Latest / The 5G Podcast with Fexingo: Wireless Networks, Carriers, and Mobile Infrastructure / How 5G Is Rewriting the Rules for Emergency Response Networks
Transcript
- Lucas: The Los Angeles Fire Department responds to over half a million calls every year. Structure fires, medical emergencies, brush fires, traffic collisions — and when a crew rolls out, they're still carrying two-way radios on a dedicated public-safety band that has absolutely nothing to do with your cell phone. Luna: Right, the same VHF and UHF radios they've used for decades. Separate infrastructure, separate towers, separate spectrum. Lucas: Exactly. And that separation exists for a reason: when the power grid fails or a commercial tower gets overloaded during a disaster, firefighters still need to communicate. But it's also expensive and limits what they can send — voice only, essentially, or low-bit-rate data. No high-definition video from the scene, no biometric telemetry from a firefighter's gear. Luna: So 5G is supposed to change that. But how do you trust a commercial network with a life or death call? Lucas: That's the core question, and it comes down to a feature called network slicing. In 3GPP Release 15 and refined in Release 16, 5G introduced the ability to carve out a virtual, end to end network within the physical infrastructure. A slice has its own guaranteed bandwidth, its own latency budget, its own security policies — it behaves like a private network even though it shares the same towers and spectrum. Luna: And this is already deployed, not just a spec on paper? Lucas: It is. Verizon and the LA Fire Department ran a pilot last year called the 5G First Responder Lab. They gave fire trucks a 5G router that connects to a dedicated slice configured for ultra-reliable low-latency communications — URLLC in the standards. The slice guarantees less than 50 milliseconds of round-trip latency and 99.999 percent availability, even if the rest of the network is congested. Luna: What were they actually doing with that slice? Lucas: Two applications that stand out. First, they mounted a 4K 360-degree camera on the front of the truck. As the engine approaches a fire, the incident commander at the station can pan and zoom remotely — seeing the scene before anyone gets off the truck. That video stream goes over the dedicated slice, not competing with someone watching TikTok on the same tower. Luna: So the commander can decide in advance whether to call for a second alarm or a hazmat unit. Lucas: Exactly. And the second use case is wearable biometrics. Firefighters wear sensors that track heart rate, skin temperature, and ambient air temperature. That data is sent in real time to a monitoring station. If a firefighter's core temp spikes, the system alerts the commander who can pull them out before heatstroke sets in. That data is also latency-sensitive and can't be lost. Luna: And the alternative would be a dedicated private 5G network, but that's expensive to build and maintain across a whole city. Lucas: Right. A city-wide private 5G network for first responders would cost tens of millions to deploy and millions more annually. Using a slice on an existing commercial network drops that cost dramatically — and it scales by design. The same slice can be extended to police, EMS, and public works with software updates, not new tower construction. Luna: But there has to be a catch. Carriers have had trouble guaranteeing reliability for consumers; why would a fire chief trust them for life safety? Lucas: It's a fair concern, and it's why the early deployments are for supplemental data, not for primary voice dispatch. No one is replacing the two-way radio yet. The slice carries the video and telemetry — information that improves situational awareness but isn't the final fail-safe. And the network is designed with redundancy: the slice can be configured to stay alive even if the carrier's core network loses connectivity to the internet, because the slice's control functions can be local. Luna: That makes sense. So the radio stays as the safety net, but the slice adds a rich data layer on top. Lucas: Precisely. And the standards are moving toward hardening that even further. 3GPP Release 18, which was frozen earlier this year, includes enhancements for what's called 5G Advanced. It adds support for time-sensitive networking and even tighter latency bounds, plus improved redundancy for mission-critical slices. The goal is to eventually make the slice reliable enough for primary voice. Luna: Is anyone else doing this beyond LA and Verizon? Lucas: A few. AT&T has a partnership with the FirstNet Authority — that's the public-safety network built on dedicated spectrum, not a slice — but they're also trialing slicing for data. In Europe, the German government's '5G for Public Safety' project is testing slices across multiple carriers. And in Japan, NTT Docomo is working with the Tokyo Fire Department on a slice for drone feeds at large-scale disasters. Luna: It feels like we're at the early-adopter stage, but the trajectory is clear. And it's interesting that it's commercial carriers pushing this, not just the usual public-safety vendors. Lucas: That's partly because the carriers see a new revenue stream. Public safety agencies have budgets and are willing to pay a premium for reliability. A mission-critical slice can command five to ten times the price of a regular consumer data plan. For the carriers, it's a high-margin business that also strengthens their network engineering. Luna: Speaking of supporting things that matter — I know this show is ad-free, and a couple of dollars a month is genuinely what keeps these going. If you've gotten something useful out of today's tech conversation, buy me a coffee dot com slash fexingo — that's buy me a coffee dot com slash fexingo. It really does make a difference. Lucas: Absolutely. And we keep it ad-free so we can go deep into these technical details without having to pander to a sponsor. So if that's valuable, that link is the way to chip in. Luna: Back to the standards: Release 18 also includes something called 'sidelink' enhancements for public safety. Can you explain that? Lucas: Sure. Sidelink is a device to device communication mode — two phones can talk directly without going through the tower. It's been in LTE for years as part of the 'ProSe' standard, but 5G sidelink in Release 18 is faster and supports group communications. That's critical for first responders because if the tower is destroyed, they can still create a local mesh network among themselves. Luna: So the slice handles the wide-area data; sidelink handles the device to device fallback. Lucas: Exactly. And that combination — slice plus sidelink — is what could eventually let first responders retire that second radio. The commercial handset in their pocket, with a SIM card that authenticates to a priority slice and supports sidelink for ad-hoc mesh, becomes the single device. Luna: But that also raises a question about spectrum. Public-safety agencies have their own licensed spectrum — 700 MHz band, for example. If they move to commercial slices, they're using the carrier's spectrum, not theirs. Lucas: Right, and that's a policy issue as much as a technical one. In the US, the FirstNet network uses dedicated 700 MHz spectrum that was auctioned specifically for public safety. If a fire department starts relying on a Verizon slice, they're on Verizon's spectrum. That gives Verizon significant leverage — and creates a single point of failure if the carrier's network goes down for reasons unrelated to the emergency. Luna: So there's a tension between cost efficiency and strategic independence. Lucas: There is. And the current consensus among public-safety technology officers is that slices are great for supplementary services, but critical voice and dispatch should stay on dedicated spectrum — at least for now. The slices are a complement, not a replacement. Luna: Makes sense. One more thing: the latency guarantee of 50 milliseconds — is that verifiable? Can the fire department audit that the slice is actually delivering what it promises? Lucas: Yes, and that's built into the standard. 5G network slicing includes performance monitoring and assurance mechanisms. The carrier exposes key performance indicators — latency, jitter, packet loss — via network data analytics functions. The fire department's IT team can run continuous probes and if the slice falls below the agreed threshold, the carrier has to remediate or face penalties. It's a service-level agreement, not a handshake. Luna: So the commercial model actually forces accountability in a way that the old dedicated system didn't. The fire department had to maintain its own gear; now the carrier is on the hook. Lucas: Exactly. And the slice can be configured in real time. If a major earthquake hits, the fire department can request a higher-priority slice with more bandwidth and lower latency — and the carrier can instantiate it within minutes. You can't do that with a dedicated radio system; you're stuck with whatever hardware you deployed. Luna: That's a powerful capability. So the biggest hurdle isn't technology anymore — it's trust, policy, and the transition from old to new. Lucas: I think that's right. The first responders I've spoken to are excited about the data capabilities, but they also say 'show me it works for five years without a major failure.' And that's fair. This is literally life or death infrastructure. The technology is ready; the proof of reliability is still being built. Luna: And we'll see that proof in the next few years as more pilots go live. Thanks Lucas. Lucas: Thanks Luna. For our listeners, if you're curious about the LA pilot, Verizon published a technical white paper in February that goes into the slice architecture in detail — we'll link it in the show notes. See you next time.