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FlexRay protocol has been developed as the de-facto industry standard for next generation in-vehicle communication with high bandwidth, time-triggered architecture and dual-channel redundancy. However, it does not define a mechanism to handle the transient errors, which is frequent on the common-used twisted wire cable. Thereby, FlexRay is hindered for the application in safety-critical communications...
In this paper, we develop a mathematical model of a load control mechanism for SIP server signaling networks based on a hysteretic technique. We investigate loss-based overload control, as proposed in recent IETF documents. The queuing model takes into account three types of system state — normal load, overload, and discard. The hysteretic control is made possible by introducing two thresholds, L...
A framework for the joint design of wireless network and controllers is proposed. Multiple control systems are considered where the sensor measurements are transmitted to the controller over the IEEE 802.15.4 protocol. The essential issues of wireless networked control systems (NCSs) are investigated to provide an abstraction of the wireless network for a co-design approach. We first present an analytical...
Multi-hop broadcast routing is a critical component in ad-hoc wireless networks. Vehicular ad-hoc network (VANET) applications for example use broadcast communications extensively. Efficient broadcast protocols are required to enable these applications. Multi-hop broadcast algorithms can roughly be classified as either topological or statistical. Statistical protocols are well-suited to applications...
Joint optimization of network coding and Aloha-based medium access control (MAC) for multi-hop wireless networks is considered. The multicast throughput is maximized subject to flow conservation and MAC achievable rate constraints to obtain the optimal transmission probabilities. The resultant optimization problem is inherently non-convex and hence difficult to solve even in a centralized manner....
The Path Computation Element (PCE) is a network entity utilized for network path computation operations, especially useful in optical networks based on wavelength division multiplexing (WDM). In the PCE paradigm, the communication between a node and the PCE is specified by the Path Computation Element Communication Protocol (PCEP). According to PCEP protocol, multiple LSP (Label Switched Path) requests...
In the recent few years, the UFH RFID systems which work in the frequency range between 860MHz and 960MHz have been widely adopted in real deployments and applications, and accordingly the EPC Gen-2 protocol is proposed as an international standard to resolve the tag collisions occurred in such system. In this paper, based on the stochastic distribution model established to analyze the collision resolution...
The main design challenge in wireless sensor networks is to achieve satisfactory network lifetimes under scarce energy resources available at the nodes. In this paper we present an optimization framework for maximizing lifetime of a network in which opportunistic routing together with random linear network coding is used. We propose a scheme in which each node attempts to receive transmissions from...
In Wireless Sensor Networks (WSNs), stochastic reliable transmission protocols, which improve reliability of the delivery process by transmitting redundant packets, have been proved to have advantage of energy efficiency over the retransmission one. But the burst and deep fading characteristic of the error prone wireless links in WSNs reduces the practicability of this kind of protocols. To solve...
In this paper, we jointly optimize the position of the relay node and transmission power ratio of the source node over the relay node to minimize the outage probability, which can provide guidance for IEEE 802.16j transparent relay node configuration. The result indicates that the outage probability is minimum when the relay is positioned at the midway between the source and the destination, and the...
In this paper, we investigate resource allocation for decode-and-forward (DF) opportunistic cooperative networks, where the availability of the direct link between the source and the destination has been taken into consideration. In addition to separate power allocation and location optimization, we also consider joint resource allocation to minimize the outage probability. Under Rayleigh fading channels,...
The performance of applications is influenced by the way its operations are grouped into global transactions. This in turn influences the performance of business processes which utilize these applications as implementations of process activities/steps. Stratified transactions, as produced by the stratification approach presented in this paper, is a way to manage a global transaction by combining the...
On the analysis of failure and deterioration model of aeroengine, Markov decision process (MDP) based multi-agent framework was introduced to overcome the obstacles of conventional maintenance policy optimization of aeroengine. In the design phase, maintenance ontology was defined to smooth the communication among agents. Then the system architecture and agent interaction mechanism were described...
In cooperative networks, some of the users in neighborhood of the source relay the source information, in order to combat the effects of multipath fading. Recent investigations, on multirelay amplify-and-forward cooperative networks, have shown that a significant performance improvement will be obtained, if the phase information of the channel between relays and destination are feedback to the relays...
The downsizing of transistor dimensions enabled in the future nanotechnologies will inevitably increase the number of faults in the complex ULSI chips. To maintain the production yield at acceptable level, several levels of protection mechanisms will have to be implemented to tolerate the permanent and transient faults occurring in the physical layers. In this paper, we study fault tolerance at the...
In this paper, we deal with the amplify-and-forward (AF) cooperative strategy in slot-based block-fading environments. In contrast with previous schemes which assume a constant channel during the cooperative frame (several slots), here, we relax this constraint and assume a classical quasi-static block-fading channel (constant for one slot). This additional degree of freedom modifies the behavior...
In this paper we present a partially asynchronous, fully distributed flow-based access scheme for slotted-time protocols, that guarantees proportional-fairness in ad hoc wireless networks. This problem of providing fairness in wireless networks is considered in the framework of non-linear optimization. We say a medium access control algorithm is proportionally fair with respect to individual end-to-end...
In this paper, we propose a cross-layer optimization approach that exploits retransmission diversity in wireless CDMA communications. Conventionally, data packets that are not correctly detected are usually dropped. These dropped packets can be used to help data packet detection. By exploiting all the retransmitted packets, data packets can be correctly detected with higher probability. The proposed...
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