ISSN : 1796-203X
Volume : 3    Issue : 8    Date : August 2008

Multi-Index Cooperative Mixed Strategy for Service Selection Problem in Service-Oriented Architecture
Yimin Shen, Jing Zhang, and Yushun Fan
Page(s): 69-76
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Under the environment of Service-Oriented Architecture (SOA), service users have to decide how to
choose the proper provider from the candidates to obtain optimal service level. The existing approaches
based on the optimization theories usually ignore the decision conflicts among users, which result in
periodic QoS fluctuation and poor system performance. This paper treated the service selection problem
as an inconstant-sum non-cooperative n-person dynamic game with incomplete information. The
mechanism that generated the decision conflicts is discussed at first, and then Multi-index Cooperative
Mixed Strategy (MCMS) with corresponding algorithm for finding its optimal solution is developed.
Simulation shows that MCMS offers service users an optimal strategy that reduces the fluctuation of QoS
and improves performance of SOA. Moreover, the stability and equilibrium of MCMS make it acceptable to
most of the users, thus MCMS is able to improve predictability and controllability of SOA significantly.

Index Terms
service oriented architecture (SOA), multiindex, service selection, mixed strategy