Tier and DTN
®DTN Pros:
®Cost:
better use of resources, more tolerant of problems
®Reliability: delay hides transient problems
®Ease of deployment: can be more ad hoc, less coordination than a synchronous system
®Coverage:
Intermittent coverage >> full time coverage
®Con: Not
really interactive, or only interactive in
some areas
®DTN: routing and storage for messages
®TierStore: Storage infrastructure on top of DTN
®Supports e-mail, v-mail, web proxy, data collection
apps, broadcast
®Claim: Very low cost per user