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In this paper, we report an investigation on the impact of large block Forward Error Correction (FEC) with Drop Tail (DT) and Random Early Detection (RED) queue policies on network performance and quality of video streaming. FEC is a technique that uses redundant packets to reconstruct dropped packets, while DT and RED are the most popular queue management policies used in network routers. DT mainly...
The AQM (Active Queue Management) Algorithm such as RED, PI, REM have too long respond time and some other problems. Though it makes some enhancement, the PID (Proportional Integral Differential) active queue management algorithm can not make the queue length converge to expectation with longer delay. Because of self-adapt control of BP (back-propagation) neural network, this issue bring forward a...
Current network situation with its limited resources and excessive users' demands reveals the potential necessity for revolutionary organization and management of these resources. Efficient and effective resource scheduling significantly reduces queuing delay which considered as crucial particularly for sensitive packets such as real-time application. This study investigates in the main four categories...
Influence of the leading vehicle to the follower in a single lane traffic flow and stochastic variations of headways lead to the formation of the vehicle platoons. In this paper we use the analogy between single lane traffic flows and single server queueing systems for the analysis of the vehicle platoons. We derive formulas for the mean number of vehicles in a platoon, mean number of subsequent vehicles...
This paper studies a common traffic problem in China: a large number of bus lines share the same stop. In rush hours, a long queue of buses waiting to get into the stop, which causes a rise of bus delay and a drop of traffic capacity nearby. First, a cellular automaton model is proposed to simulate such traffic scenarios. Second, to re-designing such busy bus stops to enhance efficiency, some principles...
In an urban road network, travel times are not uniquely determined by the traffic states due to stochastic properties of traffic flow, stochastic arrivals and departures at intersections and traffic signal control. As a result, for a given traffic state, a range of travel times (delays) is found. This can be represented by a distribution of travel times (delays). Calibrating a model for the travel...
For the issue of resource allocation in a heterogeneous multi-user downlink OFDMA system with both delay-constrained (DC) and non-delay-constrained (NDC) traffic, this paper proposes suboptimal joint subcarrier and power allocation (JSPA) for channel-aware queue-aware(CAQA) scheduling. The objective is to maximize the sum of all NDC users' logarithmic utility functions (achieving proportional fairness)...
This paper presents a master redundancy technique for improving the availability of synchronization in IEEE 1588. We propose a novel best master clock (BMC) algorithm to take account of link congestion between master and slave nodes. To determine the priority of master nodes, a BMC algorithm with a simple link congestion estimation based on a modified IEEE 1588 message sequence is used. The effectiveness...
Resilient Packet Ring (RPR) is the metropolitan area network (MAN) architecture of based on optimization of packet service, its ring fabric is the part of register insert ring. Register insert ring has the characteristics of time-division multiplexing and space-division multiplexing, and the schedule of ring fabric is simple. It is suitable for fabric of switch. The article uses register insert ring...
This paper proposes a novel Dynamic Priority Time-Threshold-based Queuing bandwidth allocation Scheme for Multimedia services (DPTTQM) in cellular networks. Because future data service will occupy a large portion of all services in next generation mobile networks, there is much significance in improving non-prioritized handoff data call dropping probability of Finite Queuing Adaptive Time-Threshold-based...
In this paper, a quality of service (QoS) based resource allocation for orthogonal frequency division multiplexing (OFDM)-based Cognitive Radio (CR) System with mixed services is proposed. We consider the resource allocation problem for downlink with unoccupied frequency sensed by CR users (CRUs) and total transmission power constraint of the CR base station. In mixed services CR system, the objective...
This paper presents a general framework for optimal task reallocation in heterogeneous distributed-computing systems and offers a rigorous analytical model for the stochastic execution time of a workload. The model takes into account the heterogeneity and stochastic nature of the tasks' service and transfer times, servers' failure times, as well as an arbitrary task-reallocation policy. The stochastic...
A new cross layer path selection scheme with quality of service (QoS) support along urban areas is proposed. First, we introduce a cross-layer approach where the routing decision takes explicit consideration of the application layer objective function. Second, the queueing based mobility model, spatial traffic distribution and probability of connectivity for sparse and dense Vehicular Ad-Hoc Networks...
Recent developments in the field of transmission line monitoring system have led to a renewed interest in wireless sensor networks, which is characterized by the strong real time, high reliability, adaptability, load balancing and so on. However, the bottleneck problem of network transmission which is likely to occur around the sink node must be taken into account. This paper proposes a new cross-layer...
Current Internet core routers provide enough buffer capacity at each output port to keep the link busy for 250 msec. to avoid disrupting TCP flows because of dropped packets. Since link speeds are rising much more quickly than the availability and cost-effectiveness of large high-speed memories, there is now significant interest in reducing these buffers. Queue inferencing (QI) - a passive, external...
Introduction of differentiated services on the Internet has failed primarily due to many economic impediments. We focus on the provider competition aspect, and develop a multi-class queueing network game framework to study it. Each network service provider is modeled as a single-server multi-class queue. Providers post prices for various service classes. Traffic is elastic and there are multiple types...
This paper analyzes the deficiency of the average queue calculation in tradition RED queue, and presents a calculation algorithm for the calculation of RED's average queue based on the current network conditions in order to enhance the self-adaptation of RED and we use NS2 for the simulation. Experimental results show that the improved RED performances better than tradition RED in the middle congestion...
Allusion to the various different requirements QoS's quota such as delay sensitivity of multi-medium business for Multi-media communication in Heterogeneous wireless network, we put forward the attemper arithmetic of classify queue based on multi-medium communication. Grade the now operation according to the factors of flux, delay and error tolerance etc, and the node that participates transmission...
Internet traffic has increased at a very fast pace in recent years. The traffic demand requires that future packet switching systems should be able to switch packets in a very short time, i.e., just a few nanoseconds. Algorithms with lower computation complexity are more desirable for this high-speed switching design. Among the existing algorithms that can achieve 100% throughput for input-queued...
Autonomous vehicle based storage and retrieval (AVS/R) systems offer greater flexibility to improve cycle time and throughout capacity in the transfer of unit loads in high density storage areas. AVS/R systems rely on autonomous vehicles to provide horizontal the movement within a tier and use lifts to provide vertical movement between tiers. In these systems, vehicle interference in the aisles and...
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