PCI
Physical Cell Identity
This is used in E-UTRA systems to identify a cell. Its value is dependant on the combination of PSS (Primary Synchronization Signal), numbered 0 to 2 and the SSS (Secondary Synchronization Signal) numbered 0 to 167. This effectively allows for 504 combinations which are reused in the cell planning and optimization phases. The PCI value can be reused within the network and different radio carriers on the same eNB can also reuse the same PCI.