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Safer and More Resilient Connected World

KDDI's Approach (Management and Improvement of Network Quality)

Our mission as a telecommunications carrier is to ensure a communication environment where customers can use mobile phones, smartphones, landline phones, and fixed data connections easily anytime anywhere. KDDI will offer safe and secure communications services by engaging sincerely in every operation from quality management and improvement of communications infrastructure, such as mobile phone base stations and switching equipment for landline phones, to building next-generation networks.

Network Service Quality Management System

KDDI owns numerous telecommunications equipment such as fiber optic cables, base stations, and transmission exchange equipment, and carries out maintenance and management through Operation Divisions including Network Centers installed nationwide. Two operation centers located in Tokyo and Osaka conduct centralized monitoring of network conditions nationwide 24 hours a day, 365 days a year. In the event of a failure, these centers manage communications, working with maintenance divisions throughout Japan. In terms of service quality, under a cross-organizational management structure, we strive to consistently provide high-quality and stable telecommunication services by adhering to our rigorous quality management standards, which we have independently established, and through ongoing analysis and improvement. We have also established work procedures based on concepts such as capacity design for telecommunications equipment, functional redundancy, distributed facility arrangement, and functional safety. We conduct over 20,000 training sessions each year.

Frequency and Duration of Network Interruption

In the event that network failure or maintenance causes any inconveniences to our customers' communications, we will make notice about it on the failure and maintenance information page at our website.

Expansion of Service Areas (Base Station Facilities)

Our mission is to offer a stable call and data transmission environment around the clock with a motto of "connecting and protecting lives, connecting day-to-day lives, and connecting hearts and minds." We will aim to build a 5G telecommunications network together with au 4G LTE communications network (800 MHz platinum band, etc.) across Japan to provide a more comfortable telecommunications environment. The 5G service, offering an advanced telecommunications environment with low latency and high capacity, is eagerly anticipated by many of our customers. We intend to expedite its nationwide deployment further.
In addition, KDDI is working to introduce Japan's first "Starlink" satellite telecommunication service using non-geostationary satellite provided by SpaceX. This will use high-speed, high-volume telecommunication as backhaul lines at au base stations to realize high-speed Internet communication using au mobile phones in mountainous areas and isolated islands.
We will also strive to offer au mobile phone and smartphone users a reliable communications environment in crowded areas as well as airports, commercial facilities, event halls, and other in-house spaces.

Building Mobile Phone Base Stations and Care for Neighbors

To offer a reliable communications environment to au mobile phone and smartphone users, KDDI sets up mobile phone base stations in all parts of Japan to support new services and improve service area quality for our customers' safe and comfortable life. When designing and building a new, safe and reliable base station, we observe the Radio Law, Building Standards Act and other relevant laws and regulations as well as municipal ordinances and guidelines. The installation work is carried out by an experienced, designated construction company under a thorough safety management scheme. In cases where the construction is expected to cause a nuisance or inconvenience to the residents in the neighborhood due to an increase in construction vehicle traffic and noise, or if we receive inquiries about the base station, we share general information about the base station and explain about the construction work to ensure their understanding and cooperation.

Safety of Radio Waves

KDDI's Approach (policy)

In compliance with the laws and regulations related to radio waves, we at KDDI offer our mobile phones and operate our mobile phone base stations in Japan at an electromagnetic wave level below the limits set at the Radio Radiation Protection Guidelines (RRPGs).


Japan's Ministry of Internal Affairs and Communications established the Radio Radiation Protection Guidelines (RRPGs), which serves as a standard in the use of radio and TV waves, and introduced regulations based on these guidelines. The RRPGs, equivalent to the international guidelines advocated by the World Health Organization (WHO), set the limits based on the results of studies conducted across nations with safety factors fully taken into account. It is commonly acknowledged among experts from WHO and other international institutions that electromagnetic wave exposures below the limits will not have any known consequence on health.
We at KDDI take great care to ensure that the radio waves from our mobile phone base stations poses no threat to safety. We design, build, maintain and periodically inspect our base stations in strict compliance with the relevant laws and regulations, including the RRPGs, stipulated in the Radio Law and the Building Standards Act, as well as local government ordinances. We also explain to residents in local communities that the radio waves transmitted from our base stations comply with RRPGs standards.
In addition, we offer mobile phones that comply with the permissible values for radiation strength and absorption by the human body stipulated in radio-wave-related laws and regulations while disclosing that information on our website.

Research That Ensures the Safety of Radio Waves

In November 2002, KDDI began conducting joint experiments with NTT DOCOMO Inc. and Soft Bank Corp., using human cells to evaluate the impact of radio waves for mobile phones on living organisms. Some results of the experiments were published in an interim report in 2005, and the final report issued in 2007 concluded that radio waves for mobile phones have no confirmed effect on living organisms at the cellular level or genetic level. This research serves as an example of scientific evidence that refutes claims that radio waves may cause cancer affecting cell structure and function. It also reaffirms the safety of radio waves emitted from mobile phone base stations.
Additionally, KDDI actively participates in research activities related to the safety of mobile phone radio waves conducted by the Association of Radio Industries and Businesses (ARIB) Electromagnetic Environment Committee, along with other mobile phone carriers. For detailed information about the research activities, please refer to the Electromagnetic Environment Committee's website "Radio Waves in Daily Life". We will continue to actively collaborate with relevant organizations on research and testing on impacts of the radio wave frequencies used for mobile phones on the human body and on medical equipment. Regarding domestic and international research trends on radio wave safety, we provide relevant information on our website and make every effort to provide thorough explanations and ensure your understanding when you inquire about topics related to radio wave safety.

Organizations to Which KDDI Belongs or Is Giving Its Cooperation

Affiliation Electromagnetic environment committee of Association of Radio Industries and Businesses (ARIB), Electromagnetic Compatibility Conference Japan
Affiliation The National Institute of Information and Communications Technology (NICT) / EMC-net
Study Group on the Evaluation of Human Exposure to Electromagnetic Fields
Affiliation Japan national committee of the IEC / TC106 (Methods for the assessment of electric, magnetic and electromagnetic fields associated with human exposure)
Working Group on the Evaluation of Electromagnetic Fields around Base Stations
Research cooperation Mobi-Kids Japan (study investigating the effects of mobile phones on health)

Providing a Convenient Usage Environment: Signal Support 24

As part of detailed quality improvement efforts for each customer, we offer Signal Support 24, an after-sales support service concerning signal-related problems, for all customers using au mobile phones.
In this service, KDDI staff visit the homes of customers who have inquired about signal quality and examine the reception conditions for au mobile phones. We contact the customers to set up an appointment within 24 hours of their inquiry, and then visit to check the signal and improve the signal quality using au Femtocells or au repeaters. We accept inquiries about signal quality not only in homes but also outdoors and in offices and restaurants. In addition, we also deliver equipment in accordance with the usage environment and customer requests.
In fiscal 2022, we proposed measures to improve usage conditions approximately 21,000 by visiting or delivering equipment.
Going forward, we will strive to further improve customer satisfaction with our services so that customers think "I'm glad that I chose au," and expand our service coverage.
Signal Support 24 is available also to customers using UQ mobile and povo.

Approach to Next-Generation High-Speed Communication

The mobile network that supports communication on smartphones and mobile phones has evolved from the first generation (1G) to the fourth generation (4G) together with changes in the times and lifestyle. We conducted research and development of the next-generation mobile communication system "5G" with an aim to provide communications services with greater stability and higher speed to customers and promote dramatic development of ICT network infrastructure, and on March 26, 2020, we launched the "au 5G" service. 5G networks are capable of higher speed and capacity, low latency and many simultaneous connections. By connecting everything via networks, beginning with smartphones and mobile phones, we will continue helping to build Society 5.0 (a creation-based society) as we create new services and solve social problems.
This business strategy is referred to as KDDI's Satellite Growth Strategy in the mid-term management strategy for FY 2022 to 2024. Positioning full-fledged 5G at the core, KDDI will step up its telecommunications business and expand the priority areas around communications, specifically digital transformation (DX), finance, energy, life transformation (LX), and regional co-creation (CATV, etc.).
The key to the success of the Satellite Growth Strategy is 5G communications. Together with diverse partners, KDDI aims for an age of new value emerging from the infusion of communications into every aspect of life.
In expanding 5G coverage, KDDI is currently extending the service area throughout Japan along the community lines to deliver comfortable use to more customers.
Starting from April 13, 2023, we began offering 5G Stand-Alone (SA) services to au customers. 5G SA is a 5G service composed of dedicated 5G technology and infrastructure, including core facilities and base stations." With 5G SA, in addition to high-speed, high-capacity 5G communications, new services will become available in the future, utilizing features like network slicing.
KDDI will further evolve the know-how for optimal operational management of communications platforms and IoT in the coming age where communications permeate every corner of our life. Together with our partners, we will create new value. As a future plan, KDDI aims to offer tailored solutions for each industry using network slicing on the 5G platform and accelerate our corporate customers' digital transformation.

Advancing Research on 5G

With the evolution of devices and the proliferation of IoTs, mobile networks are required to perform at much higher levels than expected before. KDDI will work on demonstration experiments with its partner companies to pursue business opportunities beyond industrial borders and fields of business through the fifth-generation mobile communications system "5G" with high speed, high capacity, low latency, and massive device connectivity.
We will actively roll out 5G services as basic next-generation infrastructure, develop businesses through co-creation with various partner companies, and promote open innovation that incorporates the innovative ideas and advanced technologies of start-ups. In this way, we will create new customer experience and actively utilize 5G services for regional revitalization businesses.
We began conducting 5G stand-alone (5G SA) communication trials in a commercial environment in September 2021 to provide services that leverage the advantages of 5G. In February 2022, we launched service offerings for corporate customers. With the full-scale deployments of 5G SA, the opportunities for providing new value will expand. With network slicing, stable communication tailored to specific use cases becomes possible, and open and virtualization approaches bring evolution to network operations as well. In 2023, we successfully conducted a verification test with broadcast operators, using Service Level Agreement (SLA)-guaranteed network slicing on our 5G SA commercial network to produce digital terrestrial broadcasting programs. In this verification test, we confirmed that it is possible to relay stably with a simplified equipment configuration compared to conventional methods. This is expected to broaden the scope of video production and relay in the future. These technologies will not only further advance towards the full deployment of network slicing but also contribute to the growth of our business with our customers.

Initiatives to Provide 5G SA services

Providing Service Environment outside Japan

Since the establishment of Kokusai Denshin Denwa Co., Ltd. (KDD) in March 1953, we have leveraged partnerships with overseas telecommunications operators that we have cultivated over more than 70 years of providing international telephone services. As a result, we offer Worldwide Data Flat services and voice services in over 160 countries and regions, allowing you to use au smartphones and mobile phones with confidence even when overseas, providing data services at a flat rate.
Starting from February 2020, an early booking discount is applicable to the World Data Flat service when the service is booked in Japan before departure. No prior settings are required when using the service overseas.
KDDI will strive to continue to provide an environment where users can use our communications services securely and comfortably outside Japan.

Safer and More Resilient Connected World