Band 1 (2100 MHz)
Understanding Band 1
Band 1 holds a unique place in mobile telecommunications history as the frequency allocation that enabled global 3G roaming. Before Band 1, regional spectrum fragmentation (GSM 900, GSM 1800, PCS 1900, CDMA 800) made international handset compatibility difficult. The ITU's IMT-2000 framework harmonized the 2100 MHz range for 3G across most of the world, and Band 1 became the universal WCDMA band supported by virtually every 3G and 4G handset manufactured since 2003.
The 60 MHz paired allocation is divided among operators in each country, typically as two or three blocks of 15 to 20 MHz each. A 20 MHz LTE carrier on Band 1 delivers approximately 100 Mbps peak downlink with 4×4 MIMO and 256-QAM. Many operators now deploy three technologies simultaneously on Band 1: legacy UMTS in 5 MHz blocks, LTE in 15 to 20 MHz blocks, and 5G NR via DSS sharing the LTE carrier. The band will eventually be fully refarmed to 5G NR as 3G networks are sunset globally.
Band 1 Technical Parameters
UL: 1920 – 1980 MHz (60 MHz)
DL: 2110 – 2170 MHz (60 MHz)
Duplex spacing: 190 MHz
Path Loss (3GPP urban macro model):
PL = 128.1 + 37.6 log(dkm) dB at 2 GHz
1 km: 128.1 dB | 3 km: 146.0 dB | 5 km: 154.4 dB
UMTS Channel: 5 MHz (3.84 Mcps WCDMA)
LTE Max Channel: 20 MHz
NR Max Channel (n1): 20 MHz (FR1 FDD)
Band 1 Global Deployment
| Region | Technology | Major Operators | Status |
|---|---|---|---|
| Europe | UMTS + LTE + NR | Vodafone, Orange, DT, Telefónica | Active (LTE primary) |
| Japan | UMTS + LTE + NR | NTT DoCoMo, SoftBank, KDDI | Active (NR refarming) |
| South Korea | LTE + NR | SK Telecom, KT, LG U+ | Active (3G sunset) |
| India | UMTS + LTE | Jio, Airtel, Vi | Active |
| Latin America | UMTS + LTE | América Móvil, Telefónica | Active |
Frequently Asked Questions
Where is Band 1 deployed globally?
Band 1 is deployed across Europe, Asia, Africa, and Latin America for UMTS and LTE. In Japan and South Korea, it is being refarmed to 5G NR. Not used in the US (covered by AWS). Its global harmonization makes it the most widely supported band in smartphone chipsets.
How does Band 1 compare to other mid-band allocations?
At 2.1 GHz, Band 1 provides 1 to 3 km urban cell radius with reasonable building penetration, similar to Band 3 (1800 MHz) and AWS. More capacity than low-band (700 to 900 MHz), less than C-band (3.5 GHz). Path loss is ~3 dB higher than 1.5 GHz and ~6 dB lower than 3.5 GHz. The 60 MHz allocation supports up to three 20 MHz LTE carriers.
What is the relationship between Band 1 and Band n1?
Band n1 is the 5G NR equivalent, using the same frequencies in FDD mode. Operators deploy NR on n1 via Dynamic Spectrum Sharing (DSS), allowing LTE and NR to coexist on one carrier. This enables gradual 4G-to-5G migration without new spectrum. NR adds 256-QAM uplink and enhanced MIMO beyond original LTE Band 1 specs.