2. Issues and Limitations on Mobile Computing Contents Wireless Issues – Mobile Computing – Wireless Architecture – Wireless Access Technologies – Wireless Applications Wireless Limitations Middleware for Mobile Computing NYANZI A. CCNP,CCNA,CCNAI, A+, MIT SANA, IT ESSENTIALS, MBA_IT 1

3. Mobile Computing What is the computing? – Operation of computers as Oxford Advanced Learner’s Dictionary states. What is the mobile? – That someone/something can move or be moved easily and quickly from place to place as Oxford Advanced Learner’s Dictionary states. What is the mobile computing? – Users with portable computers still have network connections while they move. NYANZI A. CCNP,CCNA,CCNAI, A+, MIT SANA, IT ESSENTIALS, MBA_IT 2

4. Wireless Architecture Personal Communication Network (PCN) – Extension of nowadays Infranstructure ITU Spesifications – Hierarchical Cell Structure – Global Roaming – Expansion of Radio Spectrume NYANZI A. CCNP,CCNA,CCNAI, A+, MIT SANA, IT ESSENTIALS, MBA_IT 3

5. Wireless Access Technologies Past and Current State – AMPS, TDMA, CDMA in USA, GSM in Europe, Public Packet Radio and CDPD – Private Mobile Radio – Wireless LAN – Satelite Systems NYANZI A. CCNP,CCNA,CCNAI, A+, MIT SANA, IT ESSENTIALS, MBA_IT 4

6. Wireless Applications Horizontal Applications – Yellow Pages – Movies Info Vertical Applications – Access to large amount of data (databases) Requirements – support to any mobile appliance – support to any network – capability to sustain long - short time disconections – access replicated data or databese file systems NYANZI A. CCNP,CCNA,CCNAI, A+, MIT SANA, IT ESSENTIALS, MBA_IT 5

7. Wireless Limitations Mobility – Auto configuration of the system – Location management Lookups (Track user’s call) Updates (Update user’s position and/or data) – Heterogeneity – Security Authentication – Spectrum range NYANZI A. CCNP,CCNA,CCNAI, A+, MIT SANA, IT ESSENTIALS, MBA_IT 6

8. Wireless Limitations Wireless Medium – Cost of Networks – Quantity and reliability of bandwidth – Environment obstacles Portability = Mobile Restrictions – Low Resources – Battery Constraints – Lack of Security NYANZI A. CCNP,CCNA,CCNAI, A+, MIT SANA, IT ESSENTIALS, MBA_IT 7

9. Middleware for Mobile Computing Middleware – What is the middleware? – Considerations Application Integration Device Independence Mobile Agents Wireless Application Protocol (WAP) – bring Internet content to digital cellular phones – creation of global wireless protocol specification – enable creation of contents with wide range of usage – to extend existing standards NYANZI A. CCNP,CCNA,CCNAI, A+, MIT SANA, IT ESSENTIALS, MBA_IT 8

10. WAP Research Interests Over the air provision Persistent Storage SIM Tool Kit Location Services Network Management Broadband Services Corporate Data Access IMT - 2000 (3G) Multimedia Capabilities NYANZI A. CCNP,CCNA,CCNAI, A+, MIT SANA, IT ESSENTIALS, MBA_IT 9

11. Summary & Further Issues Wireless Issues Wireless Limitations Wireless Middleware Research on: – Broadcast – Location Management – Spectrum Utilisation – Extension on existent ptotocols NYANZI A. CCNP,CCNA,CCNAI, A+, MIT SANA, IT ESSENTIALS, MBA_IT 10