ALLPCB
Overview
As demand for mobile communications continues to increase, traditional lower-frequency bands face spectrum congestion. Millimeter-wave bands offer higher frequencies and larger bandwidths, enabling higher data rates and greater capacity to help meet growing mobile data demand.
Many mobile network operators began deploying commercial 5G millimeter-wave networks in 2020. Large-scale millimeter-wave deployment appears on the roadmaps of multiple operators. As a result, 5G chipset, device, and base station manufacturers are enhancing design and manufacturing capabilities to support more 5G millimeter-wave products and services. Millimeter-wave technology will play an increasingly important role in 5G communications. The high-frequency millimeter-wave bands provide wider bandwidth and faster transmission rates for 5G, improving experience and service for various mobile applications and Internet of Things devices.
Key Advantages
High data rates
Millimeter-wave bands have higher frequencies and wider bandwidths, enabling much higher data transmission rates. This allows 5G networks to support faster downloads and uploads, improving application performance and user experience.
High capacity
Because of the large available bandwidth in millimeter-wave bands, 5G networks can support significant data traffic, providing stable and efficient connectivity for an increasing number of connected devices. This is important for the rapid growth of Internet of Things deployments and smart city applications.
Ultra-dense networks
Millimeter-wave technology supports denser network deployments, i.e., ultra-dense networks. Deploying more small cells increases coverage and capacity, helping to relieve congestion in high-density user areas.
Improved indoor coverage
Millimeter-wave signals have poor penetration in indoor environments and are easily blocked. However, deploying additional small cells or micro base stations indoors can mitigate this limitation and provide better indoor coverage and service quality.
Low-latency communication
High frequencies enable faster transmission, which can reduce latency. This is critical for real-time applications and low-latency scenarios such as virtual reality, augmented reality, and autonomous driving.
Challenges and Technical Considerations
Although millimeter-wave technology plays an important role in 5G, it introduces many challenges in design, manufacturing, and deployment workflows, such as limited transmission range, poor penetration, spectrum management, and higher device cost and complexity. At millimeter-wave frequencies, significant path loss limits RF power and increases cost. Millimeter-wave frequencies also require fundamentally different test methods.
For 5G NR and emerging applications such as 802.11ay, propagation loss at millimeter-wave frequencies requires phased-array techniques and beam control to achieve adequate signal-to-noise ratio and link quality. Phased-array techniques allow an antenna system to adjust radiation direction and beam shape as needed to optimize transmission and reception. 5G millimeter-wave phased-array technology uses antenna arrays composed of multiple elements; by adjusting the phase and amplitude of each element, it can precisely control the radiation direction. This concentrates energy in specific directions, improving transmission efficiency and capacity.
5G millimeter-wave phased-array technology also supports multiuser MIMO (MU-MIMO). This allows a base station to communicate with multiple user devices simultaneously, each receiving a dedicated beam, thereby increasing overall network throughput and performance.
