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Network coding is a new method by which a multicast network can achieve the network capacity determined by the max-flow and min-cut theorem. This paper shows the mutual exchange of independent information between two nodes in a wireless network which can be efficiently combined with network coding and broadcast property offered by wireless medium. It introduces COPE, an opportunistic approach to network...
The performance of AODV protocol of MANET at the rate of 4G is studied. A network frame is introduced, the network model is set up, and simulations are run in NS2. After analysis the results show that AODV is suitable for the network of low moving speed at the rate of 4G, but not suitable for the network with too high speed. The work has some value in the integration of MANETs and 4G mobile communication...
An effective solution is proposed to enhance capability of the emergency communication by wireless mesh network technology. The characteristic of wireless mesh network technology is analyzed. Based on practical circumstance, a new mesh network structure and topology have been devised, which are applied to meet an emergency. It has improved the router protocol, analyzed its feasibility, and proposed...
In the article the author analyses three main categories of routing protocols used in HF communication networks and studies in detail the application of the table driven routing protocol in the HF Ad Hoc Network. A small-scale HF Hoc Network is designed for the test in the end and results show that table driven routing protocol is appropriate in it.
Ad Hoc is one sort of multi-hop, self-organization wireless network without the fixed base-station. It is the most challenging work in wireless networks and the routing layer attracts more eye than others. AODV is one of a typical kind of routing protocols among these. This paper labors the local repair mechanism of AODV. And two kinds of improved mechanism are presented. More important, an optimized...
Introducing the efficient technology of flow distribution into ad hoc networks can balance the traffic load and improve the performance of networks. Most flow distribution algorithms only focus on the optimization of network routing and the control of congestion, while ignore the condition that low layer's communication links will also affect network traffic flow. In this paper, we propose a new flow...
The vehicle routing problem (VRP) is an important problem occurring in many distribution systems, which is also defined as a family of different versions such as the capacitated vehicle routing problem (CVRP) and the vehicle routing problem with time windows (VRPTW). The ant colony optimization (ACO) is a metaheuristic for combinatorial optimization problems, and the max-min ant system (MMAS) is a...
In this paper, a new routing algorithm applicable for wireless mesh network (WMN) backbone, called hybrid multi-path routing (HMR), is presented. Based on DSR (dynamic source routing), HMR applies multi-path routing to improve the performance and routing fault tolerance of WMN backbone. A hybrid approach which combines the source routing and routing table improves the performance of WMN backbone without...
In this paper, an innovative scheduling is designed for multi-hop multicast in wireless mesh networks, with utilization of concurrent transmission strategy. Since the performance of a multicast mechanism is constrained in a wireless setting due to the interference among local wireless transmissions, we analyze the interference relationships firstly among the transmissions by introducing a graph transformation...
Mobile Ad hoc Network is an emerging research area with practical applications. Due to its fundamental nature, however, a malicious attack may disrupt the route discovery process and significantly affect the Quality of Service delivered by the network In this paper, we introduce a new secure routing protocol, Secure On-demand Source Routing (SOSR), which follows a number of basic techniques of ad...
A contention-based geographic routing (CGR) protocol for mobile ad hoc networks is proposed, which operates in two schemes: greedy-forwarding scheme and void-handling scheme. The greedy-forwarding scheme consists of basic mode and optional mode. In the basic mode, when receiving a data packet from upstream node, intermediate nodes within its forwarding area contend to relay it by waiting for a dynamic...
The main property of wireless sensor networks is limited resource, especially energy. To solve this problem, RCHR (regional clustering hierarchical routing algorithm), a regional-centralized cluster formation algorithm for routing algorithm is proposed. The centralized algorithm will be used at the beginning to overcome the defect that the clusters distribute unevenly. After this round, a regional...
Technologies of ad hoc networks have developed rapidly with the research of wireless networks in recent years. More concern has been put on estimating the network capacity instead of link capacity. To investigate how the three factors, topology of the links, ratio between the number of radios and channels, and channel switch delay influence the network capacity, this paper proposes a single-path routing...
In mobile ad hoc networks, a great deal of routing overhead and delays are incurred by the route discovery and recovery, which seriously impacts on the continuous real-time video transmission quality. Therefore, we propose a new Fast Route Repair (FRR) algorithm that can perform a rapid route recovery with restrained routing overhead for on-demand routing protocol. In FRR, the Minimum Hop Count Table...
Research work of dynamic routing based on traffic engineering is investigated firstly and a new routing algorithm with bandwidth guaranteed is introduced for MPLS networks. It is characterized by taking into account network topology, traffic distribution condition and available bandwidth of links. In this algorithm traffic engineering objective can be translated into path constraint, which combines...
As we know, fast mobile IPv6 (FMIPV6), hierarchical mobile IPv6 (HMIPV6) and fast-hierarchical mobile IPv6 (F-HMIPv6) are enhancements to the standard mobile IPv6 (SMIPV6) protocol for reducing handover latency and data loss, and for localized mobility management. But, some problems still remain, bandwidth within a MAP region is not satisfying yet and lots of IP addresses in HMIPV6 and F-HMIPv6 scheme...
The mechanism of inter-domain routing protocol (IDRP), its structure of protocol data unit, transmitting and dealing with the process of routing updating information and flow control mechanism are specifically analyzed. Based on these introductions, IDRP protocol is simulated and modeled for the specific scenes under OPNET Modeler environment. Under different minimum broadcasting cycle, cycle of path...
In order to solve the disadvantage of traditional "special line" networking, and ameliorate limitation of traditional IP network, frame relay and the ATM network. A VPN networking project which based on MPLS is put forward. Then analyze the customer data transmitting process of MPLS VPN in detail. Some simulation scenes are introduced by OPNET, get the results that MPLS VPN has lower delay...
Wireless sensor network (WSN) consists of tiny nodes with sensing, actuating, computation, wireless communications capabilities. Because of node's limited energy, many routing, topology control, media access control (MAC) protocol have been specially designed. This paper discussed power management of topology control, media access control protocol and routing protocol in wireless sensor network. Based...
Geographic routing has been considered as an efficient, simple, and scalable routing protocol for wireless sensor networks since it exploits pure local location information instead of global topology information to route data packets. Geographic routing requires the sources nodes to be aware of the location of sinks. Most existing geographic routing protocols merely assume that source nodes are aware...
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