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JTOWER's New Remote Unit for 5G Subway Networks

In a significant leap towards enhancing the 5G communication infrastructure in subways across Japan, JTOWER Inc., led by CEO Atsushi Tanaka, has successfully completed the development of a new Remote Unit (RU) designed specifically for subway environments. This development is part of JTOWER's commitment to improving mobile network capabilities in constrained environments like underground transit systems.

Background of the Development

JTOWER was selected as one of the collaborating partners by the Japan Mobile Communications Infrastructure Association (JMCIA) in March 2026. This initiative aims to accelerate the establishment of 5G networks and stimulate the infrastructure sharing market nationwide. JTOWER is poised to collaborate closely with JMCIA and various rail operators to construct efficient and rapid 5G communication facilities in subway stations.

Key Features of the New Remote Unit

The newly developed RU will connect seamlessly with JTOWER's already established 5G shared device, the J-DAS 5.1. The unique challenges posed by subway environments—such as dust, vibrations, limited installation space, and maintenance constraints—necessitate specific design considerations that differ from those of typical indoor settings. To enhance reliability in these conditions, the RU features a dust and water-resistant design.

Furthermore, JTOWER has achieved a remarkable 34% reduction in the volume of the device compared to existing models, enhancing its installation versatility in confined spaces. The RU is optimized for the 3.7 GHz frequency band utilized by four major mobile carriers, allowing for high output while reducing power consumption by 45%. This advancement aligns with JTOWER's strategy to support the frequency bands of various mobile carriers through its core system of Main Unit (MU), Hub Unit (HU), and Remote Unit (RU).

Technical Development Structure at JTOWER

One of JTOWER's critical strengths lies in its dedicated technical development team, which ensures that the quality requirements of mobile carriers and site-specific environmental conditions are met. This internal capability facilitated the swift integration of necessary specifications for 5G deployments in subway systems, allowing the completion of the new device ahead of scheduled infrastructure improvements.

Future Prospects

JTOWER is currently in the process of certification discussions with mobile carriers. The introduction of the new RU is anticipated to begin in 2027, aligned with the ongoing enhancements of 5G communication environments in subways. Moving forward, JTOWER will continue to work closely with JMCIA, rail operators, and mobile carriers to improve communication conditions in areas traditionally challenged by signal strength. Additionally, they aim to contribute to sustainable and efficient communication infrastructure through improved infrastructure sharing practices.

Technical Specifications of the New Device

• - Type: Remote Unit (RU) designed for subway environments
• - Compatibility: Connects with J-DAS 5.1 for enhanced 5G services
• - Durability: Dust and waterproof specifications for harsh subway conditions
• - Capacity Reduction: 34% reduction in size compared to previous units for better installation
• - Frequency Range: Customized for 4 major carriers utilizing the 3.7 GHz band
• - Power Efficiency: 45% reduction in power consumption while increasing output
• - Deployment: Expected rollout starting in 2027

For those interested in joining JTOWER's innovative team, the company actively seeks talented individuals to drive forward its mission. For more information on job openings and applications, visit JTOWER's official website. JTOWER, established in June 2012 as Japan's first infrastructure sharing company, aims to provide cutting-edge solutions for mobile communications, aspiring to share best practices globally.