Location-Based TDMA MAC for Reliable Aeronautical Communications (original) (raw)
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We present the results of a measurement campaign conducted with a wireless sensor network (WSN) deployment inside an aircraft. A robust and scalable TDMA protocol for mission-critical applications was developed, which exploits spatial diversity provided by redundant access points. The WSN, consisting of 500 sensor nodes organized in three cells with two redundant access points per cell, was installed in an Airbus A330-300. The link quality and the packet error rate with and without the redundant access points was evaluated. It was found that the packet error rate could be decreased more than four times by using the spatial diversity introduced by the dual access point approach.
Throughput and delay analysis in Aeronautical Data Networks
2012 International Conference on Computing, Networking and Communications (ICNC), 2012
Evergrowing consumer demand for wireless connectivity is opening a new paradigm of communications, "Aeronautical Data Networks (ADN)". The desire is to provide high throughput and cost effective data network not only for an aeronautical applications, but also for terrestrial networks by using aeronautical platforms as a backbone. An aeronautical station (AS) could be a commercial plane, a helicopter, or any other low orbit station, i.e., Unmanned Air Vehicle, High Altitude Platforms. In this paper, we study an aeronautical broadband wireless access scheme to provide throughput and delay analysis for ADN. First, a simple topology of ADN is presented as a mobile ad-hoc network (MANET). A two-hop network model is considered where each packet makes two hops, one from the source AS to a relay AS and one from the relay AS to the destination AS. Then, based on the method of finding the maximum number of concurrent successful transmissions, the ADN throughput upper bound is obtained. Closed-form endto-end delay expression is also derived, to provide a general ADN system performance in terms of throughput and delay. Numerical results are presented, which show the alignment with our theoretical analysis.
2011
We propose a reliable multicast MAC protocol based on the multicarrier direct-sequence code-division multiple access (MC DS-CDMA) scheme to enhance spatial reuse efficiency in wireless local area networks (WLANs). Conventional multicast MAC protocols using RTS-CTS handshake exchange CTS and ACK packets consecutively for reliable transmission. Although this protocol guarantees transmission reliability by avoiding the hidden node (HN) problem, multiple CTSs and ACKs degrade network efficiency and cause the well-known exposed node (EN) problem, rather than the HN problem. The multicast sender must receive multiple CTSs and ACKs from all multicast receivers in its own multicast group for reliable multicast. The range of the EN problem is greater than that of the unicast, and spatial reuse efficiency decreases. In the proposed protocol, CTS/ACK messages of multiple receivers can be transmitted concurrently through the MC DS-CDMA mechanism to alleviate the EN problem and enhance spatial reuse efficiency. This can reduce the transmission and carrier sensing range of multiple receivers, since the protocol spreads the CTS/ACK transmission power by the spreading gain. The proposed protocol also reduces the total transmission delay due to the reduction of the overhead of consecutive CTSs and ACKs. The proposed protocol is thoroughly examined by simulation and theoretical methods. Results show that the proposed protocol significantly reduces the aforementioned overhead, and thus improves the performance of WLAN systems.
VeMAC: A TDMA-Based MAC Protocol for Reliable Broadcast in VANETs
IEEE Transactions on Mobile Computing, 2000
The need of a medium access control (MAC) protocol for an efficient broadcast service is of great importance to support the high priority safety applications in vehicular ad hoc networks (VANETs). This paper introduces VeMAC, a novel multichannel TDMA MAC protocol proposed specifically for a VANET scenario. The VeMAC supports efficient one-hop and multi-hop broadcast services on the control channel by using implicit acknowledgments and eliminating the hidden terminal problem. The protocol reduces transmission collisions due to node mobility on the control channel by assigning disjoint sets of time slots to vehicles moving in opposite directions and to road side units. Analysis and simulation results in highway and city scenarios are presented to evaluate the performance of VeMAC and compare it with ADHOC MAC, an existing TDMA MAC protocol for VANETs. It is shown that, due to its ability to decrease the rate of transmission collisions, the VeMAC protocol can provide significantly higher throughput on the control channel than ADHOC MAC.
Throughput analysis in Aeronautical Data Networks
WAMICON 2011 Conference Proceedings, 2011
The advances in signal processing, rapidprototyping and an insatiable consumer demand for wireless connectivity is opening a new paradigm of data service, "Aeronautical Data Networks (ADN)". The desire is to provide low delay and cost effective data network not only for an aeronautical platform, but also terrestrial networks by using aeronautical platforms as a backbone. An aeronautical station could be a commercial plane, a helicopter or any other very low orbit station i.e., Unmanned Air Vehicle (UAV), High Altitude Platform (HAP). In this paper, we investigate aeronautical broadband wireless access scheme to provide a ADN capacity analysis. First the geometry and connectivity of an ADN is investigated to present the parameters that effects the throughput of an ADN. Then the network throughput analysis based on finding the maximum number of concurrent successful transmissions method is done to provide an upper bound for the throughput of ADN. Simulation results are presented and it is shown that the analytically derived upper bound is tight under the condition that the aeronautical stations are independent and identically distributed (i.i.d.) over the ADN. Numerical results for various possible scenarios depending on ADN geometry are also presented.
A tightly synchronized TDMA MAC protocol for multi-hop WiFi-based long distance networks
2014 Sixth International Conference on Ubiquitous and Future Networks (ICUFN), 2014
In this paper, a centralized TDMA-based MAC protocol for multi-hop WiFi-based Long Distance network (WiLD) networks, called 2C, is presented which provides better endto-end throughput and delay. The possibility of collision which exists in 2P-based MAC protocols due to the loss of synchronization token has been reduced significantly employing tight time synchronization among the nodes. 2C enhances network performance by optimally utilizing the available bandwidth through overlapped scheduling of transmissions in different links. The proposed MAC protocol shows clear improvement over 2P in terms of saturation throughput as well as average end-to-end packet delay over multiple hops. NS-2 simulation results validate the claim of the paper.
IEEE Access
Time division multiple access (TDMA) based medium access control (MAC) schemes are widely used for communication among directional nodes since they can provide a conflict-free transmission schedule. However, the existing directional TDMA schemes introduce significant overhead and delay, and cannot adapt in real-time to topology changes in a directional multi-hop network. These schemes also incur considerable overhead and delay in order to support the QoS (quality of service) traffic. In this paper, a novel, real-time, distributed, directional TDMA scheme is presented for directional multi-hop wireless networks. This scheme adapts to the topology changes and/or flow requirements in real-time, and facilitates QoSaware communication with no notification overhead. In the proposed scheme, the 1-hop neighborhood of every node is divided into fully connected 1-hop neighborhoods, which allows the node to intelligently serve multiple routes without requiring a globally converged scheduling solution. This feature allows the use of a low-complexity rank-based mechanism to obtain a distributed, real-time transmission schedule for a directional multi-hop network. The following new features are also added in the proposed scheme: (i) REQ period which reduces slot wastage, (ii) throughput scaling which ensures fairness and helps in congestion management, and (iii) piggyback reservation period which increases the spatial reuse and adapts to the dynamic requirements of multiple flows in real-time. The control-period overhead in our scheme is low and linearly changes with the number of nodes in a fully connected 1-hop neighborhood, instead of the total number of nodes in the entire network. Simulation results and comparisons with other recent, distributed TDMA-based schemes show that our scheme provides a higher throughput with very low control overhead for both static and mobile network topologies. INDEX TERMS Directional communication, distributed medium access control (MAC), multi-hop network, mobile network, quality of service (QoS), time-division multiple access (TDMA).
Impact of Platoon Size on the Performance of TDMA-Based MAC Protocols
2018 IEEE Globecom Workshops (GC Wkshps), 2018
Vehicular networks are a core component in Intelligent Transportation Systems (ITS) enabling communication among vehicles for collaborative applications. One example of such an application that may bring benefits in reducing travel time, fuel consumption and improving safety is platooning. This application coordinates a group of vehicles that travel together, doing automatic control of inter-distances and speeds [1]. A critical part of this application is the vehicle-to-vehicle (V2V) communication highlighting the importance of improving the channel quality. Existing ITS standards, namely WAVE (USA) and ITS-G5 (Europe), use IEEE 802.11p DSRC (Dedicated Short-Range Communication) [2] that relies on CSMA/CA distributed access arbitration. Despite the Collision Avoidance attribute collisions can still occur and the channel quality can degrade significantly in dense traffic environments.