Search results for "Carrier sense multiple access with collision avoidance"

showing 3 items of 3 documents

Enable concurrent transmissions with beamforming for broadband wireless access in CSMA/CA-based WLANs

2014

In CSMA/CA based wireless local networks, two stations are not allowed to transmit at the same time due to interference generated to each other, resulting in degraded throughput. Concurrent transmission, which enables simultaneous transmission of two or more stations under certain conditions, is able to overcome this problem, leading to enhanced channel utilization efficiency. Different from earlier work on this topic which focuses on omni-direction concurrent transmission, we introduce in this paper beamforming into a co-channel concurrent transmission scheme and investigate the benefits of concurrency with beamforming. The circumstances for concurrent transmission and frame scheduling are…

BeamformingWireless broadbandbusiness.industryComputer scienceComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSWirelessThroughputData_CODINGANDINFORMATIONTHEORYbusinessCarrier sense multiple access with collision avoidanceComputer networkCommunication channelScheduling (computing)2014 IEEE Globecom Workshops (GC Wkshps)
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Adaptive Collision Avoidance through Implicit Acknowledgments in WSNs

2008

The large number of nodes, typical of many sensor network deployments, and the well-known hidden terminal problem make collision avoidance an essential goal for the actual employment of WSN technology. Collision avoidance is traditionally dealt with at the MAC Layer and plenty of different solutions have been proposed, which however have encountered limited diffusion because of their incompatibility with commonly available devices.In this paper we propose an approach to collision avoidance which is designed to work over a standard MAC Layer, namely the IEEE 802.15.4 MAC, and is based on application-controlled delays of packet transmission times. The proposed scheme is simple, decentralized …

Hidden node problemComputer sciencebusiness.industryComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSSynchronizationTree (data structure)ScalabilityMultiple Access with Collision Avoidance for WirelessWireless Sensor NetworksbusinessWireless sensor networkCollision avoidanceCarrier sense multiple access with collision avoidanceComputer network2008 IEEE Asia-Pacific Services Computing Conference
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Revisit of RTS/CTS Exchange in High-Speed IEEE 802.11 Networks

2005

IEEE 802.11 medium access control (MAC), called distributed coordination function (DCF), provides two different access modes, namely, 2-way (basic access) and 4-way (RTS/CTS) handshaking. The 4-way handshaking has been introduced in order to combat the hidden terminal phenomenon. It has been also proved that such a mechanism can be beneficial even in the absence of hidden terminals, because of the collision time reduction. We analyze the effectiveness of the RTS/CTS access mode, in current 802.11b and 802.11a networks. Since the rates employed for control frame transmissions can be much lower than the rate employed for data frames, the assumption on the basis of the 4-way handshaking introd…

Hidden node problembusiness.industryComputer scienceReal-time computingFrame (networking)Wireless local area networks (WLAN)Distributed coordination functionThroughputbackoff algorithmHandshakingMedia access controlMultiple Access with Collision Avoidance for WirelessIEEE 802.11e-2005businessCarrier sense multiple access with collision avoidanceComputer networkSixth IEEE International Symposium on a World of Wireless Mobile and Multimedia Networks
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