Dynamic bandwidth allocating control apparatus with bandwidth usability improved

A bandwidth allocating control apparatus connected to a plurality of optical communication units to transmit and receive data to and from the communication units, wherein

• said apparatus has a reception bandwidth from the communication units divided into a bandwidth for short distance and a bandwidth for long distance, and
• said apparatus is responsive to a data transmission request received from a communication unit to allocate the reception bandwidth on a basis of a communication distance from said apparatus to the communication unit such that, when the communication unit is classified into a short-distance communication class, the bandwidth for short distance is allocated to the communication unit corresponding to a volume of data the communication unit requests to transmit, and, when the communication unit is classified into a long-distance communication class, a predetermined bandwidth in the bandwidth for long distance is allocated to the communication unit,
• said apparatus comprising:
• a residual bandwidth calculator for calculating a residual bandwidth of the bandwidth for short distance remaining unallocated after having allocated the reception bandwidth to the communication unit, when classified into the short-distance communication class;
• a middle-distance communication unit classifier for using a middle-distance boundary calculation model defining a relationship between the residual bandwidth and the communication distance to further classify the communication unit, when classified into the long-distance communication class, into a middle-distance communication class or the long-distance communication class;
• and
• a middle-distance bandwidth allocator for further allocating the residual bandwidth to the communication unit, when classified into the middle-distance communication class in addition to the predetermined bandwidth allocated;
• said apparatus transmitting allocation information on allocating the residual bandwidth to the communication unit, when classified into the middle-distance communication class.

A recording medium having a computer program recorded thereon, wherein said computer program, when running on a computer functioning as a bandwidth allocating control apparatus in an optical communication base station forming an optical access system together with a plurality of optical communication subscriber terminal units for optical communication with the subscriber terminal units, wherein

• said apparatus has a reception bandwidth from the subscriber terminal units divided into a bandwidth for short distance and a bandwidth for long distance, and
• said apparatus is responsive to a data transmission request received from any one of the subscriber terminal units to allocate the reception bandwidth on a basis of a communication distance from the base station to the one subscriber terminal unit so that, when the one subscriber terminal unit is classified into a short-distance subscriber terminal class, the bandwidth for short distance is allocated to the one subscriber terminal unit corresponding to a volume of data the one subscriber terminal unit requests to transmit, and, when the one subscriber terminal unit is classified into a long-distance subscriber terminal class, a predetermined bandwidth in the bandwidth for long distance is allocated to the one subscriber terminal unit,
• said computer program, when running on the computer, controlling the computer to function as:
• a residual bandwidth calculator for calculating a residual bandwidth of the bandwidth for short distance remaining unallocated after having allocated the reception bandwidth to the one subscriber terminal unit, when classified into the short-distance subscriber terminal class;
• a middle-distance subscriber terminal classifier for using a middle-distance boundary calculation model defining a relationship between the residual bandwidth and the communication distance to further classify the one subscriber terminal unit, when classified into the long-distance subscriber terminal class, into a middle-distance subscriber terminal class or the long-distance subscriber terminal class;
• and
• a middle-distance bandwidth allocator for further allocating the residual bandwidth to the one subscriber terminal unit, when classified into the middle-distance subscriber terminal class in addition to the predetermined bandwidth allocated;
• said apparatus transmitting allocation information on allocating the residual bandwidth to the one subscriber terminal unit, when classified into the middle-distance subscriber terminal class.