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Wi-Fi offload moves some or all mobile-device data traffic from cellular access onto Wi-Fi. It can help address cellular congestion and improve indoor connectivity, but it is not a single feature: operators must choose how devices find and authenticate to hotspots, how traffic is protected and steered, and how Wi-Fi connects to the mobile core.
What Wi-Fi offload means
Wi-Fi offload is the movement of data traffic or IP flows from a 4G or 5G cellular connection onto a Wi-Fi network. The Telecommunication Engineering Centre (TEC), part of India’s Department of Telecommunications, describes it as moving data and IP flow from cellular networks to WLAN. Its draft lists congestion relief, spectrum efficiency, user experience, and in-building service among the intended benefits; it does not provide measured results or guarantee that a particular deployment will achieve them. TEC, Draft Wi-Fi Offloading Generic Requirements, Version 02.
The important distinction is that “offload” describes a traffic outcome, not one universal network design. A phone might move all its traffic to Wi-Fi, send only selected app flows over Wi-Fi, or use Wi-Fi and cellular at the same time. The right choice depends on operator policy, client support, security architecture, service requirements, and mobile-core integration.
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How does Wi-Fi offloading work?
A deployment has to solve several connected problems: the device must identify a suitable network, obtain credentials or another authentication method, establish a protected connection, and follow policy about which traffic uses Wi-Fi. The Wi-Fi network must then interoperate with the operator’s authentication and core-network systems as required by the chosen access model.
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- Discovery: The device finds an eligible hotspot. Passpoint can help compatible clients discover provider networks and obtain information about them before connecting.
- Authentication: The client and network verify access using a configured method, such as an enterprise EAP method or SIM-based credentials, where supported.
- Security and core interworking: Depending on whether Wi-Fi is treated as trusted or untrusted, traffic may follow a direct authentication path or a protected tunnel to a mobile-core gateway.
- Traffic steering: Operator policy determines whether all traffic, selected flows, or concurrent Wi-Fi and cellular traffic use the Wi-Fi path.
- Service control: QoS, prioritization, bandwidth management, charging, roaming, and validation affect how the service behaves beyond the initial connection.
These are design functions, not a guarantee that every operator deployment implements every mode or feature.
Trusted and untrusted Wi-Fi use different network paths
“Trusted” and “untrusted” refer to access and interworking models, not a simple judgment that one public hotspot is safe and another is unsafe. The Indian TEC draft describes different authentication and gateway paths for the two models. Exact architectures depend on the operator deployment and applicable 3GPP versions.
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| Access model | Path described in the TEC draft | What to account for |
|---|---|---|
| Trusted Wi-Fi | Direct authentication to AAA/HSS using 802.1X/EAP. | Authentication-system integration, supported EAP methods, and operator policy. |
| Untrusted Wi-Fi | An IPsec/IKEv2 tunnel between the user equipment and an ePDG/N3IWF. | Client and gateway support, tunnel establishment, and mobile-core integration. |
The draft also compares LTE trusted access through a TWAG with an untrusted ePDG path. These descriptions are from an Indian draft requirements document, not a universal final specification. Read the TEC draft.
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What Passpoint does—and what it does not do
Passpoint, also called Hotspot 2.0, helps compatible devices discover and authenticate to eligible Wi-Fi hotspots. Android’s documentation describes its use of IEEE 802.11u functions, including Generic Advertisement Service (GAS) and Access Network Query Protocol (ANQP), to exchange information that helps a device select a network. Microsoft describes Passpoint as using 802.11u to communicate with a provider before connection, with WPA2-Enterprise or WPA3-Enterprise and EAP for authentication and encryption. Android Open Source Project: Passpoint; Microsoft Learn: Passpoint.
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Passpoint helps with discovery and connection; it does not by itself provide operator credentials, guarantee that every device can connect, decide which app traffic to offload, or replace mobile-core integration. A working service depends on compatible client hardware and software, supported authentication methods, correctly provisioned profiles or credentials, and matching network configuration.
Check device, firmware, and profile support
- Android: AOSP states that Passpoint support is required on Android 11 or later devices with Wi-Fi, but manufacturers still need to provide firmware support for 802.11u. Android versions and implementations have differed in their supported EAP methods.
- Windows: Provisioning paths and credential types vary. Microsoft’s documentation, last updated January 31, 2025, lists SIM-based EAP-SIM, EAP-AKA, and EAP-AKA′ support under some provisioning paths and notes constraints for Online Sign-Up in Windows 11. Confirm the current requirements for the specific device and provisioning route.
- Older Android versions: AOSP documents a historical issue in Android 8.x and 9 in which certain Passpoint Release 1 SIM-based profiles would not auto-connect. The advisory says it does not apply to Android 10 or later, so it is a version-specific compatibility example rather than a general current limitation.
Choose a traffic-steering strategy
The TEC draft identifies three traffic treatments for trusted networks. They are distinct choices, and the draft’s listing does not mean that every operator offers all three.
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| Strategy | Traffic treatment | Key consideration |
|---|---|---|
| Full offload | All device traffic uses Wi-Fi. | Requires the operator to account for the whole device’s traffic and service policy on the Wi-Fi path. |
| Selective offload | Selected app flows use Wi-Fi while other traffic remains on cellular. | Requires policy to identify and steer the intended flows. |
| Hybrid connectivity | Wi-Fi and cellular carry traffic simultaneously; the draft names MPTCP and ATSSS as examples. | Requires compatible devices, network support, and policy for concurrent paths. |
The draft calls for policy control, QoS-class mapping, real-time traffic prioritization, dynamic bandwidth allocation, and charging mechanisms. These are design requirements in that draft, not proof that a particular network implements them or that offload will improve every application’s performance. TEC draft requirements.
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There is no single security answer for “Wi-Fi offload,” because security depends on the access model, authentication method, client configuration, and network path. In the TEC draft’s untrusted model, IPsec/IKEv2 protects the connection between the device and an ePDG/N3IWF. In the trusted model, the draft describes 802.1X/EAP authentication toward AAA/HSS. Microsoft’s Passpoint overview describes WPA2-Enterprise or WPA3-Enterprise with EAP for authentication and encryption.
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Those mechanisms describe parts of a design; they do not establish that every Wi-Fi hotspot is secure or that every deployment uses the same protections. An operator should validate the complete client-to-network path, credential provisioning, authentication configuration, gateway interworking, and applicable security policy. Users should not infer that a network is protected merely because it is branded as carrier Wi-Fi or supports Passpoint.
Plan the deployment beyond the access point
A hotspot radio is only one component. The TEC draft includes access points, AAA servers, ePDG/N3IWF gateways, and mobile cores in its interoperability scope, and it discusses roaming and validation. A deployment discussion should therefore cover the end-to-end service rather than just Wi-Fi coverage.
- Access points and sites: Identify indoor or outdoor locations, locally permitted frequency bands, throughput and MIMO targets, and any required outdoor rating.
- Client ecosystem: Check Passpoint, 802.11u, firmware, supported EAP methods, SIM or other credential support, and profile provisioning across the devices the service intends to support.
- Authentication and core: Define AAA integration and, for an untrusted path, the relevant ePDG/N3IWF and mobile-core connectivity.
- Traffic policy and service: Decide which traffic uses Wi-Fi, how QoS classes map, how priority and bandwidth are managed, and how charging is handled.
- Roaming and validation: Specify partner-network behavior and test interoperability across access points, authentication systems, gateways, client types, and core systems.
- Procurement and compliance: Match equipment claims to technical specifications and intended scale, then verify local frequency, equipment, and regulatory requirements.
A retail access point can be useful for a basic hotspot or lab, but the device alone does not supply Passpoint roaming, subscriber AAA, traffic policy, gateway tunneling, mobile-core integration, or regulatory compliance.
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The main requirements source here is the Telecommunication Engineering Centre’s Draft Wi-Fi Offloading Generic Requirements, Version 02, published by India’s Department of Telecommunications. It is explicitly a draft and includes Indian regulatory and frequency context. Its “shall” language should not be treated as a universal final standard or as a requirement in another country. Operators and equipment buyers should check the document’s current status and the rules applicable in their jurisdiction before relying on it. TEC draft PDF.
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