Abstract
In the C-V2X sidelink Mode 4 communication, the sensing-based semi-persistent scheduling (SPS) implements a message collision avoidance algorithm to cope with the undesirable effects of wireless channel congestion. Still, the current standard mechanism produces a high number of packet collisions, which may hinder the high-reliability communications required in future C-V2X applications such as autonomous driving. In this paper, we show that by drastically reducing the uncertainties in the choice of the resource to use for SPS, we can significantly reduce the message collisions in the C-V2X sidelink Mode 4. Specifically, we propose the use of the “lookahead”, which contains the next starting resource location in the time-frequency plane. By exchanging the lookahead information piggybacked on the periodic safety message, vehicular user equipment (UEs) can eliminate most message collisions arising from the ignorance of other UEs’ internal decisions. Although the proposed scheme would require the inclusion of the lookahead in the control part of the packet, the benefit may outweigh the bandwidth cost, considering the stringent reliability requirement in future C-V2X applications.
Highlights
The automotive industry and the information technology (IT) industry are joining forces towards connected and autonomous vehicles that offer a multitude of benefits, such as driving safety, traffic flow efficiency, driver comfort, and new infotainment experiences for passengers
Considered a network-controlled resource management based on the vehicle position information. They exploited the concept of minimum reuse distance, at which the same resource can be used by a different transmitter without affecting those receivers that are in the awareness range
By drastically reducing the uncertainties in the choice of the resource to use for the string of messages, we showed that we can significantly reduce the message collisions in the cellular V2X (C-V2X) sidelink
Summary
The automotive industry and the information technology (IT) industry are joining forces towards connected and autonomous vehicles that offer a multitude of benefits, such as driving safety, traffic flow efficiency, driver comfort, and new infotainment experiences for passengers. Mode 4 does not require cellular coverage, and vehicular user equipment (UEs) autonomously select their radio resources using a distributed scheduling scheme with a message collision resolution mechanism. When we envision a high-reliability C-V2X communication for future applications such as remote driving and autonomous driving, we need a very tight resource coordination and control among vehicular UEs. In this paper, we show that by sharing the information regarding their resource reselection to neighboring UEs, each UEs can mutually lower the message collision probability. We limit ourselves to the study of the algorithmic aspect of the message collision resolution mechanism in the sensing-based SPS algorithm Other aspects such as the physical channel models and their impacts to the algorithm are deferred to a future work.
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