Patent ID: 7778251
Filing Date: 2010-08-17
Classification: H04L,H04Q

Abstract:
1. A bandwidth control apparatus that is connected with a plurality of other bandwidth control apparatuses in cascade through an upstream multiplexed signal line and a downstream multiplexed signal line, accommodates a plurality of access lines to which user terminals are connected and controls transmission bandwidths of the access lines, the bandwidth control apparatus comprising: a concentration unit that multiplexes upstream signals input from the plurality of access lines accommodated in the bandwidth control apparatus and upstream signals input from the other bandwidth control apparatuses located in a downstream direction and outputs the multiplexed signal as an upstream multiplexed signal, and branches a downstream multiplexed signal for broadcasting to the plurality of access lines accommodated in the bandwidth control apparatus as downstream signals and providing to the other bandwidth control apparatuses located in the downstream direction as the downstream signals; a first bandwidth state acquiring unit that collects bandwidth states of the plurality of access lines accommodated in the bandwidth control apparatus and acquires a bandwidth state in the bandwidth control apparatus; a second bandwidth state acquiring unit that acquires bandwidth states in the other bandwidth control apparatuses that are connected to one another in cascade; a bandwidth state allocating unit that calculates, a total bandwidth state of the bandwidth state acquired by the first bandwidth state acquiring unit and the bandwidth states acquired by the second bandwidth state acquiring unit, and allocates a transmission bandwidth to be controlled in the bandwidth control apparatus based on a ratio of the bandwidth state acquired by the first bandwidth state acquiring unit and the total bandwidth state; and a bandwidth state control unit that controls transmission bandwidths of the plurality of access lines accommodated in the bandwidth control apparatus on the basis of the transmission bandwidth allocated by the bandwidth state allocating unit.