Abstract
With the development of autonomous vehicles, the high reliability and low latency vehicular communication technologies have become more critical. The Third Generation Partnership Project (3GPP) specifies the sidelink (SL) transmission based on New Radio (NR), aiming to meet stringent vehicle-to-everything (V2X) requirements. Compared with Long Term Evolution (LTE) V2X, which only supports broadcast use cases, NR V2X also supports unicast and groupcast. The groupcast operation allows the transmitter to communicate with multiple receivers in the same group at once. In general, the group size for vehicles is limited due to the high-reliability requirement. In this paper, we present reliable blind retransmission for NR V2X groupcast. We improve the groupcast transmission reliability by assigning the proper retransmission user equipment(UE). This paper proposes a retransmission UE assignment. We formulate a retransmission UE selection problem to maximize the group packet reception ratio (GPRR) for NR V2X distributed groupcast. The simulation results show that the proposed retransmission method improves the V2X groupcast in terms of GPRR, packet inter-reception time (PIR), and the available group size.
Highlights
The Third Generation Partnership Project (3GPP) specified the support of Long Term Evolution (LTE) vehicleto-everything (V2X) for various vehicular use cases since release 14
CONTRIBUTION AND ORGANIZATION We provide an introduction about the distributed resource allocation for New Radio (NR) V2X, which is an essential feature of 5G
In this paper, we present reliable blind retransmission for NR V2X groupcast mode 2
Summary
The Third Generation Partnership Project (3GPP) specified the support of Long Term Evolution (LTE) vehicleto-everything (V2X) for various vehicular use cases since release 14. This paper focuses on the blind retransmission for the groupcast scenario, which is the vital technology to support advanced V2X use cases with high reliability and low latency requirement. By adding the payment on interference, transmission power control is distributedly performed Another resource allocation research discusses the group-based V2V communications with different Quality of Service (QoS) requirements [7]. Since the reserved resource information is the same in initial transmission and retransmission, the other sensing UE can exclude these resources as long as one of these SCI is decoded.It is worth noting that NR V2X mode 2 is similar to LTE V2X mode 4. Where μ = 9 + max (0, 15 ∗ log10(d) − 41) dB, σ = 4.5 dB First of all, we provide a model to evaluate the transmission performance based on different retransmission UEs and formulate it into an optimization problem. Where PT x−Rx is the failure probability of initial transmission and PT x−RT + (1 − PT x−RT ) · PRT −Rx is the failure probability of transmission retransmitted by retransmission
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