Wi-SUN Mesh: Enabling "Seamless Dialogue" Between Hundreds of Underground EV Chargers

Hsinchu, Taiwan – April 7, 2026 – As electric vehicles become mainstream, the charging experience is quickly turning into a must-have capability for parking operators and commercial complexes. But in large, multi-level underground garages, the real challenge is not whether chargers can be installed—it is whether they can stay connected:

Chargers are spread across floors and zones. How can status and billing data be sent back reliably?
Thick concrete and dense metal structures severely weaken radio signals, making cross-floor coverage difficult.
Cabling or high-cost wireless alternatives drive up installation and maintenance costs.

When chargers are deployed but data cannot move, operations, load management, and troubleshooting all become reactive.

The Underground Connectivity Problem
Large underground parking facilities typically face significant constraints when implementing traditional networking. To address these challenges, Wi-SUN Mesh technology provides a robust alternative to wired or star-topology wireless systems, ensuring that every charger remains an active node in the smart grid, regardless of structural interference.

Key constraints in underground facilities include:

Complex multi-floor layouts: Concrete walls and metal structures significantly attenuate wireless signals.
High node density: With hundreds of chargers, traditional star networks can become congested.
High wiring cost: A wired approach requires heavy construction and is difficult to expand.

A Smart Energy Breakthrough: Wi-SUN Mesh Networking
To address these pain points, customers of VertexCom have launched the Wi-SUN Mesh Intelligent Charging Management System, powered by the VC7300/VC7351 Wi-SUN communication chips.

By leveraging the long-range, high-penetration, and self-organizing capabilities of Wi-SUN, this system transforms underground connectivity:

Ultra-Lean Architecture: A single gateway can now cover multiple underground floors and connect over 300 charging nodes.
Low-Latency Transmission: Real-time data exchange is completed within 5 seconds, ensuring load balancing commands are executed instantly.
Superior Penetration: Utilizing OFDM technology, the signal easily bypasses heavy concrete and metal obstructions.

As of February 2026, VertexCom has delivered over 100,000 units of the VC7300/VC7351 chips to leading EV charger manufacturers, fueling the digital transformation of charging infrastructure.

Proven Benefits: Performance and Cost in One System
In real deployments, the solution delivered strong results:

Simplified architecture: One gateway supports stable networking for 300+ chargers across multiple underground floors.
Low-latency delivery: Data exchange completes within 5 seconds, preventing congestion and enabling timely load balancing.
Strong penetration: Wi-SUN Mesh transmission helps maintain connectivity through thick concrete and metal structures.

System Architecture and Deployment

Charger nodes (Node): Each charger integrates a VC7351/VC7300 module. Nodes relay data over multiple hops.
Root gateway: Only one Wi-SUN gateway is required to aggregate data across multiple floors.
Data flow: Real-time data (current, voltage, status) is uploaded via Ethernet/4G/5G for Load Balancing.
Data types: Metering data, device diagnostics, and alarms.

What Wi-SUN Solves—Beyond “Wireless”
Wi-SUN addresses three core challenges: Massive connectivity (thousands of devices), complex environments (multi-hop routing), and high network resilience (self-healing).

About VertexCom

VertexCom is a brand of world-class communication chips and networking software for long-range, large-scale IoT, smart grids, and automotive applications. The offer includes a complete communication solution including Wi-SUN, HomePlug AV & GreenPHY, HPLC, G3-PLC, and hybrid dual-mode communication solutions. As a contributor to international communication specifications, VertexCom participates in the development of Wi-SUN FAN 1.1 as well as G3-PLC & RF hybrid dual-mode specification. For additional information, please visit: www.vertexcom.com

About Wi-SUN Alliance

Wi-SUN Alliance is a global non-profit member-based association made up of industry leading companies. Its mission is to drive the global proliferation of interoperable wireless solutions for use in smart cities, smart grids and other Internet of Things (IoT) applications using open global standards from organizations, such as IEEE, IETF, TIA, TTC and ETSI. With 300 members worldwide, membership of the Wi-SUN Alliance is open to all industry stakeholders and includes silicon vendors, product vendors, services providers, utilities, universities, enterprises and municipalities and local government organizations. For additional information, please visit: https://wi-sun.org

Contact:

info@vertexcom.com