In this blog post, we’ll examine the evolution of mobile communication technology and the role of electrical and electronic engineering, and explore how this technology has transformed our daily lives.
Mr. S wakes up to the sound of an alarm on his smartphone and eats breakfast while reading the news on a newspaper app. On his way to school, he pays his bus fare with his smartphone, and while on the bus, he reads the news feed on social media. As he heads to the classroom, he checks class announcements through the school app before entering the lecture hall. After class, he wraps up his day by using social media to make dinner plans with friends.
Everyone would agree that the advancement of mobile communications has had a tremendous impact on our lives. Thanks to these advancements, the mobile networks formed by individuals have expanded significantly, bringing about major changes not only in technology but also across the political, economic, social, and cultural spheres. It has become easy to stay in touch anytime, anywhere, and organizing social gatherings or making plans has become much more convenient. With just a single cell phone, we can participate in various gatherings and appointments, making interactions between people much simpler than before. In this way, the advancement of mobile communications has greatly reduced the constraints of space and time, creating an environment where we can communicate easily and conveniently anytime, anywhere. Today, smartphones have become an indispensable part of daily life for South Koreans, as seen in Mr. S’s example.
Communication technology, one of the fields most closely related to electrical and electronic engineering, is utilized in every aspect of our daily lives today. Once people learn that electrical and electronic engineering is the foundational technology behind the smartphone—this innovative device—they naturally become interested in the field. So, what exactly is electrical and electronic engineering? To understand this, we must first examine the concept of engineering itself, of which electrical and electronic engineering is a part. Engineering is an applied science that develops technologies based on the principles and achievements of the natural sciences and applies them to industry and everyday life. In other words, it is a technical science that applies the foundational disciplines of the natural sciences to practical life. Among the various fields of engineering, electrical and electronic engineering has an exceptionally broad scope of research. Therefore, rather than merely defining the discipline, it is more helpful to examine the representative fields studied by electrical and electronic engineering and their development processes. Here, we will focus on the evolution of communication technology and the resulting changes in daily life. In particular, we will examine second- and third-generation mobile communication technologies, which brought about significant changes in everyday life during the development of mobile communications.
Mobile communication technology has evolved through several generations in line with changes in key technologies. Early mobile phones struggled to resolve the issue of other people’s voices or background noise being heard during calls. This was caused by radio wave interference resulting from overlapping frequency bands used by different devices. To address this problem, second-generation (2G) mobile communication, which utilizes digital technology, was introduced. Digital technology represents information using discrete values rather than continuous ones. For example, since digital systems use only 0s and 1s to represent information, even if a signal is slightly altered by external interference, it can be restored to its original value and recognized. Thanks to this, the system became more resistant to noise and enabled more accurate communication; data transmission efficiency also improved significantly, making it possible to transmit not only voice but also various types of data.
Second-generation mobile communications introduced multiple access methods to allow more users to communicate simultaneously while minimizing interference. While analog mobile communications used the Frequency Division Multiple Access (FDMA) method, which divides frequencies, digital mobile communications utilized Time Division Multiple Access (TDMA) and Code Division Multiple Access (CDMA).
The TDMA (Time Division Multiple Access) method allows multiple users to share a single frequency by dividing time into very short intervals and sequentially allocating them to each user. Each user transmits data only during their allocated time slot, and because this process repeats at a very high speed, it effectively feels as though communication is occurring simultaneously. This method enabled multiple users to efficiently share a single frequency.
The Code Division Multiple Access (CDMA) system is a technology that represents a further advancement beyond the existing methods of dividing time and frequency. Although all users share the same time slot and frequency, their signals are distinguished using unique codes. Consequently, even when multiple users communicate simultaneously, their signals do not interfere with one another. Since it allows for more efficient use of the frequency spectrum than FDMA and TDMA, it played a major role in the advancement of mobile communication technology.
Third-generation (3G) mobile communications is a technology developed as an advancement from second-generation (2G) mobile communications—which focused primarily on voice and low-speed data services—to support high-speed data, including Internet access, and various multimedia services. The International Telecommunication Union (ITU) promoted the standardization of this next-generation mobile communication technology, and subsequently, 3G mobile communication services were fully commercialized in countries around the world. In South Korea as well, the era of mobile internet began in earnest in the early 2000s with the introduction of 3G services, including the WCDMA standard.
3G significantly improved data transmission speeds compared to previous mobile communication systems and, based on international standards, made cross-border roaming services much more convenient. While there are several standard technologies for 3G mobile communications, one of the most widely used globally is WCDMA (Wideband Code Division Multiple Access).
WCDMA is an advanced version of the CDMA technology used in 2G mobile communications. By utilizing a wide frequency band, it significantly increased data transmission speeds, enabling stable access to various multimedia services such as watching videos, downloading music, and making video calls. These technological advancements laid a crucial foundation for the dawn of the smartphone era.
The most significant change brought about by the evolution of mobile communication systems is the widespread adoption of data services. Whereas voice calls were previously the core of mobile communication services, the subsequent introduction of a structure that provides data services independently has made a wide range of digital services possible. As a result, various services—such as video streaming, high-quality voice services, and mobile internet—that were previously difficult to provide have rapidly become part of everyday life.
Representative services include standard voice services and high-quality voice services, as well as high-speed data services, text messaging, video search services, still and video content services, web and email, file transfer, and remote access services. Furthermore, with the emergence of various mobility-based services—such as location-based services, short message service (SMS), and navigation services—mobile communications have evolved beyond a simple means of communication into a comprehensive information and communications platform.
As communication technology advances and its achievements accumulate, our lives become increasingly convenient. Communication technology is one of the representative fields of electrical and electronic engineering, and various other fields are also significantly transforming our lives. So, what other fields are studied in electrical and electronic engineering besides communications? To understand this, we first need to examine what electrical and electronic engineering is as a discipline.
Electrical and electronic engineering is a field that studies various technologies designed to make our daily lives more convenient and comfortable. It conducts broad-ranging research on everything from the various home appliances we use in our daily lives to office automation and factory automation systems—which reduce labor and costs while increasing productivity—as well as the fundamental theories, design, manufacturing, and operational technologies of computers and information and communication systems, which are at the core of modern information culture. Furthermore, the production, transmission, and distribution of electrical energy, along with technologies for the efficient use of electricity, are also important areas of research.
Today, engineering and industry are inextricably linked. In particular, the electrical and electronic industry is a prime example of a high-tech, high-value-added sector and a core field driving technological innovation. Electrical and electronic engineering lies at the heart of future industries such as information technology (IT), artificial intelligence (AI), semiconductors, next-generation communications, power systems, and robotics; these technologies serve as the key driving force behind the development of modern industry and society as a whole.
As illustrated by the examples discussed earlier, research in electrical and electronic engineering has led to the development of mobile communication technology, which in turn gave rise to the smartphone, while advancements in power technology have resulted in the establishment of stable power transmission and distribution networks. Furthermore, display technology has advanced televisions and monitors, and semiconductor technology has enabled the core components of cutting-edge electronic devices. Beyond these, electrical and electronic engineering plays a pivotal role even in fields that may appear to have little direct connection at first glance, such as robotics, computer systems, autonomous driving, and the renewable energy industry. In a narrow sense, electrical and electronic engineering is an academic discipline that studies technologies in the fields of electricity, electronics, communications, and semiconductors; however, in a broader sense, it can be described as a core engineering field that underpins modern industry as a whole.
The career paths available to students majoring in electrical and electronic engineering are also extremely diverse. Graduates are actively entering not only advanced manufacturing sectors such as semiconductors, displays, electronic devices, and telecommunications equipment but also the power and energy industries, engineering, construction, automotive, aerospace, medical devices, robotics, software, and artificial intelligence. They also apply their expertise in various fields, including corporate R&D departments, national research institutes, government-funded research institutions, public agencies, universities, and research laboratories.
Recently, as the convergence of technologies has accelerated, electrical and electronic engineering has been collaborating closely with other disciplines such as neuroscience, life sciences, biomedical engineering, and environmental engineering. This is because the importance of interdisciplinary research is growing as the number of problems that cannot be solved by a single technology increases. Moving forward, electrical and electronic engineering technologies will continue to expand their scope of application alongside the development of future industries, including artificial intelligence, next-generation mobile communications (5G and 6G), semiconductors, eco-friendly energy, and quantum technology. As industry and civilization continue to advance, the role and importance of scientists and engineers in the field of electrical and electronic engineering are expected to grow even further.
