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Unlicensed LTE/WiFi Coexistence Testbed

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Presentation on theme: "Unlicensed LTE/WiFi Coexistence Testbed"— Presentation transcript:

1 Unlicensed LTE/WiFi Coexistence Testbed
Month Year doc.: IEEE yy/xxxxr0 July 2015 Unlicensed LTE/WiFi Coexistence Testbed Date: Authors: Ben Lampert, octoScope John Doe, Some Company

2 Month Year doc.: IEEE yy/xxxxr0 July 2015 Abstract Propose an Unlicensed-LTE/Wi-Fi testbed for coexistence characterization. Ben Lampert, octoScope John Doe, Some Company

3 Common Testbed Motivation
July 2015 Common Testbed Motivation Everyone benefits from testing real devices and applications that would be difficult to recreate in a simulation Wi-Fi community will benefit from “hands on” experience with Unlicensed LTE to evaluate their applications and devices 3GPP will benefit by alleviating concerns about coexistence mechanisms and using data to inform LTE- LAA decisions A neutral test platform can provide fair sharing data for both Wi-Fi and Unlicensed LTE to help inform decisions from both groups Ben Lampert, octoScope

4 LTE-LAA Benefits from Participating in Testing
July 2015 LTE-LAA Benefits from Participating in Testing Testbed will allow for any early LTE-LAA development units to be tested (ie, rack mounted) Can use existing Wi-Fi/LTE-U devices to help drive LTE-LAA decisions based on real interactions. Best Coexistence Mechanisms Energy detection thresholds Real device traffic patterns and application behavior Channel selection algorithms Good LTE-U Coexistence data already taken [1], input from Wi-Fi community can only help inform decisions Ben Lampert, octoScope

5 Possible Test Scenarios
July 2015 Possible Test Scenarios Testbed to define and validate fairness Wi-Fi/LTE, Wi-Fi/Wi-Fi, LTE/LTE Fairness criteria including VoIP, Packet Jitter, Airtime, Throughput, etc Neutral Testbed for vendors (LTE/Wi-Fi) to test particular scenarios Hidden Nodes High Density Environments Operation in different CCA detection thresholds Application/vendor specific tests Adjacent/Co-Channel Interference Ben Lampert, octoScope

6 Intro to Unlicensed-LTE Testbed
Month Year doc.: IEEE yy/xxxxr0 July 2015 Intro to Unlicensed-LTE Testbed Goal was to design a RF environment that was flexible for testing variety of Unlicensed LTE/LTE-LAA/LTE-U/Wi-Fi scenarios. Based on our understanding the requirements for a wireless contention test bed are: High Isolation from external devices Good control over power levels across devices Multipath Environment to test MIMO STA’s Ability to test real applications (VoIP, Video streaming, file transfer, etc) Flexibility to test high channel load environments Repeatability and in a lab environment Focused on simple scenario: Wi-Fi AP-STA baseline with added Wi-Fi or LTE eNB traffic Ben Lampert, octoScope John Doe, Some Company

7 Coexistence Testbed with multipath
July 2015 Coexistence Testbed with multipath OTA Wi-Fi STAs Ethernet, HDMI, USB Ports AP Ethernet Wi-Fi sniffer Multi-Path Emulation LTE eNB / Wi-Fi AP Wi-Fi LTE 8 LTE UEs LTE monitor Attenuator Goals: -OTA (Over the air) Coexistence testing -Multi Path Emulation (Can be bypassed) -Wi-Fi traffic to clients benchmarked before and after LTE introduced -Wi-Fi sniffer helps diagnose channel loading/packet timing -Can be used to test real life applications (video streaming, VoIP, etc). -Attenuation helps tune power received on STA/UE. -Can test two 4x4 Wi-Fi AP’s or a 4x4 Wi-Fi AP with a 2x2 LTE device. Ben Lampert, octoScope

8 Coexistence Testbed w/o multipath
July 2015 Coexistence Testbed w/o multipath Goals: -Similar to multipath testbed -AP and eNB couple OTA in top box via antennas. OTA Wi-Fi STAs Ethernet, HDMI, USB Ports AP Ethernet Wi-Fi sniffer LTE eNB Wi-Fi LTE Attenuator 6-8 LTE UEs LTE monitor 4 2-4 Ben Lampert, octoScope

9 July 2015 Hidden Node Scenario One possible test scenario is characterizing how Unlicensed-LTE and Wi-Fi handle hidden nodes When group 1,3 cannot directly observe each other or observe below ED levels how will the detection mechanisms work? AP1/enB1 AP2/enB2 AP3/enB3 Clients2 Clients3 Clients1 Hidden Node problem: Groups 1,2 and 2,3 can observe each other. But groups 1,3 cannot (outside of the Rx sensitivity) Ben Lampert, octoScope

10 Multiple Nodes/Hidden Node Testbed
July 2015 Multiple Nodes/Hidden Node Testbed Client Box 1 Client Box 2 Client Box 3 Attenuator Attenuator Attenuator Wi-Fi/LTE Clients Wi-Fi/LTE Clients Wi-Fi/LTE Clients Wi-Fi Wi-Fi Wi-Fi LTE LTE LTE AP/eNB Box 1 AP/eNB Box 2 AP/eNB Box 3 Ben Lampert, octoScope

11 Hidden Node Configuration
July 2015 Hidden Node Configuration 5Ghz Path Loss Attenuator Client-Client 6 Attenuator AP-Client Cables 3 OTA Loss 40 Tx Power +24dBm Rx Threshold >-100dBm Est. Rx Power (dBm) C1 Rx C2 Rx C3 Rx AP1 Rx AP2 Rx AP3 Rx C1 Tx - -65 -111 -25 -71 -117 C2 Tx C3 Tx AP1 Tx -77 -123 AP2 Tx AP3 Tx Clients and AP/eNB in Box 2 see both C1/AP1 and C3/AP3 Devices in 1 and 3 cannot observed each other (outside of the Rx Sensitivity) Link between 1/3 can be added depending on scenario. Ben Lampert, octoScope

12 July 2015 Extra Slides Ben Lampert, octoScope

13 Rack Mount Testing Wi-Fi STAs LTE UEs 6 4 Wi-Fi 2 2 July 2015
Ideally would like to put in the chamber to maximize isolation, but this may not be an option. Rackmount RF shielding may also be poor, so may consider putting enB in it’s own box to reduce leakage. OTA Wi-Fi STAs Ethernet, HDMI, USB Ports AP Ethernet Wi-Fi sniffer Option 1: Rack inside chamber LTE eNB (Rack mounted) Wi-Fi Attenuator 6 LTE UEs LTE monitor 4 2 2 Option 2: Rack outside of chamber LTE eNB (Rack mounted) Ben Lampert, octoScope

14 Multiple Small Cell Testbed
July 2015 Multiple Small Cell Testbed LTE-U Indoor Simulation Scenarios (SI5-8) -Based on test scenarios provided by 3GPP (See 2) -Chaining chambers expands wireless loading/environment -Multiple AP’s, Small Cells operating co-channel 1 2 3 n 1 2 3 n Links between nodes control interactions Ben Lampert, octoScope

15 Possible Multiple Small Cell/Enterprise loading configuration
July 2015 Possible Multiple Small Cell/Enterprise loading configuration RF daisy-chain coupling to emulate space among AP/eNB pairs Ben Lampert, octoScope

16 Month Year doc.: IEEE yy/xxxxr0 July 2015 References [1] LTE-U Technology and Coexistence, LTE-U Forum May 28th, 2015 u_coexistence_mechansim_qualcomm_may_28_2015.p df [2] LTE-LAA 3GPP Document Ben Lampert, octoScope John Doe, Some Company

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