Lecture 2 evolution of mobile cellular

1. Mobile & Ad Hoc Network
Chandra Prakash
Assistant Professor
LPU
1Chandra Prakash, LPU

2. Objectives of the Chapter
Introduction
Fundamentals of Wireless Communication Technology
The Electromagnetic Spectrum
Radio Propagation Mechanisms
Characteristics of the Wireless Channel
Evolution of mobile Cellular Networks
Generations of Cellular Mobile Communication
GSM, GPRS,CDMA ,PCS, UMTS
Wireless LANs, Wi-Fi
IEEE 802 Networking Standard
2 Chandra Prakash, LPU

3. Evolution of mobile
Cellular Networks

4. It all started like this
•First telephone (photophone) –Alexander Bell, 1880
•First radio communication system –G. Marconi(1897)
•The first car mounted radio telephone –1921

5. Going further
•1946 –First commercial mobile radio-telephone service by Bell and
AT&T in Saint Louis, USA. Half duplex (PTT)
–Push-to-talk cellular calls provide half-duplex communications
while one person transmits, the other(s) receive. This combines
the operational advantages of PTT with the interference
resistance and other virtues of mobile phones.
•1973 –First handheld cellular phone –Motorola.
•First cellular net Bahrein 1978

6. Introduction to cellular network
Acellular network
Radionetwork distributed over land areas called cells,
Each cell served by at least one fixed locationtransceiverknown
as acell siteor Base Station(BS).
When joined together these cells provide radio coverage over a
wide geographic area.
Enables a large number of portable transceivers (e.g.,mobile
phones,pagers, etc.) to communicate with each other and with fixed
transceivers and telephones anywhere in the network, via base
stations, even if some of the transceivers are moving through more
than one cell during transmission.

7. Cellular Network

8. Cellular Network

9. Some Cellular Terminology
Cell-serviceareadividedintosmallareaknownascell
•Mobilestation(MS)-Deviceusedtocommunicateoverthecellular
network.
•Basestationtransceiver(BST)-Transmitter/receiverusedtotransmit/
receivesignalsovertheradiointerfacesectionofthenetwork.
•Basestationcontroller(BSC)-Controlscommunicationbetweena
groupofBST'sandasingleMSC.
•Mobileswitchingcentre(MSC)-Theheartofthenetwork,setsupand
maintainscallsmadeoverthenetwork.
•Publicswitchedtelephonenetwork(PSTN)-Thelandbasedsectionof
thenetwork.
•Handoff/Handover:handoverorhandoffreferstotheprocessof
transferringanongoingcallordatasessionfromonechannelconnected
tothecorenetworktoanother.Handoffdecisionmadebasedonsignal
strength.

10. Why Cellular ?
Cellular networks offer a number of advantages over alternative
solutions:
•Wireless access (very convenient)
•Access from anywhere within the coverage area.
•Reduced power use:
•Low power radio (hence better portability and more talk-time per battery
charge)
•―Spectral efficiency‖ (more users in a limited frequency band) through
frequency reuse:
•increased capacity
•larger coverage area
•reduced interference from other signals

11. Cellular principles
In acellular radiosystem, a land area to be supplied with radio service is
divided into regular shaped cells, which can be hexagonal, square, circular
or some other irregular shapes, although hexagonal cells are conventional.
Each of these cells is assigned multiple frequencies (f1-f6) which have
correspondingradio base stations.
Example of frequency reuse factor or pattern 1/4
The group of frequencies can be reused in other cells, provided that the
same frequencies are not reused in adjacent neighbouring cells as that would
causeco-channel interference. This increasedthe capacityin a cellular
network.

12. Cont…
•In a standard FDMA system, there must be at least a one cell gap between
cells which reuse the same frequency.
•The frequency reuse factor is the rate at which the same frequency can be
used in the network.
•It is1/KwhereKis the number of cells which cannot use the same
frequencies for transmission. Common values for the frequency reuse
factor are 1/3, 1/4, 1/7, 1/9 and 1/12 (or 3, 4, 7, 9 and 12 depending on
notation).

13. Generations of Cellular Mobile
Communication
Cellular mobile communication has generations:
–Generation (0)
–Generation # 1
–Generation #2
–Generation #2.5
–Generation #3
–Generation #4

14. Generation 0 (0g)
•RadioTelephone-1945
•Notofficiallycategorizedasmobilephones,sincetheydidnot
supporttheautomaticchangeofchannelfrequencyduringcalls,
whichallowstheusertomovefromonecell(thebasestation
coveragearea)toanothercell,afeaturecalled"handover".
•TechnologiesusedinprecellularsystemsincludedthePushto
Talk(PTTormanual),MobileTelephoneSystem(MTS),Improved
MobileTelephoneService(IMTS),andAdvancedMobileTelephone
System(AMTS)systems.

15. First generation (1G)
Radio signals that 1G networks use are analog [routines for sending
voice] ,
Mostly telephony only:
Virtually no data capability other than special device with analog
modem.
In 1G network, voice calls were simply modulated to a higher
frequency,typically to 150MHz and up.
No International roaming
All systems are incompatible
Little capacity –cannot accommodate masses of subscribers
This generation is now mostly obsolete.

16. First Generation Technology
•1G system deployed in US and canada was known as AMPS.
•Advanced Mobile Phone System (AMPS)
–AMPS is an analog cellular phone system using FDMA.
–A total of 40MHz of spectrum was allocated from the 800MHz band by the Federal
Communications Commission (FCC) for AMPS.
–It was first deployed in Chicago, with a service area of 2100 square miles .
–AMPSoffered832fullduplexchannels,withadatarateof10kbps.
–AlthoughomnidirectionalantennaswereusedintheearlierAMPSimplementation,itwas
realizedthatusingdirectionalantennaswouldyieldbettercellreuse.
–A7-cellreusepatternwasadoptedforAMPS.
–Designedforgradeofservice(GoS)of2%blocking.
•InEurope,TACS(TotalAccessCommunicationsSystem)wasintroduced
with1000channelsandadatarateof8kbps.
•AMPSandTACSusethefrequencymodulation(FM)techniqueforradio
transmission

17. Second Generation (2G)
•A new design was introduced into the mobile switching center of second-
generation systems.
•The use of base station controllers (BSCs) lightens the load placed on the
MSC (mobile switching center) found in first-generation systems
•In addition to enhancements in MSC design, the mobile-assisted handoff
mechanism was introduced .
•In 2G, voice communications were digitallyencrypted.
•Allowed enhanced data services
–The data capability includes Internet access and picture sharing.
•Support some limited data communications, such as Fax and short
messaging service (SMS)

18. Second Generation (2G)
•Increased capacity
•More security
•Compatibility
Compared to first-generation systems, second-generation (2G) systems
use digital multiple access technology
Multiple access technology,
TDMA (time division multiple access) and
CDMA (code division multiple access).
Global System for Mobile Communications, or GSM ,uses TDMA
technology to support multiple users

19. Examples of 2G
•A 2G system is called personal communications services (PCS) in
marketing literature.
•Global System for Mobile (GSM) used in Europe ,
•Cordless Telephone
•Personal Access Communications Systems (PACS),
•Digital European Cordless Telephone (DECT),
•IS-36 used in US.
•Personal Digital communication (PDC) in Japan.

20. Global System for Mobile (GSM)

21. What is GSM
Global System for Mobile (GSM) is a second generation
cellular standard developed to cater voice services and
data delivery using digital modulation
More than 800 million end users in 212 countries (Asia,
Africa, Europe, Australia, America, India etc..)and
representing over 70% of today's digital wireless market.
source: GSM Association

22. •Developed by Group Spéciale Mobile in1982
Aim : to replace the incompatible analog system
•Presently the responsibility of GSM standardization resides with special mobile
group under ETSI ( European telecommunication Standards Institute )
•Under ETSI, GSM is named as ― Global System for Mobile communication‖
•Phase I of GSM specifications was published in 1990
•Commercial service started in mid-1991
•More than 1300 million subscribers in world and 45 million subscriber in India.
•GSM technology was the first one to help establish international roaming.
This enabled the mobile subscribers to use their mobile phone connections in
many different countries of the world’s is based on digital signals ,unlike 1G
technologies which were used to transfer analogue signals.
GSM Since Beginning

23. GSM
GSM in World
GSM in IndiaFigures: March, 2005
37%
1%
4%
43%
4%
3%
3%
3% (INDIA)
3%
Arab World
Asia Pacific
Africa
East Central Asia
Europe
Russia
India
North America
South America Figures: March 2005
Bharti
27%
BSNL
22%
Spice
4%
IDEA
13%
Hutch
19%
BPL
6%
Aircel
4%
Reliance
3%
MTNL
2%
Bharti
BSNL
Hutch
IDEA
BPL
Aircel
Spice
Reliance
MTNL

24. GSM in India

25. Advantages of GSM over Analog system
Capacity increases
Reduced RF transmission power and longer battery life.
International roaming capability.
Better security against fraud (through terminal validation and user
authentication).
Encryption capability for information security and privacy.
Compatibility with ISDN,leading to wider range of services
Integrated Services Digital Network(ISDN) is a set of
communications standards for simultaneousdigitaltransmissionof voice,
video, data, and other network services over the traditional circuits of
thepublic switched telephone network(PSTN).

26. Advantages
Uses radio frequency efficiently, Due to digital radio path it is more
tolerable to disturbance.
Speech quality much better than analog system
Data transmission is supported throughout the GSM system
Speech is encrypted and subscriber information security is
guaranteed.
GSM uses TDMA technology to support multiple users.

27. GSM Services (3 Types)
Tele-services :
Telecommunication services that enable voice communication via mobile
phones
Offered services
Mobile telephony
Emergency calling
Bearer or Data Services
Include various data services for information transfer between GSM and
other networks like PSTN[Public switched telephone n/w.], ISDN
[Integrated services digital n/w] etc at rates from 300 to 9600 bps
Short Message Service (SMS)
up to 160 character alphanumeric data transmission to/from the mobile
terminal
Voice mailbox
Electronic mail

28. GSM Services
SUPPLIMENTRY SERVICES
Call related services :
•Call Waiting-Notification of an incoming call while on the
handset
•Call Hold-Put a caller on hold to take another call
•Call Barring-All calls, outgoing calls, or incoming calls
•Call Forwarding-Calls can be sent to various numbers defined
by the user

29. Architecture of GSM Network Structure
GSM System Architecture-I
Mobile Station (MS)
Mobile Equipment (ME)
Subscriber Identity Module (SIM)
Base Station Subsystem (BSS)
Base Transceiver Station (BTS)
Base Station Controller (BSC)
Network Switching Subsystem(NSS)
Mobile Switching Center (MSC)
Home Location Register (HLR)
Visitor Location Register (VLR)
Authentication Center (AUC)
Equipment Identity Register (EIR)
•PSTN: Public switched telephone
network(telephone lines,fiber optic
cables,microwave transmissionlinks,cellular
networks,communications satellites)
•ISDN: Integrated Services Digital Network
(digitaltransmissionof voice, video, data, and
other network services)

30. TERMINOLOGIES:
•BTS: Base Transceiver Stations (Cell Site)
•MSC: Mobile Switching Center
•HLR: Home Location Register
•VLR: Visiting Location Register
•EIR: Equipment Identity Register
•IMSI(International Mobile Subscriber Identity) -> stored in SIM
(Subscriber Identity Mobile)
•AUC: Authentication Centre

31. TheGateway Mobile Switching Centre(GMSC) is a special kind ofMSC that is
used to route calls outside the mobile network. Whenever a call for a mobile
subscriber comes from outside the mobile network, or the subscriber wants to
make a call to somebody outside the mobile network the call is routed through the
GMSC.

32. GSM System Architecture-I
1. Mobile Station (MS)
1.1 Mobile Equipment (ME)
1.2 Subscriber Identity Module (SIM)
2. Base Station Subsystem (BSS)
2.1 Base Transceiver Station (BTS)
2.2 Base Station Controller (BSC)
3. Network Switching Subsystem(NSS)
3.1 Mobile Switching Center (MSC)
3.2 Home Location Register (HLR)
3.3 Visitor Location Register (VLR)
3.4 Authentication Center (AUC)
3.5 Equipment Identity Register (EIR)

33. System Architecture
1. Mobile Station (MS)
1.1MobileEquipment(ME)
Portable,vehiclemounted,
handhelddevice
Uniquelyidentifiedbyan
IMEI(InternationalMobile
EquipmentIdentity)
Voiceanddatatransmission
Monitoringpowerandsignal
qualityofsurroundingcells
foroptimumhandover
Powerlevel:0.8W–20W
160characterlongSMS.
1.2 Subscriber Identity Module
(SIM)
Smart card contains the
International Mobile Subscriber
Identity (IMSI)
Allows user to send and receive
calls and receive other subscribed
services
Encoded network identification
details -Key Ki,Kcand A3,A5 and
A8 algorithms
Protected by a password or PIN
Can be moved from phone to
phone –contains key information
to activate the phone

34. System Architecture
2. Base Station Subsystem (BSS)
2.1 Base Transceiver Station
(BTS):
Encodes,encrypts,multiplexes,
modulates and feeds the RF
signals to the antenna.
Frequency hopping
Communicates with Mobile
station and BSC
Consists of Transceivers (TRX)
units
2.2 Base Station Controller
(BSC)
Manages Radio resources for
BTS
Assigns Frequency and time
slots for all MS’s in its area
Handles call set up
Transcodingand rate
adaptation functionality
Handover for each MS
Radio Power control
It communicates with MSC
and BTS

35. System Architecture
3. Network Switching Subsystem(NSS)
3.1 Mobile Switching Center
(MSC)
Heart of the network
Manages communication between GSM
and other networks
Call setup function and basic switching
Call routing
Billing information and collection
Mobility management
-Registration
-Location Updating
-Inter BSS and inter MSC call handoff
MSC does gateway function while its
customer roams to other network by
using HLR/VLR.
3.2 Home Location
Registers (HLR)
permanent database about
mobile subscribers in a large
service area(generally one per
GSM network operator)
database contains
IMSI,MSISDN,prepaid/postp
aid,roaming
restrictions,supplementary
services.

36. System Architecture
3.Network Switching Subsystem
3.3 Visitor Location Registers
(VLR)
Temporary database which
updates whenever new MS
enters its area, by HLR database
Controls those mobiles roaming
in its area
Reduces number of queries to
HLR
Database contains
IMSI,TMSI,MSISDN,MSRN,Loc
ation Area,authentication key
3.4 Authentication Center
(AUC)
Protects against intruders in
air interface
Maintains authentication keys
and algorithms and provides
security triplets (
RAND,SRES,Kc)
Generally associated with
HLR

37. System Architecture
3.Network Switching Subsystem
3.5 Equipment Identity Register (EIR)
Database that is used to track handsets using the IMEI (International
Mobile Equipment Identity)
Only one EIR per PLMN (public land mobile network)

38. GSM Specifications-1
GSM 900
Mobile to BTS (uplink): 890-915 MHz
BTS to Mobile(downlink):935-960 MHz
Bandwidth : 2* 25 MHz
GSM 1800
Mobile to BTS (uplink): 1710-1785 MHz
BTS to Mobile(downlink) 1805-1880 Mhz
Bandwidth : 2* 75 MHz
GSM 1900
GSM450

39. Security in GSM
On air interface, GSM uses encryption and TMSI instead of IMSI.
SIM is provided 4-8 digit PIN to validate the ownership of SIM
3 algorithms are specified :
-A3 algorithm for authentication
-A5 algorithm for encryption
-A8 algorithm for key generation

40. Personal Communication System

41. Cellular System vs. Personal Communication
System/Network (PCS/PCN)
Personal Communication Services [PCS] is a system, very similar to
Cellular Phone Service with great emphasis on personal services
(such as Paging, Caller ID, and E-mail) and mobility
PCS can be defined in a broader sense as a set of capabilities that
allows some combination of personal mobility and service
management.
Originated in UK, to improve its competitiveness in the field

42. PCS
PCS has smaller Cell size, therefore, requires more infra-structure
PCS works in 1.85-1.99 GHz band
PCS uses TDMA Technology but with 200 KHz Channel
Bandwidth with eight time-slots[as compared to 30 KHz and 3
time-slots used by Digital Cellular Phone System IS-54/IS-136]
SeveralPCSsystemshavebeendevelopedtomeetrapidgrowthprompted
bymarketdemand.MostofthemareconnectedtoPublicSwitched
TelephoneNetwork(PSTN)tointegratewiththewiredservice.
TwoofthemostpopularPCSsystemsare:
Cellulartelephony
Cordlessandlow-tierPCStelephony

43. Personal communications services (PCSs)
PCS/PCN:
PCS calls for more personalized services whereas PCN refers to
Wireless Networking Concept-any person, anywhere, anytime
can make a call using PC.
PCS and PCN terms are sometime used interchangeably. In
Europe, the term "personal communication networks (PCNs)" is
used instead of PCS.
Form objectives for third-generation wireless
PCS handsets low power, small and light
Provide a limited range & mobility within Urban Centers

44. Personal Communication System (PCS)
Asystemwherewiredandwirelessnetworksareintegratedfor
establishingcommunication.PSTN:Public Switched Network.
MSC:Mobile Switching Center. Also called MTSO
(Mobile Telephone Switching Office).
BS: Base Station.
MS: Mobile Station. Also called MU (Mobile Unit)
or Mobile Host (MH).
HLR:Home Location Register.
VLR:Visitor Location Register.
EIR:Equipment Identify Register.
AC: Access Chanel.
PSTN
BS
VLR
HLR
EIR
AC
MSC (MTSO)MSC (MTSO)
MSMS
Wireless component

45. 2.5 G Mobile Systems
•The move into the 2.5G world will begin with General Packet Radio
Service (GPRS).
GPRS is a radio technology for GSM networks that adds packet-
switching protocols with
–shorter setup time for ISP connections,
–and the possibility to charge by the amount of data sent, rather
than connection time.
•Packet switching is a technique whereby the information (voice or data) to
be sent is broken up into packets, of at most a few Kbytes each, which are then
routed by the network between different destinations based on addressing data
within each packet.

46. 2.5 G
•The next generation of data heading towards third generation and personal
multimedia environments builds on GPRSand is known as Enhanced
Data rate for GSM Evolution(EDGE).
•2.75Gwas the name given to the evolution of EDGE(Enhanced Data
rates for GSM Evolution) or Enhanced GPRS (EGPRS).
•EDGE allow GSM operators to use existing GSM radio bands to
offer wireless multimedia IP-based services and applications at
theoretical maximum speeds of 384 kbps with a bit-rate of 48 kbps per
timeslot and up to 69.2 kbps per timeslot in good radio conditions.
Implementing EDGE will be relatively painless as it will require relatively
small changes to network hardware and software as it uses the same
TDMA frame structure, logic channel and 200 kHz carrier bandwidth as
today's GSM networks.
As EDGE progresses to coexistence with 3G wideband -CDMA, data rates
of up to ATM like speeds of 2 Mbps could be available.

47. General Packet Radio Service (GPRS)

48. Constraints with existing network… WHY
GPRS?
Data Rates too slow –about 9.6 kbps
Connection setup time too long
Inefficient resource utilization for bursty traffic
Proves expensive for bursty traffic utilization
No efficient method for packet transfers

49. GPRS
General Packet Radio Service:-Radio technology that adds
packet-switching protocols
GPRS is a step towards 3G and is often referred to as 2.5G
GPRS support flexible data transmission rates than GSM as well as
continuous connection to the network.
It works on TDMA & CDMA technology, depending upon the
multiplexing used.
Short for General Packet Radio Service, a standard for
wireless communications which runs at speeds up to 115 kilobits
per second, compared with current GSM (Global System for
Mobile Communications) systems’ 9.6 kilobits.

50. Cont…
GPRS, which supports a wide range of bandwidths, is an efficient
use of limited bandwidth and is particularly suited for sending and
receiving small bursts of data, such as e-mail and Web browsing, as
well as large volumes of data.
It consists of a packet wireless access network and an IP-based
backbone. GPRS is designed to transmit small amounts of
frequently sent data or large amounts of infrequently sent data.
GPRS has been seen as an evolution toward UMTS (Universal
Mobile Telecommunications Systems). Users can access IP services
via GPRS/GSM networks.

51. Comparison of GSM & GPRS
GSM GPRS
Data Rates 9.6 Kbps 14.4 to 115.2 Kbps
Modulation Technique GMSK
(Gaussian Minimum Shift Keying)
GMSK
(Gaussian Minimum Shift
Keying)
Billing Duration of connection Amount of data
transferred
Type of Connection Circuit –Switched Technology Packet -Switched
Technology

52. Benefits of GPRS
New Data Services
High Speed (Data Rate 14.4 –115 kbps)
Efficient use of radio bandwidth
Circuit switching & Packet Switching can be used in
parallel
Constant connectivity

53. General Packet Radio Service (GPRS)
SGSN:AServingGPRSSupportNodeisresponsibleforthedeliveryofdatapacketsfrom
andtothemobilestationswithinitsgeographicalservicearea.
GGSN:GatewayGPRSSupportNodeisresponsiblefortheinterworkingbetweenthe
GPRSnetworkandexternalpacketswitchednetworks,liketheInternetandX.25networks.

54. ARCHITECTURE
GPRS services include both point-to-point and point-to-multipoint
communications
GPRS Architecture is same as GSM except few hardware
modifications :
GPRS includes GSNs
SGSN : Serving GPRS Support Node
GGSN : Gateway GPRS Support Node
GPRS Register

55. SGSN(Serving GPRS Support Node)
Delivers data packets to mobile stations & vice-versa
Detect and Register new GPRS MS in its serving area
Packet Routing, Transfer & Mobility Management
Authentication, Maintaining user profiles
Its location register stores location info. & user profiles

56. GGSN –Gateway GPRS Support Node
Interfaces GPRS backbone network & external packet data networks.
The Gateway GPRS Support Node is the ―last port of call‖ in the GPRS
network before a connection between an ISP or corporate network’s
router occurs.
The GGSN is basically a gateway, router and firewall rolled into one.

57. GPRS in INDIA
BPL Mobile
Bharti Cellular
Hutchison Max
Hutchison Essar
Idea Cellular

58. GPRS characteristics
GPRS uses packet switched resource allocation
•resources allocated only when data is to be sent/received
•Flexible channel allocation
•one to eight time slots
•available resources shared by active users
•up and down link channels reserved separately
•GPRS and circuit switched GSM services can use same
time slots alternatively
Traffic characteristics suitable for GPRS
•Intermittent, burstydata transmissions
•Frequent transmissions of small volumes of data
•Infrequent transmission of larger volumes of data

59. Enhanced Data rates for GSM
Evolution(EDGE)

60. (Enhanced Data rates for GSM
Evolution)
Referred as Enhanced GPRS or EGPRS
Inherits all features from GSM and GPRS.
Only difference is instead of binary (Gaussian minimum-shift keying)GMSK ,
it uses 8-PSK modulation (Phase-shift keying )which triple the capacity
compared to GSM.
EDGE is considered a pre-3G radio technology
EDGE requires no hardware or software changes to be made in GSM core
networks. EDGE-compatible transceiver units must be installed and the base
station subsystem needs to be upgraded to support EDGE.
8-PSK is more susceptible to errors than GMSK, thus have 9 different
modulation and coding schemes, each designed for different quality control.

61. Third Generation (3G)
3Gor3rd generation mobile telecommunicationsis a generation of
standards formobile phonesandmobile Telecommunicationservices
fulfilling theInternational Mobile Telecommunications-2000 (IMT-
2000)specifications by theInternational Telecommunication Union.
Application services include wide-area wireless voicetelephone,mobile
Internetaccess,video callsandmobile TV, all in a mobile environment.
3G:voice (circuit-switched) & data (packet-switched)
Third generation offers multi-media communication capabilities, at
higher bit rates, with improved spectrum efficiency.
The EDGE standard is the development of GSM towards 3G.

62. Third Generation Technology (3G)
Digital system with multimedia services including video phone and
relatively higher speed (say up to 1 Mbps) Internet access.
Permanent web connection upto 2Mbps
Internet, phone and media: 3 in 1
Wideband code division multiple access (W-CDMA) and UMTS are some
of 3G standard.
The standard based on GSM is called UMTS.
Universal Mobile Telecommunications System (UMTS)is athird
generationmobile cellular technology for networks based on
theGSMstandard.
3G has just been launched in India and is available on select mobile
operators for select cities. But to access these services, a 3G compatible
mobile phone is required.

63. 3G
3G used completely different radio frequencies from 2G,
so it required different equipment to achieve the new high data
transfer rates.
Enormous costs of additional spectrum licensing fees delayed the
introduction of 3G in many countries.
3G data transfer rates are 384kbits/s to 2Mbits/s, so it allows for
previously unavailable services like video calls, video
conferencing,online conference call, mobile TV, online gaming etc.

64. Universal Mobile Telecommunication
System

65. (Universal Mobile Telecommunication
System)
The Universal Mobile Telecommunications System (UMTS)
is commonly referred to as a third-generation system.
It was targeted to be deployed in 2002.
UMTS employs an ATM-based switching network
architecture and aims to provide services for both mobile and
fixed subscribers by common call-processing procedures.
Full packet driven architecture
For voice and for data transmissions.
Packet based networks allow for an increased amount of traffic on a
medium.

66. The UMTS architecture is split into 3 networks :
1.Core (switching) networks:
oThe core network is responsible for performing switching
and transmission functions
2.Control (service) networks:
oThe control network supports roaming through the
presence of mobility management functions
3.Radio Access networks.
oprovides channel access to mobile users and performs radio
resource management and signalling
UMTS will include both terrestrial and global satellite
components.
Universal Mobile Telecommunication System

67. UMTS
Offers voice and data services the same as EDGE
Services offered will be classed into one of the following
ConversationalStreaming Interactive Background
Real-Time Best-effort, guarantee of quality
delivery
Voice Streaming
Video
Web Pages MMS, SMS,
emails
UMTS
(Universal Mobile Telecommunication System)

68. UMTS
(Universal Mobile Telecommunication System)
3G is also known as UMTS (Universal Mobile
Telecommunication System)
UMTS uses Wideband-Code Division Multiple Access (W-CDMA)
Also known as “IMT-2000 Direct Spread”
Modulation is done with Quadrature phase shift keying (QPSK)
This encodes 2 bits with each change
Supports two modes of operation
Frequency Division Duplex (FDD)
Time Division Duplex (TDD)

69. UMTS
(Universal Mobile Telecommunication System)
The UMTS network comprises:
(a)the mobile terminal,
(b)the base transceiver station (BTS),
(c)the cell site switch (CSS),
(d)mobile service control points (MSCP), and
(e)the UMTS mobility service (UMS).
UMTS employs a hierarchical cell structure, with macrocells
overlaying microcells and picocells.
Highly mobile traffic is operated on the macrocells to reduce the
number of handoffs required.
UMTS aims to support roaming across different networks.

70. 3G UMTS
Types of Cells and Base station to use them
Macro Cell
These cover a large area and will give slow access
144 Kbps –max speed of 500 Km/h
Micro Cell
These should cover a medium area
384 Kbps max speed 120 Km/h
Pico Cell
Less than 100 metres
2 Mbps –max speed of 10 Km/h
Difficult to predict
Actual distances and bandwidth depend on local conditions

71. Cell Splitting

72. 3G UMTS
Types of Cells and Base station to use them
Cells will operate in a hierarchy overlaying each other
Satellite
Macro-Cell
Micro-Cell
Urban
In-Building
Pico-Cell
Global
Suburban

73. GSM Evolution to UMTS

74. Telecommunications
•Mobility
•Circuit switching services
•Packet switching services
UMTS
Internet
•Internet access
•E-mail
•Real-time images transfer
•Multimedia documents transfer
Contents
•Video on-demand
•Interactive video services
•Radio and television
•Entertainment services
•Location based services
Convergence of media, data & telecom

75. Node B
UTRAN
UMTS Basic Architecture Release 99
GMSC
HLR
PSTN/ISDN
BTS
GSM BSS
RNC
BSC
MSC/VL
R
SGSN
Circuit Domain
Packet Domain
INTRANETS
GGSN
Other PLMN
INTERNET
Radio Access Network Core Network
MS
UE
ME
ME
UniversalTerrestrialRadioAccessNetwork,
Radio Network Controller

76. Cont…
UMTS is also designed to offer data rate on-demand.
The network will react to a user's needs, based on his/her profile and
current resource availability in the network. UMTS supports the
virtual home environment (VHE) concept, where a personal
mobile user will continue to experience a consistent set of services even
if he/she roams from his/her home network to other UMTS operators.
VHE supports a consistent working environment regardless of a user's
location or mode of access.
UMTS will also support adaptation of requirements due to different data
rate availability under different environments, so that users can continue
to use their communication services.

77. Fourth Generation
The next step in wireless communications.
A 4G system will be able to provide a comprehensive IP solution
where voice, data and streamed multimedia can be given to users
on an "Anytime, Anywhere" basis, and at higher data rates than
previous generations.
4G mobile phonesare all set to provide data transfer rates of
100Mbit/s to 1Gbit/s,
Digital system with voice over-IP (VOIP) technology. That is, the services
are integrated into all IP network.

78. What is 4G?
•Fourth Generation Technology
–Faster and more reliable
–100 Mb/s
–Lower cost than previous generations
–Multi-standard wireless system
–Bluetooth, Wired, Wireless
–Ad Hoc Networking
–IPv6 Core
–OFDM used instead of CDMA
–Potentially IEEE standard 802.11n
–Most information is proprietary

79. Fourth Generation Technology
One of the main ways in which 4G differed technologically from 3G was
in its elimination ofcircuit switching, instead employing an all-IP
network.
4G ushered in a treatment of voice calls just like any other type of
streaming audio media, utilizing packet switching
overinternet,LANorWANnetworks viaVoIP.
Concept of Global Village

81. Generation Wireless Networks

84. Type of Networks
By Network Formation and Architecture
•Infrastructure-based network.
•Infrastructureless (ad hoc) network.
By Communication Coverage Area.
1.Wireless Wide Area Networks (Wireless WANs)
•Infrastructure-based networks
•Connections can be made over large geographical areas, across cities or even
countries
•Use of multiple antenna sites or satellite systems maintained by wireless service
providers.
•Examples :Cellular networks (like GSM networks or CDMA networks) and satellite
networks
87Chandra Prakash, LPU

85. Type of Networks
2.Wireless Metropolitan Area Networks (Wireless MANs).
–Referred as fixed wireless , infrastructure-based networks
–Enable users to establish broadband wireless connections among multiple locations ,for
example, among multiple office buildings in a city or on a university campus
–Serve as backups for wired networks
–Radio waves and infrared lightcan be used to transmit data.
3.Wireless Local Area Network (Wireless LANs)
–Enable users to establish wireless connections within a local area with in a 100 m range
–Provide flexible data communication systems that can be used in temporary offices or
other spaces that can operate in infrastructure-based or in ad hoc mode
–Include 802.11 (Wi-Fi) and Hiperlan2
4.Wireless Personal Area Networks (Wireless PANs).
–Enable users to establish ad hoc, wireless communication among personal wireless
devices such as PDAs, cellular phones, or laptops that are used within a personal
operating space, typically up to a 10 meter range.
–Two key Wireless PAN technologies are
•Bluetooth: is a cable-replacement technology that uses radio waves to transmit data
to a distance of up to 9–10 m,
•Infrared: connect devices within a 1 m range.
88Chandra Prakash, LPU

86. IEEE 802 Networking Standard

87. IEEE 802 Networking Standard
•we need to have set of rules/standards for the data to travel
from one computer to other computer.
•Its developed by IEEE (Institute of Electrical and Electronics
Engineers, Inc.)
•The number 802 was simply the next free number IEEE could
assign,though ―802‖ is sometimes associated with the date the first
meeting was held —February 1980.
•The standards such as IEEE 802 helps industry provide advantages
such as, interoperability, low product cost, and easy to manage
standards.
•IEEE standards deal with only Local Area Networks (LAN) and
Metropolitan Area Networks (MAN).

88. IEEE 802 Networking Standard

89. IEEE 802.11
•IEEE 802.11is a set of standards for implementingwireless local
area network(WLAN) computer communication in the 2.4,3.6and
5GHz frequency bands. They are created and maintained by
theIEEELAN/MAN Standards Committee (IEEE 802)
•802.11 specifies an over-the-air interface between a wireless
client and a base station or between two wireless clients. The
IEEE accepted the specification in 1997.

90. IEEE 802.11
Thereareseveralspecificationsinthe802.11family:
•802.11—appliestowirelessLANsandprovides1or2Mbpstransmissionin
the2.4GHzbandusingeitherfrequencyhoppingspreadspectrum(FHSS)or
directsequencespreadspectrum(DSSS).
•802.11a—anextensionto802.11thatappliestowirelessLANsandprovides
upto54-Mbpsinthe5GHzband.802.11ausesanorthogonalfrequency
divisionmultiplexingencodingschemeratherthanFHSSorDSSS.
•802.11b(alsoreferredtoas802.11HighRateorWi-Fi)—createdastandard
ofwirelessLANoperationsin2.4GHzindustrial,scientificandmedical
(ISM)Band,whichisfreelyavailableforusethroughouttheworld.This
standardknownasWi-Fi(Wireless-Fidelity).Itcanofferdataratesofup-to
11MBPS.

91. •802.11e— awirelessdraftstandardthatdefines
theQualityofService(QoS)supportforLANs,andisanenhancementto
the802.11aand802.11bwirelessLAN(WLAN)specifications.802.11e
addsQoSfeaturesandmultimediasupporttotheexistingIEEE802.11b
andIEEE802.11awirelessstandards,whilemaintainingfullbackward
compatibilitywiththesestandards.
•802.11g—appliestowirelessLANsandisusedfortransmissionover
shortdistancesatupto54-Mbpsinthe2.4GHzbands.
•802.11n—802.11nbuildsuponprevious802.11standardsbyadding
multiple-inputmultiple-output(MIMO).Therealspeedwouldbe100
Mbit/s(even250Mbit/sinPHYlevel),andsoupto4-5timesfasterthan
802.11g.
•802.1X—Nottobeconfusedwith802.11x(whichisthetermusedto
describethefamilyof802.11standards)802.1XisanIEEEstandardfor
port-basedNetworkAccessControlthatallowsnetworkadministratorsto
restricteduseofIEEE802LANserviceaccesspointstosecure
communicationbetweenauthenticatedandauthorizeddevices.