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QoS of applications in an edge node of mobile edge computing (MEC) could degrade due to congestion of wireless access or short of mobile edge computing resource. In order to improve QoS such as TCP throughput, we propose a VM migration method, which takes a VM from congested node to another node in a mobile edge. Users can choose a far but less-congested node, instead of a near but congested node...
This paper evaluates throughput characteristics of a multi-hop network, where a relay node itself has own traffic as well as relays transit traffic. In addition, it also has an individual per-flow scheduling such as weighted round-robin scheme to send transit and own data farther. The best route is determined in terms of various QoS criteria such as total throughput and relay node throughput. Novelty...
To enhance the QoS performance in saturated multihop adhoc networks, it is essential to have cooperative algorithms for MAC layer contention resolution and TCP layer congestion control. This paper proposes a cross layer approach that modifies the back off mechanism and congestion control technique using Fibonacci sequence. Due to the golden section property of Fibonacci sequence, contention and congestion...
It is emerging to deploy multihop cellular networks (MCNs) for increasing cell capacity and to provide large coverage to mobile users without increasing infrastructure cost. It very much decreases the dead-spot and hot-spot problems with rapidly growing mobile users in cellular networks. However, channel assignment is the most important concern in these networks. Quite a few recent proposals has been...
Recently, video transmission over HSDPA has attracted more and more attentions. The traditional scheduler in HSDPA is designed to meet the QoS requirements such as delay, throughput, fairness and so on. In order to deeply study the performance of video transmission over HSDPA, we make a comprehensive research for the eight state-of-the-art scheduling schemes in HSDPA, such as RR, MAX C/I, PF, EDF,...
Multihop tactical network applications require that mission-critical data should be guaranteed to be delivered to their corresponding targets in time. However, end-to-end QoS (Quality of Service) assurance in multihop networks is a very challenging topic. Several schemes have been proposed to provide end-to-end delay assurance for multihop wireless network environment. However, these schemes do not...
Mobile network operators are currently preparing the introduction of QoS differentiation mechanisms in their 3G networks, as a means to support service-specific quality requirements, to enable the offering of distinct subscription forms and/or to enhance the resource efficiency and hence network capacity. In this paper we quantify the attainable performance and/or capacity gains from introducing QoS...
Motivated by the fact that when selfish users choose their policies independently without any coordination mechanism, Nash equilibria could result in a network collapse, we develop in this paper a hierarchical distributed learning framework for decision-making in heterogeneous cognitive networks. We introduce the Nash-Stackelberg fuzzy Q-learning, with the network as leader that aims at maximizing...
A spectrum leasing mechanism is proposed for the coexistence between a primary and a secondary network that is based on cooperation and opportunistic routing. The primary network consists of a source and a destination communicating via a number of primary relay nodes. In each transmission slot, the next hop is selected in an on-line fashion based on the decoding outcomes in the previous transmissions...
Multi-hop Cellular Networks have recently emerged as a promising technology to overcome the current limitations of cellular systems through the integration of cellular and ad-hoc networking technologies. Several studies have addressed the challenges of Multi-hop Cellular Networks based on Mobile Relays, and demonstrated their performance and potential to improve the user-perceived Quality of Service...
HSDPA (High Speed Downlink Packet Access) is drawing great attention as the 3.5G technology capable of providing higher data rate packet switch services over Universal Mobile Telecommunication System (UMTS) to support broadband services like multimedia conferencing, VoIP, or high-speed internet access. The paper proposes the use of a Learning Vector Quantization (LVQ) Neural Network able to estimate...
It is difficult to provide QoS guarantees for streams in wireless network based on IEEE802.11 DCF because of limited bandwidth. Taking CBR traffic as example, we studied the traffic performance with different parameters in this paper. The results show that for an overloaded network, the traffic with longer packet size has greater throughput. Since the MAC layer performs the same competitive algorithm,...
For MAC (Media Access Control) protocol not providing QoS(Quality of Service) guarantees. With the increase of multimedia sevices in wireless networks(for example:voice, video, etc), when the networks get crowded, real-time applications will decrease its performance. We proposed a wireless network algorithm for 802.11e, witch supports fixed nodes and mobile nodes, and also swiches and new connections...
One of the major concerns in wireless sensor networks (WSNs) is improving the network lifetime. This paper addresses the problem of energy saving in an IEEE 802.15.4a large-scale full mesh WSNs based on UWB technology. It presents a network architecture to facilitate resource sharing and to ensure load and energy balancing. With a particular focus on medium access control (MAC) protocols, we propose...
The purpose of this study is to guarantee Quality of Service (QoS) in wireless multi-hop networks by introducing an admission control scheme. In wireless single-hop networks, IEEE 802.11e Enhanced Distributed Channel Access (EDCA) is the standard for QoS control. However, to control QoS, it is necessary to modify the currently used IEEE 802.11 Distributed Coordination Function (DCF)-compliant terminals...
IEEE 802.16j mobile multi-hop relay network is proposed to enhance the system coverage, user throughput and the capacity of fixed/mobile broadband wireless access system in IEEE 802.16d/802.16e. Relay station (RS) enables data transmission between base station and end user when the channel is not good for transmission. Besides, one relay station also communicates with a pair of other relay stations...
In this paper, we evaluate the capacity gains expected when introducing HSUPA+ capable devices in the network. We first develop a flow level capacity for a cell carrying legacy UMTS devices in addition to HSPA and HSPA+ ones. We show how to calculate the QoS for both real time and elastic traffic using queuing theory analysis. Our model is next applied to assess the user-perceived QoS, i.e. the blocking...
With widespread use of multimedia communication, quality of experience (QoE) progressively becomes an important factor in networking today. Besides, multimedia applications can be supported under various technologies, including wired and wireless networks. Among them, Universal Mobile Telecommunications System (UMTS) is one of the most popular technology thanks to its support on mobility. Improved...
Advanced wireless networking technologies are expected to assist a human life comfortably. In this scenario, high quality real-time communication is important. This paper proposes a novel User Datagram Protocol (UDP) with rate-based congestion control to achieve Quality of Service (QoS) in wireless Ad-Hoc network.
The evolution of the WCDMA air interface, namely High Speed Downlink Packet Access (HSDPA) allows UMTS networks to improve network capacity and increase the theoretical data rates up to or above 10 Mbps. However, in HSDPA networks and the shared downlink radio channel used in HSDPA stills suffers from the insufficient data rates and are considered a challenging environment for delay and loss-sensitive...
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