What are 5G and mmWave, and when will you be able to realistically use them?
Carriers in the United States are rolling out 5G mobile networks, which promises to revolutionize mobile communications for everyone. With the hype it is generating, and the discussions surrounding how Apple will adopt the technology, it's worth taking a moment to work out what exactly 5G is, as well as what to realistically expect in the coming years.
What's been promised
According to the carriers and analysts alike, 5G will provide as much if not more of a seismic shift in connectivity as compared to when 4G LTE rolled out to the masses a few years ago. Just as the shift from 2G communications to 3G provided a speed boost, as did going from 3G to 4G LTE, the move to 5G will in theory provide many people with more speed, and more of an opportunity to use services that would not typically be used on current-generation networks.
With the promise of gigabit speeds, far exceeding that of 4G LTE, 5G offers the possibility for home broadband services to be provided over cellular networks, bringing the higher-speed services to areas that are too cost prohibitive for laying cable. The higher bandwidth on offer can also enable a greater use of IPTV or streaming video services, both to the home and to mobile devices.
The infrastructure could also be used to provide device-to-device communications, such as that of Internet of Things hardware, smart home systems, and even for self-driving cars to more effectively communicate with adjacent vehicles, and cloud servers for navigational assistance.
As networks are in the process of slowly rolling out their 5G networks, it's going to be a few years before the technology becomes commonplace, a fact confirmed by the carriers. Even with blanket coverage, which should be more resilient in general than other established communications technologies, some users just won't be able to experience 5G at its optimum speeds.
To see why, you have to look at 5G, the technologies behind it, and the mish-mash of companies rolling it out in more detail.
Referring to the "Fifth Generation" technology, 5G effectively refers to any communications network that uses "5G NR" technology. This is developed by the 3GPP, a standards organization that creates the protocols used for mobile communications, with 3GPP's standards used across multiple carriers around the world in order for devices to work between networks with minimal issues.
LTE Release-15, 3GPP's first-phase release of 5G's specifications, is frozen and scheduled to be completed sometime in 2019, while a second-phase Release-16 will complete at some point in 2020. The releases are effectively end points for development of functionality in each release, giving a definitive point where it is safe for hardware vendors to incorporate functions into infrastructure to be used by carriers, and devices for consumers.
In theory, each frozen release will refine the associated 5G standards, bringing those incorporating them into their networks closer to what a 5G network is supposed to be.
Technically, 5G as a whole will rely on 4G as a crutch for its initial implementations, in order for devices to make a connection to the network before being bumped up to the newer technology, despite 5G NR not being compatible with 4G networks directly. These non-standalone mode (NSA) networks will eventually give way to standalone (SA) mode networks eventually, in areas with fully deployed 5G transmitters, once the technology matures.
A Wide Array of Radio Bands
In order for 5G networks to function, they need to be assigned bits of the radio spectrum in order to function. This is determined in the United States by the Federal Communications Commission, in a series of spectrum auctions where carriers bid for licenses dictating what frequencies (channels) they can use to communicate with consumer devices. This process is mostly over.
Some of these bands have been freed up by the FCC in various ways over the years, such as in the 2008 wireless spectrum auction for 700MHz spectrum, which was previous used for analog television broadcasting until the FCC determined it was spectrally inefficient. Carriers can also free up bands it already owns and uses for other purposes, repurposing them for 5G communications.
As 5G networks use OFDM bonding to enable multiple channels to be bonded together, with channels being both bigger than 4G and able to be grouped together in larger clusters, this enables 5G networks to offer generally larger swathes of bandwidth than possible under 4G.
For 5G specifically, frequencies can be generally categorized into one of two groups — low-frequency sub-6GHz bands, and higher-frequency 6GHz bands. The first low range consists of bands that are currently used for existing mobile network communications, as low as 600MHz and up to 2,600MHz, though it can also include "C-Bands" up to 4,700MHz.
The second range, above 6GHz, is far higher in frequency than current systems operate, with four bands operating at between 24GHz and 39GHz.
Each of the two band ranges offer their own benefits and limitations to carriers, meaning the two can be used in quite different ways, each with its own engineering challenges for roll-out.
Slow and Durable Low-Frequency Bands
The low band range offers what could be considered more traditional use cases for mobile networks, evident by many of the bands being in the same frequency areas as those used for 4G and other communication types. Its low frequency means it is capable of traveling quite far distances to and from masts and isn't blocked by much, making it ideal for covering an entire country.
While resilient, making them great for placing fewer masts to blanket an area than higher bands, the lower range bands are also limited in terms of the amount of bandwidth each can offer. Generally speaking, the lower the number of hertz, the less data can be transmitted at a specific frequency.
This can be mitigated by the use of multiple frequencies transmitting many packets of data simultaneously, but as there's only so many times it can be done, it's not an effective solution. There's also the option of using more bands, though again this can only go so far.
For end users, this means they will be able to get a 5G signal, but it won't necessarily be able to operate at the headline gigabit-plus speeds that the carriers are screaming about, with the end-user getting closer to what is offered by 4G LTE now.
Faster but Fragile High-Frequency Bands and mmWave
On the other end of the scale, the higher bandwidth range is the one that stands to offer considerably higher data transfer rates. Where the lower band may only offer bandwidth in hundreds of megabits at best, the post-6GHz range stands to offer the gigabit speeds used to hype 5G.
Unlike the low-range bands that are used for many common applications, the high-range versions benefit from having relatively little competition, meaning there is more available bandwidth to use with minimal chance of interference.
The term mmWave is also used as part of 5G discussions, and it refers to millimeter wave, a set of spectrum bands that typically reside above 30GHz and below 300GHz. As the bands in the higher frequency range are either part of this group or pretty close to it, they are typically referred to by the title for the sake of convenience.
The ability to use mmWave in a commercial manner, especially with the promise of extremely high data transfer rates, has been a technological hurdle, and remains so. For example, it typically has a practical range measurable in hundreds of feet, meaning it is only really useful in areas with a larger density of potential users, rather than for rural applications.
Stand someplace outside and and aim a laser pointer at a telephone pole. If your vision is okay, and you can see the dot at night, in theory, that spot you're standing on can receive mmWave broadcasts from hardware on that pole, after installation.
We mentioned the laser pointer test being performed outside. There's a reason for this — unlike 4G LTE, mmWave is easily blocked by walls, glass, some metal screens on windows, tree leaves, rain, and other obstructions including the human body. This makes mmWave able to be used for fixed-point communications between buildings, or wirelessly from a telephone pole to a 5G modem on the outside of your house, but less useful for a smartphone used indoors.
In July, Qualcomm announced it had produced a fully-integrated 5G NR mmWave module for smartphones, one that actually uses up to four modules with each containing up to four antennas. Placed strategically in a smartphone or another device, this gives more opportunities for mmWave signals to be received or transmitted without being blocked by the user.
Due to these limitations, mmWave has already been discounted from being used for countrywide 5G coverage. In April, T-Mobile CTO Neville Ray argued mmWave "will never materially scale beyond small pockets of 5G hotspots in dense urban environments," citing its travel and penetration limitations.
Verizon chimed in one day later, with CEO Hans Vestberg commenting "We all need to remind ourselves this is not a coverage spectrum."
Ultimately, this means only urban-based users in areas that carriers see value in spending millions of dollars on infrastructure that can't just be tossed up on existing towers are the only areas that will benefit from the highest speeds 5G will be able to offer. As with the slow rollout of 4G, this leaves rural users to a connection that, while better than 4G LTE, won't live up to the hype that's already begun.
Spectrum Sharing with 4G LTE
As the lower band range encompasses spectrum used for current mobile communications, and that some bands in the 5G range have some crossover with those currently used for 4G LTE and older technologies, this means a new type of bandwidth management technology could be used by carriers.
Simply titled "Spectrum Sharing," it is a system where spectrum within a specific band can be allocated to either 4G or 5G network usage at any time. Under a system demonstrated by Ericsson at Mobile World Congress 2019, it was able to have a band used for both 4G and 5G connectivity within the same frequency carrier.
As the band can change the allocations to each at any time, based on the traffic demand for each, it can change the ratio to reduce one type of connectivity for another when warranted. For example, if there is a large number of 4G-based users connected to a mast and only one 5G device, the system could easily reduce the spectrum used for 5G coverage while offering more for 4G.
For carriers, this provides a number of benefits, including reducing the need to acquire or use more band licenses to provide 5G connectivity in an area. It also means that there isn't necessarily a need for both 4G and 5G equipment to be installed in the same location, and depending on the equipment, it could even roll out 5G with Spectrum Sharing enabled to existing supported 4G hardware via a software update in some cases.
Spectrum Sharing is a relatively elegant cost-saving and spectrum-saving solution for carriers, while also providing both 4G and 5G service in areas for consumers.
A Long Rollout
While the carriers are building up the hype for 5G, it will be quite some time before it becomes a meaningful thing to consumers. Sprint has expressed it will start launching its 5G service in a small number of cities in May, Verizon has named more cities it will be bringing 5G to by the end of 2019, and AT&T insists it will be able to nationally roll out 5G by early 2020.
However, it's worth mentioning that the US Federal Communications, and the carriers consider an area serviced, even if one address in an entire census block has the technology.
Even with the initial rollouts in limited areas, they are also of questionable value to consumers at this stage. Verizon offers a 5G Home service that works with the carrier's "proprietary 5G standard," meaning it effectively isn't compatible with other standard 5G hardware, but it does have the Moto Z3 and the Samsung Galaxy S10 5G as smartphones for its standard carrier service.
AT&T is in a relatively similar situation, where its 5G network is only compatible with the Netgear Nighthawk 5G Mobile Hotspot, though it is also working with Samsung to bring two 5G models to the network.
At this early stage, consumers simply don't have the breadth of choice available to them in terms of what devices they can use with 5G, let alone the inability to use 5G in the vast majority of the United States at this time. The international situation is somewhat better, but any kind of wide 5G rollout is still on the horizon.
As in the vast majority of cases carriers will need to add new equipment on the neighborhood level, and will have to make changes to existing technology on masts, the rollout of 5G will take a very long time due to the sheer scale of the area of the United States. The size also equals expense, with the changes to infrastructure likely to cost carriers billions to implement.
The cost of the rollout is also affected by the chicken-and-egg problem with consumer devices. As there are few consumer devices available on the market capable of connecting to a 5G network, there is little incentive for carriers to spend so much on upgrading their networks to a technology that barely anyone would use at the moment.
At the same time, the vast majority consumers are unlikely to want to buy a 5G smartphone, and won't be serviced for the price premium that they'll have to pay in the short term. The technology will almost certainly be limited to premium flagship models for the immediate future, unless there is enough access to a 5G network that they would be able to use.
Even with the rollout of infrastructure, consumers will not be able to enjoy the extremely high speeds 5G promises for quite some time longer. Standards for 5G communications are still being worked on, and even after being finalized, they have to be implemented by carriers in their respective networks.
A good example is 4G LTE, which has taken most of a decade to become widespread and accessible for most mobile users. It is highly likely that 5G will have a similar timescale before it becomes widely available, as well as offering those promised high speeds.
For the moment, the announcements for a 5G rollout are less of an indicator as to a carrier's progress, more one of marketing that they are ready for the future. Sadly, this has some unintended consequences.
AT&T conducted a questionable marketing campaign to try and encourage customers to use its "5G E" connection, which was really its 4G LTE service but in areas with network improvements. On April 22, AT&T and Sprint settled a lawsuit over the matter, though AT&T elected to continue using the marketing term, something which may continue to confuse customers into thinking they have a 5G-ready device when in fact it is just able to connect over 4G LTE.
Apple's Interest in 5G
The biggest issue with 5G for Apple is when the company will be able to offer devices that can connect using the technology. Unfortunately, for the iPhone itself, customers may have quite some time waiting.
Following the settlement with Qualcomm, which includes an agreement that allows Apple to use Qualcomm modems in the iPhone, this opens the door to the iPhone including a suitable 5G modem in the future. Due to the lead time in iPhone production usually necessitating a lockdown of designs and component selection up to nine months ahead of its launch, it means the settlement simply arrived too late to be able to introduce the modems to its supply chain.
Analysts are already tipping the iPhone models arriving in 2020 as most likely to have a 5G modem, which seems plausible given the legal situation and production schedules. It may also be advantageous to Apple to wait until fall 2020 to bring out the model, as it is probable the carriers will have made significant progress in rolling out their networks by that time, meaning Apple wouldn't be rolling out the connectivity support before it is ready for use.
It is also suggested that Apple will be including improved antenna technology in the 2020 iPad Pro refresh, paving the way to including 5G on the iPad in 2021.
Apple has previously expressed an interest in high-frequency bands like mmWave, recommending to the FCC in May 2018 it keep the "super-high" radio frequencies between 95 and 3,000 GHz open for use with 5G and other potential purposes. According to Apple's appeal to the regulator, the company suggests it operates with "the goal of encouraging a range of innovative business and engineering approaches that market forces determine best utilize these frequencies," and to avoid "restrictive regulations, band plans, or predictions" that could limit innovation.
5G is the future, but it isn't today
There is no doubt, 5G is coming. That's a good thing. But, as a technology, 5G isn't ready for prime time. And, even the carriers admit that the big-ticket high-speed aspects of 5G aren't for everybody, or even every area.
Yes, even if Apple had a 5G phone in 2019, we'd be saying this.
We've been here before. Apple critics burned a lot of hours talking about how the company was late to 3G, then again to 4G. In both of those times, the carriers were harping away at the benefits of a network that wasn't available to many at all, and charging top-dollar for those connections that weren't any better than the predecessor.
And, that grist mill is cranking up again, as evidenced by Tuesday's earnings call where Apple CEO Tim Cook literally said that he was punting an answer to not one, not two, but three questions from analysts about it.
We're looking forward to the 5G future. We want to see secure autonomous cars ripping down major highways, we want to see ubiquitous 5G technology with the potential to increase efficiencies by shippers, help out with traffic flows, speed emergency responders' arrivals to those in need, and all the other things that the carriers have promised will come with that technology.
But, none of it is here, yet. And, it's going to take a while to get there.