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

Physical Channels, Logical Channels, Network, and Operation

Author: Lawrence Harte

Number of Pages: 84
Number of Diagrams: 21



Mobile Video
Magazine
Free Subscription


Printed or Electronic Version (1.1MB) Available - Electronic Version has Color Diagrams

This book explains how the 1x Evolution (1XEV) data only (EVDO) system modifies (optimizes) the 1.25 MHz IS-95 radio channel structure to provide high-speed data services (up to 2.4 Mbps) to wireless customers. The EVDO system allows cellular service providers carriers to use one of more IS-95 CDMA radio channels (with changes) to provide broadband high-speed data services to their customers. The EVDO is an "always-on" system that allows users to browse the Internet without complicated dialup connections.

You will learn that more....

Sample Diagrams

There are more than 21 explanatory diagrams in this book

EVDO and IS-95 Dual Mode Operation

This figure shows how the 1XEV system can provide both voice and data interoperation. This diagram shows how a voice call can be received while a user is transferring a file via the high-speed EVDO data session. This diagram shows that the EVDO signaling channel sends a message to the access terminal (the mobile telephone) alerting the user that an incoming call is waiting. If the user accepts the call, the mobile telephone will be transferred from an EVDO data only radio channel to an IS-95 traffic channel.


1xEV Voice and Data Transmission

This figure shows how the 1xEV system uses IS-95 channels for voice and EVDO channels for data transmission. This diagram shows that IS-95 CDMA radio channels has been designed to allow many simultaneous users to transmit with approximately the same data transfer rate. This example shows that the EVDO radio channel is designed to transmit the maximum power/data transfer rate for each user as need to transfer data.


IS-95 CDMA and EVDO Spreading Gain

This figure shows how the EVDO radio channel uses a lower spreading gain (less interference protection) to increase the overall data transmission rate. This diagram shows that the IS-95 system uses a relatively high spreading gain (more chips per bit of information) while the EVDO system uses a small amount of spreading gain (less chips per bit of information).


Table of Contents

Introduction to EVDO

Evolution of Existing Systems Data Only (EVDO)

- 1xEV Data Only (EVDO) System Evolution
- Upgrading IS-95 to EVDO
- EVDO Industry Specifications

EVDO Services

- High Data Rate (HDR)
- Stream Prioritization
- Quality of Service (QoS)
- Multicast Services
- Location Based Services (LBS)

EVDO Radio

- RF Channel Types
- Frequency Bands
- Frequency Reuse
- Channel Multiplexing
- RF Power Control
- Channel Structure
- Asynchronous Channels

Digital Data and Baseband Processing

- Packet Data Unit (PDU)
- Data Packet Encapsulation
- Channel Coding

EVDO Radio Channels

- Channel Bandwidth
- Adaptive Modulation
- Spreading Gain
- Forward Channel Transmission

Channels

- Forward Pilot Channel
- Forward MAC Channel
- Forward Traffic Channels
- Forward Control Channel
- Reverse Traffic Channels
- Reverse Access Channels

EVDO Devices (Access Terminals)

- User Identity Module (UIM)
- External Modems (USB or Ethernet)
- PCMCIA Air Cards
- Embedded Radio Modules
- Mobile Telephones

EVDO Network

- Access Points (Base Stations)
- Network Databases
- IP Backbone Network

IP Addressing

- Static and Dynamic (DHCP) Addressing
- Point-to-point protocol

EVDO System Operation

- Initialization
- Idle
- Initial Assignment/Access
- Connected Mode
- Dormant
- Default Route Update Protocol
- Scheduling Algorithm
- Multimode Capability Discovery Application
- Over the Air Programming (OTAP)

1xEV Handoff Operation

- 3G1X Circuit Services Notification Protocol
- Data to Voice (EVDO to IS-95)
- Voice to Data (IS-95 to EVDO)

1xEV Signaling

- Application Layer
- Stream Layer
- Session Layer
- Connection Layer
- Security Layer
- MAC Layer
- Physical Layer

EVDO Future Evolution

- Increased Data Transmission Rates
- Voice Services (EVDV)

About the Author

Mr. Lawrence Harte has over 29 years of experience in the electronics industry including company leadership, product management, development, marketing, design, and testing of telecommunications (cellular), radar, and microwave systems. He has been issued patents relating to cellular technology. He has authored over 75 articles on related subjects and has been a speaker and panel moderator at industry trade events. Mr. Harte earned executive MBA at Wake Forest University and received his Bachelors degree from University of the State of New York. During the TDMA digital cellular standard development process, Mr. Harte served as an editor and voting company representative for the Telecommunications Industries Association (TIA) TR45.3, digital cellular standards committee. As of 2003, Mr. Harte had authored and co-authored over 20 books relating to telecommunications technology. He has served as a consultant and expert witness for leading companies including Ericsson, Siemens, VLSI, AMD, Casio, Samsung, Sony, ATT, Nokia, Hughes and many others.

Description

This book explains how the 1x Evolution (1XEV) data only (EVDO) system modifies (optimizes) the 1.25 MHz IS-95 radio channel structure to provide high-speed data services (up to 2.4 Mbps) to wireless customers. The EVDO system allows cellular service providers carriers to use one of more IS-95 CDMA radio channels (with changes) to provide broadband high-speed data services to their customers. The EVDO is an "always-on" system that allows users to browse the Internet without complicated dialup connections.

You will learn that the key types of EVDO devices include external radio modems, wireless PCMCIA cards, embedded radio modules, and mobile telephones. External radio modems allow the customer to simply plug in their EVDO device to their USB or Ethernet data port to their desktop or laptop computer. EVDO PCMCIA cards can be added to most laptop computers or embedded radio modules allow devices such as PDAs and Laptops to integrate high-speed wireless without adding PCMCIA cards. Some CDMA mobile telephones include both IS-95 CDMA (voice and low speed data) and EVDO (high-speed packet data) capability.

Because the needs of voice and data communication are different, the airlink design of the IS-95 and EVDO radio channel structures are different. 1xEV devices can have single mode (only EVDO) or dual mode (both IS-95 Voice and EVDO data) capability. You will discover how single mode devices can only access the high-speed data rate (HDR) services on the EVDO radio channel and dual mode devices can access either the EVDO HDR channel or the IS-95 voice and medium-rate data traffic channels.

This book provides the basic technical components and operation of EVDO technology. You will learn the physical radio channel structures of the 1xEV system along with the basic frame and slot structures. Described are the logical channels and their functions. Explained are the key EVDO network components and how they communicate with each other.

Explained is the fundamental capabilities and operation of the EVDO radio channel including asymmetric data rates, adaptive modulation (QPSK, 8-PSK, or 16-QAM), and the use of a single control channel with multiple capabilities. An introduction to how a scheduling algorithm is used to fairly allocate the necessary data rates for EVDO users is provided. You will learn about the 64 coded channels and how up to 60 of them are available to provide data services to active users and how many other users (possibly 600 per channel) can be added who have a 10% usage activity factor.

Some of the most important topics featured in this book are:

How EVDO provides wireless Broadband data services
The fundamental components and operation of EVDO systems
Differences between EVDO data and IS-95 traffic/voice channels
The types of EVDO products and their uses
How EVDO services are setup using manual or over the air programming
The EVDO radio channel structure
The different types of physical and logical channels
EVDO network components
Network connections
How EVDO technology continues to evolve

back to top






Introduction to EVDO BK7781308$14.99

Click to enlargeeBook (pdf Format)
EB7781308$12.99
Click to enlargeBook+ eBook (pdf format)
BE7781308$19.99