 Subjects -> AERONAUTICS AND SPACE FLIGHT (Total: 124 journals)
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- Mobility and delay in greedy geographic routing
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Authors: Fraser Cadger; Kevin Curran; Jose A. Santos; Sandra Moffett
Pages: 106 - 119
Abstract: Opportunistic networking and geographic routing both represent fields of research in the area of mobile ad-hoc networking that seek to create dynamic, hop-by-hop, localised paths from source to destination thus enabling connectivity where no end-to-end path may be possible. Where they differ is in their approach to the problem of providing connectivity in a changing network. While geographic routing makes decisions based on physical locations, opportunistic networking seeks to take advantage of node mobility and select nodes that will physically carry the message closer to the destination and reduce the overall hop count. In spite of their differences, the similarity of the two approaches presents the opportunity of combining aspects from both paradigms to create hybrid protocols. This paper attempts to analyse the relationship between mobility and delay in greedy routing for use in designing future QoS-aware hybrid opportunistic-geographic protocols.
Keywords: mobility; delay; greedy routing; geographic routing; location awareness; opportunistic networking; quality of service; QoS; mobile ad-hoc networks; MANETs; mobile networks; context awareness
Citation: International Journal of Satellite Communications Policy and Management, Vol. 1, No. 2/3 (2012) pp. 106 - 119
PubDate: 2012-10-07T23:20:50-05:00
DOI: 10.1504/IJSCPM.2012.049547
Issue No: Vol. 1, No. 2/3 (2012)
- Improving data delivery in opportunistic networks using probabilistic
forwarding-
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Authors: Li-Ping Tung; Cheng-Long Tseng; Ling-Jyh Chen
Pages: 120 - 137
Abstract: As the number of opportunistic networking applications increases, the need for an effective routing scheme is becoming increasingly urgent. We propose the HEC-PF scheme for effective data forwarding in opportunistic networks. The scheme modifies the aggressive forwarding phase of our previous H-EC scheme by implementing a new probabilistic forwarding feature, which decides whether to forward a message to a newly encountered node based on the delivery probability. The performance in terms of delivery latency and completion ratio is evaluated by simulations. The results show that the HEC-PF scheme outperforms the EC and H-EC schemes, and the performance gain is even more substantial when network connectivity is extremely poor. We also show that its completion ratio improves as the maximum forwarding distance or the hop distance considered when calculating the delivery probability increases. The effectiveness of the HEC-PF scheme makes it an ideal solution for effective data delivery in opportunistic networks.
Keywords: opportunistic networks; probabilistic forwarding; delay tolerant networks; routing; HEC-PF; H-EC; HEC; data delivery; delivery latency; completion ratio; simulation
Citation: International Journal of Satellite Communications Policy and Management, Vol. 1, No. 2/3 (2012) pp. 120 - 137
PubDate: 2012-10-07T23:20:50-05:00
DOI: 10.1504/IJSCPM.2012.049548
Issue No: Vol. 1, No. 2/3 (2012)
- DTN content sharing among commuters
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Authors: Armir Bujari; Claudio Enrico Palazzi; Marco Roccetti; Gustavo Marfia
Pages: 138 - 151
Abstract: When discussing vehicular networking we have also to consider the multitude of commuters daily travelling to/from work through public transportation means such as buses, metros, and trains. Indeed, through their smartphones, commuters can generate traffic while moving, thus embodying a significant part of an urban communication scenario. In this context, we discuss a way to port the P2P paradigm into mobile disconnected networks composed by commuters' smartphones. Different from classical P2P file-sharing, users could exchange data in proximity with each other; they can also leverage on peer mobility and encounters in order to extend a requesting peer's reach-area to other local disconnected networks. This is achieved by implementing a DTN-like store-delegate-and-forward communication model over underlying social networks where a peer can delegate unaccomplished data downloads to frequently encountered peers. We show how involving frequently encountered peers/commuters improves the success ratio for the data search request while reducing useless communication overhead.
Keywords: mobile ad-hoc networks; MANETs; delay tolerant networks; DTN; opportunistic file sharing; mobility; working day movement model; mobile networks; public transport; urban communications; P2P paradigm; peer-to-peer; commuters; commuter smart
Citation: International Journal of Satellite Communications Policy and Management, Vol. 1, No. 2/3 (2012) pp. 138 - 151
PubDate: 2012-10-07T23:20:50-05:00
DOI: 10.1504/IJSCPM.2012.049549
Issue No: Vol. 1, No. 2/3 (2012)
- Considering driver behaviour in vehicular delay tolerant networks
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Authors: Kun-chan Lan; Chien-Ming Chou; Ching-Fang Yang
Pages: 152 - 173
Abstract: A key component for vehicular ad-hoc networks (VANET) simulations is a realistic vehicular mobility model, as this ensures that the conclusions drawn from simulation experiments will carry through to the real deployments. Node mobility in a vehicular network is strongly affected by the driving behaviour such as route choices. While route choice models have been extensively studied in the transportation community, as far as we know, the effects of driver behaviour on vehicular network simulations have not been discussed much in the networking literature. In this work, we set out to understand the effects of destination selection vehicular network simulation. We also discuss how different destination selection models affect event broadcasting in ITS application. We conclude that selecting a sufficient level of detail in the simulations, such as modelling of destination selection, is critical for evaluating VANET protocol design.
Keywords: vehicular ad-hoc networks; VANETs; driver behaviour; simulation; destination selection; event dissemination; vehicle communication; delay tolerant networks; DTN; mobility modelling
Citation: International Journal of Satellite Communications Policy and Management, Vol. 1, No. 2/3 (2012) pp. 152 - 173
PubDate: 2012-10-07T23:20:50-05:00
DOI: 10.1504/IJSCPM.2012.049550
Issue No: Vol. 1, No. 2/3 (2012)
- A deterministic multifunctional architecture for highly adaptive small
satellites-
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Authors: Sunday Ekpo; Danielle George
Pages: 174 - 194
Abstract: A deterministic multifunctional architecture design approach for a highly adaptive small satellite system is proposed in this paper. It enables five levels of design customisation of all categories of highly adaptive small satellites; adaptive functional modules implement higher-level customised and reconfigurable mission functions. Each adaptive multifunctional structural unit (AMSU) supports the subsystem functions as a 'structural and functional block' and comes either as a baseline or hybrid. Associated functional sub subsystem components are contained in each AMSU. This removes the conventional structural and functional subsystem boundaries. A meteorology spacecraft mission using a highly adaptive nanosatellite reveals, besides more advanced mission capabilities, 0.6 kg and 1 W mass- and power-savings respectively over a conventional nanosatellite system implementation. This novelty results in adaptive, reconfigurable and multifunctional architectures with economies of scale, timely launch, system-level reliability, flexible integration and test options, cost-effective mass production, post-mission reapplication and optimal performance at the desired mission objectives.
Keywords: adaptive architectures; dynamic redundancy; field programmable gate arrays; FPGA; functional reliability; highly adaptive small satellites; in-orbit adaptation; multifunctional architecture; post-space mission reapplication; reconfigurable ar
Citation: International Journal of Satellite Communications Policy and Management, Vol. 1, No. 2/3 (2012) pp. 174 - 194
PubDate: 2012-10-07T23:20:50-05:00
DOI: 10.1504/IJSCPM.2012.049543
Issue No: Vol. 1, No. 2/3 (2012)
- Error-correcting codes for reliable communications in microgravity
platforms-
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Authors: Décio L. Gazzoni Filho; Taufik Abrão; Marcelo Carvalho Tosin; Francisco Granziera <suffix>Jr.</suffix>
Pages: 195 - 205
Abstract: The PAANDA experiment was conceived to characterise the acceleration ambient of a rocket launched microgravity platform, specially the microgravity phase. The recorded data was transmitted to ground stations, leading to loss of telemetry information sent during the re-entry period. Traditionally, an error-correcting code for this channel consists of a block code with very large block size to protect against long periods of data loss. Instead, we propose the use of digital fountain codes along with conventional Reed-Solomon block codes to protect against long and short burst error periods, respectively. Aiming to use this approach for a second version of PAANDA to prevent data corruption, we propose a model for the communication channel based on information extracted from Cumã II's telemetry data, and simulate the performance of our proposed error-correcting code under this channel model. Simulation results show that nearly all telemetry data can be recovered, including data from the re-entry period.
Keywords: rocket launched microgravity platforms; acceleration data acquisition; PAANDA; error-correcting codes; digital fountain codes; reliable communications; reliability; telemetry information; re-entry; data corruption; simulation
Citation: International Journal of Satellite Communications Policy and Management, Vol. 1, No. 2/3 (2012) pp. 195 - 205
PubDate: 2012-10-07T23:20:50-05:00
DOI: 10.1504/IJSCPM.2012.049544
Issue No: Vol. 1, No. 2/3 (2012)
- A protocol for a message system for the tiles of the heptagrid, in the
hyperbolic plane-
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Authors: Maurice Margenstern
Pages: 206 - 219
Abstract: This paper introduces a communication system for the tiles of the heptagrid, a tiling of the hyperbolic plane. The paper focuses on a short account of an experiment obtained by running a simulation programme.
Keywords: hyperbolic tilings; cellular automata; networks; applications; heptagrid; simulation; communications; message systems
Citation: International Journal of Satellite Communications Policy and Management, Vol. 1, No. 2/3 (2012) pp. 206 - 219
PubDate: 2012-10-07T23:20:50-05:00
DOI: 10.1504/IJSCPM.2012.049545
Issue No: Vol. 1, No. 2/3 (2012)
- Flexibility study on telemetric vehicle emission examination
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Authors: Pak Kin Wong; Chi Man Vong; Weng Fai Ip; Hang Cheong Wong
Pages: 220 - 229
Abstract: The current practice of gasoline engine emission examination is partially based on λ reading. For the λ value of a car over a specific standard, it indicates the car failed the examination. Although modern automobiles have built-in λ sensors to monitor the efficiency of the catalytic converter and can warn the driver when the converter breaks down, mandatory vehicle examination cannot be taken every day for each car. The concept of telemetry with traffic lights is proposed that allows λ data collected from the vehicle on road to be reported immediately at a traffic light. The data can be sent via a radio transmitter in the vehicle to a radio receiver mounted on the traffic light which is connected to a server. So, the authority can monitor the engine emissions via computer networks while the vehicles stop at red traffic lights. Experimental results show that the idea is feasible.
Keywords: vehicle emissions; telemetry; wireless networks; communications; engine emissions; traffic lights; red lights; emissions monitoring
Citation: International Journal of Satellite Communications Policy and Management, Vol. 1, No. 2/3 (2012) pp. 220 - 229
PubDate: 2012-10-07T23:20:50-05:00
DOI: 10.1504/IJSCPM.2012.049546
Issue No: Vol. 1, No. 2/3 (2012)
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