5G Fixed Wireless Access (FWA): Broadband Without the Cable

Fixed wireless is not a new idea. Wireless ISPs have used point to point and point to multipoint radio for rural broadband for decades. What 5G changes is scale. Every mobile network now has a dense grid of masts with a lot of spare capacity in the n78 band, and selling some of that capacity as fixed broadband makes commercial sense. For the customer, it means a broadband connection that can be live in a day rather than in three months.

How 5G FWA works

The premises gets a 5G router or customer premises equipment, known as CPE. That device connects to the mobile network like a phone would, using a SIM. It then provides Ethernet and usually Wi-Fi to the building.

The difference from a phone hotspot is that FWA equipment is designed to stay in one place and carry broadband-level traffic. It has better antennas, more receive paths, often an outdoor mounting option, and the network may treat it differently, for example by allocating it to particular cells or tariffs.

Indoor versus outdoor FWA equipment

Indoor 5G routers are simple to install. Put the router near a window facing the mast and plug it in. This works well where the signal is strong. It struggles in buildings with thick walls, metallised glass or no line of sight to a mast.

Indoor router with external antenna adds a four-port antenna mounted outside, connected to the router by short cables. This is a good middle ground, especially for business routers with external connectors.

Outdoor 5G CPE puts the whole modem and antenna in a weatherproof unit on the outside of the building, powered over a single Ethernet cable. There is no coax loss at all, and the antennas are high gain and can be aimed. In weaker signal areas this is usually the best performer. See outdoor 5G routers.

What speeds to expect

FWA speeds depend on the signal at the premises and how busy the cell is. With a good n78 signal and outdoor equipment, hundreds of megabits down and tens of megabits up are common. With a weaker or lower band 5G signal, expect something closer to a good 4G connection. In 4G-only areas, FWA is still possible but behaves like 4G broadband.

The important differences from fibre are:

• Variability. Performance changes through the day as other users load the cell.
• Upload. Upload is normally much lower than download, as with most broadband.
• Latency. Higher than fibre but fine for calls, video and normal business use. Standalone 5G improves this.
• Capacity management. Operators may limit the number of FWA customers in a cell to protect mobile users.

Consumer FWA and business FWA

The UK networks sell 5G home broadband as a consumer product, with a locked router and a simple monthly plan. These can work well for homes and very small businesses, but they are not designed for business use. Typical limitations include a locked consumer router with no external antenna option, no fixed IP, limited control over the firewall and no service level agreement.

Business FWA uses a business-grade router or outdoor unit, a business SIM with the right data allowance and IP type, and often failover to a second network or a fixed line. It costs more but behaves like a proper business connection.

Where 5G FWA makes sense

Rural premises without decent fixed broadband, where a 5G mast is within reach. Outdoor CPE often makes a dramatic difference here.

New premises waiting for a fixed line. FWA can run the business from day one, then become the backup once the line arrives.

Temporary sites such as construction offices, events, film shoots and pop-up retail.

Multi-site businesses wanting faster rollout and a single connectivity approach across all sites, regardless of local fixed line options.

Businesses wanting diversity. A 5G FWA connection alongside fibre gives two completely independent routes to the internet. See 5G backup and failover.

Where it does not

FWA is a weaker choice where full fibre is available and affordable, where the site needs very high sustained upload, where the 5G signal is poor and cannot be improved with an outdoor unit, or where the business depends on hosting services inbound and cannot use a fixed IP SIM. It can still be a backup in all of those cases.

Surveying for FWA

Success depends almost entirely on the signal at the premises, so a survey is worth doing. Check:

• which networks have 5G at the property, and on which bands
• signal quality outdoors at likely mounting points, not just indoors
• direction to the serving mast, so a directional antenna can be aimed if needed
• speed and latency at different times of day
• cable routes from the mounting point to the router or PoE injector

Use a device that reports RSRP, RSRQ and SINR. A strong RSRP with poor SINR usually means interference from neighbouring cells, which a directional antenna can often fix.

Antennas for FWA

For an indoor router with external connectors, a four-port MIMO antenna is the starting point. Omnidirectional antennas are simple and pick up whichever mast is best. Directional panel antennas give more gain towards one mast and reject interference from others, but need aiming and may need re-aiming if the network changes. See the 5G antenna guide.

Outdoor CPE has the antennas built in. Some units can be rotated or tilted to point at the mast. Many have alignment tools in their interface that show signal quality as you adjust them.

Data and tariffs

FWA used as primary broadband needs a lot of data. Most business premises will use hundreds of gigabytes a month, and some much more. Unlimited or high allowance business tariffs are the norm for this use. Check fair use policies, any speed caps on the tariff, and whether the SIM is permitted for use in a fixed router rather than a phone, as some tariffs restrict this.

Fixed IP on FWA

Standard FWA connections use private IP addresses behind carrier-grade NAT. That is fine for normal internet use. If you need to host services, accept VPN connections or be whitelisted by a supplier, you need a SIM with a fixed public IP or a VPN service that provides one. See public and static IP on 5G.

FWA and the 5G standalone future

As networks expand standalone 5G, FWA should become more predictable. SA brings more consistent latency and the possibility of service tiers through network slicing. Some operators may eventually offer FWA products with guaranteed capacity or priority. Choosing equipment that supports SA now keeps that option open.

Rural FWA in practice

Rural sites are where FWA can make the biggest difference, and also where it needs the most care. Masts are further away, low band 5G and 4G often dominate, and the n78 band may only reach the property in favourable conditions. A few patterns tend to hold:

Height helps more in rural areas than in towns, because the obstacles are hedges, trees and terrain rather than other buildings. A unit on a gable end or a short pole above the roof line often gains a lot.

Directional antennas or outdoor units with directional antennas are usually worth it, because there is often one clear mast to aim at and little interference to worry about.

Seasonal change is real. Trees in full leaf absorb more signal than bare branches. A site surveyed in February may perform differently in July, so allow some margin.

Multiple networks are worth testing. In rural areas the difference between networks can be stark, and it is not unusual for the network with the worst reputation locally to have the best signal at a particular property.

FWA as part of a hybrid connection

FWA does not have to be all or nothing. Many businesses run FWA alongside an existing slow fixed line, with the router sending bulk traffic over 5G and keeping the fixed line as backup, or splitting traffic by type. Others combine FWA with a second FWA connection on a different network for resilience. Routers that support multiple WAN connections, policy routing and health checks make these setups straightforward.

Is 5G FWA reliable enough for business?

It can be, with the right design. A properly installed outdoor unit on a good signal, with a business SIM and failover to a second network or a fixed line, is a dependable business connection. A consumer router on a windowsill is not. The technology is the same, the result depends on the engineering.

For help assessing a site for 5G FWA, email sales@5grouter.co.uk with the postcode and what the connection needs to support.