FR1 vs FR2
5G NR splits its spectrum into two frequency ranges. FR1 covers 410 MHz to 7125 MHz — the sub-6 GHz bands (often just called sub-6, even though the upper edge now sits a little above 6 GHz). This is the coverage layer: it travels well, gets indoors, and gives you up to 100 MHz of channel bandwidth per carrier. FR2 is millimeter wave, 24.25 GHz to 52.6 GHz, with FR2-2 extending the range up toward 71 GHz. Here you get enormous bandwidth — up to 400 MHz per carrier — but the signal fades fast, struggles through walls, and is easily blocked, even by a hand on the phone.
So they aren't competitors. FR1 is the workhorse that carries the network and reaches users; FR2 is a capacity overlay you point at specific hotspots. Almost every macro 5G network runs on FR1; FR2 shows up where you need raw throughput in a small, dense area.
| Aspect | FR1 (sub-6 GHz) | FR2 (mmWave) |
|---|---|---|
| Frequency range | 410 MHz - 7125 MHz (sub-6 GHz) | 24.25 GHz - 52.6 GHz (FR2-1); FR2-2 extends toward 71 GHz |
| Max channel bandwidth | Up to 100 MHz per carrier | Up to 400 MHz per carrier |
| Subcarrier spacing (SCS) | 15, 30 or 60 kHz | 60 or 120 kHz (data on 120 kHz) |
| Coverage / cell range | Hundreds of metres to several km; good macro reach | Tens to a few hundred metres line-of-sight |
| Propagation | Penetrates walls and foliage reasonably; rain barely matters | Blocked by walls, foliage, rain and even a hand; needs line of sight |
| Beamforming | Helpful for capacity; gNB works fine without narrow beams | Mandatory — narrow beams overcome path loss; lose the beam, lose the link |
| Antennas | Multi-antenna and Massive MIMO panels at the gNB | Large phased arrays both ends; small elements thanks to short wavelength |
| Deployment density | Sparse macro grid | Dense — many small cells to fill coverage holes |
| Capacity vs coverage role | Coverage layer carrying most traffic | Capacity overlay for high throughput |
| Typical use | Wide-area mobile, indoor, rural, FWA | Stadiums, venues, dense urban hotspots, short-range FWA |
| Devices | Every 5G phone supports FR1 | Only some phones (extra mmWave antenna modules); often region-specific |
Why FR2 needs beamforming
Path loss climbs with frequency, and at 28 GHz a signal radiated in all directions arrives far weaker than the same power at 3.5 GHz. mmWave also takes a bigger hit from oxygen and rain absorption. The fix is to stop spraying power everywhere and instead focus it into a narrow beam aimed at the user — that antenna gain is what buys back the link budget.
The short wavelength helps here: at mmWave you can pack dozens of antenna elements into a few square centimetres, so phased arrays fit in both the gNB and the handset. The cost is fragility. A narrow beam has to track a moving user, and if a body, a wall, or a hand steps into the path the link can drop in milliseconds, so the network keeps fallback beams ready. On FR1 beamforming and Massive MIMO still add capacity, but the cell works perfectly well without a pencil beam pointed at you.
Coverage vs capacity: the core trade-off
This is really the whole story. Lower frequencies travel further and bend around obstacles, so one FR1 cell covers a wide area and reaches indoors — but the band is narrow, so capacity per cell is capped. Higher frequencies open up huge swaths of spectrum, so FR2 can deliver multi-gigabit throughput, but only across a small footprint that thins out the moment something blocks the path.
The wider SCS on FR2 (120 kHz for data) shortens each OFDM symbol, which helps fight the phase noise you get at mmWave and trims latency — but it also widens each subcarrier, which is only practical because there's so much bandwidth to spend. You can't get both reach and raw capacity from one band, which is exactly why operators run them as layers rather than alternatives.
Where FR2 actually makes sense
FR2 pays off where lots of people need lots of data in a small, fairly static area: a packed stadium, an arena concourse, a transit hub, a dense downtown block. Coverage is patchy and you may need several radios to light up one venue, but the throughput per user is hard to match on sub-6.
The other strong case is fixed wireless access over short hops — a rooftop or window unit with a clear line of sight to the gNB, where you can mount a decent antenna and nobody is walking through the beam. For ordinary wide-area mobile coverage FR2 rarely makes economic sense; the cell count needed to blanket a city would be enormous. That job stays with FR1.
The bottom line
Think of them as layers, not rivals. FR1 carries the network — it provides the coverage, reaches indoors, and handles the bulk of traffic, so it underpins essentially every 5G deployment. FR2 is a targeted capacity layer you add where demand is concentrated and a line of sight exists: venues, dense hotspots, short-range fixed wireless.
If you're planning or studying a network, start from FR1 for coverage and treat FR2 as a surgical add-on, not a substitute. And if you only remember one line: sub-6 gets you everywhere, mmWave gets you speed in a small spot.
Frequently asked questions
- Is mmWave the same as 5G?
- No. mmWave is just one slice of 5G — the FR2 bands from 24.25 GHz up. Most 5G runs on sub-6 GHz (FR1), and plenty of 5G networks use no mmWave at all. So mmWave is a flavour of 5G, not a synonym for it.
- Why is mmWave range so short?
- Higher frequencies lose energy faster over distance, are absorbed more by rain and oxygen, and barely penetrate walls or foliage. They are also easily blocked — even a hand on the phone can interrupt the link. Narrow beamforming claws some of that back, but range still measures in tens to a few hundred metres.
- What bandwidth can FR2 reach?
- Up to 400 MHz per carrier, against a 100 MHz ceiling on FR1. Operators carrier-aggregate several FR2 carriers together, which is how mmWave delivers multi-gigabit throughput — the wide channels are the entire point of the band.
- Do all 5G phones support FR2?
- No. Every 5G phone supports FR1, but FR2 needs dedicated mmWave antenna modules that add cost and only help where mmWave is deployed. Support is often region-specific — a model sold in one market may include mmWave while the same model elsewhere does not.
Related terms
Go deeper than FR1 vs FR2 — free for 7 days.
Learn FR1 vs FR2 and the full 5G/6G stack with interactive lessons, labs and a TelcoMentor AI coach. Start a free 7-day Pro trial — no credit card.
- No credit card
- Full Pro access
- 21 verifiable certs
- TELCOMA since 2009
Get weekly 5G/LTE engineering deep-dives
One technical breakdown every Tuesday — plus first access to new tools and lessons. No spam, no marketing, just engineering. Unsubscribe in one click.