Long-distance passive optical network protection method for single srlg fault

Abstract

The invention provides a long-distance passive optical network protecting method orienting single SRLG faults and belongs to the technical field of communication networks. According to the method, the reliability of each ONU and the union reliability among different ONUs are calculated according to a reliability evaluation model; protected service volume, newly increased and deployed between any pair of ONUs, of each back-up optical fiber is calculated, and then the cost efficiency of the back-up optical fibers is calculated out; the pair of ONUs with the maximum cost efficiency is decided, a back-up optical fiber link is deployed between the pair of ONUs, minimization of the back-up capacity newly increased is taken as the target, and the back-up capacity between the two ONUs is assigned; back-up capacity assignment and remaining back-up optical fiber deployment are carried out in an iterated mode according to the steps until all the ONUs in a network are protected completely; a back-up capacity assignment solution set and a back-up optical fiber deployment position are output. According to the long-distance passive optical network protecting method orienting the single SRLG faults, on the constraint of meeting the requirement for the reliability and protecting service completely, the deployment cost of the back-up optical fibers is minimized.

Description

technical field [0001] The invention belongs to the technical field of communication networks, and in particular relates to a long-distance passive optical network protection method facing a single SRLG fault. Background technique [0002] In recent years, the emergence of emerging broadband services such as video conferencing, interactive games, and multimedia applications has led to increasing user bandwidth requirements. In the past ten years, Internet traffic has shown an exponential growth trend with an annual growth rate of about 75%. The reason for this explosive growth in Internet traffic is mainly due to the emergence of a large number of new services, such as online content sharing applications and high-definition video applications. It is predicted by a large number of statistical results that in the next ten years, the application of network video will experience an annual growth rate of more than 47%. With the development of optical networks, the capacity and ...

AI Technical Summary

Problems solved by technology

There are many problems in the traditional passive optical network protection method, which cannot meet the longer transmission distance and better survivability requirements of LR-PON

In addition, most of the previous studies considered the failure of a single fiber link, and did not consider the correlation between different fiber link failures, such as the Shared-Risk Link Group (SRLG)

However, in large-scale LR-PON network deployment, multiple ONUs usually pass through the same physical resources (such as fiber tunnels), and potential SRLG failures pose higher challenges for survivable LR-PON network planning

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