基于PCE的光网络中的一种多域并行信令机制

摘要

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 se-rial processing in the establishment of the lightpath.In order to better cope with this challenge and solve the problem of laten-cy,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-do-main 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 efficien-cy.%在基于PCE(路径计算单元)的多域智能光网络中，对各域间有效的资源信息交互对的光路径分配提出了新的挑战，并且光路径的建路仍然存在传统的串行处理方式导致的时延问题。为了更好地应对这一挑战、解决时延问题，文章在 PCE技术的基础上，提出一种 MDPS(多域并行信令)机制，并提出一种 SCE (信令控制单元)，以实现快速的跨域光路分配。该机制充分利用 H-PCE(层次化PCE)技术，采用“主PCE/多个子PCE”的主从架构，每个子 PCE 均配备了 SCE。通过主 PCE 与 SCE的交互，各域分别独立并行地完成域内信令过程，以实现跨域光路径连接的快速建立。仿真结果表明，所提出的多域光网络快速光路径分配机制能够有效解决上述问题，并能有效提高光路径的分配效率。