Reduction of blockage node and hidden terminal problem of CSMA/CA MAC protocol using directional antenna

In order to ensure the strong real-time information sharing of Aerial Ad hoc Network, a low-delay information sharing algorithm for multiple-radio-per-platform networking is proposed based on the directional transmission capability of phased-array antenna. The algorithm introduces virtual nodes and virtual links in the process of topology generation first. By extracting topology information and choosing link grouping, it can effectively reduce redundant transmission and transmission latency of information sharing. Then, it is verified through simulation that the algorithm can reduce the latency by up to 49.8% and eliminate transmission redundancy. In addition, a direction selection algorithm is proposed for the variation of antenna beam direction. Simulation results show that the algorithm can further reduce the latency of information sharing and ensure the real time of information sharing, thus further improving the network performance.

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“…Hidden terminal conflict 22 in directional transmission. If there is hidden terminal in the packet transmission, then conflict arises.…”

Section: Problem Formationmentioning

confidence: 99%

A low-delay information sharing algorithm for multiple-radio-per-platform networking

Lin

Peng

et al. 2021

International Journal of Distributed Sensor Networks

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“…When the hop length is 3 or more the packet collision is very high because of hidden terminal problem. However hidden terminal problem can be reduced through the proper use of RTS control message and performance is improved by reducing the blockage node [15]. As shown in figure 1, node 3 is hidden from node 1 and node I is in interference range of node 4.…”

Section: Scenario 1: Chain Topologymentioning

confidence: 99%

The impact of delayed ACK on TCP variants protocols in wireless network

Bisoy

Pattnaik

Das

et al. 2014

2014 International Conference on High Performance Computing and Applications (ICHPCA)

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TCP is a connection oriented and reliable protocol of transport layer. TCP receiver generates one acknowledgment denoted as ACK for each data packet that received to acknowledges the sender. If the data packet and ACK uses the same path, then there may be collision between them due to channel contention. Finally TCP throughput is reduced due to huge ACK packet generation. TCP performance is very poor due to wireless channel characteristics. Since the packet loss is always related to path length, choosing appropriate delayed window size is an important parameter in wireless network. This paper, analyzes the impact of delayed acknowledgment on TCP variants say Newreno and Vegas in multi hop wireless networks. However the issues of congestion and loss recovery techniques for these two mechanisms are different. In this paper we study how well the TCP variants react with delayed acknowledgement strategy in multi hop network with different topologies and various flow patterns with respect to throughput, average delay and number of retransmission. The simulation result shows that TCP-Vegas achieve higher throughput, fewer retransmissions and less delay than Newreno. The performance of TCP-Vegas with delayed ack gets best performance among TCP variants.

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“…However, carrier-sense multiple access (CSMA), which avoids simultaneous access by detecting multiple potential wireless accesses, has been proposed [ 10 ]. Nevertheless, in the case of the widespread deployment of WSNs, packet collisions may still occur because of the hidden terminal problem, wherein the carrier sense cannot detect the other transmitting terminal [ 11 ]. In addition, the latency required to avoid packet collisions causes a delay in information aggregation.…”

Section: Introductionmentioning

confidence: 99%

Three Level Recognition Based on the Average of the Phase Differences in Physical Wireless Parameter Conversion Sensor Networks and Its Effect to Localization with RSSI

Ito

Oda

Takyu

et al. 2023

Sensors

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In recent years, there have been increased demands for aggregating sensor information from several sensors owing to the spread of the Internet of Things (IoT). However, packet communication, which is a conventional multiple-access technology, is hindered by packet collisions owing to simultaneous access by sensors and waiting time to avoid packet collisions; this increases the aggregation time. The physical wireless parameter conversion sensor network (PhyC-SN) method, which transmits sensor information corresponding to the carrier wave frequency, facilitates the bulk collection of sensor information, thereby reducing the communication time and achieving a high aggregation success rate. However, when more than one sensor transmits the same frequency simultaneously, the estimation accuracy of the number of accessed sensors deteriorates significantly because of multipath fading. Thus, this study focuses on the phase fluctuation of the received signal caused by the frequency offset inherent to the sensor terminals. Consequently, a new feature for detecting collisions is proposed, which is a case in which two or more sensors transmit simultaneously. Furthermore, a method to identify the existence of 0, 1, 2, or more sensors is established. In addition, we demonstrate the effectiveness of PhyC-SNs in estimating the location of radio transmission sources by utilizing three patterns of 0, 1, and 2 or more transmitting sensors.

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Reduction of blockage node and hidden terminal problem of CSMA/CA MAC protocol using directional antenna

Cited by 7 publications

References 6 publications

A low-delay information sharing algorithm for multiple-radio-per-platform networking

A low-delay information sharing algorithm for multiple-radio-per-platform networking

The impact of delayed ACK on TCP variants protocols in wireless network

Three Level Recognition Based on the Average of the Phase Differences in Physical Wireless Parameter Conversion Sensor Networks and Its Effect to Localization with RSSI

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