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Most-urgent-first protocol for real-time wireless channels in a digital cellular/PCN environment
Technical Paper
1995-16-0140
Sector:
Language:
English
Abstract
Providing mobile clients with real-time access to a shared
information base in a digital cellular or personal communication
network (PCN) environment is vital to the success of many future
intelligent transportation systems (ITS) applications. The
well-known limiting factors of such an environment are the
relatively low channel bandwidth, a small number of available
channels, and a potentially large number of users/clients to
serve.
A most-urgent-first (MUF) protocol is proposed to solve the
problem of accessing reverse (client-to-server) traffic channels,
where mobile clients compete to convey their requests to the
server. A method is also presented for evaluating the urgency of
each client's request for traffic information. The MUF protocol
gives more urgent requests higher priority, responds faster to more
important inquirers, accommodates more clients in each channel, and
allows information sharing among a potentially large number of
clients. Moreover, all services can be provided in real-time.
Finally, an UltraSAN model has been developed to evaluate the
performance of the MUF protocol. Some of the issues related to
operation of the MUF protocol are also discussed