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EVOLUTION OF CELLULAR NETWORKS

 INTRODUCTION 

Mobile wireless communication system has gone through several evolution stages in the past few decades after the introduction of the first generation mobile network in early 1980s. Due to huge demand for more connections worldwide, mobile communication standards advanced rapidly to support more users. Let’s take a look on the evolution stages of wireless technologies for mobile communication.

History Of Wireless Technology

Prior to the advent of cellular technology, there were few mobile telephone systems in the late 1940s such as car-based telephone systems. 

In 1979, the first 1G cellular network was launched in Japan. In 1981, the first international cellular network, Nordic Mobile Telephone (NMT) systems, came to operation in Nordic countries.

In 1983, two other 1G systems, Advanced Mobile Phone System (AMPS) and Total Access Communication System (TACS) were introduced in the US and other European countries including the UK, Italy, respectively.



The push to talk technique was used here. Later, Mobile Telephone System (MTS) and Improved MTS (IMTS) were introduced to support a larger number of mobile stations.

Generation Evolution of Cellular Network


Martin Cooper, an engineer at Motorola during 1970s working on a handheld device capable of two way communication wirelessly, invented the first generation mobile phone. It was initially developed to use in a car, the first prototype was tested in 1974.

This invention is considered as a turning point in wireless communication which led to an evolution of many technologies and standards in future.




1G – First Generation 

The first generation of mobile network was deployed in Japan by Nippon Telephone and Telegraph company (NTT) in Tokyo during 1979. In the beginning of 1980s, it gained popularity in the US, Finland, UK and Europe. This system used analogue signals and it had many disadvantages due to technology limitations.


Most popular 1G system during 1980s

  • Advanced Mobile Phone System (AMPS)
  • Nordic Mobile Phone System (NMTS)
  • Total Access Communication System (TACS)
  • European Total Access Communication System (ETACS)

Key features (technology) of 1G system

  • Frequency 800 MHz and 900 MHz
  • Bandwidth: 10 MHz (666 duplex channels with bandwidth of 30 KHz)
  • Technology: Analogue switching
  • Modulation: Frequency Modulation (FM)
  • Mode of service: voice only
  • Access technique: Frequency Division Multiple Access (FDMA)

Disadvantages of 1G system

  • Poor voice quality due to interference
  • Poor battery life
  • Large sized mobile phones (not convenient to carry)
  • Less security (calls could be decoded using an FM demodulator)
  • Limited number of users and cell coverage
  • Roaming was not possible between similar systems

2G – Second Generation

Second generation of mobile communication system introduced a new digital technology for wireless transmission also known as Global System for Mobile communication (GSM). GSM technology became the base standard for further development in wireless standards later. This standard was capable of supporting up to 14.4 to 64kbps (maximum) data rate which is sufficient for SMS and email services.
Code Division Multiple Access (CDMA) system developed by Qualcomm also introduced and implemented in the mid 1990s. CDMA has more features than GSM in terms of spectral efficiency, number of users and data rate.



Key features of 2G system

  • Digital system (switching)
  • SMS services is possible
  • Roaming is possible
  • Enhanced security
  • Encrypted voice transmission
  • First internet at lower data rate
  • Disadvantages of 2G system
  • Low data rate
  • Limited mobility
  • Less features on mobile devices
  • Limited number of users and hardware capability

2.5G and 2.75G system

In order to support higher data rate, General Packet Radio Service (GPRS) was introduced and successfully deployed. GPRS was capable of data rate up to 171kbps (maximum).
EDGE – Enhanced Data GSM Evolution also developed to improve data rate for GSM networks. EDGE was capable to support up to 473.6kbps (maximum).
Another popular technology CDMA2000 was also introduced to support higher data rate for CDMA networks. This technology has the ability to provide up to 384 kbps data rate (maximum).

3G – Third Generation 

Third generation mobile communication started with the introduction of UMTS – Universal Mobile Terrestrial / Telecommunication Systems. UMTS has the data rate of 384kbps and it support video calling for the first time on mobile devices.
After the introduction of 3G mobile communication system, smart phones became popular across the globe. Specific applications were developed for smartphones which handles multimedia chat, email, video calling, games, social media and healthcare.



Key features of 3G system

  • Higher data rate
  • Video calling
  • Enhanced security, more number of users and coverage
  • Mobile app support
  • Multimedia message support
  • Location tracking and maps
  • Better web browsing
  • TV streaming
  • High quality 3D games

3.5G to 3.75 Systems

In order to enhance data rate in existing 3G networks, another two technology improvements are introduced to network. HSDPA – High Speed Downlink Packet access and HSUPA – High Speed Uplink Packet Access, developed and deployed to the 3G networks. 3.5G network can support up to 2mbps data rate.
3.75 system is an improved version of 3G network with HSPA+ High Speed Packet Access plus. Later this system will evolve into more powerful 3.9G system known as LTE (Long Term Evolution).

Disadvantages of 3G systems

  • Expensive spectrum licenses
  • Costly infrastructure, equipment and implementation
  • Higher bandwidth requirements to support higher data rate
  • Costly mobile devices
  • Compatibility with older generation 2G system and frequency bands

4G – Fourth Generation 

4G systems are enhanced version of 3G networks developed by IEEE, offers higher data rate and capable to handle more advanced multimedia services. LTE and LTE advanced wireless technology used in 4th generation systems. Furthermore, it has compatibility with previous version thus easier deployment and upgrade of LTE and LTE advanced networks are possible.

Simultaneous transmission of voice and data is possible with LTE system which significantly improve data rate. All services including voice services can be transmitted over IP packets. Complex modulation schemes and carrier aggregation is used to multiply uplink / downlink capacity.



Key features of 4G system

  • Much higher data rate up to 1Gbps
  • Enhanced security and mobility
  • Reduced latency for mission critical applications
  • High definition video streaming and gaming
  • Voice over LTE network VoLTE (use IP packets for voice)

Disadvantages of 4G system

  • Expensive hardware and infrastructure
  • Costly spectrum (most countries, frequency bands are too expensive)
  • High end mobile devices compatible with 4G technology required, which is costly
  • Wide deployment and upgrade is time consuming

5G – Fifth generation

5G network is using advanced technologies to deliver ultra fast internet and multimedia experience for customers. Existing LTE advanced networks will transform into supercharged 5G networks in future.

In earlier deployments, 5G network will function in non standalone mode and standalone mode. In non standalone mode both LTE spectrum and 5G-NR spectrum will be used together. Control signaling will be connected to LTE core network in non standalone mode.



Key features of 5G technology

  • Ultra fast mobile internet up to 10Gbps
  • Low latency in milliseconds (significant for mission critical applications)
  • Total cost deduction for data
  • Higher security and reliable network
  • Uses technologies like small cells, beam forming to improve efficiency
  • Forward compatibility network offers further enhancements in future
  • Cloud based infrastructure offers power efficiency, easy maintenance and upgrade of hardware

Summary


Wireless technology has been continuously evolving to meet increasing demands and higher specification requirements. Since the deployment of first generation mobile networks, telecommunication industry facing lot of new challenges in terms of technology, efficient utilization of spectrum and most importantly security to end users. Future wireless technologies will provide ultra fast, feature rich and highly secure mobile networks.

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