Abstract
The development of multibeam directional transmission technology used in vehicular ad hoc networks is drawing much more attention in recent years due to its wider coverage ability than omnidirectional transmission. In this paper, we analyse the transport capacity of the vehicular network using different antenna modes in the transmitter and receiver end, respectively. We first construct the cross-layer model comprising the characteristic of the directional antenna model, arbitrary network model, and interference model. Then, based on scaling laws, we calculate the upper and lower bound of the network capacity with and without the directional multibeam transmission technology. In order to reduce the capacity lower bound computation complexity, several topology frameworks are constructed while taking various interferences into account included in the actual project. Finally, we analyse the capacity under changes of different parameters and also evaluate the law of capacity changes to discover how much improvement multibeam transmission technology can bring to the network performance. Analysis shows that compared with DTOR and OTDR mode, DTDR mode can continue to increase network capacity by 2 to 3 times on the basis of the above two modes.
Highlights
Network capacity is one of the most important indicators to evaluate vehicular ad hoc network (VANET) communication performance
Since Gupta and Kumar [1] proposed the investigating method of network capacity in wireless ad hoc networks based on omnidirectional transmission, many researches have focused on this field
They proposed that the network capacity is ΘðWpffinffiffiÞ under the arbitrary network model, where n nodes are arbitrarily placed in a disk of unit area and the channel bandwidth is W
Summary
Network capacity is one of the most important indicators to evaluate vehicular ad hoc network (VANET) communication performance. Knuth notation is used to express this result, where f ðn Þ = Θ1⁄2gðnÞ means f ðnÞ and gðnÞ have the same growth level According to these researches, many calculations for the upper and lower bounds of wireless ad hoc network capacity and methods to improve network transmission capacity and throughput capacity have been proposed. This paper mainly studies the network capacity of the VANET and analyses how much improvement the network capacity can be brought to by the use of multibeam directional transmission technology compared with the traditional antenna working mode. We fully take the influence of the directional antenna side lobe effect on the network capacity into account and derive the upper and lower bound of the arbitrary network capacity when the transceiver node pairs use the following four working modes.
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