When big commercial issues emerge, and industry segments see danger to their revenue models, all sorts of otherwise arcane issues, ranging from standards to testing protocols, can become contentious.
So it is with a proposed testing format supported by the Wi-Fi Alliance. Intended to measure potential interference from Long Term Evolution-Unlicensed (LTE-U), Supporters of LTE-U say the test is unfair, as it proposes power limitations more severe than used by Wi-Fi devices.
The main issue is Wi-Fi “received signal strength” (RSSI) levels. The Wi-Fi Alliance wants a -82 dBm signal level, but Verizon and Qualcomm, among others, believe the value should be -72 dBm.
Wi-Fi, Bluetooth and ZigBee are designed to avoid seeking access at levels of -62 dBm. Rival protocol LAA has already uses a level of -72 dBm for testing.
Wi-Fi interests say the test levels should be set as low as -89 dBm.
“The latest version of the test plan released by the Wi-Fi Alliance lacks technical merit, is fundamentally biased against LTE-U, and rejects virtually all the input that Qualcomm provided for the last year,” Dean Brenner, Qualcomm’s SVP of government affairs. “The latest version of the plan would require LTE-U to protect Wi-Fi 100 times more than Wi-Fi would protect LTE-U in all environments under criteria that ignore data submitted to the Wi-Fi Alliance, including data from Wi-Fi vendors.”
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