IEEE 802.20Mobile Broadband Wireless

Access (MBWA)

cek

MBWA ?

• Low-cost, always-on, and truly mobile broadband wireless networks

• Also known as WWAN, Mobile-Fi• Integration between the three domains of work,

home, and mobile• MBWA Work Group Approved by IEEE on Dec 2002,

within IEEE 802.16 (WiMax) committee• MBWA PHY and MAC layer approved on Jun 2008• Emerging technology not yet implemented in

application level

IEEE 802.20 Standard

• Efficient Packet-based air interface • Optimized for IP Services• Affordable, Spectrum-efficient, Ubiquitous

and Always-on• Multi-vendor interoperable mobile broadband

wireless access networks• For business and residential end user markets• Access to infotainment services

MBWA Features

• Licensed frequency bands below 3.5 GHz• Bandwidths of 1.25, 5 and 10 MHz• Peak data rate per user >1 Mbps (to 80 Mbps)• Supports vehicular mobility up to 250 Km/h• Cell size commensurate with MAN• Sustained user data rates• Supports more number of active users• Low Latency and Jitter

Why IEEE 802.20 ?

• Spectrum Efficient: very high data rates and aggregate data capacity in minimum spectrum

• Reduced cost of deploying and operating 802.20 networks

• High-speed data services at more affordable prices• Full Mobility: supports various vehicular mobility

classes• Global mobility and roaming• Modification to old technology is not sufficient

MBWA General Architecture

(AccessTerminal)

(AccessNode)

MBWA Mesh Network

Challenges for Mesh Networks

• Compatibility with old/current technologies• Coexistence with other technologies• Scalability• Security• Mobility (Network Handoff)• Other challenges- Quality of Service(QoS),

Resource Management, Power Management

MBWA Modes

• IEEE 802.20 standard specifies two operation modes1. Wideband Mode (preferred mode)

>1MHz carrier bandwidth (high data rate) Used for FDD and TDD

2. 625k-MC Mode 625KHz carrier bandwidth Used for TDD only

MBWA Layered Architecture

Wideband Mode Architecture

MBWA Layers

• Physical (PHY) Layer: Provides the channel structure, frequency, power output, modulation, and encoding specifications for the Forward and Reverse Channels

• Lower MAC Sublayer: Defines the procedures used to receive and to transmit over the Physical Layer

• Radio Link Sublayer: Provide as reliable and insequence delivery of Application Sublayer packets, multiplexing of Application Sublayer packets, and Quality of Service (QoS) negotiation in support of applications

• Service Sublayer: Provides the Signaling Protocol service for transporting air interface protocol messages.

MBWA Layers cont…

• Connection Control Plane: Provides air link connection establishment and maintenance services

• Session Control Plane: Provides protocol negotiation and protocol configuration services

• Route Control Plane: The Route Control Plane provides creation, maintenance, and deletion of routes

• Security Functions: Security functions include functions for key exchange, ciphering, and message integrity protection

• MAC and PHY MIB: The MAC and PHY Management Information Base (MIB) provides usage statistics gathered from all protocols and management planes

MBWA Security

• Wireless network is less inherently secure than wired networks

• Key Security Concerns:1. Protection against theft of service on behalf of the

service provider2. Protection of the user privacy3. Deterring denial-of-service attacks

• Protection Mechanisms:1. Authentication2. Encryption

MBWA Authentication

• For both Mobile station and Base Station• Based on digital signatures using RSA algorithm• Digital certificate contains information of the

issuer and its public key• RSA modulus ranges from 1024 bits to 2048 bits• Key exchange is public using Elliptic Curve

Cryptography protocol

MBWA Encryption

• Uses Advanced Encryption Standard (AES) encryption algorithm1. Evaluated, scrutinized, found sound for secure

encryption by cryptographic experts world wide2. Uses stream cipher mode3. Symmetric-key encryption standard4. Key sizes of 128, 192 and 256 bits

• Provides user anonymity, privacy and integrity

MBWA, IEEE 802.16E & 3G

MBWA Advantages

• Fully Mobile system withoutbackward compatibility constraints

• Intertechnology roaming andhandoff

• Intercell and Intersector handoff• High Spectral Efficiency (1 b/s/Hz/cell)• Cost Effective (for both Service Provider and Service User)• High throughput data• Highly Secure (through authentication and encryption)

MBWA Applications

• Internet ServicesWeb browsing, e-mail (POP3, SMTP, IMAP), file transfer (FTP), audio and video streaming

• Virtual Private Network (VPN)• Voice-Over-Internet Protocol (VoIP)• Instant Messaging Service• Online Multiplayer Gaming• Infotainment Services– Info-games, VoD, flash news, weather, stocks

Conclusion

• A high bandwidth, low latency, always-on Internet service with mobility

• MBWA is a backward compatible standard• A standard is very ambitious with wide-

ranging scope• Only future will tell whether MBWA will prove

to be feasible from technological and engineering standpoints

References• W. Bolton, Y. Xiao, M. Guizani, "IEEE 802.20: Mobile Broadband Wireless

Access", IEEE Wireless Communications, vol. 14, issue 2, pp. 84-95• M. Klerer, “Introduction to IEEE 802.20: Technical and Procedural

Orientation,” . http://grouper.ieee.org/groups/802/20/Documents.htm• IEEE 802.20 WG, "Mobile Broadband Wireless Access Systems – Five

Criteria: Vehicular Mobility", IEEE 802.20 PD-03• F. Zon, X. Jiang, Z. Lin, "IEEE 802.20 Based Broadband Railroad Digital

Network – The Infrastructure for M-commerce on the Train", Proc. ICEB 2004, Beijing, China, pp. 771-776

• IEEE 802.20; http://en.wikipedia.org/wiki/IEEE_802.20• IEEE 802.20 Mobile Broadband Wireless Access (MBWA);

http://www.ieee802.org/20/• Certicom, “Elliptic Curve Cryptography,”

http://www.certicom.com/index.php?action=res,ecc_faq

Thank You