The Quality view (goals, requirements) may differ from one organization to another and
among users.
QoS from the networking point of view refers to the capability of a network to provide better
service to selected network traffic over one or heterogeneous networks (e.g., IP-based,
ATM, VoIP, etc.). Supporting end-to-end QoS through the network was widely covered in
literature and industry. Hence, diverse solutions were developed to implement QoS support
at the network infrastructure. Integrated Services (IntServ) (Braden, Clark, & Shenker,
1994), Differentiated Services (DiffServ) (Blake, Black, Carlson, Davies, Wang, & Weiss,
1998), Multiprotocol Label Switching (MPLS) (Rosen, Viswanathan, & Callon, 1999), and
Bandwidth Broker for DiffServ Networks (Stattenberger & Braun, 2003) are all technologies
used to guarantee the QoS at the network level.
Clients are using Internet to invoke Web services; currently, the Internet treats all traffic
equally as ???Best Effort??? and provides no support for QoS. Supporting QoS between Web
services and their clients cannot be delivered while neglecting the QoS at the underlying
network connecting both parties. QoS of Web services have to include network properties
according to the public network (i.
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