Patent ID: 8184976
Filing Date: 2012-05-22
Classification: H04J,H04Q

Abstract:
1. A passive optical network system comprising: a master station; a plurality of slave stations; and an optical fiber network including an optical splitter and a plurality of optical fibers; wherein the master station and the plurality of slave stations are connected via the optical fiber network, and the master station decides volumes and timings of signals to be transmitted from the plurality of slave stations to the master station individually in accordance with requests from the plurality of slave stations, and receives the signals from the plurality of slave stations multiplexed on the optical fiber network; wherein the master station includes: a bandwidth control unit which decides, for every first period of plural first periods, a volume of a transmission signal to be granted to each slave station in said every first period in which bandwidth assignment calculation is executed based on the requests from the plurality of slave stations; a transmission timing control unit which decides a transmission timing in which the slave station should transmit the signal in each one of a plurality of second periods with a same periodic frame length and composes the first period in accordance with the volume of the signal decided by the transmission timing control unit; and a control unit by which, when an en bloc signal granted to any one of the plurality of slave stations by the bandwidth control unit is fragmented and to be transmitted over the plurality of second periods by the transmission timing control unit, the bandwidth control unit and/or the transmission timing control unit are controlled based on a volume of a signal and overhead to be attached due to the fragmentation, so that the granted signal can be transmitted within the first period.