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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...
This paper addresses the problem of efficient data dissemination in Vehicular Ad Hoc Networks (VANETs), which particularly suffer from changing densities in the network topology due to congested and sparse traffic on the roads. We present a new network layer protocol in the family of geographic network protocols, which makes use of distance and time information following a dissemination strategy to...
The paper presents a proposal of a new multicast routing algorithm for finding a multicast tree in packet-switched networks. The objective of the MLRA (Multicast Routing Algorithm with Lagrange Relaxation) is to minimize the cost of paths between the source and each destination node using Lagrange relaxation, and eventually, minimize the total cost of multicast tree. A wide range of simulation experiments...
Dynamic routing is very important in terms of assuring QoS in today's packet networks especially for streaming and elastic services. Existing solutions dedicated to dynamic routing are often too complicated and seem to be not usable in real time traffic scenarios where transferred traffic may vary significantly. This was the main reason for research and new routing mechanism proposal which should...
The average burst delay and the standard deviation (SD) of burst delay in the context of the Butterfly networks are investigated and compared, when three types of automatic repeat request (ARQ) schemes, namely, the stop-and-wait ARQ (SW-ARQ), go-back-N ARQ (GBN-ARQ) and the selective-repeat ARQ (SR-ARQ), are considered. We assume that packets in a burst arrive at a constant rate and that the packet...
OCDM networks have a cycle attack caused by MAI propagation and disrupted network services. We describe a path establishment method constructed autonomously by logical tree topology to prevent this problem.
In this paper we present a full performance analysis of an energy conserving routing protocol in mobile ad hoc network, named EM-AODV (Energy Multi-path Ad-hoc On-demand Distance Vector routing). EM-AODV is a reactive routing protocol which combines two mechanisms used in the basic AODV protocol. AODV and most of the on demand ad hoc routing protocols use single route reply along reverse path. Rapid...
Recently, scaling problems faced by today's Internet are attracting more and more attentions. It is commonly recognized that separating IP address into identifier and locator is an effective way to solve the problem. How to map identity onto locator is a critical challenge for the locator/ID separation network. We present a resolution of mapping service based on one-hop DHT to resolve a locator for...
In recent years, MANETs are continuing to attract the attention for their potential use in several fields such as military activities, rescue operations and time-critical applications. In this paper, we present the implementation and analysis of our implemented MANET testbed considering AODV and OLSR protocols for wireless multi-hop networking. We investigate the effect of mobility and topology changing...
In the signaling plane of an IMS (IP Multimedia Subsystem) network, the interrogating Call/Session Control Function (I-CSCF) is required to choose the serving CSCF (S-CSCF) for user requests arriving at the proxy CSCFs (P-CSCF). This requires S-CSCF selection in such a way that the response time is minimized. However, in an overloaded situation, the P-CSCF entry points for arriving requests must balance...
Wireless mesh networks (WMNs) have gained tremendous popularity as a cost effective and reliable solution to last-mile broadband Internet connectivity. However, the network design without global information is a challenging task. We study the optimal network topology design problem in WMNs and propose an ant-based cognitive networking algorithm to search a topology with the minimum cost while guaranteeing...
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...
In this paper, the author firstly analyzes the limitations of the existing short-range networks, and then proposes a new wireless network protocol and puts forward my own view on system architecture, network topology, wireless channel competition algorithm and multi-path selection algorithm, finally presents hardware and software design block diagram of wireless node. The application performances...
Mobile Ad hoc network is a self-organizing, multi-hop and wireless network. This kind of networking is convenient to construct because it is free of time and space and it can be constructed without infrastructure. It has been widely used on many occasions such as danger zones, military regions, hospital and family. Due to the dynamic changes of topology, Ad hoc network has its particularity of routing...
With the advantages of asynchronous and loosely coupled communication model, the Publish/Subscribe system has been widely spread in large-scale distributed mobile networks. According to the MANET's characteristics of dynamic topology and bandwidth-constraint, we propose an application scheme of Publish/Subscribe system over clustering MANET. We improve the cluster header by adding the Information...
This paper proposes a new ring structure of network coding (RSNC) based on existing network coding topology, enlarging the field of application and reducing the complexity of coding. On the basis of real-time monitoring and dynamic allocation for network bandwidth, RSNC is applied to the CERNET backbone network. The route of the packet is decided by the source node when it sends data packet and it...
In order to improve the scheduling efficiency of IEEE 802.16 mesh mode, exactly theoretical analysis is necessary. In the IEEE 802.16 mesh mode with distributed coordinated scheduling, all nodes are peers and multi-hop communication is allowed. Every node has to compete for transmission opportunities based on scheduling information in the two-hop neighborhood. In this paper, we use probability-based...
In order to achieve high performance, graph coloring algorithms are used to schedule the time slots in IEEE802.15.4 compliant wireless sensor network. These algorithms tint the links with different color and use the number of color to determine the length of superframe, and then assign the color to corresponding time slots of superframe. In this paper, the impacts of the assignment on network throughput...
The requirement of QoE is gradually increasing currently. Simultaneously, as the intermedium between the users and network, devices support collecting several QoS parameters which could predict expected QoE for users. However, a large quantity of mobile devices will become the obstacle for the QoS collection due to the costs of collection traffic. To solve it, this paper proposes a framework for collecting...
As a new networking topology, Wireless Mesh Networks (WMNs) have advantageous properties in terms of robustness, range extension and density, but also have significant potential disadvantages, which determines some classical load-balancing algorithms are not very suitable for WMNs. In this paper, we propose a novel load-balancing algorithm to improve the networks performance. The new scheme, which...
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