Land Mobile Radio: Ensuring Reliable Public-Safety Communications

The most impactful development is seamless systems integration between LMR and broadband, enabling radios to automatically switch among networks based on coverage, policy, and operational priorities. This strengthens reliability in buildings, basements, dense urban centers, and remote areas where LMR alone is insufficient. Broadband access also unlocks capabilities such as GPS, mapping, CAD data, images, and video exchange.

Hybrid devices such as Motorola SmartConnect and L3Harris BeOn® are already in the field. Over time, these devices will support intelligent roaming across LMR, commercial cellular, private 5G, Wi-Fi, and satellite networks. Key benefits include:

• Near-continuous coverage without investing heavily in new LMR sites.
• Resilience during disasters or infrastructure failures.
• Greater flexibility in future system design and funding strategies.

Hybrid integration is a foundational step toward next-generation communications.

Private 5G networks provide broadband network coverage at significantly lower cost than new P25 sites. A private 5G radio site can be built for 8–10 times less than a P25 trunked site, while supporting data-rich applications beyond LMR’s capabilities. These networks integrate easily with hybrid radios and serve use cases such as tribal lands, university campuses, industrial facilities, business districts, and municipal centers.

Low Earth Orbit (LEO) constellations such as Starlink and Lynk introduce possibilities for direct-to-device satellite connectivity. This technology could extend coverage into remote terrain, wilderness areas, and environments where tower construction is impractical. Satellite-enabled devices could eventually autonomously prioritize LMR, cellular, Wi-Fi, or satellite signals based on real-time availability.

Challenges remain — including latency, capacity management, device integration, and ensuring continuous satellite availability — but progress is rapid.

Broadband integration will transform radios from voice-centric devices to multifunction operational platforms. Capabilities include:

• High-speed GPS and mapping.
• CAD incident data pushed to the radio.
• Transmission of images, video, and situational updates.
• Enhanced integration with 911 centers and command staff.

These features improve situational awareness, reduce response times, and strengthen decision-making.

Emerging concepts propose that activating the radio’s emergency button could automatically deploy a drone to the user’s location. This would provide instant overhead imagery, enhance responder safety, and improve search-and-rescue outcomes. Although early in development, this capability represents a significant operational innovation.

Many LMR systems rely on discontinued components, unsupported firmware, and aging analog or early digital equipment. Even P25 trunked systems are reaching the 10-year mark when major upgrades and costly service agreements are required.

Notable issues:

• Inability to obtain replacement parts for older VHF/UHF systems.
• Deteriorating or inadequate shelters, grounding, antenna systems, and microwave backhaul.
• Environmental exposure often leads to catastrophic failures.

Coverage gaps, especially for portable and in-building use, remain universal. Urban growth, new construction, and unregulated or poorly installed in-building systems degrade signal quality.

Notable issues:

• Conventional systems lack engineered, guaranteed coverage.
• In-building coverage remains inadequate despite National Fire Protection Agency (NFPA) requirements.
• Agencies lack the staff needed to regulate third-party in-building system installations.

The LMR ecosystem has become increasingly expensive and consolidated, with agencies locked into proprietary interfaces and vendor-driven upgrade cycles.

Notable factors:

• P25 system costs are prohibitive for many small and medium agencies.
• Total cost of ownership is rising across maintenance, software, and cybersecurity.
• Vendor dominance (particularly Motorola) drives pricing power.
• Lack of open interfaces limits multi-vendor competition.

System reliability is threatened by absent redundancy, insufficient monitoring, and reactive, rather than preventive, maintenance.

Notable issues:

• Growing complexity of the communications network introduces new failure points.
• Maintenance, software, and cybersecurity costs are increasing.
• Few agencies maintain capital reserves or lifecycle funds for system refreshes.
• Vendor-driven obsolescence forces costly upgrades on fixed timelines.
• Workforce shortages limit engineering, technical, and cybersecurity proficiency.

Despite P25’s standardized air interface, practical interoperability remains limited due to variable compliance, legacy systems, proprietary features, and inconsistent governance.

Notable issues:

• Difficulty coordinating across regions and mutual-aid partners.
• Operational issues with multi-vendor subscriber fleets.
• Reliance on SOPs, governance, and training that often lag technological change.

Many agencies lack structured lifecycle management for infrastructure, subscriber units, and software agreements. Without proactive funding and planning, systems undergo emergency replacements rather than scheduled modernization.

Notable issues:

• No multi-year refresh plans for radios or infrastructure.
• Software update agreements vary widely and are inconsistently funded.
• Large capital costs arise after long-term service contracts expire.

Subscriber inventories contain large numbers of obsolete radios lacking encryption, GPS, broadband capability, or current firmware. Replacement costs continue to rise, and some vendors now charge subscription fees tied directly to radio functionality.

Examples:

• P25 radios: $6,000–$7,000
• Hybrid devices: $10,000 or more, plus recurring subscription charges

CJIS security requirements mandate that criminal justice information transmitted over LMR systems must be encrypted minimally to the 128-bit standard. Encryption to this standard requires additional costs.

Tower sites and shelters vary dramatically in condition. Space limitations, inadequate grounding, and failing HVAC systems shorten equipment lifespan and harm system performance. Geographic challenges, especially in rural and mountainous regions, make comprehensive coverage expensive and difficult. Environmental risks include extreme heat/cold, lightning, flooding, hurricanes, wildfires, and tornados.

Risk of cyberattacks is now a major concern as public-safety networks become targets for ransomware and other attacks. Many LMR systems contain outdated software, unsupported firmware, and weak encryption. With limited cybersecurity personnel, agencies depend heavily on vendors.

Risks include:

• AI-driven cyberattacks are becoming more sophisticated.
• Large attack surfaces from end-of-life components.
• Vulnerabilities in IP-based system elements.
• No internal monitoring tools or mitigation capabilities.
• Expanded exposure as radios roam across commercial and private networks.