A service level model and Internet mobility monitor (original) (raw)
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Mobility-aware Management of Internet Connectivity in Always Best Served Wireless Scenarios
Mobile Networks and Applications, 2009
The widespread availability of portable devices with multiple wireless interfaces, e.g., IEEE 802.11, WiMAX, Bluetooth, and/or UMTS, is leveraging the potential of novel supports to seamlessly and automatically select the proper connectivity technology to exploit at any time for any node and any running application. That selection should be context-dependent and take into account several aspects, at very different abstraction layers, from application-specific bandwidth requirements to expected client mobility, from user preferences to energy consumption. We claim the suitability of mobility-aware middlewares to relieve the application logic from the burden of determining the most suitable interface and connectivity provider for each client/application at service provisioning time. In particular, the paper motivates the need for novel context indicators, e.g., client/connector relative mobility, and describes effective lightweight solutions to estimate them flexibly, depending on dynamically introduced evaluation metrics. The paper presents primary architecture and implementation guidelines to build such a novel middleware solution. The proposed middleware has been experimentally validated and the reported performance results demonstrate the feasibility of the approach: it achieves accurate estimations of node mobility and consequently performs connection establishment/selection with very limited overhead.
Service Mobility in Mobile Networks
In the current mobile network architecture, network traffic between user equipment (UE) and services deployed on the public cloud is tromboned towards the anchor point which could lead to network congestion. Deploying services closer to the UE, for example near the eNodeB, is a potential solution. The services are deployed on small scale data centers connected to, or collocated with the eNodeB, called 'eNodeB-Cloud' (eNBC). Mobility of UEs presents a challenge for deploying services in an eNBC. When the UE is handed over from one eNodeB to another, seamless migration of UE context between the service instances running in different eNBCs needs to be ensured. In this paper, we propose a Platform as a Service framework to enable UE context migration between eNBCs. The architecture consists of handover signaling mechanism, TCP session migration technology, context transfer protocol and a set of APIs towards the service. An evaluation of the prototype implementation shows that on an average the time taken to migrate a UE context between two eNBCs is in the order of 12 ms, which is within the limit of handover interruption time between two eNodeBs.
A mobility framework to improve heterogeneous wireless network services
International Journal of Ad Hoc and Ubiquitous Computing, 2011
We propose and investigate the Internet Protocol version 6 (IPv6) enabled mobility framework to improve the user mobility experience in heterogenous wireless networks. The framework considers the traditional IP network infrastructure, IPv6 based mobility support, multihoming, traffic flow transparent handovers and flat/dynamic mobility policy enforcement to guarantee the Quality of Service (QoS) and Quality of Experience (QoE) with ubiquitous connectivity. Using Network Mobility (NEMO) we can provide a flexible network integration mechanism across WiFi, WiMax and UMTS systems vertically. The flexible approach overcomes the limitation of different networks access denial when nodes move using two operations: Policy enforced handover management and Dynamic handover implementation. The paper describes the design rationale behind the solution, introduces an experimental testbed and simulation models, validates mobility related services performance, and discusses our research findings.
On-Demand Service Delivery for Mobile Networks
Support for mobility has become a key requirement for computer networks. Users now expect to be connected at any time and from anywhere. At the network level, this will be done using vertical handover techniques across multiple network technologies. However at the service level there is no agreed mechanism by which to support mobile users. Current service delivery techniques that depend on overprovisioning are no longer valid as they are inefficient in terms of network resource management. Furthermore, mobile users now want access to demanding applications such as multimedia services, i.e., iPlayer, YouTube and 3D-TV. These services often have constraints in terms of bandwidth and latency that need to be properly supported in the mobile environment. This paper outlines the challenges involved in the design of a service delivery model for mobile nodes with high Quality of Service requirements. The proposed approach uses service migration techniques that take into account user mobility and network conditions so as to ensure efficient use of network resources. In this paper, we introduce the novel concept of user clustering to help us decide when and where services should be migrated. We also show how this idea can be used to support a video streaming service.
Mobility Management for Seamless Information Flow in a Heterogeneous Networks
Journal of Computer Science, 2011
Problem statement: In the heterogeneous networks, generally the entire networks operating on the Radio Frequencies under wireless mode available for communication are brought under a single head based on their common operating procedures and functions. As a common mode the basic functions of the networks are requesting, tracing, sending, acknowledging, authenticating, authorizing, receiving, updating, forwarding, controlling, registering, managing. As the radio frequency is considered the signal strength, maximum coverage, power level are taken as the major factor. Approach: Todays cellular network has a wide coverage area and also a good signal strength and as the WiMax is considered the data transmission rate and the volume of information communicated is high. As we consider the Adhoc Network the path tracing and the nearby node identification is faster and there is no need for a standard architecture. As the major of the different networks are combined with certain QoS without disturbing the existing infrastructure a fast seamless flow of voluminous information in real time application can be achieved. As the data transmission is considered the major part is affected based on the initiation & delay such as authentication delay, handover delay, session initiation, activation which is being carried out only after the control had reached the service point. Results: In the proposed study the transmission of information is purely controlled by categorizing the type of information that is being transmitted such as the information ready for transmission is online or offline. Coming to on line either voice communication, Multimedia communication or real-time information transmission. Considering the offline the information is stored file or images. Among the above one the real time video transmission is considered as the major application because delay cannot be permitted and one more thing the mobility should be managed without any break in the transmission path. The rapidly growing demand for "anywhere, anytime" high-speed access to IP-based services is becoming one of the major challenges for mobile networks. Conclusion: As the demand for mobility increases, mobile terminals need to roam freely across heterogeneous networks, posing the challenge of network integration into an All-IP ubiquitous access platform.
Mobility Management in Heterogeneous Access Networks
This thesis proposes, describes and validates solutions to enhance mobility in heterogeneous access networks. Wireless access networks have become available almost everywhere and current research strives to make them pervasive. Users having wireless access to the Internet are driving the demand for mobile and heterogeneous solutions where services could be accessed from anywhere, any time and from any device. Future wireless connectivity will be provided through a mix of coexisting heterogeneous access network technologies. To enhance mobility in heterogeneous networks this thesis focuses on mobility management systems and connectivity of wireless multi-hop ad hoc networks to the Internet. In a wireless environment with overlapping service areas, mobile nodes need to select which gateway(s) to use to access the wireless infrastructure. The metrics used to select the point of attachment within an access technology are insufficient to compare the capacity of different technologies or ...
Multipurpose mobility services for the Future Internet
Computer Networks, 2015
Mobility and handoff management is a key problem of the Future Internet. Current solutions provide mobility services, such as seamless mobility, adaptive mobility, alwaysbest-connected (ABC) mobility, etc. The problem is these services work separately and ignore conflicts between them. This may lead to improve one service and degrade others. Hence, we propose multipurpose mobility as a new holistic service that integrates multiple mobility services and supplies a fair balance between all the objectives to meet. As a proofof-concept, we integrate the seamless, ABC, and adaptive mobility services, which have objectives in conflict. We formulate a Multi-Objective Handoff Optimization Problem, which grades as NP-Hard. We develop a heuristic handoff algorithm, which provides nearoptimal and balanced solutions. Finally, we evaluate the algorithm through random samples of simulated handoff scenarios, which provide hit rates over 90%.
Mobility management for multiple diverse applications in heterogeneous wireless networks
CCNC 2006. 2006 3rd IEEE Consumer Communications and Networking Conference, 2006., 2006
This paper presents a mobility management solution to support both applications who are mobility-aware and those who are not. Mobility management in heterogeneous network environments needs to address the double meaning of the IP address as an endpoint identifier and a location identifier. Application-layer mobility use a non-IP endpoint identifier (e.g. user@realm) while network-layer mobility uses a fixed home IPaddress as endpoint identifier. The resolving of the endpoint identifier to a temporary unicast IP address as location identifier needs support from a mobility management system. This paper proposes a mobility support system that integrates the benefits of application-layer SIP mobility with network-layer MIP mobility. A cross-layer information system provides context for mobility adaptation. Context awareness enhances handover decisions, transport performance and media adoption. The network-layer mobility supports the application to locate the destination ondemand for the initial setup of the sessions. The paper includes an initial evaluation of the network-layer mobility part of the solution.
IEEE Journal on Selected Areas in Communications, 2004
Roaming across heterogeneous wireless networks such as wireless wide area network (WWAN) and wireless local area network (WLAN) poses considerable challenges, as it is usually difficult to maintain the existing connections and guarantee the necessary quality-of-service. This paper proposes a novel seamless and proactive end-to-end mobility management system, which can maintain the connections based on the end-to-end principle by incorporating an intelligent network status detection mechanism. The proposed system consists of two components, connection manager (CM) and virtual connectivity (VC). The CM, by using novel media access control-layer and physical-layer sensing techniques, can obtain accurate network condition, while at the same time reducing the unnecessary handoff and ping-pong effect. The VC can make mobility transparent to applications without additional network-layer infrastructure support using a local connection translation, and can handle mobility well in the network address translator and simultaneous movement cases using a subscription/notification service. The proposed system enjoys several unique advantages: 1) capable of reacting to roaming events proactively and accurately; 2) maintaining the connection's continuity with small handoff delay; and 3) being a unified end-to-end approach for both IPv4 and IPv6 networks. We have built a prototype system and performed experiments to demonstrate the advantages of the proposed system. Index Terms-Mobility management, network condition detection, wireless wide area network (WWAN)/wireless local area network (WLAN) handoff.
Network Layer Mobility: An Architecture and Survey
IEEE Personal Communications, 1996
In this article we explore various network layer concepts that play a crucial role in the design of mobile networking systems. We show that mobility is essentially an address translation problem and is best resolved at the network layer. We describe services that must be supported at the network layer to carry out the task of address translation. Using these service primitives as building blocks, we describe a network-layer architecture which enables smooth integration of mobile end systems within the existing Internet. A summary of some of the key Mobile IP proposals is presented, and it is shown that each proposal can be viewed as a special case of the architecture outlined in this article.