Optimal job splitting in parallel processor sharing queues

The main barrier to the sustained growth of wireless communications is the Shannon limit that applies to the channel capacity. A promising means to realize high-capacity enhancements is the use of multi-path communication solutions to improve reliability and network performance in areas that are covered by a multitude of overlapping wireless access networks. Despite the enormous potential for capacity enhancements offered by multi-path communication techniques, little is known about how to effectively exploit this. Motivated by this, we study a model where jobs are split and downloaded over N multiple parallel networks, each of which is modeled as a processor sharing (PS) queue. Each job is fragmented, according to a fixed splitting rule α=

Reliable and Low-Latency Fronthaul for Tactile Internet Applications

With the emergence of Cloud-RAN as one of the dominant architectural solutions for next-generation mobile networks, the reliability and latency on the fronthaul (FH) segment become critical performance metrics for applications such as the Tactile Internet. Ensuring FH performance is further complicated by the switch from point-to-point dedicated FH links to packet-based multi-hop FH networks. This change is largely justified by the fact that packet-based fronthauling allows the deployment of FH networks on the existing Ethernet infrastructure. This paper proposes to improve reliability and latency of packet-based fronthauling by means of multi-path diversity and erasure coding of the MAC frames transported by the FH network. Under a probabilistic model that assumes a single service, the average latency required to obtain reliable FH transport and the reliability-latency trade-off are first investigated. The analytical results are then validated and complemented by a numerical study that accounts for the coexistence of enhanced Mobile BroadBand (eMBB) and Ultra-Reliable Low-Latency (URLLC) services in 5G networks by comparing orthogonal and non-orthogonal sharing of FH resources.Comment: 11pages, 13 figures, 3 bio photo

Secure Mobile IP with HIP Style Handshaking and Readdressing

Mobile IP allows the mobile node roaming into a new IP network without losing its connection with its peer. Mobile IPv6 is using Mobile IP with Route Optimizationto improve performance by avoiding the triangle routing and adopting Return Routability as a secure process for binding update. Host Identity Protocol (HIP) is an experimental security protocol which provides mobility management and multi-homing by its new namespace. Its architecture is similar to that of Mobile IP with Route Optimization. In this paper, we have introduced a Secure Mobile IP with HIP Style Handshaking and Readdressing (SMIP), which has stronger security, better performance and lower binding cost in binding update process compared with Mobile IPv6. The dependence of home agent in the new scheme is also shown dramatically decreased. The initiated scheme integrated the primary features of two completely different mobility management solutions and has set up a migration path from mobile-IP based solution to a public-key based solution in mobile IP network

Streaming video using cooperative networking

Title from PDF of title page (University of Missouri--Columbia, viewed on September 10, 2010).The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file.Dissertation advisor: Dr. Wenjun Zeng.Vita.Ph. D. University of Missouri--Columbia 2009.The main objective of this dissertation is to improve the overall video streaming performance in various networking environments, such as IP-multicast in wired network and wireless mesh networks (WMNs), using cooperation among participants including clients and routers. We investigate a number of key challenging issues associated with video streaming, and we explore solutions to those issues using a cooperative networking approach, which includes constructing overlay Peer-to-Peer (P2P) retransmission networks and exploring hybrid architecture of content distribution networks (CDN) and P2P networks. To solve the reliability issue in IP-multicast, we propose a novel overlay P2P retransmission architecture to exploit path diversity. An approach that leverages both disjoint path finding and periodic selective probing to take into account peer's recent packet loss probability, retransmission delay and recent retransmission performance is proposed to effectively construct an efficient and dynamic overlay peer retransmission network. To improve the video streaming quality over WMNs, we design a Unified Peer-to-Peer and Cache (UPAC) framework for high quality video on demand services over infrastructure multi-hop WMNs. In this framework, mesh routers work cooperatively with mesh clients to construct a CDN and P2P hybrid structure to improve the QoS of video streaming. We present a series of solutions to address the key challenges in video streaming over WMNs, i.e., the design of a new high throughput routing metric, a new enhanced routing algorithm, a cross-layer server and path selection strategy, a novel admission control algorithm with per-flow routing and a new P2P structure for video streaming. Simulation results show that the proposed UPAC framework can utilize the capacity of WMNs better than existing approaches and improve the video streaming quality over WMNs significantly.Includes bibliographical reference

A Survey on the Contributions of Software-Defined Networking to Traffic Engineering

Since the appearance of OpenFlow back in 2008, software-defined networking (SDN) has gained momentum. Although there are some discrepancies between the standards developing organizations working with SDN about what SDN is and how it is defined, they all outline traffic engineering (TE) as a key application. One of the most common objectives of TE is the congestion minimization, where techniques such as traffic splitting among multiple paths or advanced reservation systems are used. In such a scenario, this manuscript surveys the role of a comprehensive list of SDN protocols in TE solutions, in order to assess how these protocols can benefit TE. The SDN protocols have been categorized using the SDN architecture proposed by the open networking foundation, which differentiates among data-controller plane interfaces, application-controller plane interfaces, and management interfaces, in order to state how the interface type in which they operate influences TE. In addition, the impact of the SDN protocols on TE has been evaluated by comparing them with the path computation element (PCE)-based architecture. The PCE-based architecture has been selected to measure the impact of SDN on TE because it is the most novel TE architecture until the date, and because it already defines a set of metrics to measure the performance of TE solutions. We conclude that using the three types of interfaces simultaneously will result in more powerful and enhanced TE solutions, since they benefit TE in complementary ways.European Commission through the Horizon 2020 Research and Innovation Programme (GN4) under Grant 691567 Spanish Ministry of Economy and Competitiveness under the Secure Deployment of Services Over SDN and NFV-based Networks Project S&NSEC under Grant TEC2013-47960-C4-3-

Test Bed for Multipath TCP

It was a common assumption on the Internet that endpoints access the network through only one interface. But now, most mobile devices support several access technologies and can have several IP interfaces. This diversity can be used to improve network performance. Traditional protocols do not support multi-access thus new solutions have to be deployed. This thesis explores the use of MultiPath TCP as a solution to take advantage of multiple interfaces on mobile endpoints. It considers more specifically the case of devices that support several 3G subscriptions. MPTCP can use several interfaces concurrently but it raises a problem of power consumption. Dynamic interface selection is proposed as a way to make a tradeoff between performance and battery life. To evaluate the performance of MPTCP and the different path selection algorithms in real world conditions, this work included the design and implementation of a test bed based on a laptop and three mobile phones. The results showed that MPTCP with or without interface selection can improve the performance of TCP connections on multihomed endpoints

Multi-layer virtual transport network management

Nowadays there is an increasing need for a general paradigm which can simplify network management and further enable network innovations. Software Defined Networking (SDN) is an efficient way to make the network programmable and reduce management complexity, however it is plagued with limitations inherited from the legacy Internet (TCP/IP) architecture. In this paper, in response to limitations of current Software Defined Networking (SDN) management solutions, we propose a recursive approach to enterprise network management, where network management is done through managing various Virtual Transport Networks (VTNs) over different scopes (i.e., regions of operation). Different from the traditional virtual network model which mainly focuses on routing/tunneling, our VTN provides communication service with explicit Quality-of-Service (QoS) support for applications via transport flows, and it involves all mechanisms (e.g., addressing, routing, error and flow control, resource allocation) needed to support such transport flows. Based on this approach, we design and implement a management architecture, which recurses the same VTN-based management mechanism for enterprise network management. Our experimental results show that our management architecture achieves better performance.National Science Foundation awards: CNS-0963974 and CNS-1346688