Add TsFile (converted from electricsheepafrica/africa-synth-telecom-cell-tower-handover-data-nigeria)

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README.md

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 ---
-license: apache-2.0
+license: gpl
+task_categories:
+- time-series-forecasting
+language:
+- en
+tags:
+- tsfile
+- timeseries
+- time-series
+- telecom
+- nigeria
+- mobility
+- handover
+pretty_name: Africa Synthetic Telecom Cell Tower Handover (Nigeria) — TsFile
+size_categories:
+- 1M<n<10M
+configs:
+- config_name: default
+  data_files:
+  - split: train
+    path: africa_telecom_cell_tower_handover_nigeria.tsfile
 ---
+
+# Africa Synthetic Telecom Cell Tower Handover — Nigeria (TsFile)
+
+Apache TsFile version of [`electricsheepafrica/africa-synth-telecom-cell-tower-handover-data-nigeria`](https://huggingface.co/datasets/electricsheepafrica/africa-synth-telecom-cell-tower-handover-data-nigeria).
+
+## Overview
+
+A synthetic dataset of cell tower handover events for the Nigerian mobile
+network. Each record describes one handover — a subscriber's connection moving
+from one cell tower to another — including the source and destination towers and
+cities, whether it succeeded, its duration, the signal strength before and after,
+and whether a call or data session was active during the handover.
+
+The data incorporates authentic Nigerian telecommunications characteristics:
+major cities (Lagos, Abuja, Kano, Port Harcourt, Ibadan, and others), 2G/3G/4G/5G
+network types, and West Africa Time (WAT, UTC+1) event timing.
+
+- **Scale:** 1,000,000 handovers × 15 columns.
+- **Time span:** 2025-09-01 to 2025-10-01, second resolution.
+- **Cities:** 15 distinct cities (`from_city` / `to_city`).
+- **Handover types:** intracity, intercity.
+- **Network types:** 2G, 3G, 4G, 5G.
+
+## Schema (TsFile structure)
+
+This is an event/log table, not a per-entity time series. The high-cardinality
+identifier columns are kept as fields; the device dimension is the set of
+low-cardinality geo/category columns, which yields ~900 device groups
+(from_city × to_city × handover_type × network_type), each a dense per-second
+handover series.
+
+- **Time** (INT64, milliseconds) — handover timestamp. The source `timestamp`
+  is second-aligned, so the millisecond conversion is lossless. The source
+  `timestamp` column is replaced by `Time` and not retained as a duplicate field.
+- **from_city, to_city, handover_type, network_type** (TAG) — the device
+  dimension. Query one device group with, e.g.,
+  `WHERE from_city='Lagos' AND to_city='Lagos' AND handover_type='intracity' AND network_type='4G'`.
+- **event_rank** (TAG, INT64) — a generated disambiguator (0..2) that
+  distinguishes concurrent handovers sharing the same (from_city, to_city,
+  handover_type, network_type, Time) without altering Time. It is derived only
+  from the duplicate order within each device-second group.
+- **handover_id, customer_id, from_tower_id, to_tower_id** (FIELD, STRING) —
+  `handover_id` is unique per row, `customer_id` is near-unique (~946k distinct),
+  and the tower ids are high-cardinality (~135k each), so all stay as fields
+  rather than device keys.
+- **handover_duration_ms, signal_strength_from_dbm, signal_strength_to_dbm**
+  (FIELD, INT64) — handover duration and the source/destination signal strength
+  in dBm.
+- **handover_success, call_in_progress, data_session_active** (FIELD, BOOLEAN) —
+  outcome and activity flags.
+
+No columns were dropped and no rows were dropped: all 15 source columns and
+1,000,000 rows are preserved.
+
+## Usage
+
+Read the `.tsfile` file with the Apache TsFile Java or Python SDK.
+
+## Source & license
+
+- Original dataset: https://huggingface.co/datasets/electricsheepafrica/africa-synth-telecom-cell-tower-handover-data-nigeria
+- Author / publisher: electricsheepafrica (Hugging Face)
+- License: the Hugging Face dataset card metadata declares `gpl`, while the
+  source README body states "MIT License - For educational and research
+  purposes". Please defer to the original dataset for the authoritative terms.

africa_telecom_cell_tower_handover_nigeria.tsfile

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