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Comparative Study of 2G, 3G and 4G

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Sagarkumar B. Patel at Charotar University of Science and Technology
Sagarkumar B. Patel
Vatsal Shah
Vatsal Shah
Vatsal Shah
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Maharshi Kansara at Aalto University
Maharshi Kansara
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1 st generation wireless cellular network was introduced in 1980s, till then different advancement has been made in this direction and different generations were introduced like 2G, 3G, and 4G networks after 1G. Here in this paper, a brief comparison is made between 2G, 3G and 4G networks, how they evolved and its advantages and disadvantages, channel-coding scheme used and the frequency band used in each generation have been discussed in this paper.
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CSEIT1833711 Received : 20 April 2018 | Accepted : 30 April 2018 | March-April-2018 [ (3 ) 3 : 1962-1964 ]
International Journal of Scientific Research in Computer Science, Engineering and Information Technology
© 2018 IJSRCSEIT | Volume 3 | Issue 3 | ISSN : 2456-3307
1962
Comparative Study of 2G, 3G and 4G
Sagarkumar Patel*, Vatsal Shah, Maharshi Kansara
Department of Electronics and Communication, C.S.P.I.T., CHARUSAT, Changa, Gujarat, India
ABSTRACT
1st generation wireless cellular network was introduced in 1980s, till then different advancement has been made
in this direction and different generations were introduced like 2G, 3G, and 4G networks after 1G. Here in this
paper, a brief comparison is made between 2G, 3G and 4G networks, how they evolved and its advantages and
disadvantages, channel-coding scheme used and the frequency band used in each generation have been
discussed in this paper.
Keywords: GSM, EDGE, HSPA, HSPA+, LTE
I. INTRODUCTION
As the need arise, first generation was developed
around 1980s by Nippon Telegraph and Telephone
(NTT) in Tokyo. So, Japan was the first country to
commercialize 1G. 1G is based on analog signals
based on AMPS (Advance Mobile Phone Service).
FDMA (Frequency Division Multiple Access) scheme
of multiplexing was used in 1G.
Due to disadvantages like very less capacity and
analog technology, 2G was introduced in 1990s based
on GSM in Finland. 2G had many advantages like
radio signals in 2G are digital, offered better security
compared to 1G, made better and efficient use of
spectrum available and also had an added facility of
text services. Its improved version also included
GPRS (General Packet Radio Service) which allowed
internet access.
With more number of users using mobile phones to
access internet, a faster and robust internet
connectivity was needed and 3G was introduced. The
concept of CDMA (Code Division Multiple Access)
and WCDMA (Wideband Code division multiple
access) was introduced in 3G. NTT DoCoMo first
commercially launched it in Japan in early 2000s.[1]
3G also had an advantage that it was backward
compatible with present 2G systems.
4G communication system was first introduced in
Finland in 2010. The concept of OFDM (Orthogonal
Frequency division multiplexing) is used in 4G. The
internet speed in 4G can reach upto 100 Mbps due to
which applications that requires very high speed like
online gaming, high definition video streaming and
interactive TV can be enjoyed.
II. 2G
2G is based on GSM (Global System for Mobile
Communication) technology. 2G system used
combination of TDMA (Time Division Multiple
Access) and FDMA (Frequency Division Multiple
Access). Due to this more users were able to connect
at a time in a given frequency band.
Figure 1. Multiple Access
Volume 3, Issue 3 | March-April-2018 | http:// ijsrcseit.com
Sagarkumar Patel et al. Int J S Res CSE & IT. 2018 Mar-Apr;3(3) : 1962-1964
1963
As shown in the figure, a specific frequency slot is
divided into time slots, so multiple user can use a
specific frequency slot. The GSM system uses 25 Mhz
frequency spectrum in a 900Mhz band. A speed of
around 14.4 Kbps is obtained in basic 2G network.
The core network used in 2G is PSTN (Public
Switched Telephone Network). Circuit switching is
used in GSM.
As the need to send data on air interface increased,
GPRS (General Packet Radio Service) was clubbed
with existing GSM network. Due to this optimal
speed upto 150Kbps can be reached. Still, as the need
arise to increase the data rate, EDGE (Enhanced Data
GSM Environment) was introduced, which increased
the amount of data rata four fold times.[2] It was also
feasible to make an upgrade on current GPRS system.
EDGE can also be considered 2.5G.
III. 3G
3G system uses CDMA (Code Division Multiple
Access) and WCDMA (Wide Band Code Division
Multiple Access). CDMA is a technique in which a
unique code is assigned to each user using the
channel at that time. After assigning a unique code,
completely available bandwidth is utilized efficiently
in it. Due to this very large number of users can use
the channel at the same time compared to TDMA
and FDMA.
Figure 2 . CDMA Technique
As shown in figure, a unique code is assigned to each
user due to which N number of channels can be
formed at a time. 3G uses 15 Mhz to 20 Mhz
frequency spectrum and the frequency band for 3G is
from 1800 Mhz to 2500 Mhz. A maximum speed of
around 2 Mbps is achieved in basic 3G system.
WCDMA also known as UMTS (Universal Mobile
Telecommunication System) uses much larger career
frequency due to which more amount of users can be
accommodated at compared to CDMA.[3] The core
network used in 3G systems is combination of Circuit
switching and Packet switching.
To further increase the speed of data, HSPA and
HSPA+ (High Speed Packet Access) was introduced.
Due to HSPA+ networks can be upgraded to run at
broadband speeds. The concept of MIMO (Multiple
Input Multiple Output) was first introduced in
HSPA+. Due to this data rates can reach to as high as
42 Mbps.[4] HSPA and HSPA+ can be considered as
3.5G and 3.75G respectively. The modulation
technique used in HSPA+ was 64-bit QAM.
MIMO is a method in which concept of Multipath
propagation is used to improve the radio link. Same
signal are received multiple times on receiver side.
Due to this, the probability of error is decreased and
overall performance is improved.
Figure 3. General Outline of MIMO System
Another advantage in 3G system is of Hand-off. In
this, user equipment is connected to two towers
simultaneously due to which call drop don’t take
place during hand-off.
Volume 3, Issue 3 | March-April-2018 | http:// ijsrcseit.com
Sagarkumar Patel et al. Int J S Res CSE & IT. 2018 Mar-Apr;3(3) : 1962-1964
1964
IV. 4G
LTE (Long Term Evolution) is a 4G mobile
communication standard based on GSM/EDGE and
UMTS/HSPA technologies. LTE uses Multi carrier
CDMA or OFDM (Orthogonal Frequency Division
Multiplexing). In OFDM, high data rate modulating
stream is divided and then placed onto many slowly
modulated narrowband closed-spaced subcarriers.
The frequency band used in 4G is from 2000 Mhz to
8000 Mhz and uses a frequency spectrum of 5Mhz to
20 Mhz. A maximum downlink speed of around 100
Mbps and uplink speed of around 50 Mbps is
achieved in LTE systems. Due to such a high data
rate, it can support bandwidth hungry applications
like online gaming, live streaming of high definition
video, voice over IP.
Figure 4 . OFDM Spectrum
The core network type used in 4G is IP based. 4G
network has very low latencies, has a wider channel
and carrier aggregation upto 100Mhz.
The two common modes of LTE are LTE FDD and
LTE TDD.
Figure 5. Two common modes of LTE
V. CONCLUSION
Last decade saw a huge advancement in field of
wireless communication and especially in the field of
cellular networks. Though 4G has been deployed in
many countries, but still 3G technology is most
widespread. Still it will take some years to
completely migrate to 4G systems and work has
already begun towards 5G technologies and its
challenges.
VI. REFERENCES
[1]. E. Ezhilarasan and M. Dinakaran,'A review on
mobile technologies: 3G, 4G and 5G'. 2017.
Second International Conference on Recent
Trends and Challenges in Computational Models.
ISBN: 978-1-5090-4799-4.
[2]. Sapna Shukla, Varsha Khare, Shubhanshi Garg,
Paramanand Sharma,'Comperative Study of 1G,
2G, 3G, 4G. 2013. Journal of Engineering
Computers and Appied Science, Volume 2, No. 4,
April 2013. ISSN: 2319-5606.
[3]. Qualcomm,'The evaluation of Mobile
Technologies: 1G, 2G, 3G, 4G LTE'. June 2014.
[4]. www.gsma.com
[5]. K. Kumaravel.'Comparative Study of 3G and 4G
in Mobile Technology'. 2011. International
Journal of Computer Science Issues, Volume 8,
Issue 5, No 3, September 2011, ISSN 1694-0814.
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Comperative Study of 1G, 2G, 3G, 4G
  • Apr 2013
  • 2319-5606
  • Sapna Shukla
  • Varsha Khare
  • Shubhanshi Garg
  • Paramanand Sharma
Sapna Shukla, Varsha Khare, Shubhanshi Garg, Paramanand Sharma,'Comperative Study of 1G, 2G, 3G, 4G. 2013. Journal of Engineering Computers and Appied Science, Volume 2, No. 4, April 2013. ISSN: 2319-5606.
The evaluation of Mobile Technologies: 1G, 2G, 3G, 4G LTE'
  • Jun 2014
  • Qualcomm
Qualcomm,'The evaluation of Mobile Technologies: 1G, 2G, 3G, 4G LTE'. June 2014.
Comparative Study of 3G and 4G in Mobile Technology
  • Sep 2011
  • K Kumaravel
K. Kumaravel.'Comparative Study of 3G and 4G in Mobile Technology'. 2011. International Journal of Computer Science Issues, Volume 8, Issue 5, No 3, September 2011, ISSN 1694-0814.