  Virtual network embedding (VNE) is an crucial part of network virtualization
(NV), which aims to map the virtual networks (VNs) to a shared substrate
network (SN). With the emergence of various delay-sensitive applications, how
to improve the delay performance of the system has become a hot topic in
academic circles. Based on extensive research, we proposed a multi-domain
virtual network embedding algorithm based on delay prediction (DP-VNE).
Firstly, the candidate physical nodes are selected by estimating the delay of
virtual requests, then particle swarm optimization (PSO) algorithm is used to
optimize the mapping process, so as to reduce the delay of the system. The
simulation results show that compared with the other three advanced algorithms,
the proposed algorithm can significantly reduce the system delay while keeping
other indicators unaffected.
