When the Wi-Fi does not reach the bedroom or the garden, the solution most often suggested is a mesh system. It works well in many cases, but it is not magic: a badly placed mesh system can make the network slower than before. Knowing how the nodes communicate with each other lets you get the most out of these devices, or understand when another approach is better.
Three ways to extend Wi-Fi
| Solution | How it works | Pros | Cons |
|---|---|---|---|
| Repeater (range extender) | Receives the signal and retransmits it, often under a different network name | Cheap, instant | Often halves bandwidth, separate management, poor roaming |
| Mesh system | Several coordinated nodes forming a single network | One name, guided roaming, central management | Higher cost, performance tied to backhaul |
| Wired access points | Each access point is connected via Ethernet | Best performance and stability | Needs cables to the rooms |
How a mesh network works
A mesh system consists of a main node, connected to the router or acting as the router itself, and satellite nodes spread around the home. They all broadcast the same network, with the same name and password, and are managed from a single app or interface.
The key point is the backhaul, the link between the nodes. Every bit of data a device sends to a satellite has to reach the main node and then the Internet. The backhaul can be:
- shared radio: the nodes talk to each other on the same band used by devices. Airtime is split, and every hop reduces performance;
- dedicated radio: tri-band systems reserve one band, often 5 or 6 GHz, for node-to-node traffic, leaving the others to devices. It is much more efficient;
- wired (Ethernet backhaul): the nodes are connected by cable. This is the best option: each node effectively becomes an access point with full bandwidth to the router, while keeping the benefits of mesh management.
If the home has even one or two network cables running to the farthest rooms, use them for backhaul.
Roaming: moving from one node to another
As you walk around the house with your phone, the device should latch on to the nearest node. In reality the decision belongs to the device, which tends to stay attached to its current node even when the signal becomes weak.
Mesh systems help it with dedicated standards:
- 802.11k: gives the device a list of nearby nodes;
- 802.11v: lets the network suggest that the device move;
- 802.11r (Fast Transition): speeds up the handover, useful for Wi-Fi voice calls.
Some older devices handle 802.11r poorly: if you notice disconnections, try turning it off.
Where to place the nodes
The most common mistake is putting the satellite exactly where there is no signal. A node that receives poorly from the main unit will have a slow backhaul, and will broadcast an excellent signal... to a slow connection.
Practical rules:
- Place the satellite halfway between the main node and the area to cover, where the main node's signal is still good.
- Avoid hiding nodes inside furniture, behind the TV, or near large metal surfaces, mirrors or aquariums.
- Keep them high and in the open: a shelf is better than the floor.
- Consider building materials: reinforced concrete, stone walls and underfloor heating attenuate heavily, especially at 5 and 6 GHz.
- Use the system's app, which often shows the quality of the link between nodes, and move the satellite until it is at least "good".
How many nodes you need
More nodes do not always mean a better network. With radio backhaul, a chain of three nodes in a row sends the last node's traffic through two radio hops. A star layout, with every satellite connected directly to the main node, is better. In an average-sized home, two or three well-placed nodes are almost always enough.
Mesh and the provider's router
If the mesh system also acts as the router, it is best to put the provider's router into bridge mode, or configure the mesh in access point mode, to avoid double NAT. Also turn off the Wi-Fi on the provider's router: two networks on the same channels interfere with each other.
When it is not the answer
- In a small flat where the problem is interference from neighbours, changing channel or moving to 6 GHz is the better fix.
- If you can run cables, wired access points give better results for the same money.
- If only one fixed device, such as a TV or console, connects poorly, a cable or a powerline adapter may be enough.
In short
- A mesh system creates a single network from several coordinated, centrally managed nodes.
- Performance depends on the backhaul: dedicated is better, wired is better still.
- Place satellites where the main node's signal is still good, not where it is missing.
- Prefer a star layout and a few well-placed nodes.
- Avoid double NAT and turn off the provider router's Wi-Fi if you use mesh.
