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Reliable data transport has always been one of central issues in the area of communication networks. In this work, we investigate the possibility of enhancing reliability of selective repeat (SR) automatic repeat request (ARQ) by integrating network coding techniques into it. Through extensive simulation experiments, we analyze packet transport performance, e.g., throughput and delay, against various...
The main focus of this work is to experimentally determine the performance, message persistence and scalability options of ActiveMQ — a message broker that provides an implementation of JMS specification with OpenMQ (another JMS broker). A comparative analysis is done between both ActiveMQ and OpenMQ JMS message brokers using the same tools and configuration parameters. The outcome of this work is...
A broadcast transmission scheme for multimedia broadcast multicast services (MBMS) is proposed using a coded system with users' feedback in wireless systems. In the proposed transmission scheme, it is possible to adjust the transmission rate with binary users' feedback signals to maximize the overall throughput for a given set of users as a user-ware broadcast transmission scheme. The proposed scheme...
Recent, as interest in the vehicle communication is high, various techniques have been developed. However, the vehicle communication has a problem due to high-speed mobility of vehicle. Especially V2I (Vehicle-to-Infrastructure) communication has a biggest problem that is deterioration of continuity and reliability caused by frequent hand-off with base station due to high-speed mobility of vehicle...
In the modern computing industry, cloud computing has drawn huge attention from researchers in government and enterprises. Until now, reliability in cloud computing has received limited consideration hence Fault tolerance in cloud computing is the foremost challenging issue. In cloud computing environment, the clients subcontract their data to the cloud that performs the desired computing operations...
With the prevalence of mobile computing and its convergence with cloud computing, there is an increasing trend of composing existing cloud services for rapid development of cloud-based mobile applications. It is vital for developers to find services not only satisfying their functionality requirements, but also meeting the requirements on non-functional quality of services (QoS). These QoS requirements,...
A new approach is introduced to obtain the reliability function of time-dependent system by using reliable node and reliable path concept in mobile ad-hoc network (MANET). It is known that all nodes of the MANET are not functional at all the time. Upon the failure of any node in the active path of the network, the system switches to the next path and correspondingly the connection between the source...
Cloud Computing is a major area of research. Cost and Load balancing has become an important QoS parameter. Load Balancing directly affects the Reliability, Response Time, Throughput and Energy Efficiency of a Server. A good Load Balanced architecture implies minimized overall time, less server failure, minimized response time, increased throughput and less wastage of energy. Such architecture also...
Given an unreliable communication link, this paper studies how to build, in an energy-efficient manner, a reliable communication service that is synchronous with high probability. We consider a Partially Observable Markov Decision Process (POMDP) setting in which a communication link's transmission quality: (i) changes according to a classic Markovian model and (ii) can be only partially observed,...
Many applications today rely on multiple services, whose results are combined to form the application's response. In such contexts, the most unreliable service and the slowest service determine the application's reliability and response time, respectively. State-machine replication and atomic broadcast are fundamental abstractions to build highly available services. In this paper, we consider the...
MANET (Mobile Ad Hoc Network) consists of mobile nodes having no fixed infrastructure. These networks have dynamic topology and all the nodes are in general autonomous. Normally network comprises of selfish individuals that are not willing to forward the packets but wants to forward their own messages. In ad hoc network throughput increases when all available nodes are used for routing and forwarding...
This paper proposes a Partial Hybrid Automatic Repeat reQuest (P-HARQ) scheme where the relaying nodes select either forwarding the erroneous packets or requesting retransmission. In contrast to the conventional technique where the erroneous packets is always discarded, the packets found to have errors after decoding are interleaved, re-encoded, and forwarded if relay selects the forwarding mode....
The IEEE 1609.4 protocol adopts the alternating channel access mechanism, in which the synchronization interval is separated into control channel interval and service channel interval. The vehicles can only exchange the control information in control channel interval and the service information in service channel interval separately, but the wireless resource could not be used efficiently. In this...
Great efforts are made to store data in a secure, reliable, and authentic way in large storage systems. Specialized, system specific clients help to achieve these goals. Nevertheless, often standard tools for hashing, compressing, and encrypting data are arranged in transparent pipelines. We analyze the potential of Unix shell pipelines with several high-speed and high-compression algorithms that...
The era of cloud based multimedia applications has lead to a huge increase in the no. of requests on cloud. The increased no. of requests on cloud leads to an increased workload, making workload balancing an important QoS Parameter. Workload Balancing also leads to a judicious use of resources like electricity etc. and thus promotes the concept of Green IT. The paper presents a new Load Balanced Resource...
Cooperative multi-cell MIMO techniques are well known for their outstanding capability to mitigate inter-cell interference by allowing user data to be jointly processed by several interfering base stations for the improvement of the system performance. This paper proposes an iterative algorithm that designs the precoding matrix for cooperative multi-cell MIMO downlink communications. As the demand...
The recently proposed Glossy protocol demonstrated the high potential of constructive interference (CI) in improving communication performance in wireless sensor networks. This paper presents a network flooding protocol, Ripple, which also exploits CI while improving Glossy in terms of throughput and energy efficiency by a factor of three each. To this end, we propose to pipeline transmissions on...
We present a new method for finding attacks in unmodified transport protocol implementations using the specification of the protocol state machine to reduce the search space of possible attacks. Such reduction is obtained by appling malicious actions to all packets of the same type observed in the same state instead of applying them to individual packets. Our method requires knowledge of the packet...
Blockage of communication links due to environmental obstructions and the resulting on/off channel behavior present challenges for providing reliable communication in mobile wireless networks. Traditional reliability techniques such as forward error correction and automatic repeat request (ARQ) are not designed to operate at the timescales typically observed in blockage channels. This work presents...
A network with densely deployed access points can perform better and more reliably by adapting the transmission parameters like transmission power, minimum size of contention window (cwmin), maximum size of contention window (cwmax) and transmission rate. To understand the impact of these parameters on performance of CSMA-based protocol in a multi-AP network, we are building a testbed called DAPnet...
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