2009 new presentation on wimax

8/4/2019 2009 New Presentation on Wimax

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WIMAX

Wateen Telecom 0-04-2008


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What is Wimax?

Wimax is Worldwide interoperability for microwave access.

Wimax is IEEE 802.16 standard based technology.

IEEE 802.16 is a standard and does not identify the types of services

that it can support. Services and data speeds are defined by the serviceprovider. What WiMAX does is provide the ability to seamlessly offer anytype of service over a large metropolitan area. Typically these servicesinclude voice over IP (VOIP), data, and streaming video.


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Enables delivery of last mile wireless broadband access

An alternative to wired broadband services like Cable, DSL

Targets two types of user markets: Fixed and Mobile


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World wide subscriber growth for mobile telephony,internet usage and broadband access


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WORKING

Line of Sight (LOS)

Antenna & WiMAX tower in line Stronger & more reliable Supports very high data rates Frequencies reaching up to 66GHz Less interference & lot of bandwidth LOS for Backhauling always

Non Line of Sight (NLOS)

Antennas not in line Small size antennas Indoor & outdoor installed CPEs Low frequency range, 2 11 GHz Less disruption at lower freq. Low data rates as compared to NLOS


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High DataHigh Data

RatesRates

ScalabilityScalability

MobilityMobility

SecuritySecurity

Support for operation in different frequency bands andSupport for operation in different frequency bands and

ChannelizationsChannelizations. Flexible frequency planning; Macro, Micro,. Flexible frequency planning; Macro, Micro,

Pico cell supportPico cell support

QoSQoSTraffic types,Traffic types, QoSQoS with Service Flows, Advanced Schedulingwith Service Flows, Advanced Scheduling

Framework, Adaptive Modulation & Coding, ARQ, HFramework, Adaptive Modulation & Coding, ARQ, H--ARQARQ

EAP authentication, Encryption with AESEAP authentication, Encryption with AES--CCM,CCM,

CMAC Authentication mode, X.509 Certificates, Key Binding,CMAC Authentication mode, X.509 Certificates, Key Binding,

Device and User authentication capabilityDevice and User authentication capability

Secure Optimized Hard Handover,Secure Optimized Hard Handover,

Fast BS Switching Handover,Fast BS Switching Handover,

Power Management with Sleep and Idle modesPower Management with Sleep and Idle modes

OFDM to support higher PHY rates, Larger MAC frames withOFDM to support higher PHY rates, Larger MAC frames withlow overhead, Advanced FEC, Adaptive modulation,low overhead, Advanced FEC, Adaptive modulation,

HH--ARQ, MIMO andARQ, MIMO and BeamformingBeamforming supportsupport

High DataHigh Data

RatesRates

ScalabilityScalability

MobilityMobility

SecuritySecurity







QoSQoSTraffic types,Traffic types, QoSQoS with Service Flows, Advanced Schedulingwith Service Flows, Advanced Scheduling


Traffic types,Traffic types, QoSQoS with Service Flows, Advanced Schedulingwith Service Flows, Advanced Scheduling


















Mobile WiMAX Salient Features


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IEEE 802.16 IEEE 802.16a/ Revd IEEE 802.16e

Completed December 2001 May 2004 Est. Mid-2005

Spectrum 10 - 66 GHz 2 11 GHz 2 - 6GHz

Application Backhaul Wireless DSL andBackhaul

Mobile Internet

Channel Conditions Line of Sight Only Non-Line of Sight Non-Line of Sight

Bit Rate 32 134 Mbps at 28MHz Channelization

Up to 75 Mbps at 20MHz Channelization

Up to 15 Mbps at 5MHz Channelization

Modulation QPSK,16QAM and64QAM

OFDM 256,OFDMA2048

QPSK,16QAM,64QAM

Same as802.16d,Scalable

OFDMA

Channel Bandwiths 20,25 and 28 MHz Selectable ChannelBandwidths Between

1.5 and 20 MHZ

Same as 802.16d


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Standard Type of network Industry Group

IEEE 802.11 Wireless LAN

IEEE 802.15 Wireless PAN

IEEE 802.16 Wireless MAN


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Formation of WiMAX Forum

IEEE developed the technical specs for the 802.16 standard,but left the task for the industry to evolve it into a certifiable andinteroperable solution

and thus, WiMAX Forum was founded in June 2001


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WiMAX Forum

A non profitable organization comprised of

Broadband Wireless Equipment Manufactures Telecom System Integrators

Component Suppliers (Silicon, RF, Antenna, Software) Service Providers (DSL Operators, WISPs)

Their Charter

To certify equipments that conform to the IEEE 802.16 Facilitate the development of WiMAX network

Develop process to certify compatibility andinteroperability of wireless products

Over 200 hundred members of the forum 36 membership processing


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Some WiMAX Forum member Companies:

Presently, more than 520 companies are member of the WiMAX Forum


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Licensed Spectrum for WiMAX DeploymentLicensed 2.5GHz: 2.5GHz and 2.7GHzUS, Canada, Mexico, Brazil, and some southeast Asian countriesbroadband radio services (BRS)195 MHz, allowing FDD and TDD operation

Licensed 2.3GHz:WCS band in US, Australia, South Korea, and New ZealandA major constraint in this spectrum is the tight out-of-band emission

requirements enforced by the FCC to protect the adjacent DARS(digital audio radio services) band (2.320GHz to 2.345GHz)

Licensed 3.5GHz:

Fixed wireless broadband access in several countriesUnited States: FCC has recently allocated 50MHz of spectrum in the

3.65GHz to 3.70GHz band for high-power unlicensed use withrestrictions on transmission Redline Technology Series WiMAX Technologies andSystems Module-1: WiMAX Overview slide 16protocols that precludes WiMAX


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Mobile WiMAX vs 3G Cellular Technologies

WiMAX is designed for broadband services; mobility is an add-on

Cellular tech. are designed for mobility; broadband is add-on feature

Mobile WiMAX has some advantages:

Multipath tolerance (OFDM)

Scalable channel bandwidthWell-refined QoS

Advanced Antenna Technology support


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Where does

WiMAX standamong otherwireless

technologeis?

2x2 MIMO,10MHzchannel

Poor CSMAbased MACresults inmuch lower

throughputs


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Data rates ofvarious cellular

and mobiletechnologies:


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WIMAX NETWORK MODEL

The network reference model envisions a unified network architecture for supporting fixed,

nomadic, and mobile deployments and is based on an IP servicemodel. The overall networkmay be logically divided into three parts:

1-Mobile Stations (MS) used by the end user to access the network

2-The access service network (ASN), which comprises one or more base stations and one

or more ASN gateways that form the radio access network at the edge

3-Connectivity service network (CSN), which provides IP connectivity and all the IP core

network functions.


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NSP

NAP

R1R3

MSS

R2

ASN CSN

ASP Netw ork OR

Internet

R4

Another ASN


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ASN

ASN GW

R6

BS

BS

R8

R1

R3

R4


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CSN and ASN support the delivery and authentication of mobile Wimaxsubscribers.

ASN Gateway sits between Radio and IP network. ASN Gateway is not asimple router as it have a lot of functionalities. The ASN gateway typically

acts as a layer 2 traffic aggregation point within an ASN.

R6 interface is very important as it connects the BS and ASN Gateway.

The CSN is responsible for IP address management, support for roamingbetween different NSPs, location management between ASNs, and mobilityand roaming between ASNs.


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L l f M bilit


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Levels of Mobility .

Portability = Nomadic Mobility

Dynamic Addressing with Dialup and DHCP User chooses the Access Link

Portability + Roaming = Nomadic Server

Mobility Dynamic DNS allows Nomadic node to be

reached

Portability + Roaming + Handover = FullMobility

Cell Phones

Mobility is transparent to the user


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WiMAX Layer Architecture


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Access point

User


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Time Division Duplex

Frequency division Duplex


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TDD-FDD CollocationTDD & FDD systems Collocation on the same

towerNo performance degradation with appropriate

guard bandGuard band depends on:Out-of-band emissions of the transmitters

Performance of transmitter output filterDirectional antenna performance (side lobe

suppression)Polarization

Antenna positioning (space separation andorientation)

Receiver sensitivity


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TDD Vs FDD Comparison: ConclusionsThe FDD/TDD scenario is not essentially different from any

FDD/FDD or TDD/TDD from the point of view of potential intersysteminterference for systems sharing contiguous regions.

Proper frequency planning and azimuth discrimination can be themost effective measurement to solve the potential inter-systeminterference.

Polarization DiversityIf possible, FDD and TDD systems should use different polarizationThe cross polarization isolation is about 10~15dB

Separation SeparationThere should be a minimum of 10 ft separation between antennas

for FDDand TDD systemsThe 10 ft (center to center) separation Redline Technology Series RF

Planning and Link Design for WiMAX Deployment Slide 53

will have a 50dB isolation at2GHz and 56dB at 5GHz and 67dB at 20GHz


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TDD Frame (10-66 GHz)


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TDD Downlink Subframe


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Modulation Scheme

WiMAX employs Adaptive Modulation

Modulation is selected according to SNR in a radio link

Highest modulation scheme used when SS is very close to BS,

giving higher thru puts i.e. 64 QAM Lowest modulation scheme used when SS is farthest away from BS,

giving lowest thru put but maintain connectivity i.e. BPSK

This allows overcoming time selective fading and makes it possible

in NLOS scenario to maintain connectivity & trading off between

the range and the data rate

64QAM, 16QAM, QPSK & BPSK modulation schemes are generally

employed


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CODING AND

MODULATION

Dept of Electronics andCommunication, MBCET

OFDM TRANSMITTER

OFDM RECIEVER


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OFDMA Subchannels

A subset of subcarriers is grouped together to form a subchannel A transmitter is assigned one or more subchannels in DL direction

(16 subchannels are supported in UL in OFDM PHY)Subchannels provide interference averaging benefits for aggressive frequency

reuse systems


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Time Division Duplex (TDD)

Using the TDD method, a single frequency channel is assigned to both thetransmitter and the

receiver. Both the uplink (UL) and downlink (DL) traffic1 use the samefrequency f0 but at different

times (Figure 1).

Figure 1: Spectrum Utilization in TDD

In effect, TDD divides the data stream into frames and, within each frame,assigns different time slots

to the forward and reverse transmissions. This allows both types oftransmissions to share the same

transmission medium (i.e., the same radio frequency), while using only thepart of the bandwidth

required by each type of traffic (Figure 2).

Figure 2: Dynamic Bandwidth Allocation in TDD

1 Proxim Wireless defines UL traffic as traffic going from the Subscriber Unit(SU) to the Base Station Unit

(BSU), and DL traffic as traffic going from the BSU to the SU.


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OFDM Basics

Orthogonal Subcarriers

Cyclic Prefix in Frequency Domain Cyclic Prefix in Time Domain


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OFDM and OFDMA

Dept of Electronics and

Communication, MBCET

Orthogonal Frequency-Division Multiplexing

Single User

Orthogonal Frequency-Division Multiple Access

Multiple User


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Wi-Fi



LAN 802.11g Wi-Fi

Out of Range


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WiMAX Mesh System




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Advantages Over Wifi

Improved Performance

Much Greater Distances

Much Better MAC

LNOS Ability


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Frequency

Originally Working 10 to 66ghz

FDD or TDD.

Now supporting 2 to 11ghz with 802.11a.OFDMA with TDMA access.


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NLOS

Wifi only work on Line of Sight Areas

NON Line Of Sight capability in 2-11ghz.OFDMA.


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Usage Areas

Broadband Internet Access

Voip , IPTV services

Cellular Phones


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Competing Technologies



TechnologySer vices

EVDO3GPP2

HSPA3GPP

Wi-Fi802.11

WiMAX802.16a ,16e

Band Width 1.25 MHz 5 MHz 20 MHz 1.5-20 MHz

Download3.1 or 4.9 Mbps 14Mbps 54Mbps-

100Mbps

9.4 Mbps

Upload 1.2 Mbps 1.4Mbps 20Mbps 3.3, 6.5 Mbps

Modulation QPSK, 8PSK,16 QAM

QPSK

16QAM

BPSK,QPSK

16QAM

QPSK, 16

QAM, 64 QAM

MultipleAccess

TDMCDMA

TDDCDMA

CSMA TDMOFDMA

Range 1-3Miles 1-3Miles 100 Ft -1000Ft 3-5 Miles

Mobility High High Low Medium


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Advanced Antenna TechnologyAdaptive Antenna System (AAS)

Beamforming

Space-Time Coding (STC)

Spacial Multiplexing/MIMO


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Use multiple transmit and multiple receive antennas for a single user

User data streamUser data stream

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MIMO Antenna Configuration

Now this system promises enormous data rates!


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For large bandwidths TDMA and CDMA suffer from inter-symbol-interference inlarger cells

Large bandwidth = small symbol duration

Symbols gets smaller and channel does not change

How to combat frequency selective fading?

parallel orthogonal flat narrowband channels

Orthogonal subcarriers (downlink and uplink), high spectral efficiency

Efficient MIMO implementation

OFDMA is a cost-effectivetechnology for Mobile Internet

Key Radio Technology: OFDMA


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Salient Features of WiMAXOFDM based Physical Layer

Very High Peak Data Rates 10 Mbps at 10 km

Support TDD and FDD

OFDMA Method Used

Robust Security

Support for MobilityIP-Based Architecture

Standardized Network

Conclusion




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Challenges for WiMAX Overcome



Problem Solution

Non Line of Sight Coverage Channel Diversity, Coding

High Data Rate and Capacity OFDM , Adaptive Antennas

Quality of Service Complex MAC layer, IPconvergence

Mobility Seamless Handover, IP

Based Network

Portability Power Efficient Modulation,

Sleep Wake modes

Security Encryption, Authentication,

Access control

Low Cost IP based protocol and Large

Consumer Service


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WATEEN TELECOM

Wateen Telecom, Pakistans largest communication company in the

private sector has become the detrimental catalyst that has rampantlymoved forward the country into a digital revolution with its ability toseamlessly connect and enable smarter, faster, cost-effective andflexible communication solutions to reach its valued customers.

WATEEN VISION

To launch Pakistan into the 21st century digital revolution byproviding complete communication solutions to Telecom Operators,Corporate, Consumers and to be the leading Carriers Carrier by

creating a world-class cutting-edge network to deliver a broad rangeof reliable, affordable and quality customer-centric services.


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WATEEN MISSIONTo provide affordable communication services that meets and exceedscustomers' requirements.

To deliver high-quality, flexible and innovative solutions that are cost

effective and conducive.To provide complete customer satisfaction on time, every time.

WIMAX MOTOROLA SOLUTIONTo provide a level of user experience unmatched by any other carrierin Pakistan,Wateen Telecom chose Motorolas WiMAX and IMS Core

technology to provide wireless broadband voice and data servicesfor residential and corporate use. WithMotorolas global experience

and support, Wateen installed its WiMAX network in 22 major citieswithin just nine months and continue to deploy a network placingWateen as the premier service provider in Pakistan.In June2008,Wateen will provide services upto 100 cities in Pakistan.


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In choosing Motorola, Wateen did not only focus on the technology

and technical expertise of Motorola, we looked at their capability todeliver an end to end service.

( Shahid Miah, CTO Wateen Telecom, March, 2007.)

Wateen and Motorola won NMEI awards fortechnology innovationAt the third annual Network Middle East Innovation Awards held inDubai on April 2, 2007, Wateen was presented an award for best

Wireless Access Network (WAN) implementation as the bestexample of a success ful wide-area networking project in theMiddle East. In addition, Motorola was honored in the BestTelco/Service Provider category for its MOTOwi4 WiMAXtechnology.


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SERVICES OFFER BY WATEENWateen Telecom is the first company in the world to roll-out a WiMAX

network at a country-wide scale. With Wateen's WiMAX network,you get access to:

Broadband Internet with up to 2Mbps dedicated speeds

Telephony with over 40 value added features

Fully secure high-speed data networks

Subscribers can use advanced telephony, surf the Internet at super-fast speeds, make video calls, and watch IP-TV through the comfortand ease afforded by a single connection


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NETWORK DESIGNINPUT BUSINESS

SITE PROPOSING

SURVEYDEPLOYMENT

SIMULATION

2009 new presentation on wimax

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