On applying network coding to wireless ad hoc networks a study of robustness, efficiency and cross layer synergy

... between network layer and application layer The availability of cross- layer information can greatly help both in network layer and in application layer By taking the oﬀered load information from ... physical radio Without such kind of information, transport and application layers cannot adapt (or react) to the additional physical -layer time-varying constraints such as highly variant jitter ... scheme can be overcome Design a cross- layer solution that jointly considers network conditions in the network layer and in the application layer With the cross- layer approach, the application layer...

Báo cáo hóa học: " Research Article On the Throughput Capacity of Large Wireless Ad Hoc Networks Conﬁned to a Region of Fixed Area" pptx

... examined the uniform throughput of large ad hoc networks confined to a region of fixed area It was found that, for a large enough total area, as the total number of nodes increases, the achievable ... achievable throughput can exhibit an up-anddown behavior reaching a a maximum at a critical spatial node density that is proportional to a power of the ratio of the total noise power to the transmitted ... numerical constants b1 , b2 , b1 , and b2 independent of all network parameters such that the uniform per node throughput of an ad hoc network confined to an square region of (dimensionless) area A...

Implementation and performance study of opportunistic network coding in 802 11 based wireless ad hoc networks using qualnet

... message on the performance of opportunistic network coding scheme We then use the findings for further study of network coding scheme on large scale wireless ad- hoc networks We find out there is an ... mobile ad- hoc networks In this thesis we propose to first study and investigate the performance behavior and key control parameters of opportunistic network coding in large scale static wireless ... illustration of network coding, showing how network coding saves bandwidth consumption It shows Alice and Bob to exchange a pair of packets using transmissions instead of Recently the research focus on network...

Báo cáo hóa học: " Research Article On Wireless Ad Hoc Networks with Directional Antennas: Efﬁcient Collision and Deafness Avoidance Mechanisms" ppt

... 20–30] for ad hoc networks with directional antennas are based on the IEEE 802.11 four-way handshake, with some adaptations to take advantage of directional communications Such adaptations include, ... this section More information about directional antenna models is found in [15–18] In wireless ad hoc networks with omnidirectional antennas, there is only one type of neighborhood relationship ... neighbors, directional- omni (DO) neighbors, omni -directional (OD) neighbors, and directional- directional (DD) neighbors When directional antennas are involved, the transmission range not only depends on...

Báo cáo hóa học: " On the Geometrical Characteristics of Three-Dimensional Wireless Ad Hoc Networks and Their Applications" pptx

... represents the local topological status of the wireless ad hoc network To a certain extent, the node locations and their corresponding degrees would affect the configuration of the wireless ad hoc network ... from (3) and reflects the distribution of A in the Y − Z plane Thus, the problem in three-dimensional space can be reduced to the combination of one in one-dimension and one in two-dimension It EURASIP ... relationship between the mean value of the max-flow and the node number of a wireless ad hoc network when the covering radius keeps constant Another important observation is that, if the covering radius...

WIRELESS AD-HOC NETWORKS docx

... Preface VII Section MAC Protocols for Wireless Ad-Hoc Networks Chapter Comparison of the Maximal Spatial Throughput of Aloha and CSMA in Wireless Ad-Hoc Networks B Blaszczyszyn, P Mühlethaler ... for Wireless Ad-Hoc Networks Provisional chapter Chapter Comparison of the Maximal Spatial Throughput of Comparison of the Maximal Spatial Throughput of Aloha and CSMA in Wireless Ad-Hoc Networks ... Maximal Spatial Throughput of Aloha and CSMA in Wireless Ad-Hoc Networks Comparison of the Maximal Spatial Throughput of Aloha and CSMA in Wireless Ad-Hoc Networks http://dx.doi.org/10.5772/53264 10.5772/53264...

Báo cáo hóa học: " A survey of performance enhancement of transmission control protocol (TCP) in wireless ad hoc networks" pptx

... second mechanism, adaptive pacing, is used for regulating the data flow in a more balanced and fair way Adaptive pacing adds an extra interval to the backoff time, which is equal to the transmission ... However, only a single path is used for data transmission and the second one maintained as a backup path to minimise the chance of route unavailability To select a primary path and a backup path, two ... access point; ADSN: ACK duplication sequence number; ACKs: acknowledgements; AODV: ad hoc on-demand distance vector; ATCP: ad hoc TCP; ADV: adaptive distance vector; APS: adaptive packet size; APS-FeW:...

Báo cáo hóa học: " Coherence time-based cooperative MAC protocol 1 for wireless ad hoc networks" doc

... http://jwcn.eurasipjournals.com/content/2 011 /1/ 3 10 11 12 13 14 15 Page 12 of 12 T Korakis, Z Tao, Y Slutskiy, S Panwar, A cooperative MAC protocol for ad hoc networks IEEE Pervasive Computing and ... ITU-R M .12 25 http://www.itu.int/oth/R0A0E00000C/en (2009) doi :10 .11 86 /16 87 -14 99-2 011 -3 Cite this article as: Khalid et al.: Coherence time-based cooperative MAC protocol for wireless ad hoc networks ... respectively Page 11 of 12 Conclusion In this article, we have proposed a novel cooperative protocol termed as IrcMAC for ad hoc networks In contrast to UtdMAC and CoopMACI protocols, IrcMAC protocol...

Báo cáo hóa học: "Research Article OMNeT++-Based Cross-Layer Simulator for Content Transmission over Wireless Ad Hoc Networks" pot

... RadioChannelManager ∗ rcm; RadioChannelManager PathLoss ∗ pl; ReceiverNoise ∗ rn; FastFading ∗ ff; SlowFading ∗ sf; FastFading double getFastFading() { return 1; } double getFastFading(FastFadingInfo ... return 1; } SlowFading FastFadingInfo double getSlowFading() { return 1; } double getSlowFading(SlowFadingInfo ∗ sfi) { return 1; } GroundBasedShadowing SlowFadingInfo Figure 5: Radio channel manager ... multimedia content over hybrid wired /wireless ad hoc networks and the design of innovative radio access schemes Details of the API allowing highfidelity simulations by transmitting bits and bytes over...

Báo cáo hóa học: "Research Article Intelligent Stale-Frame Discards for Real-Time Video Streaming over Wireless Ad Hoc Networks" ppt

... an intelligent early packet discards (I-EPD) scheme for jitter-tolerant video streaming over a multi-hop wireless ad hoc network A video packet temporarily buﬀered at IN on a wireless ad hoc ... paper we propose an intelligent early packet discard (I-EPD) for realtime video streaming over a wireless ad hoc network An IN on the path from a video server to its receiver can intelligently determine ... References [1] Z Liu, G He, and Z Liu, “An adaptive control scheme for real-time MPEG4 video over ad- hoc networks,” in Proceedings of the International Conference on Wireless Communications, Networking...

Báo cáo hóa học: " Research Article QoS-Aware Maximally Disjoint Routing in Power-Controlled Multihop CDMA Wireless Ad Hoc Networks" pdf

... Also, in order to provide assured QoS, we propose multiple disjoint paths (minimum two) routing as opposed to single path routing Single path routing is not reliable The path may be broken during ... are two types of disjoint paths, namely, nodedisjoint paths and link -disjoint paths Node -disjoint paths are also link -disjoint, but not vice versa An example is illus- trated in Figure Paths R1 ... joint power control and maximally disjoint routing is based on SMR, a multipath source routing algorithm Extensions of the proposed scheme to other popular ad hoc routing algorithms such as ad...

Báo cáo hóa học: " Improving TCP Performance over Wireless Ad Hoc Networks with Busy Tone Assisted Scheme" pdf

... The TCP instability problem in 802.11-based wireless ad hoc networks was first reported in [1], and it was further investigated in [2] The TCP unfairness problem in multihop wireless ad hoc networks ... propose a busy tone assisted broadcast and link error detection scheme with low overhead and good energyefficiency, where only the sender needs to transmit two short messages in the busy tone channel ... message, and node advertisement message, and so forth Unlike wired networks, it is very difficult to provide reliable broadcast in wireless ad hoc networks due to the high bit error rate, wireless medium...

Báo cáo hóa học: " Research Article Capacity of Wireless Ad Hoc Networks with Opportunistic Collaborative Communications" pptx

... in wireless networks: eﬃcient protocols and outage behavior,” IEEE Transactions on Information Theory, vol 50, no 12, pp 3062–3080, 2004 [4] M Qin and R S Blum, Capacity of wireless ad hoc networks ... wireless networks, ” IEEE Transactions on Information Theory, vol 46, no 2, pp 388–404, 2000 [2] S Toumpis and A J Goldsmith, Capacity regions for wireless ad hoc networks, ” IEEE Transactions on Wireless ... OST scheme 5.1 Capacity region and uniform capacity The basic concept in the framework of [2] is that of a basic transmission scheme, which describes a possible state of the ad hoc network under...

Báo cáo hóa học: " Research Article Capacity of Wireless Ad Hoc Networks with Opportunistic Collaborative Communications" pdf

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