Multi-chamber testbed for Wi-Fi/NR-U coexistence testing July 17, 2019 Leigh Chinitz, octoScope

Both Wi-Fi and NR-U likely to coexist in the 6 GHz band

Both Wi-Fi and NR-U likely to coexist in the 6 GHz band

Various coexistence scenarios will need to be explored Simple ones …and much more complex ones 1 root 2

Even simple scenarios will have many possible variations

Coexistence testing must be defined in the context of a testbed Many options are available Conducted testing Large anechoic chamber testing Radiated open air testing Multi-chamber testing The testbed must: Be able to create the test scenarios of interest (EXTENSIBLE) Be able to produce repeatable results (REPEATABLE) The testbed should: Be accessible to anyone who wants to use it (ACCESSIBLE) For some good work on wireless coexistence, we strongly recommend reading the ANSI C63.27, “American National Standard efor Evaluation of Wireless Coexistence” It defines “coexistence” as well as other relevant terms, and provides a framework for understanding the probability that two wireless networks can coexist.

WFA testbed for coexistence testing of LTE-U and Wi-Fi A full mesh, multi-chamber testbed See https://www.wi-fi.org/file/coexistence-test-plan

octoScope testbed for Wi-Fi Alliance coexistence testing Co-existence testbed, as implemented

Multi-chamber co-existence testbed Makes possible the “simple” configurations with one AP/STA and one gNB/UE pair Full control over “distances” allows for all combinations of that simple topology to be tested, easily Tests can easily look at more than one topology Changed via SW Shielded Enclosure PA_6 AP PA_4 UE PA_1 gNB PA_2 PA_5 STA PA_3 Programmable Attenuator

Even the complex scenarios can be supported 3-node mesh and STA 1 2 root gNB and UE

Multi-chamber testbed a solid choice for coexistence testing Extensible Accessible Repeatable

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Backup Testbed Examples

Personal testbed Traditional testbed AP testbed devices DUT sniffer STA testbed devices

Generic certification testbed Wireless Sniffer UCC = universal CAPI control CAPI = common application programming interface Sigma UCC … WFA EMT DUT RF combiner Sigma AP Control Agent Ethernet Switch Sigma PC End Point RADIUS Server Ethernet Switch Ethernet filters Control Ethernet Test Ethernet Ethernet Switch

Example testbed – ax TTG Testbed APs are cabled in the top chamber Testbed STAs are cabled in the bottom chamber DUT and sniffer are OTA coupled in the middle chamber High gain antennas (log periodic) offer full dynamic range when coupled from on chamber to another via a programmable attenuator AP testbed devices DUT sniffer STA testbed devices