Presentation on theme: "Deployment of Broad Band WMAN using Wi-max Standards Dr. (Mrs.)Nupur Prakash Professor, School of Information Technology GGS Indraprastha University, Delhi,"— Presentation transcript:
Deployment of Broad Band WMAN using Wi-max Standards Dr. (Mrs.)Nupur Prakash Professor, School of Information Technology GGS Indraprastha University, Delhi, INDIA
Wireless Networks Facilitate Freedom from wires All pervasive computing Access to network resources anywhere anytime Higher productivity and connectivity
Features of Wireless Networks WPANWLANWMAN Protocol StandardsBluetooth, IrDA, UWD Wi-fiWi-Max Frequency Range 2.4 to Ghz 5.15 to 5.35Ghz 10 Ghz to 66 Ghz Speed.1- 4 Mbps1-54 Mbps2-70 Mbps Cell radius1-10 ms1-500 ms1km-50km ModulationFHSS OFDM, DSSS QPSK
WiMax Technology WiMax (Worldwide Interoperability for microwave access) A technology based on an evolving standard for point-to-multipoint wireless networking Medium range wireless data communication standard (IEEE ) Solution for Wireless Metropolitan Area Network (WMAN) BWA (Broadband Wireless Access) Solution
What is WiMax? Operates on frequencies between 10-66GHz 1 to 10 mile range (10 miles assuming rural areas with little blockages). 70MB/second transfer rate Image copyright Intel (2004)
Broadband Fixed wireless access architecture Supports P-MP configuration Hub uses broad coverage antenna mounted on towers or tall building and transmits to a group of subscribers Subscriber uses highly directional antenna pointed towards the hub
Broadband wireless access system architecture using WiMAX Standards
WiMax Forum WiMax was Founded in Jan 03 No Profit organization comprised of wireless access system manufacturers component suppliers software developers and carriers. Promotes conformance, compliance and interoperability WiMax Forum certified product
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 Telecom Alvarion Qwest Proxim Aperto Networks Siemens ZTE * Partial List
WiMAX Standard for WMAN The IEEE standard defines a powerful OFDM and NLOS technology for wireless metropolitan area network (WMAN) provides broadband wireless connectivity to Fixed, Portable and Nomadic users. can be used to backhaul LANs to the Internet provides inter-campus connectivity and a wireless alternative to cable, DSL, T1s or even fiber or cable
WiMax Features provides up to 50-kilometers of service area range allows users to get broadband connectivity without needing direct LOS with the base station single base station simultaneously supports hundreds of businesses with T1/E1-type connectivity thousands of homes with DSL-type connectivity
Benefits of Broadband Wireless Access Very cost effective to deploy to rural communities and businesses, where terrain or situation do not allow traditional cabling or satellite connectivity Resolve traditional Last Mile customers reach issues and enhance broadband services to rural, low density communities. broadband in-fill for DSL black-spots adding capacity to mobile & line networks Broadband and Internet access in underserved, developing communities.
IEEE Versions a uses the licensed and license-exempt frequencies from 2 to 11Ghz Supports Mesh-Network b Increases spectrum to 5 and 6GHz Provide QoS (for real-time voice and video service) c Represents a 10 to 66GHz system profile d Improvement and fixes for a e Addresses on Mobile Enable high-speed signal handoffs necessary for communications with users moving at vehicular speeds
The family of standard
Deployment of Wi-Max Wi-Max deployment is planned in three phases. Phase one: Hubs with outdoor antennas that target known subscribers in a fixed location leading to quick inexpensive solution without laying cable. Phase two: will roll out indoor antennas making installation simpler at user sites leading to simple, low cost installation of fixed wireless access. Phase three: will launch IEEE e Wi-Max certified hardware available in portable solutions supporting roaming of users within a service area. WiMax compatible PDAs and laptops are expected to be launched by 2007
Image copyright Intel (2004)
Infrastructure required for WMAN using Wi-Max Base Stations Subscribers Module Send/Receive Antenna Receiver/Transmitter Router connected to Server via cable or hot-spot The backhaul unit
Wireless Broadband Communities
WiMax Protocol stack MAC Convergence Sublayer (ATM, Ethernet Q, IP) MAC MAC Privacy Sublayer Physical Layer ATM Ethernet, 802.1Q Internet Protocol Packing, Fragmentation ARQ, QoS Authentication, Key Exchange Privacy(encryption ) OFDM, Ranging Power Control, DFS, Tx, Rx
Physical Layer Point-to-multipoint architecture, BS transmits a TDM signal, with individual subscriber stations allocated time slots serially. burst single-carrier modulation (OFDM) with adaptive burst profiling transmission parameters, including the modulation and coding schemes, adjusted individually to each subscriber station (SS) on a frame-by-frame basis. Channel bandwidths of 20 or 25 MHz (typical U.S. allocation) or 28 MHz (typical European allocation) are specified
Frame Structure and PDU Each MAC packet consists of the three components, 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 redundancy code (CRC).
Security Mechanism The IEEE protocol supports security mechanism for terminal authentication and privacy. Each connection is mapped to a Security Association (SA) that specifies the encryption algorithm to be used the data authentication algorithm to be used and the algorithm for exchanging the data encryption keys.
Security Implementation Authentication is based on the use of PKI technology-based X.509 digital certificates. Each Subscriber Station (SS) contains both a manufacturer-issued factory-installed X.509 digital certificate and the certificate of the manufacturer. Privacy Sublayer uses privacy protocol that is based on the privacy key exchange management (PKM) protocol PKM protocol uses X.509 digital certificates with RSA public key encryption for SS authentication and authorization key exchange.
Wireless Roaming The e task group is working on developing a specification to enable mobile clients PDAs using embedded chips or laptops using e enabled cards These clients will be able to handoff between base stations, enabling users to roam between service areas.
Hand-off Procedure Roaming and hand offs between heterogeneous 802 networks is being studied Hand off procedures would allow mobile devices to switch the connection from one base station to another from one 802 network type to another (such as from to ) from wired 802.x to , connections.
Seam less Roaming As the mobile client (a notebook or a PDA user) moves within WMAN it remains connected via Ethernet or when docked and stays connected with when roaming the city or suburbs The goal is to standardize handoffs between heterogeneous networks and support seam less roaming. The mobile devices thus become interoperable as they move from one network type to another.
Broadband Wireless Access e
Expected players Backed by 140 companies in the WiMax Forum (www.wimaxforum.org) Intel is producing chips and currently managing 50 test sites around the country Covad (currently a big DSL provider) is considering using WiMax for last mile connections.
Adoption of Broadband Wireless at Ahmedabad Rural District, INDIA Multistoried Bldg. Civil Hospital District Inds. Center Superintendent Of Police Office High Court Ahd.Diet Dist. Court Krushi Bhavan Jal Bhavan Sales Tax Karai Blk.12 Circuit House CP Office Collector RTO Jail GMDC
Gujarat State Govt BB Wireless WAN Project
WiMAXs Path to future Broadband Mobility T I M E Satellite Network Telephone Network Internet IP Based Access Network