Nokia's planned sale of its devices unit to Microsoft for $7.4 billion has met a new round of delays, this time in Asia.

The deal is delayed until April, awaiting approval from regulators in China. It already was approved by antitrust regulators in the United States and Europe, and was supposed to get final approvals elsewhere in March.

There was some speculation from Reuters that the company may have to make “technology patent concessions to get the deal done.”