NR-V2X Mode 2 in ns-3 In 5G NR-V2X, vehicles communicate directly using sidelink. Two modes exist: Mode 1: gNB schedules sidelink resources. Mode 2: UEs autonomously select sidelink resources (no gNB needed). Mode 2 is especially important for vehicular networks (IoV), where cars must exchange safety messages without relying on infrastructure. In ns-3, the NrHelper class is used to: Create UE devices with sidelink PHY/MAC layers. Attach them to Bandwidth Parts (BWPs) and spectrum channels. Configure sidelink attributes such as: SidelinkMode = 2 (autonomous) SidelinkPeriod (resource pool periodicity) SidelinkSubchannelSize (RB grouping)
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