By Sven Grundberg 

STOCKHOLM--Slack demand for mobile data networks in Japan and North America and stiff competition from rivals led Swedish wireless networks giant Ericsson to report a sharp decline in revenue over the first three months of the year.

The company, doing battle with the likes of China's Huawei Technologies Co., ZTE Corp., France's Alcatel-Lucent and Nokia Corp.'s network arm, said Wednesday revenue declined 9% in the first quarter to 47.51 billion Swedish kronor ($7.21 billion). While Ericsson expects a boost in the second half of the year due to new business awards, declining revenue from two large mobile broadband coverage projects in North America hurt the most recent results.

Ericsson is one of the leading participants in an industry in transition. People around the world are increasingly browsing the web using wireless smartphones and tablets, heightening the need for faster and more capable networks. But manufacturing of base stations and antennas has become more commoditized, opening the door for lower-cost competitors from China that put pressure on an already-crowded field of telecom gear manufacturers.

As a result, the Swedish company is becoming more focused on delivering services that often have lower margins but require less capital. In addition, Ericsson is increasingly involved in programming software that telecom operators use to run and administer their networks, such as programs that help billing operators' subscribers.

Despite declining revenues, the company posted higher net profit during the period, mainly due to a more favorable business mix that boosted gross margins to 36.5% in the first quarter, from 32% a year ago. Ericsson sold a smaller share of low-margin network rollout projects and a larger share of higher margin software projects. "Some of our customers invested more in software to improve network performance and user experience," the company said.

Shares of Ericsson fell 4.6% Wednesday.

A key area of concern resides in North America, Ericsson's single largest market. Overall revenue in the region slipped 23% in the first quarter compared with the same period a year ago. Sales in Northeast Asia declined 19% on the year.

Those declines were partially offset by growth in China, the Middle East and Latin America.

Ericsson has been a beneficiary of investments into fourth-generation LTE networks--a technology standard that offers vastly higher mobile data speeds compared with older solutions. The technology has been widely adopted by mobile carriers in the U.S., Japan, South Korea.

While Ericsson's revenue miss in the first quarter was substantial, Lars Söderfjäll, an analyst at Ålandsbanken in Stockholm, said Wednesday's results may not be a proxy for the wider industry. "This business leans heavily on single projects and individual customers, so I'd be careful to read too much into Ericsson's earnings as far as its competitors are concerned," he said.

Huawei, for instance, has seen revenue and earnings climbing steadily in recent years despite operators' reluctance to increase spending on networking equipment. Last month, it forecast an 8% rise in revenue from its mainstay telecom-network-equipment business.

A key reason for optimism is that the deployment of 4G network technology still has plenty of frontiers to penetrate. Large parts of Western Europe, for instance, have lagged behind Japan and the U.S. in deploying ultrafast LTE networks.

Ericsson, however, said Western Europe remained roughly flat in the first quarter, compared with a year earlier even as operator investments in Europe are expected to pick up following the prolonged economic slump.

Ericsson's European performance is set for a boost as it has been awarded a five-year contract from Vodafone Group PLC as part of the mobile operator's effort to beef up its networks. Ericsson didn't disclose the size of contract, but said it involves upgrading and expanding Vodafone's older 2G and 3G networks, as well as participating in the build-out of its fourth generation network in Europe.

Ericsson's net profit came in at 2.12 billion kronor, up from 1.21 billion kronor a year ago, when profits were weighed by restructuring costs. Operating income increased 25% on the year to 2.63 billion kronor.

Write to Sven Grundberg at sven.grundberg@wsj.com

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