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A Framework for Integrated Routing, Scheduling and Traffic Management (FIRST) in Ad Hoc Networks is introduced. Unicast and multicast routes are established in coordination with the scheduling of transmissions and bandwidth reservations in a way that bandwidth and delay guarantees can be enforced on a per-hop and end-to-end basis. Results from detailed simulation experiments show that, compared to...
Quality of service (QoS) provisioning generally assumes more than one QoS measure which implies that QoS routing can be categorized as an instance of routing subject to multiple constraints: delay-jitter, bandwidth, cost, etc. We study the problem of constructing multicast trees to meet the QoS requirements of real-time interactive applications where it is necessary to provide bounded delays and bounded...
With the growing popularity of video communications in wireless ad hoc network, cross-layer design (CLD) provides a novel technique that can dynamically accommodate its policy to time-varying channel condition and guarantee different Quality of Service (QOS) in real-time video transmission. In this paper, to minimize the distortion of real-time video transmission, we propose a cross-layer optimized...
In the recent years, the use of real-time Ethernet protocols becomes more and more relevant for time-critical networked industrial applications. In this context, this paper presents a method to compute the worst-case packet delays on switched Ethernet. Based on an evaluation of the packet delays at each switch port and the network topology, we construct a weighted directed graph that allows to find...
Increasing transmission power is an effective way to improve real-time data delivery in wireless sensor networks. On the other hand, increased power will also incur more interference though it can improve the link quality to increase real-time communication. So there is a tradeoff between interference and delay. In this paper, we consider a distributed cross-layer routing mechanism to try to find...
Queue scheduling algorithm achieves the assignment of the network resource through scheduling strategy, the reserved bandwidth and delaytime can be guaranteed, then the router select the next packet waiting for forwarding from one or more queues based on some rules, All input network services can share the output bandwidth according to reserved way, to have corresponding resource, and to meet service...
Services composition can reorganize a variety of heterogeneous network services to form new businesses on multi-service streaming media system, which can speed up the development and deployment of new Services. In this paper, a three layer model is used to describe the service composition in a streaming media system. In order to improve the real-time request response performance, service composition...
With network coding, two data packets are transformed into one by a simple XOR-operation. The transformed packet is transmitted and each original packet can be retrieved at its destination node through a similar XOR-operation. Network coding is an important research topic as it radically challenges existing networking paradigms. In this paper we provide an analytical study of the impact network coding...
This paper evaluates the performance of two simple packet scheduling algorithms for real-time traffic in the third generation partnership project long term evolution (3GPP LTE) system. These algorithms, known as Algorithm 1 and Algorithm 2 for this paper, were proposed to support real-time traffic in orthogonal frequency division multiple access (OFDMA) system. Simulation results show that Algorithm...
Delay tolerant networks (DTNs) experience frequent and long lasting network disconnection due to various reasons such as mobility, sleep scheduling, etc. Anycast routing is an important and challenging problem in DTNs. In this paper, we study the single-copy message anycast routing problem in probability-contacted DTNs. We first define a novel metric MDRA (Maximum Delivery Rate for Anycast) to indicate...
Increasing transmission power is an effective way to improve real-time data delivery in wireless sensor networks. On the other hand, increased power will also incur more interference though it can improve the link quality to increase real-time communication. So there is a tradeoff between interference and delay. In this paper, we consider a joint power control, scheduling and real-time routing problem,...
The scope of this paper is to compare existing techniques proposed to manage real time (RT) communications in wireless sensor networks. MAC, network or cross layer solutions are presented and discussed in order to draw up a global view of system designs. Identifying drawbacks of existing works allows drawing future directions concerning QoS guaranteeing data delivery under time constraints.
In this article and as a generalization to our work in Fayza et al. (2003), we present a case study of ATM buffers with batch arrivals, geometric service time and priority scheduling. Packets belongs to two classes, class-1 packets represents real time traffics which is delay sensitive but loss insensitive, and class-2 packets represents non real time traffics which is delay insensitive but loss sensitive...
This paper aims to find the most optimal Grey-Fuzzy routing algorithm within multinomial time about the NP-complete problem of multi-objective optimization QoS routing. With the help of Grey-Fuzzy theory, this algorithm achieves an O(mn) time complexity through integrating the QoS metrics to a Grey-Fuzzy synthetic attribute according to its membership degree and grey degree. Our algorithm can use...
In the following paper, we study the tradeoff between network lifetime and network utility for energy-constrained wireless sensor networks (WSNs) with the real-time requirement. By introducing a parameter r, we combine these two objectives into a single weighted objective, and consider rate control and routing in this tradeoff framework simultaneously. For real-time requirement, we set up real-time...
There are several surveillance and reconnaissance applications of sensor networks (such as military), which require timely and efficient detection of an event (i.e., enemy troops and vehicles). Moreover, the information gathered is then transferred reliably to a sink, located at a remote control station. Incorporation of multimedia data (e.g., image) certainly enhances the functionality and applicability...
As the Internet is rapidly growing and its popularity increases, users tend to use creative, time-conservative, entertained and economical technologies. Real-time applications such as online gaming, voice and video applications are becoming more popular. Research effort to improve scheduling mechanisms in routers is currently given less attention by network researchers. This trend is far behind in...
The interest in solving the issue of congestion or flow control in network established from the first discovery and increase popularity of the Internet in 1967 or earlier. As the use of the network deployed and the popularity increase, the issue grows and the demand for an optimal or tentative solution becomes obvious. Since that time there has been an intensive effort from the scholars and researchers...
In this paper we present an idea for guaranteed performance in real time video communication with error resiliency. The idea carries three main concepts called connection establishment with user defined performance parameters, back pressure re-routing and error resiliency by feedback control. The performance parameters we consider here are time delay and bandwidth. Establishing a connection that gives...
It is becoming increasingly common to connect traditional embedded system networks to the Internet for remote monitoring, high-level control and integration. It is necessary to protect each part of the interconnected system from faults and attacks which propagate from the other side. One architectural approach is to add a gateway to the embedded system to receive Internet traffic and disperse data...
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