Journal ArticleDOI
Dynamic tuning of the IEEE 802.11 protocol to achieve a theoretical throughput limit
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TLDR
A distributed algorithm is proposed that enables each station to tune its backoff algorithm at run-time and indicates that the capacity of the enhanced protocol is very close to the theoretical upper bound in all the configurations analyzed.Abstract:
In wireless LANs (WLANs), the medium access control (MAC) protocol is the main element that determines the efficiency in sharing the limited communication bandwidth of the wireless channel. In this paper we focus on the efficiency of the IEEE 802.11 standard for WLANs. Specifically, we analytically derive the average size of the contention window that maximizes the throughput, hereafter theoretical throughput limit, and we show that: 1) depending on the network configuration, the standard can operate very far from the theoretical throughput limit; and 2) an appropriate tuning of the backoff algorithm can drive the IEEE 802.11 protocol close to the theoretical throughput limit. Hence we propose a distributed algorithm that enables each station to tune its backoff algorithm at run-time. The performances of the IEEE 802.11 protocol, enhanced with our algorithm, are extensively investigated by simulation. Specifically, we investigate the sensitiveness of our algorithm to some network configuration parameters (number of active stations, presence of hidden terminals). Our results indicate that the capacity of the enhanced protocol is very close to the theoretical upper bound in all the configurations analyzed.read more
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Book ChapterDOI
Reservation and grouping stations for the IEEE 802.11 DCF
TL;DR: A novel contention-based protocol, called Reservation with Grouping Stations (RGS) for the IEEE 802.11 Distributed Coordination Function (DCF), where stations are grouping into the active group, the ready group, and the idle group.
Proceedings ArticleDOI
Scalable multiple channel scheduling with optimal utility for wireless local area networks
TL;DR: Three scheduling algorithms are proposed for multiple channels in a wireless local area network environment where the resource unit assumes to be fixed length slot, and the CSSA achieves the highest scheduling efficiency, but with relatively high scheduling complexity.
Journal ArticleDOI
Energy Efficient Distributed Reservation Multiple Access with Adaptive Switching Requests for Wireless Networks
TL;DR: Simulation results show that DRMA-ASR provides better performance in terms of channel throughput, end to end delay, and energy efficiency than CSMA/CA with both small and large interference ranges.
Proceedings ArticleDOI
A collision-aware backoff mechanism for IEEE 802.11 WLANs
TL;DR: A novel backoff algorithm, collision-aware backoff mechanism (CABM), which can dynamically select a suitable contention window size according to the contention level of current network is proposed.
References
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Journal ArticleDOI
Packet Switching in Radio Channels: Part I--Carrier Sense Multiple-Access Modes and Their Throughput-Delay Characteristics
TL;DR: Two protocols are described for CSMA and their throughput-delay characteristics are given and results show the large advantage CSMA provides as compared to the random ALOHA access modes.
Journal ArticleDOI
Packet Switching in Radio Channels: Part II--The Hidden Terminal Problem in Carrier Sense Multiple-Access and the Busy-Tone Solution
TL;DR: The busy-tone multiple-access mode is introduced and analyzed as a natural extension of CSMA to eliminate the hidden-terminal problem and results show that BTMA with hidden terminals performs almost as well as CSMA without hidden terminals.
Book
TCP/IP Illustrated Vol 1 The Protocols
TL;DR: TCP/IP Illustrated, Volume 1 is a complete and detailed guide to the entire TCP/IP protocol suite - with an important difference from other books on the subject: rather than just describing what the RFCs say the protocol suite should do, this unique book uses a popular diagnostic tool so you may actually watch the protocols in action.
Journal ArticleDOI
IEEE 802.11 Wireless Local Area Networks
TL;DR: The performance investigation reveals that an IEEE 802.11 network may be able to carry traffic with time-bounded requirements using the point coordination function, however, the findings suggest that packetized voice traffic must be handled in conjunction with an echo canceler.
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Stochastic models in operations research
TL;DR: This course provides an introduction to the modeling and analysis of various random phenomena occurring in operations research and businesses such as inventory theory, queueing theory, genetics, demography, epidemiology, competing populations.