EHUNAM WiFi CSI Activity Ontology
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EHUNAM WiFi CSI Activity Ontology

Release: 2026-05-27

Modified on: 2026-07-11
This version:
https://w3id.org/WiFi-CSI
Previous version:
https://doi.org/10.5281/zenodo.21089086
Revision:
1.0.1
Issued on:
2026-07-11
Authors:
https://github.com/Mikelontxu
Publisher:
https://doi.org/10.6084/m9.figshare.28541225
Source:
https://doi.org/10.6084/m9.figshare.28541225
See also:
https://doi.org/10.1038/s41597-025-06238-4
https://github.com/mikelontxu/EHUNAM-WiFi-CSI-FAIR-data
Download serialization:
JSON-LD RDF/XML N-Triples TTL
License:
https://creativecommons.org/licenses/by/4.0/
Visualization:
Visualize with WebVowl
Cite as:
EHUNAM WiFi CSI Activity Ontology, version 1.0.1, available at https://w3id.org/WiFi-CSI. DOI: https://doi.org/10.5281/zenodo.21316011
DOI:
10.5281/zenodo.21316011
Provenance of this page
Published

Abstract

This ontology provides a structured representation of WiFi Channel State Information (CSI) measurements, including details about the measurement environment, involved persons, activities performed, and technical parameters.

Introduction back to ToC

This ontology has been developed to support **EHUNAM** WiFi CSI dataset designed for human and machine sensing research. EHUNAM dataset was collected over multiple measurement campaigns across several days and environments, including indoor scenarios and an industrial setting, involving multiple participants, activities, and machines. Data was gathered using different hardware configurations (Broadcom and Atheros), extraction tools (Nexmon CSI Extraction and Atheros CSI Tool), and transmission methods, resulting in a rich and heterogeneous body of measurements. Given this complexity, organizing and describing the dataset in a consistent way is essential to make it truly accessible and reusable by the research community. This ontology addresses that need by providing a structured vocabulary to represent the key elements of each measurement. By modeling these elements formally, the ontology aims to make the EHUNAM dataset easier to explore, query, and integrate into future studies, supporting reproducibility and facilitating research in the scientific community.

EHUNAM WiFi CSI Activity Ontology: Overview back to ToC

This ontology has the following classes and properties.

Classes

Object Properties

Data Properties

Annotation Properties

Named Individuals

EHUNAM WiFi CSI Activity Ontology: Description back to ToC

Ontology for describing WiFi CSI measurements of human and machine activity captured in different environments.

Cross-reference for EHUNAM WiFi CSI Activity Ontology classes, object properties and data properties back to ToC

This section provides details for each class and property defined by EHUNAM WiFi CSI Activity Ontology.

Classes

Activityc back to ToC or Class ToC

IRI: https://w3id.org/WiFi-CSI#Activity

Type of activity performed by a person during the WiFi measurement
is in range of
Activity op
has members
Empty ni, Falling ni, Jumping ni, Sitting Still ni, Sitting down and getting up ni, Standing Still ni, Walking ni

Applicationc back to ToC or Class ToC

IRI: https://w3id.org/WiFi-CSI#Application

Type of application or use case of a WiFi measurement
is in range of
Application op
has members
Empty application ni, Human Activity Recognition ni, Machine Activity Recognition ni, Machine Recognition ni, People Counting ni, People Counting and Machine Activity Recognition ni

Bandwidthc back to ToC or Class ToC

IRI: https://w3id.org/WiFi-CSI#Bandwidth

Bandwidth of the WiFi signal, expressed in MHz (20 MHz or 80 MHz)
has super-classes
Quantity c
is in range of
Bandwidth op

CSI Extractorc back to ToC or Class ToC

IRI: https://w3id.org/WiFi-CSI#CSIExtractor

Software tool or method used to extract CSI data from the raw WiFi signals
is in range of
CSI extractor op
has members
Atheros CSI Extractor ni, Nexmon CSI Extractor ni

CSI Resultc back to ToC or Class ToC

IRI: https://w3id.org/WiFi-CSI#CSIResult

Result of a WiFi measurement containing the CSI/RSSI data and timestamps
has super-classes
Result c
is in range of
has result op

Duration (seconds)c back to ToC or Class ToC

IRI: https://w3id.org/WiFi-CSI#Duration

Duration of the WiFi measurement in seconds
has super-classes
Quantity c
is in range of
Measurement duration op

Environmentc back to ToC or Class ToC

IRI: https://w3id.org/WiFi-CSI#Environment

Type of physical environment where the WiFi measurement was taken
is in range of
Environment op
has members
Basement Room ni, Classroom ni, Industrial Laboratory ni, Laboratory ni, Meeting Room ni, Office 1 ni, Office 2 ni, Storage Room ni

Frequency bandc back to ToC or Class ToC

IRI: https://w3id.org/WiFi-CSI#FrequencyBand

Frequency band of the WiFi signal, expressed in GHz (2.4 GHz or 5 GHz)
has super-classes
Quantity c
is in range of
Frequency band op

Machine Statusc back to ToC or Class ToC

IRI: https://w3id.org/WiFi-CSI#MachineStatus

Operational status of a machine during the WiFi measurement
is in range of
Machine status op
has members
Machine On (not running) ni, Machine Running ni

Personc back to ToC or Class ToC

IRI: https://w3id.org/WiFi-CSI#Person

Identifier for a person involved during a WiFi measurement by a lowercase letter (a-u)
is in range of
involves person op

Wifi measurementc back to ToC or Class ToC

IRI: https://w3id.org/WiFi-CSI#WifiMeasurement

WiFi measurement based on CSI data in a specific environment
has super-classes
Observation c
is in domain of
Activity op, Application op, Bandwidth op, CSI extractor op, Environment op, Frequency band op, Machine status op, Measurement duration op, NIC dp, WiFi standard op, campaign dp, channel dp, has result op, involves person op, machine dp, number of files dp, number of machines dp, number of people dp, number of receivers dp, occupied subcarriers dp, receiver dp, sequential number dp, set dp, subcarriers dp, traffic dp

WiFi Standardc back to ToC or Class ToC

IRI: https://w3id.org/WiFi-CSI#WifiStandard

WiFi standard used for the measurement
is in range of
WiFi standard op
has members
IEEE 802.11ac ni, IEEE 802.11n ni

Object Properties

Activityop back to ToC or Object Property ToC

IRI: https://w3id.org/WiFi-CSI#activity

Relates a WiFi measurement to the type of activity performed by a person during the measurement
has domain
Wifi measurement c
has range
Activity c

Applicationop back to ToC or Object Property ToC

IRI: https://w3id.org/WiFi-CSI#application

Relates a WiFi measurement to the application or use case it is associated with
has domain
Wifi measurement c
has range
Application c

Bandwidthop back to ToC or Object Property ToC

IRI: https://w3id.org/WiFi-CSI#bandwidth

Relates a WiFi measurement to the bandwidth of the WiFi signal used for the measurement
has domain
Wifi measurement c
has range
Bandwidth c

CSI extractorop back to ToC or Object Property ToC

IRI: https://w3id.org/WiFi-CSI#csiExtractor

Relates a WiFi measurement to the CSI extractor tool or method used to obtain the CSI data
has domain
Wifi measurement c
has range
CSI Extractor c

Environmentop back to ToC or Object Property ToC

IRI: https://w3id.org/WiFi-CSI#environment

Relates a WiFi measurement to the physical environment where it was taken
has domain
Wifi measurement c
has range
Environment c

Frequency bandop back to ToC or Object Property ToC

IRI: https://w3id.org/WiFi-CSI#frequencyBand

Relates a WiFi measurement to the frequency band of the WiFi signal used for the measurement
has domain
Wifi measurement c
has range
Frequency band c

has resultop back to ToC or Object Property ToC

IRI: https://w3id.org/WiFi-CSI#hasResult

Relates a WiFi measurement to its result containing the CSI data and timestamps
has super-properties
has Result op
has domain
Wifi measurement c
has range
CSI Result c

involves personop back to ToC or Object Property ToC

IRI: https://w3id.org/WiFi-CSI#involvesPerson

Relates a WiFi measurement to the person (the letter) involved in the measurement
has domain
Wifi measurement c
has range
Person c

Machine statusop back to ToC or Object Property ToC

IRI: https://w3id.org/WiFi-CSI#machineStatus

Relates a WiFi measurement to the operational status of a machine during the measurement
has domain
Wifi measurement c
has range
Machine Status c

Measurement durationop back to ToC or Object Property ToC

IRI: https://w3id.org/WiFi-CSI#measurementDuration

Relates a WiFi measurement to its duration in seconds
has domain
Wifi measurement c
has range
Duration (seconds) c

WiFi standardop back to ToC or Object Property ToC

IRI: https://w3id.org/WiFi-CSI#wifiStandard

Relates a WiFi measurement to the WiFi standard used for the measurement
has domain
Wifi measurement c
has range
WiFi Standard c

Data Properties

campaigndp back to ToC or Data Property ToC

IRI: https://w3id.org/WiFi-CSI#campaign

Measurement campaign identifier (e.g. MC1).
has domain
Wifi measurement c
has range
string

channeldp back to ToC or Data Property ToC

IRI: https://w3id.org/WiFi-CSI#channel

WiFi channel used during the measurement (11, 13 or 40).
has domain
Wifi measurement c
has range
integer

machinedp back to ToC or Data Property ToC

IRI: https://w3id.org/WiFi-CSI#machine

Identifier of the machine present during the measurement (1–9).
has domain
Wifi measurement c
has range
integer

NICdp back to ToC or Data Property ToC

IRI: https://w3id.org/WiFi-CSI#nic

Model of the network interface card of the CSI receiver.
has domain
Wifi measurement c
has range
string

number of filesdp back to ToC or Data Property ToC

IRI: https://w3id.org/WiFi-CSI#nFiles

Total number of .mat files in the set this measurement belongs to.
has domain
Wifi measurement c
has range
integer

number of machinesdp back to ToC or Data Property ToC

IRI: https://w3id.org/WiFi-CSI#nMachine

Total number of machines involved in the measurement.
has domain
Wifi measurement c
has range
integer

number of peopledp back to ToC or Data Property ToC

IRI: https://w3id.org/WiFi-CSI#nPeople

Total number of people present during the measurement.
has domain
Wifi measurement c
has range
integer

number of receiversdp back to ToC or Data Property ToC

IRI: https://w3id.org/WiFi-CSI#nReceivers

Number of receiver devices used in the measurement (1–4).
has domain
Wifi measurement c
has range
integer

occupied subcarriersdp back to ToC or Data Property ToC

IRI: https://w3id.org/WiFi-CSI#occupiedSubcarriers

Number of useful subcarriers (data + pilots) after excluding null subcarriers per IEEE 802.11n/ac.
has domain
Wifi measurement c
has range
integer

receiverdp back to ToC or Data Property ToC

IRI: https://w3id.org/WiFi-CSI#receiver

Identifier of the receiver device that captured the measurement (1–4).
has domain
Wifi measurement c
has range
integer

sequential numberdp back to ToC or Data Property ToC

IRI: https://w3id.org/WiFi-CSI#sequentialNumber

Sequential number to distinguish measurements with otherwise identical metadata.
has domain
Wifi measurement c
has range
integer

setdp back to ToC or Data Property ToC

IRI: https://w3id.org/WiFi-CSI#set

Set identifier within the campaign (e.g. MC1_01A). Each set corresponds to a specific location.
has domain
Wifi measurement c
has range
string

subcarriersdp back to ToC or Data Property ToC

IRI: https://w3id.org/WiFi-CSI#subcarriers

Total number of OFDM subcarriers captured (64 for 20 MHz, 256 for 80 MHz in MC1).
has domain
Wifi measurement c
has range
integer

trafficdp back to ToC or Data Property ToC

IRI: https://w3id.org/WiFi-CSI#traffic

Network traffic type present during the measurement (e.g. FTP).
has domain
Wifi measurement c
has range
string

Annotation Properties

abstractap back to ToC or Annotation Property ToC

IRI: http://purl.org/dc/terms/abstract

bibliographic Citationap back to ToC or Annotation Property ToC

IRI: http://purl.org/dc/terms/bibliographicCitation

createdap back to ToC or Annotation Property ToC

IRI: http://purl.org/dc/terms/created

creatorap back to ToC or Annotation Property ToC

IRI: http://purl.org/dc/terms/creator

descriptionap back to ToC or Annotation Property ToC

IRI: http://purl.org/dc/terms/description

doiap back to ToC or Annotation Property ToC

IRI: http://purl.org/ontology/bibo/doi

identifierap back to ToC or Annotation Property ToC

IRI: http://purl.org/dc/terms/identifier

is Referenced Byap back to ToC or Annotation Property ToC

IRI: http://purl.org/dc/terms/isReferencedBy

issuedap back to ToC or Annotation Property ToC

IRI: http://purl.org/dc/terms/issued

languageap back to ToC or Annotation Property ToC

IRI: http://purl.org/dc/terms/language

licenseap back to ToC or Annotation Property ToC

IRI: http://purl.org/dc/terms/license

modifiedap back to ToC or Annotation Property ToC

IRI: http://purl.org/dc/terms/modified

notationap back to ToC or Annotation Property ToC

IRI: http://www.w3.org/2004/02/skos/core#notation

preferred Namespace Prefixap back to ToC or Annotation Property ToC

IRI: http://purl.org/vocab/vann/preferredNamespacePrefix

preferred Namespace Uriap back to ToC or Annotation Property ToC

IRI: http://purl.org/vocab/vann/preferredNamespaceUri

publisherap back to ToC or Annotation Property ToC

IRI: http://purl.org/dc/terms/publisher

sourceap back to ToC or Annotation Property ToC

IRI: http://purl.org/dc/terms/source

statusap back to ToC or Annotation Property ToC

IRI: http://purl.org/ontology/bibo/status

titleap back to ToC or Annotation Property ToC

IRI: http://purl.org/dc/terms/title

was Derived Fromap back to ToC or Annotation Property ToC

IRI: http://www.w3.org/ns/prov#wasDerivedFrom

Named Individuals

Atheros CSI Extractorni back to ToC or Named Individual ToC

IRI: https://w3id.org/WiFi-CSI#AtherosCSIExtractor

CSI extractor based on the Nexmon framework for Atheros WiFi chipsets
belongs to
CSI Extractor c
has facts
notation ap "ACT"

Basement Roomni back to ToC or Named Individual ToC

IRI: https://w3id.org/WiFi-CSI#BasementRoom

WiFi measurement taken in a basement environment
belongs to
Environment c

Classroomni back to ToC or Named Individual ToC

IRI: https://w3id.org/WiFi-CSI#Classroom

WiFi measurement taken in a classroom environment with desks and chairs
belongs to
Environment c

Emptyni back to ToC or Named Individual ToC

IRI: https://w3id.org/WiFi-CSI#Empty

No person activity is present during the WiFi measurement
belongs to
Activity c
has facts
notation ap "E"

Empty applicationni back to ToC or Named Individual ToC

IRI: https://w3id.org/WiFi-CSI#EmptyApplication

No specific application or use case is associated with the WiFi measurement
belongs to
Application c
has facts
notation ap "E"

Fallingni back to ToC or Named Individual ToC

IRI: https://w3id.org/WiFi-CSI#Falling

Person is falling during the WiFi measurement
belongs to
Activity c
has facts
notation ap "F"

Human Activity Recognitionni back to ToC or Named Individual ToC

IRI: https://w3id.org/WiFi-CSI#HAR

Application for human activity recognition using WiFi measurements
belongs to
Application c
has facts
notation ap "HAR"

IEEE 802.11acni back to ToC or Named Individual ToC

IRI: https://w3id.org/WiFi-CSI#IEEE_802_11ac

WiFi measurement taken using the IEEE 802.11ac standard
belongs to
WiFi Standard c

IEEE 802.11nni back to ToC or Named Individual ToC

IRI: https://w3id.org/WiFi-CSI#IEEE_802_11n

WiFi measurement taken using the IEEE 802.11n standard
belongs to
WiFi Standard c

Industrial Laboratoryni back to ToC or Named Individual ToC

IRI: https://w3id.org/WiFi-CSI#IndustrialLaboratory

WiFi measurement taken in an industrial laboratory environment with machines and equipment
belongs to
Environment c

Jumpingni back to ToC or Named Individual ToC

IRI: https://w3id.org/WiFi-CSI#Jumping

Person is jumping during the WiFi measurement
belongs to
Activity c
has facts
notation ap "J"

Laboratoryni back to ToC or Named Individual ToC

IRI: https://w3id.org/WiFi-CSI#Laboratory

WiFi measurement taken in a laboratory environment
belongs to
Environment c

Machine Activity Recognitionni back to ToC or Named Individual ToC

IRI: https://w3id.org/WiFi-CSI#MAR

Application for machine activity recognition using WiFi measurements
belongs to
Application c
has facts
notation ap "MAR"

Machine On (not running)ni back to ToC or Named Individual ToC

IRI: https://w3id.org/WiFi-CSI#MachineOn

The machine is turned on (but not running) and operational during the WiFi measurement
belongs to
Machine Status c
has facts
notation ap "O"

Machine Recognitionni back to ToC or Named Individual ToC

IRI: https://w3id.org/WiFi-CSI#MR

Application for machine recognition using WiFi measurements
belongs to
Application c
has facts
notation ap "MR"

Machine Runningni back to ToC or Named Individual ToC

IRI: https://w3id.org/WiFi-CSI#MachineRunning

The machine is running during the WiFi measurement
belongs to
Machine Status c
has facts
notation ap "R"

Meeting Roomni back to ToC or Named Individual ToC

IRI: https://w3id.org/WiFi-CSI#MeetingRoom

WiFi measurement taken in a meeting room environment with a table and chairs
belongs to
Environment c

Nexmon CSI Extractorni back to ToC or Named Individual ToC

IRI: https://w3id.org/WiFi-CSI#NexmonCSIExtractor

CSI extractor based on the Nexmon framework for WiFi firmware modification
belongs to
CSI Extractor c
has facts
notation ap "NCE"

Office 1ni back to ToC or Named Individual ToC

IRI: https://w3id.org/WiFi-CSI#Office1

WiFi measurement taken in an office environment with furniture and objects
belongs to
Environment c

Office 2ni back to ToC or Named Individual ToC

IRI: https://w3id.org/WiFi-CSI#Office2

WiFi measurement taken in an office environment with more people and machines
belongs to
Environment c

People Countingni back to ToC or Named Individual ToC

IRI: https://w3id.org/WiFi-CSI#PC

Application for people counting using WiFi measurements
belongs to
Application c
has facts
notation ap "PC"

People Counting and Machine Activity Recognitionni back to ToC or Named Individual ToC

IRI: https://w3id.org/WiFi-CSI#PCMAR

Application for people counting and machine activity recognition using WiFi measurements
belongs to
Application c
has facts
notation ap "PCMAR"

Sitting down and getting upni back to ToC or Named Individual ToC

IRI: https://w3id.org/WiFi-CSI#SittingDownAndGettingUp

Person alternates between sitting down and getting up during the WiFi measurement
belongs to
Activity c
has facts
notation ap "G"

Sitting Stillni back to ToC or Named Individual ToC

IRI: https://w3id.org/WiFi-CSI#SittingStill

Person is sitting still during the WiFi measurement
belongs to
Activity c
has facts
notation ap "T"

Standing Stillni back to ToC or Named Individual ToC

IRI: https://w3id.org/WiFi-CSI#StandingStill

Person is standing still during the WiFi measurement
belongs to
Activity c
has facts
notation ap "S"

Storage Roomni back to ToC or Named Individual ToC

IRI: https://w3id.org/WiFi-CSI#StorageRoom

WiFi measurement taken in a storage room environment
belongs to
Environment c

Walkingni back to ToC or Named Individual ToC

IRI: https://w3id.org/WiFi-CSI#Walking

Person is walking during the WiFi measurement
belongs to
Activity c
has facts
notation ap "W"

zenodo.21316011ni back to ToC or Named Individual ToC

IRI: https://doi.org/10.5281/zenodo.21316011

is same as
Wi Fi C S I ni
has facts
same As ep Wi Fi C S I ni

Legend back to ToC

c: Classes
op: Object Properties
dp: Data Properties
ni: Named Individuals
ep: External Properties

Referencias volver a índice

- EHUNAM Dataset Repository. GitHub. [https://github.com/GuillermoDiazSM/EHUNAM-dataset](https://github.com/GuillermoDiazSM/EHUNAM-dataset) - EHUNAM Dataset. [https://doi.org/10.6084/m9.figshare.28541225](https://doi.org/10.6084/m9.figshare.28541225) - EHUNAM Scientific Paper. [https://doi.org/10.1038/s41597-025-06238-4](https://doi.org/10.1038/s41597-025-06238-4)
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Acknowledgments back to ToC

The authors would like to thank Silvio Peroni for developing LODE, a Live OWL Documentation Environment, which is used for representing the Cross Referencing Section of this document and Daniel Garijo for developing Widoco, the program used to create the template used in this documentation.