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233
Chapter 10
Location Service, Information Dissemination
and Object Tracking in Wireless Sensor
Networks by Using Quorum Methods
Dan-Dan Liu1 and Xiao-Hua Jia21
1 Computer School
Wuhan University, Wuhan, China 430072
liudd2004@hotmail.com
2 Department of Computer Science
City University of HongKong, HongKong
jia@cs.cityu.edu.hk
1 Introduction
1.1 Quorum System
Quorum methods were originally used in consistency control for data replicas
in distributed database systems. Replication of data is the key technology for
high availability and fault tolerance in a distributed system. Upon receiving
a request to perform an operation on a particular datum, the server is responsible
for cooperating with other servers in the group that have copies of
the data. Di?®erent replication schemes involve di?®erent numbers of servers for
the successful accomplishment of an operation. For example, in the traditional
read-any/write-all scheme, a writing request must be finished by all servers in
the system, so that a read operation can be performed by any single server.
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