Wi-SUN, OCPP and oneM2M have different jobs in a smart EV charging system: Wi-SUN connects equipment over an IPv6 mesh network, OCPP handles charging-system communication, and oneM2M supplies shared middleware services for devices and applications. A 2024 campus proof of concept combined all three to connect an EV charging station through a streetlight network; it demonstrates an architecture, not a universally standardized or production-ready end-to-end solution.
How do Wi-SUN and oneM2M work together for EV charging?
The integration is layered rather than a choice between competing technologies. In the design described by Rohan Gupta, Vaibhav Naware, Anuradha Vattem and Aftab M. Hussain in their 2024 IEEE Applied Sensing Conference paper, the charger communicates over a Wi-SUN network built on campus streetlights. OCPP is identified as the charging-system communication protocol, while oneM2M middleware sits above the network to support interaction between devices and applications.
| Layer or component | Role in the demonstrated design | What it does not establish |
|---|---|---|
| Wi-SUN | Provides wireless IPv6 mesh connectivity between the charging station and the network. | It is not itself the EV charging protocol. |
| OCPP | Provides the charging-system communication role described by the paper. | The paper does not establish that OCPP replaces the network or middleware layers. |
| oneM2M | Provides a service and middleware layer for device and application interaction. | It does not replace OCPP or mandate this particular Wi-SUN architecture. |
The oneM2M architecture describes a horizontal arrangement of applications, middleware services and networks. Its common service functions include data storage and sharing, access control and authorization, event notification, device management and location services. The paper’s authors summarize their middleware layer this way: “The oneM2M middleware layer provides a rich set of common services for data management, security, discovery, and interoperability.”
What did the campus proof of concept actually build?
The authors describe a Level 2 charging design that connected an EV charging station to the institute’s streetlight network. The charger used a Raspberry Pi 3B+ as its central processing module, with a keypad, RFID reader, display and Wi-SUN transceiver. For the campus network setup, they report using the Silicon Labs Wi-SUN SDK and an EFR32MG12 dual-band radio board. These are the authors’ prototype choices, not required components of Wi-SUN, oneM2M or OCPP.
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The paper reports an average latency of 0.7 ± 0.2 seconds for authentication, charging start and reset, excluding the time required for charging. It also reports a maximum Wi-SUN range of around 370 metres in the campus environment; the authors say the campus boundary limited the range test. Those measurements describe this implementation and setting, not a fleet-scale guarantee or a result that can be assumed for other radios, frequency plans, charger hardware, network sizes, street layouts or backhaul arrangements.
Which broader EV charging functions are covered by oneM2M?
oneM2M’s EV charging use case supplies a wider system model than the campus demonstration. It identifies roles for the electricity network, EV charging service, vehicle service and communications provider, and covers possible exchanges involving:
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- Potential power feed from a vehicle back to the network
These are use-case capabilities and interactions to consider when designing a broader system; they should not be read as features implemented or validated by the cited prototype.
What should be checked before deploying the architecture?
Wi-SUN Alliance materials describe EV charging as one possible use of existing advanced metering infrastructure (AMI) or street-lighting communications infrastructure. Its FAN material describes a certified profile and third-party testing intended to support interoperability among certified devices. That certification does not, by itself, establish end-to-end interoperability across a charger, its OCPP implementation, a oneM2M platform, utility systems and payment or billing services.
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The Wi-SUN FAN 1.1 overview describes IPv6 connectivity and a typical maximum OFDM data rate of 2.4 Mbps, while noting that mesh-network latency is part of the performance envelope. A deployment team should validate the selected profile, radio conditions, traffic volume, message deadlines and outage recovery against its actual charging workflow; the cited material does not establish that every charging-control workload will fit every Wi-SUN configuration.
Regional operating bands listed by the Wi-SUN Alliance FAQ include:
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| Region | Listed bands |
|---|---|
| North America | 902–928 MHz |
| Europe | 863–870 MHz and 870–876 MHz |
| India | 865–867 MHz |
| Japan | 920–928 MHz |
| Singapore | 866–869 MHz and 902–928 MHz |
| Brazil | 902–928 MHz |
These are bands listed in the FAQ, not a substitute for checking current local spectrum rules or equipment approvals. The FAQ also states that FAN 1.1 is compatible with FAN 1.0 networks.
- Check the full path: Confirm how the charger’s OCPP implementation, oneM2M services, network gateway or backhaul, and utility or billing systems exchange data. Do not infer end-to-end compatibility from a single component’s certification.
- Test the operating environment: Validate coverage and latency across the intended streetlight layout and network scale, not just at a single charger or campus site.
- Plan for service interruptions: Define what happens to charging workflows and queued data during a mesh or backhaul outage, and test recovery against the system’s message deadlines.
- Check electrical and service requirements: Radio connectivity does not demonstrate available electrical capacity, metering behavior, demand-response support or bidirectional power capability. Those must be addressed in the wider charging and grid design.
- Map the standards separately: oneM2M identifies TS-0001 as its functional architecture and TS-0004 as its service-layer core protocol, covering protocols, data formats, interfaces and message sequences. These specifications help define service interactions; they are not an end-to-end EV charger certification.
What the integration does—and does not—prove
The 2024 paper is evidence that Wi-SUN connectivity, OCPP charging-system communication and oneM2M middleware were combined in a campus EV charging proof of concept using streetlight infrastructure. It is not evidence of a mandated end-to-end profile, commercial-scale performance, or a complete interoperable service spanning charger, utility, vehicle and payment systems. Treat the three technologies as complementary building blocks and validate the interfaces and operating conditions for the deployment at hand.
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