WiFi 6 made networks more efficient when many devices share them. WiFi 6E brought the same technology into the new 6 GHz band. WiFi 7 adds wider channels, faster data rates and the ability to use more than one band at once. For most buildings, the practical gains come from efficiency and clean spectrum, not headline speeds.
The names and the standards
The Wi-Fi Alliance introduced simple generation names to replace the IEEE standard numbers:
| Name | IEEE standard | Bands |
|---|---|---|
| WiFi 5 | 802.11ac | 5 GHz |
| WiFi 6 | 802.11ax | 2.4 and 5 GHz |
| WiFi 6E | 802.11ax | 2.4, 5 and 6 GHz |
| WiFi 7 | 802.11be | 2.4, 5 and 6 GHz |
WiFi 6: efficiency in busy spaces
Earlier generations focused on making a single connection faster. WiFi 6 focused on making a crowded network work better. Its main features include:
- OFDMA, which lets an access point split a channel and serve several devices in one transmission. This cuts waiting time when many devices send small amounts of data, such as in offices, schools and warehouses.
- Multi-user MIMO improvements, allowing an access point to send to, and receive from, several devices at once using separate spatial streams.
- BSS colouring, which helps access points tell their own traffic from a neighbour's on the same channel, so they can be less cautious about transmitting when the neighbour is far away.
- Target wake time, which schedules when devices wake to communicate, helping battery-powered devices and sensors last longer.
- Higher-order modulation, which increases peak speed when signal quality is very good.
The benefits grow as more of the devices on the network support WiFi 6. Older devices still work, but they do not use the new features.
WiFi 6E: a new band
WiFi 6E is WiFi 6 extended into the 6 GHz band, which Canada has opened for licence-exempt use. The technology is the same; the difference is the spectrum. 6 GHz offers many more channels, room for wide channels, and an airspace free of older devices. It also requires WPA3 security. The trade-off is shorter range than 5 GHz, so coverage needs to be checked separately. See 2.4, 5 and 6 GHz: choosing WiFi bands.
WiFi 7: wider, faster, multi-link
WiFi 7 builds on WiFi 6E with several additions:
- Multi-link operation (MLO), which lets a device connect over more than one band at the same time, or switch between them quickly. This can improve reliability and reduce delay for demanding applications.
- 320 MHz channels in the 6 GHz band, doubling the widest channel available in WiFi 6E. Useful where spectrum is clean and density is low; less useful in crowded buildings where narrower channels allow more reuse.
- Higher-order modulation (4096-QAM), which raises peak rates when signal quality is excellent, usually close to the access point.
- More flexible channel use, allowing an access point to keep using most of a wide channel even if part of it has interference.
What actually matters for a building
Headline speeds are measured in ideal conditions that rarely exist in a real building. In practice, the useful questions are:
- Do our key devices support WiFi 6, 6E or 7, and when will they be replaced?
- Is the network struggling with density, where WiFi 6 efficiency features help most?
- Would clean 6 GHz spectrum relieve a congested 5 GHz network?
- Can the switches, cabling and Power over Ethernet support new access points?
- How long will new access points stay in service, and what devices will appear during that time?
New access points often need more power than old ones, and faster radios can exceed a 1 Gb/s uplink. Check Power over Ethernet (PoE) budgets and cabling before ordering.
Planning an upgrade
- Inventory the devices. List the device types that depend on the network, the WiFi generation and bands each supports, and when each is due for replacement.
- Identify the problem you are solving. Density, congestion on 5 GHz, roaming, coverage gaps or simply end-of-life equipment each lead to different priorities.
- Check the wired side. Confirm switch ports, uplink speeds, PoE budgets and cable categories for each new access point location.
- Revisit the design. Survey the current network and decide whether access points stay in the same places. A move to 6 GHz often means more, or differently placed, access points.
- Plan the change-over. Decide whether to replace floor by floor or all at once, and how to avoid mixing generations in ways that confuse roaming.
- Validate each band. Survey 2.4, 5 and 6 GHz separately after installation.
A worked example
An office replaced its access points with WiFi 6 models several years ago and now has complaints of congestion in a large open area and training rooms. Most staff laptops bought in the last couple of years support 6 GHz, while desk phones and some shared devices do not.
Rather than replacing everything at once, the organization starts with the congested areas. The survey shows that 6 GHz access points in the existing positions would leave gaps, so the design adds a few locations in the open area. The switches serving those areas are checked for PoE capacity and uplink speed, and two are replaced. After installation, the 6 GHz-capable laptops move to the new band, the remaining devices have more room on 5 GHz, and the validation survey confirms coverage in each band. The rest of the building is planned for its normal replacement cycle.
New hardware does not fix a poor design. Access points in the wrong places, overlapping channels and excessive power will hold back WiFi 7 as much as WiFi 5. An upgrade is the right time to revisit the design.
How ehZee can help
We help you decide whether, when and how to upgrade, starting with why you need a change and which devices depend on the network. Our WiFi design and build service covers the design, cabling and power checks, installation and a validation survey across every band you use.
Common questions
Will WiFi 7 make our network faster?
For WiFi 7 devices close to an access point in clean spectrum, yes. For the network as a whole, gains depend on design, device mix and the internet connection. Many networks see more benefit from fixing the design than from new hardware.
Do older devices still work on new access points?
Yes. New access points support older devices, but those devices use older, less efficient methods and do not benefit from the new features.
Does multi-link operation need anything special from the network?
It needs WiFi 7 access points and WiFi 7 client devices that support it, and good coverage on each band the device will use. Because a multi-link device can use 5 and 6 GHz together, the design should check both bands in the areas where those devices work, and the wired uplink should have the capacity to carry the combined traffic.
Should we skip WiFi 6E and wait for WiFi 7?
If you are buying now, WiFi 7 equipment supports 6 GHz as well. The more important decisions are coverage, capacity, cabling and power, which apply to both.