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  • 802.11ax introduction and measurement solution

  • Page

    Agenda

    IEEE 802.11ax

    ▪ 802.11ax overview & market

    ▪ 802.11ax technique / specification

    ▪ 802.11ax test items

    ▪ Keysight Product / Solution

    ▪ Demo M9421A VXT for 802.11ax

  • Page

    Wireless LAN today

    Technologies keep evolving to meet the

    newest requirements Fast Facts– 2 Mbps to >1 Gbps in 15 years

    – 5 M chipsets per day

    – 38 Billion connected devices by 2020

    – Average of 8 connected devices per

    household

    – $222 B in economic value / yr

    – 60% of mobile traffic uses Wi-Fi

    – 70% of all internet traffic uses Wi-Fi

    Source: Wi-Fi Alliance & various

    3

  • Page

    The Demand for High Efficiency Wi-Fi

    Dense Wi-Fi deployments

    Public access & offloading

    Outdoor use & extended range

    Large number of devices

    Targeting 4x throughput increase per station in dense environments over 11ac.

  • Page

    Evolution of 802.11 Standards

    Standard Frequency

    (GHz)

    Bandwidth

    (MHz)

    Modulation Max Data

    Rate

    802.11b 2.4 22 DSSS 11 Mbps

    802.11a 5 20 OFDM 54 Mbps

    802.11g 2.4 20 OFDM 54 Mbps

    802.11n 2.4, 5 20, 40 MIMO-OFDM 600 Mbps

    802.11ac 5 20,40,80,160 MIMO-OFDM 7 Gbps

    802.11ax 2.4, 5 20,40,80,160 MIMO-OFDM 10 Gbps

    802.11ad 60 2160 OFDM, SC 7 Gbps

    802.11ay 60 (2160) x2, x3, x4 OFDM, SC 20 Gbps

    Note: Capacity is the key performance metric for Wi-Fi instead of theoretical peak rate.

  • Page

    802.11ax standard progress – P802.11ax/D1.3

    KE

    YS

    IGH

    T C

    ON

    FID

    EN

    TIA

    L

  • Page

    IEEE 802.11ax vs. 802.11acHow is it different from 802.11ac?

    75

    Multi-user with OFDMA and SDMA

    KE

    YS

    IGH

    T C

    ON

    FID

    EN

    TIA

    L

    802.11ac 802.11ax

    Frequency Band 5 GHz 2.4 GHz and 5 GHz

    Bandwidths20 MHz, 40 MHz, 80 MHz

    Optional: 160 MHz, 80+80 MHz

    20 MHz, 40 MHz, 80 MHz

    Optional: 160 MHz, 80+80 MHz

    Modulation Type Up to 256QAM(MCS8/9) Up to 1024QAM(MCS10/11)

    FFT Size64, 128, 256, 512

    Sub-carrier space as 312.5 kHz

    256, 512, 1024, 2048

    Sub-carrier space as 78.125 kHz

    OFDM Duration 3.2us + 0.8/0.4us CP 12.8 us + 0.8/1.6/3.2us CP

    Multi-user

    technology

    MU-MIMO (DL),

    up to 8 spatial streams

    OFDMA + MU-MIMO (UL & DL),

    up to 8 spatial streams

    Data Rate Up to 7 Gbits/s (WAVE 2) Up to 10 Gbit/s

    Key Performance

    Indicators (KPI)

    Peak rate driver

    • Link throughput

    • Aggregate throughput

    User experience driver

    • Average per station throughput

    • Area throughput

    • Power efficiency

  • Page

    Key Features of 802.11axDesigned for high density connectivity with high overall capacity

    • Supports simultaneously serving lots of devices per AP

    • Increases capacity and efficiency

    • Improves device battery life

    Uplink resource scheduling

    • Efficiently serves multiple traffic types with multiple APs on shared channels

    • MAC enhancements support newly introduced mechanisms

    MU-MIMO and OFDMA

    • Provide increased efficiency

    Long OFDM symbols & higher order modulation

    • For improved coverage

    Extended guard interval coverage

  • Page

    802.11ax Multi user Scenario

    9

    KE

    YS

    IGH

    T C

    ON

    FID

    EN

    TIA

    L

    Source: Bellalta, Boris (2015). "IEEE 802.11ax: High-Efficiency WLANs,"

  • Page

    OFDMA in 802.11ax

    – OFDMA can maximize the resource utilization and multiplexing flexibility

    (both frequency and time domain can be multiplexed)

    – OFDMA Tone Plan

    • 1024 FFT in 80 MHz (4x symbol rate vs. 802.11ac)

    • Guard Interval: 0.8 us, 1.6 us, and 3.2 us to cover both indoor and

    outdoor operation

    • One user can allocated from Min. 26 tone to Max. 996 tone

    10

    Traditional OFDM only

    multiplex in frequency

    domain

    OFDMA can multiplex in

    both frequency and time

    domain

    KE

    YS

    IGH

    T C

    ON

    FID

    EN

    TIA

    L

  • Page

    – Increase network efficiency by multiplexing users in both frequency

    and space

    20

    MH

    zPHY

    Header

    Time

    Freq

    Space

    20

    MH

    z

    STA#10

    STA#35

    STA#54

    STA#26

    Sub-

    Band

    OFDMA

    STA #3

    STA #8

    STA #19

    SS 1,2

    SS 3,4,5

    SS 6

    MU-MIMO

    Technical HighlightsMulti-user support: MU-MIMO and OFDMA

    Frames are transmitted employing either OFDMA, MU-MIMO or a mixture of both

    Image courtesy of Wi-Fi Alliance

  • Page

    802.11ax Performance Enhancements vs. 802.11ac/n

    Higher network throughput

    • Particularly in crowded environments

    Increased link efficiency

    • Modulation

    • Guard interval

    Improved outdoor operation

    • Guard interval

    • Preamble

    • Frequency diversity gain

  • Page

    802.11ax AP & STA Test Challenge

    13

    – EVM Test requirement

    • Better than -50dB performance for chipset & PA characterization

    • Better than -48dB performance for 8x8 device validation

    - With 8-stream running in parallel under worst case test conditions

    - At source power levels up to 5 dBm across a dynamic range over 25 dB

    – Higher order 8x8 MIMO test requirement

    • AP designs may have 12+ antennas (8 for 5GHz band, 4 for 2.4GHz band and

    others)

    • More Challenging Test Scenario for 8 Streams @ 5GHz band, 1024QAM, 80MHz,

    Preamble

    • Independent source and analyzer to work on different frequencies

    – OTA test need higher power output

    – Support DL/UL MU – OFDMA _ MU-MIMO

    QCA VXT Training

    Aug.2016

  • Page

    Software HW – SISO HW - 2x2, 3x3, 4x4, 8X8 MIMO

    KE

    YS

    IGH

    T C

    ON

    FID

    EN

    TIA

    L

    Keysight Solution in 802.11ax – R&D/DVT/MFG

  • Page

    802.11ax Tx measurement requirement

    15

    802.11ax D1.3 Test Sec. 28.3.18

    KE

    YS

    IGH

    T C

    ON

    FID

    EN

    TIA

    L

  • Page

    802.11ax Tx Modulation Accuracy Measurement

    16

    KE

    YS

    IGH

    T C

    ON

    FID

    EN

    TIA

    L

  • Page

    802.11ax 多用户信号生成和分析K

    EY

    SIG

    HT

    CO

    NF

    IDE

    NT

    IAL

  • Page

    802.11ax 8X8 MIMO with Blocker Configuration

    (Blocker is optional used for rejection test)

    8x8 MIMO

    1. Blocker for receiver Adjacent/Non-

    adjacent channel rejection test

    2. Use 1 M9421A to transmit interference

    signal as signal generator

    KE

    YS

    IGH

    T C

    ON

    FID

    EN

    TIA

    L

  • Page

    Best-in-Industry 802.11ax 8x8 MIMO Test Solution

    Keysight

    Confidential

    KE

    YS

    IGH

    T C

    ON

    FID

    EN

    TIA

    L

  • Page

    802.11ax Rx measurement requirement

    20

    802.11ax D1.3 Test Sec. 28.3.17

    KE

    YS

    IGH

    T C

    ON

    FID

    EN

    TIA

    L

  • Page

    Signal Studio N7617B for 802.11ax Signal Generation

    21

    What we have ?

    ✓ HE PPDU mode

    ✓HE SU-PPDU

    ✓HE extended range SU-PPDU

    ✓HE MU-PPDU / OFDMA & MIMO

    ✓HE Trigger Frame (UL MU Scheduling)

    ✓HE Trigger-based PPDU

    * Beta forUL OFDMA, can be used with Waveform Creator (WFC) for UL MU signal generation

    ✓ Subcarrier spacing 78.125kHz

    ✓ SISO and up to 8x8 SU MIMO

    ✓ BW20/40/80/80+80/160

    ✓ MCS0-11 up to 1024QAM for 11ax/ac

    ✓ DCM

    OFDMA

    Cofig

    Multiple User

    Config

    KE

    YS

    IGH

    T C

    ON

    FID

    EN

    TIA

    L

  • Page

    User Equipment（STA）802.11ax Tx measurement

    22

    802.11ax D1.3 sec. 28.3.14

    KE

    YS

    IGH

    T C

    ON

    FID

    EN

    TIA

    L

  • Page

    Transmit requirements for an HE trigger based PPDU as 802.11ax D1.0 spec

    KE

    YS

    IGH

    T C

    ON

    FID

    EN

    TIA

    L

  • Page

    802.11ax AP/STAs DL/UL MU scenario

    24

    KE

    YS

    IGH

    T C

    ON

    FID

    EN

    TIA

    L

  • Page

    802.11ax MU Signal Generation and Analysis

    25

    KE

    YS

    IGH

    T C

    ON

    FID

    EN

    TIA

    L

  • Page

    Copyright © 2014 Agilent. All rights reserved

    Thank You !!!Questions and Answers

    26


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