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Title: WiFi6 - MU-MIMO and OFDMA [Print this page]

Author: huanglinjian@ru Time: 2022-5-5 15:53
Title: WiFi6 - MU-MIMO and OFDMA
OFDMA
OFDMA divides a radio channel into multiple sub-channels (subcharriers) to form frequency resource blocks. User data is carried on the resource blocks, instead of occupying the entire channel, so that multiple users can transmit data concurrently in the same time period.
Metaphorically speaking, in the orthogonal frequency division multiplexing (OFDM) scheme of Wi-Fi 5, goods are delivered by order, and one vehicle is dispatched for one order, even if the order just specifies one single piece of small item. In this case, the vehicle's compartment is often empty, leading to low efficiency and wasted resources. Comparatively, in the OFDMA scheme of Wi-Fi 6, a truck is not dispatched until it is fully loaded with goods of merged orders, so that much higher transmission efficiency is achieved.

MU-MIMO

MU-MIMO allows one router to communicate with multiple devices simultaneously.
Specifically, MU-MIMO of Wi-Fi 5 allows one router to communicate with four devices at a time and supports only downlink MU-MIMO. With better performance, MU-MIMO of Wi-Fi 6 allows one router to communicate with up to eight devices in the meantime and supports both uplink and downlink MU-MIMO.
In the preceding metaphorical example, such a difference means that four lanes on the road are increased to eight lanes, and vehicles (devices) no longer queue at and move through the same exit, but can simultaneously and efficiently move in or out on different lanes.

OFDMA vs. MU-MIMO
These two technologies are different though they have something in common: both enable multi-user uplink and downlink transmission and increase wireless access density. OFDMA and MU-MIMO are parallel transmission solutions and are complementary to each other. They comply with different technical theories and are applicable to different scenarios, and should be used based on service application types.

Author: sabbir.king.me@ Time: 2026-1-8 00:26
Sir in live chat ur engineer say only ofdma and bss colour support twt not support now u say all are support this are very confusing

Author: liuxiyang1@ruij Time: 2026-1-8 17:13

Sabbir Hossain replied at 2026-1-8 00:26
Sir in live chat ur engineer say only ofdma and bss colour support twt not support now u say all are ...

Hi sir,

May I know your device's model? I will check the function based on your device's model.

Best regards,
Steve

Author: sabbir.king.me@ Time: 2026-1-11 01:15

Steve replied at 2026-1-8 17:13
Hi sir,

May I know your device's model? I will check the function based on your device's model.

ruijie rg-ew3000gx

Author: lishujuan@ruiji Time: 2026-1-11 09:44

Sabbir Hossain replied at 2026-1-11 01:15
ruijie rg-ew3000gx

Dear Customer,
Based on the latest specification, RG-EW3000GX can support OFDMA, spatial reuse and quick BSS identification. But it currently not support "TWT for power saving" feature.

Best Regards,

Author: sabbir.king.me@ Time: 2026-1-19 17:30

GTAC-Shirley replied at 2026-1-11 09:44
Dear Customer,
Based on the latest specification, RG-EW3000GX can support OFDMA, spatial reuse and ...

Add this information router data sheet

Author: v-yuchen3@ruiji Time: 2026-1-19 18:06

Sabbir Hossain replied at 2026-1-19 17:30
Add this information router data sheet

Hi,
We have placed the necessary data in the data table, and the rest can be obtained by asking.

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