The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Luca Foschini - One of the best experts on this subject based on the ideXlab platform.
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IMS-Compliant management of vertical Handoffs for mobile multimedia session continuity
IEEE Communications Magazine, 2010Co-Authors: Paolo Bellavista, Antonio Corradi, Luca FoschiniAbstract:The recent advances in wireless client devices and the crucial role of multimedia communications in our society have motivated relevant standardization efforts, such as the IP multimedia subsystem, to support session control, mobility, and interoperability in all-IP next-generation networks. IMS has already driven the design of commercial mobile multimedia, but exhibits limited support for service continuity during Handoffs. In particular, it omits advanced techniques to reduce/eliminate Handoff delays, especially during vertical Handoffs (i.e., change of the wireless technology employed by a client to access the wired Internet, e.g., from UMTS to WiFi). We propose an original solution for session continuity based on the primary design guideline of cleanly and effectively separating the signaling plane (for session reconfiguration via SIP) from the media delivery plane (data transmission and related Handoff management operations). Our optimized Handoff management techniques exploit terminal-based decentralized predictions to minimize service-level Handoff delays. Different from other recent related work, our proposal fully complies with the standard IMS infrastructure and works at the application level. The reported experimental results point out that our solution, available as an open source tool for the IMS community, reduces playout interruption times relevantly by introducing a limited and scalable signaling overhead.
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context aware Handoff middleware for transparent service continuity in wireless networks
Pervasive and Mobile Computing, 2007Co-Authors: Paolo Bellavista, Antonio Corradi, Luca FoschiniAbstract:Advances in wireless networking and content delivery are enabling new challenging provisioning scenarios where a growing number of users access continuous services, e.g., audio/video streaming, while moving among different points of attachment to the Internet, possibly with different connectivity technologies, e.g., Wi-Fi, Bluetooth, and cellular 3G. That calls for novel middlewares capable of dynamically personalizing service provisioning to the characteristics of client environments, in particular to discontinuities in wireless resource availability due to Handoffs. The paper proposes a novel middleware solution, called Mobile agent-based Ubiquitous multimedia Middleware (MUM), that performs effective and context-aware Handoff management to transparently avoid service interruptions during both horizontal and vertical Handoffs. MUM exploits the full visibility of wireless connections available and their Handoff implementations (Handoff awareness), of service quality requirements and Handoff-related quality degradations (QoS awareness), and of network topology and local resource availability (location awareness); that visibility enables MUM to provide original solutions for Handoff prediction, multimedia continuity via adaptive data buffering/pre-fetching, and proactive re-addressing/rebinding.
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application level middleware to proactively manage Handoff in wireless internet multimedia
Lecture Notes in Computer Science, 2005Co-Authors: Paolo Bellavista, Antonio Corradi, Luca FoschiniAbstract:New deployment scenarios tend to consider the requirement of session continuity for service provisioning, especially multimedia streaming, to limited heterogeneous portable devices roaming among wireless localities. In particular, multimedia streaming should not experience any interruption while clients roam in wired-wireless integrated networks based on the standard best-effort Internet. The paper proposes an application-level middleware approach to proactively overcome Wi-Fi Handoff and maintain multimedia session continuity in the wireless Internet by exploiting mobile proxies running on the wired network. Mobile middleware proxies locally support resource-limited clients, avoid packet losses during Handoffs, pre-fetch local buffers with multimedia contents before Handoff occurrence, and possibly reconfigure/renegotiate ongoing sessions after Handoffs. Experimental results show that, notwithstanding the application-level implementation, mobile proxies can avoid streaming discontinuities with good efficiency in wireless-wired integrated networks even if their pro-activity is based on simple and lightweight Handoff prediction techniques.
Paolo Bellavista - One of the best experts on this subject based on the ideXlab platform.
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IMS-Compliant management of vertical Handoffs for mobile multimedia session continuity
IEEE Communications Magazine, 2010Co-Authors: Paolo Bellavista, Antonio Corradi, Luca FoschiniAbstract:The recent advances in wireless client devices and the crucial role of multimedia communications in our society have motivated relevant standardization efforts, such as the IP multimedia subsystem, to support session control, mobility, and interoperability in all-IP next-generation networks. IMS has already driven the design of commercial mobile multimedia, but exhibits limited support for service continuity during Handoffs. In particular, it omits advanced techniques to reduce/eliminate Handoff delays, especially during vertical Handoffs (i.e., change of the wireless technology employed by a client to access the wired Internet, e.g., from UMTS to WiFi). We propose an original solution for session continuity based on the primary design guideline of cleanly and effectively separating the signaling plane (for session reconfiguration via SIP) from the media delivery plane (data transmission and related Handoff management operations). Our optimized Handoff management techniques exploit terminal-based decentralized predictions to minimize service-level Handoff delays. Different from other recent related work, our proposal fully complies with the standard IMS infrastructure and works at the application level. The reported experimental results point out that our solution, available as an open source tool for the IMS community, reduces playout interruption times relevantly by introducing a limited and scalable signaling overhead.
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context aware Handoff middleware for transparent service continuity in wireless networks
Pervasive and Mobile Computing, 2007Co-Authors: Paolo Bellavista, Antonio Corradi, Luca FoschiniAbstract:Advances in wireless networking and content delivery are enabling new challenging provisioning scenarios where a growing number of users access continuous services, e.g., audio/video streaming, while moving among different points of attachment to the Internet, possibly with different connectivity technologies, e.g., Wi-Fi, Bluetooth, and cellular 3G. That calls for novel middlewares capable of dynamically personalizing service provisioning to the characteristics of client environments, in particular to discontinuities in wireless resource availability due to Handoffs. The paper proposes a novel middleware solution, called Mobile agent-based Ubiquitous multimedia Middleware (MUM), that performs effective and context-aware Handoff management to transparently avoid service interruptions during both horizontal and vertical Handoffs. MUM exploits the full visibility of wireless connections available and their Handoff implementations (Handoff awareness), of service quality requirements and Handoff-related quality degradations (QoS awareness), and of network topology and local resource availability (location awareness); that visibility enables MUM to provide original solutions for Handoff prediction, multimedia continuity via adaptive data buffering/pre-fetching, and proactive re-addressing/rebinding.
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application level middleware to proactively manage Handoff in wireless internet multimedia
Lecture Notes in Computer Science, 2005Co-Authors: Paolo Bellavista, Antonio Corradi, Luca FoschiniAbstract:New deployment scenarios tend to consider the requirement of session continuity for service provisioning, especially multimedia streaming, to limited heterogeneous portable devices roaming among wireless localities. In particular, multimedia streaming should not experience any interruption while clients roam in wired-wireless integrated networks based on the standard best-effort Internet. The paper proposes an application-level middleware approach to proactively overcome Wi-Fi Handoff and maintain multimedia session continuity in the wireless Internet by exploiting mobile proxies running on the wired network. Mobile middleware proxies locally support resource-limited clients, avoid packet losses during Handoffs, pre-fetch local buffers with multimedia contents before Handoff occurrence, and possibly reconfigure/renegotiate ongoing sessions after Handoffs. Experimental results show that, notwithstanding the application-level implementation, mobile proxies can avoid streaming discontinuities with good efficiency in wireless-wired integrated networks even if their pro-activity is based on simple and lightweight Handoff prediction techniques.
Takshing Peter Yum - One of the best experts on this subject based on the ideXlab platform.
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the smart Handoff policy for millimeter wave heterogeneous cellular networks
IEEE Transactions on Mobile Computing, 2018Co-Authors: Yao Sun, Gang Feng, Shuang Qin, Yingchang Liang, Takshing Peter YumAbstract:The millimeter wave (mmWave) radio band is promising for the next-generation heterogeneous cellular networks (HetNets) due to its large bandwidth available for meeting the increasing demand of mobile traffic. However, the unique propagation characteristics at mmWave band cause huge redundant Handoffs in mmWave HetNets that brings heavy signaling overhead, low energy efficiency and increased user equipment (UE) outage probability if conventional Reference Signal Received Power (RSRP) based Handoff mechanism is used. In this paper, we propose a reinforcement learning based Handoff policy named SMART to reduce the number of Handoffs while maintaining user Quality of Service (QoS) requirements in mmWave HetNets. In SMART, we determine Handoff trigger conditions by taking into account both mmWave channel characteristics and QoS requirements of UEs. Furthermore, we propose reinforcement-learning based BS selection algorithms for different UE densities. Numerical results show that in typical scenarios, SMART can significantly reduce the number of Handoffs when compared with traditional Handoff policies without learning.
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reinforcement learning based Handoff for millimeter wave heterogeneous cellular networks
Global Communications Conference, 2017Co-Authors: Yao Sun, Gang Feng, Shuang Qin, Yingchang Liang, Takshing Peter YumAbstract:The millimeter wave (mmWave) radio band is promising for the next-generation heterogeneous cellular networks (HetNets) due to its large bandwidth available for meeting the increasing demand of mobile traffic. However, the unique propagation characteristics at mmWave band cause huge redundant Handoffs in mmWave HetNets if conventional Reference Signal Received Power (RSRP) based Handoff mechanism is used. In this paper, we propose a reinforcement learning based Handoff policy named LESH to reduce the number of Handoffs while maintaining user Quality of Service (QoS) requirements in mmWave HetNets. In LESH, we determine Handoff trigger conditions by taking into account both mmWave channel characteristics and QoS requirements of UEs. Furthermore, we propose reinforcement-learning based BS selection algorithms for different UE densities. Numerical results show that in typical scenarios, LESH can significantly reduce the number of Handoffs when compared with traditional Handoff policies.
Mohsen Guizani - One of the best experts on this subject based on the ideXlab platform.
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proactive multipath tcp for seamless Handoff in heterogeneous wireless access networks
IEEE Transactions on Wireless Communications, 2016Co-Authors: Hassan Sinky, Bechir Hamdaoui, Mohsen GuizaniAbstract:Multipath TCP (MPTCP) is a new evolution of TCP that enables a single MPTCP connection to use multiple TCP subflows transparently to applications. Each subflow runs independently allowing the connection to be maintained if endpoints change; essential in a dynamic network. Differentiating between congestion delay and delay due to Handoffs is an important distinction overlooked by transport layer protocols. Protocol modifications are needed to alleviate Handoff induced issues in a growing mobile culture. In this paper, findings are presented on transport layer Handoff issues in currently deployed networks. MPTCP as a potential solution to addressing Handoff- and mobility-related service continuity issues is discussed. Finally, a Handoff-aware cross-layer-assisted MPTCP (CLA-MPTCP) congestion control algorithm is designed and evaluated.
B S Manoj - One of the best experts on this subject based on the ideXlab platform.
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a novel framework for resource discovery and self configuration in software defined wireless mesh networks
IEEE Transactions on Network and Service Management, 2020Co-Authors: Sarath Babu, P V Mithun, B S ManojAbstract:A novel framework is proposed for software defined wireless mesh networks involving mobile switches and controllers operating under in-band control in order to self-configure depending on the network dynamics. Besides the addition/removal of nodes (including switches and controllers) to/from the network in real-time, the problem becomes more challenging for switches to select an appropriate controller from multiple physical controllers. Therefore, first we design a resource discovery scheme to address the dynamic addition and removal of nodes with a software defined optimized link state routing (SD-OLSR) protocol. Apart from resource discovery, SD-OLSR captures the network dynamism and provides a global network view to the controller. Further, two controller Handoff schemes, controller-initiated Handoff (CIH) and switch-initiated Handoff (SIH), are designed for switches to efficiently handover to a suitable controller. The framework and Handoff schemes are tested using a software defined wireless mesh network testbed involving mobile switches and controllers operating under in-band control. The results show that SIH performs better in terms of SDN control overhead and PacketIn-FlowMod delay, while CIH outperforms SIH in terms of the number of Handoffs and controller Handoff time. A fair trade-off between the number of Handoffs and the desired performance metric can be achieved by tuning the Handoff threshold in both CIH and SIH schemes. As an added benefit, our framework provides better load sharing among the controllers in terms of flow-rule requests.
