best 3G-PPT

8/7/2019 best 3G-PPT

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3G is one of themost recent

transmissiontechnologies. To completelyunderstand the modern

technology, we have toknow what is 3Gstandards and 3Gspectrum.

13G TECHNOLOGY


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Introduction

Features

Applications

Technology history

Concepts involved in 3G:

Simplex vs. Duplex

TDD vs. FDD

Symmetric vs. Asymmetric Transmission

TDMA vs. CDMA

Circuit Switching vs. Packet Switching How 3G network works?

Communication in 3G Networks

High Speed in 3G

Conclusion

2CONTENTS


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The mobile communications industry has evolved in threestages , and correspondingly three generations of mobile

phones have emerged thus far.Each one has provided more flexibility and usability thanthe previous ones.

(1G) Analog

(2G) Digital mobile phone

(3G) Multimedia services

3INTRODUCTION


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1. With 3G, the information is splitinto separate but related packetsbefore being transmitted and

reassembled at the receiving end.2.The World Wide Web(www) is

becoming the primarycommunications interface.

3.Speeds up to 2 Megabits persecond (Mbps) are achievablewith 3G.

4FEATURES


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5APPLICATIONS


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6TECHNOLOGY HISTORY


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Simplex vs. Duplex

TDD vs. FDD Symmetric vs. Asymmetric transmission

TDMA vs. CDMA

Circuit Switching vs. Packet Switching

CONCEPTS INVOLVED IN 3G 7


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SIMPLEX

In this, only one person can communicate at a time. Walkie-Talkie

uses simplex form of communication.

Using a Walkie-Talkie we have to push a button to talk one-way..

8CONCEPTS-SIMPLEX vs. DUPLEX


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DUPLEX

Allows simultaneous two-way communication.

Channel from base station to device is known as downlink and

channel to device is known as uplink.

9CONCEPTS-SIMPLEX vs. DUPLEX


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FDD

In FDD, there are two separate frequency bands : one band for theuplink and one band for the downlink.

The two bands are separated by a guard band which providesisolation of two bands.

10CONCEPTS-FDD vs. TDD


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TDD

In this, the uplink and the

downlink frequency operate on thesame frequency, but they areswitched very rapidly one momentthe channel is sending the uplinksignal, the next moment the channelis sending the downlink signal.

TDD requires a guard time insteadof a guard band between transmitand receive streams.

11CONCEPTS-FDD vs. TDD


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Data Transmission is Symmetric if thedata in the downlink and the data in theuplink is transmitted at the same datarate. Ex-voice transmission.

In Asymmetric Transmission, data in

the downlink and data in the uplink aretransmitted at different data rates. Ex-internet..

12CONCEPTS-SYMMETRIC TRANSMISSION vs. ASYMMETRIC TRANSMISSION


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CIRCUIT SWITCHINGTraditional connections for voice connections require a physical pathconnecting the users at the two ends of the line, and that path staysopen until the conversation ends. This kind of connection is calledcircuit switching.

14CONCEPTS-CIRCUIT SWITCHING vs. PACKET SWITCHING-CIRCUIT SWITCHING


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PACKET SWITCHINGPacket Data:

chopped into pieces(packets).

given a destination address.

mixed from other data from other sources. transmitted over a line with all the other data.

reconstituted at the other end.

15CONCEPTS-CIRCUIT SWITCHING vs. PACKET SWITCHING-PACKET SWITCHING


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16HOW 3G WORKS..?


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TDD mode does not allow long range transmissions.

For this reason, TDD mode can only be used inenvironments where the propagation delay is small.

TDD mode is highly efficient for transmission ofinternet data in Pico cells.

17HOW 3G WORKS..?


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IN PREVIOUS TECHNOLOGIES:

In GSM technology, instead of setting up a dedicated circuit, a smallportion of the airwaves are reserved for our call.

This is a bad way of dividing up the available airwaves because thespaces and pauses in speech may get the same priority as the words.

IN GSM TECHNOLOGY: 3G networks change all this. Instead of reserving airspace eachconversation is chopped up into packets , each one of which is labeledwith a code denoting which dialogue it is from.

18COMMUNICATION IN 3G NETWORKS


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On current GSM networks data chugs around at 9.6kilobits per second(kbps).

By contrast the upper limit for 3G networks is 2megabits per second if you are standing still and 384kbps for those on the move.

This radical change means 3G mobile networks cansupport lots more subscribers and let them downloaddata much faster.

19HIGH SPEED IN 3G


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In 3G networks, using packets of information to carryvoice and data also means that your phone is effectively

always connected to the network. Mobile operators will have to stop charging on thebasis of talk time and move to a model based on thepackets you download or a single charge per monthcovering anything and everything you do.

The day of 3G may be dawning but it will be a longtime before the Sun sets on our existing mobilephones.

20CONCLUSION

best 3G-PPT

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