In recent years, the fifth generation of mobile networks, 5G, has begun to spread across much of Italy, gradually replacing 4G. This article provides a comprehensive analysis of the differences between 4G and 5G, how network infrastructures work, real-world performance, traffic management, and future prospects. The goal is to understand how these technologies are transforming the way we connect, communicate, and use digital services.
Main Differences Between 4G and 5G
4G and 5G networks represent two generations of cellular technology defined by the International Telecommunication Union (ITU). 4G, based on LTE and LTE-Advanced, enabled high-resolution multimedia content and stable video streaming. 5G, on the other hand, is designed to deliver significantly higher performance, with much faster data transmission, extremely low latency, and the ability to manage millions of connected devices simultaneously.
Currently, both technologies coexist, but over the medium term, 5G will gradually replace 4G, paving the way for innovative applications and smart services.
Data Transmission Speed
4G can reach theoretical speeds of up to 1 Gbps under ideal conditions, with real-world speeds typically between 10 and 50 Mbps. 5G, however, can exceed 1 Gbps in real scenarios and reach up to 20 Gbps in optimal conditions. This translates to instant downloads, high-quality streaming without buffering, and support for advanced multimedia applications such as augmented reality and cloud gaming.
Ultra-Low Latency
One of 5G’s major strengths is its latency, which can drop to as low as 1 millisecond, 30–50 times lower than 4G. This is crucial for applications that require immediate response times, such as autonomous vehicles, smart surveillance, critical IoT devices, and augmented or virtual reality applications.
Capacity and Bandwidth
5G uses wider frequency bands than 4G, enabling the transmission of large amounts of data simultaneously. This allows millions of devices to connect without network congestion, an essential requirement for smart cities and large-scale Internet of Things (IoT) deployments.
Frequencies and Coverage
In Italy, 5G operates on different frequency bands than 4G: 700 MHz, 3.6–3.8 GHz, and 26 GHz, whereas 4G uses 800 MHz, 1800 MHz, and 2600 MHz. Higher 5G frequencies allow for greater speeds but cover shorter distances, requiring a higher density of antennas. This does not mean more radiation power; more antennas actually reduce the emission of each station and improve energy efficiency. In some areas, frequencies previously used for TV broadcasting are repurposed to enhance coverage in underserved locations.
How 4G and 5G Networks Work
Both 4G and 5G networks rely on complex infrastructures that include antennas, base stations, and core network systems. In 4G, a smartphone communicates with the eNodeB, which is connected to the Evolved Packet Core (EPC), comprising MME, SGW, PGW, HSS, and PCRF.
5G uses the gNodeB and a modular network core (5GC) with a Service-Based architecture, enabling advanced functionalities such as network slicing, edge computing, and flexible mobility management.
Beam Steering and MIMO
5G significantly improves network efficiency through advanced technologies. Beam Steering allows antennas to direct signal beams toward devices requiring higher traffic, optimizing bandwidth distribution. MIMO (Multiple Input Multiple Output) enables the simultaneous transmission of multiple data streams, increasing speed and reducing congestion. Unlike 4G, which typically uses 2x2 configurations, 5G uses 4x4 or 8x8 setups, supporting more stable and faster connections.
Small Cells and DAS
In urban centers or high-density spaces, Small Cells—low-power mini-antennas—and DAS (Distributed Antenna Systems), networks of small radiating nodes connected to a single central hub, are used. These solutions are ideal for airports, subways, and large shopping centers.
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What’s the Difference Between a 4G and a 5G Phone?
To take advantage of 5G, having an available network is not enough; a compatible device is required. 5G smartphones integrate modems and antennas capable of handling different frequencies, including mmWave (FR2), as well as technologies like Massive MIMO and Beam Steering. For example, some iPhone 12 models in the United States include mmWave antennas, while in Italy only sub-6 GHz (FR1) frequencies are used, which are slower but have better coverage. This means maximum speed varies from device to device.
Signal Management and Performance
Connection speed can also vary due to network engineering decisions. Base stations may turn off certain bands during low-traffic hours to save energy, reactivating them automatically when demand increases. Smartphone signal bars do not indicate the true quality of the connection; technical parameters such as RSRP, RSRQ, SNR, and Cell ID are needed to evaluate actual network performance.
Infrastructure and Operators
Antennas are not built directly by operators; companies such as Inwit, Cellnex, or local tower companies construct and manage the structures on behalf of operators. Collaboration between tower companies and operators is essential to extend coverage and ensure high performance, especially for 5G, which requires a higher density of antennas.
Summary
The transition from 4G to 5G represents a significant technological leap. 5G offers much higher speeds, lower latency, massive capacity, and smarter infrastructures, enabling innovative applications in IoT, smart cities, augmented reality, autonomous vehicles, and telemedicine. Understanding how mobile networks work helps better interpret device performance and seize the opportunities this new generation of connectivity provides for daily life and the digital future.
Reference: Salman, Hasan & Alsajri, Abdulazeez & Kalakech, Ali & Steiti, Amani. (2023). Difference Between 4G and 5G Networks. Babylonian Journal of Networking. 2023. 41-54. 10.58496/BJN/2023/006.