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...
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LTE Radio Network Planning Introduction V1.0
LTE PCI Planning Planning Principle In LTE systems, the eNodeB distinguishes two length-31 m-sequences by scrambling an m-sequence with a binary scrambling code defining the PSC, and distinguishes cells by using three length-62 ZC sequences (root (r oot sequence index = 35, 29, 34). Only a maximum of 504 PCIs have satisfactory orthogonal performance. Therefore, t hey must be numbered to prevent prevent PCI confusion. Though all cells have different PCIs, the PCI reuse distance is insufficient for UEs to prevent interference between non-correlated non-cor related pilot signals. s ignals. Consequently, Consequently, errors occur o ccur when the UE trances pilot signals. If the errors occur during eNodeB identification, the UE may be unexpectedly handed handed over to a different cell, which may cause service dro p. Huawei suggests to use PCIs range from 0 to 440 for outdoor cells and 441 to 503 for indoor or expansion cells.
Collision If two neighboring cells are allocated with the same PCI in an intra-frequency network, a maximum of one cell can be detected by the UE, and only one cell can be synchronized during initial cell search. If the synchronized cell does not meet the handover requirements, a collision occurs, as shown in 0. in 0. Collision
Confusion If neighboring cells have the same PCI (ID A in 0) in 0) and and UEs are to t o be handed over to a neighboring cell, the eNodeB cannot decide which neighboring cell is the target cell. Consequently, Consequently, confusion occurs. o ccurs.
Therefore, PCI planning must ensure that the PCI is free from confusion and collision. In addition, PCI planning must comply with the following principles:
If a serving cell is configured with intra-frequency neighboring cells with strong interference, the neighboring cells cannot use the sa me PCI as the serving cell. NOTE
This principle does not apply to inter-frequency neighboring cells.
At the edge of a serving cell, t he pilot signals transmitted by the neighboring cell are stronger than the receive signal level of the UE. Interference occurs if a UE receives weak pilot signals from non-neighboring nearby cells at the edge of the serving cell. In t his case, these nearby cells can adopt the same PCI as the serving cell only when the interference level is lower than the associated threshold. The cells that do not interfere with the serving cell can adopt t he same PCI as the serving cell.
Pilot symbol positions of neighboring cell are staggered to the maximum extent. The position of an LTE pilot symbol is associated with the PCI code assigned by the cell. To prevent interference between pilot symbols and improve overall network performance, the pilot symbol of the serving cell cannot be located side by side with those of neighboring cells. The position of pilot symbols in t he frequency domain is determined by PCI MOD 3 in two- and four-antenna scenarios and by PCI MOD 6 in the single-antenna scenario.
PCI planning is performed easily and facilitates future network expansion. The PCIs of the same eNodeB must belong to the same PCI group, and t he PCIs of the neighboring eNodeB must belong to a different PCI group from those of the current eNodeB.
For indoor coverage scenarios, PCIs are planned as follows:
If only few RRUs cover an indoor area (typically in early site deployment stages) and macro eNodeBs are used for coverage, PCIs can be planned in the same way for indoor and outdoor scenarios. If a large number of RRUs cover an indoor area, PCIs must be planned separately for indoor and outdoor scenarios, and PCIs can be reused to the maximum extent.
To guarantee the collision and confusion do not occur, the sites location must be defined before the PCI planning. The changing of sites location will bring us a lot of troubles, maybe we need to re-planning PCI and it will also affect t he network performance.