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|Title: ||A Group Communication Approach for Mobile ComputingMobileChannel: an ISIS Tool for Mobile Services|
|Authors: ||Cho, Kenjiro|
Birman, Kenneth P.
|Keywords: ||computer science|
|Issue Date: ||May-1994|
|Publisher: ||Cornell University|
|Abstract: ||This paper examines group communication as an infrastructure to support mobility of users, and presents a simple scheme to support user mobility by means of switching a control point between replicated servers. We describe the design and implementation of a set of tools, called MobileChannel, for use with the ISIS system. MobileChannel is based on a combination of the two replication schemes: the primary-backup approach and the state machine approach. MobileChannel implements a reliable one-to-many FIFO channel, in which a mobile client sees a single reliable server; servers, acting as a state machine, see multicast messages from clients. Migrations of mobile clients are handled as an intentional primary switch, and hands-offs or server failures are completely masked to mobile clients. To achieve high performance, servers are replicated at a sliding-window level. Our scheme provides a simple abstraction of migration, eliminates complicated hand-off protocols, provides fault-tolerance and is implemented within the existing group communication mechanism.|
|Appears in Collections:||Computer Science Technical Reports|
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