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Exploiting Repetitions and Interference Cancellation for the 6G-V2X Sidelink Autonomous Mode

Alessandro Bazzi, Vittorio Todisco, Antonella Molinaro, Antoine O. Berthet, Richard A. Stirling-Gallacher, Claudia Campolo

TL;DR

This paper proposes to leverage receivers equipped with successive interference cancellation (SIC) capabilities, to exploit packet repetitions, and demonstrates that the proposed solution significantly outperforms the legacy Mode 2 scheme, especially under high interference conditions.

Abstract

In recent years, the Third Generation Partnership Project (3GPP) has developed the new radio-vehicle-to-everything (NR-V2X) sidelink standard, to enable direct communication between connected and autonomous vehicles (CAVs). Users can autonomously select radio resources for their transmissions with the Mode 2 channel access scheme, which can also operate under out-of-coverage conditions. However, Mode 2 performance is hindered by interference and packet collisions arising from dynamic mobile environments and limitations in assessing radio resource availability. The 3GPP specifications allow transmitting multiple copies of the same packet to improve reliability, though at the cost of increased channel congestion. This paper proposes to leverage receivers equipped with successive interference cancellation (SIC) capabilities, to exploit packet repetitions. Specifically, once a packet is successfully decoded the interfering contribution carried by repetitions can be cancelled from future or past received signals, enabling the decoding of new packets. Extensive highway scenario simulations demonstrate that the proposed solution significantly outperforms the legacy Mode 2 scheme, especially under high interference conditions, achieving improvements exceeding 100% in some cases.

Exploiting Repetitions and Interference Cancellation for the 6G-V2X Sidelink Autonomous Mode

TL;DR

This paper proposes to leverage receivers equipped with successive interference cancellation (SIC) capabilities, to exploit packet repetitions, and demonstrates that the proposed solution significantly outperforms the legacy Mode 2 scheme, especially under high interference conditions.

Abstract

In recent years, the Third Generation Partnership Project (3GPP) has developed the new radio-vehicle-to-everything (NR-V2X) sidelink standard, to enable direct communication between connected and autonomous vehicles (CAVs). Users can autonomously select radio resources for their transmissions with the Mode 2 channel access scheme, which can also operate under out-of-coverage conditions. However, Mode 2 performance is hindered by interference and packet collisions arising from dynamic mobile environments and limitations in assessing radio resource availability. The 3GPP specifications allow transmitting multiple copies of the same packet to improve reliability, though at the cost of increased channel congestion. This paper proposes to leverage receivers equipped with successive interference cancellation (SIC) capabilities, to exploit packet repetitions. Specifically, once a packet is successfully decoded the interfering contribution carried by repetitions can be cancelled from future or past received signals, enabling the decoding of new packets. Extensive highway scenario simulations demonstrate that the proposed solution significantly outperforms the legacy Mode 2 scheme, especially under high interference conditions, achieving improvements exceeding 100% in some cases.
Paper Structure (23 sections, 11 equations, 13 figures, 2 tables, 1 algorithm)

This paper contains 23 sections, 11 equations, 13 figures, 2 tables, 1 algorithm.

Table of Contents

  1. Introduction
  2. Background
  3. NR-V2X Sidelink with Mode 2
  4. Related work and contribution
  5. RB-NOMA
  6. Receiver with successive interference cancellation
  7. Receiver with forward cancellation
  8. Receiver with backward cancellation
  9. A toy example
  10. Complexity, SCI modifications, and memory requirements
  11. Abstraction of the physical layer
  12. Performance evaluation
  13. Simulation settings
  14. Output metrics
  15. Benchmarking schemes
  16. ...and 8 more sections

Figures (13)

  • Figure 1: Example of signal structure and representation of indications to following resource reservations.
  • Figure 2: Block schemes of the compared receivers.
  • Figure 3: Example of joint FRC and BKC process. Packets (and relevant copies) transmitted by V$_1$, V$_2$, V$_3$ are reported in green, gray, and blue, respectively.
  • Figure 4: Exemplification of the sorted allocation, assuming four orthogonal resources (gray, black, red, white).
  • Figure 5: Median channel busy ratio vs. vehicle density.
  • ...and 8 more figures