position based ad hoc routes in ad hoc networks
Báo cáo hóa học: "Location based spectrum sensing evaluation in cognitive radio networks" pptx
... section ‘Interference modeling’ section depicts the details of interference modeling Our simulation results are given in ‘Simulation results’ section Finally, we conclude this article in ‘Concluding ... small radius of the network (i.e., Ra = 100) is capable of outperforming that with a large radius of the network (i e., Ra = 500) Consequently, the spectrum sensing with jointly taking the fading ... detection and false alarm jointly taking the fading and the location of SUs into account, i.e., the probabilities of detection and false alarm are averaged over all fading states and all locations...
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báo cáo hóa học:" Research Article Very Low-Memory Wavelet Compression Architecture Using Strip-Based Processing for Implementation in Wireless Sensor Networks" potx
... shifting the data memory unit and the branch instruction unit one stage forward In the traditional MIPS index addressing method, an offset value is added to a pointer address to form a new memory address ... address is first obtained by adding “4” to the content of register $t0 Then, an indirect addressing method “lw $t2, $t0” is used to load the word at the memory address contained in $t0 into $t2 The register ... results in a fast encoding process since the significance information can be readily obtained from the buffers during the SPIHT-ZTR coding One/Multi-Pass downward Scanning—Listless SPIHT-ZTR Coding...
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Báo cáo " GA-based dynamic survivable routing in WDM optical networks with shared backup paths " pdf
... divided into path protection and link protection In the former, a working path and a link-disjoint protection path are pre-computed for each connection In the later, each link of the working path ... lightpath In addition, we introduce a general formula for determining the key parameter in the new fitness function Our algorithm is very attractive in that it provides low blocking probability by adopting ... performance in terms of blocking probability The main limit of PIBWA method is that it uses a set of fixed alternate link-disjoint routes, so it exists a big space to improve the network performance In...
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Combinatorics based energy conservation methods in wireless sensor networks
... there are only a finite number of points in Finite Geometry A point can only be defined when two lines intersect By the term “line”, a line need not be a straight line or of finite length Therefore, ... of CSBDbased schemes to three main categories of sensor networks – Agent -based sensor networks, Query -based sensor networks, and Ad- hoc and sparse sensor networks Each category of sensor networks ... on based on CSBD schedules In [27], the 37 authors introduced the concept of a network being connected within some finite time, instead of being connected at all times We formally define: Definition...
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Báo cáo hóa học: " Research Article Tree-Based Distributed Multicast Algorithms for Directional Communications and Lifetime Optimization in Wireless Ad Hoc Networks" pptx
... communications for providing longlived broadcasting/multicasting in wireless ad hoc networks Our focus is on establishing source-initiated multicast trees to maximize network operating time in energy-limited ... by the shaded sector in Figure 5(a) There is no any other link included in the tree in the following grow operation Step In the second iteration, the link (4, 1) is found and added into the tree ... Cheng, J Sun, M Min, and D.-Z Du, “Energy-efficient broadcast and multicast routing in ad hoc wireless networks, ” in Proceedings of the 22nd IEEE International Performance, Computing and Communications...
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Báo cáo hóa học: " Authentication Based on Multilayer Clustering in Ad Hoc Networks" pptx
... costs in terms of processing and networking overhead for the increased security that it offers In this paper, we examined the certification process for clustering routing protocols in ad hoc networks, ... “Securing Ad Hoc networks, ” IEEE Network, vol 13, no 6, pp 24–30, 1999 [8] M Steenstrup, “Cluster -based networks, ” in Ad Hoc Networking, C E Perkins, Ed., chapter 4, pp 75–138, Addison-Wesley, Reading, ... Clustering -based architecture 2.1 Clustering in ad hoc networks A comprehensive overview of different clustering strategies is presented in [8] In this section, we present several of the cluster-based...
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Báo cáo hóa học: " Traffic-Dependent and Energy-Based Time Delay Routing Algorithms for Improving Energy Efficiency in Mobile Ad Hoc Networks" doc
... energy -based time delay routing (EBTDR) algorithm in the existing DSR protocol by introducing a delay in forwarding the packets by nodes, which is inversely proportional to the remaining energy ... provides a more optimized solution by considering the link traffic in an active network In HER algorithm, each node, instead of adding the remaining energy level, adds a cost metric to the route request ... having long transmission ranges, with the understanding that more nodes involved in forwarding packets can increase the end-to-end delay In addition, since the MTPR does not consider the remaining...
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Báo cáo hóa học: " Position-Based Relaying with Hybrid-ARQ for Efficient Ad Hoc Networking" potx
... 4.4 Diversity combining versus code combining HARBINGER with incremental redundancy and code combining always outperforms its repetition coding and diversity Position- Based Relaying with Hybrid-ARQ ... fast HARBINGER with diversity combining and code combining under the same conditions used in Figure 4.5 combining counterpart However, code combining is more complex than diversity combining, and ... improvement of code combining over diversity combining becomes marginal If we further take into account the processing energy savings in the receiver, diversity combining turns out to be a very...
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The study of TCP performance in IEEE 802 11 based mobile ad hoc networks
... wired networks, TCP performs poorly in Mobile Ad Hoc NETworks (MANETs) This is because TCP’s implicit assumption that all packet losses are due to congestion is invalid in mobile ad hoc networks ... presented, including the current TCP study in MANETs and the modelling of TCP in the Internet, on which this research is based In Chapter 3, we investigate the TCP performance without considering wireless ... herein These are the study of TCP performance in ad hoc networks and the mathematical approaches to model TCP in the Internet 2.1 2.1.1 TCP in MANETs Challenges for TCP in MANETs Unlike wired networks, ...
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Empty cell management for grid based resource discovery protocols in ad hoc networks
... should be evenly spread in the network 2.3.2.1 Creating a dominating set In [26], a dominating set is created to handle the discovery of services A dominating set is defined as a set that nodes ... for managing Chapter Introduction communications in their vicinity Such architecture requires large investments in order to deploy these expensive infrastructures Upgrading of such networks has ... processed in the backbone using the links that are maintained between backbone nodes This approach generates high overhead in a mobile environment because the backbone nodes have to maintain the...
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Implementation and performance study of opportunistic network coding in 802 11 based wireless ad hoc networks using qualnet
... originatingNodeId; int sequenceNumber; int originatingProtocol; int numberOfHeaders; int headerProtocols[MAX_HEADERS]; int headerSizes[MAX_HEADERS]; Figure 6: Message structure in QualNet Some of the fields ... message in the layer short instanceId; short eventType; // Message's Event type …… MessageInfoHeader infoArray[MAX_INFO_FIELDS]; int packetSize; char *packet; NodeAddress originatingNodeId; int sequenceNumber; ... coding scheme independent of routing protocol, thus making the algorithm very flexible at difference scenarios by cooperating with the suitable routing protocol instead of integrating with ETX based...
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Efficient core selection for multicast routing in mobile ad hoc networks
... UNIVERSITY OF TECHNOLOGY AND ENGINEERING Binh Minh Nguyen EFFICIENT CORE SELECTION FOR MULTICAST ROUTING IN MOBILE AD HOC NETWORKS GRADUATION THESIS Faculty of Information Technology Supervisor: ... participating, the network topology, link state, Which are not available or too expensive to acquire in mobile ad hoc networks There are many proposed protocol for multicast routing in mobile ad hoc networks, ... Internet Grouping Management Protocol Internetwork Operating System Internet Protocol Local Area Network Link-State Advertisement Mobile Ad Hoc Networks Multicast Ad hoc On Demand Distance Vector Multicast...
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Sprite: A Simple, Cheat-Proof, Credit-Based System for Mobile Ad-Hoc Networks potx
... http://gunpowder.stanford.edu/˜laik/projects/adhoc/mitigating.pdf [5] L Buttyan and J P Hubaux, “Enforcing service availability in mobile ad- hoc WANs,” in IEEE/ACM Workshop on Mobile Ad Hoc Networking and Computing (MobiHOC), Boston, ... Baker, “Mitigating routing misbehavior in mobile ad hoc networks, ” in Proceedings of The Sixth International Conference on Mobile Computing and Networking 2000, Boston, MA, Aug 2000 [Online] Available: ... Cooperation of nodes - fairness in dynamic ad- hoc networks, ” in Proceedings of IEEE/ACM Workshop on Mobile Ad Hoc Networking and Computing (MobiHOC) IEEE, June 2002 [Online] Available: http://lcawww.epfl.ch/Publications/LeBoudec/...
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Security in Ad Hoc Networks potx
... [in ASCII format] [9] Kärpijoki, V Signalling and Routing Security in Mobile Ad Hoc Networks Proceedings of the Helsinki University of Technology, Seminar on Internetworking - Ad Hoc Networks, ... [in ASCII format] [12] Mäki, S Security Fundamentals in Ad Hoc Networking Proceedings of the Helsinki University of Technology, Seminar on Internetworking - Ad Hoc Networks, Spring 2000 ... Aspects Ad hoc networks may apply either hierarchical or flat infrastructure both in logical and physical layers independently As in some flat ad hoc networks the connectivity is maintained directly...
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Báo cáo toán học: " A novel algorithm to form stable clusters in vehicular ad hoc networks on highways" doc
... Seed, Supporting inter-vehicular and vehicle-roadside communications over a clusterbased wireless ad- hoc routing algorithm, in Proceedings of the Winter International Symposium on Information ... clustering All clustering algorithms incur some additional signaling overhead to Page-20 form and maintain their cluster structures The clustering overhead consists of: HELLO packets overhead, cluster ... stability can also in uence the signaling overhead A frequently changing clustering structure results in an increase in maintenance messages and thus increasing the load on nodes From the figure, we...
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Báo cáo toán học: " Probabilistic framework for opportunistic spectrum management in cognitive ad hoc networks" potx
... sensing given the inherent inaccuracy of spectrum sensing Page of 15 Coordinated Sender-Receiver Sensing In ad hoc environments in which nodes are exposed to different parts of the network, the interference ... SU-TX Receiving Acknowledgement tx (Pint rx (Pint if receive(ACK) and Rmin < R(i) then max−1 Single_SU = increase(Rmin) else current_spectrum = Single_SU = Rmin = R1 end if (i) E[Pint ⎧ 2 (i) ... active links) that are time shared in a fashion that is reminiscent of spatial reuse patterns in cellular networks In [10], a joint admission control and resource scheduling policy is proposed based...
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Báo cáo hóa học: " Probabilistic framework for opportunistic spectrum management in cognitive ad hoc networks" pdf
... sensing given the inherent inaccuracy of spectrum sensing Page of 15 Coordinated Sender-Receiver Sensing In ad hoc environments in which nodes are exposed to different parts of the network, the interference ... SU-TX Receiving Acknowledgement tx (Pint rx (Pint if receive(ACK) and Rmin < R(i) then max−1 Single_SU = increase(Rmin) else current_spectrum = Single_SU = Rmin = R1 end if (i) E[Pint ⎧ 2 (i) ... active links) that are time shared in a fashion that is reminiscent of spatial reuse patterns in cellular networks In [10], a joint admission control and resource scheduling policy is proposed based...
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Báo cáo hóa học: " Delay-throughput analysis of multi-channel MAC protocols in ad hoc networks" ppt
... Multi-channel Mac for Ad Hoc Networks: Handling Multichannel Hidden Terminals Using a Single Transceiver, in 5th ACM International Symposium on Mobile Ad Hoc Networking and Computing, MobiHoc ‘04, 222–233 ... Quality of Service Provisioning in Ad hoc Wireless Networks: A Survey of Issues and Solutions Ad Hoc Networks 4, 83–124 (2006) L Kleinrock, F Tobagi, Packet Switching in Radio Channels: Part I-Carrier ... hopping pattern or have individual hopping patterns In multi-channel WLANs the common hopping approach is used for example in Channel-Hopping Multiple Access (CHMA) which was introduced in [11] In...
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Báo cáo hóa học: " A survey and taxonomy of distributed certificate authorities in mobile ad hoc networks" doc
... even in the destination cluster or position Also, we can consider two kind of client nodes mobility, nodes mobility inside the nodes administrative domain and between the administrative domains ... bootstrapping, applying a DCA private key, joining a new CH, evicting an existing CH, refreshing CH shares In Bootstrapping operation, to construct the shared key and establish a (k,n) threshold sharing ... for mobile wireless ad hoc networks, Technical Report, Sandia National Laboratories, (2003) G Chaddoud, K Martin, Distributed certificate authority in cluster -based ad hoc networks Wireless Communications...
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