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Network coding is a promising technique to improve the throughput performance of wireless networks. In this paper, we propose a novel network-coding-based hybrid retransmission request protocol for two-way relaying system. The proposed protocol can retransmit more information in a given time interval by introducing network coding in the retransmission process, thus improving the throughput. Furthermore,...
A new scheduling module, the Selective Early Detection (SED) mechanism is proposed in this paper. An experimental evaluation in order to demonstrate how this algorithm succeeds in enhancing the quality, improving the performance and easing the deployment of a production level service is carried out. SED algorithm is useful in controlling the Actual average queue size, and hence the queuing delay,...
Increasing demand for ubiquitous high speed data access has resulted in widespread deployment of heterogeneous wireless networking domains. Integration of heterogeneous networks presents some considerable challenges which include the demand for seamless handoff, continuity of data traffic & multimedia sessions and central authentication system, billing & security. In this paper the...
For ad-hoc wireless sensor networks (WSN), multi-hop routing has been adopted in order to save communication power consumption and to increase network lifetimes. In contrast to traditional multi-hop routing, the Opportunistic Routing (OR) protocol provides an alternative and efficient method for exploiting the spatial and temporal characteristics of wireless networks. One of the more important aspects...
In this paper we discuss the architecture of MStack, a data-centric communications stack specifically designed for mobile intermittent networking environments. MStack contains native support for delay tolerant connections, it is resilient to disconnections, and solves other problems associated with mobile devices. The architecture and its main protocols are discussed, together with some examples of...
By analyzing the signal lings exchange of SIP deeply, GSPN model of protocol is established for evaluating the performance of protocol, reducing call setup time of SIP and obtaining a tradeoff between the performance and the number of buffer. Basing on the model, markov chain of model is designed. Based on properties of constructed markov chain, performance of SIP is studied and evaluated through...
Due to the characteristic of highly dynamic topology, high bit error rate and large propagation delay of inter-satellite links, the reasons causing packet loss are various in the space information networks. As traditional routing maintenance strategy of source node rerouting causes high time delay and high network overhead, the new strategy based on packet loss distinction is proposed. Routing maintenance...
VoIP is replacing traditional telephony system over PSTN as a more affordable communication tool on account of convergence of networks. Meanwhile, security issue brings more attention and becomes more important. SIP is based on text message. This makes the protocol easy to implement but also creates opportunity for hackers to steal or modify the messages. There exist a various approaches to secure...
In Underwater sensor networks (UWSN), Nodes are powered by battery. So saving energy is an important factor to estimate routing protocol. In this paper, we briefly introduced the vector-Based Forwarding and proposed an energy balance method to improve the lifetime of originate VBF. We sensor the energy information of neighbor nodes and decide whether participate in transport packets according the...
STP Spanning Tree Protocol as an important method to prevent broadcast storms since the 1985 proposed by Radia Perlem, has been widely used. This paper presents anew technology named DVSP-open flow. Compare STP and the STP improved version, this technology can be can be forward data packets dynamic by using Open Flow support switches. This method separates the forward rules and control rules and the...
Vehicular Ad-hoc Networks (VANET) offer promising solutions towards infrastructureless collaborative active safety of the road vehicles. Active safety related data dissemination in vehicle-to-vehicle (V2V) communication requires reliable and real-time transmission. Broadcasting and relaying safety messages to alert the surrounding vehicles about critical driving situations is considered to be timely...
The bundle protocol (BP) is developed to solve the new problems in deep space exploration. To date, little work has been done in evaluating the performance of BP applied to an interplanetary Internet involving frequent link disruptions. This paper builds a PC-based Deep Space Communication Test-bed. It consists of three parts, the space link simulator, the high-speed Ethernet switch and the Linux-based...
Multimedia sensor network (MSN) has been deployed in many fields owing to its reliability, flexibility and availability of multimedia data. Correspondingly more challenges draw into the QoS guarantee research. In this paper, we establish a comprehensive performance analytical framework for MSN considering both the traffic self-similarity and stochastic service curve of MSN with S-MAC protocol based...
This paper proposed a routing protocol integrating both the characteristic of the flooding-based protocol and forwarding-based protocol. The basic idea of our protocol is to let message be forwarded to the nodes moving toward or closer to destination. When nodes contact with each other, our approach will utilize the path of the node, node's moving direction and velocity to estimate the probability...
NS(Simulator Network) is an object-oriented visual simulator based on large-scale discrete event. It simulates not only the transmission of network data and topology architecture, but also all kinds of IP network circumstance. This paper describes the architecture and characteristics of NS, and also gives the technique and the general process based on NS. The instance of a streaming media applications-based...
We propose a new transmission protocol for two-hop transmission employing rateless coding in the first hop and rateless-network coding in the second hop. In this protocol, communicating pairs (CP) and also relays are partitioned into small clusters; afterwards, each CP-cluster is assigned one relay cluster to improve data transmission. This scheme increases the diversity order (in comparison to the...
This paper proposes a novel relay selection protocol for distributed cooperative networks, that eliminates the effect of asynchronism between different received signals. The suggested protocol maintains a high diversity order, with minimum message complexity and overall time delay, and it also provides a better performance in terms of power consumption and error rates than existing selection protocols...
Chip-multiprocessors need low cost and high performance communication structure. Network-on-Chip (NOC) is a promising candidate because of its high scalability. In this paper, a hybrid circuit-switched (HCS) NOC is proposed. The HCS NOC uses bufferless switch and pipeline channel to construct the on-chip network. A network interface is also designed to make the HCS NOC AMBA-compatible. Packet setup...
In recent years, Peer-to-Peer (P2P) multimedia streaming has become an alternative to cable/satellite TV services. Many P2P streaming applications further provide users with DVD-like operations: play, pause, chapter selection, fast-forward, and rewind. Such a real-time interactive multimedia streaming is commonly referred to as the P2P Video-on-Demand (VoD). To further improve the streaming quality,...
In order for the mobile networks to stay connected to the Internet, Network Mobility (NEMO) is involved with the management of the different types of movements by mobile routers during rapid changes of the Point of Attachment (PoA). Accordingly to achieve seamless handoff with lower delay and packet loss in NEMO environment, it is very important to get better performance of mobility management protocol...
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