TECHNOLOGY · PoC
PoC radios for multi-site fleets: unlimited distance, 4G/LTE, GPS and dispatch, with a subscription per user and no radio sites.
Reviewed by Ellen Zhou
Quick answer
PoC (push-to-talk over cellular) moves the radio conversation onto the mobile network. The user still presses PTT and talks, but the voice travels over 4G/LTE to a platform that distributes it to the group. There is no repeater to install and no site coverage to design.
The trade-off is dependency: mobile coverage, data plans, platform subscription and latency. PoC is excellent for multi-city fleets and temporary sites, and weak where the mobile network is weak.
| Use case | Typical radios | Key features | Network | Example scale |
|---|---|---|---|---|
| Multi-city fleet | PoC mobile or handheld | GPS, dispatch, group call | 4G/LTE + platform | 20–500 radios |
| Temporary event | PoC handheld + earpiece | Temporary groups, rental pool | 4G/LTE | 20–200 radios |
| Remote site | PoC handheld + vehicle kit | No radio site, GPS | 4G/LTE | 10–60 radios |
| Mixed estate | Converged DMR/PoC terminal | Site DMR + road PoC | Repeater + 4G/LTE | 40–200 radios |
| Seasonal operation | PoC handheld | Subscription switched off after season | 4G/LTE | 10–80 radios |
| Specification | Typical PoC range | Why it matters |
|---|---|---|
| Network | 4G/LTE, Wi-Fi fallback | Coverage follows the mobile network |
| SIM | Single or dual SIM | Dual SIM improves coverage across carriers |
| Positioning | GPS/BeiDou | Dispatch sees the fleet on a map |
| Battery | 10–16 h, depending on network use | Data connection consumes more than standby |
| Protection | IP54–IP68 | Matches the environment |
| Platform | Dispatch, groups, recording, API | The platform is part of the system, not an accessory |
| Dimension | Analog | DMR | PoC |
|---|---|---|---|
| Coverage | Site + repeater | Site + repeater | Mobile network |
| Distance | Limited by site | Limited by site | City / country |
| Latency | Lowest | Low | Noticeable |
| Recurring cost | None per user | None per user | Subscription per user |
| Best fit | Simple single sites | Critical single sites | Multi-site fleets |
A PoC radio connects to the mobile network and registers with a platform. When the user presses PTT, the radio sends a request to the platform, which grants the floor and distributes the voice to the selected group. The process takes longer than a conventional radio, but works across any distance the mobile network covers.
The platform is the system: it manages users, groups, dispatch, recording and sometimes GPS history. Choosing a PoC radio means choosing a platform and a commercial relationship, not just a handset.
PoC coverage follows the mobile network. In a city or along a highway, that is excellent. In a basement, tunnel, large steel building or remote site, it can be poor or absent. The same places where a conventional repeater is strongest are often the places where PoC is weakest.
If the operation includes both, a converged DMR/PoC terminal or a gateway lets the site network and the mobile fleet share talk groups.
A conventional radio opens the transmitter as soon as PTT is pressed. A PoC call has to travel through the mobile network to the platform and back, so users hear a waiting period. The delay grows when the network is busy or the signal is weak.
For routine coordination, the delay is usually acceptable. For fast-moving work directed by voice, measure it in a pilot before committing the fleet.
Each PoC terminal needs a SIM and a data plan. Dual SIM helps where one carrier does not cover everywhere. The platform subscription is usually separate from the data plan, and both scale with headcount.
Manage the SIMs like any other asset: activation, suspension, replacement and cancellation when staff leave. An unmanaged SIM is a recurring cost with no user.
PoC radios maintain a data connection to the platform, so standby behaviour and network quality affect battery life more than in a conventional radio. A strong signal and a well-designed terminal can last a shift; a weak signal can drain the battery faster.
For long shifts, choose a model with a larger battery or a swappable pack, and plan charging the same way as a conventional fleet.
Avoid PoC when the site has no reliable mobile coverage, when the work depends on instant voice, or when the operation must continue during a network outage. Basements, tunnels, remote industrial sites and disaster response are common examples.
For those environments, a conventional DMR or analog network with a repeater is usually more reliable. A converged terminal can keep PoC for the road and conventional radio for the site.
PoC avoids a frequency licence because it uses the mobile operator’s licensed network, but the equipment still needs market approval, and the service needs a data plan and platform contract. Coverage and continuity depend on the operator.
A temporary event network with role-based talk groups, a managed radio pool and a command group.
Every functional area has coverage; each group hears only its own traffic; radios are issued programmed and charged.
Client name withheld; the figures describe the delivered configuration.
Read the project profileClick a question to see the answer
A push-to-talk radio that uses the mobile network (4G/LTE or Wi-Fi) instead of a private radio channel. It needs a SIM, a data plan and a platform subscription.
Yes. A PoC walkie talkie carries push-to-talk audio over the mobile network, so it has no repeater or frequency licence of its own but depends on cellular coverage and a platform subscription. A DMR radio uses a licensed or licence-free radio channel and works without a mobile network, which is why many fleets use a converged PoC radio that can switch between the two.
No frequency licence, because it uses the mobile operator’s licensed network. The device still needs market approval, and the service needs a data plan and platform contract.
Anywhere the mobile network covers. There is no radio-site distance limit, but basements, tunnels, remote areas and large steel buildings may have poor coverage.
It can be cheaper upfront because there is no repeater or site build, but it adds a data plan and a platform subscription per user every month. Compare five-year totals for your headcount.
Higher than conventional radio. The call has to travel through the mobile network to the platform before the floor opens. Test it in a pilot for fast-moving work.
Through a converged terminal or a gateway. The two systems can share talk groups, but the integration scope and the group plan have to be designed.
PoC degrades or stops. If the operation must continue, keep a conventional radio layer or a fallback plan. Do not rely on PoC alone for critical response.
Send the site size, number of users and talk groups. Our engineers reply within one working day with a workable configuration.
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