Patent ID: 8724991

Claim:
A dynamic communication bandwidth allocation method for allocating a communication band to each of a plurality of subscriber-side terminal devices in a PON system that connects, via an optical coupler, the plurality of subscriber-side terminal devices and an station-side terminal device to perform communication, the method, in the station-side terminal device, comprising: receiving, by the station-side terminal device, a requested bandwidth, which is a bandwidth that the relevant subscriber-side terminal device requires for the communication, from each of the subscriber-side terminal devices; calculating, by the station-side terminal device, a usable communication bandwidth as a first allocation bandwidth for each of the subscriber-side terminal devices based on a ratio of a service level parameter predetermined for each of the subscriber-side terminal devices, comparing the first allocation bandwidth and the requested bandwidth, and allocating the requested bandwidth to the subscriber-side terminal device if the first allocation bandwidth is more than the requested bandwidth, and allocating the first allocation bandwidth to the subscriber-side terminal device if the first allocation bandwidth is less than the requested bandwidth; and obtaining, by the station-side terminal device, an updated usable communication bandwidth updated by subtracting a sum of the allocated bandwidths from the usable communication bandwidth, and obtaining an updated requested bandwidth updated by subtracting the allocated bandwidth from the requested bandwidth, and allocating the updated usable communication bandwidth to each of the subscriber-side terminal devices as a second allocation bandwidth based on a ratio of the updated requested bandwidth.