Accession Number:
ADA279785
Title:
A Group Communication Approach for Mobile Computing Mobile Channel: An ISIS Tool for Mobile Services
Descriptive Note:
Corporate Author:
CORNELL UNIV ITHACA NY DEPT OF COMPUTER SCIENCE
Personal Author(s):
Report Date:
1994-05-01
Pagination or Media Count:
18.0
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 Mobile Channel, for use with the ISIS system. Mobile Channel is based on a combination of the two replication schemes the primary-backup approach and the state machine approach. Mobile Channel 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 hand-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.
Descriptors:
Subject Categories:
- Computer Systems