Band allocation method, communication control unit and communication apparatus

A communication control unit for a node which requests a transfer band with respect to a managing apparatus that is coupled to the node via a network, comprising:

• a part configured to send tolerable values of a transfer rate and a compression rate to the managing apparatus at a time of a resetting;
• a part configured to send a transfer rate and a compression rate that are to be actually used to the managing apparatus, when making a request for the transfer band after the resetting;
• and
• a part configured to set the transfer band, the transfer rate and the compression rate to a transfer band, a transfer rate and a compression rate that are specified from the managing apparatus.

A communication apparatus comprising:

• a communication control unit for a node which requests a transfer band with respect to a managing apparatus that is coupled to the node via a network,
• said communication control unit comprising:
• a part configured to send tolerable values of a transfer rate and a compression rate to the managing apparatus at a time of a resetting;
• a part configured to send a transfer rate and a compression rate that are to be actually used to the managing apparatus, when making a request for the transfer band after the resetting;
• and
• a part configured to set the transfer band, the transfer rate and the compression rate to a transfer band, a transfer rate and a compression rate that are specified from the managing apparatus;
• and
• a host unit, coupled to the communication control unit, and installed with a software configured to control sending of an asynchronous packet that declares the transfer rate and the compression rate that are to be actually used when making the request for the transfer band after the resetting.

A communication control unit for a managing apparatus which receives a request for a transfer band from a plurality of nodes that are coupled to the managing apparatus via a network, comprising:

• a part configured to store tolerable values of a transfer rate and a compression rate received from each node at a time of a resetting;
• a part configured to receive a transfer rate and a compression rate that are to be actually used from each node, after the resetting;
• a part configured to detect a node that cannot secure a transfer band and to calculate a lacking bandwidth, with respect to a request for the transfer band;
• a part configured to detecting a node that can reduce a transfer band thereof and to specify a transfer rate and a compression rate with respect to the node that can reduce the transfer band thereof, based on the tolerable values of the transfer rate and the compression rate of each node and the transfer rate and the compression rate included in the request for the transfer band;
• and
• a part configured to specify the transfer band, the transfer rate and the compression rate as requested by the request for the transfer band, with respect to the node that cannot secure the transfer band.

A communication apparatus comprising:

• a communication control unit for a managing apparatus which receives a request for a transfer band from a plurality of nodes that are coupled to the managing apparatus via a network,
• said communication control unit comprising:
• a part configured to store tolerable values of a transfer rate and a compression rate received from each node at a time of a resetting;
• a part configured to receive a transfer rate and a compression rate that are to be actually used from each node, after the resetting;
• a part configured to detect a node that cannot secure a transfer band and to calculate a lacking bandwidth, with respect to a request for the transfer band;
• a part configured to detecting a node that can reduce a transfer band thereof and to specify a transfer rate and a compression rate with respect to the node that can reduce the transfer band thereof, based on the tolerable values of the transfer rate and the compression rate of each node and the transfer rate and the compression rate included in the request for the transfer band;
• and
• a part configured to specify the transfer band, the transfer rate and the compression rate as requested by the request for the transfer band, with respect to the node that cannot secure the transfer band;
• and
• a host unit, coupled to the communication control unit, and installed with a software configured to control specifying a transfer rate and a compression rate with respect to the node that can reduce the transfer band thereof, and specifying a transfer band, a transfer rate and a compression rate with respect to the node that cannot secure the transfer band with respect to the request for the transfer band.