A first investigation of congestion control for LTE-V2X mode 4

Mansouri, Adel; Martinez, Vincent; Härri, Jérôme
WONS 2019, 15th IEEE Wireless On-demand Network systems and Services Conference, 22-24 January 2019, Wengen, Switzerland

3GPP LTE-V2X is a recent new cellular technology allowing direct communications between vehicles and any other stations. Its Sidelink mode 4 allows the scheduler to be fully distributed and not requiring any support from cellular infrastructures, thus making this mode well fitted for V2X safetyrelated communications. Based on a Listen-before-Talk (LBT) strategy, the scheduler, however, remains subject to performance degradation under increased channel load, and thus requires congestion control mechanisms. In this work, we focus on the interactions between the strategies used by the LTE-V2X
Sidelink mode 4 for autonomous resource allocations - LBT and Semi-persistent scheduling (SPS) - and decentralized congestion control (DCC) mechanisms. Simulations under various scenarios showed counter-productive interactions leading to performance
degradations, and strategies to mitigate them are suggested.

Systèmes de Communication
Eurecom Ref:
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