Network coding and path protection-based optical network single-link fault protection method

Abstract

The present invention relates to a network coding and path protection-based optical network single-link fault protection method. According to the method, a 1+1 path protection and network coding-combined method is adopted, relay nodes are responsible for network coding; when overflow occurs on the buffer of a certain pair of nodes, a data packet which has been buffered for the longest time is transmitted along a protection path, and a 1+1 path protection method is used; and the packet header of the data packet is provided with an identification bit which is used for indicating whether the data packet has been subjected to network coding, if the identification bit is 1, it is indicated that the data packet has been subjected to network coding, and the identification bit is 0, it is indicated that the data packet has not been subjected to network coding, and a destination node receives the data packet transmitted along the protection path, reads packet header information, judges whether the data packet has been subjected to network coding and performs corresponding processing. With the network coding and path protection-based optical network single-link fault protection method of the invention adopted, the normal transmission of data in a network can be ensured when a single-link fault occurs on network links, and redundant data packets generated in the network due to a protection mechanism can be decreased.

Description

technical field [0001] The invention relates to a redundant path protection method in an optical network, which belongs to the technical field of communication. Background technique [0002] With the high degree of informatization in modern society, the scale of the Internet continues to expand. At the same time, the types of network services continue to increase, and the proportion of multimedia technologies combining audio and video is increasing. As a result, Internet traffic is increasing exponentially. All of these put forward higher requirements on network bandwidth and switching system capacity. The all-optical network is considered to be a network that can meet the rapidly growing bandwidth demand in the future. Since the transmission capacity carried by each wavelength in an optical network can be as high as gigabits per second, network failures (such as link breaks and node failures) will cause a large number of service interruptions, resulting in immeasurable eco...

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Problems solved by technology

However, since the copy of the data packet needs to wait in the buffer to encode the new data packet on its corresponding path, the end-to-end delay of the protection data packet will increase

Secondly, in methods (2) and (3), if there is a big difference in the traffic between the two paths for encoding, the data packets in the path with the larger traffic will accumulate in the buffer, eventually causing buffer overflow

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