1. Bluetooth™ and Java™ Technologies in the Wireless Environment
Michael T. Portwood, MS
President & CEO
Exuberance, LLC

2. Agenda What is Bluetooth™ wireless technology What is Jini™ technology
Technology Overview
Weaknesses
Strengths
What is Jini™ technology
Bluetooth, Jini™ technology, and the Wireless Environment
Conclusion
Question & Answer

3. What is Bluetooth™ Wireless Technology Overview
Technology started by Ericsson
Named after 10th century Viking king (Harald Blatand)
A global wireless technology specification
“Always on” communication
Radio frequency based
Inexpensive
Intended for …
Portable devices
Desktop machines
Peripherals

4. Bluetooth™ Wireless Technology Details
Baseband protocols
Circuit switching
Packet switching
Uses 24 GHz globally available unlicensed ISM radio band
Effective range is 10 meters
Slow communication rate (721Kbps)
Small number of stations
8 devices / piconet
3 voice channels
Secure
Spread spectrum

5. Comparison of Wireless Technologies
Feature & Function
Infrared
Wireless LANs
HomeRF
Bluetooth™
Connection Type
Infrared, narrow beam
Spread spectrum
Spectrum
Optical 850 nm RF
2.4 GHz
RF 2.4 GHz
Transmission Power
100mW
1mW
Data Rate
16Mbps
1Mbps,
2Mbps
1Mbps
Range
1 meter
100 meters
Typical home
3 meters
Supported Devices 2
127 8
Voice Channels 1
VOIP 6 3
Addressing
32 bit physical ID
48 bit MAC

6. Bluetooth™ Technology Strengths
Inexpensive
Superior range compared with IR
Omnidirectional, not requiring line of sight
Designed for ad hoc networking
Both voice and data channels
Well defined specification
Large number of implementing companies

7. Bluetooth™ Technology Weaknesses
Slow communication rate (1 Mbps)
Short networking range
Limited number of network connections
Large and complex specification (over 1000 pages)

8. Bluetooth™ Wireless Technology Application Areas
Pure computing applications
Presentations
Card Scanning
Synchronizing Data
Remote Synchronization
Printing
Scanners
Ubiquous Applications
Communicator platforms
Electronic Books
Travel
Home Entertainment
System Applications
In-vehicle systems
Payment Systems
Behavior Enforcement
Collaboration
Mobile E-commerce

9. What is Jini™ Technology
Jini™ Technology is designed for reliable distributed computing
Features
Simplicity
Reliability
Scalability

10. What Jini™ Technology is not
Jini is not a name server
Jini is not JavaBeans or Enterprise JavaBeans (EJBs)
Jini is not RMI
Jini is not a distributed operating system

11. Five Key Features of Jini™ Technology
Discovery
Lookup
Leasing
Remote Events
Transactions

12. Discovery
Discovery is the process of finding available lookup services
The Jini discovery protocol is the means by which Jini-aware code finds Jini communities

13. Jini™ Discovery Protocols
Multicast Request Protocol
Multicast Announcement Protocol
Unicast Discovery Protocol

14. Lookup
Lookup refers to the things that you can do with the lookup services that are determined via discovery
Lookup is similar to a name server
A process
Keeps track of all services that have joined a Jini community
Differs from a name server
Richer set of semantics than provided by traditional name server

15. Lookup Actions Publishing a Service Downloading a Proxy
Finding a Service

16. Leasing
Leasing refers to the process of allocating resources to community members
Leases are granted for a specified period of time
Addresses problems with network fragility

17. Remote Events
Remote event is a technique for members of the community to notify one another of change
Asynchronous notifications
Consistent with events used in Java

18. Differences Between Local and Remote Events
Local Events
Easier to deliver events in the order that they were generated
Always delivered
Cost of delivery is low
The sender knows that it can safely deliver the event to the consumer
Remote Events
Difficult to deliver events in the order that they were generated
Events may be undelivered
Cost of delivery is high
The sender does not know if it can safely deliver the event to the consumer

19. Transaction A transaction is a unit of work
Transactions are used to complete complex units of work that may fail before complete
Two phase commit
Transactions are not heavily used in Jini™ applications

20. Transaction (cont.) Transaction provide… Atomicity Consistency
Isolation
Durability

21. Jini™ Key Concept Overview
Discovery and Lookup establish a Jini community
Leasing helps Jini communities ensure stable, self healing, and resilient networks in spite of inevitable network failure
Events help Jini communities asynchronously communicate
Transactions help successfully complete complex operations and provide resolution for incomplete operations

22. How Bluetooth™ Complements Jini™ Technology
The key concepts found in Jini™ technology are found in Bluetooth™ wireless technology
Bluetooth™ technology is hardware what Jini™ technology is to software
Platform independent
A “standard”
Widely accepted

23. Bluetooth™ and Jini™ Both Bluetooth and Jini work well together
Ad hoc networking
Hardware specification complements software specification, and visa versa
Broadly accepted technologies

24. Using Jini™ Technology

25. Additional Resources Bluetooth™ Wireless Technology Jini™ Technology
Jini™ Technology

26. Conclusion Bluetooth™ and Jini™ technologies compliment one another
Bluetooth™ technology excels at short duration ad hoc networking
Jini™ technology complements Bluetooth™ Wireless Technology
Many of the features of Jini™ technology can be found within the Bluetooth™ specification

27. Question & Answer

28. For Additional Information
World Wide Web site
Presentation
Presentation notes
contact