Patent ID: 9356625
Filing Date: 2016-05-31
CPC Classification: H03M,H04J,H04L

Claim Text:
1. A frame generation method in an optical transmission system that transmits a transmission frame including a payload area for storing therein information data and a code area for storing therein an error correcting code with respect to the information data, the frame generation method comprising: a coding-gain calculation step of calculating coding gain based on quality of a communication path through which the transmission frame is transmitted; and a transmission-frame generation step of setting a variable parity area for storing therein the error correcting code in the payload area and generating a transmission frame in which the error correcting code is stored in the code area and the variable parity area, when it is determined that redundancy is insufficient with an error correcting code stored in the code area based on the coding gain, wherein tributary slots are allocated to the payload area, and the variable parity area is set in units of the tributary slots in the transmission frame generation step.