Wireless Network Protocols for Mobile Electronic Commerce Systems (I)

As a sub-project of the joint project
entitled “A Mobile Electronic Commerce
System,” this project, named “Wireless
Network Protocols for Mobile Electronic
Commerce Systems,” attempts to design
wireless network protocols to enable mobile
E-commerce. We will carry out this project
in a three-year span.
In the first year, we studied the impact
of IP mobility on QoS and reliable
multicasting. We proposed a new protocol
called RMMP (Reliable Mobile Multicast
Protocol) and analyzed the performance of
existing reliable multicast protocols for host
mobility in IP networks. We examined two
schemes: global token rotation and local
recovery with tunneling. Both schemes
support reliable multicast for mobile hosts at
the expense of extra buffer spaces in mobility
agents. We model the buffer requirement of
each protocol as an M/G/¥ queuing system,
from which we can further derive service
latency and system throughput. We have also
conducted simulations to verify the derived
analytical model. The results show that the
local recovery with tunneling mechanism has
much smaller buffer size, higher throughput,
and lower service latency, as compared to
other protocols.
The preliminary results of this project
have been published on the IEEE
GLOBECOM 2001.