Yankee Group Research Inc., the Boston mobile strategy firm, has been acquired by a New York technology research company, 451 Group LLC , the companies said Thursday. Terms of the deal with Yankee Group’s prior owner, Boston private equity firm Alta Communications, were not disclosed.

Yankee Group, Boston’s oldest technology forecasting firm, analyzes mobile communications trends and advises business about how to capitalize on them.

“Mobility is a huge driver of innovation in business and technology markets globally,” said 451 Group’s chief executive, Martin V. McCarthy. “With Yankee Group, we see an exciting opportunity to significantly extend the 451 Group’s focus on the evolution of digital infrastructure.”

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Yankee Group will operate as an independent division of 451 Group, which has a Boston office, with Yankee’s chief executive, Terry Waters, continuing in that role.

“We are very excited to be joining the 451 Group family and look forward to continuing to provide actionable research and trusted advice to our clients around the world,” Waters said.

Yankee Group becomes 451 Group’s third division. One division, 451 Research, advises businesses about information technology trends, such as cloud computing and Internet infrastructure.

A second division, the Uptime Institute, focuses on the global data center and emerging digital infrastructure industry.