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Recently, considerable attention has been devoted to the potential cognitive femtocell to allow for higher capacity and intelligent coverage, with guaranteed quality of service (QoS) for future indoor services. This interest is because of the fact that femtocells can access a resource, sufficiently and locally, to known users with higher throughput. In this article, cognitive femtocell is proposed...
The performance of TCP-based applications depends on the selection of queue management mechanism in network routers and how well its control decisions are made. Fast Congestion Notification (FN) mechanism enables the two control decisions, packet admissions and congestion control directing, to be made together. This permits sending congestion avoidance notification as early as required, even if the...
Random Early Detection (RED) algorithm, a framework of active queue management (AQM), has been proposed in order to improve the performance of congestion routers due to the increased use of Internet. But, the basic problem of a lag between congestion's occurrence and its remedy remained. To overcome this problem of RED, Explicit Congestion Notification (ECN) proposed by the IETF that allows end-to-end...
Internet “Congestion” occurs when the aggregate demand for a resource (e.g. link bandwidth) exceeds the available capacity of the resource. Resulting effects from such congestion include long delays in data delivery, wasted resources due to lost or dropped packets, and even possible congestion collapse, in which all communication ceases in the entire network. “Congestion control” mechanism, implemented...
Service discovery in Ubiquitous Sensor Networks has been targeted mostly for services available within certain proximity, but the service availability only in close vicinity is no longer feasible in the pervasive and ubiquitous era. In order to address the ubiquity in service discovery, we have proposed a framework that makes use of the Electronic Number Mapping (ENUM) protocol. Our network architecture...
Active Queue Management (AQM) algorithm is important to manage buffers and transfer packets for wired/wireless networks. However, the unresponsive flows to the network congestion control is dangerous to the network equilibrium and Quality of Service (QoS), especially from the point of network resource allocation. In some certain scenarios, the limited network resource (buffers) can be occupied by...
A home Internet gateway is the node that resides between a public network and a home network for computers to share Internet connections. To insert customized queuing and scheduling codes into the embedded Linux kernel is a way to make the Linux-based home Internet gateways support Quality of Service(QoS). It is desirable that the small Linux kernel adopts an efficient queuing and scheduling algorithm...
Wireless mesh networks (WMNs) bring the convenience for daily access and infrastructure construction. To improve the throughput of WMN, more than one Internet gateway can be deployed to a WMN and the network throughput can be improved via well deployment of Internet gateways. Although the route redirection and the dynamic routing metrics can be used to improve the performance of WMNs, more available...
Nowadays, Internet congestion is indicated by dropping packets when the routers buffers are full, or by dropping packets according to an AQM mechanism such as RED. Many mechanisms have been proposed to eliminate or minimize the effect of packet loss and tackle the consequential inefficiency due the retransmission of the dropped packets. Fast congestion notification (FN), that has been evaluated through...
Congestion in computer network happens when the number of transmission requests exceeds the transmission capacity at a certain network point (called a bottle-neck resource) at a specific time. Congestion usually causes buffers overflow and packets loss. The purpose of congestion management is to maintain a balance between the transmission requests and the transmission capacity so that the bottle-neck...
This paper presents an overview of random early detection algorithm and differentiated services on ns2. In the present scenario of computer networks the traffic is increasing exponentially due to which packet losses are also increasing at a great rate. An active queue management in routers and gateways can potentially reduce packet loss rates in the Internet. In this paper we have proposed use of...
Wireless mesh networks are primarily used to provide Internet access by sharing the Internet connections of a limited number of gateways. If traffic is routed in the mesh without considering load distribution, unevenly network congestion may arise and some gateways may rapidly get overloaded, which causes a significant reduction of the network capacity. To address this issue, in this paper we firstly...
It is becoming increasingly common to connect traditional embedded system networks to the Internet for remote monitoring, high-level control and integration. It is necessary to protect each part of the interconnected system from faults and attacks which propagate from the other side. One architectural approach is to add a gateway to the embedded system to receive Internet traffic and disperse data...
In this letter, we question the superiority of current RED, PI and REM active queue management algorithms by proposing an improved droptail gateway. This improved drop tail adopts random packet drop to avoid global synchronization and deadlock of traffic flows; it also try to keep the instantaneous queue size around the predefined value. The simulation results manifest that this improved drop tail...
The merit and demerit as well as the principle of RED algorithm are investigated. To overcome the difficulty in right parameters determination, an enhanced RED algorithm with adaptive parameters is proposed. The simulation results show that this enhanced RED algorithm can effectively reduce average queue length and packet loss. The algorithm has improved the adaptability of the RED algorithm.
Challenges of routing scalability has attracted many research efforts, represented by the works of splitting identifier and locator semantics of IP addresses. A group of identifier-locator (ID/Loc) split approaches is commonly featured with a mapping query service system, independent of the routing infrastructure. This is a significant change of the Internet routing architecture that deserves comprehensive...
The transmission of data is from the mesh routers to gateway by multi-hop and then to Internet. The gateway where the traffic congregates becomes the bottleneck of the network. End-to-end delay with upper bound is one of guaranteed services, and whether the upper bound can obtain the guarantee is a key to present QoS guarantees, implement routing effectively, congestion control and load balance in...
There is a strong need for a new Internet Protocol to be used in the future networks rather than the existing Internet protocol (IPv4). So, IPv6 is coming with new features and improvements for the devices that will be connected to the network. Therefore, some transition mechanisms are required during the time of migration from IPv4 to IPv6 networks. Furthermore, the BDMS has been proposed and designed...
Wireless mesh networks (WMNs) are well-promising future networks especially for ubiquitous connection to Internet. In this paper, we propose an analytical model in order to evaluate the maximum stable throughput of a WMN based on a simplified version of IEEE 802.11s MAC protocol. Our modeling approach is based on a multi-class open queueing network. In this respect, we map some of the important features...
Nowadays Congestion control problem of the intermediate nodes in the Internet has received extensively attention in control community. In this paper, a novel intelligent PID (Proportional-Integral-Differential) controller based on neural networks (PIDNN) for the problem of AQM is presented. Considering a previously developed nonlinear dynamic model of TCP/AQM system and the queue management mechanism...
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