Deutsche Telekom completes stratospheric 4G network test
The world’s first 4G voice and data connectivity platform has been successfully tested miles above the surface of the Earth.
The German communications giant, , has partnered with to perform the test in a remote-controlled aircraft, which saw the first working demonstration of a platform fully integrated into a commercial mobile network on the edge of the stratosphere.
Currently, SPL, along with several partners, is developing a hydrogen-powered, remote-controlled aircraft. They are also working on a communications payload and connected ground-based infrastructure which will be suitable for commercial use, with the first flights scheduled for mid-2022.
According to Deutsche Telekom, a number of test flights have already taken place in the German region of Bavaria. Flying at an altitude of 14km, the remote system relies on installed antennas to set up data and voice connectivity.
The connection, which was joined to Deutsche Telekom’s terrestrial mobile network, was stable enough to run video calls, web browsing, data downloads and voice over LTE calls.
The test produced download speeds of 70Mbps and upload speeds of 20Mbps in the 2.1 GHz range over a 10 MHz bandwidth. It was successful because the high-altitude flight provides an uninterrupted ground view. The plane is fitted with antennae that enhance the company’s ground-based mobile phone network by feeding radio cells with a 100km diameter.
The research now offers a potential solution to “white spot” areas, which are usually geographical high points where mobile signals are unavailable.
The move from ground-based cellular masts to an airborne antenna solution would not be a difficult transition for consumers, according to , member of the SPL Board on behalf of Deutsche Telekom and Managing Director of Deutsche Telekom's subsidiary Deutsche Funkturm.
He told : “We have shown that we can bring fast Internet and connectivity anywhere in the future. The combined know-how of SPL and Telekom's mobile communications expertise is the basis for this new technology.”
Jacobfeuerborn added, "Particularly in areas that are difficult to access with traditional mobile masts, flying base stations will be a useful and cost-efficient addition to our mobile communications network.”
Indigo: overcoming the challenges of fibre rollouts
Investment houses are actively demonstrating their confidence in fibre. Governments are committing to urban and rural rollouts as part of the EU’s European Gigabit Society objectives on connectivity. You could be forgiven for the thinking that we are in the middle of a simple transition to super-fast networks with capacity to spare.
But it is not always that easy. The integral value of ubiquitous ‘full fibre’ access has had some very positive socioeconomic benefits across a great number of countries since COVID broke and lockdowns began, not only for those working remotely but for those living in and enjoying rural life and being able to remain living there because they are now having connectivity.
The direct appeal to investors is obvious – fibre is expensive to deploy but once in the ground the value quickly rises. Essentially it’s glass, which means it costs less to maintain than copper, ticks increasingly important ESG (Environmental, Social, and Governance) criteria, and promises a huge payback over an extended period of time. You could even call it future proof. Full fibre access as a strategic infrastructure investment and utility is forming and even strengthening public policy across Europe.
But there are a couple of challenges that need to be factored in. Investors and independent alternative network (AltNet) operators need to be aware of two things:
1. A skills deficit when it comes to deploying fibre.
2. Its nuanced relationship with 5G, another network technology that’s getting people very excited.
Growing a talent pipeline
Appointing people with the expertise to design and build fibre networks can be more difficult than you might think. AltNet operators might be shocked to discover that higher education institutions are behind the curve, that the engineering talent pipeline is not there. Unlike other engineering disciplines, such as structural, mechanical or electrical, you can’t actually complete a degree course in fibre engineering in the UK or Ireland – which is surprising when you consider the amount of investment it’s attracting.
We recognised that the lack of fibre design and build courses created a need that we had to address. When it became clear that the talent pool was near empty, we set about creating our own. In the last three years, we have put enormous resources into the development of in-house training. We expected and planned for a busy time as fibre rollout began and we were pleasantly surprised at how much work and how quickly it would come out.
Wireless and fibre considerations
The next iteration of mobile networks presents more than a skills challenge and AltNet operators need to understand the role 5G will play in meeting the bandwidth needs of consumers and businesses. The first thing to be clear about is that wireless and fibre are not in competition, they are complementary.
We design networks for both wireless/5G and fibre and take the fact they complement each other for granted. But for the wider world it seems that an education job still needs to be done.
Where one wins over the other as the primary means of access should always depend on the business case and backhaul considerations. Finance houses and AltNet providers need to make themselves familiar with both technologies or risk a rollout based on a bad business case. You have to weigh up performance versus cost and capacity requirements and the part that design and engineering play in the network build. Investors are clambering across each other to obtain fibre assets across Europe. Most are infrastructure and pension funds given the non- precarious nature of these investments and their proven ROI.
There are pros and cons for each: customers get a level of comfort from fibre in a way that they don’t with wireless because it’s a tangible piece of technology that offers more network throughput. The downside is that it might also involve invasive digging and reinstatement works as well as complicated planning and council permissions. All of this ramps up the cost.
The long-term value of putting fibre in the ground might be lost if a mobile operator reaches the same rural destination with 5G for a fraction of the investment. Wireless technologies can be deployed much faster and next-generation mobile networks will be able to carry much larger data packets than they did in the past. So if the challenge is to deliver broadband to a rural village, a 5G or microwave deployment is likely to be easier and more cost-effective than fibre to the home.
AltNet companies building businesses around fibre need to be aware that achieving a return on investment involves more that securing a contract with a local authority. Skills shortage and the role of 5G have to be factored into the plans. Then there is the challenge of turning a fibre network design into a well-executed build that comes in on budget. But that’s another story…