MASTER STATION DEVICE, SLAVE STATION DEVICE, OPTICAL COMMUNICATION SYSTEM, CONTROL DEVICE, AND BANDWIDTH ALLOCATION METHOD

摘要

Included are a report-frame analysis unit that extracts a requested bandwidth from a report frame; an upload-bandwidth calculation unit that calculates the upload bandwidth; a residual-time calculation unit that acquires the residual time of each LLID before an allowable delay time; a priority calculation unit that acquires a priority of a data request corresponding to the report frame on the basis of the residual time; a report-request registration unit that generates a report request requesting allocation of an upload bandwidth for a report frame and that decides the priority of the report request; an allocation-order reading unit that decides the allocation order for the data request and the report request on the basis of the priority; and a gate-frame creation unit that decides a transmission-permitted time slot for each LLID on the basis of the allocation order and the upload bandwidth and that creates a gate frame.

主权项

1. A master station device that is connected to one or more slave station devices through an optical communication path and that allocates a bandwidth for communication in an upload direction, which is a direction from the slave station devices toward the master station device itself, to each of the slave station devices per logical link, the master station device comprising:
an analysis unit
that receives a bandwidth request signal requesting a bandwidth for transmitting upload data from the slave station device, andthat extracts a requested bandwidth of each logical link from the bandwidth request signal; a bandwidth calculation unit that calculates an upload bandwidth for transmitting the upload data on the basis of the requested bandwidth; a residual-time calculation unit that
holds an allowable delay time for each logical link for communication in an upload direction, andthat acquires a residual time of each logical link on the basis of the allowable delay time and an estimated value of a time for which the upload data stays in the slave station device; a priority calculation unit that acquires a priority of a bandwidth allocation request for transmitting the upload data, which is requested by the bandwidth request signal, on the basis of the residual time of each logical link; a bandwidth-request generation unit
that generates a bandwidth allocation request, which requests allocation of an upload bandwidth for transmitting a bandwidth request signal, for each logical link andthat decides a priority of a generated bandwidth allocation request; an allocation-order decision unit that decides an allocation order corresponding to the bandwidth allocation request on the basis of the priority; and a transmission-permission generation unit
that decides a transmission-permitted time slot corresponding to the bandwidth allocation request on the basis of the allocation order and on the basis of the upload bandwidth in each of the bandwidth allocation requests, andthat notifies the slave station device of the transmission-permitted time slot.