Wireless backhaul links run either in licence-exempt bands that anyone may use within the rules, or in licensed bands where Innovation, Science and Economic Development Canada (ISED) assigns you a frequency at a specific location. Unlicensed links are faster and cheaper to set up but share the air with others. Licensed links cost more and take longer, but give you protection from interference. The right choice depends on how much the link matters and what the radio environment looks like.
What "licensed" actually means
In Canada, radio spectrum is managed by ISED. For licensed fixed links, a frequency is coordinated for your path so that other licensed users in the area do not interfere with you, and you do not interfere with them. You pay licence fees and must operate within the technical terms of the licence. In exchange, if a later user causes interference, there is a formal process to resolve it.
Licence-exempt bands, often called unlicensed, can be used by anyone with certified equipment operating within the power and technical limits set by the regulations. Nobody is guaranteed a clean channel. Your link and your neighbour's WiFi, video links and other backhaul all share the same spectrum.
Spectrum rules change over time and differ between bands. Check current ISED requirements, or work with a designer who does, before committing to equipment.
Unlicensed bands
The licence-exempt bands most often used for backhaul include:
- 5 GHz. The most common band for building-to-building links. Equipment is affordable and widely available, and range can be good. The band is also used by WiFi and many other outdoor links, so it can be crowded in cities and industrial areas.
- 60 GHz. Very high capacity over short distances. Oxygen absorbs 60 GHz energy, which limits range and also limits interference from distant links. Well suited to short campus hops and dense urban links.
- Other bands such as parts of the 24 GHz range are used by some equipment for short, high-capacity links.
Licensed bands
Licensed microwave links use a range of bands from a few gigahertz up to the tens of gigahertz. As a general pattern, lower bands reach further and are less affected by rain, while higher bands offer more capacity over shorter paths. Some very high bands, such as the 70 and 80 GHz range, have their own licensing arrangements that can be simpler than conventional microwave licensing; confirm the current process with ISED or your designer.
Side-by-side
| Factor | Unlicensed | Licensed |
|---|---|---|
| Interference | Possible at any time; no protection | Coordinated and protected |
| Lead time | Short; install when equipment arrives | Longer; frequency coordination and licence approval first |
| Up-front cost | Lower | Higher equipment and engineering cost |
| Ongoing cost | No licence fees | Annual licence fees |
| Predictability | Can degrade as the area gets busier | Stable over the life of the link |
| Best for | Short and medium links, quick deployments, non-critical paths, backups | Critical backhaul, long paths, carrier-grade links |
How to choose
Work through these questions:
- What happens if the link drops? If production, safety systems, security cameras or a whole site's phones depend on it, interference protection is worth paying for, or the link needs a solid backup.
- How busy is the spectrum? A spectrum scan at both ends shows how crowded the unlicensed bands are. A quiet rural site and a downtown rooftop are very different.
- How long and how fast? Long paths and high capacity requirements push toward licensed microwave or toward specific bands.
- How soon do you need it? If a site must be online in weeks, an unlicensed link may come first, with a licensed link following.
- What will the link cost over its life? Compare total cost over several years, including licence fees, not just equipment.
Whichever band you choose, the path must have clear line of sight and Fresnel zone clearance; see the Fresnel zone and line of sight.
Consider a hybrid. Many critical links pair two radios: a licensed link for guaranteed availability and an unlicensed or higher-band link for extra capacity, with the equipment failing over automatically. It is also common to back up a fibre or carrier circuit with an unlicensed wireless link.
Reducing risk on unlicensed links
- Scan the spectrum at both ends before choosing channels
- Use narrow-beam, high-gain antennas to reject signals from other directions
- Design with generous fade margin
- Choose radios that adapt modulation and can change channel
- Monitor signal quality and set alerts for sustained drops
- Have a backup path for anything critical
How ehZee can help
Our point-to-point wireless service begins with what the link must carry and what an outage would cost you, then uses a path survey and radio environment checks to recommend a band. For the basics of how links are built, see point-to-point wireless links explained.
Common questions
Do I need a licence to use 5 GHz outdoors?
Not for licence-exempt operation with certified equipment within the regulated limits. Those limits include power and, for some parts of the band, features such as radar detection. Installers must configure equipment correctly for Canada.
Who applies for the licence?
The licence is held by the operator of the link, usually the property owner or organization. The designer or integrator normally prepares the technical details and coordination for the application.