PCI Planning and PCFICH Consideration in LTE
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PCFICH spans four (4) locations across the bandwidth and are equidistant. The location of 4 REGs of PCFICH depends on PCI and system bandwidth But PCIs are 504, so cells with different PCI are bound to have overlapping PCFICH locations. Hence we see two scenarios arising, first a set of PCIs for a given bandwidth will have exactly same PCFICH positions and secondly a group of cells that have one or more overlapping PCFICH locations. If the PCIs within a set happens to be assigned for neighbor cells, the UEs at cell edges will experience interference while decoding PCFICH. Any problems in reading PCFICH leads to a situation where UE is not reading either or both PDCCH and PDSCH thereby reducing the cell edge throughputs. write to [email protected] for macro enabled excel sheet.
Transcript of PCI Planning and PCFICH Consideration in LTE
PCI planning considering PCFICHEnable macro in Excel Options
and enjoy tool.PCFICH spans four (4) locations across the bandwidth
and are equidistant. System BW [MHz]selectThe location of 4 REGs of
PCFICH depends on PCI and system bandwidthPCIIt is not recommended
to have following PCIs in neighbour cells for PCI in 'column
A'for20MHzBut PCIs are 504 (five hundred and four), so cells with
different PCI are bound to have overlapping PCFICH PCFICH
subcarriers Partial Overlapping PCIsPCFICH subcarriers Full
Overlapping PCIslocations. Hence we see two scenarios arising,
first a set of PCIs for a given bandwidth willhave exactly same
PCFICH positions and secondly a group of cells that have one or
more 050100150200250300350400450500overlapping PCFICH locations. If
the PCIs within a set happens to be assigned for neighbor
151101151201251301351401451501cells, the UEs at cell edges will
experience interference while decoding PCFICH. Any problems
252102152202252302352402452502in reading PCFICH leads to a
situation where UE is not reading either or both PDCCH and
353103153203253303353403453503PDSCH thereby reducing the cell edge
throughputs.454104154204254304354404454555105155205255305355405455Description1.4MHz3MHz5MHz10MHz15MHz20MHz656106156206256306356406456Number
of RBs615255075100757107157207257307357407457Number of
REGs123050100150200858108158208258308358408458Partial Overlapping
of REGsNoYesYesNoYesNo959109159209259309359409459PCI separation for
partial
overlappingNA7/812/13NA37/38NA1060110160210260310360410460Full
overlapping of
REGsYESYESYESYESYESYES1161111161211261311361411461PCI separation
for Full
overlapping315252575501262112162212262312362412462136311316321326331336341346314641141642142643143644144641565115165215265315365415465166611616621626631636641646617671171672172673173674174671868118168218268318368418468196911916921926931936941946920701201702202703203704204702171121171221271321371421471227212217222227232237242247223731231732232733233734234732474124174224274324374424474257512517522527532537542547526761261762262763263764264762777127177227277327377427477287812817822827832837842847829791291792292793293794294793080130180230280330380430480318113118123128133138143148132821321822322823323824324823383133183233283333383433483348413418423428433438443448435851351852352853353854354853686136186236286336386436486378713718723728733738743748738881381882382883383884384883989139189239289339389439489409014019024029034039044049041911411912412913413914414914292142192242292342392442492439314319324329334339344349344941441942442943443944444944595145195245295345395445495469614619624629634639644649647971471972472973473974474974898148198248298348398448498499914919924929934939944949950010015020025030035040045050051110115120125130135140145150152210215220225230235240245250253310315320325330335340345350354410415420425430435440445455510515520525530535540545556610615620625630635640645657710715720725730735740745758810815820825830835840845859910915920925930935940945960101101602102603103604104606111111161211261311361411461621211216221226231236241246263131131632132633133634134636414114164214264314364414464651511516521526531536541546566161161662162663163664164666717117167217267317367417467681811816821826831836841846869191191692192693193694194697020120170220270320370420470712112117122127132137142147172221221722222723223724224727323123173223273323373423473742412417422427432437442447475251251752252753253754254757626126176226276326376426476772712717722727732737742747778281281782282783283784284787929129179229279329379429479803013018023028033038043048081311311812312813313814314818232132182232282332382432482833313318323328333338343348384341341842342843343844344848535135185235285335385435485863613618623628633638643648687371371872372873373874374878838138188238288338388438488893913918923928933938943948990401401902402903403904404909141141191241291341391441491924214219224229234239244249293431431932432933433934434939444144194244294344394444494954514519524529534539544549596461461962462963463964464969747147197247297347397447497984814819824829834839844849899491491992492993493994494991000501502002503003504004505001011511512012513013514014515011022521522022523023524024525021033531532032533033534034535031044541542042543043544044541055551552052553053554054551066561562062563063564064561077571572072573073574074571088581582082583083584084581099591592092593093594094591101060160210260310360410460111116116121126131136141146111212621622122623123624124621131363163213263313363413463114146416421426431436441446411515651652152653153654154651161666166216266316366416466117176716721726731736741746711818681682182683183684184681191969169219269319369419469120207017022027032037042047012121711712212713213714214711222272172222272322372422472123237317322327332337342347312424741742242743243744244741252575175225275325375425475126267617622627632637642647612727771772272773273774274771282878178228278328378428478129297917922927932937942947913030801802302803303804304801313181181231281331381431481132328218223228233238243248213333831832332833333834334831343484184234284334384434484135358518523528533538543548513636861862362863363864364861373787187237287337387437487138388818823828833838843848813939891892392893393894394891404090190240290340390440490141419119124129134139144149114242921922422923423924424921434393193243293343393443493144449419424429434439444449414545951952452953453954454951464696196246296346396446496147479719724729734739744749714848981982482983483984484981494999199249299349399449499150050100200250300350400450500151151101201251301351401451501152252102202252302352402452502153353103203253303353403453503154454104204254304354404454155555105205255305355405455156656106206256306356406456157757107207257307357407457158858108208258308358408458159959109209259309359409459160106011021026031036041046016111611112112613113614114611621262112212262312362412462163136311321326331336341346316414641142142643143644144641651565115215265315365415465166166611621626631636641646616717671172172673173674174671681868118218268318368418468169196911921926931936941946917020701202202703203704204701712171121221271321371421471172227212222227232237242247217323731232232733233734234731742474124224274324374424474175257512522527532537542547517626761262262763263764264761772777127227277327377427477178287812822827832837842847817929791292292793293794294791803080130230280330380430480181318113123128133138143148118232821322322823323824324821833383133233283333383433483184348413423428433438443448418535851352352853353854354851863686136236286336386436486187378713723728733738743748718838881382382883383884384881893989139239289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