thinQmaster Virtual testing partner Adaptive practice exams that find your weak spots and drill them. Every answer explained. From $69
Enroll

thinQmaster

Find your exam

Five questions free, before you decide.

Step 1 · choose a vendor

In one of our camps? Your practice exams come with the tuition — they are on your study page already.

Wireless & Mobility · Intermediate

Resource Unit (RU)

A group of OFDMA subcarriers (tones) allocated to one user in an 802.11ax/be transmission.

Definition

RU sizes are 26, 52, 106, 242, 484, 996, and 2x996 tones. A 20 MHz channel can be divided into up to nine 26-tone RUs. The AP schedules which clients receive which RUs.

Example

A 20 MHz OFDMA frame serves nine IoT clients using 26-tone RUs.

Exam tip

Smallest RU is 26 tones (about 2 MHz).

Related terms