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Sensor networks are expected to be used in hilly and mountainous area. In these usages, the sensor data should be transmitted to receivers in real-time. There are, however, networks where the use of UDP is not permitted. In the case of TCP transmission, transmission of the latest sensor data is delayed by TCP's retransmission control after connection outage recovers. In this paper, we have proposed...
Past work has proven that network coding has great potential to improve network throughput in wireless networks. However, coding-aware routing protocols have weakness regarding delivery of time-sensitive data in lossy links. Nevertheless, the improvement from network coding is negligible when using realtime data delivery. We propose coding-aware real-time routing called CARTR that schedules coded...
Most studies on energy-efficient scheduling of real-time messages ignore buffer constraint, which is not practical in resource-constraint green wireless networks. In this paper, a novel model, Maze(A,D), is proposed to integrate both time-sensitive and buffer-constraint applications in one framework. The energy-efficient message scheduling is formulated as a shortest-curve problem based on the convex...
Industrial wireless WIA-PA is the industrial wireless networking standard which is an emerging and used for process control. Real-time and reliable communication is the most important technical features of industrial wireless network. In this paper, through the analysis of the wireless network for industrial control and network architecture and protocols, combined with industrial wireless networks,...
Security problem poses a great challenge for running mission-critical cyber-physical systems in wireless networks. With the disregard of security factors, existing message scheduling schemes expose critical messages to security threats, especially by confidentiality attacks. Incorporating confidentiality improvement into message scheduling, we investigate the problem of scheduling periodic messages...
The main purpose of this research work is to develop a wireless sensor network system that can continuously monitor and detect cardiovascular disease experienced in patients at remote areas. A wearable wireless sensor system (WWSS) is designed to continuously capture and transmit the ECG signals to the patient's mobile phone. The fastest alert will be issued to doctors, relatives, and hospitals, using...
In this paper we present QOMB, a testbed we designed and implemented for the evaluation of wireless network systems, protocols and applications. The testbed uses the wireless network emulation set of tools QOMET so as to reproduce in a wired network, in real time, the wireless network conditions corresponding to a given scenario. In this context QOMET also provides support for features such as realistic...
Research on wireless sensor networks (WSN) has received considerable attention in the last few years due to their unique characteristics, including, flexibility, self-organization, easy deployment, which make them an ideal candidate for low-cost monitoring. In order to help WSN planning and to enable the design of new protocols and applications and assess their performance, several existent simulation...
The great advances in microelectronics and MEMS (micro-electro-mechanical system) make it possible to design real-time control loops over wireless networks. Real time character is the common request of control systems, multitask is the mainstream of the distributed control system nowadays. Aiming at selecting communication protocol in the wireless networks, the TrueTime toolbox is applied to establishing...
The emergence of high bandwidth public wireless networks and miniaturized personal mobile devices give rise to new mobile healthcare services. To this end, the MobiHealth system provides highly customizable vital signs tele-monitoring and tele-treatment system based on a body area network (BAN) and a mobile health care (m-health) service platform utilizing next generation public wireless networks...
The introduction of wireless networks in the factory floor offers many advantages. Besides a new flexibility for automation, also features like the localisation of wireless devices ease the use of this technology. However, for the application on the factory floor real-time guarantees have to be given, which can be ensured by schemes like TDMA, which is based on implicit or explicit clock synchronization...
In factory communication systems, wireless networks are likely to complement wired automation networks, rather than replacing them. There is therefore an increasing interest in the way wireless and wired systems will interact and form a hybrid network. The hybrid network architecture proposed in this paper specifically addresses WLAN infrastructures in industrial environments. The paper discusses...
Context-aware applications and services require ubiquitous access to context information about the users or sensors such as preferences, spatial & environmental data, available connectivity, and device capabilities. Systems for the brokering or the provisioning of context data via wireless networks do so with centralized servers or by employing protocols that do not scale well with real-time distribution...
Delay requirement becomes a key problem for the time sensitive applications in ad hoc wireless networks. This paper proposes a novel network utility maximization (NUM) model with constrained delay for real-time applications in ad hoc wireless networks. By using dual decomposition techniques, we present a distributed iterative price and rate adaption algorithm which converges to the global optimal...
In recent years, IEEE 802.11 wireless networks become one of the most important components in wireless networks, since compared with other wireless technologies, IEEE 802.11 devices are inexpensive and easier to be configured. To provide seamless roaming in the IEEE 802.11 wireless networks, MAC layer handoff latency should be minimized to support real-time applications. This paper proposes a novel...
Many people, young or old, adult or children live with life-threatening health conditions and deal with frequent visits to the doctor's office or a healthcare facility for blood tests. Blood tests are one of the key processes that aid in examining people's health. Although people with certain illness can check certain blood properties at home without professional help, most people require going to...
In the blood, Lactate is a key element used by the body to produce energy. It is an end product of anaerobic glucose metabolism and plays an important role in the acid-base balance of the body. However, excessive lactate in the muscles is not really good. This study introduces the idea of a wireless, non-invasive real-time monitoring test of blood lactate for athletes during the exercise, for soldiers...
The performance of applications in wireless networks is partly dependent upon the link configuration. Link characteristics varies with frame retransmission persistency, link frame retransmission delay, adaptive modulation strategies, coding, and more. The link configuration and channel conditions can lead to packet loss, delay and delay variations, which impact different applications in different...
In wireless communications networks with multiple service classes (SCs) of calls, call admission control (CAC) schemes is an essential radio resource management (RRM) function for networks consistency. Apart from the calculation of the call blocking probability (CBP) appropriate criteria and metrics should be considered to evaluate the efficiency of various schemes. Fairness among different services...
Traditional rate adaptation solutions for IEEE 802.11 wireless networks perform poorly in congested networks. Measurement studies show that congestion in a wireless network leads to the use of lower transmission data rates and thus reduces overall network throughput and capacity. The lack of techniques to reliably identify and characterize congestion in wireless networks has prevented development...
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