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This paper studies the IP network routing algorithm based on mathematical theories and methods. It has analyzed the limitation based on distance vector of routing protocol RIP and based on links the routing protocol OSPF. It proposes an improved Dijkstra algorithm, makes the routers and communication links of the cost (transmission speed and delay) can taken into account. In view of distributed multimedia...
Packet and flow scheduling algorithms for WiMAX has been a topic of interest for a long time since the very inception of WiMAX networks. WiMAX offers advantages particularly in terms of Quality of service it offers over a longer range at the MAC level. In our paper, we propose a scheduling scheme that is compatible with 802.16 MAC protocol and can efficiently serve real time bursty traffic with reduced...
We develop a framework to study differentiated services when there are competing network providers. We adopt a multi-class queueing model, where providers post prices for various service classes. Traffic is elastic and users are Quality of Service (QoS)-sensitive, and choose a queue and a class with one of the providers. We model the relationship between capacity, QoS and prices offered by service...
Owing to the heterogeneity and high degree of connectivity of various networks, there likely exist multiple available paths between a source and a destination. To be able to simultaneously and efficiently use such parallel paths, it is essential to facilitate high quality network services at high speeds. So, traffic splitting, having a significant impact on quality of services (QoS), is an important...
In the original study based on the EDCA, the paper puts forward a concept of priority threshold to control traffics in a node. It makes EDCA mechanisms not only have the characteristics of priority, but also have good fairness. Among the nodes, optimized EDCA mechanism uses slot utilization to reflect the current network status, and changes the maximum and minimum contention window in order to improve...
Traditionally, IP Network planning and design is mostly based on average delay or loss constraints which can often be easily calculated. Jitter, on the other hand, is much more difficult to evaluate but this is particularly important to manage the QoS of real-time and interactive services such as VoIP and streaming video. In this paper, we propose a simple model for the delay jitter that is fast enough...
HCF controlled channel access (HCCA), defined in the IEEE 802.11e document, provides a sample scheduler to allocate transmission opportunity (TXOP) to QoS-aware stations (QSTAs). Since the calculation of TXOP duration is based on mean data rate, it is efficient for constant bit rate (CBR) traffic. For variable bit rate (VBR) traffic, however, delay bound of some admitted traffic flows may be violated...
In this paper, a new delay-enabled EDCF for the transport of real-time traffic over an IEEE802.11e wireless LAN is proposed. The proposed technique will drop any packet belonging to a conversational class when a maximum queueing delay is reached. The packets belonging to an interactive or a background class are not dropped due to the queuing delay. The performance of this new technique is evaluated...
We consider extensions of the design theory and related operating concepts to support multiple levels of Quality of Service (QoS) for priority-based traffic in a transport network that uses p-cycles as the basic protection method. The proposed integrated QoS scheme can provide appropriate transport service for various applications relating to different service categories. Notably this includes in...
Traditional network configuration managements for users' QoS can achieve well performance to some extent, but all of them could not be applied to the next generation network (NGN) directly, such as integrated services (Intserv) and differentiated services (Diffserv) typically. To solve this issue, we propose a framework of dynamic QoS self-configuration (FDQS) in this paper. Utility function and interruption...
We propose and evaluate the performance of a novel handoff scheme for IEEE 802.11 wireless LANs (WLANs) supporting mobile applications. Because of their wide deployment in public areas, supporting seamless, low-latency, handoffs between pairs of adjacent WLANs becomes a crucial requirement for applications such as voice and video over IP. Handoff latency is an important delay that affects the quality...
This paper reports on the results of service performance in FON network - Wi-Fi network where each hotspot has its owner, Fonero, who has priority in service, and the right to grant access to the limited number of visitors of his hotspot. Simulation model developed assuming that users in FON behave similar to the users in Wi-Fi, and taking into account service priority of Fonero. Results of simulation...
Congestion in a Wireless Sensor Network (WSN) can cause missing packets, low energy efficiency, and long delay. Moreover, some applications, e.g. multimedia and image, need to transmit large volumes of data concurrently from several sensors. These applications have different delay and QoS requirements. Congestion problem is more urgent in such applications. To address this challenge, we propose an...
A generic application level rate control (ARC) for scalable video is presented. The ARC is designed to operate between a streaming video application (server-side) and a transport level rate control (TRC). TFRC is used as a reference TRC when evaluating the proposed mechanisms. When using scalable video such as H.264/SVC, incrementation of quality layers may cause significant increase in the sending...
Taking the uplink scheduling technique in 3GPP LTE system into consideration, the two-level buffer state report (BSR) scheme is proposed as a better candidate solution for uplink resource allocation in LTE system and future beyond third-generation system. In the proposed two-level scheme, the second level BSR content is a complement information of the BSR in LTE system which is regarded as the first...
The IEEE 802.16 standard was designed to provide rapid deployment, high bandwidth, and low-cost fixed broadband wireless access (BWA). As an enhancement, IEEE 802.16e standard was developed for further supporting mobility. As media streaming services are extending to mobile stations, it is crucial to minimize the handover delay and service disruption time so as to maintain the sustained connection...
In this paper, a scheduling algorithm suitable for weighted fair queuing scheduling has been studied. With the objective to find the best point of QoS between using network band and cell delay, a new scheduling algorithm based on GPS has been used. The new algorithm is characterized by using SHVC and SCFQ algorithm coordinately. As demonstrated by the simulated results, it is not only guarantees the...
The Intelligent evolutionary algorithm-probability learning based algorithm is applied to multiple constraints Qos(Quality of Service) routing problem of network. The objective function is to minimize the cost and meet multiple constraints. The procedure and the choice probabilitypsilas update strategy of PBIL algorithm are designed according to the characteristics of multiple constraints Qos routing...
A fast rerouting scheme is proposed to guarantee the QoS performance of rerouted path when handling link and node failures. The new scheme is based on deflection routing mechanism and improves on two aspects: first, it can promptly handle single node failure as well as single link failure, second, QoS metric is taken into accounted when calculating recovery routes. Simulation results show that the...
The monitoring system in coal mine has special requirements for data query. Analysis shows that routing in the system should have four features: data-centric routing, supporting query of geographic position, low delay and high reliability of data transmission, robustness of topology. A mobile agent based routing algorithm with mobile sink and a dynamical weight metric which is derived from its current...
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