Inductive Approaches Based on Trial/Error Paradigm for Communications Network
Abdelhamid Mellouk · 2008
Due to the growing needs in telecommunications (VoD, Video-Conference, VoIP, etc.) and the diversity of transported flows, communication networks does not meet the requirements of the future integrated-service networks that carry multimedia data traffic with a high QoS. The main drivers of this evolution are the continuous growth of the bandwidth requests, the promise of cost improvements and finally the possibility of increasing profits by offering new services. First, it does not support resource reservation which is primordial to guarantee an end-to-end Qos (bounded delay, bounded delay jitter, and/or bounded loss ratio). Second, data packets may be subjected to unpredictable delays and thus may arrive at their destination after the expiration time, which is undesirable for continuous real-time media. In this context, for optimizing the financial investment on their networks, operators must use the same support for transporting all the flows. Therefore, it is necessary to develop a high quality control mechanism to check the network traffic load and ensure QoS requirements. It’s clear that the integration of these QoS parameters increases the complexity of the used algorithms. Anyway, there will be QoS relevant technological challenges in the emerging hybrid networks which mixed several different types of networks (wireless, broadcast, mobile, fixed, etc.). QoS management in networking has been a topic of extensive research in a last decade. As the Internet network is managed on a best effort packet routing, QoS assurance has always been an open issue. Because the majority of past Internet applications (email, web browsing, etc.) do not used strong QoS needs, this issue is somewhat made less urgent in the past. Today, with the development of internet real-time application and the convergence of voice and data networks, it is necessary to develop a high quality control mechanism to check the network traffic load and ensure QoS requirements. Constraints imposed by QoS requirements, such as bandwidth, delay, or loss, are referred to as QoS constraints, and the associated routing is referred to as QoS routing which is a part of Constrained-Based Routing (CBR).