Results 1 - 10 of 2,126

Location Awareness in Community Wireless LANs

by Alois Ferscha, Wolfgang Beer, Wolfgang Narzt , 2001
"... The growing availability of wireless LAN technologies together with the pervasive use of mobile and embedded computing devices gives strong raise for internet services adapted to context, particularly the location of their use. In multi-user cooperation environments for closed area communities like ..."
Abstract - Cited by 3 (0 self) - Add to MetaCart
The growing availability of wireless LAN technologies together with the pervasive use of mobile and embedded computing devices gives strong raise for internet services adapted to context, particularly the location of their use. In multi-user cooperation environments for closed area communities like

RADAR: an in-building RF-based user location and tracking system

by Paramvir Bahl, Venkata N. Padmanabhan , 2000
"... The proliferation of mobile computing devices and local-area wireless networks has fostered a growing interest in location-aware systems and services. In this paper we present RADAR, a radio-frequency (RF) based system for locating and tracking users inside buildings. RADAR operates by recording and ..."
Abstract - Cited by 2036 (14 self) - Add to MetaCart
The proliferation of mobile computing devices and local-area wireless networks has fostered a growing interest in location-aware systems and services. In this paper we present RADAR, a radio-frequency (RF) based system for locating and tracking users inside buildings. RADAR operates by recording

Routing Techniques in Wireless Sensor Networks: A Survey

by Jamal N. Al-karaki, Ahmed E. Kamal - IEEE WIRELESS COMMUNICATIONS , 2004
"... Wireless Sensor Networks (WSNs) consist of small nodes with sensing, computation, and wireless communications capabilities. Many routing, power management, and data dissemination protocols have been specifically designed for WSNs where energy awareness is an essential design issue. The focus, howeve ..."
Abstract - Cited by 741 (2 self) - Add to MetaCart
Wireless Sensor Networks (WSNs) consist of small nodes with sensing, computation, and wireless communications capabilities. Many routing, power management, and data dissemination protocols have been specifically designed for WSNs where energy awareness is an essential design issue. The focus

A comparison of mechanisms for improving TCP performance over wireless links

by Hari Balakrishnan, Venkata N. Padmanabhan, Srinivasan Seshan, Randy H. Katz - IEEE/ACM TRANSACTIONS ON NETWORKING , 1997
"... Reliable transport protocols such as TCP are tuned to perform well in traditional networks where packet losses occur mostly because of congestion. However, networks with wireless and other lossy links also suffer from significant losses due to bit errors and handoffs. TCP responds to all losses by i ..."
Abstract - Cited by 927 (11 self) - Add to MetaCart
Reliable transport protocols such as TCP are tuned to perform well in traditional networks where packet losses occur mostly because of congestion. However, networks with wireless and other lossy links also suffer from significant losses due to bit errors and handoffs. TCP responds to all losses

Next Century Challenges: Mobile Networking for “Smart Dust”

by J. M. Kahn, R. H. Katz , K. S. J. Pister , 1999
"... Large-scale networks of wireless sensors are becoming an active topic of research. Advances in hardware technology and engineering design have led to dramatic reductions in size, power consumption and cost for digital circuitry, wire-less communications and Micro ElectroMechanical Systems (MEMS). Th ..."
Abstract - Cited by 625 (1 self) - Add to MetaCart
the key elements of the emergent technology of “Smart Dust ” and outline the research challenges they present to the mobile networking and systems community, which must provide coherent connectivity to large numbers of mobile network nodes co-located within a small volume.

Power-Aware Localized Routing in Wireless Networks

by Ivan Stojmenovic, Xu Lin , 2000
"... Recently, a cost aware metric for wireless networks based on remaining battery power at nodes was proposed for shortest-cost routing algorithms, assuming constant transmission power. Power aware metrics where transmission power depends on distance between nodes, and corresponding shortest-power algo ..."
Abstract - Cited by 298 (33 self) - Add to MetaCart
Recently, a cost aware metric for wireless networks based on remaining battery power at nodes was proposed for shortest-cost routing algorithms, assuming constant transmission power. Power aware metrics where transmission power depends on distance between nodes, and corresponding shortest

On Indoor Position Location With Wireless Lans

by Prasithsangaree Krishnamurthy Chrysanthis, P. Prasithsangaree, P. Krishnamurthy, P. K. Chrysanthis - 13th IEEE International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC 2002 , 2001
"... Location aware services are becoming attractive with the deployment of next generation wireless networks and broadband multimedia wireless networks especially in indoor and campus areas. To provide location aware services, obtaining the position of a user accurately is important. While it is possibl ..."
Abstract - Cited by 78 (2 self) - Add to MetaCart
Location aware services are becoming attractive with the deployment of next generation wireless networks and broadband multimedia wireless networks especially in indoor and campus areas. To provide location aware services, obtaining the position of a user accurately is important. While

Robotics-Based Location Sensing Using Wireless Ethernet

by Andrew M. Ladd, Kostas E. Bekris, Algis Rudys, Lydia E. Kavraki, Dan S. Wallach - Wireless Networks , 2005
"... A key subproblem in the construction of location-aware systems is the determination of the position of a mobile device. This article describes the design, implementation and analysis of a system for determining position inside a building from measured RF signal strengths of packets on an IEEE 802.11 ..."
Abstract - Cited by 241 (5 self) - Add to MetaCart
.11b wireless Ethernet network. Previous approaches to location-awareness with RF signals have been severely hampered by non-Gaussian signals, noise, and complex correlations due to multi-path effects, interference and absorption. The design of our system begins with the observation that determining

A Two-Tier Data Dissemination Model for Large-scale Wireless Sensor Networks

by Fan Ye, Haiyun Luo, Jerry Cheng, Songwu Lu, Lixia Zhang , 2002
"... networking. It suggests that information about each mobile sink's location be continuously propagated through the sensor field to keep all sensor nodes updated with the direction of forwarding future data reports. Unfortunately frequent location updates from multiple sinks can lead to both exce ..."
Abstract - Cited by 288 (14 self) - Add to MetaCart
grid structure which enables mobile sinks to continuously receive data on the move by flooding queries within a local cell only. TTDD's design exploits the fact that sensor nodes are stationary and location-aware to construct and maintain the grid structures with low overhead. We have evaluated

Experiences of developing and deploying a context-aware tourist guide: the GUIDE project

by Keith Cheverst, Nigel Davies, Keith Mitchell, Adrian Friday , 2000
"... The GUIDE system has been developed to provide city visitors with a hand-held context-aware tourist guide. The system has been successfully deployed in a major tourist destination and is currently at the stage where it is publicly available to visitors who wish to explore the city. Reaching this sta ..."
Abstract - Cited by 228 (8 self) - Add to MetaCart
the entire system during an extensive field-trial study. This paper reports on our results in each of these areas. We believe that through our work on the GUIDE project we have produced a blueprint for the development of interactive context-aware systems that should be of real value to those in the community
Results 1 - 10 of 2,126