Wireless/Mobile Computing Technologies and Design Issues
Reference
1. Randy H. Katz, "Adaptation and Mobility in Wireless Inofrmation Systems,"
IEEE Personal Communications, 1st Quarter 1994.
2. Brian Marsh, Fred Douglis, Ramon Caceres, "System Issues in Mobile Computing," Matsushita Information Technology Laboratory, MITL-TR-50-93, 1993.
3. Daniel Duchamp, Stevens Feiner, Gerald Maguire, Jr., "Software
Technology for Wireless Mobile Computing,"
IEEE Network Magazine, November 1991.
Technology
- Wireless LAN: NCR's WaveLAN (2 Mb/sec), Motorola's Altair (15 Mb/sec)
ISM(Industrial, Scientific, and Medical) bands
902-928, 2400-2483.5, 5725-5850 MHz
Radio Frequency, Microwave, Infrared
TDMA, FDMA, CDMA (Spread Spectrum)
- Analog Cellular Phone Networks
< 30 Kb/sec, usually 9600 b/sec
e.g., AMPS
- Digital Cellular
e.g., IS-54, GSM, Qualcomm's Q-CDMA
- Satellite
GEO: Inmarsat, Qualcomm's OmniTRACS --- 5k-15k (down), 55-165 (up)
Little LEO: Leossat, Starnet, and Vitasat --- 4800 (down), 2400(up)
Big LEO: Aries, Ellipso, Motorola's Iridium (55kb/sec)
NASA's ATCS (1.5 Mb/sec), Hughes Network System's DirectPC (12 Mb/sec)
Networking Issues
- IP routing in mobile networks
- Mismatch between TCP and wireless networking
- Handoff issues for continuous media
- Audio/Video coding over wireless links
- Adaptive link management in wireless LAN
- Location strategies in large-scale mobile networks
- Software radio
Distributed Systems Issues
- Disconnected operation
- Agents or guardian angels
- Environment migration
- X in wireless environments
- Elastic execution engine
- Privacy
- Scheduling for broadcast file system
- Operating systems support in API, GUI, and storage system for PDA