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Promising machine-to-machine (M2M) communication emerges to achieve ubiquitous communications among objects and the surrounding environment in everyday life. For a large M2M network to support scrupulous connections among abundant devices, sharing radio resource efficiently with the existing wireless networks while maintaining sufficient quality-of-service (QoS) for reliable communications becomes...
With the advancement of Internet technologies and the widespread use of mobile devices, the number of users in conferencing services is increasing quickly. A P2PSIP conferencing system and an IP Multimedia Subsystem (IMS) conferencing system have been designed to provide conferencing services. The IMS conferencing system was developed to adapt to a server-based centralized system, while the P2P network,...
To successfully deliver the IPTV content to end-users, robust and resource-efficient error recovery techniques are required that can overcome the problems encountered during the end-to-end delivery process. To achieve this objective by also enabling quick error recovery, one preferred approach is to install a dedicated server, referred to as the error recovery server, between the head-end office and...
This paper focuses on reducing the Network Address Translator (NAT) traversal-related components of the session establishment delay in peer-to-peer Session Initiation Protocol (P2PSIP) overlays. To reduce the delay, we propose to group the management of different connections so that the (time-consuming) NAT traversal procedures performed for one connection can be reused when establishing other connections...
Due to complicated implementation of IP multicast, application layer multicast has attracted the attention of researchers. Tree overlay has some challenges such as resiliency problems caused by peer churns and also network resources may not be efficiently used. Mesh overlay doesn't have such problems, but has a high delivery latency and overhead caused by pull mechanism. Using a hybrid mesh/tree overlay...
Recently it has been shown that network coding can highly improve the network throughput in the communication systems and specifically increase the downloading performance in P2P networks. This paper presents a new live streaming system for GIA-based P2P networks. In the proposed system the traditional GIA protocol is improved for an efficient use in multimedia applications. We introduce a new mesh-pull...
Radio Frequency Identification (RFID) technology is becoming very popular for a wide range of applications such as identification, tracking of persons, animals or items, localization, collaborative platforms and is considered as the main building block for the realization of the Internet of Things paradigm. However RFID hardware is not widely available in current personal mobile terminals limiting...
Peer-to-Peer Session Initiation Protocol (P2PSIP) is a distributed communication system being standardized in the Internet Engineering Task Force (IETF). Since it uses the peer-to-peer paradigm, P2PSIP faces the problems created by Network Address Translators (NATs); even peers located behind NATs need to be able to not only initiate connections to other peers but also accept connections initiated...
BitTorrent developers have recently introduced a new application layer congestion control algorithm based on UDP framing at transport layer and currently under definition at the IETF ledbat Working Group. Ledbat is a delay-based protocol which aims at offering a ``lower than Best Effort'''' data transfer service, with a lower priority with respect to elastic TCP and interactive traffic (e.g., VoIP,...
Peer-to-Peer overlay networks are an attractive foundation for video streaming. However, live Peer-to-Peer media streaming systems face many challenges such as bandwidth heterogeneity, node churn, and selfish nodes. Although many tree based and mesh based streaming protocols have been proposed, each has its own drawbacks such as unreliability and unfairness in tree based and long startup delay and...
When a content provider (CP) provides peer-to-peer live streaming service, routing decisions based on the knowledge of underlay traffic could lead to much better performance (such as user delay). On the other hand, if the Internet Service Providers (ISPs) provide underlay traffic information to the CP, their overall network cost due to routing inefficiencies could be reduced. There is hence incentive...
This paper presents a mesh-pull peer-to-peer (P2P) live video streaming system. The proposed XOR-based Network Coding (XOR-NC) system is based on GIA protocol and introduces new search and answer data formats for chunks which are used by the network coding algorithm for exchanging data among peers. The search message contains the XORed GOP (Group of Picture) keys and some meta-data such as search...
The efficiency of Bit Torrent in disseminating content has inspired a number of P2P protocols for on-demand video streaming (VoD). Prior work on adapting Bit Torrent to VoD mainly focused on the piece selection policy, since streaming requires a somewhat "in order" download progress. Conversely, not much effort has been spent into adapting Bit Torrent's peer selection policy, where nodes...
As a superior approach for peer-to-peer (P2P) streaming live media, mesh-based overlay has made much success due to its potential scalability and ease of deployment. Peers in mesh streaming systems employ a swarming content delivery mechanism to exchange resources. However, the limited availability of new content heavily affects the quality of delivered stream. Aiming at leveraging and optimizing...
In peer-to-peer (P2P) applications, a scalable group of multiple peer processes (peers) are required to cooperate with each other. In this paper, we discuss a two-layered heterogeneous hybrid time (THHT) protocol which takes advantage of the linear time (LT) and physical time (PT) to causally order messages in a scalable heterogeneous group. In a heterogeneous type of group, the clock accuracy of...
This research develops an Autonomous Distributed and Cooperative disaster information system based on the Internet technologies which distribute sensor information such as meteorological information. It is essential that disaster prevention systems collect and classify information or deliver to local residents rapidly. However, there are some problems with information sharing among some agencies because...
In TCP-based overlay applications, the TCP connections of one peer typically share one physical Internet link. Using real-world experiments, we demonstrate that this can lead to undesirable interactions, causing significant throughput loss. We argue that such effects should be taken into account in the design of overlay networks, and identify readily deployable countermeasures. In a first step, we...
Due to mobility, communication links between mobile nodes are transient and network maintenance overhead is a major performance bottleneck for data transmission. Low node density makes it difficult to establish end-to-end connection, thus impeding a continuous end-to-end path between a source and a destination. This creates a modern type of DTN, which was originally intended for communication in outer...
Peer-to-Peer (P2P) media streaming networks have attracted significant research interest recently. However, it is challenging to design live P2P media streaming systems because of the stringent time constraints on the delivered media streams, which require more efficient and resilient overlay. In this paper, we focus on live P2P media streaming networks, a promising application flourishing in the...
Gossip-based protocols are a popular approach to estimate aggregates in P2P systems. For gossip-based aggregation protocols, the accuracy of the estimated aggregate heavily depends upon conservation of the system mass. In this paper, we present a gossip-based asynchronous aggregation protocol. Our protocol conserves the system mass under asynchronous settings and churn. Simulation results show that...
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