Results 1 - 10 of 448

OAR: An Opportunistic Auto-rate Media Access

by B. Sadeghi, V. Kanodia, A. Sabharwal, E. Knightly - ACM Mobicom , 2005
"... The IEEE 802.11 wireless media access standard supports multiple data rates at the physical layer. Moreover, various auto rate adaptation mechanisms at the medium access layer have been proposed to utilize this multi-rate capability by automatically adapting the transmission rate to best match the c ..."
Abstract - Cited by 40 (1 self) - Add to MetaCart
coherence times typically exceed multiple packet transmission times for both mobile and nonmobile users, OAR achieves significant throughput gains as compared to state-of-the-art auto-rate adaptation mechanisms. Moreover, over longer time scales, OAR ensures that all nodes are granted channel access

Opportunistic Media Access for Multirate Ad Hoc Networks

by B. Sadeghi, V. Kanodia, A. Sabharwal, E. Knightly , 2002
"... The IEEE 802.11 wireless media access standard supports multiple data rates at the physical layer. Moreover, various auto rate adaptation mechanisms at the medium access layer have been proposed to utilize this multi-rate capability by automatically adapting the transmission rate to best match the c ..."
Abstract - Cited by 332 (12 self) - Add to MetaCart
coherence times typically exceed multiple packet transmission times for both mobile and nonmobile users, OAR achieves significant throughput gains as compared to state-of-the-art auto-rate adaptation mechanisms. Moreover, over longer time scales, OAR ensures that all nodes are granted channel access

ABSTRACT Opportunistic Media Access for Multirate

by B. Sadeghi, V. Kanodia, A. Sabharwal, E. Knightly
"... The IEEE 802.11 wireless media access standard supports multiple data rates at the physical layer. Moreover, various auto rate adaptation mechanisms at the medium access layer have been proposed to utilize this multi-rate capability by automatically adapting the transmission rate to best match the c ..."
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coherence times typically exceed multiple packet transmission times for both mobile and nonmobile users, OAR achieves significant throughput gains as compared to state-of-the-art auto-rate adaptation mechanisms. Moreover, over longer time scales, OAR ensures that all nodes are granted channel access

A Rate-Adaptive MAC Protocol for Multi-Hop Wireless Networks

by Gavin Holland, Nitin H. Vaidya, Paramvir Bahl , 2001
"... Wireless local area networks (W-LANs) have become increasingly popular due to the recent availability of affordable devices that are capable of communicating at high data rates. These high rates are possible, in part, through new modulation schemes that are optimized for the channel conditions bring ..."
Abstract - Cited by 484 (5 self) - Add to MetaCart
relatively few proposals for W-LANs. In this paper we present a rate adaptive MAC protocol called the Receiver-Based AutoRate (RBAR) protocol. The novelty of RBAR is that its rate adaptation mechanism is in the receiver instead of in the sender. This is in contrast to existing schemes in devices like

Variant design for mechanical artifacts: A state-of-the-art survey

by J. E. Fowler - ENGINEERING WITH COMPUTERS, 12: 1-15 , 1996
"... Variant design refers to the technique of adapting existing design specifications to satisfy new design goals and constraints. Specific support of variant design techniques in current computer aided design systems would help to realize a rapid response manufacturing environment. A survey of approach ..."
Abstract - Cited by 14 (0 self) - Add to MetaCart
Variant design refers to the technique of adapting existing design specifications to satisfy new design goals and constraints. Specific support of variant design techniques in current computer aided design systems would help to realize a rapid response manufacturing environment. A survey

Optimal Multi-Step k-Nearest Neighbor Search

by Thomas Seidl, Hans-Peter Kriegel , 1998
"... For an increasing number of modern database applica-tions, efficient support of similarity search becomes an important task. Along with the complexity of the objects such as images, molecules and mechanical parts, also the complexity of the similarity models increases more and more. Whereas algorith ..."
Abstract - Cited by 205 (23 self) - Add to MetaCart
, and our in-vestigations substantiate that the number of candidates which are produced in the filter step and exactly evalu-ated in the refinement step is a fundamental efficiency parameter. After revealing the strong performance shortcomings of the state-of-the-art algorithm for k-nearest neighbor search

MOAR: A Multi-channel Opportunistic Auto-rate Media Access Protocol for Ad Hoc Networks

by V. Kanodia, A. Sabharwal, E. Knightly
"... The IEEE 802.11 wireless media standard supports multiple frequency channels as well as multiple data rates at the physical (PHY) layer. Moreover, various auto rate adaptation mechanisms at the medium access layer have been proposed to exploit the multi-rate capabilities of IEEE 802.11. In this pape ..."
Abstract - Cited by 39 (1 self) - Add to MetaCart
The IEEE 802.11 wireless media standard supports multiple frequency channels as well as multiple data rates at the physical (PHY) layer. Moreover, various auto rate adaptation mechanisms at the medium access layer have been proposed to exploit the multi-rate capabilities of IEEE 802

IEEE 802.11 Rate Adaptation: A Practical Approach

by Mathieu Lacage, Mohammad Hossein Manshaei, Thierry Turletti
"... Today, three di#erent physical (PHY) layers for the IEEE 802.11 WLAN are available (802.11a/b/g); they all provide multi-rate capabilities. To achieve high performance under varying conditions, these devices need to adapt their transmission rate dynamically. While this rate adaptation algorithm is a ..."
Abstract - Cited by 146 (2 self) - Add to MetaCart
is a critical component of their performance, only very few algorithms such as Auto Rate Fallback (ARF) or Receiver Based Auto Rate (RBAR) have been published and the implementation challenges associated with these mechanisms have never been publicly discussed. In this paper, we first present

ERBAR: an Enhanced Receiver-Based Auto-Rate MAC Protocol for Wireless Ad Hoc Networks

by Zhifei Li, Anil K. Gupta, Sukumar Nandi, Sukumar N
"... The multi-rate capability provided by the physical layer in IEEE 802.11 requires that the MAC layer adapts the transmission rate according to the channel conditions. In a multihop wireless ad hoc network, where the RTS/CTS is always used to combat with the common hidden-terminal problem, the receive ..."
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, the receiver-based auto-rate (RBAR) [3] is more desirable compared to other rate adaptation algorithms. In this paper, we have introduced an enhanced receiver-based auto-rate (ERBAR) protocol, which improves the RBAR in two ways. First, a modified virtual carrier sensing (MVCS) mechanism is proposed, which

ARSM: Auto Rate Selection Multicast Mechanism for Multi-Rate Wireless LANs

by José Villalón, Yongho Seok, Thierry Turletti, Pedro Cuenca, Luis Orozco-barbosa - in "I11th IFIP International Conference on Personal Wireless Communications (PWC’06 , 2006
"... Abstract. Multicast is an efficient paradigm for transmitting data from a sender to a group of receivers. The IEEE 802.11 wireless LANs standards specify how to send multicast frames with no ACK and using one of the Basic Service Set (BSS) rates. This situation has led many researchers to design tec ..."
Abstract - Cited by 1 (0 self) - Add to MetaCart
sent by the multicast group members. However, the LBP mechanism falls short by not considering the varying conditions characterizing the wireless channels. In this paper, we introduce a novel auto rate selection multicast mechanism for multi-rate wireless LANs, namely ARSM (Auto Rate Selection
Results 1 - 10 of 448