description Design, analysis and implementation of wireless protocols and algorithms. One of the main challenge in wireless ad hoc networks is Medium Access Control. The IEEE 802.11 standard provides a communication mode called DCF (Distributed Coordination Function) that is fully distributed and suitable for ad hoc networks. However, the MAC (Medium Access Control) protocol described in 802.11...

The most popular strategies for dealing with packet collisions at the Medium Access Control (MAC) layer in distributed wireless networks use a combination of carrier sensing and collision avoidance. When the collision avoidance strategy fails such schemes cannot detect collisions, and corrupted data frames are still transmitted in their entirety, thereby wasting the channel bandwidth and signif...

Recently, cognitive radio (CR) technology is broadly applied even to sensor networks. Cognitive radio sensor networks (CRSNs) have been studied and, apparently, sensor nodes equipped with directional antennas achieve higher energy efficiency. This paper proposes a medium access control (MAC) protocol named directional CR-aware MAC (DC-MAC) for CRSNs. To the best of the authors’ knowledge, this ...

Bandwidth, power and collision are considered as three important resources in wireless networks. Therefore, how to manage these resources becomes a effect on wireless ad hoc network. These effects are not present in wire line networks, and evaluation of available bandwidth in wireless networks a difficult task. Furthermore, in wireless medium the available resources also vary with the protocol ...

In this paper, the necessity to achieve a capable Medium Access Control protocol subject to bandwidth constraints is considered. As Medium Access Control has an important role on the bandwidth allotment, bandwidth efficiency is one of the main concept in the design of Medium Access Control (MAC) protocols for MANETs. Nodes are placed in an ad hoc manner, when transmitting the packets nodes will...

Mobile ad hoc networks (MANETs) are useful in environment where fixed network infrastructure is unavailable. To function normally, MANETs demand an efficient and distributed medium access control (MAC) protocol. However, characteristics of MANETs such as radio link vulnerability, mobility, limited power pose great challenges on MAC design. This paper surveys the recent advances in MAC design fo...

The demand for higher data rate has spurred the adoption of multiple-input multiple-output (MIMO) transmission techniques in IEEE 802.11 products. MIMO techniques provide an additional spatial dimension that can significantly increase the channel capacity. A number of multiuser MIMO system have been proposed, where the multiple antenna at the physical layer are employed for multiuser access, al...

In this paper we present experimental results evaluating the performance and fairness of FAST TCP in a series of tests involving realistic low rate network access scenarios. Links both using the DOCSIS cable modem medium access control (MAC) cable modem and simple low rate links were investigated. We seek to compare our expectations from theory with the behavior of an actual access network impl...

In this paper, we investigate the feasibility of providing two-way broadband access for residential interactive multimedia services over multi-beam satellite systems. We propose air-interface protocols and terminal structures for broadband access with special emphasis on the MAC (Medium Access Control) sub-layer. We have used SDLbased formal techniques to describe and validate the behavior of t...

We describe a new synchronous and distributed medium access control (MAC) protocol for multihop wireless networks that provides bandwidth guarantees to unicast connections. Our MAC protocol is based on a slotted time division multiple access (TDMA) architecture, with a multi-mini-slotted signaling phase scheduling data transmissions over slots in the following data phase. Resolving contentions ...