About PCI planning in LTE

LTE Physical Cell IDs range from 0 to 503 and are derived from two group identifiers: N_ID^(1) (0–167) and N_ID^(2) (0–2). Because N_ID^(2) = PCI mod 3 directly selects the PSS sequence, two neighbouring cells that share the same PCI mod 3 can't be told apart during initial acquisition — the classic mod-3 collision. Mod-6 collisions create the same kind of ambiguity for PBCH DMRS and mod-30 for the cell-specific reference signal (CRS) frequency shift.

Same-site (intra-eNB) collisions are especially bad because the offending cells are geographically co-located and have overlapping main lobes. This tool escalates those to a higher severity so you can fix them first.

Related tools

• PCI Planning Tool (5G NR)
• Huawei MML Script Parser
• Huawei Counter Parser