PARIS-- Nokia Corp. has sealed an agreement to buy rival telecommunications-equipment firm Alcatel-Lucent in an all-stock deal that values the French company at EUR15.6 billion ($16.6 billion), the companies said Wednesday.

The deal caps months of negotiations between the two firms, backed by the French government, and years of speculation that Europe's two smaller network-gear makers would eventually need to team up to have enough resources to compete globally against larger rivals including Sweden's Ericsson and China's Huawei Technologies.

Under the agreement, which was approved by both companies' boards, Nokia will issue 0.55 shares of stock for every outstanding Alcatel-Lucent share, giving Alcatel-Lucent shareholders 33.5% of the merged company when the transaction is complete. The companies say they expect to close the deal in the first half of 2016.

After completion, Nokia will remain based in Finland under existing Chairman Risto Siilasmaa and Chief Executive Rajeev Suri, the firms said in a statement. The company said it will maintain strong research facilities in France and nominate a vice chairman from Alcatel-Lucent.

The deal brings together two industrial icons of their respective countries, each of which had in recent years been laid low by corporate missteps and intense competition. After the sale of its struggling handset division to Microsoft Corp. in 2013, this deal will help seal Nokia's pivot to a global provider of network technology, giving it access to lucrative Alcatel-Lucent client relationships in the U.S. and a suite of Internet-routing technologies to complement its wireless gear.

"We will have a strong presence in every part of the world, including leading positions in the United States and China," Mr. Suri said in a statement.

Write to Sam Schechner at sam.schechner@wsj.com

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