16
V. Liberatore
Pervasive Computing
Protocol Stack
Dealing
with complex systems
Explicit structure
allows identification,
relationship of complex
system’s piecesnLayered reference model for discussion
Modularization
eases maintenance, updating
of system
nChange of implementation of layer’s service transparent to rest of system
nE.g., change in gate procedure doesn’t affect rest of system
Application
(the
control application, e.g., close-lever)
Middleware
(common to
multiple applications, e.g.,
resource discovery)
Transport
(e.g., TCP, RTP/UDP)
Data
Link
(low level communication,
e.g. Ethernet, Infinet,
etc.)
Network
(convergence layer: IP)