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5
WIRELESS SYSTEM
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CONTENTS
A BRIEF VIEW
WHAT IS 4G????
3G VS 4G
OBJECTIVE OF 4G IP V6 SUPPORTS
BENEFITS OF 4G
CONCLUSION
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Generation refers change in nature of Service compatible
transmission technology and new frequency bands.
1G systems used analog frequency modulation.
2G systems use digital communication techniques with
TDM, FDM, CDMA.
3G systems offer higher data rates and voice and paging
services to provide interactive multimedia includingteleconferencing and internet access.
4G aims to provide IP telephony, ultra-broadband Internet
access, gaming services.
A BRIEF VIEW
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WHAT IS 4G ???
4G refers to the fourth generation of cellular wireless standards
4G is a packet switched wireless system with wide area coverage andhigh throughput.
4G wireless uses OFDM and millimeter wireless that enables data rateof 20 mbps and frequency band of 2-8 GHz.
4G is going to be a packed based network.
4G provide an end-to-end IP solution where voice and data is goingto be served to users.
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3G Vs 4G
The following table shows comparisons between
3G and possible 4G systems.
3G 4G
Frequency Band 1.8 - 2.5 GHz 2 - 8 GHz
Bandwidth 5-20 MHz 5-20 MHzData rate Up to 2Mbps Up to 20 Mbps
Access Wideband CDMA Multi-carrier -
CDMA or
OFDM(TDMA)
Switching Circuit/Packet
Packet
Mobile top speeds 200 kmph 200 kmph
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OBJECTIVES OF 4G
4G being developed to accommodate QoS rate
requirements set by further development of existing
3G applications.
Flexible channel bandwidth between 5 and 20MHz,optionally up to 40MHz.
Data rate of at list 100Mb/s between any two points
in the world.
Increase system spectral efficiency of up to
3bit/s/Hz/cell in the downlink and 2.25bit/s/Hz/cell
for indoor usage.
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IPv6 SUPPORT
Unlike 3G, based on two parallel infrastructure circuit
switched and packet switched network nodes, 4G will be
based on packet switching only. This will require low-
latency data transmission.
IPv6 support large number of wireless enabled devices.
By increasing the number of IP addresses, IPv6 removes
the need for NAT (Network Address Translation).
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BENEFITS OF 4G
High speed, high capacity, and low cost per bit.
Support interactive multimedia, voice, streaming
video, Internet, and other broadband services.
Global access, service portability, and scalablemobile services.
Better scheduling and call admission control
techniques. Smooth handoff across heterogeneous networks.
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BENEFITS OF 4G
High quality of service for next generation
multimedia support (real time audio, high speed
data, HDTV video content, mobile TV, etc.)
Interoperability with existing wireless standards.
In addition to improvements in the multiplexing
systems, improved modulation techniques are
being used. Whereas earlier standards largelyused Phase-shift keying, more efficient systems
such as QAM are being proposed for use with
the 3GPP Long Term Evolution standards.
http://en.wikipedia.org/wiki/QAMhttp://en.wikipedia.org/wiki/QAM8/2/2019 4g Seminar Presentation
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CONCLUSION
Migration to 4G networks ensuresconvergence of networks, technologies,applications and services.
4G can serve as a flexible platform. Wireless carriers have an opportunity to
shorten Investment return, improve operatingefficiency and increase revenues.
4G - a promising Generation of wirelesscommunication that will change peoples lives.
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