PCI stands for Physical Cell Identity, to make is as easy as possible, it is the identifier of LTE eutrancell, same like PSC in 3G or BCCH in 2G, it consists of 2 parts PSS (Primary Synchronization Signal) and SSS (Secondary Synchronization Signal), both used to give PCI, PCI=3xSSS+ PSS, they are used mainly to achieve radio frame, subframe, slot and symbol synchronization in the time domain and to Identify the center of the channel bandwidth in the frequency domain.
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