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Telecom Business Review | Thursday, November 16, 2023
As the world embraces 5G, the evolution of Distributed Antenna Systems (DAS) is essential to meet the challenges of providing indoor coverage and filling coverage gaps.
FREMONT, CA: As cellular networks transition to the era of 5G, the role of Distributed Antenna Systems (DAS) in providing in-building coverage and filling coverage gaps becomes crucial. However, deploying 5G DAS comes with unique challenges compared to previous generations. In addition to covering new bands, 5G DAS must support multi-antenna operation for advanced antenna systems (AAS) beamforming and MIMO techniques that enable 5G capabilities. The electrical performance of 5G DAS must also be superior to support the desired speed and coverage goals. Addressing these challenges is essential for network and antenna solutions providers.
While much of the discussion around cellular deployment focuses on outdoor usage, studies have shown that over 80 percent of voice and data usage for handsets occurs indoors. Therefore, a significant demand for 5G services will come from users located in buildings. While outdoor cellular networks can cover users outside, they often fall short of providing adequate coverage in indoor spaces such as mass transit systems, large venues, office spaces, and warehouses. The high-frequency spectrum used by 5G signals has limited penetration capabilities, particularly in buildings with concrete and low emissivity glass.
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The challenges posed by 5G DAS deployment are similar to those faced by traditional DAS systems. The task is to ensure cellular coverage in large, complex structures comprised of diverse materials, reflective and absorptive surfaces, and unconventional layouts. In traditional cellular deployments, an external antenna connects to a cellular base station or tower. Dedicated or nearby base stations may route signals into the DAS in large venues.
Designing an appropriate layout for DAS antennas, remote radio heads, or nodes and determining the DAS architecture are vital challenges for network designers. Factors to include RF cable runs, repeater antennas, fiber optic, and Ethernet interconnections, and ensuring adequate coverage with the desired frequency bands. With the increasing popularity of Wi-Fi, DAS designers must also provide multi-operator cellular services alongside Wi-Fi services. Upgrading DAS hubs, antennas, and interconnects to accommodate new frequency bands while meeting customer expectations for service coverage has been a common solution to these challenges.
Apart from extending the frequency range to accommodate Wi-Fi 6e, 5G mid-band systems differentiate themselves from legacy cellular technologies in terms of capabilities. While 4G/LTE introduced relatively simple multi-antenna MIMO technologies, 5G standards introduced more advanced multi-antenna technologies and beamforming to enhance coverage and data rates for multiple users. To provide the same capabilities as 5G network antennas, DAS must become more complex and capable with multi-antenna technology. DAS's distribution system and infrastructure must support the higher data rates and coverage enabled by 5G AAS technology. This includes handling higher capacities regardless of the 5G signal source. 5G DAS must also support legacy 4G/LTE cellular systems and the new 5G frequency bands and technologies.
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