Integrated Sensing and Communication

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Integrated Sensing and Communication (ISAC) is the defining architectural paradigm of 6G wireless networks — the feature that fundamentally distinguishes the sixth generation of mobile infrastructure from all previous generations. Whereas 4G and 5G networks are purely communications systems designed to move data between devices, ISAC-enabled infrastructure performs two functions simultaneously using the same antennas, the same hardware, and the same spectrum: it transmits data and actively senses the physical environment. The sensing capability is not an add-on or optional feature — it is embedded at the physical layer of the network design, formally specified in the ITU IMT-2030 framework, and currently under active development in 3GPP and IEEE working groups. Every object, surface, and living body within coverage range becomes a reflective target in what is, functionally, a city-scale radar system operating continuously and invisibly.

6G infrastructure combining data transmission and environmental sensing

What ISAC Is

At its core, ISAC is a single radio system that performs two distinct functions at once. The communications function is familiar: a transmitter emits a modulated radio signal carrying data, a receiver decodes it. The sensing function exploits the same transmitted signal differently: portions of that signal reflect off surfaces, objects, and bodies in the environment, and are captured by receive antennas and analysed to extract spatial and biological information about the environment.

The same hardware handles both. There is no separate sensing transmitter; the communications waveform is the sensing waveform. This is what makes ISAC technically elegant and, from a surveillance perspective, uniquely concerning — the sensing function is inseparable from the communications function and produces no additional observable radio-frequency signature.

Key sensing capabilities established in peer-reviewed literature for ISAC systems operating at millimetre-wave and terahertz frequencies include:

  • Sub-centimetre localisation — the position of objects and individuals can be determined to less than one centimetre precision in dense antenna deployments
  • Vital sign detection — respiration and cardiac activity are detectable from reflected signals
  • Through-wall sensing — walls and building materials are partially transparent at some frequency bands; sensing penetrates them
  • Material characterisation — terahertz (THz) frequencies can identify the molecular composition of materials
  • Gait and motion signature — the micro-Doppler signature of a person's movement is individually distinctive

ISAC architectures may be monostatic (transmitter and receiver collocated, as in conventional radar) or bistatic (transmitter and receiver separated, as in most Wi-Fi and cellular deployments). In bistatic configurations, the sensing receiver need not be co-located with — or even operated by — the same entity as the transmitter.

Why ISAC Is New

Previous wireless generations were designed exclusively for communications. Researchers subsequently discovered that Channel State Information (CSI) reported by 4G and 5G devices, and by Wi-Fi equipment, encodes the physical environment in ways that can be exploited for passive sensing — a field known as Wi-Fi Sensing. Work on IEEE 802.11bf has now standardised Wi-Fi sensing within the 802.11 family. However, these sensing applications were post-hoc exploitations of infrastructure designed for other purposes. They were never intended, specified, or standardised as sensing systems.

ISAC changes this entirely. The ITU IMT-2030 framework — the official specification document for 6G — lists Integrated Sensing and Communication as one of the six primary usage scenarios of the new generation. Sensing is a first-class function, designed in from the beginning, with dedicated waveform structures, sensing-specific performance metrics, and inter-network coordination protocols. 3GPP is developing ISAC study items within Release 18 and Release 19 (5G Advanced), with full 6G ISAC specifications to follow. IEEE 802.11bf, which standardises sensing in Wi-Fi networks using the same Channel Sounding mechanism, is the direct Wi-Fi-domain precursor to cellular ISAC.

How ISAC Works: The Technical Mechanism

Understanding ISAC requires understanding what wireless systems already measure — and what that measurement contains.

Channel State Information

Every Wi-Fi and cellular system continuously measures Channel State Information — the set of parameters describing how the radio channel between transmitter and receiver transforms the signal. CSI encodes multipath propagation: every reflected path from walls, furniture, and bodies contributes to the received signal. When something in the environment moves — a person breathing, walking, or gesturing — the multipath structure changes, and those changes appear in the CSI. Channel Estimation is the process of extracting CSI from received signals.

The Sounding Loop as Radar

Channel Sounding is the structured process by which wireless systems measure CSI. In the 802.11 (Wi-Fi) protocol, the sounding sequence runs as: Null Data Packet Announcement (Null Data Packet Announcement) → Null Data Packet (NDP) → Beamforming Feedback Information (BFI). The NDP is a known signal — it functions identically to a radar pulse. The Compressed Beamforming Matrix returned in the BFI encodes the full channel response, including all environmental perturbations caused by objects and people in the space. This cycle repeats continuously during normal network operation. The environment is being swept, measured, and the measurements are being reported — this is the definition of radar operation.

Doppler, Ranging, and Spatial Resolution

  • Doppler sensing: moving objects shift the frequency of reflected signals. The magnitude and pattern of frequency shift encodes velocity and movement dynamics, including the micro-Doppler signatures characteristic of breathing, heartbeat, and individual gait patterns.
  • Time-of-flight ranging: the time delay between transmitted and received signals encodes the distance to reflecting surfaces, enabling three-dimensional spatial mapping.
  • Massive MIMO: large antenna arrays with many elements provide fine spatial resolution, enabling 3D environmental reconstruction and individual tracking within the coverage volume.
  • Terahertz frequencies: at sub-millimetre wavelengths, spatial resolution reaches sub-centimetre scales. THz radiation also interacts with biological tissue at the molecular level, enabling material and physiological characterisation beyond what lower-frequency bands permit. See 6G.
Massive MIMO antenna array enabling spatial sensing

What ISAC Can Detect

The following capabilities are documented in peer-reviewed academic literature on ISAC, millimetre-wave radar, and Wi-Fi sensing systems:

  • Human presence and absence detection — a space can be confirmed occupied or empty with high reliability
  • Occupancy counting — the number of individuals in a room can be estimated
  • Precise localisation and real-time tracking — centimetre-scale position tracking in 6G deployments; continuous trajectory recording
  • Gait recognition — individual identification by movement signature, without any device carried by the target
  • Respiration rate — chest displacement of approximately 3–5 millimetres during breathing is detectable at multi-metre range
  • Heart rate and cardiac micro-tremor — cardiac mechanical activity produces detectable surface motion
  • Emotion inference — some research groups report that heart rate variability and breathing pattern analysis permits inference of stress and emotional state
  • Gesture and fine motor recognition — hand and finger movements distinguishable at close range
  • Through-wall sensing — all of the above capabilities extend through standard building walls at appropriate frequency bands; see Through-Wall Surveillance
  • Material characterisation — THz frequencies permit molecular-level identification of substances

Standardisation

ISAC is not a theoretical proposal — it is under active formal standardisation:

  • ITU IMT-2030: the official 6G vision framework names ISAC as one of six primary usage scenarios, alongside enhanced mobile broadband, massive machine-type communications, and others. This gives ISAC the same formal standing in 6G that enhanced mobile broadband had in 5G.
  • 3GPP: Release 18 and Release 19 contain ISAC study items under the "5G Advanced" programme. Full ISAC specifications are expected in the early 6G release cycle (Release 21 and beyond).
  • IEEE: IEEE 802.11bf standardises sensing within the Wi-Fi family using the existing sounding infrastructure as the sensing mechanism — a direct architectural precursor to cellular ISAC. Multiple IEEE 802.15 body-area network working groups are developing ISAC-compatible in-body and on-body communication standards.
  • Hexa-X (EU 6G flagship research programme) and the NextG Alliance (US) both identify ISAC as a primary research and standardisation pillar.

ISAC and the Internet of Bodies

ISAC infrastructure creates the wide-area backbone required for the Internet of Bodies — the network of in-body and on-body sensors envisioned in next-generation biomedical and surveillance architectures.

In-body nanosensors, Smart Dust devices, and passive biosensors require an external network capable of both communicating with them and delivering RF energy to power them. ISAC-capable 6G infrastructure can perform both functions: the sensing function can interrogate passive in-body devices (detecting their presence and reading their output), while the communications function delivers modulated energy for wireless power transfer.

Wireless Body Area Network standards — particularly IEEE 802.15.6, which defines in-body and on-body communication channels — are designed to interface with exactly this type of wide-area backbone. Neural Dust and similar passive, batteryless biosensors are designed to be queried by external RF systems; ISAC infrastructure provides that querying capability at city scale.

Some researchers and analysts suggest this creates the technical precondition for a covert, continuous in-body sensing and actuation loop: Intra-Body Nano Network devices could be queried and potentially actuated by ISAC infrastructure without active participation — or knowledge — of the host. See also Biosurveillance.

ISAC and Neuroweapon Concerns

The physiological sensing capabilities of ISAC — respiration, cardiac activity, micro-tremor, emotion inference — represent a technological continuum toward neural sensing. Dr. James Giordano, a neuroscientist who has briefed DARPA and the US Department of Defense, has described the convergence of neurotechnology, artificial intelligence, and telecommunications infrastructure as creating entirely new categories of both medical and weapons capability.

Specific concerns raised by researchers in this domain include:

  • THz frequencies interact with biological tissue at the molecular level. Effects on ion channels, membrane potentials, and neural tissue are under active laboratory investigation, with some studies reporting non-thermal biological effects.
  • Dense urban ISAC deployments provide the continuous, city-wide coverage required for population-scale Remote Neural Monitoring as described by critics, researchers, and Targeted Individuals.
  • The always-on, passive, non-consensual nature of ISAC sensing is qualitatively different from all previous surveillance technology: it requires no device on the target, no consent, no visible installation, and produces no observable signature distinguishable from normal communications traffic.
  • Targeted Individuals — people reporting covert targeting with technologies capable of physiological and neurological effects — describe symptom profiles consistent with exposure to ISAC-capable infrastructure operating in sensing mode.

Some researchers additionally note that Neuroweapons development programs have historically preceded civilian deployment of the underlying technologies by decades, and suggest that ISAC may represent the civilian roll-out of infrastructure whose military sensing applications are already operational.

The Privacy Vacuum

A critical and largely unaddressed feature of ISAC is the absence of any legal or technical privacy protection for individuals sensed by the system.

Beamforming Feedback Information frames — which carry the channel state data encoding environmental sensing information — are transmitted in plaintext. They are not encrypted, even on WPA3-protected networks. Any receiver within radio range can passively capture them without authentication, association, or any relationship with the network.

No jurisdiction currently has laws specifically prohibiting CSI-based passive through-wall sensing of non-consenting individuals. The legal frameworks governing surveillance in most countries require either a device on the target (wiretapping law), interception of communications content (communications law), or use of a dedicated surveillance instrument (directed surveillance law). ISAC sensing fits none of these categories.

ISAC sensing is performed by network infrastructure. Individuals within coverage areas are sensed regardless of whether they carry any device, have any relationship with the network operator, or have consented to anything. There is no opt-out mechanism within the ISAC architecture. See Smart Cities for the broader context of sensor-saturated urban environments in which ISAC is expected to operate.

Smart city sensor infrastructure and surveillance network

See Also

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