MU MIMO Overview And Setup 80 Y8113 11 Guide
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Scope: QCA61x4A, QCA65x4, QCA937x, WCN3680, WCN39xx MU-MIMO Overview and Test Setup Qualcomm Technologies, Inc. 80-Y8113-11 Rev. G Confidential and Proprietary – Qualcomm Technologies, Inc. NO PUBLIC DISCLOSURE PERMITTED: Please report postings of this document on public servers or websites to: DocCtrlAgent@qualcomm.com. Restricted Distribution: Not to be distributed to anyone who is not an employee of either Qualcomm Technologies, Inc. or its affiliated companies without the express approval of Qualcomm Configuration Management. Confidential and Proprietary – Qualcomm Technologies, Inc. NO PUBLIC DISCLOSURE PERMITTED: Please report postings of this document on public servers or websites to: DocCtrlAgent@qualcomm.com. Restricted Distribution: Not to be distributed to anyone who is not an employee of either Qualcomm Technologies, Inc. or its affiliated companies without the express approval of Qualcomm Configuration Management. Not to be used, copied, reproduced, or modified in whole or in part, nor its contents revealed in any manner to others without the express written permission of Qualcomm Technologies, Inc. Qualcomm is a trademark of Qualcomm Incorporated, registered in the United States and other countries. Other product and brand names may be trademarks or registered trademarks of their respective owners. This technical data may be subject to U.S. and international export, re-export, or transfer (“export”) laws. Diversion contrary to U.S. and international law is strictly prohibited. Qualcomm Technologies, Inc. 5775 Morehouse Drive San Diego, CA 92121 U.S.A. © 2014-2017 Qualcomm Technologies, Inc. and/or its affiliated companies. All rights reserved. Confidential and Proprietary – Qualcomm Technologies, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y8113-11 Rev. G 2 Revision History Revision Date Description A October 2014 B April 2015 C August 2015 D September 2015 Changed document title and added scope. Added section title for test setup and modified slide set. E November 2015 Deleted slide 13, MU-MIMO configuration. Added slide for “MU-MIMO capability on association request (client side)”. On “MU gain in controlled environment” (slide 20), deleted MU-MIMO disabled/enabled columns in table. F August 2016 G February 2017 Initial release Updated document title. No change to content Updated slides 13,14,18 and 19 Added WCN39xx in scope Modified tables on slides 17 and 18 Confidential and Proprietary – Qualcomm Technologies, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y8113-11 Rev. G 3 Agenda MU-MIMO Overview 5 MU-MIMO overview for WCN39xx 6 Beamforming overview 7 Benefits of MU-MIMO (vs. single-user) 8 802.11ac IEEE vs. current vs. Release 2 features 9 MU-MIMO high-level architecture 10 MU-MIMO high-level design 11 Feature interaction 12 Test Setup 13 Test topology 14 Test procedure 15 MU-MIMO capability on beacon (AP side) 16 MU-MIMO capability on association request (client side) 17 iPerf commands used for WCN3680 throughput tests 18 iPerf commands used only for QCA61x4A/QCA65x4/QCA937x throughput tests 19 IxChariot setup 20 MU gain in controlled environment 21 Confidential and Proprietary – Qualcomm Technologies, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y8113-11 Rev. G 4 MU-MIMO Overview Section 1 Confidential and Proprietary – Qualcomm Technologies, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y8113-11 Rev. G 5 MU-MIMO overview • Multiple-input and Multiple-output (MIMO): A system that uses multiple antennas at both the transmitter and receiver to improve communication performance • SU-MIMO: Process of transmitting one or more streams to one user at-a-time • MU-MIMO: Process of transmitting one or more streams to more than one user at-a-time in the same set of frequency Confidential and Proprietary – Qualcomm Technologies, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y8113-11 Rev. G 6 Beamforming overview Explicit Beamforming measure Multi-User Beamforming (for MU-MIMO) Legacy/Implicit Beamforming measure measure measure UL AP AP • STA estimates channel and informs AP • AP performs TxBF Signal • All STAs in the group estimate channels and inform AP • AP performs Resource Allocation (Grouping, Rate Control) and TxBF DLMulti-User MIMO Single-User TxBF DL TxBF AP AP • AP estimates channel • AP performs TxBF Single-User TxBF measure Null Null Signal DL TxBF Signal AP AP MU-MIMO for three STAs in group AP • Requires beamforming in client • Optimized TxBF to 802.11ac client • Potential improved mid-range performance for 802.11ac clients • Does not require 802.11ac beamforming • Potential improved mid-range performance for legacy and 802.11ac clients • Requires high-precision beamforming • Interference between clients limits grouping • Requires complex resource allocation Confidential and Proprietary – Qualcomm Technologies, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y8113-11 Rev. G 7 Benefits of MU-MIMO (vs. single-user) • Supports multiple clients at the same time that improves overall DL throughput per client • With 2 to 3 times greater efficiency for MU clients, the network has more time or capacity to serve other clients. This is required for enterprise network Confidential and Proprietary – Qualcomm Technologies, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y8113-11 Rev. G 8 802.11ac IEEE vs. current vs. Release 2 features IEEE 802.11ac Features 802.11ac Release 1 Mandatory: 80 MHz 1ss client/mobile AP 2ss AP Optional: 160 MHz, TxBF, MU-MIMO STBC, LDPC Mandatory: 80 MHz 1ss client/mobile AP 2ss AP Optional: 3ss TxBF STBC, LDPC 802.11ac Release 2 Launch: June 2013 Mandatory: Short GI Optional: 4ss MU-MIMO 160 MHz Confidential and Proprietary – Qualcomm Technologies, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y8113-11 Rev. G 9 MU-MIMO high-level architecture Confidential and Proprietary – Qualcomm Technologies, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y8113-11 Rev. G 10 MU-MIMO high-level design Confidential and Proprietary – Qualcomm Technologies, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y8113-11 Rev. G 11 Feature interaction S. No. Feature interacting Behavior 1 P2P MU-MIMO is not supported in GO mode. The support exists in CLI mode if GO supports it. 2 Wi-Fi and BT co-existence Bluetooth (BT) does not know if AP is using DL-MIMO. Therefore, there is no change in the behavior. 3 SAP mode MU-MIMO is not supported in SAP mode because the device has a single antenna. • Note: From MAC software perspective, there should not be much impact on the existing features. The MU-MIMO feature receives MU streams by decoding GID and user position from the PLCP header, which is performed by PHY/MAC hardware. Confidential and Proprietary – Qualcomm Technologies, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y8113-11 Rev. G 12 Test Setup Section 2 Confidential and Proprietary – Qualcomm Technologies, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y8113-11 Rev. G 13 Test topology STA 1 MU-MIMO AP STA 2 Gigabit Ethernet Control PC STA 3 • Use a MU-MIMO AP (for example, Linksys EA8500) with the latest image Note: Use the latest image on AP. • A control PC for the AP supports Gigabit Ethernet, either iperf or licensed IxChariot • All STAs (support either 1x1 or 2x2) have iperf or IxChariot endpoint environment Note: Download the iPerf or IxChariot application from Playstore • Maintain 1 or 3 m away from AP to all STAs, and 1 m away between STAs • AP and STAs are placed in isolated chambers or an open environment Confidential and Proprietary – Qualcomm Technologies, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y8113-11 Rev. G 14 Test procedure 1. Enable AP with 5 GHz, 80 MHz, and WPA2 (open) security. 2. Make sure MU-MIMO is enabled on AP and STAs by default. 3. Associate STAs with AP. 4. Run UDP DL and TCP DL peak TPUT between AP to STAs, simultaneously, on all STAs. 5. Capture the throughputs on the STAs (Rx). 6. Aggregate the throughput observed on all the STAs. 7. Compare the results with MU-MIMO disabled. • Disable MU-MIMO mode from AP (or STA). • MU-MIMO gain = (MU-MIMO-enabled throughput)/(MU-MIMO disabled throughput). Confidential and Proprietary – Qualcomm Technologies, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y8113-11 Rev. G 15 MU-MIMO capability on beacon (AP side) Confidential and Proprietary – Qualcomm Technologies, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y8113-11 Rev. G 16 MU-MIMO capability on association request (client side) Confidential and Proprietary – Qualcomm Technologies, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y8113-11 Rev. G 17 iPerf commands used for WCN3680 throughput tests Clients Mode VHT80 Spatial stream 1SS + 1SS 1SS + 1SS + 1SS VHT40 1SS + 1SS 1SS + 1SS + 1SS VHT20 1SS + 1SS 1SS + 1SS + 1SS Protocol iPerf commands (server) for AP iPerf commands (client) for STA UDP iperf –c-u –i 1 –f m –w 2M –t 300 –b 350M iperf –s -u –i 1 –f m –w 2M TCP iperf –c –i 1 –f m –w 2M –t 300 –P 5 iperf –s –i 1 –f m –w 2M UDP iperf –c -u –i 1 –f m –w 2M –t 300 –b 320M iperf –s -u –i 1 –f m –w 2M TCP iperf –c –i 1 –f m –w 2M –t 300 –P 5 iperf –s –i 1 –f m –w 2M UDP iperf –c -u –i 1 –f m –w 512k –t 300 –b 200M iperf –s -u –i 1 –f m –w 2M TCP iperf –c –i 1 –f m –w 512k –t 300 –P 5 iperf –s –i 1 –f m –w 2M UDP iperf –c -u –i 1 –f m –w 512k –t 300 –b 200M iperf –s -u –i 1 –f m –w 2M TCP iperf –c –i 1 –f m –w 512k –t 300 –P 5 iperf –s –i 1 –f m –w 2M UDP iperf –c -u –i 1 –f m –w 512k –t 300 –b 70M iperf –s -u –i 1 –f m –w 2M TCP iperf –c –i 1 –f m –w 512k –t 300 –P 5 iperf –s –i 1 –f m –w 2M UDP iperf –c -u –i 1 –f m –w 512k –t 300 –b 70M iperf –s -u –i 1 –f m –w 2M TCP iperf –c –i 1 –f m –w 512k –t 300 –P 5 iperf –s –i 1 –f m –w 2M Confidential and Proprietary – Qualcomm Technologies, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y8113-11 Rev. G 18 iPerf commands used only for QCA61x4A/QCA65x4/QCA937x throughput tests Mode Clients Spatial stream VHT80 2SS + 2SS 2SS + 2SS + 2SS VHT40 2SS + 2SS 2SS + 2SS + 2SS VHT20 2SS + 2SS 2SS + 2SS + 2SS Protocol iPerf commands (server) for AP iPerf commands (client) for STA UDP iperf –c -u –i 1 –f m –w 2M –t 300 –b 350M iperf –s -u –i 1 –f m –w 3M TCP iperf –c –i 1 –f m –w 2M –t 300 –P 5 iperf –s –i 1 –f m –w 3M UDP iperf –c -u –i 1 –f m –w 2M –t 300 –b 320M iperf –s -u –i 1 –f m –w 3M TCP iperf –c –i 1 –f m –w 2M –t 300 –P 5 iperf –s –i 1 –f m –w 3M UDP iperf –c -u –i 1 –f m –w 512k –t 300 –b 200M iperf –s -u –i 1 –f m –w 3M TCP iperf –c –i 1 –f m –w 512k –t 300 –P 5 iperf –s –i 1 –f m –w 3M UDP iperf –c -u –i 1 –f m –w 512k –t 300 –b 200M iperf –s -u –i 1 –f m –w 3M TCP iperf –c –i 1 –f m –w 512k –t 300 –P 5 iperf –s –i 1 –f m –w 3M UDP iperf –c -u –i 1 –f m –w 512k –t 300 –b 70M iperf –s -u –i 1 –f m –w 3M TCP iperf –c –i 1 –f m –w 512k –t 300 –P 5 iperf –s –i 1 –f m –w 3M UDP iperf –c -u –i 1 –f m –w 512k –t 300 –b 70M iperf –s -u –i 1 –f m –w 3M TCP iperf –c –i 1 –f m –w 512k –t 300 –P 5 iperf –s –i 1 –f m –w 3M Confidential and Proprietary – Qualcomm Technologies, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y8113-11 Rev. G 19 IxChariot setup 1. Install the latest licensed IxChariot and UDP Rx only due to Chariot scripts issue on TCP. 2. Make 10 pairs per STA, approximately. Confidential and Proprietary – Qualcomm Technologies, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y8113-11 Rev. G 20 MU gain in controlled environment • 70 to 80% of lower performance is expected in an open environment while using different AP Mode VHT80 Scenarios 1SS + 1SS 1SS + 1SS + 1SS 2SS + 1SS 2SS + 2SS 2SS + 2SS + 2SS Protocol MU-MIMO gain UDP 1.74 TCP 1.72 UDP 2.43 TCP 2.32 UDP 1.71 TCP 1.70 UDP 1.29 TCP 1.23 UDP 1.21 TCP 1.14 Confidential and Proprietary – Qualcomm Technologies, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y8113-11 Rev. G 21 Thank You Confidential and Proprietary – Qualcomm Technologies, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y8113-11 Rev. G 22
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