Huawei rotating chairman Guo Ping said during a keynote at MWC in Barcelona on Tuesday that the US accusation about security in its 5G equipment "has no evidence, nothing".
"The irony is that the US CLOUD (Clarifying Lawful Overseas Use of Data) Act allows their governmental entities to access data across borders," he added.
Washington has been campaigning to try and get other countries not to use Huawei equipment in their 5G rollouts, claiming that the firm is obliged to spy for China if Beijing asks it to.
The DoJ said it needed the data to pursue action in a case involving drug trafficking.
The Act changed US law so that law-enforcement warrants would henceforth apply to data stored anywhere by US-based tech firms
The legislation was tagged onto a massive spending bill which was signed into law by US President Donald Trump.
The new Act means that the one feature sought by foreign companies — not to have their data at the beck and call of the American Government — would no longer be an option if they chose to use the cloud services of a US firm operating in their own countries.
On the downside, the Act also gives companies the right to challenge warrants in court based on privacy laws in the specific country where the data is stored.
Guo dwelt in detail on what he claimed was Huawei's superior 5G technology. "Huawei is the first company that can deploy 5G networks at scale. More importantly, we can deliver the simplest possible sites with better performance," he told his audience.
"With 100 megahertz, our 5G can reach more than 14Gbps; that’s for a single sector. We are at the leading edge of performance.
"Strong capacity also needs strong transmission equipment. If fibre is available, we only need to install a blade, attach one fibre, and we can bring bandwidth up to 200Gbps. It's incredible.
"If fibre is not available, carriers can use microwave. However, the bandwidth of traditional microwave is only 1Gbps. To address this problem, we use innovative architecture to boost that bandwidth to 20Gbps.
"With our 5G smartphone and CPE, Huawei is able to provide end-to-end 5G solutions. We have begun to help carriers deploy 5G at scale."
Regarding capacity, Guo said using a performance algorithm, Huawei could more than triple cell throughput.
"For hardware, our 5G chips support 64 channels, the highest in the industry. We have also increased the computing power of these chips by 2.5 times," he added. "For microwave, we can support 10 times greater transmission bandwidth than other solutions on the market. Little by little, we are pushing the physical limits of our technology."
He said another thing the company was doing was simplifying sites as much as possible without sacrificing performance.
"For example, if we made 64T antennas with old techniques, one 5G antenna would be bigger than a door," he said. "Can you imagine installing that? If we put one here on the beach (in Barcelona), it would be blown down.
"To address this issue, we are using new materials. We have reduced the number of components by 99%, and with lighter covers, we can reduce weight by 40%.
"These new AAUs (active antenna units) are as wide as a backpack and very strong. They can survive grade-15 typhoons. This happened in Shenzhen last year.
"Installation is super easy. We can install them directly on a 4G site, or even on a lamp pole. Simple sites greatly reduce carrier CAPEX and OPEX. In Europe, where space is limited, we can help you save 10,000 on site rental, every site, every year."