5G Sub-6 GHz: what it is, how it works and what it does
5G Sub-6 GHz refers to frequency bands below 6 GHz used for 5G connectivity, divided into TDD and FDD modes. It offers a balance between coverage and capacity, being fundamental for 5G network expansion.
Definition and Principles
The term 5G Sub-6 GHz designates the set of radio frequencies located below 6 GHz that are employed for fifth-generation (5G) technology. Unlike millimeter-wave (mmWave) bands, these frequencies allow better penetration through obstacles and greater geographic coverage, while maintaining data speeds significantly higher than previous generations such as LTE.
Band Architecture
The technical implementation of 5G Sub-6 GHz is primarily classified into two modes of multiple access, according to available technical evidence:
- Sub6 TDD (Time Division Duplex): Uses bands
n38,n40,n41,n77, andn78. This mode allows flexibility in uplink and downlink resource allocation. - 5G Sub6 FDD (Frequency Division Duplex): Employs bands
n1,n3,n5,n7,n8,n12,n20,n28, andn66. This mode physically separates transmission and reception frequencies.
Applications and Scope
These bands are the cornerstone of most current global 5G deployments due to their ability to provide an optimal balance between bandwidth and coverage. They are compatible with devices supporting GSM, HSPA, LTE, and 5G networks, allowing a gradual transition and coexistence with previous mobile infrastructures.
Interpretation in Products
The presence of 5G Sub-6 specifications in a device indicates that it is capable of connecting to the most commercially extended 5G networks. It does not guarantee access to high-frequency (mmWave) bands, but ensures compatibility with the standard 5G infrastructure of most global operators.
Limitations
Although superior to low-frequency bands in terms of speed, 5G Sub-6 GHz does not reach the maximum theoretical speeds of millimeter-wave bands. Its performance depends on antenna density and network congestion in the coverage area.