Improving Indoor TETRA, 4G & 5G Coverage in Modern Buildings

Why Reliable Indoor Coverage Is Essential for Safety and Business Continuity

Modern buildings are becoming increasingly energy efficient thanks to advanced insulation and high-performance glazing. While these technologies reduce energy consumption, they often create an overlooked problem: poor indoor radio coverage.

As a result, many organisations experience weak TETRA, 4G, and 5G signals inside their buildings, even when outdoor coverage is excellent. This can affect day-to-day operations, employee productivity, visitor experience, and, more importantly, emergency communications.

TETRA: A Critical Communication System for Emergency Services

TETRA networks are widely used by emergency services, public safety organisations, airports, transportation providers, utilities, and critical infrastructure operators.

In an emergency, TETRA enables fast, reliable, and secure communications between field personnel, control rooms, and emergency responders. Unlike commercial mobile networks, TETRA is specifically designed for mission-critical communications where reliability is essential.

Poor indoor TETRA coverage can create communication blind spots inside buildings, potentially impacting response times, staff safety, and operational effectiveness.

This challenge is becoming increasingly common in modern buildings where energy-efficient glazing and metallic façade materials can significantly reduce signal penetration.

Why Modern Buildings Block TETRA, 4G and 5G Signals

Many modern windows contain metallic coatings that reflect heat and improve insulation performance. Unfortunately, these same coatings can also block radio signals.

The result is a building that is energy efficient but less permeable to wireless communications.

Common symptoms include:

• Weak TETRA signal indoors
• Dropped voice calls
• Poor 4G and 5G performance
• Coverage gaps in meeting rooms and interior areas
• Communication issues during emergencies
• Reduced mobile data speeds

Many organisations only discover these issues after moving into a new building or completing a renovation project.

Traditional Solutions Are Not Always Ideal

Distributed Antenna Systems (DAS) and repeaters have traditionally been used to improve indoor coverage. While effective, these solutions often require:

• Significant investment
• Additional cabling and infrastructure
• Ongoing maintenance
• Power consumption
• Lengthy deployment projects

For many buildings, owners are looking for a simpler and more cost-effective alternative.

A New Approach to Indoor Connectivity

Instead of bringing the signal further into the building through active infrastructure, it is possible to improve the ability of signals to pass through the building envelope itself.

WAVETHRU is an innovative glass treatment technology that improves the transmission of TETRA, 4G, and 5G signals through coated glazing while maintaining the thermal and aesthetic properties of the glass.

Key benefits include:

• Improved indoor TETRA coverage
• Better 4G and 5G performance
• No power consumption
• No active maintenance
• Fast deployment
• Suitable for existing and new buildings
• Cost-effective compared to many traditional alternatives

Indoor Connectivity Is Now Part of Building Design

Today, most mobile communications take place indoors. At the same time, organisations increasingly rely on wireless communications for security, operations, healthcare, logistics, and emergency response.

Reliable indoor connectivity should therefore be considered as important as heating, cooling, power, and security systems.

Building owners, facility managers, architects, and public authorities should assess indoor radio coverage early in the project lifecycle to avoid costly remediation later.

How ITNET Can Help

ITNET helps organisations evaluate and improve indoor wireless coverage through:

• TETRA coverage assessments
• 4G and 5G signal surveys
• Building attenuation analysis
• Wireless site surveys
• Coverage improvement recommendations
• Support for new-build and retrofit projects

Whether your goal is to improve communications with emergency services, enhance user experience, or ensure reliable indoor connectivity, a professional assessment is the first step toward identifying the right solution.