By Hyunjoo Jin

SEOUL (Reuters) - Samsung Electronics Co Ltd <005930.KS> on Monday named its youngest president as its new smartphone chief as the firm seeks to defend its lead in the handset market from rising challenges from rivals such as Huawei Technologies Co Ltd [HWT.UL].

The South Korean firm also promoted the head of its network equipment business, which analysts said got a lift from a U.S. campaign to convince allies to bar Huawei from their networks.

Samsung took an early lead in smartphones running on quicker fifth-generation (5G) telecommunication networks, but Huawei is widely expected to boost sales of 5G-capable smartphones and equipment this year, leveraging its huge home market.

"Samsung's reshuffle seems aimed at coping with a potential major market change with the new technology," said analyst Tom Kang at Counterpoint. "The young executive is known to be decisive and so is likely to respond swiftly to that change to defend Samsung's lead from Huawei."

Long-time smartphone leader Samsung held a 21% market share in the third quarter, but Huawei closed in with 18%, showed the latest data from Counterpoint. That came even as Huawei in May was banned from doing business with most U.S. firms, preventing its access to technology like Alphabet Inc's <GOOGL.O> Android.

NETWORK CHIEF

Samsung appointed Roh Tae-moon, currently its youngest-ever president at 51, as mobile chief as part of a reshuffle that came later than usual amid a series of court cases involving some of its top executives including leader Jay. Y Lee.

Roh championed Samsung's shift to outsource more handset production to cut costs and better compete with lower-priced Chinese smartphone makers such as Huawei, people familiar with the matter previously told Reuters.

As former mobile development head, Roh led development of Samsung's Galaxy mobile devices, and is tasked with re-invigorating the organisation at a time of heated smartphone competition, the South Korean company said in a statement.

Samsung's network business chief Cheun Kyung-whoon, who was involved in the world's first commercialisation of 5G services in South Korea, was promoted to president to help turn networking into a major business for the firm, Samsung said.

Samsung, a laggard in the telecom network equipment market, has been pouring resources into the business, aiming to capitalise on the security fears hobbling market leader Huawei.

Huawei has been bogged down denying allegations by the United States that the Chinese state could use its equipment for spying and so should not be used in 5G networks.