802.11ax introduction and measurement solution

Transcription

1 802.11ax introduction and measurement solution

2 Agenda IEEE ax ax overview & market ax technique / specification ax test items Keysight Product / Solution Demo M9421A VXT for ax

3 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

4 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.

5 Evolution of Standards Standard Frequency (GHz) Bandwidth (MHz) Modulation Max Data Rate b DSSS 11 Mbps a 5 20 OFDM 54 Mbps g OFDM 54 Mbps n 2.4, 5 20, 40 MIMO-OFDM 600 Mbps ac 5 20,40,80,160 MIMO-OFDM 7 Gbps ax 2.4, 5 20,40,80,160 MIMO-OFDM 10 Gbps ad OFDM, SC 7 Gbps ay 60 (2160) x2, x3, x4 OFDM, SC 20 Gbps Note: Capacity is the key performance metric for Wi-Fi instead of theoretical peak rate.

6 KEYSIGHT CONFIDENTIAL ax standard progress P802.11ax/D1.3

7 IEEE ax vs ac How is it different from ac? ac Multi-user with OFDMA and SDMA ax Frequency Band 5 GHz 2.4 GHz and 5 GHz Bandwidths 20 MHz, 40 MHz, 80 MHz Optional: 160 MHz, MHz 20 MHz, 40 MHz, 80 MHz Optional: 160 MHz, MHz Modulation Type Up to 256QAM(MCS8/9) Up to 1024QAM(MCS10/11) FFT Size 64, 128, 256, 512 Sub-carrier space as khz 256, 512, 1024, 2048 Sub-carrier space as 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 KEYSIGHT CONFIDENTIAL Key Performance Indicators (KPI) Peak rate driver Link throughput Aggregate throughput User experience driver Average per station throughput Area throughput Power efficiency 75

8 Key Features of ax Designed for high density connectivity with high overall capacity Uplink resource scheduling Supports simultaneously serving lots of devices per AP Increases capacity and efficiency Improves device battery life MU-MIMO and OFDMA Efficiently serves multiple traffic types with multiple APs on shared channels MAC enhancements support newly introduced mechanisms Long OFDM symbols & higher order modulation Provide increased efficiency Extended guard interval coverage For improved coverage

9 KEYSIGHT CONFIDENTIAL ax Multi user Scenario Source: Bellalta, Boris (2015). "IEEE ax: High-Efficiency WLANs," 9

10 OFDMA in ax 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 ac) 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 Traditional OFDM only multiplex in frequency domain KEYSIGHT CONFIDENTIAL OFDMA can multiplex in both frequency and time domain 10

11 20 MHz 20 MHz Technical Highlights Multi-user support: MU-MIMO and OFDMA Increase network efficiency by multiplexing users in both frequency Freq and space PHY Header OFDMA STA#10 STA#35 STA#26 STA#54 Sub- Band SS 1,2 STA #3 SS 3,4,5 STA #8 Time SS 6 STA #19 Space MU-MIMO Frames are transmitted employing either OFDMA, MU-MIMO or a mixture of both Image courtesy of Wi-Fi Alliance

12 802.11ax Performance Enhancements vs ac/n Higher network throughput Particularly in crowded environments Increased link efficiency Modulation Guard interval Improved outdoor operation Guard interval Preamble Frequency diversity gain

13 802.11ax AP & STA Test Challenge 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 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

14 KEYSIGHT CONFIDENTIAL Keysight Solution in ax R&D/DVT/MFG Software HW SISO HW - 2x2, 3x3, 4x4, 8X8 MIMO

15 KEYSIGHT CONFIDENTIAL ax Tx measurement requirement ax D1.3 Test Sec

16 KEYSIGHT CONFIDENTIAL ax Tx Modulation Accuracy Measurement 16

17 802.11ax 多用户信号生成和分析 KEYSIGHT CONFIDENTIAL

18 KEYSIGHT CONFIDENTIAL ax 8X8 MIMO with Blocker Configuration (Blocker is optional used for rejection test) 8x8 MIMO 1. Blocker for receiver Adjacent/Nonadjacent channel rejection test 2. Use 1 M9421A to transmit interference signal as signal generator

19 KEYSIGHT CONFIDENTIAL Best-in-Industry ax 8x8 MIMO Test Solution Keysight Confidential

20 KEYSIGHT CONFIDENTIAL ax Rx measurement requirement ax D1.3 Test Sec

21 21 Signal Studio N7617B for ax Signal Generation 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 BW20/40/80/80+80/160 Multiple User Config OFDMA Cofig KEYSIGHT CONFIDENTIAL Subcarrier spacing kHz MCS0-11 up to 1024QAM for 11ax/ac SISO and up to 8x8 SU MIMO DCM

22 KEYSIGHT CONFIDENTIAL User Equipment(STA)802.11ax Tx measurement ax D1.3 sec

23 KEYSIGHT CONFIDENTIAL Transmit requirements for an HE trigger based PPDU as ax D1.0 spec

24 KEYSIGHT CONFIDENTIAL ax AP/STAs DL/UL MU scenario 24

25 KEYSIGHT CONFIDENTIAL ax MU Signal Generation and Analysis 25

26 Thank You!!! Questions and Answers 26 Copyright 2014 Agilent. All rights reserved