The fight over LTE networks sharing channels with Wi-Fi appears to be heating up.

The Wi-Fi Alliance says that by September there will be a way to test whether an LTE device can get along with Wi-Fi. But Qualcomm, one of the biggest backers of LTE-U (LTE-Unlicensed), is demanding those tests immediately.

The latest disagreement arose after a workshop held last Wednesday, the latest in a series aimed at crafting a test plan for coexistence between the two technologies. That test plan, which is designed for new products that use LTE in unlicensed bands, will be finished and verified by late September, WFA said.

That’s at least a month later than some earlier forecasts. Test development has taken a long time because it’s an unprecedented project and the tests still need to be validated, WFA marketing vice president Kevin Robinson said.

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