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In this paper, we propose a cooperative media access control (CMAC) protocol to improve the packet reception ratio and to reduce the average delay for multi-hop transmission. The proposed protocol shows better packet delivery ratio and less delay than the IEEE 802.11p MAC protocol for multi-hop transmission.
Recently, a number of transport and application layer protocols for haptic and Interactive applications have been proposed. This paper presents a survey of the above protocols. It outlines the haptic data transmission characteristics. It also depicts the qualitative features that transport and application layer protocols should contain in order to carry haptic data. Based on these criteria, evaluation...
Tactical mobile ad hoc networks have a hierarchical organization with soldiers reporting to their group leader and from them to the command center. In such a network, it is important to prioritize the traffic associated with the leaders without starving other essential communication in the network. To support such a feature, we propose a hybrid routing protocol, named as “Rank-aware Tree-based Geographical...
We propose a connectivity-based routing protocol (named CRP) for underwater wireless sensor networks (UWSNs). CRP considers the reliability issue due to high error rate in UWSNs. Hence, during forwarding, a node with the highest connectivity to the sink is selected as a next forwarding node. Using the NS-2 simulator, CRP is compared against a localization-free routing protocol in UWSNs (i.e. H2-DAB)...
In this paper, we propose a modification of the observe extension of CoAP to include Quality of Service (QoS) support for timeliness. The proposed QoS support is based on delivery priority. Nodes are able to express the priority order with which they wish to be notified. Furthermore, they are also able to specify which notification they want to receive. We classify the notifications in two categories:...
Inter-vehicle communication is considered as a major problem to vehicular environment. Here, an analytical framework is developed to investigate the reliability of end-to-end information relay process along a platoon of vehicles. The reliability of inter-vehicle communication is measured by the probability of success for information to travel to a known destination and by the required number of hops...
This paper presents an easy to design Physically Unclonable Function (PUF). The proposed PUF implementation is a loop composed of identical and controllable delay chains which are serially assembled in a loop to create a single ring oscillator. The frequency discrepancies resulting from the oscillator driven by complementary combinations of the delay chains allows to characterize one device. The...
In the view of the large scale and increasing kinds of service of space information networks, a service- oriented topology control algorithm is proposed. According to demands of existing service, the topology of network is divided into several logical sub-topologies, on which construct the corresponding topology. Taking the communication pattern as an example, the augmentation-based approach is adopted...
Data dissemination in vehicular ad hoc networks (VANETs) has recently received considerable attention. Due to the unique characteristics of VANET, the implementation of reliable data dissemination among vehicles has encountered many challenges. In this paper, a reliable and efficient data dissemination scheme is presented. Relative locations between neighbor vehicles are predicted to improve delivery...
Genetic algorithm (GA) has been widely used in a variety of communication network design problems. The encoding method is the essential issue for GA. In this paper we investigate the topology optimization of the tree-like overlay multicast systems with degree constraints. A new encoding method based on the degree-weighted array is proposed. It requires no repair strategies for the encoding, crossover...
Nowadays implementation of TCP and UDP protocols offer high speed and reliability on data links. Especially TCP implementations offer high speed rates, employing sliding window and data acknowledgement in TCP protocol. On the contrary, UDP offers different options and has other advantages and disadvantages. But in certain environment, especially with high delay and high bit error rate, these protocols...
With deeply scaled CMOS technology, Bias Temperature Instability (BTI) has become one of the most critical degradation mechanisms impacting the device reliability. In this paper, we present the BTI evaluation of a single inverter gate covering both the PMOS and NMOS degradations in a workload dependent, atomistic trap-based, stochastic BTI model. The gate propagation delay depends on the gate intrinsic...
We present a solution to evaluate the performance of transport protocols as a function of link layer reliability schemes (i.e. ARQ, FEC and Hybrid ARQ) applied to satellite physical layer traces. As modelling such traces is complex and may require approximations, the use of real traces will minimise the potential for erroneous performance evaluations resulting from imperfect models. Our Trace Manager...
Network coding techniques have absorbed much attention for providing reliable broadcasting services in wireless networks. However, the intrinsic tradeoff among throughput, decoding delay, and feedback overhead has obstructed the application of the previously proposed schemes in practice. In this paper, we firstly propose a rate-controlled network coding scheme (RANC), which can effectively reduce...
Intelligent transport systems provide a multitude of possibilities when it comes to increasing traffic safety on our roads. Many of the proactive traffic safety applications under development today demand timely and reliable treatment of deadline dependent data traffic. Unfortunately it is not possible to provide any timing guarantees when using the current IEEE 802.11p standard for wireless access...
End-to-End transport protocols can not provide satisfying communication service in interplanetary backbone networks because of the long propagation delay and high BERs characteristics. This paper proposed a renovation protocol based on hop-by-hop Acknowledgment against the traditional end-to-end protocols for interplanetary backbone networks, which used Hop-by-Hop SNACK and End-to-End SNACK to ensure...
With the increase of the number of wireless sensing or metering devices, the collection of sensing data using wireless communication becomes an important part of many applications. Cognitive radio technology can be used to facilitate the deployment of a bandwidth efficient sensor system. In this paper, we propose a data collection and dissemination framework for cognitive radio sensor systems to fully...
Nowadays, due to wide applicability of Wireless Sensor Network (WSN) added by the low cost sensor devices, its popularity among the researchers and industrialists are very much visible. A substantial amount of works can be seen in the literature on WSN which are mainly focused on application specific WSN considering its resource constraints, neglecting the return-of-investment and usefulness of the...
Context-awareness is a key requirement in many of today's networks, services and applications. Context Management systems are in this respect used to provide access to distributed, dynamic context information. The reliability of remotely accessed dynamic context information is challenged by network delay, packet drop probability, information dynamics and the access strategies taken. QoS classification...
The lifetime of wireless sensor networks (WSNs) is an important issue of much recent researches. A practical and widely used approach to prolong the lifetime of WSN is multi-mode protocols in which the sensor nodes are switched between active and sleep modes. But there is no work so far to study the multi-mode structures from reliability viewpoint. In this paper two terminal reliability of WSN is...
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