Handling QoS in a dynamic real-time environment

In the new emerging communications infrastructures there is the desire and the demand to build applications with every increasing requirements in what concerns real-time and dependability. However, the dynamic characteristics of those environments make it difficult even if it is possible to always offer the desired quality of service (QoS). It is thus important to have some support to handle QoS in such scenarios. In this paper, based on the quasi-synchronous approach, we propose a set of group communication protocols with different QoS properties (timeliness, order, agreement) that are built in a component-based fashion. Depending on the characteristics of the environment, applications may choose the best QoS that is still possible to have at a give moment.