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As the increase of data traffic is expected to grow faster than wireless capacity, dealing with congestion is unavoidable in the future. The capacity imbalance between wired and wireless links leaves a bottleneck on the wireless link while traffic keeps coming in through the bigger pipe. In current systems, the dynamics of a wireless channel and the variations in the higher priority real time traffic...
This paper presented a fast fasten control algorithm (2FCA) in wireless sensor networks for information processing and transmitting. Using anycast technology, 2FCA can fast fasten broken routing path, which will decrease failure delay and increase packets' success rate. In the algorithm, it restricts participant nodes to save scarce energy and bandwidth resource, and then prolongs network's lifetime...
A data aggregation preprocessing algorithm for congestion control in wireless sensor networks is proposed in this paper. The algorithm decrease the repeating packet of nodes by reducing data of multiple group sensing data which belongs to a aggregation cycle with similar coefficient, thus can ease congestion of the networks. The experimental results show that this algorithm can reduce communication...
Wireless Sensor Network (WSN) is widely used in Emergency Management System (EMS) to assure requirement of safety in current society. For centralized management, it is difficult for conventional systems to assure the real-time transmission of emergency information under rapidly changing situations. Thus, based on the Autonomous Decentralized Community (ADC) concept the main route for emergency information...
Wireless sensor networks can be used to deploy various applications to reflect the circumstance of environment. Video sensors used in wireless multimedia sensor networks (WMSNs) enhance such applications with multimedia data, but with specific characteristics requirement for the network. The aim of this work is to provide reliable data transport with multipath routing and load balancing congestion...
In this paper, we perform a detailed study of the Binary Exponential Back-off Algorithm (BEBA) that is widely used in distributed MAC protocols to avoid collision when more than one machine try to access the medium in ad hoc network at the same time. We begin with a generalized framework of modeling of BEBA. Then we identify a key difference between BEBA and the commonly assumed p-persistent model...
In this paper, we deal with a cross-layer optimization problem in Ad Hoc networks. Based on network utility maximization framework, we formulate the joint congestion and power control problem providing SINR guarantee and energy saving. We adopt dual decomposition technique to deduce two maximization sub problem, and then design the optimal distributed congestion control algorithm at the transport...
We discuss protocols for all-to-all dissemination in ad-hoc wireless networks. We identify shortcomings and challenges related to high traffic and explore their causes by observing the performance at the MAC layer. Through simulations we show that a congestion assessment mechanism can reduce more than 1/4 of the traffic on a good part of the nodes without affecting dissemination performance. We conclude...
The possibility of distributing data to all interested entities connected to a mobile system is a fundamental core function in future mobile ubiquitous class based applications. Unfortunately, its realization poses many problems especially due to the typically scarce resources. With the goal of enhancing scalability, this paper presents a novel data distribution infrastructure for wireless mobile...
Vehicle-to-Vehicle (V2V) communications play a critical role in enabling important cooperative safety applications. V2V safety communications rely on broadcast of self-state information (e.g., position, speed, and heading) by each vehicle, which allows a vehicle to track its neighboring vehicles in real-time. One of the most pressing challenges in this research is to maintain an acceptable tracking...
Low-power Wireless Networks (LWNs) have become increasingly available for mission-critical applications such as security surveillance and disaster response. In particular, emerging low-power wireless audio platforms provide an economical solution for ad hoc voice communication in emergency scenarios. In this paper, we develop a system called Adaptive Stream Multicast (ASM) for voice communication...
This paper investigates the benefits and drawbacks of repeating controlled flooding at different time intervals in mobile ad hoc networks (MANETs) to overcome episodic connectivity. Specifically, we examine the efficiencies in repeating transmissions by quantifying the packet delivery ratio (PDR) and recording the resulting delays in different types of MANET scenarios. These scenarios focus on the...
The MIL-STD-188-220 is the military tactical wireless mobile ad-hoc communication standard which makes a smooth data and voice communication possible. This standard is known as the Interoperability Standard for Digital Message Transfer Device Subsystems. However, the standard has the problem to generate the meaningless traffic due to the failure of topology update, in the case of transmitting the...
A critical challenge for data transmission over wireless mesh networks (WMNs) is congestion control. In this paper, we explicitly describe a congestion control protocol for data transmission in WMNs, which supports high-speed data transmission and satisfies both the objectives of efficiency and fairness of flows without decreasing throughput of the networks. We demonstrate this protocol on our developed...
The available bandwidth information is important to the admission control, channel scheduling and other schemes; moreover, it is an important parameter to evaluate the quality of service in Mobile Ad Hoc network. With analysis of the difference between bandwidth estimation scheme in wired network and wireless network, the available bandwidth in Mobile Ad Hoc network is defined. The factors which infect...
Sensor networks are consisting of sensor nodes with limited battery power and wireless communication modules on it. They are deployed to collect the useful information from the field. Topology control is very critical to operate the sensor network for a long period of time. When being deployed, ad-hoc and sensor networks are unstructured and lack an efficient and reliable communication scheme. For...
IEEE 802.11p provides a communication standard for Wireless Access in Vehicular Environment (WAVE), including both safety and non-safety communications. Safety-related communications can be from either event-driven or periodic-driven requests. The event-driven messages usually convey emergency information and, hence, are more critical than periodic-driven messages. IEEE 1609.3 specifies the operations...
Situations that need quick responses, just like monitor of enemy in battlefield or emergency preparedness, the quick response to large amounts of datas bring great challenges to traditional wireless sensor network routing protocol. Most of the routing protocols use a static cluster head node to collect datas from the entire network, resulting in large communication capacity around the cluster head...
Broadcast storm problem and congestion question can be found in the routing protocol DSR when we research on the routing protocol of wireless Mesh network. In this paper an advanced routing protocol was proposed, it improved DSR by transmitting the packets based on the distance threshold and congestion threshold. The simulation results show that the improved routing protocol has bigger throughput...
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