Vehicle-to-vehicle (V2V) communication is a critical 5 G scenario demanding stringent safety requirements. As a way of ensuring safe packet exchange between vehicles in a V2V system, we propose a new cooperative transmission scheme employing a signal superposition technique from non-orthogonal multiple access (NOMA), which we call cooperative superposed transmission (CST). In the proposed CST, vehicle user equipments (VUEs) superpose other VUEs' signals that they have received on to their own transmission signals. This allows them to retransmit other users' V2V packets during their packet transmission. The result is high communication reliability because packets can be sent multiple times without intensifying inter-user interference (IUI). We perform a theoretical analysis, then use it to derive a closed-form expression for the link reliability of the proposed CST. Based on this, a new power control and user pairing algorithm is designed to maximize reliability. Simulation results show that the proposed scheme achieves higher reliability and lower latency than the conventional transmission schemes used in cellular-V2V (C-V2V) systems. Moreover, the proposed CST guarantees high reliability in various road environments and system settings.
Bibliographical noteFunding Information:
Manuscript received April 8, 2019; revised August 2, 2019; accepted September 11, 2019. Date of publication October 9, 2019; date of current version December 17, 2019. This work was supported in part by the National Research Foundation of Korea (NRF) grant funded by the Korean Government (MSIT) under Grant 2018R1A2A1A05021029, in part by the Institute for Information and communications Technology Promotion (IITP) grant funded by the Korean Government (MSIP) (Development on the core technologies of transmission, modulation and coding with low-power and low-complexity for massive connectivity in the IoT environment) under Grant 2016-0-00181. The review of this article was coordinated by Professor Y.-B. Lin. (Corresponding author: Daesik Hong.) T. Kim, H. Kim, and D. Hong are with the Information Telecommunication Lab., School of Electrical and Electronic Engineering, Yon-sei University, Seoul 03722, South Korea (e-mail: email@example.com; firstname.lastname@example.org; email@example.com).
All Science Journal Classification (ASJC) codes
- Automotive Engineering
- Aerospace Engineering
- Electrical and Electronic Engineering
- Applied Mathematics