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Nokia's CEO told CNBC Wednesday that he was confident a 15.6 billion-euro ($16.5 billion) takeover deal of smaller French rival Alcatel-Lucent will get the thumbs up from regulators.

"We expect closure of the deal to happen in the first half of 2016. There are a number of jurisdictions to get antitrust approvals from," Rajeev Suri, the CEO of Nokia, said.

Read MoreNokia confirms it will buy Alcatel-Lucent

"I am confident we will get through that process successfully because a lot of the customers, I believe, will support this deal because it makes a lot of sense to them as well."

Finland's Nokia plans to buy Alcatel-Lucent in an all-stock deal that will build up its telecom equipment business to compete with Sweden's Ericsson, which leads the market.

Regulatory approval is one hurdle the two companies will face. Others, analysts said, include an integration process that could take years.

Alcatel-Lucent's CEO Michel Combes (L) and Nokia's Chief Executive Rajeev Suri
Thomas Samson | AFP | Getty Images

Nokia will pay 0.55 shares for every share of Alcatel-Lucent, offering shareholders a premium of around 28 percent to the weighted average share price over the past three months.

Alcatel-Lucent shareholders will end up with 33.5 percent of the combined company, which will be headquartered in Finland, while Nokia's shareholders will get the remainder. The combined firm will operate under the Nokia brand.

Suri said the deal was a "very good complementary fit on both portfolios and geography."

He added: "We get stronger wireless in the U.S. and China, and the portfolio fit is such that we are number one or number two in every key business line we will operate in."

Alcatel-Lucent shares fell 11 percent on Wednesday, following news of the deal. Shares in Nokia rose 2 percent.