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We investigate the tradeoff between two mutually conflicting performance objectives—throughput and delay—for fast, periodic data collection in tree-based sensor networks arbitrarily deployed in 2-D. Two primary factors that affect the data collection rate (throughput) and timeliness (delay) are: 1) efficiency of the link scheduling protocol, and 2) structure of the routing tree in terms of its node...
A voice conversation is predominantly known as a synchronous, delay intolerant form of communication. To complement voice conversations, voice messaging is a form of asynchronous communication used when the called party is unavailable; a delay in message delivery is naturally expected and tolerated. To this extent, a Delay Tolerant Network can be utilized as the underlying data transport mechanism...
A lab trial validating the implemented GMPLS control plane for MPLS-TP in the ADRENALINE testbed is presented. We experimentally compare the establishment of bidirectional LSPs using either source or PCE-based path computations.
Delivering desired QoS to the applications is one of the most important challenges in next generation networks. Designing efficient queue management in midway nodes leads to improvement in NGN efficiency. This paper presents fair Efficient active Queue Management (EQM) mechanism for congestion avoidance and control in next generation networks. Proposed AQM mechanism uses instantaneous queue length...
There has been much research focusing on the routing problem in delay tolerant networks (DTNs). Much of the work has mainly focused on coding schemes for message distribution, while other work has been done on the probabilistic forwarding. Coding schemes achieve higher delivery rate via redundancy before forwarding, while probabilistic forwarding efficiently limits the abuse of the store and forward...
Most multicast routing protocols construct reverse shortest path trees (SPTs) to deliver shared data. However, the use of the reverse SPT presents a challenge in the inter-domain routing environment, as the path from the source to a receiver could be asymmetric to the one used to go from the receiver to the source. A possible approach is to utilize the round-trip joining message but it incurs the...
Delay Tolerant Mobile Sensor Network (DTMSN) is the network for pervasive information gathering. Traditional data information gathering approaches may not fit for DTMSN for its intermittent connectivity. This paper proposes an Activity Based Data gathering protocol (ABD). In DTMSN, activity of different sensors may vary since they are attached to different entities, the message replicated by the active...
Event source anonymity is potentially an important aspect of secure wireless sensor networks (WSN). The existing schemes developed for wired networks do not work in WSNs due to the characteristics of radio transmission and limited resources. A recent article proposed several solutions for the strong global adversary model. The protocols depend on dummy messages and special proxy nodes that filter...
Recently, wireless sensor network is widely used. The deployment of WSN in the field, however, is still restricted due to limited energy supply, limited computing power, limited buffer size, and packet delay. In this paper we present a new cluster model and polling protocol integrating the schedule polling and low power listening scheme. The new clustering approach allows short routing between the...
Using multiple paths to transmit data simultaneously in wireless sensor networks is regarded to reduce end-to-end delay and achieve higher throughput. However, the interference between these multiple paths causes a significant reduction in the overall performance. Previous methods tried to solve this problem either with the aid of special hardware or under unrealistic assumption, such as the interference...
Compared to traditional wireless network routing protocols, geographic routing provides superior scalability and thus is widely used in vehicular ad hoc networks (VANETs). However, it requires every vehicle to broadcast its location information to its neighboring nodes, and this process will compromise user's location privacy. Existing solutions to this problem can be categorized into two groups:...
We propose a distributed routing scheme for cog- nitive radio ad hoc networks which, besides the awareness of the dynamic behavior of the primary users, also considers that some primary users may be hidden to secondary nodes, thus creating asymmetry in the spectrum opportunity availability. We identify this "Hidden Primary User" problem and we introduce in our distributed protocol a mechanism...
Due to the broadcast nature of wireless channels, neighbouring sensor nodes may overhear packets transmissions from each other even if they are not the intended recipients of these transmissions. This redundant packet reception leads to unnecessary expenditure of battery energy of the recipients. Particularly in highly dense sensor networks, overhearing or eavesdropping overheads can constitute a...
Disruption Tolerant Networks (DTNs) are characterized by frequent network partitioning. This causes network connectivity to be opportunistic. In recent years, many collaborative applications have been envisioned for DTNs. These applications rely on the availability of reliable group communication protocols. To address this challenge in DTNs, we propose a scalable multicasting scheme that deterministically...
Multipath Transport Protocols like Stream Control Transmission Protocol (SCTP) and Multipath TCP (MPTCP) support concurrent usage of multiple paths between the end users. In this paper we investigate the flow division at the source among multiple paths as an optimization problem. We also introduce link-by-link error recovery scheme and compare the system performance when the traditional end-to-end...
In this paper, we discuss the issues of QoS multicast routing in multi-hop Cognitive Radio (CR) networks. The problem of our concern is: given a CR network and a QoS multicast request, how to set up a multicast connection so that the total bandwidth consumption of the multicast is minimized while the QoS requirements are met. We propose a distributed protocol which uses shortest path tree as the multicast...
Scalable routing in wireless sensor network (WSN) is required for future applications to provide high-quality and robust transmission. In this paper we propose a Polychromatic Sets based scalable Routing (PSR) scheme for WSNs. PSR is a hierarchical routing scheme designed to scale to the network size. This scheme firstly partitions the network into multiple clusters which are organized as a multilevel...
In this paper, we describe how a context-driven disruption tolerant network may be utilized for vehicular applications. The key concept involves utilizing contextual information pertaining to space and time settings of applications to drive networking functions. As a result, the performance characteristics may be better attuned to the time-scale of relevant vehicular applications. We discuss the protocol...
A Vehicular Ad Hoc Network (VANET) not only experiences highly mobile and frequently disconnected, but may also have to deal with rapid changes of network topologies, especially when accidents and road traffic jams happen. In this paper, we propose a novel approach to address this issue. Due to the intermittent connectivity in VANET, we adopt the idea of carry and forward, where a moving vehicle carries...
The Industrial Ethernet is promising for the implementation of a Cloud Computing based control system. However, numerous standard organizations and vendors have developed various Industrial Ethernets to satisfy the real-time requirements of field devices. This paper presents a real-time reconfigurable protocol stack to cope with this challenge, by introducing the architecture with a core of dynamic...
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