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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.
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