Integrating RFID data from various sources in a value chain is an important requirement for leveraging the full potential of the technology. To facilitate this crucial integration, the global standardization organizat...
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Integrating RFID data from various sources in a value chain is an important requirement for leveraging the full potential of the technology. To facilitate this crucial integration, the global standardization organization GS1 is currently developing a range of service specifications. Yet, the services specified so far do not enable event-based interaction schemes and do not leverage the detection of distributed complex events. In this paper we propose to fill this gap by means of a peer-to-peer based broker network that can realize event-based interaction on top of existing specifications. For this infrastructure we present a new method to improve in-network processing. As shown by our experiments, our method significantly reduces overall system load by exploiting a priori knowledge about the observed processes.
Admission control and bandwidth allocation are important issues in telecommunications networks, especially when there are random fluctuating demands for service and variations in the service rates. In the emerging bro...
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ISBN:
(纸本)0444818340
Admission control and bandwidth allocation are important issues in telecommunications networks, especially when there are random fluctuating demands for service and variations in the service rates. In the emerging broadband communications environment these services are likely to be offered via an ATM network. In order to make ATM future safe, methods for controlling the network should not be based on the properties of present services. We propose one bandwidth allocation method which has this property. Our proposed approach is based on pricing bandwidth to reflect network utilization, with users competing for resources according to their individual bandwidth valuations. The prices may be components of an actual tariff or they may be used as control signals, as in a private network. Simulation results show the improvement possible with our scheme versus a leaky bucket method in terms of cell loss probability, and confirm that a small queue with pricing: can be efficient to multiplex heterogeneous sources.
This paper is a response to concerns about the performance of TCP/IP over high-speed backbone networks such as those based on ATM. We consider two versions of TCP: the widely used Tahoe version proposed by Van Jacobso...
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ISBN:
(纸本)044482023X
This paper is a response to concerns about the performance of TCP/IP over high-speed backbone networks such as those based on ATM. We consider two versions of TCP: the widely used Tahoe version proposed by Van Jacobson, and a more recent proposal (also by Van Jacobson) which uses fast retransmit to recover from losses. We attempt to develop a basic understanding, using analysis and simulation, of these protocols in the regime of high bandwidth-delay products and random loss by considering a single bottleneck link with one-way traffic. Our main results are as follows. For the Tahoe version, rapid growth in window size due to slow start leads to excessive buffer requirements when the bandwidth-delay product is large. This phenomenon does not occur (except as a transient) if fast retransmit is used. However, there are a number of shortcomings that are common to both versions of TCP considered here. Random packet loss leads to a significant deterioration in throughput when the product of the loss probability and the square of the bandwidth-delay product is larger than one. For multiple connections, we find that the throughput of a connection with propagation delay tau is roughly proportional to 1/tau(a), where less than or equal to a less than or equal to 2, sq that the how control mechanism discriminates significantly against connections with larger propagation delays. Our results show that modifications both in the end-to-end congestion control scheme and in the queueing disciplines in the switches may be required for good performance over high-speed backbones.
B-ISDN is envisioned to be the universal networking technology and ATM is the transfer mode of choice for B-ISDN. There has been a tremendous amount of work completed on ATM standards. However, enabling ATM networks r...
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ISBN:
(纸本)044482023X
B-ISDN is envisioned to be the universal networking technology and ATM is the transfer mode of choice for B-ISDN. There has been a tremendous amount of work completed on ATM standards. However, enabling ATM networks requires the design and development of several additional network services that are not within the scope of any standards activity. IBM's high speed networking architecture, Broadband network Services, complements emerging ATM standards and provides a complete architectural framework that enables high speed, multimedia networking while utilizing network resources efficiently. This paper presents a high level review of Broadband network Services and discusses how the challenges of high speed multimedia networks are addressed in this architecture.
The complexity of the path selection algorithms is a function of the network size, and can become significant for very large networks requiring a high call processing rate. A possible way to relax the computational re...
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ISBN:
(纸本)044482023X
The complexity of the path selection algorithms is a function of the network size, and can become significant for very large networks requiring a high call processing rate. A possible way to relax the computational requirement is to cluster the network into a. backbone and several subareas. This decomposition model is based on the typical highspeed network structure: the backbone is the transport network and the subareas include the access nodes. Path selection is run only on a subset of the network nodes, according to the localization of the source and the destination node. However, clustering a network is not an easy task since for large network it may lead to a decomposition that compromises the optimality of the path selection algorithm. In this paper we present a new automatic network clustering technique that leads in most cases to an optimal decomposition, that is the optimal path between two nodes can always be found. The use of this decomposition algorithm leads to a significant speed-up of the path selection algorithm.
This paper presents the features of the BSS: Bus Structure Switching, which complies with the Asynchronous Transfer Mode (ATM) requirements. The main originality of this switch is supported by the sequential scan of t...
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ISBN:
(纸本)0444815120
This paper presents the features of the BSS: Bus Structure Switching, which complies with the Asynchronous Transfer Mode (ATM) requirements. The main originality of this switch is supported by the sequential scan of the N inputs. Each input may deliver at each time slot an information to one output among P, or to a designated group of outputs. The communication is performed through a bus structure. A BSS switch element is of the output - buffer type with no throughput degradation since internal contention is eliminated. This study deals with basic performance parameters (cell delay and cell loss probability) of the BSS switch under a uniform traffic pattern, to dimension the output buffet size.
An experimental prototype of an IP router, interconnecting standard Ethernet LANs by means of ATM networks, is presented. The suite of ATM protocols up to the SAR sublayer has been implemented partially in hardware an...
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ISBN:
(纸本)0444818340
An experimental prototype of an IP router, interconnecting standard Ethernet LANs by means of ATM networks, is presented. The suite of ATM protocols up to the SAR sublayer has been implemented partially in hardware and partially in software. In particular, the physical layer is implemented in hardware with a data rate of 155.520 Mbps while the other functions are software based. The global throughput for this implementation can be up to 6-8 Mbps, fast enough for the considered context. An upgrade of the design is presented where most of the functions up to the AAL protocol are hardware based. The throughput of this upgraded architecture is expected to improve considerably up to several tens of Mbps.
With the advent of high speed packet networks capable of supporting integrated services, there is increasing scope for multi-party applications such as multi-media conferencing, file distribution, video distribution, ...
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ISBN:
(纸本)0444814817
With the advent of high speed packet networks capable of supporting integrated services, there is increasing scope for multi-party applications such as multi-media conferencing, file distribution, video distribution, real-time data collection and computer supported cooperative work. Such applications need to be properly supported by the network in order to encourage their development. This paper presents a layered framework offering the necessary support mechanisms at appropriate levels to make effective and efficient use of networking resources. Two aspects of multicast provision are then dealt with in more detail: first, multicast routing for networks of arbitrary topology and secondly, a flexible set of group management procedures.
Frame Relay is revealing itself as a popular interface far data communication across Wide Area networks. ATM is the transfer method of the future B-ISDN, which is expected to support any kind of service including data...
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ISBN:
(纸本)0444814817
Frame Relay is revealing itself as a popular interface far data communication across Wide Area networks. ATM is the transfer method of the future B-ISDN, which is expected to support any kind of service including data communications. As B-ISDN deployment will be gradual and Frame Relay provides a cheap and efficient access interface, it is envisaged that ATM will not replace Frame Relay immediately, and that both of them will coexist to access the B-ISDN. This paper attempts to identify the scenarios for interworking between Frame Relay and ATM. Possible approaches to give FR service over ATM are introduced, and several ATM Adaptation Layers are explored to find the most suitable to support it. Interworking procedures at the FR-B-ISDN border are also sketched for each of these AALs.
Issues in the, implementation of high performance communication systems for parallel computers are discussed with special reference to the networks of the INMOS T9000 and Meiko CS2.
ISBN:
(纸本)0444817913
Issues in the, implementation of high performance communication systems for parallel computers are discussed with special reference to the networks of the INMOS T9000 and Meiko CS2.
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