The following topics are dealt with: scheduling; mobile ad hoc networks; Internet; optical networking; optical burst switches; ip network; WDM network; multicasting; routing protocol; cellular network; call admission ...
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The following topics are dealt with: scheduling; mobile ad hoc networks; Internet; optical networking; optical burst switches; ip network; WDM network; multicasting; routing protocol; cellular network; call admission control; GPRS; peer-to-peer network; voice-over-ip service; multimedia communication service; multimedia application; IEEE 802.11; grid computing; TCP/ip; network traffic; QoS; wireless sensor network; network security; VPN service; packet switched network.
While various advanced traffic management systems have been deployed all over the world, the number of approaches of the deployment remains two: centralized and distributed. Compared with the centralized system, the d...
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While various advanced traffic management systems have been deployed all over the world, the number of approaches of the deployment remains two: centralized and distributed. Compared with the centralized system, the distributed system provides more reliability, scalability and resource sharing. The distributed system also eliminates the bottleneck caused by the communication of the large amount of traffic data. This paper presents a discussion of the distributed ATMS software, followed by a case study of the Wisconsin statewide ATMS software. Parts of the distributed ATMS system have been operated in Wisconsin for more than 10 years. Their experience is a very valuable resource for the development of ATMS.
This paper proposes a novel programmable framework for QoS support in wireless ipnetworks. The framework is based on classification of iptraffic into two main classes, A and B, where class-A is further divided into ...
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This paper proposes a novel programmable framework for QoS support in wireless ipnetworks. The framework is based on classification of iptraffic into two main classes, A and B, where class-A is further divided into three subclasses. It consists of three main modules: packet classifier, scheduler and admission control module. Packets are classified at network nodes by using differentiated services. Different classes are serviced using priorities. The scheduling is adaptive. For a real time flow, such as CBR and VBR, it adapts to location-dependent bit-errors in the wireless channel by increasing bandwidth share of the affected flow until it reaches its effective throughput. Admission control module is made programmable, providing possibility to reserve part of the bandwidth for lower priority classes to avoid monopolization of the wireless link by higher priority classes.
The paper presents a novel scalable end-to-end routing protocol, HDRA, which combines the characteristics of both hierarchical and distributed routing protocols. HDRA selects a number of network domains to be traverse...
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The paper presents a novel scalable end-to-end routing protocol, HDRA, which combines the characteristics of both hierarchical and distributed routing protocols. HDRA selects a number of network domains to be traversed by a requested route. Only the selected domains are flooded with probing messages. This enables the deployment of flooding-based routing algorithms in large networks. The protocol has smaller setup time because it performs no central routing computation. HDRA does not require global state maintenance. However, it has higher message overheads when compared to PNNI (private network-network interface).
Internet traffic growth and the growing variety of Internet applications require Internet backbone networks to be scalable and have sophisticated quality of service capabilities. Internet backbone routers have evolved...
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Internet traffic growth and the growing variety of Internet applications require Internet backbone networks to be scalable and have sophisticated quality of service capabilities. Internet backbone routers have evolved to have sub-Tbps switching capacity in a single unit but their switch architectures have limited scalability, degrading their quality of service degrade, as the switches get bigger. This paper proposes a scalable switch architecture for ultra-large-scale switch routers. The system structure of the proposed backbone switch router is described and the requirements for the switching capabilities for near future demands are clarified. The new switch architecture using crossbar-based switching fabrics and optical interconnection devices allows a backbone switch router scale up to 82 Tbps, enabling light path switching as well as packet switching. The routing tag and its usage algorithm in the switch and the packaging issues, including the hardware quantities, are also discussed.
As CDMA-based cellular networks mature, the current point-to-point links used in connecting base stations to network controllers will evolve to an ip-based radio access network (RAN) for reasons of lower cost due to s...
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As CDMA-based cellular networks mature, the current point-to-point links used in connecting base stations to network controllers will evolve to an ip-based radio access network (RAN) for reasons of lower cost due to statistical multiplexing gains, better scalability and reliability, and the projected growth in data applications. In this paper, we study the impact of congestion in a best-effort ip RAN on CDMA cellular voice networks. We propose and evaluate three congestion control mechanisms, admission control, diversity control, and router control, to maximize network capacity while maintaining good voice quality. We first propose two new enhancements to CDMA call admission control that consider a unified view of both ip RAN and air interface resources. Next, we introduce a novel technique called diversity control that exploits the soft-handoff feature of CDMA networks and drops selected frames belonging to multiple soft-handoff legs to gracefully degrade voice quality during congestion. Finally, we study the impact of router control where an active queue management technique is used to reduce delay and minimize correlated losses. Using simulations of a large mobile network, we show that the three different control mechanisms can help gracefully manage 10-40% congestion overload in the ip RAN.
The potential use of networks for real time-time high performance control and automation is enormous and appealing. Replacing a widely used PI controller by a new networked controller for networked control capability ...
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The potential use of networks for real time-time high performance control and automation is enormous and appealing. Replacing a widely used PI controller by a new networked controller for networked control capability can be costly and time-consuming. This paper proposes a methodology based on gain scheduling with respect to real-time iptraffic conditions to enhance the existing PI controller so it can be used over ipnetworks with a general network protocol like Ethernet. This paper first describes the gain scheduling approach based on constant network delays using a rational function approach. The formulation is extended to random ip network RTT (round trip time) delays by using the generalized exponential distribution model. Simulation results show that the PI controller with gain scheduling provides significantly better networked control system performance.
Inadequacy is obvious when the conventional capacity allocation (CA) models are applied to ipnetworks. This paper presents several CA models incorporating the recent achievements in self-similarity analysis. These mo...
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ISBN:
(纸本)0780378024
Inadequacy is obvious when the conventional capacity allocation (CA) models are applied to ipnetworks. This paper presents several CA models incorporating the recent achievements in self-similarity analysis. These models can be directly applied to the IntServ and indirectly to the DiffServ.
The DiffServ architecture provides a scalable mechanism for QoS introduction in an ip network. The idea of DiffServ is based on the aggregation of traffic flows at an ingress (or egress) point of a network and ip pack...
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The DiffServ architecture provides a scalable mechanism for QoS introduction in an ip network. The idea of DiffServ is based on the aggregation of traffic flows at an ingress (or egress) point of a network and ip packet marking for different priority flows, according to several classification criteria. In this paper the problem of the improvement and fairness of absolute QoS provisioning to paths established along a DiffServ network on a per router basis is considered. The service rate reconfiguration problem of a router's output link is formally defined, mathematically formulated and solved by means of efficient heuristic algorithms, providing good solutions in reasonable time. Finally, an indicative set of results is provided and concluding remarks are made.
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