Wireless Standards and Protocols Cellular and 5G Informational

What is the difference between 5G NR FR1 and FR2 frequency ranges and their RF requirements?

What is the difference between 5G NR FR1 and FR2 frequency ranges and their RF requirements? 5G New Radio (NR) defines two frequency ranges with fundamentally different RF design challenges: (1) FR1 (410 MHz to 7.125 GHz): also called sub-7 GHz or sub-6 GHz (originally defined up to 6 GHz, extended to 7.125 GHz in Release 17). Key bands: n77 (3.3-4.2 GHz), n78 (3.3-3.8 GHz), n79 (4.4-5.0 GHz), n41 (2.496-2.69 GHz), n71 (617-652/663-698 MHz). Channel bandwidth: 5-100 MHz. Modulation: up to 256QAM. Duplexing: TDD and FDD. RF front end: conventional architecture (discrete PA, LNA, filters, switches). Power amplifier: LDMOS or GaN for base stations (20-40W per carrier), GaAs or CMOS for handsets (23-26 dBm). Antenna: conventional or massive MIMO (64T64R arrays at base station). (2) FR2 (24.25-52.6 GHz): commonly called millimeter wave (mmWave). Key bands: n257 (26.5-29.5 GHz), n258 (24.25-27.5 GHz), n260 (37-40 GHz), n261 (27.5-28.35 GHz). Channel bandwidth: 50-400 MHz (much wider than FR1). Modulation: up to 64QAM (lower than FR1 due to higher path loss and phase noise challenges at mmWave). Duplexing: TDD only (no FDD at mmWave). RF front end: integrated antenna-in-package (AiP) modules. Beamforming: analog or hybrid beamforming is mandatory (to overcome the high free-space path loss). Antenna: phased arrays with 64-256 elements per panel. EIRP: 55-65 dBm for base station, 23-43 dBm for UE. (3) Key RF differences: path loss: FR2 has 20-30 dB more free-space path loss than FR1 at the same range (FSPL increases as 20log(f)). This is compensated by high-gain beamforming antenna arrays. Penetration loss: FR2 signals are heavily attenuated by building materials (10-40 dB through glass, 20-50 dB through concrete). FR1 penetrates much better. PA technology: FR1 uses GaN (base station) and GaAs/CMOS (handset). FR2 uses SiGe BiCMOS or GaAs for the beamforming elements (lower power per element, 10-15 dBm, but many elements).

Category: Wireless Standards and Protocols

Updated: April 2026

Product Tie-In: Filters, PAs, Switches, Front End Modules

5G NR FR1 vs FR2

The FR1/FR2 split represents two fundamentally different RF engineering paradigms: FR1 is an evolution of LTE technology with incremental improvements, while FR2 requires entirely new antenna and front-end architectures based on phased array beamforming.

Deployment Differences

(1) Coverage: FR1 provides wide-area coverage (cell radius: 1-10 km, similar to LTE). FR2 provides high-capacity hotspot coverage (cell radius: 100-300 m). FR2 requires 10-50× more base stations than FR1 for the same coverage area. (2) Capacity: FR2 provides 10-100× more throughput than FR1 (due to wider channel bandwidth: 400 MHz vs 100 MHz). Peak throughput: FR1 = 1-2 Gbps. FR2 = 4-20 Gbps. (3) Latency: both FR1 and FR2 support sub-1 ms air interface latency (URLLC mode). The beamforming overhead in FR2 adds a small latency for beam management (beam search, beam tracking).

5G NR Frequency Ranges

FR1: 410 MHz-7.125 GHz, BW ≤ 100 MHz
FR2: 24.25-52.6 GHz, BW ≤ 400 MHz
FR2 path loss: +20-30 dB vs FR1 (same range)
FR2 EIRP: 55-65 dBm (BS), 23-43 dBm (UE)
FR2: TDD only, beamforming mandatory

Common Questions

Frequently Asked Questions

Which FR is more widely deployed?

FR1 is far more widely deployed (2024-2026). FR1 sub-6 GHz provides the backbone of 5G coverage worldwide. Over 90% of 5G base stations are FR1 only. FR2 (mmWave) is deployed primarily in dense urban areas, stadiums, and airports in the US (Verizon, T-Mobile, AT&T), Japan (NTT DoCoMo, KDDI), and South Korea (SK Telecom, KT). FR2 deployment is accelerating as the cost of AiP modules decreases.

Can a device support both FR1 and FR2?

Yes. High-end 5G smartphones (Apple iPhone 14+, Samsung Galaxy S23+, Google Pixel 7 Pro) support both FR1 and FR2. The RF front end for a dual-FR device includes: multiple FR1 bands (typically 10-15 bands with carrier aggregation), one or more FR2 AiP modules (typically 2-4 modules for coverage in different orientations), and a modem that supports both (Qualcomm Snapdragon X70/X75, MediaTek M80). The FR2 modules add approximately $20-40 to the BOM cost.

What about FR2-2?

3GPP Release 17 introduced an extension: FR2-2 covering 52.6-71.0 GHz. This includes the 57-71 GHz band (previously used for WiGig/802.11ad). FR2-2 is intended for ultra-high-capacity short-range links (indoor hotspots, fixed wireless access). The RF challenges are even more severe than FR2 (higher path loss, oxygen absorption at 60 GHz). FR2-2 deployment is expected in 2026-2028.

Keep Reading