Method for upgrading secret key in Gigabit passive optical network and optical line terminal

Abstract

A method for key updating in gigabit-capable passive optical network (GPON) is provided: after the encryption process for the current downlink GPON transmission convergence (GTC) frames executed by the OLT (optical line terminal), obtaining the corresponding new key identifier and the key switching frame number; for each ONU ID, if the value of the corresponding new key identifier is TRUE, and the key switching frame number is the current GTC frame number add one, confirming that the key for the corresponding ONU should be switched, obtaining the corresponding new key, and updating the value of the corresponding new key identifier into FALSE; updating the current key with the new key obtained. An optical line terminal OLT is also provided in the present invention. The present invention carries out the key switching process with flow operation, and can improve the key switching rapidity and the stability of downlink data flow.

Description

technical field [0001] The invention belongs to the technical field of gigabit passive optical network (GPON), in particular to a method for renewing keys in GPON and an optical line terminal (OLT) Background technique [0002] The optical access network can solve the bottleneck of the fixed network, that is, the access network problem. At present, it is becoming the new darling of the access network with its attractive cost performance, and the passive optical network (PON) has become one of them because of its simple topology and low maintenance cost. sharp. As one of the main technologies of PON, GPON not only attracts operators with rich OAM functions, but also slows down the commercial progress due to the complexity of technical implementation. [0003] In a GPON system, an optical line terminal (OLT) at the central office controls multiple optical network units (ONUs) at the user end, and the OLT broadcasts fixed-length transmission convergence (GTC) frames to the ONU...

AI Technical Summary

Problems solved by technology

[0005] In the current AES key update mechanism, the key switching of the next ONU starts after the key switching of one ONU is completed. The key switching of a single ONU monopolizes resources, making the overall key switching time too long. The number limit of secondary key switching brings defects to the system design, and on the other hand, it leads to the reduction of the actual downlink rate, which may lead to the OLT downlink interruption or even system restart of some designs.

Images