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Why do we need locally unique Physical Cell IDs in LTE?

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posted Aug 25, 2013 by Luv Kumar

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1 Answer

+3 votes

PCI is a comnbination of PSS and SSS that make a range of 0 to 503 unique identities. The objective of cell search procedure within E-UTRAN is to identify one of the 504 unique Physical Cell Identities (PCIs).Hence they need to be unique in order to distinguish a cell from its neighbor cells. Secondly in handover procedure, PCI is one of the key parameters provided to the UE by the network to identify the neighbour cell for HO.therfore the neighboring cells cannot have the same PCI value. To minimize interference, the thumb rule is to ensure that neighboring cells shall not transmit the same PSS. This ensures that sync signal and reference signals do not interfere with each other.

answer Aug 25, 2013 by Sony Mohanty
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+1 vote

Let say, if cell X had PCI value 22 for 1900Mhz band and cell Y had same PCI(22) for 2500Mhz band. Both these cells are first tier neighbors?

+3 votes

Is it possible for operators to use the same PCI’s (physical cell ids) in the same place, but working in different frequency blocks?


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