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Mobile operators are today facing the daunting challenge of providing cheap and valuable services to ever more demanding customers. As a matter of fact, mobile standards have not yet really addressed this expectation of open, cheap and flexible web oriented internet access. As an alternative, we introduced an IP-centric QoS model mainly inspired by IP policies commonly found in fixed networks. In...
Industrial Ethernet is the movement of industrial control network systems. In order to have an overall understanding of industrial Ethernet for the readers, the paper introduces the development of industrial Ethernet. Then further state the mainstream technology of industrial Ethernet in detail. And finally, discuss the development trend of industrial Ethernet and summarize all the paper.
There is an unfairness between long-term TCP flows and short-term TCP flows because of the single queue and first-in-first-out scheduling algorithm in access point (AP) in WLAN. This paper suggests a priority scheduling algorithm. In the algorithm AP maintains one queue with a timer for each TCP flow. The scheduled orders of queues are based on values of timers. Network Simulator (NS) is used to simulate...
Voice over IP is an effective technology to reduce communication fee between people by means of the Internet. However, the quality of communication in the Internet is still a major challenge to real-time voice communication, such as excessive delay, packet loss, and high delay jitter, all these impair the communication quality. In order to improve the quality of communication between Voice Communication,...
In recent years, the video streaming service has become one of the most important applications. The rapid growth of users raises a big challenge to the traditional client-server VoD service. In order to provide large scale VoD service with lower server bandwidth cost, P2P technology has been introduced to VoD service. P2P based VoD service provides the same user experience as the client-server mode...
This paper presents the system architecture designed by the ICT FP7 OPTIMIX project to enable enhanced multimedia streaming in a point to multi-point context on wireless heterogeneous systems. The peculiarity of the OPTIMIX system is the introduction of new control blocks, i.e., controllers and observer, to efficiently handle the optimization of the multimedia transmissions. The controllers, by collecting...
Controller area network (CAN) is widely used in real-time automobile control and is gaining wider acceptance as a standard for automotive networking. The applicability of earliest deadline (EDF) techniques to the scheduling of CAN messages has been shown in previous researches. Earliest deadline can guarantee higher network utilization than fixed-priority schemes like deadline or rate monotonic (DM,...
Recent Internet traffic measurement shows that the majority of the TCP flows are short lived. Use of short flow highest priority scheduling provides the performance improvement in the internet traffic. However, long lived flows competing against the short flows starve at some point. We propose a novel two class Queue State Packet Scheduling mechanism, namely QSPS which treats long flows fairly without...
Peer-to-peer (P2P) technology has become as a promising scalable solution to offer high-quality streaming multimedia to a large number of consumers at reasonable cost. Many existing systems have been deployed based on IPv4 network environment [1], [2]. IPv6 protocol has been seemed as a core component in Next Generation Internet (NGI) and the P2P streaming scheme which can be implemented in a IPv4...
IPSec VPN is commonly used to implement secure communications between different branch intranets over public networks. Multi-link aggregate IPSec VPN can make better use of multiple physical links of corporation. On the basis of analysis on the insufficiency of packet-based scheduling, a session-based tunnel scheduling model for multi-link aggregate IPSec VPN is proposed. The new model can distribute...
Wireless mesh networks (WMNs) are emerging as a promising technology for backhauling data traffic from wireless access networks to the wired Internet. Such networks are expected to support various types of applications with different quality of service (QoS) requirements. In this paper, we provide a complete cross-layer solution for WMNs together with its OPNET simulation architecture that comprises...
The mechanisms and design principles needed for achieving optimized handoff for mobile Internet services are poorly understood and need better analysis. This paper contributes to the general theory of optimized handoff and addresses the need for a formal model that can characterize a mobility event and the associated mobility optimization methodologies. It provides a systematic and formal approach...
In Peer-to-Peer (P2P) networks if adversaries such as Sybil attackers have got most identities in the network, they will control routing table or traffic. In this paper, we propose a framework based on two complementary techniques to defense malicious node after they transmit data to other malicious peers instead of honest peers. The first approach, based on behaviors of destination nodes, is used...
A large-scale distance learning system named IPv6-class for IPv4/IPv6 hybrid environment is modeled in this paper. IPv6-class can work not only in IPv4 or IPv6 networks, but also in the IPv4/IPv6 hybrid networks. Key issues of IPv6-class, MCU served as the gateway in IPv6/IPv4 hybrid networks, including protocol conversion and queue scheduling, are discussed in details. IPv6-class has already been...
This paper presents a novel video service system DCSVS (distributed collaborative set-top-box video service), which encompasses several practical and effective solutions to both live and VoD (video-on-demand) services. DCSVS is established on an overlay DHT (distributed hash table) network, which improves Kademlia protocol to fit for real-time application. We use several types of pre-fetching to enhance...
The most important desidered characteristic for today's networks is quality of service (QoS). Currently DiffServ-based MPLS networks are able to the development of efficient methods for QoS provisioning. This article analysis, through computer simulation, the performance of WFQ schedulers in a DiffServ node loaded by long range dependence (LRD) traffic. The adopted process for the traffic generation...
A distinguishing feature of the universal mobile telecommunications system (UMTS) is the support of different levels of quality of service (QoS) as required by subscribers and their applications. To provide QoS, the UMTS backbone network needs an efficient QoS mechanism to provide the demanded level of services on UMTS network. A model to investigate end-to-end quality of service (QoS) provisioning...
The Internet protocol (IP) plays a dominant role in current networking technologies and the wavelength division multiplexing (WDM) technology provides tremendous bandwidth. The IP-over-WDM is becoming the right choice for next-generation Internet networks where optical burst switches (OBS) is a promising technique to bridge the gap between IP and WDM. However, traditional OBS scheduling algorithms...
This paper proposes a novel control methodology for remote mobile robot control over a network via middleware. The controller output is adapted via middleware with respect to current network traffic conditions. The middleware can be implemented in a modular structure. Thus, a controller upgrade or modification for other types of network protocols or different control objectives can be achieved easily...
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