Huawei LTE PCI Analyzer
Paste a CSV or TSV of cell names and PCIs (typical Huawei LST CELL or planning-tool export). The analyzer flags duplicate PCIs, mod-3 (PSS), mod-6 (PBCH DMRS) and mod-30 (CRS) collisions, escalates same-site offenders, and suggests a clean alternative PCI.
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 3can'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
How to analyze LTE PCI allocation
- Export the PCI plan. Pull the cell PCIs and neighbour relations from your Huawei LTE export.
- Load the data. Paste or import the export into the analyzer.
- Analyze. The tool checks neighbour relations for collisions, confusion and mod-3/mod-6 conflicts.
- Resolve conflicts. Work through the flagged cells and re-plan the PCIs that clash.
Frequently asked questions
- What is the difference between PCI collision and confusion?
- A collision is when two cells that are neighbours of each other share the same PCI — the UE can't tell them apart at the boundary. Confusion is when a single cell has two neighbours that carry the same PCI, so when the UE reports that PCI the serving cell doesn't know which neighbour it means. Both break mobility, but you fix them differently, so the tool separates them.
- Why do mod-3 and mod-6 conflicts matter?
- PCI is derived from the physical-layer cell identity, and PCI mod 3 sets which of three positions the primary synchronisation signal and reference signals land on. So two strong neighbours with the same PCI mod 3 can interfere on those signals even though their PCIs differ. Mod-6 ties into the reference-signal arrangement as well. The analyzer flags these so you can plan PCIs that keep adjacent cells on different mod groups.
- What input does it need?
- A PCI allocation export from your Huawei LTE network — essentially the cells with their assigned PCIs and the neighbour relations between them. From that it checks every relation for collisions, every cell's neighbour list for confusion, and the mod-3/mod-6 spacing across adjacent cells.
- Is the export uploaded anywhere?
- No — the analysis runs in your browser, so your cell list and neighbour data stay local. Nothing is sent to a server.
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