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12th SPIE Mobile Robots conference

作者： Gage, DW Space & Naval Warfare Syst Ctr San Diego San Diego CA 92152 USA

ISBN: (纸本)0819426423

Communications and communications protocols will play an important role in mobile robot systems able to address real world applications. A poorly integrated "stack" of communications protocols, or protocols which are poorly matched to the functional and performance characteristics of the underlying physical communications links, can greatly reduce the effectiveness of an otherwise well implemented robotic or networked sensor system. The proliferation of internet-like networks in military as well as civilian domains has motivated research to address some of the performance limitations TCP suffers when using RF and other media with long bandwidth-delay, dynamic connectivity, and error-prone links. Beyond these performance issues, however, TCP is poorly matched to the requirements of mobile robot and other quasi-autonomous systems: it is oriented to providing a continuous data stream, rather than discrete messages, and the canonical "socket" interface conceals short losses of communications connectivity, but simply gives up and forces the Application layer software to deal with longer losses. For the Multipurpose Security and Surveillance Mission Platform (MSSMP) project, a software applique is being developed that will run on top of User Datagram Protocol (UDP) to provide a reliable message-based Transport service. In addition, a Session layer protocol is planned to support the effective transfer of control of multiple platforms among multiple control stations.

关键词： mobile robots security sensors surveillance internet TCP/IP UDP reliable transport datagram

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Adaptive transport protocol for multimedia communication

Adaptive transport protocol for multimedia communication

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Proceedings of the 1998 International conference on Multimedia Computing and systems

作者： Dwyer, Dane Ha, Sungwon Li, Jia-Ru Bharghavan, Vaduvur Univ of Illinois at Urbana-Champaign Urbana-Champaign United States

In this paper, we propose a novel approach for effectively supporting multimedia packet flows in an internet environment. The following are the key contributions of this paper: (a) we propose a new transport protocol called HPF that supports multiple interleaved reliable and unreliable data sub-streams, (b) we decouple the congestion control and reliability mechanisms that are integrated in TCP - this allows us to provide congestion control for unreliable streams as well as reliable streams, and (c) we use priorities within sub-streams of a packet flow as application-defined hints for the link level scheduler to drop packets during congestion. We show through performance measurements in our experimental testbed that our approach can provide effective support for heterogeneous packet flows in the presence of dynamic networking resources.

关键词： network protocols

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network management applications for wireless local loop

Network management applications for wireless local loop

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9th Mediterranean Electrotechnical conference (Melecon 98)

作者： Vucetic, J Kline, P Dynam Telecommun Inc Germantown MD 20874 USA

ISBN: (纸本)0780338790

In the last several years, wireless local loop (WLL) has emerged as an attractive alternative to wireline access to telephone services. This paper focuses on the wireless local loop market, technology, management and operations. WLL has applications in both highly developed areas, as well as in rural and remote areas with underdeveloped or no telephone infrastructure. WLL represents a fast and inexpensive way to provide new or additional telephone lines (e.g. for internet). In order to be a real alternative to wireline telephone networks, WLL should provide high quality, reliability and availability of service, as well as secure communications. These requirements imply a need of WLL network management system with functionalities similar to those incorporated in a wireline network management system. Despite a significant need for network management in WLL networks, there has been almost no such proposals nor deployments. Existing network management systems provide management of WLL up to the base stations, but not up to the wireless local loop terminals (FWT), even though the installation and maintenance of the terminals currently represent 50% to 80% of the cost of the entire WLL network operations. To support network management in WLL, the terminals should include an extended protocol in addition to standard call processing capabilities. This protocol enables the following network management features: secure access, remote configuration, software download, control, maintenance, diagnostics, performance measurement, statistics collection, programmable scheduled reports, dialing rules and services, security, alarm generation, billing, as well as management of the operations and maintenance staff in a network operations center of a telephone company. The proposed wireless local loop terminals with the network management system can be adapted easily and remotely (over the air) to different international telephony standards and services, or remotely upgraded with new so

关键词： Wireless telecommunication systems

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On programmable universal mobile channels in a cellular internet 98

On programmable universal mobile channels in a cellular Inte...

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4th Annual ACM/IEEE International conference on Mobile Computing and networking, MobiCom 1998

作者： Liao, Raymond R.-F. Campbell, Andrew T. Center For Telecommunications Research Columbia University 530 W. 120th Street New YorkNY10027 United States

ISBN: (纸本)9781581130355

In this paper we introduce universal mobile channel, a new mobile communications abstraction that enables users and service providers to program application-specific adaptive mobile services into a cellular internet. Universal mobile channels are capable of supporting distinct adaptive quality of service control and mobility management services over the same cellular access network infrastructure. Built on a split-level adaptation control scheme that operates at the application and network levels, universal mobile channels offer a set of well defined open programmable interfaces to actively exploit the intrinsic scalability of adaptive mobile applications in cellular IP networks. Universal mobile channels can be programmed and expose interfaces that include: (i) utility curves, which capture the adaptive nature of mobile applications in terms of the range of bandwidth over which they can successfully operate;(ii) adaptation policy, which enables adaptive mobile applications to program per-session adaptation time-scales and bandwidth granularities realizing novel application-specific adaptive services;and (iii) session policy, which enables users to specify the relative importance of flows/sessions within the same universal mobile channel. To maintain adaptive services, universal mobile channels periodically probe the cellular access network using a distributed network algorithm achieving utility-based max-min fairness. © Copyright ACM 1998.

关键词： Quality control

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Adaptive packet marking for providing differentiated services in the internet

Adaptive packet marking for providing differentiated service...

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International conference on network Protocols

作者： Wu-chang Feng D.D. Kandlur D. Saha K.G. Shin Department of EECS University of Michigan Ann Arbor MI USA Network Systems Department IBM Thomas J. Watson Research Center Yorktown Heights NY USA

This paper examines the use of adaptable priority marking for providing soft bandwidth guarantees to individual connections or connection groups over the internet. In contrast to other proposals for service differentiation which focus on providing firm performance guarantees, the proposed scheme does not require resource reservation for individual connections and can be supported with minimal changes to the network infrastructure. It uses modest support from the network in the form of priority handling for appropriately marked packets and relies on intelligent transmission control mechanisms at the edges of the network to achieve the desired throughput levels. The paper describes the control mechanisms and evaluates their behaviour in various network environments. These mechanisms are shown to have several salient features which make them suitable for deployment in an evolving internet.

关键词： Web and internet services Bandwidth Proposals Telecommunication traffic Monitoring Intelligent networks Argon Read only memory Throughput Resource management

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Defense Information System network/NIPRNET modeling and analysis for unclassified ATM network

Defense Information System Network/NIPRNET modeling and anal...

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MILCOM, Military Communications conference

作者： S. Hadjipanteli P. Kumar S. Wang Defense Information Systems Agency DISA D84 C41 Systems Studies and Analysis Arlington VA USA

The Defense Information System network (DISN) model for ATM services provides performance evaluation and prediction of the DISN ATM services network. The DISN/NIPRNET modeling results for ATM services show that the addition of the ATM network to DISN/NIPRNET CONUS (continental US) network improves network performance. The system modeling and analysis was done mainly using Netmaker XA and MiiDAS tools with input traffic collected at individual nodes/routers in the network. Results and recommendations of this study are presented.

关键词： Information systems Information analysis Asynchronous transfer mode Telecommunication traffic Bandwidth Traffic control Costs internet Videoconference Load modeling

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Dynamic rate control mechanism for large scale sessions

Dynamic rate control mechanism for large scale sessions

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International conference on Information networking

作者： Kyungran Kang Kilnam Chon Computer Science Department Korea Advanced Institute of Science and Technology Daejeon South Korea

ISBN: (纸本)0818672250

The network environments of the internet Multicast session performance are various. The size of internet community gets bigger and bigger and the variety gets deepening. This paper suggests to build a barrier on every link to restrict the amount of data flowing into the network. Each link has threshold value to specify the requirement for the packets. Multimedia stream is encoded into multiple layers and each layer has its own TTL value. The lowest layer has the largest TTL and the highest layer has the smallest TTL. The threshold is modified according to the traffic of the network and that of the link. It helps the network and the links avoid congestion and make full use of available network capacity.

关键词： Large-scale systems Streaming media Bandwidth internet IP networks Computer networks Videoconference TV broadcasting Application software Digital multimedia broadcasting

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Efficient net access scheduler in MIL-STD-188-220A

Efficient net access scheduler in MIL-STD-188-220A

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MILCOM, Military Communications conference

作者： C.J. Yoon C. Chiu Chan Network Systems Department ITT Aerospace Communications Division Clifton NJ USA

The presence of multiple stations on a single net requires a method for controlling the net access opportunities for each station. In order to minimize conflicts, various net access delay (NAD) schemes have been proposed to access CSMA timing slots randomly for channel requests. The current load factor NAD (L-NAD) algorithm used the load factor (F/sub load/) which was computed based on a neighboring station's precedence level and the number of FMUs required to transmit all of the data at the precedence level. It is desirable to adjust the scheduling interval to give neighboring stations with higher priority or longer queues of equal priority more opportunities to transmit. Since the NAD scheduler algorithm is a most critical control factor for network performance, the current L-NAD is modified to improve further the performance of the tactical internet division and below (TIDB).

关键词： Traffic control Processor scheduling Scheduling algorithm internet Telecommunication traffic Protocols Intelligent networks control systems Delay Multiaccess communication

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Total acknowledgements: a robust feedback mechanism for end-to-end congestion control

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performance Evaluation Review 1998年第1期26卷 274-275页

作者： Waldby, J. Madhow, U. Lakshman, T.V. Univ of Illinois Urbana United States

The internet transport protocol, TCP/IP, uses cumulative acknowledgements (CACKs), which provide a robust but minimal mechanism for error recovery which is inadequate for heterogeneous networks with random loss. The contributions of this paper are as follows: (a) We show that a simple enhancement of CACK provides sufficient information for end-to-end congestion control. (b) We devise a novel ACK format that uses TACKs for congestion control, and negative ACKs (NACKs) for efficient error recovery. (c) WE use the TACK+NACK acknowledgement format as the basis for a new transport protocol that provides efficient error recovery and dynamic congestion control.

关键词： network protocols

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A quality control mechanism for networked virtual reality system with video capability

A quality control mechanism for networked virtual reality sy...

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IEEE International conference on Multimedia Computing and systems (ICMCS)

作者： K. Fujikawa Seiwoong Oh Shinji Shimojo T. Taira D. Kado H. Miyahara Osaka City University Osaka Japan Sony Corporation Tokyo Japan Tongmyong University of Information and Technology busan South Korea Nara Institute of Science and Technology Nara Japan Osaka University Osaka Japan

Introduction of motion video including live video into networked virtual reality systems makes virtual spaces more attractive. To handle live video in networked virtual reality systems based on VRML, the scalability of networked virtual reality systems becomes very important on the internet where the performance of the network and the end systems varies dynamically. We propose a new quality control mechanism suitable for networked virtual reality systems with live video capability. Our approach is to introduce the notion of the importance of presence (IoP) which represents the importance of objects in virtual spaces. According to IoP, the degree of the deterioration of object presentation will be determined in case of the starvation of system resources.

关键词： Quality control Virtual reality Electrical capacitance tomography Video sharing Space technology internet Navigation Avatars Scalability Information technology

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