Request Replication: An alternative to QoS aware service selection

In this paper, we propose a new strategy for QoS-aware service selection which takes advantage of the existing variability in QoS data to provide higher quality services with less cost compared to conventional QoS-aware service selection methods. In this method, we replicate each request over multiple independent services to achieve the required QoS. We also present a number of recommendations regarding the QoS advertisements in SOA so as to reveal more information about underlying distributions and thus enabling more sophisticated selection strategies. We will show using various examples how this approach works and enhances conventional QoS-aware service selection methods.