The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Dynamic allocation and release of lightpaths cause spectral fragmentation and degrade the bandwidth occupation in elastic optical networks (EON). Spectral reallocation and defragmentation strategies are key issues to minimize this problem and should be carefully chosen to simplify network management and to avoid excessive use of hardware. In this paper, we investigate the application of three different...
In order to estimate the DL cell average throughput of LTE network, the paper proposes an algorithm of LTE throughput based on MCS level distribution which can be used to estimate the DL cell capacity under different load conditions. The algorithm is convenient for operation and useful in guiding network planning and optimization, the simulation results show that the algorithm is effective and the...
Although fair bandwidth allocation (FBA) can be achieved in optical burst switching (OBS) networks, the actual transmission rate of the flow not only depends on the fairly allocated rate but also its burst loss probability, which tends to increase with larger hop counts due to the high-loss characteristic of OBS. The previous proposals provide FBA with distance fairness provisioning in various ways,...
In this paper, a new joint scheduling and hybrid resource allocation method is derived and investigated for a multi-user downlink Orthogonal Frequency Division Multiple Access (OFDMA) system that provides Time Delay-Sensitive services (TDS) and Time Delay-Insensitive services (TDI). A three sectored multi-cellular heterogeneous traffic environment is considered where users are randomly distributed...
Peer-to-Peer (P2P) live streaming traffic has been growing at a phenomenal rate over the past few years. When the original streaming content is mixed with bogus data, the corresponding P2P streaming network is being subjected to a “pollution attack.” As the content is shared by peers, the bogus data can be spread widely in minutes. In this paper, we study the impact of a pollution attack in popular...
As various wireless technologies and application demands for more and more bandwidth, dynamic channel allocation in multiple bands has become an attractive research direction. In this paper, we propose several channel allocation policies for various types of user profiles under various fluctuation traffic loads in dual-band multi-cell environments. The considered policies include 1) fixed allocation...
TCP is the main and most widely used transport protocol for reliable communication. Because of its widespread need, researchers have been studying and proposing new TCP variants trying to improve its behavior towards congestion to make it use the most available bandwidth while preserving a logical level of fairness towards other protocols. This paper aims at evaluating and comparing the performance...
High concentration of users in a cell of a wireless LAN leads to an unsustainable traffic load at the access point (AP). An unsuitable solution to the problem will cause poor connectivity for users, severe performance degradation, and possible collapse of the wireless LAN. In this paper, we present a scheduler based on queue length at the AP and a congestion control scheme based on the channel utilization...
Traffic grooming in wavelength division multiplexing networks merges low-speed flows into large capacity pipes so that the bandwidth discrepancy between them will not lead to underutilization of resources. Dynamic grooming deals with requests for wavelength allocation based on a dynamic pattern of arrivals in contrast to the situation of static grooming in which the pattern of arrivals must be previously...
In a wireless mesh network (WMN), mesh clients (MCs) access the Internet through the wireless backbone formed by the Internet Gateways (IGWs) and Mesh Routers (MRs). An IGW as the traffic center may easily become the congestion center in a WMN. The load balancing between IGWs will reduce the traffic congestion thereby improving the network performance and providing a better quality of service (QoS)...
RED is the only active queue management mechanism recommended by IETF. Though RED is successful in network congestion control and link utilization enhancement, it suffers from two problems, the stability and the fairness. The fairness problem means 1) RED has little affects on unresponsive flows in congestion control - the UDP flow for example; 2) responsive flows with different packet size or round...
The Tactical Ground Reporting (TIGR) system provides a unique multimedia patrol preparation and debriefing tool tailored to the needs of the patrol leader, and is used by all U.S. Army brigades in Iraq and Afghanistan. The distribution of data from geographically dispersed patrols requires network awareness and policy flexibility. The TIGR system utilizes an application overlay on to the tactical...
There are large number of experimental evidences that network traffic processes exhibit ubiquitous properties of self-similarity and long-range dependence (LRD), i.e., of correlations over a wide range of time scales. Modeling and performance analysis of self-similar traffic have become an investigating hot topic in computer network. However, most of the studies have been focused on the estimation...
As the Internet evolves, traffic management has become a high-priority problem. Without a network centric traffic management scheme, severe fairness problems can arise. For instance, unfairness occurs with TCP traffic in the presence of careless or subversive misbehaving flows, or even in the presence of other TCP flavors if we consider inter-protocol unfairness. In this paper we propose a new AQM...
We propose a programmable and scalable traffic management scheme. Programmable traffic management at high-speed routers is difficult because programmability and high-speed packet processing have involved a serious tradeoff. To attain both, the new scheme combines control programs at a control server and simple packet handling functions, such as sampling packet headers and discarding packets, at routers...
Traffic grooming in wavelength division multiplexing networks merges low-speed flows into large capacity pipes so that the bandwidth discrepancy between them will not lead to underutilization of resources. On-line solutions for dynamic grooming typically involve the construction of an auxiliary graph for deciding on the routing and wavelength assignment. An auxiliary graph can represent the network...
BitTorrent, one of the most popular peer-to-peer file sharing applications, accounts for a large proportion of the total Internet traffic. While its appearance benefits the content distributors and users, the traffic injected into the network backbone has become a great challenge for the ISPs. In this paper, we study traffic shaping in BitTorrent-like applications to improve traffic locality and enable...
In this paper we present a low-complexity traffic prioritization strategy for video transmission using the H.264 scalable video coding (SVC) standard over 802.11e wireless networks.The first part of this work focuses on assessing the perceptual impact of data loss in the various enhancement layers using a wide set of H.264/SVC encoded videos.The analysis shows that perceptual impairments are highly...
Light trails, a fairly recent optical networking architecture for LAN and MAN, and possibly WAN applications, can support both optical unicast and multicast. In this paper we consider routing both types of traffic in a survivable light trail network with multiple wavelengths. The algorithm supports multi-hop routing where traffic may use up to two light trails to reach its destination. An ILP is developed...
How to improve the whole processing capability, the availability and survivability of network by use of load balancing is studied in this paper. To solve the problem with dynamic traffic, a novel dynamic weight based traffic sharing (DW-TS) algorithm is proposed. In DW-TS, we introduce the idea of traffic engineering algorithm-minimum interference routing algorithm (MIRA) in generalized multi-protocol...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.