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Ad-hoc networks generally play a vital role in emerging technologies. The limited communication and computation resources, the unguaranteed connectivity to trusted authorities make known security solutions for wired networks. A novel Tiered Authentication scheme for Multicast traffic (TAM) has large scale of ad-hoc networks. Nodes are grouped into the cluster. Cross-cluster multicast traffic includes...
In wide-area video conferencing, the rate control of video sources to relieve network congestion along the multicast data path occurs in a distributed manner. In this paper, we study the desirable properties of signaling channels that carry the `packet loss report' (ELR) from a receiver to the sources as a short control message. A signaling channel provides for loss-free and time-ordered flow of ELRs...
Previous works on network coding have mainly focused on the throughput and the cost of bandwidth, but few cares about saving resources used to code. In this paper we present a decentralized algorithm to construct network coding solutions, which reduces the number of coding nodes. We showed the dynamic topology greatly affected the network coding solutions, which may improve coding solution or reduce...
Long Term Evolution (LTE) constitutes the latest step before the 4th generation (4G) of radio technologies designed to increase the capacity and speed of mobile communications. To support Multimedia Broadcast/Multicast Services (MBMS), LTE offers the possibility to transmit Multimedia Broadcast multicast service over a Single Frequency Network (MBSFN), where a time-synchronized common waveform is...
The congestion control scheme plays a critical role in the multicast communication. Without a proper congestion control mechanism, multicast protocols would cause unfairness while sharing network bandwidth with other flows. We propose a deliberated congestion control scheme to multicast multimedia contents for smart phones retrieving effectively. Our key idea is to detect the single trip time of packet...
As the infrastructure-centric model of peer-to-peer streaming, recent overlay construction schemes compose a hierarchical topology of peers by grouping them into clusters. There is a server in each cluster that receives data from the source and relays it to its cluster members. In this paper, we propose an alternative infrastructure-centric peer-to-peer framework called BAHMO that constructs a hierarchical...
Previously, we studied the performance of transport layer multihoming (e.g., STCP). Using the emulated application of the bulk data transfer, we investigate existing overlay multicast schemes and find that all of them have a inherit performance limitation caused by tansport layer singlehoming (e.g., TCP). Based on this, we design a new overlay multicast architucture named the Hierarchy Overlay Multicast...
Controller Area Network (CAN) provides an inexpensive and robust network technology in many application domains. However, the use of CAN is constrained by limitations with respect to fault isolation, bandwidth, wire length, namespaces and diagnosis. This paper presents a solution to overcome these limitations by replacing the CAN bus with a star topology. We introduce a CAN router that detects and...
Mulitcast communication is an effective and promising way for dissemination of the same data to potentially large number of receivers. In multicast congestion control proposed thus far, the receiver with the worst congestion level is selected as the representative and transmission rate of multicast sender is regulated so that it is adjusted to TCP throughput of the representative. However, in wireless...
In this paper we present a testbed for the functional and performance verification and validation of product level overlay multicast (or ALM in short) applications which is a complex task due to humongous test patterns. Structured, systematic and simplified test environment is vital for product level quality validation. The key features of this testbed are network emulation, automated test scenario...
It is important to use an ALM (application layer multicast) tree with broad bandwidth to ensure the quality of streaming applications. However, when constructing an ALM tree without information on underlay traffic, we cannot know how much congestion there is in links. Therefore, if unexpected congestion in links occurs, the quality of ALM transmissions may worsen. However, no polynomial-time algorithms...
We consider a wide-area video conferencing application where the video sources can adapt their send rates according to the available bandwidth in the network paths. We advocate a joint rate control of the sources to relieve the congestion, instead of running multiple instances of a single-source adaptation algorithm and additively superposing their results. The existing techniques work nicely with...
Software Defined Radio (SDR) allows dynamically changing protocols and functions in order to provide flexible, multiple-standard services to users. A reconfigurable baseband architecture having a set of coarse-grained, heterogeneous execution units is one strategy which can meet this requirement. However, while we can integrate a large number of execution units onto a chip, conventional bus structures...
In this paper, we address the problem of supporting receivers that require different sessions of a multicast application based on their desired rates. We present a distributed bandwidth partitioning scheme to share the bandwidths on the links in such a way that data rate requirements of each receiver in the multicast is met. The salient features of our scheme are: (i) each receiver can simultaneously...
In this work, we propose using video caching in the wireless relay networks (WRNs) for video on demand (VoD) service. We assume the relay station (RS) of the WRNs is capable of caching a small portion of the ongoing video stream. The cached video data can be used to accommodate new user requests. Previous works on video caching for VoD are in the context of overlay network, where the physical topology...
IP multicast has been proposed for over a decade, but deployment in heterogeneous Internet is still limited within small area for lack of network management and congestion control. Many application layer multicast (ALM) protocols have been proved to be more scalable and feasible than IP multicast in practical environment. In this paper, we propose an ALM protocol called scalable hierarchical multicast...
This paper proposes a distributed application layer multicast model based on central ring carousel algorithm. The model employs ring as the basic topology units, and constructs carousel on each central node. GT-ITM topology generator is used to generate the topology. The simulation results prove that CRCL has high transmission efficiency, less convergence time while it also has ideal average path...
We have developed the multicast middleware, a bridge between IP multicast and a self-organizing overlay multicast infrastructure, in order to make IP multicast available to the end user.We compare the performance of native IP multicast and IP multicast tunneled through a P2P overlay multicast network using the multicast middleware. We show that the achievable throughput can be quite high when using...
Determining the size of a network and its diameter are important functions in distributed systems, as there are a number of algorithms which rely on such parameters, or at least on estimates of those values. The Extrema Propagation technique allows the estimation of the size of a network in a fast, distributed and fault tolerant manner. The technique was previously studied in a simulation setting...
With the rapid growth of the wireless network and the function of mobile terminal, the services which need the wide bandwidth like video streaming are expected to be used extensively over wireless networks. Overlay multicast in which a terminal relays the content to other terminals is able to deliver it to enormous terminals. However, due to instantaneous disconnection and rapid bandwidth decrease...
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