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Example 5.3 LTE Physical Layer Cell Identity (PCI)
ОглавлениеA cell in the LTE system can have three types of identities:
An ECI of 28 bits in length as mentioned in Example 5.1, which identifies a cell in a particular LTE network. It is defined and controlled by the higher layer. It is also used from the operation and maintenance point of view.
An E‐UTRAN Cell Global Identifier (ECGI), containing the PLMN Id, that identifies a cell globally, i.e. anywhere in the world,
A Physical Cell Identity (PCI) is used at the LTE Physical Layer level only (Figure 5.4), and it is defined as the PhysCellId in the TS 36.331 [94].
Figure 5.4 illustrates the LTE Physical Layer Cell Identities (PCI) and their groups. The PCI is similar to the UMTS scrambling code concept, for which a RAN planning is required for its proper usages. A PCI helps a UE to distinguish information received from different neighboring transmitters and select a particular cell to camp‐on at the physical layer level.
Figure 5.4 Illustration: LTE physical layer cell identities (PCI) and groups.
