Abstract
This paper investigates resource allocation of latency constrained vehicle-to-vehicle (V2V) communication. When a subchannel of a vehicle-to-infrastructure (V2I) link can be reused by multiple V2V links, a nonlinear mixed integer optimization problem with the goal of maximizing the spectral efficiency of the system is derived under the constraints of minimum transmission rate of V2I links and transmission latency of V2V links. The subchannel allocation problem is solved by means of two-sided exchange matching theory, optimal transmission power of V2I and V2V links is solved based on the poly-block approximation (PBA) algorithm, and the system spectrum efficiency is maximized through loop iteration. In order to reduce the computational complexity of power allocation problem, a power allocation algorithm based on iterative convex optimization (ICO) is proposed. The convergence of the resource allocation algorithm is also proved. The simulation results show that the proposed algorithms can guarantee transmission latency requirements of V2V links and improve the system sum rate and access ratio of V2V links. Compared with two traditional algorithms, latency of poly-block approximation combined with many to one matching (PBAMTO) is reduced by 30.41% and 20.43%, respectively.
Highlights
Vehicle-to-vehicle (V2V) communication has potential to improve traffic safety, reduce energy consumption, and realize new services related to intelligent transportation systems [1]
In order to reduce the computational complexity of power allocation problem, a power allocation algorithm based on iterative convex optimization (ICO) is proposed
In order to reduce the computational complexity of power allocation problem, a power allocation algorithm based on ICO is proposed
Summary
Vehicle-to-vehicle (V2V) communication has potential to improve traffic safety, reduce energy consumption, and realize new services related to intelligent transportation systems [1]. In the 5G new radio vehicle-to-everything (NR-V2X) standard, the available resources [2] for direct communication between vehicles can be either dedicated or shared by vehicle-to-infrastructure (V2I) communication. V2V communication can be performed by the NR sidelink [3]. Document [4] points out that NR-V2X may be deployed in a carrier dedicated to intelligent transport systems services or a carrier shared with cellular services. It is claimed in [5] that the underlay sidelink communication has higher priority than the dedicated model to achieve higher spectrum utilization efficiency by reusing the spectrum resources of V2I communication. It brings interference problems to the resource allocation of V2X network
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