In Path Computation Element（PCE）-based multi-domain intelligent optical networks

lightpath provisioning is a new challenge to the effective resource interaction among various domains and there still exist latency arising from the traditional serial processing in the establishment of the lightpath.In order to better cope with this challenge and solve the problem of latency

this paper proposes a PCE-based Multi-Domain Parallel Signaling（MDPS）mechanism and a Signaling Control Element（SCE）so as to realize rapid cross-domain lightpath provisioning.This mechanism fully utilizes the Hierachical PCE（H-PCE）technology and adopts the client-server architecture of one main PCE/multiple sub-PCEs and each sub-SCE is equipped with a SCE.On the basis of the interaction between PCE and SCE

every domain independently and parallelly carries out the inter-domain signaling process to implement the fast establishment of cross-domain lightpath connection.Simulation results indicate that the proposed mechanism can effectively solve the above-mentioned problem and improve the lightpath provisioning efficiency.