaon dormL, tliis tn-nc perit~<l. This stA~t>~~g l~.ilot alloN.~>s Ã.1~~. rec:Gi~~ixi~; ATs to ~:~~~rrti~
0111nxOW, aCc rate ariil reliable TOA and other pc?s:itif>n-lE~cai.ion measurenxeniy. '.t-1:~e tiniing and si~naling for stsch :pi1ot slot" may :for c::rmrnpl.e be accordun I to the brc}aclca:sÃ/rixulticasà sliarinel sÃrticttjre M a 1xEV-DO tvpe s,:fit~in as specified in tlie BCMCS slaecit:lcaÃirs.n). FLirÃ.lier, inaplementati<an of s c:h 'lailot slt>t'' imposes ITl#.mme3.l changes C[? C13o etil.s~Ã]:tlg t~i ÃtbC)rl; .ltlfrilti#.rEli Ctl.r~'S e1t~C~ devices.
1110311 In other embodiments, the reference si~nal niay 1:?e different fr.iani the pilot. 'T'he ti.ininganCI si~;na.ling for tlle reference t:canfizraission may ior e,.wraple be according to ttie:
kxroadcastiiyiuliict3st channel structure i.ri a 1xEV]13O type s'y;tem (C.";., zi.s specified iD
tlio f3C'Mt~'S 's'Fac:Ã:if-icatac3tt). In one emlioditnent, .Ãtar oN<uyiple, the fiilt>i may e.c3rripfi4e a seclÃience of symbols having all zeros t;t3's3, %A~here.ws the reference sh4nal may cosilprise aseqt:ierice of fivriibols 'havin~ all ones ln another embodiment, the pilot may r::orrtpri}e the pilot symbols USerl. iri a lxU.V-D~} Ãypo system, NvIier~4-~4 tfto rcf'ereÃice signal t~n.ty co7nprise tl~e pilot symlat3lS ttsOci in ati l.S_95 type ,ysteni. In vct another embodiment, the pil~-~~ r~~a-v comprise a particular sequence of symbols, the reference sUgnal May comprise ilie, sequence configured in reverse. In ati aliernaÃiVe cÃiil?oclii-tYertt, atnowr# data. packet may be t.rwistYiitt~d &s tlte referer#ce si;;-i~al. e. ;., using the l~r c~<~cic a~t:'nxtÃItit ~ast c1iannel structure and signa]ing in a 7 x1:V-i3[~~ type system (e.g., -is sl}eciie.d in the Bt; ~,~~CS s~eciliccition). A recetving A'i' may Ãtse tlsis reference signial tt.~ search for Ãhe (~~~eal:ei~) pilot, estimate 1"0:1 (and/or l.~erlomi rstlier poaition=
lOeaÃjOtY report back tlic rrteastarecl inf'ormatiort.
(#lÃi32] In an embodi~~entn the reference transmission mav be carried otit bv aix AP
according to a predet.emii~ed selledtle o1i a regular or perioclic basis), so that at know n t:irnes, :1'-('s in the t;.orresportditig sectors may be prepared to l.~erlorn~ TOAand/rsr other position-:lc?eatiO.t7 rnGaS re:.iIrerAs, trrid report back the measured intormat.Ãort.
10033:1 In ian embodiment, an AÃ' a~~ay ~am oxit the rel:erenct' transmission on flt'rnand, e.g_ ttl.~oti receiving tt request fr~~tn ~tai P~'~t' {~rl~icl~ t'~~t~~ l~u in need for t~. l~~~.~t~tiiay~-bas~::cl service), If.w4l Ici atx emlxxliment, ati AP may make t;isc of idle slots for rGlereticc tratislili;:s:Ã011 (~. ., I.iling :niclle slot substantially wi-tlx tlie piltyt, such a.~
clescribe(l above witlx respect to iliu embodiment of F1t s. ')13,1, sO tis to make c1Ticietit use of the tit.twiar.l: resources, For example., the signaling associated wiÃE-i au.cli ttii-ic slot inay indicate to a receiving AT tlic rctGre.rtct. -,w.t-tal carried b-v the t.rtaic chaimel, so t1-iat tlie. AT nit3-y accordingly pet-fo.r.ni TOA antl: c?r other position-location me.ist7.rt'merrts.
IM351 l';lGS. 3A-M l:srt.xvi(le s~~~ne examples (?l.'transmiÃtu~tT a rc.terunct:. sitqnal alt.xaw tl'tu p ilot ita a tiine-rlt-~isi~~~~inulÃiplexerl foz-tnaÃ_ In other s,:5teins as spet:ifÃerl iri .Phvsical Lt3z-c.r Standard for cdmtt2000 Spec;irticii Svstems.'. 36PP~
C'.S0?002H1), Ve:rsiort 2Ø Segats:trikier 2E}E}5.. refo:rretl to as '-t~'DI11N2000 ix"
Itt.re:in.. or as specif:ied :in : Mobile: Station-Base SÃatio:n Compatibility Standard i:or Wiclebancl Spread Spe>ctrtini Cellular Systenxs." ANSIL"'Tf:VEMr95-k3-99, re9erre:l tc) as "IS-95" liereini, a reference:
mav be tt-ansrnittecl til<atig voth t1-ic p:ilrst :iri a ~rsc~G
tli~isit~r~rc~at~ltit~l~~G<l .(-t>rtnai..
~trc:l~ as described below.

S
J(H)361 11;1G. 4A illasti-atcs aÃÃ. embodiment of lorsvard link structure in the l:orrii of sector PmN-er Ã:Ãfiage Nfi, tiÃxle, such as in a~i IS-95 e}r t"DNlA20410 1x type systcn-a. Fc}"N-arc1 I inl;
r::haÃir#els, including pilot cIiarÃrÃe1 41 0, syric clYaÃiiiel 420, pkgdr#;:=
chaÃinel 43 W, asicl traffic channels 44t1s are transmittecà 'rtà a t;ocle-cÃiN isitiÃ~r-Ã~tiultiplex~.acÃ
ÃZ)rmat, each \vit}Ã a t;crtain fraction of tlic total sector posver. For e eampl.e, pilot channel 41() ma.y be allotted appr~.~xin-ia:te14' 15-209% of the maxinrcÃm sector power, denoted as RÃ=.,,-(max3. T~.~
awc_=.ilÃer#à the ailcyà (O>~.~., .{or pcÃsit:icyn location purposes}, soiiic or all o.{~tlYe power 4rllcÃÃiod -to traffic channels 440 may bc tÃseci to transmit a reference sigp7a1 (in lieu of infcarniation transmission) M. a specific perio d of tiÃtie, siÃc11 as Ãllasti'atcd in F1C3.
4B bclotv.
(4tÃ)371 For illustration and clariÃv. FIG. 4B depicts an eit-ib~.~cliÃÃieÃÃt in NNlÃich the power allotted to traffic chauÃiels 440 rrlay Y~~ SUbstwYtiallY dovoÃed to Ãr4-uismit a reference sign;Ãl 460 in a time slt?t 450. For emiÃnple_ such may tÃcctÃr in situations where an AP
sends a reference ti-arismÃasion to 1.1ie cc}rrespondin4.: Al.'s according to a predetermined schedule (e. tg., oÃ-i a r~gulv or l.,eri odicz.l l.~aais), so that at knoNN
Ãà tiÃÃies, the iA"I's may be prepared to pcrf_orÃri lositionHloc;ÃtioÃà aleasaarcrÃ7~.ants aÃ7cl report back the rÃlGaRÃre:cl iÃxforniatic3n. In scanic em1:ÃcÃdimeÃxts, the reference sigÃxal may he similar or substantially id.inÃical to the t.~ikw; as a result, tliu entire time slot 4,5Ã3 rnay be aiuttrlN filled with tllu l.~ilot, thereby providing a strong signal for }?rs5it:ic3ÃÃ-t-lpcaÃion ri~ea5cirement:s. In other GÃÃalarsÃ1_iÃÃaexÃts, the reference mt3.y :Ãl,w bG rlit'tereÃlà f:rrs.in the l~ilot, s~.Ãclà as tl~:~scril~~:.d al:ÃoY~ +;.
111038] In alternative eanbodianc.ws, tt l:racÃion of the pov,-er allotted to trai.'i:ic channels 440 ma.y be used to Ãrarisriut reference si;;ÃÃal 460 in time slot 450, For example., such cÃiav. t>ccrt.r in s.ituatiODs WIterG t3n AP carries t>Lat a re.(-'erexÃcc trt3m,,1Ã1issiiaxà iaxà tienixid.
in :r~spc?Ã:Ãfie to request(s) lrcÃnx one or nicare ATs in the co:rreypcÃa:Ãclin~; sectors (~vfiich ma~ be in need for posiÃion ].ocaÃion serv:icus).
(~~Ã)3(~~ In addition to replacing iÃXi-ormaÃion transmission iy a re.fcreÃXce transmifisÃon according to a predetermined schedule or on dc.inand (suclà as described abczo:e}.. a Po:rÃion of the c:orÃtro( channel the preamble), or other exi-,[irÃo; (or kxÃt>wn) s:igria.ls, n1ay be used to a.ssist t1ic pilot in position location. For exZmI.~le, in some systeans, th~, control clianÃXel mav be transmitted oÃi a regular or periodic ba:sÃs. TF~e preamble of t1'~~:
crs.i-ÃtrtÃl channel mav bG known to a rec;GivixÃg AT #~.~., z~J.'ter the initial setHtÃp}~ zti-itl therefoa=e, used to assist t:lie pilot in position locatic}n. (such as in a manner described abmoe iv:itix respect to Ãlaie refereIXSe stgrtal), (M401 FICi% 5 i:llt.tstt=atos a llcy,~~ diagjam of a process 500, which may l?e. t:isod to itTiplettlcttt sOtaie clisclosocl e taibci(iiments (stÃeslt as (lesct-ilaed ,ibove), Step 510 4t~ricra.t;':s a pilot signal and a reference signal, the reference signal comprising a sequence of svnibols Atiotvti to an access iermirtal. Step 52:0 transmits the pilot sitgrial and the ref'orence 4i:;rtal itY a titYio slot.
10041 J In process 500. ihe pilo-t signal and tltercl'et-ence sigt7al nxac be trarismitted in a time-divisiotl-mt.tltiplezed forsilat or code-division-multiplexed format, such as described a~.~ove. irt some embt.~cltinerits, the reterertce signal may be siii-iilar or substantially ielenÃit;:al tc) the pilot 4i:;rtal. In otlier emtaodimenÃs, tfto re.66,rotYce si~.~Ãi4rl MY bc differ-ent t:t-o.m the pilot sig.rtaln ~. ., Mxft~,I.ttred to assist the pilot signal in positio:ti location '.l"OA and otlier pos:it.ion-locatiori meast.trements}a such as described a~.~ove. Fttrtlier, M amt:tltia"rier ivireless crsrnti-it.$nicai:ion system, the time slot niav bG Ã:rttw-mlittGel ozi a subset (e.g., sort7c, all, or ztrtti contbi.rtation} of carriers.

100421 Fl.'~t. 6 illustrates a flC)w d1agritt'i of apl'C1Ge55 600, 3t'hlch mAil be E85i'~I to implement 5ortiu disclosed etnbctcjitric.nts (such as dt:scri:tsc;d abovu).
Process ti[?[? starts at sÃcp Ãiit}, Step 620 deterrtyirtes (e.g., based rsria predetermined sclreclttle},whether it is tHtie for cttrrving out a ref:Grt;iic~~. t.r:tnstnission to ATs iD sCcttz.ts se.rOt;Gtl bz- an AP. lf the otatcoa-nc of stt'p 620 is '-YI~:Sn" stel) 630follod~~s, atxd Sortetat:e<
a pilot si4~txa] and i :re:i:ercnce signal. 4te>p 640 transmits the pilot signal and the re.terunce signal in a tit-ne slot (e.g, in a time-divtsiot-t-mttltiplexed or crsd~rcli~.isi~tt ~ttt~ltiple~~cl forti-iat, such as dese.ribed above). St.ibscqtaently, process 600 rett;trns to step 620.

IM43:1 1.t3 process 600, if the C?t:B.tcf3l:ne of step 620 is ~iO," step 650 fE?llC?1v:i s'clt3d detc.ri-nitit:s il'theru is a request :for a lrycat:i(,m-lSa:sucl service fr(?y:ti ati. XF. If the iattÃcortiu cf step 650 is "'!'ES." process 600 rett:tm5 to step 630, il: the otatcc:+txte of step 650 is :.NO," step 660 tollm.~-s att(l proceeds witli i.txt<ar.t-natiot-t data) tr:tIi~111isI'lirsn.
Proct.~s 6Ã3Ã3 st~hs~tltt~:t~ila' :t~tt~.rt~: ic) step 620.
10044] FIG 7 illustrates a flov,:- diagram t.xf a process 70{3e ~vfiich may be trsed to irtxplement sot~a~e disclosed ertxbc}dirtxcrtts_ Step 71.0 rcce:i~ ~s a pilot sigtial and a referencc sigtttrl iD a titne slot {~.i~.. in a tiiiit;-ditasioii-Iiittlt:IplG:oe~d ur t:odc divisirs.tr-multiplexed format, sl.-cli as descri bed above). Step 7_30 pe.rfortns a position-location measrflreixient based on the pilot si-lu11 atiel the reforence: signal.

(fAW-51 Process 700 l"ilav fuTiher t#lc'l:lde SearcIll.TiÃ.~.~ fClr ti1o p3l(]t sl~õTI<.E.l. l#l sf}l"ile irlstane;es, tlic reference si4li<il may be :lilnilar or ;ubstarlti,illy identical to (l~e pilot signal, cffecovely providing a strong pilot for position-localion rl~:c~sl-r~s~l~s~ts. In t}ther instances, a receivim): AT Ã-~~av use the reference sigrial to search for the (o~~ea1:er) pilot, estiniaÃe, TOA (4-uici./Or perforrri other pcysitiori-1ocaticyÃi l-nCasuremenÃs). 4-uici report back-tlxe anca,~;ureci infcarni<ition, IM)=161 li'1.G, 8 illu=tratc~ a flozv diagram. of a process 800, %A.-h.ich may be tasecl to i~i-ipIemetit some disclosed eml:lrsclimetita (such as descri bed a1..~ove).
Process 800 starts at stcp gM Step 820 ror:.eiN-cs atinieslot bae inw ;:, alailoà r:.liar#iYC:l anrl. a reference channel (c. ., in a fr3rmAits yxit;h as described above), (lie pilot channel cara-xin) a pilot sigrial. Ste-p 830 determines if the traffic channel carries 1 reference signal, If the outcome of step 830 is "YES," stel.~ 840 t:rsllc~kvs and performs a 1ositirsiy-locat.ic?rl TOA) rnG~SUre:.me.nt based cYri the pilot ~sigmal and tfic re.(lcre:nc.e signal.
1'rcacasy 800stÃbseclUCrxtl.y retunxs to step 820. If the catrtcome of ytop 830is NO," step 850 l~:olloavs and proceeds with the traffic channel {~..~.. decode tliu (lattt packets carried bv the traffic chwynel). Process 800 subsequently ret:uma to step 820.
100471 FIG. 9 shows a bloc;.1 tiiagm~~i-i of ati alalaart3ws 900, which may be used to implement son~c disclosed erlxboflirlxcrlty (sticll <is described above). By Nvay of 900 , .
e:\aanpl~::_. appt~r.~ttlÃ.s l)tttt n~t~e . ~yic. rii ~, ar~..l~,r~.nc~.-ge>n~.rZtyng unit (or rlir.xdule) 910 crsrifigtired to generate a pilot signal wycl a reference signal, kNherein the reference signal crsmprisi.i-i#Y Zl. SGtI ence of known symbols to one or nrorc rGce:ivi.i-i#Y
ATsB; and a 'tr<m sMittincy urlit 930 configured to transa:nit the pilo-t s.igrla( and the refeacnce 4:igilal in a tinic slc?Ã. I.n. a multi-carrier systc:m, transmitting tsiiit 930 may be further cianiigtrre:d to trarasn-aià the tUrie slot oi~a a subset of c.tu7n'ers.
[COU] Appt3ratos 900 may also iiicl clc a MUltilalMD(; nit 920 c~iif:lgtirec;l to m Itiplex;
the pilot sivf~~.<~.l and tll~. r~~l';~r~:rlc:c signal iziic~ i~lt;~ ii~~~~:~
slot ~,.. i~~. a ti~~~~c~~-dia~.is:Ãc~~~r-rraultil:lle>\ed or codu-di.rision-multip.lexud i:on-nat. sricli as described abiave). ApparaÃus 900 may further iticlude a p.rocesSin,r uiiit (or controller) 940 sor~l~vr~:
~cd tc) control anc;l.:"or coordinate the operations <a.t'variou:: ti.ti.its.

J(H)=191 Apparatus 900 may be implemented in an AP (e. g... .kl' 106 in FIG.
1.). of other netivork :inlrastructurc cl~inenÃs.
(to5t)] FICi% 10 illustrates a block dia:;r:ani of ar# apparatus 1000, which rnay also be li;ecl to i7nplements scaayie disclosed eriibodiriierrts (sUt;h as dcseribeci alac3ve). F3~ \vay of exaarlple. apparalus 1000 arlay iiiclude a recciving rrrlit 7 tl1 t3 corifiõtÃrcdto. rccciveapilot signal atid a reference Sigmal in a tiit-te s1oà (e;g., iit a Eime-divisi onamultiple\ed or cod~~-dirision-niultiploxed forrriat, such as described above): wYd amea4urc:rrient wiit 1030 configured to per-form a positic3n-Icacation i.e.g., T[~~.A;1 mcasurement based on the pilot signal and the reference signal. Apparatus 1000 may further iiiclude a searcliing unit 1020, coi-itit) ~ured to search for the pilot aigÃial. .1p1-~arai:us lt}t)i.l may also iiicltide a proeessirig uriit {or controller) 1040, r::onE.it~~~ed to control and."Or coordinate the Operatic3ny Of various un.ity ltlÃl-m] Apparatus l t)t)t) may be implemen#.ed in an AI'. or other communication devices.
[t1tI5:1 Embodimeiyt:s disc.losed hereiri (such as described a.bove? provide some eiiiboeliri7erits for caliancing posiÃion location i.r~ ~.vireless c0r11i1n1rliCat.ÃOrls. Tfio.r~.a are o-llior embodiments and imp1ementatyons.
1(0)531 Embcyd.iment5 disclo5c.d hereun anay b~~ a.pplietj to amtÃlti-carrier ~~ireless c.ommunication systein. For example, a reference transmission may be setit on sonie, all_ or ~~i'v ct>rnlaixiatitrn of c:zlrriers.
(1lÃ64] Viariotas imi-ty/inoclxiles in FTC& 9-10 atid catl~er emhcacliments may be iniplc.~-neiitcd in fiardw'are:, soffivare, fir~iware>, or a combination therexaf. In a hardware im~.,lementatron, various tinits ma.y be ini~.,lenieiyted oOt:hin oiie or niore application SPeeific ~~~Ãe4~rated c:ir~;~;~ils {~.;SIt"'}.. di#Yit~~J. si ~~trl l~roc~.ssrz.~~ (]13~sP), di#Y.ital signal proccssing de4-ic~.~ {.l)S1':[)s), field pro;Yr.inua:nable gate ar#-ays t.l"'PGA}., processors, m.icroprocessor.s, conÃaolle:rs, anic,:rocosntrollurs. programnlable Io4qic devices (PLD), e}tller clectronic til~aiÃs, or am conxbination Ãliereof. ln a soffivare iiriplcn-wntat:ion, o ziri~~~~ p.r<acedures. .t'ianctioris, and srs ori}
t}tat per.('orri-I tbe.Ã' nc_tiarts described .liereiti. The so.('[ware codes may be stored in a meaniart.- unit aritj i:rectited ];?y a processor (r.xr tt processing uni.t).
'l'he> rncmo:r~' taiiit may be iinplcwaented within the processor or external tc) the t?rocessor, in i.k-liich case it can be co~~~~~tunicatively coupled io the processor via variou:: niewis knowri in theart.

jm)551 'I'hosc of skill in the a.r~ Awuld undcrsuvid that information aiid signals ma~, be repreSeiXted using -Lay of a varie-ty of di f[crent techriolc}-~e5 and techniques. For exanYple, ciata.. iiY4truct.ioris. cornzri4incis, iril.ornYafion. si~.~~Ws, bits, synibols, wci r::liips Ãliat 7nAiti be refore~i-it;c(i ÃIrrou4hotat the above description ri-iav be represented by vollage.s, ctar-rerlts. clecÃronnagp.ctic ~~~aves, magnetic fields or particles, optical l.'iclcls or parÃicles.. or axry com~.~inat:iori thereof:
Those of 4k.i11 ,-wuld furtlier apprcCiate i1~.4-~Ã tf~e VaricyUs illUStratiVe l0~4iCIl hlocl:sn mt?cluless circuits, iand a1gr3riffinx steps described in e:oi7i7cction -,vith Ãl~~
embodiments disclosed herein rila-v be implemenÃed as electronic bardware, computer soffivare, or co~ilbitiaÃions of boÃh. 'I'o clearly illusÃr,,at:e this interchwigeabiliÃy of lYardivare a~id Software. wuious illustrati~~ e corzipozicrits, blocks, rncadules.: circuiits, arid steps liave be+;ti deycrihed 1ibove generally in t+;rins of their functionality. Wliether strch functionality is inipleniented as hard-,N-are or software depeilds tiporl t.lle particular application aryc.l design constraints imprs5ec.l oit the overall system, Skilled arÃisOsis may irnpleine.nt tlie: dGscril'iGcl .(trncÃ:iorialiiy in ~vays.fior cacli particular application.
hxit strcli inxpleancwation decisions shotild not be ii7tcrpretcd ias ciausing a departure I:rc3m thc scope oÃ'the: present inve:ntic3n.
(ttÃ)5,71 I"I-~e various illustrative logical blocks, modules, and circuits described in connection with t1-ic ernb<adirnGnts disclosed herein inay be irnple:craerited <a.r perforr-ned 3vith a;;enera] pxirpoye proceysor, a digital signal processor (DSP), an application specific intrgratetj circiiit lAS1C'j, a i:iultj pragramniable gate array (FPGA) or other progr~~~~triable logic device, discrete gate or transistor logic, discrete hudware crsmporie.nts, or any combinati~ii thGreof dcsigxlcd to perform the ffincti<ans described hereiix. A general purpose processo.r may he a microprocessor, but in ihe.i.lt.erriativc_ the prot;e:ssor may 1?e any conveaiional processor, controller. niicrocontroller, or state machine. A processor n'iay also be: iiriplcnwriÃed as, a conxbination of c.oiriputirig dGvice:5, e.g., a. con-abInation of zi DSP wid amic.r<aprocessor. a plurality of .mic.roprc3c:cssors, one or 1-nt>re rnicaroprt>ce:sc3rs iri conjunction votli a DSP c:c~re. or ari"y otlicr sticli configurat:ion.
joÃ15131 The steps of a zraeÃlaod or al;;-orithiri described in connection Nvit:h the embotlimeras disclosed lICrCiD n-aay be embodied dircc-tly iD hardware, iD a so.t'iA~:t3re module execuis d by a prt>ce:sc3r, or in a c;onibi.natit>n of the t.wo. A
software rnt>cl lc ]i may reside in random access memory (R-AM), flash n1ernorv, read only me.mm (ROM), efed:zically progranunabfe l:tf3N-1 (EPROM), electrica.lly era.sable pre}urrwru~aiatale ROM (UEFR(3N13. regisÃers.: tiard disk, a romovable clisk.. a CD-ROIXI, or wYv otiYer torm oÃ'storAi4=e meditrtii ilie art, Ai~i exemplAiry stora~~Ciriedi a1i is e;0U[)l0ci (c) thC
processor st 11 ilie processt>r Can read information I'rorii, wid Nvrite inR,)rnration to, ihe si:ora,ge mediun-i. In the aItemaÃive, the storage niedium maN. be iriÃegral to the processcyr. The processor wid the siorage iiiecliLiÃii rr~ay f-eside in wi :tSI~,, The ASIC
may reside in an AT In the 1ilternaiive, the processor aixd the storage meditim n~a Y
reside as discrete consposieriis inan AT.
(ttÃ~~c~~ .I"E-ie previous description of the disclosed ~n-ibrsdimenia is provided to enablemy person >kil:led iri the af-i to ~-ni3kv c~~- use ifio present inverition.
Various modificaiiOzis to these embodimenÃs will be readily ~~parent to tlic3ye skilled in the 1irin ind the generic pr.inciplea defined IZerein n1~~ be applied to other eiiibodiiiiei1ts avithoÃ.at departingI'rom the spirit or scope of the inventirsn. Thus~ the present invention is iioi ini:erided to be linuted to the erxibodirxiez*s shoz~~ii herein bui is to bG accorde:d the N-vidGsi scope consa;tent -,vith the principles1ind nov+;l features disclosed hereiai.
1(9)601 WHATiS CLA1'41E~1) LS:

Claims (32)

1. A method for wireless communications, comprising:
generating a pilot signal and a reference signal, the reference signal comprising a sequence of symbols known to an access terminal; and transmitting the pilot signal and the reference signal in a time slot.
2. The method of claim 1, further comprising time-division-multiplexing the pilot signal and the reference signal in the time slot.
3. The method of claim 2, wherein the time slot includes a pilot channel time-division-multiplexed with a traffic channel, the pilot channel carrying the pilot signal and the traffic channel carrying the reference signal.
4. The method of claim 3, wherein the reference signal substantially occupies the traffic channel.
5. The method of claim 2, further comprising transmitting the reference signal at a maximum power.
6. The method of claim 1, further comprising code-division-multiplexing the pilot signal and the reference signal in the time slot
7. The method of claim 1, wherein the reference signal is substantially identical to the pilot signal.
8. The method of claim 1, wherein the reference signal includes a sector ID.
9. The method of claim 1, wherein the reference signal is transmitted in accordance with a predetermined schedule.
10. The method of claim 1, wherein the reference signal is transmitted in response to a request from the access terminal.
11. The method of claim 1, further comprising transmitting the time slot on a subset of multiple carriers.
12. A communication structure, transmitted on a carrier wave, comprising:
a pilot channel carrying a pilot signal; and a traffic channel carrying a reference signal, the reference signal comprising a sequence of symbols known to an access terminal.
13. The communication structure of claim 12, wherein the pilot channel is time-division-multiplexed with the traffic channel.
14. The communication structure of claim 12, wherein the reference signal is substantially identical to the pilot signal.
15. The communication structure of claim 12, wherein the reference signal includes a sector identifier.
16. An apparatus adapted for wireless, communications, comprising:
means for generating a pilot signal and a reference signal, the reference signal comprising a sequence of symbols known to an access terminal; and means for transmitting the pilot signal and the reference signal in a time slot.
17. The apparatus of claim 16, further comprising means for multiplexing the pilot signal and the reference signal in the time slot in one of a time-division-multiplexed format and a code-division-multiplexed format.
18. The apparatus of claim 16, wherein the time slot includes a pilot channel and a traffic channel, wherein the pilot channel carries the pilot signal and the traffic channel carries the reference signal.
19. The apparatus of claim 16, wherein the reference signal is transmitted in accordance with a predetermined schedule.
20. The apparatus of claim 16, wherein the reference signal is transmitted in response to a request from the access terminal.
21. The apparatus of claim 16, wherein the means for transmitting is further configured to transmit the time slot on a subset of multiple carriers.
22. A method for wireless communications, comprising:
receiving a pilot signal and a reference signal in a time slot, the reference signal comprising a sequence of symbols known to a receiver; and performing a position-location measurement based on the pilot signal and the reference signal.
23. The method of claim 22, wherein the time slot includes a pilot channel time-division-multiplexed with a traffic channel, the pilot channel carrying the pilot signal and the traffic channel carrying the reference signal.
24. The method of claim 23, further comprising identifying the reference signal carried by the traffic channel.
25. The method of claim 22, wherein the pilot signal and the reference signal are code-division-multiplexed in the time slot.
26. The method of claim 22, further comprises searching for the pilot signal.
27. The method of claim 26, wherein the searching for the pilot signal is based on the received reference signal.
28. The method of claim 22, wherein the reference signal is substantially identical to the pilot signal.
29. An apparatus for wireless communications, comprising means for receiving a time slot having a pilot channel and a traffic channel;
and means for performing a position-location measurement based on the pilot signal and the reference signal.
30. The apparatus off claim 29, further comprising means for searching for the pilot signal.
31. A method for wireless communications, comprising:
receiving a pilot signal and a portion of a control channel; and performing a position-location measurement based on the pilot signal and the portion of the control channel.
32. The method of claim 31, wherein the portion of the control channel includes a preamble.
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