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Cognitive Radio ad hoc network is a sort of wireless network. Cognitive radios have the ability to sense the wireless medium. Routing is the major research area and ensuring quality-of-service (QoS) is a challenging problem. This paper proposes a neighbor node discovery mechanism based delay aware routing protocol in order to provide QoS in such network. Primary QoS metrics such as throughput and...
In wireless Media Access Control (MAC) environment, management of channel access and controlling of packet transmission is done via shared channel in a distributed way. MAC protocols objectives for Wireless Network is to maximize channel utilization and minimizing channel access delay. It is MAC protocol's responsibility to provide best possible utilization of provided bandwidth while fulfilling the...
We present Duo-MAC, an asynchronous cascading wake-up scheduled MAC protocol for heterogeneous traffic forwarding in low-power wireless networks. Duo-MAC deals with energy-delay minimization problem and copes with transmission latency encountered by Today's duty-cycled protocols when forwarding heterogeneous traffic types. It switches, according to the energy and delay requirements, between Low Duty...
With rapid development of microelectronics and low-cost cost multimedia hardware, Wireless Sensor Networks (WSNs) have started to evolve into Wireless Multimedia Sensor Networks (WMSNs), where the emphasis is given on acquisition, processing and transmission of multimedia content through WSN. While the idea of multimedia sensor networks has been existing for some time, very little research is performed...
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:...
The Wireless Multimedia Sensor Networks (WMSN) are confronted with two basic constraints that are the strong constraint of the energy consumption, and the strong constraint of the traffic performance (Delay, Throughput, etc.). To try to satisfy these two constraints, the IEEE 802.11e Enhanced Distributed Channel Access (EDCA) has been used at the MAC layer in the WMSN. The EDCA access method maintains...
In hierarchical networks, nodes are separated to play different roles such as CHs and cluster members. Each CH collects data from the cluster members within its cluster, aggregates the data and then transmits the data to the sink. Each algorithm that is used for packet routing in quality of service (QoS) based applications should be able to establish a tradeoffs between end to end delay parameter...
Energy consumption in wireless sensor networks (WSN) was always a basic constraint to respect. But, with the appearance of Wireless Multimedia Sensor Networks (WMSN), another basic constraint comes from added, which is the traffic performance in terms of delay, throughput, and Packet Delivery Rate (PDR). The choice of channel access method can help us to better respond the two constraints in WMSN...
There has been much interest recently in improving power saving and cost efficiency by monitoring the operation status of various facilities over networks. Wireless networks, especially cellular networks, are advantageous in terms of their mobility, coverage, and scalability. However, a weak point is their low reliability due to rapid changes in available bandwidth. We fabricated a prototype of a...
In this paper, an energy-efficient, distance-aware and QoS-guaranteed multi-path routing (EDQMR) protocol for WVSNs is proposed. The routing selecting and updating algorithm is designed under comprehensive consideration of the hop count, delay, the distance between hops and energy information. The path of the largest minimum residual node energy is used as an alternate path to increase the network...
The mine accident occurs so frequently. The reliability and Quality of Service (QOS) of underground emergency rescue communication system have decisive function on the rescue achievements. This article brings forward to apply 802.11EDCF protocol in MAC layer to underground emergency rescue communication system by analyzing the influence of 802.11 DCF to QOS system which is based on 802.11b/g network...
Wireless Multimedia Sensor Network (WMSN), as a novel technology, has attracted more and more attention with its board applications nowadays. The paper discusses the major challenges in current WMSN and focusing on some protocols relatively better fitting in the requirement of WMSN. Then a novel routing protocol CBRP-L basing on Cluster-Based Real-time Routing Protocol (CBRP) is proposed in this paper,...
In this paper, a differentiated services based congestion control algorithm for Wireless Multimedia Sensor Networks (WMSNs) is proposed. Keeping in mind the characteristics of Wireless Sensor Networks (WSNs) and their possible extensions, the proposed algorithm categorizes WMSNs traffic into six different classes. The algorithm takes a novel and different approach towards congestion control in WMSNs...
Wireless Sensor Networks (WSNs) comprise of groups of tiny sensor nodes that are deployed for collaborative missions such as environmental monitoring, target tracking and surveillance. Due to the miniature size of the nodes, they are typically deployed in large numbers and communicate via multiple hops through a wireless shared communication channel. The successful implementation of such networks...
Our earlier embedded QoS-aware residential gateway (EmQRG) for real-time class-based queuing (CBQ) bandwidth management is reviewed and experimentally demonstrated. EmQRG's high QoS is demonstrated in conjunction with a wireless ZigBee network of temperature/humidity monitoring sensors. Critically, the EmQRG sends a top-priority over-temperature alarm when any temperature/humidity module reports a...
Currently, the wireless sensor networks QoS is confronted with many challenges. Wireless sensor networks has many characteristics, such as basing on the data, and facing application and dynamic characteristics. This paper emphatically analyzes the description of wireless sensor networks QoS and its QoS evaluation method. Then quantize the QoS index and Computes QoS indexes weights. Finally, based...
The rapid growth in micro-electronics technology and research in wireless sensor networks (WSNs) has made it possible to realize multimedia delivery on wireless multimedia sensor networks (WMSNs), consisting of tiny sensing devices. The volume and characteristics of multimedia data produced by WMSNs is quite different from the scalar data generated by conventional WSNs. This has raised the need to...
Future WSNs are expected to carry different traffic such as voice and video as well as data to serve both real and non-real time applications. Therefore, the reliability and quality of the data delivered to support diverse applications is very important. Also, service differentiation is an essential component of QoS that should be supported by routing protocols. In this paper, we introduce a novel...
In fire fighting having prompt and reliable tracking and communication in case of emergency is of paramount importance. We developed an integrated positioning, sensing and communication platform for tracking first responders in urban fire fighting. A Quality of Service (QoS) enabled TDMA MAC (QT-MAC) was designed to provide a low latency and high reliability service for critical data transfer, as...
The vehicular wireless ad hoc network (VANET), a specialized wireless sensor network, is booming to provide safety and comfort for passengers. Special features of VANET, such as high mobility nodes and large scale node population, make the Quality of Service (QoS) task extremely challenging. To provide Quality of Service (QoS) to traffic safety and entertainment applications in VANET, we propose a...
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