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 differ…Full description
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Enable macro in Excel Options and enjoy tool. System BW [MHz] select It is not recommended to have following PCIs in neighbour cells for PCI in 'colu PCI
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 (five hundred and four), 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. Description Number of RBs Number of REGs Partial Overlapping of REGs PCI separation for partial overlapping Full overlapping of REGs PCI separation for Full overlapping
1.4MHz 6 12 No NA YES 3
3MHz 15 30 Yes 7/8 YES 15
5MHz 25 50 Yes 12/13 YES 25
bandwidth nd to have overlapping PCFICH ndwidth will