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Wireless local networks (WLANs) are being deployed rapidly all over the world, which often contain large numbers of idle APs. The purpose of Green WLAN is to reduce the energy consumption without compromising the quality of service for end-users. In this paper, a dynamic and adaptive control algorithm of AP is proposed in order to save energy and prolong the service lives of APs. It includes AP selection...
Various network QoS algorithms are analyzed to determine strengths and weaknesses. A proposed multi-mode self-adaptive algorithm is implemented in a network model simulation. By means of the simulations results, it is shown that switching between algorithms on the run based on network traffic status can improve network QoS measurements.
There is the problem of absolute discrimination in current Active Queue Management (AQM) algorithms for Differentiated Services, the throughput and link utilization of network are decreased. In this paper we have presented an AQM algorithm, called Weighted-queue-length RIO-C (WRIO). WRIO realizes relative discrimination of different drop precedence, and improves link utilization, especially for the...
In this paper, an admission control (AC) scheme is proposed for handling multiclass Grade of Service (GoS) and Quality of Service (QoS) in Uplink Long Term Evolution (LTE) systems. GoS requirement in conjunction with QoS has been seldom taken into account in previous admission control and resource allocation algorithms for LTE uplink. We propose a novel algorithm for handling the priorities while...
In the highly connected Internet most of domains have more than one interconnection link to different providers. In such a multi-homed scenario destinations for inter-domain traffic may be reachable through multiple egress routers with different offered cost and path performance. In this paper, we address the problem of route selection in a multi-homed stub network to optimize transit costs and paths...
Most of the Quality of Service (QoS) routing mechanisms involve periodic exchange of global state information which causes communication overheads. Therefore, localised routing is the method to avoid this problem. The network in this technique is inferred by the source nodes using statistics which are collected locally. The main aim of this paper is to present new localised algorithm to avoid some...
Channel assignment schemes in Multi-Radio Wireless Mesh Networks (MR-WMNs) usually leave several links sharing the same channel within overlapped transmissions or interference ranges; this is especially true when only one radio is used or when the number of radios is very small compared to the number of orthogonal channels. In order to further improve MR-WMN performance, especially for mobile multimedia...
In NGCN, mobile users can move between heterogeneous networks. In this kind of environment, handoff management is the essential issue that supports the handoff of users between various wireless technologies. Handoff decision, one of the handoff management issues consists of finding the appropriate time to perform the handoff and which cell to hand over in cellular networks. Traditionally, the need...
In many applications the traffic traversing the network has inter-packet dependencies due to application-level encoding schemes. For some applications, e.g., multimedia streaming, dropping a single packet may render useless the delivery of a whole sequence. In such environments, the algorithm used to decide which packet to drop in case of buffer overflows must be carefully designed, to avoid goodput...
Multimedia applications present new challenges to the current networking technology. One of them is Quality of Service (QoS) requirement. Due to the increasing dynamics of traffic introduced by multimedia applications, dynamic and flexible QoS (Quality of Service) control is needed to ensure both QoS satisfaction and resource efficiency. Because integrated service networks are designed to support...
With the increased deployment of WLAN access points (AP), the importance of IEEE 802.11x standard network is also increasing. Mass deployment of WLANs offers the advantage of increased QoS support for multimedia traffic by using an intelligent vertical handover technique combined with an advanced admission control algorithm. In this paper we analyze the performance of three different dynamic load...
The major issue related to the realization of multipath network is the design of suitable dynamic adjustment algorithm of traffic allocation. The design challenge is to guarantee the various qualities of service requirements for all traffic, special the loss rate while minimizing the cost function. In this paper a novel traffic allocation algorithm based on time series prediction and PSO (particle...
In this paper, the performance of traffic based adaptive (TBA) and size based adaptive (SBA) backoff algorithms for IEEE 802.11 DCF has been evaluated. TBA backoff algorithm utilizes contention status in the channel for adjusting the backoff algorithm but SBA backoff algorithm assigns different priority levels based on packet size to traffic loads which is involved with best effort and real time traffic...
Admission control and routing are two key mechanisms for advanced Quality of Service (QoS) and Traffic engineering (TE) support in the data networks. However, traditional QoS and TE solutions usually focus exclusively on routing to achieve network resource usage optimization, while often neglect to give adequate attention to admission control. To provide a more comprehensive solution, a novel approach...
Wireless sensor networks may support heterogeneous applications ranging from classical environmental monitoring, to more demanding integrated surveillance systems based on multimedia traffic. To this extent, we argue that the specific MAC layer solutions must be flexible enough to provide differentiated services based on the context of the specific WSN. In this work, we leverage the SPARE MAC protocol...
In enterprises and residential networks, there are always multiple classes of traffic sharing the limited access bandwidth, and multiple token buckets are used to guarantee the usage of every class. At the same time, network managers hope to utilize the idle resource, in case of the bandwidth for some classes is redundant, for higher classes, as well as lower classes. A bi-direction adjustable multi-class...
Traffic driven based load balancing routing scheme in CogMesh network is proposed. SMC (secondary mesh client) accessing to CMR (cognitive mesh router) using Ad Hoc way is considered in the paper. A novel routing metric was proposed to describe the load state of a path, which was suitable for traffic demand. Choosing a light-loaded route and a light-loaded link guarantees a lower end-to-end delay...
Management is a critical issue in optical networks. Highly impacting in management, routing in optical networks, is often decoupled into both the path selection and the wavelength assignment problems. In the former, shortest path based approaches are often applied to compute paths. Although such approaches offer advantages in terms of network loading, they are restricted by the fact, that routes are...
Designing efficient bandwidth allocation algorithms is a critical issue in EPON networks. In this paper, a novel DBA algorithm is presented to efficiently and fairly allocate bandwidth among different users. This algorithm focuses on delay consideration to implement a cost effective and high delay performance EPON network with QoS support.
In this paper, a novel data burst assembly algorithm which based on control channel availability and traffic type is presented. In this mechanism, a burst is created only if its control packet can be transmitted and can be packed as different length according to traffic type to adapt the network requirement best dynamically. The variable Lstep which defined as the variation of the size threshold,...
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