Network Capacity Research Papers - Academia.edu (original) (raw)
The hardest problem facing sensor networking today is the design and implementation of complex routing structures and application semantics for collaborative in-network processing on motes. Researchers have not been able to develop... more
The hardest problem facing sensor networking today is the design and implementation of complex routing structures and application semantics for collaborative in-network processing on motes. Researchers have not been able to develop general purpose routing techniques ...
We present a model of energy consumption in IP networks. Using this model, we identify energy ldquohotspotsrdquo and estimate how energy consumption will grow with increasing network capacity. Todaypsilas Internet uses less than 1% of the... more
We present a model of energy consumption in IP networks. Using this model, we identify energy ldquohotspotsrdquo and estimate how energy consumption will grow with increasing network capacity. Todaypsilas Internet uses less than 1% of the available electricity supply. However, network energy consumption could grow substantially as access rates increase.
Measuring network path capacity is an important capability to many Internet applications. But despite over ten years of effort, the capacity measurement problem is far from being completely solved. This paper addresses the problem of... more
Measuring network path capacity is an important capability to many Internet applications. But despite over ten years of effort, the capacity measurement problem is far from being completely solved. This paper addresses the problem of measuring network paths of asymmetric capacity without requiring the remote node’s control or overwhelming the bottleneck link. We first show through analysis and measurement that the current packet-dispersion methods, due to the packet size limitations, can only measure up to a certain degree of capacity asymmetry. Second, we propose TRIO that removes the limitation by using round-trip times (RTTs). TRIO cleverly exploits two types of probes to obtain three minimum RTTs to compute both forward and reverse capacities, and another minimum RTT for measurement validation. We validate TRIO’s accuracy and versatility on a testbed and the Internet, and develop a system to measure path capacity from the server or user side.
The 802.11 MAC protocol is widely used in wireless mesh networks. However, with multi-hop transmissions prevalent in such networks, neither the current 802.11 DCF basic scheme nor the RTS/CTS scheme can achieve full utilization of network... more
The 802.11 MAC protocol is widely used in wireless mesh networks. However, with multi-hop transmissions prevalent in such networks, neither the current 802.11 DCF basic scheme nor the RTS/CTS scheme can achieve full utilization of network capacity for various reasons. First, the 802.11 MAC provides low spatial reuse (low parallelism of transmissions). Second, the collision avoidance mechanism in 802.11 becomes less effective for multi-hop scenarios. In this article, we review two types of 802.11-based MAC enhancements to improve the efficiency and effectiveness in wireless mesh networks. One class of schemes focus on tuning transmission power and carrier sense threshold. In static strategies, the interference model is introduced and a static optimal strategy is derived for the worst case scenarios. In dynamic strategies, transmission power and carrier sensing threshold are tuned adaptively to various network conditions and access patterns. Another class of schemes exploit the channe...
This paper is an introduction to survivability of WDM networks. All the main optical protection techniques proposed as far as now for the WDM layer are classified and reviewed. In particular, commonly adopted protection strategies for... more
This paper is an introduction to survivability of WDM networks. All the main optical protection techniques proposed as far as now for the WDM layer are classified and reviewed. In particular, commonly adopted protection strategies for ring and mesh networks are explained. Moreover, off-line planning of WDM networks able to support path protection is briefly introduced. Finally, an example of heuristic network-capacity optimization is presented, discussing results obtained by considering a case-study network.
Wireless mesh networks (WMNs) consist of mesh routers and mesh clients, where mesh routers have minimal mobility and form the backbone of WMNs. They provide network access for both mesh and conventional clients. The integration of WMNs... more
Wireless mesh networks (WMNs) consist of mesh routers and mesh clients, where mesh routers have minimal mobility and form the backbone of WMNs. They provide network access for both mesh and conventional clients. The integration of WMNs with other networks such as the Internet, cellular, IEEE 802.11, IEEE 802.15, IEEE 802.16, sensor networks, etc., can be accomplished through the gateway and bridging functions in the mesh routers. Mesh clients can be either stationary or mobile, and can form a client mesh network among themselves and with mesh routers. WMNs are anticipated to resolve the limitations and to significantly improve the performance of ad hoc networks, wireless local area networks (WLANs), wireless personal area networks (WPANs), and wireless metropolitan area networks (WMANs). They are undergoing rapid progress and inspiring numerous deployments. WMNs will deliver wireless services for a large variety of applications in personal, local, campus, and metropolitan areas. Despite recent advances in wireless mesh networking, many research challenges remain in all protocol layers. This paper presents a detailed study on recent advances and open research issues in WMNs. System architectures and applications of WMNs are described, followed by discussing the critical factors influencing protocol design. Theoretical network capacity and the state-of-the-art protocols for WMNs are explored with an objective to point out a number of open research issues. Finally, testbeds, industrial practice, and current standard activities related to WMNs are highlighted.
Mobile communication networks alone consume 0.5 percent of the global energy today. Rapidly growing demand for capacity will further increase the energy consumption. Thus, improving energy efficiency has recently gained great interest... more
Mobile communication networks alone consume 0.5 percent of the global energy today. Rapidly growing demand for capacity will further increase the energy consumption. Thus, improving energy efficiency has recently gained great interest within the research community not only for environmental awareness but also to lower the operational cost of network operators. Base station deployment strategy is one of the key challenges to be addressed for fulfilling the future capacity demand in an energy efficient manner. In this paper, we investigate the relationship between energy efficiency and densification with regard to network capacity requirement. To this end, we
refine the base station power consumption model such that the parameters are determined by the maximum transmit power and develop a simple analytical framework to derive the optimum transmit power that maximizes energy efficiency for a certain capacity target. Our framework takes into account interference, noise and backhaul power consumption. Numerical results show that deployment of smaller cells significantly reduces the base
station transmit power, and thus shifts the key elements of energy consumption to idling and backhauling power. Network densification can only be justified when capacity expansion is anticipated.
The present paper considers a WDM optical packet ring in which multiple wavelengths are operated in a synchronous manner. This architecture attempts to blend packet switching techniques with optical transparency in order to offer a... more
The present paper considers a WDM optical packet ring in which multiple wavelengths are operated in a synchronous manner. This architecture attempts to blend packet switching techniques with optical transparency in order to offer a flexible MAN architecture able to accommodate large amounts of traffic demands. This architecture also performs traffic ldquogroomingrdquo (aggregation between different flows) but does not necessitate Optical-Electrical-Optical conversion in transit nodes. In each time slot, a ...
- by Jan A van Deventer and +2
- •
- Engineering, Thermodynamics, Economics, Heat Transfer
This review of literature will navigate through proven model specifications that estimate delay as a function of investment in a logical airport network. Then, drawing from research in network and spatial science, I discern one way to... more
This review of literature will navigate through proven model specifications that estimate delay as a function of investment in a logical airport network. Then, drawing from research in network and spatial science, I discern one way to index network neighbors that captures the spatial interaction between airports. The following literature reveals how to restructure static geographic distributions of investment at airports for network spatial analysis, and ultimately shows what properties are requisite for network spatial autocorrelation to assess the efficacy of those investments.
Abstract: A design of an automatic network capacity markets, often referred to asa bandwidth market, is presented. Three topics are investigated. First, anetwork model is proposed. The proposed model is based upon a trisectionof the... more
Abstract: A design of an automatic network capacity markets, often referred to asa bandwidth market, is presented. Three topics are investigated. First, anetwork model is proposed. The proposed model is based upon a trisectionof the participant roles into network users, network owners, and market middlemen.The network capacity is defined in a way that allows it to be traded,and to have
The deployment of femtocells in a macrocell network is an economical and effective way to increase network capacity and coverage. Nevertheless, such deployment is challenging due to the presence of inter-tier and intra-tier interference,... more
The deployment of femtocells in a macrocell network is an economical and effective way to increase network capacity and coverage. Nevertheless, such deployment is challenging due to the presence of inter-tier and intra-tier interference, and the ad hoc operation of femtocells. Motivated by the flexible subchannel allocation capability of OFDMA, we investigate the effect of spectrum allocation in two-tier networks,
Many techniques have been proposed in the last few years to address performance degradations in end-to-end congestion control. Although these techniques require parameter tuning to operate in different congestion scenarios, they miss the... more
Many techniques have been proposed in the last few years to address performance degradations in end-to-end congestion control. Although these techniques require parameter tuning to operate in different congestion scenarios, they miss the challenging target of both minimizing network delay and keeping goodput close to the network capacity. In this paper we propose a new mechanism, called Active Window Management (AWM), which addresses these targets by stabilizing the queue length in the network gateways. AWM acts on the Advertised Window parameter in the TCP segment carrying the acknowledge, but it does not affect the TCP protocol. The proposed technique is implemented in the network access gateways, that is, in the gateways through which both the incoming and outgoing packets related to a given TCP connection are forced to go, whatever the routing strategy used in the network. We show that when the access gateways implementing AWM are the bottleneck in the networks, TCP performance is very close to that of a pseudo constant bit rate protocol providing no loss, while network utilization is close to one.