Improving ax Performance in Real World by Comprehensive Test Solution

Transcription

1 Improving ax Performance in Real World by Comprehensive Test Solution Brian Su, Sr. Project Manager Ben Ling, Business Development, Keysight

2 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. 2

3 H O W I S I T D I F F E R E N T F R O M A C? Multi-user with OFDMA and SDMA ac 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 Key Performance Indicators (KPI) Peak rate driver Link throughput Aggregate throughput User experience driver Average per station throughput Area throughput Power efficiency 3

4 New Features in ax 4

5 F E AT U R E 1 : N A R R O W E R S U B C A R R I E R S PA C I N G A N D L O N G E R S Y M B O L S Improve spectral efficiency and coverage khz n/ac Guard interval (GI): 0.4 µs, or 0.8 µs 3.2 µs (1/312.5k Hz) time One OFDM Symbol = up to 4 µs frequency khz Guard interval (GI): 0.8 µs, 1.6 µs, or 3.2 µs ax 12.8 µs (1/ khz) One OFDM Symbol = up to 16 µs time frequency 5

6 F E AT U R E 2 : O P E R AT I O N I N M O R E F R E Q U E N C Y B A N D S af b/g/n/ac/ax a/n/ax ad/ay 0 Hz 6 GHz 70 GHz ah p Unlicensed Licensed 20 MHz Channels 40 MHz Channels 80 MHz Channels 160 MHz Channels 5935 MHz 6095 MHz 6255 MHz 6415 MHz 6575 MHz 6735 MHz 6895 MHz 7055 MHz 6

7 Sub-carriers (frequency) Sub-carriers (frequency) F E AT U R E 3 : O F D M A E N A B L E S M U LT I - U S E R M O D E OFDM OFDMA Resource Unit (RU) User 1 User 2 User 3 Channel bandwidth 1RU = minimum 26 tones (~2 MHz), maximum 996 tones (~80 MHz) Symbols (Time) OFDM (current Wi-Fi): At a given time, a single user gets the full bandwidth, independent of packet size. Each device waits its turn to transmit Symbols (Time) OFDMA (802.11ax): At a given time, multiple users share the available bandwidth (up to 9 users in a 20 MHz channel) 7

8 F E AT U R E 3 : O F D M A E N A B L E S M U LT I - U S E R M O D E Legacy Preamble HE Preamble L-STF L-LTF L-SIG RL-SIG HE-SIG-A HE-SIG-B HE- STF HE- LTF1... HE- LTFN HE data Packet extension (PE) 12 Guard Null Subcarriers Center 26-tone RU Null Subcarriers 11 Guard DC tones DC tones 1024 tones in 80 MHz BW (One tone = single subcarrier, spaced khz apart 8

9 F E AT U R E 4 : U P L I N K E F F I C I E N C Y I M P R O V E D W I T H O F D M A A N D S C H E D U L I N G SIFS SIFS = Short Interframe Space: 10 ms for 2.4 GHz band, 16 ms for 5 GHz band SIFS AP STA n (UL OFDMA and/or UL MU-MIMO) AP Trigger Frame STA 3 (UL OFDMA and/or UL MU-MIMO) STA 2 (UL OFDMA and/or UL MU-MIMO) STA 1 (UL OFDMA and/or UL MU-MIMO) A C K DL UL DL time Legacy Preamble HE Preamble L-STF L-LTF L-SIG RL-SIG HE-SIG-A HE- LTF1 HE- LTFN HE-STF... HE data PE HE Trigger-based PPDU sent by STAs to transmit UL OFDMA and/or MU-MIMO packet Note: All STAs must start transmitting at the same time and the packet length must be the same 9

10 F E AT U R E 5 : Q A M M O D U L AT I O N I N C R E A S E S D ATA T H R O U G H P U T 1024 QAM is optional in ac but it is mandatory in ax 11ax 8 spatial streams Mbps, compared with Mbps for ac 10

11 New Test Challenges for ax 11

12 T E S T C H A L L E N G E 1 : Q A M R E Q U I R E S B E T T E R E V M 1024 QAM needs more stringent requirement on EVM Prefer T&M instrument residual EVM floor should be -48 db above to meet R&D or DVT ax EVM requirements BOTH 2.4G & 5G BANDS AX MCS10/ QAM M9421A VXT Vector Transceiver PXIe module, which offers up to -50 db EVM on the source and - 49 db on the receiver for an 80 MHz bandwidth ax signal at 5.8 GHz. Residual EVM 256 QAM 1024 QAM -32 db -35 db* 12

13 T E S T C H A L L E N G E 2 : V E R I F Y I N G D O W N L I N K O F D M A A N D M U - MIMO OFDMA introduces many possibilities of ax packets Keysight software auto encode and decode the SIG-B for MU-PPDU 13

14 T E S T C H A L L E N G E 3 : U P L I N K O F D M A I N - B A N D E M I S S I O N S UL Trigger Based PPDU do not interference with each other Measure the in-band emissions 14

15 T E S T C H A L L E N G E 4 : T E S T I N G W L A N P E R F O R M A N C E W I T H C H A N N E L E M U L AT I ON Validate the real-world performance of ax feature Single Client with Access Point Multi-User MIMO Roaming Between Access Points 15

16 T E S T C H A L L E N G E 5 : T E S T I N G P E R F O R M A N C E / Q U A L I T Y C O V E R I N G L AY E R S ax require complex MAC layer interactions between the APs and STAs QoS in real-world environments, infrastructure-class networks need to be tested for throughput and capacity under a variety of loading conditions 16

17 E V O LV I N G F R O M A C T O A X Test Challenge: 1024QAM requires better EVM EVM Test Requirements 8x8 MIMO Testing for Design Validation Test Challenge: New Feature Verification downlink OFDMA and MU-MIMO Uplink OFDMA In-band emissions Test Challenge: Testing WLAN Performance with Channel Emulation Networking Verification: PHY and MAC Verification Real-world performance Verification: Channel Emulation 17

18 802.11ax Test Solutions Business Development/ Keysight Ben Ling

19 Customer Experience Management Keysight Classic Ixia Anite COMPONENTS & CHIPSETS DEVICES BASE STATIONS HYPERSCALE AND DATA CENTERS ENTERPRISE Layers 2-7 Mobile Device Test BTS Drive Test Drive Test Mobile Network Test Network Test, Visibility and Security Layer 1 Electrical, Optical and Wireless Test Channel Emulation 19

20 RF Test Solution from R&D to MFG 20

21 SW HW - Single Channel HW - 2x2, 4x4, 8X8 MIMO N7617B Signal Studio for WLAN N5182B MXG Signal Generator M9421A PXI VXT Vector Transceiver (n) N5182B MXG Signal Generators M9421A PXI VXT VSA Software N/M/V/Y9077A/B/C WLAN Application MXA Signal Analyzer UXA Signal Analyzer M9421A PXI VXT Vector Transceiver PXA Signal Analyzer E6640A EXM M9421A PXI VXT E6640A EXM 21

22 M A V X T V E C T O R T R A N S C E I V E R X-Client 8x8 MIMO With Blocking YOUR CHALLENGE Uplink OFDMA in-band emissions 1024QAM requires better EVM Verifying downlink OFDMA and MU-MIMO Blocking test VXT KEYSIGHT CAN HELP VXT H/W and F/W enable best-in-class PA & MIMO test performance with super accurate time synchronization and EVM algorithm. VSG and VSA both provide wide power range F/W optimization has enable VXT lead in test speed 22

23 H I G H P E R F O R M A N C E & C O M P L E T E F U N C T I O N All HE PPDU mode UL / DL MU HE SU-PPDU & HE MU-PPDU HE Triger based PPDU HE extended range SU-PPDU Best-in-Industry True MIMO Solution Perfect VSG / VSA performance Up to 8x8 True MIMO support Flexible configuration to be used as 8 of SISO, 4 of 2x2 MIMO, 2 of 4x4 MIMO independent system Ready Solution to test ax AP for DL / UL OFDMA & MU MIMO AP Tx: RF measurement on DL multi-user scenario AP Rx: Signal Generation on UL multi-user scenario OFDMA & MU-MIMO Independent CFO/SFO/Power for individual STAs Interactive/TBT Test 23

24 Companion Device Blocking Signal Source Splitter/ Combiner Directional Coupler DUT Spectrum Analyzer M9421A VXT as Blocking Signal Source WiFi GPS Radar for DFS Bluetooth LTE / LTE-A / W-CDMA ZigBee M9290A CXA-m PXIe Modular Signal Analyzer M9421A VXT as Companion AP/STA EN Test Requirement 24

25 Best-in-Industry ax 8x8 MIMO Test Solution ax Analog BBIQ Test Solution BB AWG M3201A BB Digitizer M3102A RF Transceiver M9421A BB AWG M3201A BB Digitizer M3102A Baseband I Output Baseband Q Output Baseband I Input Baseband Q Input Up Conv LO Up Conv PA LNA WLAN RFIC RF Transceiver M9421A M9421A VXT as Blocking Source WiFi GPS Radar for DFS Bluetooth LTE-A / W-CDMA ZigBee ax RED/Regulatory Test Solution M9290A CXA-m PXIe Modular Signal Analyzer ax PC Client Automation Test Solution M9421A VXT as Companion AP/STA 25

26 E A E X M W I R E L E S S T E S T S E T E6640A EXM LTE/LTE-A FDD/TDD, HSPA+, W-CDMA 1xEV-DO, cdma2000 GSM/EDGE/EDGE TD-SCDMA/TD-HSPA NB-IoT CAT-M WLAN a/b/g/n/j/p/ac/ah/ ax Bluetooth 1.0 to 5.0 ZigBee, Z-wave, Thread PHY , WiSUN (MR-FSK) Digital video, FM, Mobile WiMAX Multi-Satellite GNSS: GPS, Galileo, GLONASS, BeiDou, SBAS, QZSS 26

27 S T R O N G G L O B A L & L O C A L S U P P O R T CHIPSET VENDOR TOOL e.g. -Provided by Chipset vendor -Chipset specific -Limited setting flexibility -Support Keysight instrument as default KEYSIGHT SIGNAL CREATION & ANALYSIS TOOL e.g. X-App, VSA & Signal Studio -Develop by Keysight -Highest setting flexibility -No chipset control -Standard tool across Keysight HW platforms KEYSIGHT WLAN PC CLIENT & PLUG-IN -Develop by Keysight -Compliant to Spec -Optional Chipset control -East to use and powerful utility to address R&D needs KEYSIGHT CUSTOM ATE for DVT & MFG -Develop by Keysight -Customize chipset control -Customize for DVT/MFG -Customize shop floor control & report generation CUSTOMER TEST TOOL DEVELOPMENT -Develop by customer -Keysight instrument control documentation -Keysight local & remote engineering support 27

28 T5510S for Cellular + Wi-Fi Signaling Test Solution 28

29 WiFi is becoming an integral part of wireless communication Best efforts isolated WiFi testing misses real-world faults Cellular + WiFi needs comprehensive, verifiable interoperability and coexistence testing Combinations of licensed and unlicensed wireless spectrum in complex deployment scenarios, with WiFi in multiple bands Ad-hoc tests with commercial WiFi set-ups are unreliable, unrepeatable and slow; golden radio approaches are inflexible and static The problem: How to test Cellular and WiFi devices under complex real-world traffic and interference conditions? 29

30 H O T S P O T / C P E Cellular Hotspot / CPE 1. How well is WiFi working under a given set of LTE conditions (band, channel)? 2. How does WiFi performance change as LTE conditions change? 3. With a set of WiFi conditions (clients, applications, channel), is the device able to get the throughput it needs from LTE? Is it consistent? 30

31 B E S T - IN- C L A S S C E L L U L A R A N D W I - F I S I G N A L I N G Keysight Cellular network emulation RF layer analysis Ixia Wi-Fi AP and station testing Application traffic generation Cellular WiFi UXM Multi-mode devices WaveTest System Test Automation Platform Emulate complex interoperability environments 31

32 W I T H A U T O M AT E D S TA N D A R D U S E C A S E S Emulates LTE network Emulates LTE network Emulates WiFi AP LTE Throughput DUT LTE Hotspot / CPE Throughput WiFi Load LTE WiFi DUT Emulates WiFi stations (clients) Multi-mode device #1: Hot Spot #2: Smart Phone 32

33 1. Application Software: Signal Generation: Signal Studio for WLAN-N7617B/C Signal Analysis: VSA software 2. Signal Generator: N5172B/ N5182B Vector Signal Generator 3. Signal Analyzers: N9020A/B, N9030A/B and N9040A 4. Combination Vector Signal Generator+ Analyzer: M9421A (VXT) E6640A (EXM) 5. System Performance Test Tools: Propsim (Channel Emulator) IxVeriWave (Cellular+ WiFi Signaling Test Solution) 33

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