Click to enlargeIntroduction to WiMax <a name="top">

Wireless Broadband Technology, Operation, and Services

Author: Lawrence Harte
ISBN: 1-932813-74-3
Page Size: 8.5" x 11" soft cover book
Copyright: 2006

Number of Pages: 112
Number of Diagrams: 41

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This book explains the functional parts of a WiMax system and its basic operation. You will learn how WiMax can use base stations to provide high speed data connections that can be used for voice, data and video services to distances of over 30 km.

The original WiMax system was designed to operate at 10-66 GHz and it had to change to offer broadband wireless access (BWA) in the 2-11 GHz frequency range. To do this, the WiMax standard includes variants (profiles) that use different combinations of radio channel types (single carrier –vs- multicarrier), modulation types, channel coding types to provide fixed, nomadic or portable services.

WiMax can provide multiple types of services to the same user with different QoS levels. For example, it is possible to install a single WiMax transceiver in an office building and provide real time telephone services and best effort Internet browsing services on the same WiMax connection. To do this, WiMax was designed to mix contention based (competitive access) and contention free (polled access) to provide services which have different quality of service (QoS) levels.

You will learn about WiMax protocols and how they are designed to allow for point to point (PTP), point to multipoint (PMP) and mesh networks. Operators can use the mesh configuration to allow it to link base stations without the need to install or lease interconnecting communication lines. Some of the services WiMax operators can provide include leased line, residential broadband, commercial broadband and digital television (IPTV) services.

WiMax can use radio channel bandwidths that can vary from 1.25 MHz to 28 MHz and data transmission rates can exceed 155 Mbps. The types of data connections on WiMax radio channels include basic (physical connection), primary (device control), secondary (configuration) and transport (user data).

You will learn about the typical range for WIMAX systems and how to extend the range of WIMAX systems through the use of directional antennas. Some of the most important topics featured include:

• The Functional parts of WiMax systems
• Basic WiMax Operation
• The types of WIMAX services
• Data transmission rates
• WIMAX industry standards
• WIMAX technology evolution
• Protocols used in WiMax
• Physical and logical channel types
• The different types of WIMAX devices
• Basic security operation

Sample Diagrams

There are 41 explanatory diagrams in this book

WiMAX System Types

This figure shows some of the different types of uses that WiMax networks can provide. This diagram shows that WiMax systems can be used for point-to-point links, residential broadband or high-speed business connections. This example shows that the point to point (PTP) connection may be independent from all other systems or networks. The point to multipoint (PMP) system allows a radio system to provide services to multiple users. WiMax systems can also be setup as mesh networks allowing the WiMax system to forward packets between base stations and subscribers without having to install communication lines between base stations.

WiMAX Radio Channels

This figure shows that WiMax radio channels can be single carrier or multiple carriers. This diagram shows that the bandwidth of WiMax radio channels can vary from 1.25 MHz to 28 MHz in steps of 1.75 MHz. This example also shows that a WiMax system that is using multicarrier OFDMA and how some of the subcarriers have been assigned to a specific user.

WiMAX Standards Evolution

This figure shows how 802.16 broadband wireless systems have evolved over time. This diagram shows that the original 802.16 specification defined fixed broadband wireless service that operates in the 10-66 GHz frequency band. To provide wireless broadband service in lower frequency range, the 802.16A specification was created that operates in the 2-11 GHz frequency band. To provide both fixed and mobile service, the 802.16E specification was developed.

Table of Contents

Introduction to WiMax
-Data Transmission Rates
-WiMax Service Rates
-Radio Coverage Area
-Channel Loading

WiMax Standards

Types of Connections
-Basic Connection
-Primary Management Connection
-Secondary Management Connection
-Transport Connection

Quality of Service (QoS)
-Service Availability
-Data Throughput
-Error Rate
Bit Error Rate (BER)
Packet Loss Rate (PLR)

Scheduling Services
-Unsolicited Grant Service (UGS)
-Real Time Polling Service (RTPS)
-Non-Real Time Polling Service (nRTPS)
-Best Effort Service (BE)

Wireless Broadband Applications
-Digital Telephone
-Broadband Data Connections
-Digital Television

-Orthogonal Frequency Division Multiplexing (OFDM)
-Orthogonal Frequency Multiple Access (OFDMA)
-Frequency Reuse
Binary Phase Shift Keying (BPSK)
Quadrature Phase Shift Keying (QPSK)
Quadrature Amplitude Modulation (QAM)
Adaptive Modulation
-Diversity Transmission
Transmission Diversity
Receive Diversity
Frequency Diversity
Temporal (Time) Diversity
Spatial Diversity
-Adaptive Antenna System (AAS)

-Service Flows
-Service Class

WiMax Radio
-Frequency Bands
-Medium Access Control Protocol Data Units (MAC PDUs)
-Radio Packets (Bursts)
-Channel Descriptors
-Channel Coding
Error Correction Coding
-Radio Propagation
Line of Sight (LOS)
Not Line of Sight (NLOS)
-Duplex Transmission
-Ranging (Dynamic Time Alignment)
-Dynamic Frequency Selection (DFS)
-RF Power Control
-Channel Measurement Reports
-Payload Header Suppression (PHS)
-Convergence Sublayer (CS)
-Network Topology
Point to Point (PTP)
Point to Multipoint (PMP)
Mesh Network
-Sub Channelization (Sub-carriers)
-Retransmission Policy
Selective Repeat (SR)
Hybrid Automatic Repeat Request (HARQ)
-Physical RF Channels
-WiMax Variants
-Logical Channels
Connection ID (CID)
Service Flow ID (SFID)
-WiMax Protocol Layers
MAC Convergence
MAC Layer
MAC Privacy
Physical Layer
Security Sub-layer

WiMax Operation
-Channel Acquisition
-Initial Ranging
-Medium Access Control
-Radio Link Control (RLC)

Wireless Broadband System Parts
-Subscriber Stations (SS)
-Base Stations (BS)
-Packet Switches

WiMax Testing

About the Author

Mr. Lawrence Harte is the president of Althos, an expert information provider whom researches, trains, and publishes on technology and business industries. He has over 29 years of technology analysis, development, implementation, and business management experience. Mr. Harte has worked for leading companies including Ericsson/General Electric, Audiovox/Toshiba and Westinghouse and has consulted for hundreds of other companies. Mr. Harte continually researches, analyzes, and tests new communication technologies, applications, and services. He has authored over 60 books on telecommunications technologies and business systems covering topics such as mobile telephone systems, data communications, voice over data networks, broadband, prepaid services, billing systems, sales, and Internet marketing. Mr. Harte holds many degrees and certificates including an Executive MBA from Wake Forest University (1995) and a BSET from the University of the State of New York, (1990).

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