22 research outputs found
Route selection for QoS over Mobile IP
No full textInfluenced by the availability of powerful portable computers, and the expansion of Internet-based services, consumers demand mobile Internet. This implies supporting user mobility while sustaining network connectivity which in turn requires more sophisticated routing methods than simple static Internet protocol. Routing optimization is critical for the efficiency of mobile Internet as it directly impacts resource utilization in the network. On the other hand, while connected to the Internet, users want to enjoy real-time services. Granting quality of service for real-time multimedia applications is one of the major concerns for Internet Service Providers. In the mobile Internet context, as a result of a signalling conflict, providing quality of service declines in presence of routing optimisation. This conflict must be resolved to achieve efficient resource utilization in the networks and provide quality of service for real-time Internet-based services. This thesis presents a solution for resolving the aforementioned conflict. Initially a set of requirements are established for a new solution. The fundamental idea is developed based on exercising routing optimization according to quality of service requirements and network conditions. A new protocol architecture for Mobile IP (MIP) is built based on a cross-layer design technique. This design implies that a new data flow collects the necessary parameters in the network. This data is passed to a new entity in the network layer of the MIP protocol stack that inter-connects IP, routing, mobility and resource reservation protocols. Based on network conditions and the quality of service requirements the optimal path is selected over which the resources are reserved for the duration of the connection. The new solution named MIP with Routing Optimization and QoS (MIP-ROQS) removes the signalling conflict and furthermore, results in increased network performance. Simulation of this solution demonstrates reduction in application end-to-end delay and delay variation, improved core network by reducing the amount of control traffic and dropped traffic and improved access network by reducing its delay. Moreover, we integrate Multi Protocol Label Switching (MPLS) architecture and MIP-ROQS to take advantage of MPLS labelling mechanism to label the optimal path selected by MIP-ROQS for the duration of a session. This integration makes IP-in-IP tunnelling in data forwarding redundant. MPLS is used to switch packets and label the optimal path over which the resources are reserved. Using this approach, the transmission delay, and packet processing overhead are further reduced
Feature interactions detection in intelligent networks
No full textIntelligent Networks (IN) have been introduced for rapid development and deployment of new services. However, these new services may interact with old ones in a negative and unexpected manner. This is known as feature interaction (FI) problem. In this thesis, a new pragmatic approach for feature interaction detection is proposed. A pragmatic method for FI detection is based on the gained experience from the study of the known FIs. In this approach, the causes of FIs given in Bellcore and European benchmarks serve as the starting point. The sufficient information for feature description is derived from these causes. This information is modelled using an object-oriented template. Features are described in terms of necessary resources and actions. Feature participants call model, their triggering constraints and operations describe the behaviour of the feature. The detection method takes these models as input and checks for interactions between features. The method consists of three parts: filtering algorithm, feature instantiation and detection algorithm. Using the filtering algorithm, all the possible interaction-prone scenarios are produced and the actual features are instantiated using the list of topologically different call combinations. The detection algorithm is run on these actual participants of the features in order to detect potential interactions. The approach has been implemented as a tool and applied successfully to the existing feature interaction benchmarks
Methods and managers for multi-layer cloud management system
No full textA method for managing a multi-layer cloud seeks a resource source able to provide customer-requested cloud resources within a first group of resource sources at one layer of the multi-layer cloud. A resource source is a data center or a group of resource sources. If the resource source able to provide customer-requested cloud resources is not found in the first group, the request is forwarded to a second group of resource sources at a higher level in the multi-layer cloud, the first group being one of the second group's resource sources.</p
Cloud Networking: An Infrastructure Service Architecture for the Wide Area
No full textWe present an architecture for cloud networking, the provision of virtual infrastructure in a multi-administrative domain scenario, where data centre and network operators in- teract through defined interfaces to provide seamless virtual infrastructure. To support this scenario we introduce the flash network slice, dynamic elastic network connec- tions that compose to form integrated cross-domain networks. Flash network slices support decomposition of virtual infrastructure into partitions that can be managed independently but seamlessly interconnected across administrative boundaries. The approach supports limited information disclosure about implementation details on be- half of the providers, scalability, heterogeneity, and a migration path from currently deployed infrastructure technologies to future network implementations. The resulting infrastructure services are suited to on-demand deployment of emerging cloud services such as content distribution, social networks and cloud-based IT applications.</p
