DR. C. V. RAMAN UNIVERSITY KARGI ROAD KOTA BILASPUR (C.G.)

2014-15

WiMAX Transreceiver

Presentation On:

INTRODUCTION

WiMAX:“Worldwide Interoperability for Microwave Access” supports point to multi-point (PMP) broadband wireless access.

WiMAX is basically a new shorthand term for IEEE Standard 802.16.

The IEEE wireless standard has a range of up to 30 miles or 50 kilometers.

WiMAX COVERAGE

WiMAX coverage is approximately 40 Mbit/s and is going to touch 1 Gbit/s for fixed users in the near future.

Similarly, fixed users can access WiMAX and it ranges 50 km or 30 miles.

The case for the mobile user is different. It could not go to that extent as stationary customers.

For mobile users the WiMax coverage is 5-15 km or 3-10 miles.

EVOLUTION OF IEEE 802.16 STANDARDS

• Evolution of IEEE family of standard for BWA

The standard provides secification for PHY and MAC layer

IEEE 802.16-2001

ᴥ fixed BWA access in a point-to-point (PTP) topology.ᴥ Single carrier modulationᴥ 10-66 GHz frequency rangeᴥ Connection oriented

6

EVOLUTION contd.. IEEE 802.16a

ᴥ Added physical layer support for 2-11 GHzᴥ NLOS operation becomes possibleᴥ OFDM included as an alternative to single carrier modulation

IEEE 802.16-2004

ᴥ 2-11 GHZ frequency rangeᴥ 256 subcarriers OFDM Techniqueᴥ Fixed and Nomadic access

IEEE 802.16e

ᴥ Scalable OFDMAᴥ Mobile BWA

WAN IEEE 802.16eIMT-2000(3G)(Nationwide)

MANIEEE 802.16-2004

ETSI HiperMAN/WiMAX(50 Km)

LANIEEE 802.11 (a,b,g)

(150 m)

PANIEEE 802.15Bluetooth

(10m)

TYPICAL NETWORK RANGES

Wide Area Network

Metropolitan Area Network

Local Area Network

Personal Area Network

SCOPE OF 802.16 STANDARDS

SAP: Service Access PointPDU: Protocol Data Unit

Accept, perform classification, process higher PDUsDeliver CS PDU to MAC SAPReceive CS PDUs from the peer entity

System access, bandwidth allocationconnection establishment, connection maintenance

Authentication, security key exchange, encryption

IEEE Std 802.16 protocol layering

Multiple specifications each appropriate to frequency range (ex: 802.16.1 10-66GHz up to 134Mbit/s) and application

IEEE 802.16 SPECIFICATIONS IEEE 802.16 Protocol Stack

MAC Layer Service specific convergence Sublayer(CS)

-MAC CS receives higher level data -provides transformation and mapping into MAC SDU-ATM CS and packet CS

MAC Common Part Sublayer (CPS) - System access, bandwidth allocation, connection management-QoS provisioning

Privacy Sublayer-Authentication, secure key exchange, encryption

PHY Layer-Four different physical layer specifications-SC, SCa, OFDM, OFDMA

Service-Specific Convergence Sublayer (CS)

MAC Common Part Sublayer (MAC CPS)

Security Sublayer

Physical Layer (PHY)

CS SAP

PHY SAP

MAC SAP

Data /Control Plane

PHY

MAC

Scope of standard

Management Entity

Service Specific CS

Management Entity

MAC CPS

Security Sublayer

Management EntityPHY

Management Plane

IEEE 802.16 SPECIFICATIONS Cont. .

Network Architecture and Deployment Topology

Architecture Resembled to cellular networks Each cell consists of a BS and one or

more SS BS provides connectivity to core network

Topology Point to point (PTP) Point to multi point (PTM) Mesh

BS

SSsBS

SSs

BS

SSs

Core Network

WiMAX

WiMAX

WiMAX

ISP PoP

Wi-Fi Hotspots

WiMAX PTP backhaul

WIMAX POINT-TO-POINT BACKHAUL

ISP PoPWire line or Wireless backhaul

WiMAX Base Station

WiMAX point-to-multipoint

Homes with outdoor/indoorWiMAX receiver

POINT TO MULTIPOI

NT APPLICAT

ION

RELATIONSHIP WITH OTHER WIRELESS TECHNOLOGIES3G Mobile-Fi Wi-Fi WiMAX

Max. Speed 2 Mbps 16 Mbps 54 Mbps 100 Mbps

Coverage Several Miles Several Miles 300 feet 50 miles

Airwave Licensed Licensed Unlicensed Either

Advantages Range, Mobility

Speed, Mobility

Speed, Price Speed, Range

Disadvantages

Slow, Expensive

High Price Short Range Interference issues

ADVANTAGES & SECURITY ISSUES

•HIGH SPEED •COVERAGE•MULTI-FUNCTIONALITY• FLEXIBLE INFRASTRUCTURE•MESH TOPOLOGY

•SECURITY:1 .DES (Data Encryption Standard) or AES (Advanced Encryption Standard) 2. PKM ( Privacy Key Management) protocol

DRAWBACKS • Line-of-Sight is required for long distance (5-30 mile) connections.• Heavy rains can disrupt the service.

• Other wireless electronics in the vicinity can interfere with the WiMAX connection and cause a reduction in data throughput or even a total disconnect.• Network complex security issue.• Not many areas have 4G service yet.

APPLICATIONS

Cellular Backhaul- hotspots, PTP back haul

Residential Broadband-fill the gaps in cable and dsl coverage

Underserved Areas-rural areas

Always Best Connected- roaming

SYSTEM FOR 802.16 WIMAX

CONCLUSION WiMAX will no doubt be a viable alternative to DSL and cable connections. There more than 150 commercial trials WiMAX network deployments have taken place worldwide.

In January 2006, Samsung revealed its WiMAX enabled M8000 handset, which connects directly to WiMAX base stations through 802.16e. It will have stiff competition with already establish broadband access technology (DSL & cable modem). WiMAX is the future of ‘WBA technology’.

FUTURE SCOPE

• There are some good reasons for 4G development and a variety of current and evolving technologies to make WiMAX a reality.

FUTURE SCOPE

• MBWA is a technology developed by IEEE 802.20 for true WBA or 4G.

• ‘Broadband Wireless’ internet access via hotspots on hotels, airports, convention centre, coffee shops, restaurants etc. is a fast growing trend.

Surabhi VaishnavM. Tech - DC

(1st Semester, ECE Discipline)

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