Results 11 - 20 of 449

A Framework for Frameless TDMA Using Slot Chains

by Gentian Jakllari, Mike Neufeld, Ram Ramanathan
"... Abstract—TDMA MAC protocols suffer from two drawbacks that have reduced its practical appeal, especially for infrastructure-less wireless networks: the need for time synchronization, and the use of frames. While there has been extensive research towards achieving the required time synchronization, t ..."
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, the frames are assumed to be inherent in TDMA. In this paper we present a framework for frameless TDMA based on a new concept we refer to as a slot chain. A slot chain is a series of slots with a starting slot and inter-slot period that is chosen to match a given capacity request. The key challenge in using

A flexible slotting scheme for tdma-based protocols

by Jens Chr Lisner - In ARCS 2004 Workshop on Dependability and Fault Tolerance , 2004
"... Abstract: Popular fault-tolerant1 TDMA-based protocols like TT-CAN ([Fu00] and [Mu02]), TTP ([KG93]) and FlexRay ([Fl02]) are using a static slotting scheme for bus arbitration. This paper describes a possible solution for a more exible handling of the slotting, by providing extra time of variable l ..."
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Abstract: Popular fault-tolerant1 TDMA-based protocols like TT-CAN ([Fu00] and [Mu02]), TTP ([KG93]) and FlexRay ([Fl02]) are using a static slotting scheme for bus arbitration. This paper describes a possible solution for a more exible handling of the slotting, by providing extra time of variable

Slot Allocation In A Tdma Satellite System: Simulated . . .

by T. Toker, E. Altman, J. Galtier, C. Touati, I. Buret, B. Fabre, C. Guiraud , 2003
"... ... this paper the uplink slot assignment problem in a multi-spot geostationary satellite. Radio interference impose constraints on the slots that can simultaneously be assigned in di#erent cells that have the same frequency. The problem is shown to be an NP-complete one, which motivates us to searc ..."
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... this paper the uplink slot assignment problem in a multi-spot geostationary satellite. Radio interference impose constraints on the slots that can simultaneously be assigned in di#erent cells that have the same frequency. The problem is shown to be an NP-complete one, which motivates us

Self-stabilizing deterministic TDMA for sensor networks

by Mahesh Arumugam, Sandeep S. Kulkarni - PROCEEDINGS OF THE SECOND INTERNATIONAL CONFERENCE ON DISTRIBUTED COMPUTING AND INTERNET TECHNOLOGY (ICDCIT), LNCS 3816 , 2005
"... An algorithm for time division multiple access (TDMA) is found to be applicable in converting existing distributed algorithms into a model that is consistent with sensor networks. Such a TDMA service needs to be self-stabilizing so that in the event of corruption of assigned slots and clock drift, ..."
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An algorithm for time division multiple access (TDMA) is found to be applicable in converting existing distributed algorithms into a model that is consistent with sensor networks. Such a TDMA service needs to be self-stabilizing so that in the event of corruption of assigned slots and clock drift

Towards Optimal TDMA Frame Size in Wireless Sensor Networks

by Kevin L. Bryan, Tiegeng Ren, Timothy Henry, Victor Fay-wolfe
"... Abstract—This paper describes a set of TDMA MAC protocols for wireless sensor networks that can achieve near-optimal throughput and good latency for regular periodic data delivery. The protocol is based on a novel graph coloring technique called the Color Constraint Heuristic (CCH) The paper describ ..."
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describes a centralized TDMA slot assignment algorithm, Centralized Slot Assignment (CSA-CCH), that uses CCH. It then describes a

TDMA Cluster-based MAC for VANETs (TC-MAC)

by Mohammad S. Almalag, Stephan Olariu, Michele C. Weigle
"... Abstract—One of the challenges for Vehicular Ad-hoc Networks (VANETs) is the design of the Medium Access Control (MAC) protocol. When exchanging messages between vehicles, there are network issues that must be addressed, including the hidden terminal problem, high density, high node mobility, and da ..."
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, and data rate limitations. A cluster-based MAC scheme is needed in VANETs to overcome the lack of specialized hardware for infrastructure and the mobility to support network stability and channel utilization. This paper presents a MAC algorithm for vehicular ad-hoc networks using a new method for TDMA slot

L-DRAND: A Localized Distributed TDMA Scheduling Algorithm with Distance-Measurement for Sensor Networks

by Koji Sato, Shiro Sakata
"... Abstract—This paper proposes a distributed TDMA slot scheduling algorithm which the slot allocation priority is controlled by distance measurement information. In the proposed scheme, named L-DRAND, Lamport's bakery algorithm for mutual exclusion is applied for prioritized slot allocation based ..."
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Abstract—This paper proposes a distributed TDMA slot scheduling algorithm which the slot allocation priority is controlled by distance measurement information. In the proposed scheme, named L-DRAND, Lamport's bakery algorithm for mutual exclusion is applied for prioritized slot allocation

Tdma time slot and turn optimization with evolutionary search techniques

by Arne Hamann, Rolf Ernst - In Proceedings of the 8th Design, Automation and Test in Europe (DATE , 2005
"... In this paper we present arithmetic real-coded variation operators tailored for time slot and turn optimization on TDMA-scheduled resources with evolutionary algorithms. Our operators implement a heuristic strategy to converge towards the solution space and are able to escape local minima. Furthermo ..."
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In this paper we present arithmetic real-coded variation operators tailored for time slot and turn optimization on TDMA-scheduled resources with evolutionary algorithms. Our operators implement a heuristic strategy to converge towards the solution space and are able to escape local minima

CLOCK DRIFT REDUCTION FOR RELATIVE TIME SLOT TDMA-BASED SENSOR NETWORKS

by R. Tjoa, K. L. Chee, P. K. Sivaprasad, S. V. Rao, J. G. Lim
"... In an ad hoc sensor network clock synchronization is a serious issue as nodes in the sensor network have different clock drifts. One of the common solutions for the time synchronization among these nodes is the active transmission of time stamp messages. However this method consumes some resources a ..."
Abstract - Cited by 8 (0 self) - Add to MetaCart
and channel bandwidth, and is not suitable for resource constrained nodes in the sensor network. This paper presents a novel method with minimum overhead that reduces clock drift effects in the synchronization of nodes in sensor networks using relative time-slot referencing TDMA based MAC protocol.

TITLE: TDMA System Synchronization Using Timebase Marker Messages

by Victor T. Hou, Barry Dorr, Michael Gittings, Robert Mullins, Bernardo Paratore, Gregory S. Smith , 1996
"... ABSTRACT: The purpose of this contribution is to define an upstream synchronization technique using Timebase Markers to synchronize upstream TDMA transmission. This method involves sending Timebase Marker messages in the downstream channels to Subscriber Client Units (SCUs) in order to synchronize t ..."
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the transmission of bursts in upstream TDMA slot times. This synchronization method is different from one in which the TDMA timebase is derived from the downstream framing. This method has the advantages of being independent from the downstream modulation scheme, downstream symbol rate, and the downstream framing
Results 11 - 20 of 449