Wifi, mesh network, maybe a new protocol. It makes no sense for them to jump into a secret experiment for anything to do with LTE. They get an experimental license from the FCC so they can tweak ota protocols and power outputs, they use modified nexus phones, and they send their people out wandering about the campus making regular old phone calls without using an incumbents network.
When it matures, they deploy it in all their fiber neighborhoods customer equipment and all that excessive bandwidth a few people here complain about gets used for covering areas with a free wireless service for certain models of cell phones.
LTE is an incumbents wet dream because it's a paid pipe, google doesn't need that but investors like to make it seem like they do.
Think of it this way, who has kept you from having regular old voip apps on your smartphone? The incumbents, who hate wifi, hate free, hate knowledgeable customers. This is stupidly simple technology that has existed for decades.
Say no to astroturfing. actions > Ignore Author