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Industrial automation requires hard real-time delivery of data that can be of periodic or sporadic in nature. It is challenging to ensure hard real-time delivery of periodic and sporadic data to a multi-hop away destination in a bandwidth constrained environment, such as wireless sensor networks. In this regard, research has been done for joint scheduling of periodic and sporadic data delivery using...
We describe here a new burst scheduling algorithm to avoid burst overlapping in the egress router of optical burst switching (OBS) network, and hence to improve the quality of service (QoS) in developing several optical networks to fulfill the increasing demand of Internet facilities. We consider TAG (tell-and-go) protocol where many lightpaths pass in a given link and burst overlap may occur. In...
In this paper Dynamic Sleep Scheduling (DSS) for Minimizing Delay in Wireless Sensor Network is proposed. To reduce delay, DSS identifies nodes for different sleep/wake according to their traffic load at two levels: a) Nodes with different sleep/wake schedule requirement according to their different traffic load based on their topological importance in the network. b) Nodes with different sleep/wake...
A Framework for Integrated Routing, Scheduling and Traffic Management (FIRST) in Ad Hoc Networks is introduced. Unicast and multicast routes are established in coordination with the scheduling of transmissions and bandwidth reservations in a way that bandwidth and delay guarantees can be enforced on a per-hop and end-to-end basis. Results from detailed simulation experiments show that, compared to...
Several underwater network characteristics, including long propagation delays and a bandwidth dependent on distance, provide unique challenges to protocol designers. In this paper we present STUMP-WR, a distributed routing and channel scheduling protocol, designed for heavily loaded underwater networks. STUMP-WR selects and schedules links using a distributed algorithm to overlap communications by...
CBTC (Communication Based Train Control) will be based on mobile communication, which the key problem is how to support reliability of control data transmission to improve track utilization and enhance train safety. This paper proposed a kind of real-time transmission model for high speed train end-to-end control data operation, which based on circuit switched data service by traditional wireless...
The bandwidth in wireless networks is usually shared by a number of wireless nodes. The channel capacity depends on the number of accessing nodes, time, environmental conditions and location of nodes. Due to varying channel conditions, several issues are observed in the transmission of real time multimedia. The existing research on multimedia streaming can be classified into adaptation techniques...
Providing guaranteed quality-of-service (QoS) for resource-hungry multimedia applications over wireless fading channels is challenging. Traditional layered architecture fails miserably in providing the QoS requirement of high throughput, low latency demand of these kinds of applications in wireless mobile networks. Cross-layer design approaches are critical for efficient utilization of the scarce...
Recent Internet traffic measurement shows that the majority of the TCP flows are short lived. Use of short flow highest priority scheduling provides the performance improvement in the internet traffic. However, long lived flows competing against the short flows starve at some point. We propose a novel two class Queue State Packet Scheduling mechanism, namely QSPS which treats long flows fairly without...
In wireless networks, transmissions can generally be overheard by unintended nodes in the vicinity of the sender and receiver, potentially causing interference to their own communications. Much of the related research has considered this as a nuisance and resulted in various proposals for overcoming the interference using scheduling, channel assignment, and many other mechanisms. In recent years,...
In this paper, we develop and evaluate models to estimate and optimize various performance metrics for unicast traffic using the hard scheduling (virtual circuit connection-oriented) mode of the reservation based protocol USAP in mobile ad-hoc wireless networks (MANETs). USAP (Unifying Slot Assignment Protocol) is a dynamic distributed resource allocation protocol for MANETs. We model USAP hard scheduling...
A novel MAC protocol is named beforehand bandwidth reservation (BBR) based on reserve the empty slots in the next big-slot cycle is proposed for OBS ring networks by control channel. To evaluate optimal utilization of channel bandwidth under unbalance traffic scenario, this paper studies packet scheduling based on statistic TDM scheme to allocate the idle slots. For achieving best performance, the...
This paper aims to investigate the minislot scheduling problem in IEEE 802.16 mesh networks, where a minislot is the atomic unit for bandwidth allocation. Inappropriate minislot selection will cause minislot insufficient problems and the data collision problems. These problems will degrade the network throughput and the minislot utilization. Therefore, a Decentralized Minislot Scheduling Protocol...
The receiver capacity model is a simple model to capture flow dynamics in a multi-hop wireless network, by presenting linear constraints to define the feasible rate region of the network, taking into account interference. The model associates with each receiver in the network a notion of constant receiver capacity. Receiver capacity is defined as the maximum possible sum rate of all flows that the...
The cross-layer concept originated almost ten years ago with the aim of taking the most advantage from the difficult wireless media to break the barriers imposed by the layered transmission. One of the domains where cross-layer design has been more investigated is radio resource allocation, since current and future networks need to provide wireless connectivity to heterogeneous users, offering many...
With the rapid development of advanced data transmission technologies in avionics fields, AFDX (Avionics Full Duplex Switched Ethernet) shows great potential in on-board avionics system because of its high bandwidth and real-time property. In this paper, we present a feasible software framework to implement AFDX protocol on VxWorks Operating System. Additional improvements are made to enhance the...
Recently Andrew et al. proposed the TCP evaluation suite to provide a common test suite for researchers designing new TCP extensions and AQM mechanisms. It defines network topologies, simulation scenarios i.e. traffic characteristic as well as evaluation parameters to provide a common testbed for all new enhancements. The presented remarks determine the essential features of a simulation environment...
Quality of Service (QoS) support has become a key factor in designing Media Access Control (MAC) protocols. This paper introduces a novel scheduling scheme which supports priority based QoS in Wavelength Division Multiplexing (WDM) star networks. The proposed Interval-based Prioritized Orderly Scheduling Strategy (IPOSS) employs a collision-free scheduling approach and handles variable-length data...
In this paper, we propose an integrated cross-layer data reporting scheme focusing on communication protocols in wireless sensor networks. The scheme operates based on the various application demands and available resources to provide an adaptive quality of service (QoS). The goal of this work is to achieve the expected information quality at the end system by efficiently controlling data reporting...
Wireless mesh networks (WMNs) are emerging as a promising technology for backhauling data traffic from wireless access networks to the wired Internet. Such networks are expected to support various types of applications with different quality of service (QoS) requirements. In this paper, we provide a complete cross-layer solution for WMNs together with its OPNET simulation architecture that comprises...
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