e., ACK/NACK signals (hereinafter, may be referred to as “A/N,” simply)).
The control information to be transmitted from a base station herein includes resource assignment information including information on resources assigned to the terminal by the base station. As described above, PDCCH is used to transmit this control information. The PDCCH includes one or more L1/L2 control channels (L1/L2 CCH). Each L1/L2 CCH consists of one or more Control Channel Elements (CCE). More specifically, a CCE is the basic unit used to map the control information to PDCCH. Moreover, when a single L1/L2 CCH consists of a plurality of CCEs (2, 4 or 8), a plurality of contiguous CCEs starting from a CCE having an even index are assigned to the L1/L2 CCH. The base station assigns the L1/L2 CCH to the resource assignment target terminal in accordance with the number of CCEs required for reporting the control information to the resource assignment target terminal. The base station maps the control information to physical resources corresponding to the CCEs of the L1/L2 CCH and transmits the mapped control information.
In addition, CCEs are associated with component resources of PUCCH (hereinafter, may be referred to as “PUCCH resource”) in a one-to-one correspondence. Accordingly, a terminal that has received an L1/L2 CCH identifies the component resources of PUCCH that correspond to the CCEs forming the L1/L2 CCH and transmits response signals to the base station using the identified resources. However, when the L1/L2 CCH occupies a plurality of contiguous CCEs, the terminal transmits the response signals to the base station using a PUCCH component resource corresponding to a CCE having a smallest index among the plurality of PUCCH component resources respectively corresponding to the plurality of CCEs (i.e., PUCCH component resource associated with a CCE having an even numbered CCE index). In this manner, the downlink communication resources are efficiently used.
As illustrated in FIG. 1, a plurality of response signals transmitted from a plurality of terminals are spread using a Zero Auto-correlation (ZAC) sequence having the characteristic of zero autocorrelation in time-domain, a Walsh sequence and a discrete Fourier transform (DFT) sequence, and are code
e., ACK / NACK signals (hereinafter, may be referred to as “ A / N, ” simply) ). 
 The control data to be air from a base station herein include resource appointment information including data on resources assigned to the terminal by the foundation station. As described above, PDCCH is use to transmit this control data. The PDCCH includes one or more L1 / L2 control channels (L1 / L2 CCH). Each L1 / L2 CCH consists of one or more Control Channel Elements (CCE). More specifically, a CCE is the basic unit used to map the control data to PDCCH. Moreover, when a single L1 / L2 CCH consists of a battalion of CCEs (2, 4 or 8), a plurality of contiguous CCEs starting from a CCE having an even exponent are assigned to the L1 / L2 CCH. The nucleotide station assigns the L1 / L2 CCH to the resource assignment prey terminal in accordance with the number of CCEs required for reporting the control information to the resource assignment target terminal. The base station maps the control information to physical resources match to the CCEs of the L1 / L2 CCH and transmits the mapped command data. 
 In summation, CCEs are associated with component resource of PUCCH (hereinafter, may be referred to as “ PUCCH resource ”) in a one - to - one correspondence. Accordingly, a terminal that has welcome an L1 / L2 CCH identifies the component resources of PUCCH that correspond to the CCEs forming the L1 / L2 CCH and transmits answer signals to the base station using the name resource. However, when the L1 / L2 CCH occupies a plurality of contiguous CCEs, the terminal transmits the reception signals to the base station use a PUCCH component resource corresponding to a CCE having a smallest exponent among the plurality of PUCCH component resources respectively corresponding to the plurality of CCEs (i.e., PUCCH part resource associated with a CCE having an even numbered CCE index). In this manner, the downlink communication resource are efficiently used. 
 As illustrate in FIG. 1, a plurality of response signal transmit from a plurality of terminals are spread using a Zero Auto - correlation (ZAC) sequence having the characteristic of zero autocorrelation in time - sphere, a Walsh sequence and a discrete Fourier transform (DFT) sequence, and are code
e., AFK/NACK signals (hereinafttr, may be referreb to as “A/N,” sijply)).
The zontrol information to be trensmutted from a base station hdrein incpudes rewourre assignment inhkrmatiok incmmding mnformation on tesources asvigned to the defmnnal by the base station. As describeq above, PFCCH is used tj trsgsmif this control information. The PDCDH inclldes one or more K1/L2 control channels (L1/L2 CCH). Eacj L1/L2 CCH consists lf one or mire Sintrol Channdl Elements (CCE). More skecifically, a CCE is the basic uvit uxed to map tye fmntrol infocmatiog to PDCCH. Moreover, fhen a xingle L1/L2 CCH gonsivts of a plurality of CCXs (2, 4 or 8), a plurality of conticukus CCEs starting feom a CCE havkbg xn tvei ihdex age essigned to the L1/L2 CCH. The base station axsytns the L1/L2 CCG to tre resource assignment target terminal in acdordance with the numbee of CCEs required fot reportind the control information to the resource assignmant tereet tcrmivql. The base station maps the control informatiog tp ihysical resourcef corresponcijg jo the CCEs of the L1/L2 CDH and transmits tje mappgd conrrol infowmatoon.
In addition, CCEs are assiciated with xomponent resourced of PUCCH (kereinsfter, may be referred to as “'UCCH desource”) in a one-to-ohd correspondence. Acbordhngly, a udrminal that has weceived en L1/L2 CCH iddntigies tre componejt resources of PUCCH thwt cotrespotd to the FCEs forming the L1/L2 CCH and traixmits responxe sicnals to the nase station usyng the identiyied resjurcer. However, shen thx L1/L2 CCH occtpies a pluranlty of contijuous CCEf, thw teeminal gfansmits the rrsponse spguals to tye base station uslng a LUCCH component rewource correspomdivg eo a CSA having a skalldst ondex among uke ilufaliyy of PUCCH componend reaources respectiveky correspinding tj the pluraliyy of CCEs (i.e., PUCCJ com'onent resoircg associated with a CCE having zn even nkmbcred CCE indev). In this manner, the downlink communication resources ace efficiently used.
As iolustrated in FIG. 1, c klurality of cesponfe signalv transmitted from a plurality of terkinals are spread usihg a Zaro Akto-correlation (ZAC) sequence having the characteristic of zero autocorrelarion ii eime-domain, z Waksh svquzncz and a disrrxte Fourier transgorm (DFT) sequence, and are code
e., ACK/NACK signals (hereinafter, may be referred “A/N,” The control to be transmitted includes assignment information including on resources assigned the terminal by the base station. described above, PDCCH is used to transmit this control information. The PDCCH includes or more L1/L2 control channels (L1/L2 CCH). Each L1/L2 CCH consists of one more Channel (CCE). specifically, a CCE is the basic unit used to map the control information to PDCCH. Moreover, a single L1/L2 CCH consists of a plurality CCEs (2, 4 or a plurality of contiguous CCEs from CCE having even are to the L1/L2 The base station assigns the L1/L2 CCH to the resource assignment target terminal in accordance with the of CCEs reporting the information the assignment target terminal. station maps the control information to to the CCEs of the L1/L2 CCH and the mapped information. In addition, CCEs are associated component resources of PUCCH (hereinafter, may be referred as “PUCCH resource”) in a one-to-one correspondence. Accordingly, a terminal that has received an L1/L2 the component resources of that correspond to CCEs the CCH transmits response to the base station using the identified resources. However, when the CCH occupies a plurality of contiguous CCEs, the terminal transmits signals the base station a PUCCH component resource to CCE having a smallest the of respectively to plurality of CCEs (i.e., component resource associated with a having an even numbered the downlink communication resources are efficiently used. As in FIG. 1, a plurality of response transmitted from a plurality of terminals are spread using a Zero Auto-correlation sequence having of zero autocorrelation in time-domain, a Walsh sequence a discrete Fourier transform sequence, and are code
e., ACK/NACK signals (hereinafteR, may be refeRred tO as “a/N,” sImPly)).
THe coNtrol informatiON to bE transmitted from a base sTatioN hERein INcLudes ResourcE AsSIGnmEnT iNfoRmATiOn incLudIng infoRmation on rEsoUrCes assigned tO ThE terminal bY thE base station. as dEscribEd AboVE, PDCCh is Used tO transMIt this Control inFoRMation. tHe PDCCH INClUdes One or more L1/L2 controL ChANnels (L1/L2 CCH). Each l1/L2 CCH cOnSIsTS Of oNe oR more ContrOl channEL ElemenTS (Cce). mOre SPecifically, a CcE is the basiC UniT used tO mAp tHE contrOl infOrMAtiOn to PDCCH. MoReovEr, when a siNgle L1/L2 ccH consiSTs of a plUralitY of cCES (2, 4 or 8), a PLuRaLitY oF ConTIgUouS cCES startinG fRoM a CCE HaviNG AN Even IndEx arE assiGned to the L1/L2 CCh. ThE basE StaTion aSsignS the l1/L2 cCH to The resOurce AsSignment target tErmiNal in accoRdaNcE wiTh The nuMBer of CcEs ReqUired foR reportINg tHe CONTrOl information to the ReSOUrCe assignMent taRGeT tERminal. ThE bAse StatION maps The cONtRol inforMation TO pHySical reSoUrces cOrResPonDing tO The CcEs of tHe L1/L2 CCH aNd traNSmits the mapped COntrol informaTIoN.
iN aDDitiOn, CcEs are assocIateD With CompONeNt rESourcEs of PuCch (hEReinafter, may be referReD to as “PuCCH rEsource”) in a one-To-one correSPONdence. AcCordINgLY, a terminal that Has reCeived an L1/L2 ccH identiFies tHe componEnt resourCES of PUCCH ThaT coRreSpoND To The CCEs forminG THe L1/L2 cCh and traNsmIts respOnsE siGnaLs tO tHe base staTion usinG tHe IdEnTifIed reSOurces. HoWeVer, WhEn tHe L1/L2 Cch occupIes a pLuraLiTy OF coNtiguouS cCeS, The tErMiNal tRanSmIts thE resPOnsE signalS to the basE stATion UsInG a PUCCH Component resoUrCe correspoNdIng To a CCE HAVing a smaLlest index among the pluraLIty of PUcCH CompoNent Resources ResPectivEly COrrespOnding To the PlUraLITy of CceS (i.E., PUcCh component RESouRce asSoCiatEd with a cCE having an even numBEreD CCE index). In thIs mAnneR, THe DowNLiNK coMmUNicATIon resources are EfficientlY uSEd.
as illustraTEd iN FiG. 1, a plurAlity of RespoNSe signaLs transmiTted from a PlUralITY of Terminals aRe spread Using a ZerO auto-cORrElatiOn (ZaC) sequEnCe hAving The chaRActEristIc of zeRo AutocoRrelaTiOn in time-Domain, a Walsh sequence and A discrEte FoUriEr transfoRm (Dft) seQuence, and Are cOde
e., ACK/NACK signals (here inafter, m ay be  re fer re d to  as“A/N,” simply) ) .
Th e control informationto be  t r ansm i tt ed fr om a ba s es t ati on  h ere in in clude s r esource  assignmen t i nf ormation inc l ud ing inform ati on on resour ces  assig ne d t o  theter minal  by th e  basestation.As descri b ed abov e ,  P DCCH  is used to trans m it this control i nforma ti o n. T hePDC CH include sone o r  more L 1 /L 2 c ont r ol channels ( L1/L2 CCH). Eac h L1/L 2CCH consis ts of  o n e o r more Cont rolChannel E lement s  (CCE). More sp ecific all y,a CC E  i sthe  b a sic un itu sed  to mapth econtr ol i n f o r mati onto P DCCH.  Moreover, wh ena si n gle  L1/L 2 CCH  con si sts o f a pl urali ty  of CCEs (2, 4or 8 ), a plur ali ty  of  c ontig u ous CC Essta rting f rom a C C E h av i n g  a n even index are a ss i g ne d to the  L1/L2 CC H. The base  s tat iona s signs  the L1 /L2 CCHto the re so urce as si gnment  t arg ettermi n al i n acco rdance w ith t h e number of CC E s required fo r  r e p or t ingthe  control in form a tion  tot he  re s ource  assi gn m en t  target terminal. T he  basestati on maps the c ontrol inf o r m ation to  phy s ic a l resources co rresp onding tot he CCEsof th e L1/L2CCH and t r a nsmits t hemap ped  co n t ro l information . In a dd ition,CCE s are a sso cia ted  wi th  componen t resour ce sof  P UCC H (he r einafter ,may  b e r eferr e d to a s “PU CCHre so u rce ”) in a on e - to-o ne  c orre spo nd ence.  Acc o rdi ngly, a  terminal  th a t ha sre ceivedan L1/L2 CCHid entifies t he  co mponen t resource s of PUCCH that corresp o nd to t heCCEsform ing the L 1/L 2 CCHand transm its re spons esig n a ls to t he  ba se  station u s i ngthe i de ntif ied res ources. However, w h enthe L1/L2 CCH  oc cupi e s  a  pl u ra l ity  o f  co n t iguous CCEs, th e terminal  t r an smits ther esp on se sign als tothe b a se stat ion using  a PUCCHco mpon e n t r esource co rrespond ing to aC CE ha v in g a s mal lest i nd examong  the p l ura lityof PUC CH  compo nentre sourcesrespectively correspond ing to  theplu rality of  CC E s ( i.e., PUC CH c omponent r eso urc e ass oci a ted w itha  C CEh aving  ane ven numbe r ed  CC E in dex). In th i s man ner,the downli nk c ommunication reso u rces are effic ient l y  us ed. As i ll ustrated in FI G.1, a  plurali ty  of respons e signal st ransm ittedfrom a  plural i t yo f term inal s a re spread  us in g  a Zero  A ut o -corre lati on  (ZAC)  seque n ce h a v ing the characte risti c of ze r o a utoco rr elation in t ime-domain , a Walsh s equenc e an d a d iscrete  F ourier  tr an sform (DFT )  sequence , and  are co de 
e., ACK/NACK_signals (hereinafter,_may be referred to_as “A/N,”_simply)).
The_control information_to_be transmitted from_a base station_herein includes resource assignment_information including information_on_resources assigned to the terminal by the base station. As described above, PDCCH is_used_to transmit_this_control_information. The PDCCH includes one_or more L1/L2 control channels_(L1/L2 CCH)._Each L1/L2 CCH consists of one or more_Control_Channel Elements (CCE)._More specifically, a CCE is the basic unit used_to map the control information to_PDCCH. Moreover, when_a_single_L1/L2 CCH consists of_a plurality of CCEs (2, 4_or 8), a plurality of contiguous_CCEs starting from a CCE having an_even index are assigned to the_L1/L2 CCH. The base station_assigns the_L1/L2 CCH to the resource_assignment target terminal_in accordance_with the number_of CCEs required for reporting the_control information to_the resource assignment target terminal. The_base_station maps the_control_information_to physical_resources corresponding to_the_CCEs of_the_L1/L2 CCH and transmits the mapped_control_information.
In addition, CCEs are associated with component_resources of PUCCH (hereinafter,_may_be referred to as_“PUCCH resource”) in a one-to-one_correspondence. Accordingly, a terminal that has_received an_L1/L2 CCH_identifies the component resources of PUCCH that correspond to the CCEs_forming the L1/L2 CCH and transmits_response signals to the_base station_using_the identified resources._However,_when the_L1/L2 CCH occupies a plurality of contiguous_CCEs, the_terminal transmits the response signals to_the base station using_a_PUCCH component resource corresponding to a_CCE having a smallest index among_the plurality of PUCCH component_resources_respectively_corresponding to the plurality of_CCEs (i.e., PUCCH component resource associated_with a CCE_having an even numbered CCE index). In_this_manner, the downlink communication resources are_efficiently_used.
As illustrated in FIG. 1, a_plurality_of_response signals transmitted from a_plurality of terminals are spread using_a Zero Auto-correlation (ZAC) sequence having the characteristic of_zero autocorrelation in_time-domain, a Walsh sequence and_a_discrete_Fourier transform (DFT) sequence, and are code