Cache-Enabled Cooperative Edge Networks for Intelligent Connected Vehicles

Abstract

This paper investigates the effects of outdated channel state information on cache-enabled cooperative networks for intelligent connected vehicles, where part of the relay nodes can cache the files requested from the destinations. As the performance benchmark, the system outage probability with perfect and outdated CSIs is derived. The impacts of the system parameters, such as the number of relay nodes, the correlation coefficient, the channel fading power as well as the target data rate are analyzed by deriving the closed-form expressions on the system outage probability. From the analysis, we conclude that the diversity order of system outage probability with perfect CSIs is equal to the total number of relay nodes. While with outdated CSIs the diversity order remains one, regardless of the number of relay nodes. Specifically, the large number of cached relay and large correlation coefficient can significantly improve the system performance. Simulation results are present to validate the theoretical analysis.