Deployment of Broad Band WMAN Using Wi-Max Standards

8/14/2019 Deployment of Broad Band WMAN Using Wi-Max Standards

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Deployment of Broad Band

WMAN using Wi-maxStandards

Dr. (Mrs.)Nupur PrakashProfessor, School of Information TechnologyGGS Indraprastha University,

Delhi, INDIA


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Wireless Networks

Facilitate

Freedom from wires

All pervasive computing

Access to network resourcesanywhere anytime

Higher productivity and connectivity


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Mobile Network Architecture & Standards

lWireless NetworksWPAN

WLAN

WMAN

lStandardizationIEEE 802.15

IEEE 802.11IEEE 802.16

WMAN

WLAN

WPAN


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Features of Wireless Networks

WPAN WLAN WMANProtocol 802.15 802.11 802.16

Standards Bluetooth,

IrDA, UWD

Wi-fi Wi-Max

FrequencyRange

2.4 to 2.483Ghz

5.15 to5.35Ghz

10 Ghz to 66Ghz

Speed .1- 4 Mbps 1-54 Mbps 2-70 Mbps

Cell radius 1-10 ms 1-500 ms 1km-50km

Modulation FHSS OFDM, DSSS QPSK


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WiMax Technology

lWiMax (Worldwide Interoperability formicrowave access)A technology based on an evolving standard

for point-to-multipoint wireless networkingMedium range wireless data communication

standard (IEEE 802.16)

Solution for Wireless Metropolitan Area

Network (WMAN)

BWA (Broadband Wireless Access) Solution


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What is WiMax?

lOperates onfrequenciesbetween 10-66GHz

l1 to 10 mile range (10miles assumingrural areas with littleblockages).

l70MB/second transferrate

Image copyright Intel (2004)


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Broadband Fixed wireless accessarchitecture

lSupportsP-MP configuration

Hub uses broad coverage antenna mounted

on towers or tall building and transmits to agroup of subscribers

Subscriber uses highly directional antennapointed towards the hub


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Broadband wireless access systemarchitecture using WiMAX Standards


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WiMax Forum

lWiMax was Founded in Jan 03

lNo Profit organization comprised ofwireless access system manufacturers

component suppliers

software developers and carriers.

lPromotes conformance, compliance and

interoperabilitylWiMax Forum certified product


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WiMAX Forum

Initial Founding Members (2003)

WiMAX Members *

Fujitsu OFDM Forum

Hughes Network Systems France Telecom

Intel Tata Teleservices PCCW Alcatel

Reliance Infocom Atheros

China Motion Telecom British TelecomAlvarion Qwest

Proxim Aperto Networks

Siemens ZTE

* Partial List
http://www.wilan.com/first.htmhttp://www.nokia.com/indexhttp://www.ensemble.com/index3.asp


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WiMAX Standard for WMAN

The IEEE 802.16 standard

ldefines a powerful OFDM and NLOS technologyfor wireless metropolitan area network

(WMAN)lprovides broadband wireless connectivity to

Fixed, Portable and Nomadic users.

lcan be used to backhaul LANs to the Internet

lprovides inter-campus connectivity and awireless alternative to cable, DSL, T1s oreven fiber or cable

l


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WiMax Features

lprovides up to 50-kilometers of service arearange

lallows users to get broadband connectivity

without needing direct LOS with the basestation

lsingle base station simultaneously supports

hundreds of businesses with T1/E1-typeconnectivity

thousands of homes with DSL-type connectivity


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Benefits of Broadband Wireless Access

lVery cost effective to deploy to ruralcommunities and businesses, where terrain orsituation do not allow traditional cabling orsatellite connectivity

lResolve traditional Last Mile customers reachissues and enhance broadband services torural, low density communities.broadband in-fill for DSL black-spots

adding capacity to mobile & line networkslBroadband and Internet access in underserved,

developing communities.

l


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IEEE 802.16 Versions

l802.16a uses the licensed and license-exempt frequencies from 2 to

11Ghz Supports Mesh-Network

l802.16b Increases spectrum to 5 and 6GHz Provide QoS (for real-time voice and video service)

l802.16c Represents a 10 to 66GHz system profile

l802.16d

Improvement and fixes for 802.16al802.16e

Addresses on Mobile Enable high-speed signal handoffs necessary for

communications with users moving at vehicular speeds


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The family of 802.16 standard


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Deployment of Wi-Max

Wi-Max deployment is planned in three phases.

lPhase one: Hubs with outdoor antennas that targetknown subscribers in a fixed location leading to quickinexpensive solution without laying cable.

lPhase two:will roll out indoor antennas making

installation simpler at user sites leading to simple, lowcost installation of fixed wireless access.

lPhase three:will launch IEEE 802.16e Wi-Max certified

hardware available in portable solutions supportingroaming of users within a service area. WiMaxcompatible PDAs and laptops are expected to belaunched by 2007

l


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Infrastructure required for WMAN

using Wi-Max

lBase Stations

lSubscribers ModuleSend/Receive Antenna

Receiver/Transmitter

Router connected to Server via cable or802.11 hot-spot

lThe backhaul unit


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Wireless Broadband Communities


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WiMax Protocol stack

MAC Convergence Sublayer

(ATM, Ethernet. 802.1Q, IP)

MAC

MAC Privacy Sublayer

Physical Layer

ATMEthernet, 802.1QInternet Protocol

Packing,FragmentationARQ, QoS

Authentication,Key Exchange

Privacy(encryption)

OFDM, RangingPower Control,DFS, Tx, Rx


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Physical Layer

lPoint-to-multipoint architecture,lBS transmits a TDM signal, with individual

subscriber stations allocated time slotsserially.

lburst single-carrier modulation (OFDM) withadaptive burst profiling transmissionparameters, including the modulation andcoding schemes, adjusted individually to eachsubscriber station (SS) on a frame-by-frame

basis.lChannel bandwidths of 20 or 25 MHz (typical

U.S. allocation) or 28 MHz (typical Europeanallocation) are specified


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Frame Structure and PDU

lEach MAC packet consists of the threecomponents,A MAC header, which contains frame control

information.A variable length frame body, which contains

information specific to the frame type.

A frame check sequence (FCS), which

contains an IEEE 32-bit cyclic redundancycode (CRC).


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Security Mechanism

The IEEE 802.16 protocol supports securitymechanism for terminal authentication andprivacy. Each connection is mapped to a

Security Association (SA) that specifieslthe encryption algorithm to be used

lthe data authentication algorithm to beused and

lthe algorithm for exchanging the dataencryption keys.


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Security Implementation

lAuthentication is based on the use of PKItechnology-based X.509 digital certificates.

lEach Subscriber Station (SS) contains both amanufacturer-issued factory-installed X.509

digital certificate and the certificate of themanufacturer.

lPrivacy Sublayer uses privacy protocol that isbased on the privacy key exchangemanagement (PKM) protocol

lPKM protocol uses X.509 digital certificates withRSA public key encryption for SSauthentication and authorization keyexchange.


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Wireless Roaming

lThe 802.16e task group is working ondeveloping a specification to enable802.16 mobile clients

lPDAs using embedded chips or laptopsusing 802.16e enabled cards

lThese clients will be able to handoff

between 802.16 base stations, enablingusers to roam between service areas.


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Hand-off Procedure

lRoaming and hand offs betweenheterogeneous 802 networks is beingstudied

lHand off procedures would allowmobile devices to switch the

connection from one base station toanother

from one 802 network type to another(such as from 802.11 to 802.16)

from wired 802.x to 802.16,

connections.


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Seam less Roaming

lAs the mobile client (a notebook or a PDA user)moves within WMAN it remains connected viaEthernet or 802.11 when docked and staysconnected with 802.16 when roaming the cityor suburbs

lThe goal is to standardize handoffs betweenheterogeneous networks and support seam

less roaming. The mobile devices thusbecome interoperable as they move from onenetwork type to another.

l


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Broadband Wireless Access

l802.16e


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Expected players

lBacked by 140companies in theWiMax Forum(www.wimaxforum.org)

l Intel is producing chipsand currentlymanaging 50 test sitesaround the country

lCovad (currently a bigDSL provider) isconsidering usingWiMax for last mileconnections.

l


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Adoption of Broadband Wireless atAhmedabad Rural District, INDIA

Multistoried Bldg.

Civil Hospital

District Inds. Center

Superintendent

Of PoliceOffice

High Court

Ahd.Diet

Dist. Court

Krushi Bhavan

Jal Bhavan

Sales Tax

Karai

Blk.12

Circuit House

CP Office

Collector

RTO Jail

GMDC


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Gujarat StateGujarat State

Govt BB WirelessGovt BB Wireless

WAN ProjectWAN Project


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WiMAXs Path to future BroadbandMobility

T I M E

Satellite Network

Telephone Network

Internet

IP Based Access Network

Wi-FiBase Station

802.16

-2004B

ackh

aul

Pedestrian Speeds, 11Mbps,Lightweight, Limited Coverage

802.16-2004Base Station

8 0 2

. 16

-20

0 4

B a

c k

ha

u l

Vehicular Speeds, 20 Mbps, PowerSource, Heavy, Limited Coverage,Specialized Applications

802.16d/eBase Station

802.16-2004Backhaul

Vehicular Speeds, 20 Mbps,Lightweight, Full Coverage


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Thank You

Documents

Deployment of Broad Band WMAN Using Wi-Max Standards