Situational awareness with real time IP applications over next generation packet processing satellites

Chandrasekharan, Sathyanarayanan; Arnold, Steven; Gopal, Rajeev

doi:10.1109/milcom.2008.4753333

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…The test results (reported earlier in [27]), reflect un-optimized (for network transport and applications) performance. Table V shows the results of the QoS measurements over the besteffort transport.…”

Section: Laboratory Testsmentioning

confidence: 65%

Net‐centric satellite mesh architecture for emergency communication

Gopal

2010

Satell Commun Network

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SUMMARYThis paper introduces a net-centric architecture based on ETSI and TIA Regenerative Satellite Mesh-A (RSM-A) standard that uses satellites with on-board packet switching. An Internet Engineering Task Force (IETF) IP protocol family-based extension of RSM-A for enhanced user interoperability, combined with multiple spot beam satellite implementation facilitates higher capacity, easy deployment and full mesh terminal-to-terminal operation that is required for managing emergency situations. This Net-centric Satellite Mesh (NSM) architecture adequately addresses the current and evolving networking needs for emergency-management information systems that can generate high data rate and real-time multi-media traffic. The NSM architecture supports the evolving IETF Emergency Telecommunications Service standards with packet flow-level admission control for guaranteed packet quality-of-service needed by real-time unicast and multicast traffic over satellite networks. The multi-plane architectural discussion is supported with measurements of selected end-to-end application behavior that validate the technical capabilities of NSM by using a pioneering Ka band satellite system, based on RSM-A, which has recently been deployed in North America.

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Section: Laboratory Testsmentioning

confidence: 65%

Net‐centric satellite mesh architecture for emergency communication

Gopal

2010

Satell Commun Network

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“…MOS measurements were performed to determine listening voice quality and were reported in [17]. The MOS score for the voice call ranged from 4.1 to 4.2, which implies good toll-quality voice calls.…”

Section: Laboratory-based Performance Measurementmentioning

confidence: 99%

Cross‐plane information sharing for QoS in satellite–terrestrial integrated packet networks

Gopal

2011

Satell Commun Network

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SUMMARYThis paper introduces a standards-based Quality-of-Service (QoS) architecture for satellite and terrestrial IP packet network integration to facilitate the evolution of the next generation integrated networks. Crossplane information sharing can extend the reach of cross-layer improvements, typically applied for enhancing throughput and robustness in the wireless networks. Besides supporting real-time interactive applications for all users, such a QoS architecture can also provide a prioritization framework for enhanced service assurance. The satellite packet transport operates in a spectral, power, and hardware resource constrained environment. It needs specific functions for packet classification, scheduling, and propagation, all operating within the broader context of dynamic resource allocations at the media access layer for transporting individual packets and their aggregates. Additional information, made available to these networking functions across the data, control, and management planes can facilitate key decision making at the individual packet flow level with the use of formal connection admission control (CAC). Our QoS scheme links the data and management planes with the use of IP differentiated services (Diffserv) information in the packet headers. Originally designed for packet traffic aggregates, Diffserv can be leveraged to provide QoS for the individual packet flows at specific data rates and packet drop sensitivity. This QoS architecture has been validated with a pioneering regenerative packet processing satellite system and it is also suitable for other networks that support flow-level CAC, operating under dynamic network capacity management.

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“…The test results (reported earlier in 27), reflect un‐optimized (for network transport and applications) performance. Table V shows the results of the QoS measurements over the best‐effort transport.…”

Section: Nsm Experiments and Testsmentioning

confidence: 99%

Asymmetric Retro‐Henry Reaction Catalyzed by Hydroxynitrile Lyase from Hevea brasiliensis

et al. 2010

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Hydroxynitrile lyase from Hevea brasiliensis (HbHNL) is a promiscuous biocatalyst that, besides the native cyanohydrin reaction, also catalyzes the asymmetric Henry reaction yielding (S)‐β‐nitroalcohols with high enantiomeric excess. Since the Henry reaction is reversible, the enzyme can be also utilized for the production (R)‐enantiomers by means of resolution of racemic β‐nitroalcohols. Herein the biocatalytic retro‐Henry reaction is studied using the cleavage of 2‐nitro‐1‐phenylethanol as a model system. The main problem that prevents high levels of conversion or high ee values during the cleavage of the β‐nitroalcohol is the formation of benzaldehyde, which is known to be a strong enzyme inhibitor. The product inhibition is overcome by performing the biocatalytic retro‐Henry reaction in the presence of HCN, which reacts in situ with benzaldehyde and converts it to the less‐inhibitive mandelonitrile. By using such a reaction cascade, it was possible to conduct the resolution practically to completion (95 % ee, 49 % conversion). Furthermore, the catalyst productivity achieved during the resolution was ten times higher than that in the HbHNL‐catalyzed synthesis of (S)‐2‐nitro‐1‐phenylethanol by condensation of benzaldehyde and nitromethane.

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Situational awareness with real time IP applications over next generation packet processing satellites

Cited by 5 publications

References 9 publications

Net‐centric satellite mesh architecture for emergency communication

Net‐centric satellite mesh architecture for emergency communication

Cross‐plane information sharing for QoS in satellite–terrestrial integrated packet networks

Asymmetric Retro‐Henry Reaction Catalyzed by Hydroxynitrile Lyase from Hevea brasiliensis

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