Wi-Fi 6 (802.11ax) matters for embedded products, but not because of the 9.6 Gbps figure on router boxes. That number assumes 8 spatial streams on a 160 MHz channel. Most IoT modules run one or two streams. A 1x1 radio on a 20 MHz channel tops out at a 143 Mbps PHY rate, and real throughput lands well below that.
What Wi-Fi 6 does change for a connected product is how it behaves on a busy network, how long it runs on a battery, and how it is secured. This post covers those differences, what CEL measured in the field, and which CEL modules fit which job. For a primer on the 802.11ax features themselves, see Wi-Fi 6 Benefits.
Wi-Fi 5 vs Wi-Fi 6 at a Glance
| Wi-Fi 5 (802.11ac) | Wi-Fi 6 (802.11ax) | |
|---|---|---|
| Bands | 5 GHz only | 2.4 GHz and 5 GHz (6 GHz is Wi-Fi 6E) |
| Highest modulation | 256-QAM | 1024-QAM |
| Multi-user access | Downlink MU-MIMO, up to 4 users | OFDMA, plus uplink and downlink MU-MIMO up to 8 users |
| Power saving | Legacy power save | Target Wake Time (TWT) |
| Neighbor network interference | No mitigation | BSS Coloring |
| Security | WPA2 required, WPA3 optional | WPA3 required for Wi-Fi CERTIFIED 6 |
| Peak PHY rate, 1 stream, 80 MHz | 433 Mbps | 600 Mbps |
What Changes for an Embedded Device
2.4 GHz Gets the New Features
802.11ac only runs on 5 GHz. Wi-Fi 6 runs on both bands, so a Wi-Fi 6 device gets OFDMA, TWT and BSS Coloring on 2.4 GHz too. 5 GHz carries more data close to the access point. 2.4 GHz reaches farther and gets through walls and vehicle bodies better.
CEL’s trailer field test shows the trade. At the front of the trailer, the CMP9605 ran 41.0 Mbps on 5 GHz and 15.3 Mbps on 2.4 GHz. At the rear roofline, 50 ft out, the order flipped: 3.5 Mbps on 2.4 GHz against 2.1 Mbps on 5 GHz. A dual-band design lets the product use whichever band works at its location.
OFDMA and BSS Coloring Help on Crowded Networks
OFDMA splits a channel into resource units, up to 9 per 20 MHz, so the access point can serve several clients in one transmission. Small, frequent packets from sensors and controls stop waiting behind each other.
BSS Coloring tags each frame with a network ID. When a radio hears a weak frame from a neighboring network, it can transmit anyway instead of backing off. That matters in apartment buildings, offices and job sites where dozens of networks share the same channels.
Both features need an 802.11ax access point. On a Wi-Fi 5 access point, a Wi-Fi 6 module falls back to 802.11ac or 802.11n behavior.
TWT Saves Power, at a Latency Cost
Target Wake Time lets a device and access point agree on a wake schedule. The radio sleeps until its slot, which cuts average current for battery-powered sensors. The cost is latency. Data for a sleeping device waits for its next wake window. Use TWT for periodic reporting, not for anything that has to react in milliseconds. The CMP9605, CMP961x and CMP9670 support TWT.
WPA3 Is Required
The Wi-Fi Alliance requires WPA3 for Wi-Fi 6 certification. WPA3-Personal replaces the WPA2 pre-shared key handshake with SAE, which blocks offline dictionary attacks against a captured handshake. Encryption stays 128-bit AES. WPA3-Enterprise adds an optional 192-bit mode. Protected Management Frames are mandatory, which stops the deauthentication attacks used to knock devices off a network.
What CEL Measured
CEL tested three Wi-Fi 6 modules streaming from a trailer to an access point in the truck cab, with 89 other access points in range. The host was an NXP i.MX93 running Debian, and throughput was measured with iperf over UDP. A 1080p30 video stream needs about 4 Mbps.
| Module | Front of trailer, 5 GHz | Front of trailer, 2.4 GHz |
|---|---|---|
| CMP9605 | 41.0 Mbps | 15.3 Mbps |
| CMP9610 | 47.2 Mbps | 16.2 Mbps |
| CMP9611 | 251.4 Mbps | 41.0 Mbps |
All three clear the video floor on either band. The CMP9611 supports 80 MHz channels, which gives it about 5x the 5 GHz throughput of the two 20 MHz modules. Full results, including rear-of-trailer positions: Wi-Fi 6 Trailer Streaming Field Test (PDF).
A second test ran in a basement with 2 ft fieldstone walls and about 75 competing networks. At 15 ft from the access point, the CMP9611, CMP9610 and CMP9605 measured 349, 90 and 26 Mbps on 5 GHz. Details: Wi-Fi 6 Module RF Performance (PDF).
Which CEL Wi-Fi 6 Module Fits
| Module | Radio | Max channel width | Bluetooth |
|---|---|---|---|
| CMP9605 | TI CC3351, 1x1 | 20 MHz | BLE 5.4 |
| CMP9610 | NXP IW610G, 1x1 | 20 MHz | BLE 5.4 |
| CMP961x | NXP IW611 / IW612, 1x1 | 80 MHz | BLE 5.4 |
| CMP9620 | NXP 88W9098, 2x2 | 80 MHz (1.2 Gbps PHY) | Bluetooth 5.3 |
| CMP964x | 2x2 and 4x4, 4.9 GHz public safety band | 160 MHz | None |
| CMP9670 | Qualcomm QCA2066, 2x2, Wi-Fi 6E | 160 MHz | Bluetooth 5.3 |
The 20 MHz modules suit sensors, controls and low-rate video. Pick the CMP961x when a single-stream design needs more throughput. The CMP9620, CMP964x and CMP9670 are PCIe modules for Linux gateways and multi-stream video.
When Wi-Fi 5 Is Still Fine
Wi-Fi 6 radios connect to Wi-Fi 5 and Wi-Fi 4 access points. On those networks you lose OFDMA, TWT and BSS Coloring, but the product works. New access points ship as Wi-Fi 6 or later, so a Wi-Fi 6 design covers both the installed base and what customers will install next.
Questions on module selection or antenna layout? Use the form below and a CEL engineer will follow up.