The United States added Huawei Technologies, the world's biggest telecoms equipment maker, to a trade blacklist in May, prompting global tech giants to cut ties with the Chinese company and putting pressure on European countries to follow suit.
Washington alleges Huawei's equipment can be used by Beijing for spying, something the company has repeatedly denied.
The move by US President Donald Trump's administration comes as telecoms operators worldwide are gearing up for the arrival of the next generation of mobile technology, or 5G, which promises ultra-fast mobile internet for those able to make the heavy investment needed in networks and equipment.
The estimate is part of a report by telecoms lobby group GSMA, which represents the interests of 750 mobile operators.
GSMA has already voiced concern about the consequences of a full ban on Huawei, whose products are widely purchased and used by operators in Europe.
The 55-billion-euro estimate reflects the total additional costs implied by a full ban on purchases from Huawei and Chinese peer ZTE for the roll out of 5G networks in Europe.
"Half of this (additional cost) would be due to European operators being impacted by higher input costs following significant loss of competition in the mobile equipment market," the report said.
"Additionally, operators would need to replace existing infrastructure before implementing 5G upgrades."
The two Chinese vendors have a combined market share in the European Union of more than 40%.
According to the report, a ban would also delay the deployment by 18 months of the technology, which will be used in areas ranging from self-driving cars to health and logistics.
"Such a delay would widen the gap in 5G penetration between the EU and the US by more than 15 percentage points by 2025," according to the report.
This delay would result from delivery challenges for other major equipment makers, such as Ericsson, Nokia and Samsung, in the event of a sudden surge in demand.
It would also follow from the need for telecoms operators to transition from one set of equipment to another.
COMMENTS
Comments are moderated and generally will be posted if they are on-topic and not abusive.
For more information, please see our Comments FAQ