Communication terminal containing apparatus, communication terminal apparatus, and radio communication system

A communication terminal accommodation device comprising:

• first communication control means for performing communication in a master-slave network;
• second communication control means for performing communication in a direct connection network;
• and
• identification signal inserting means for inserting an identification signal into a transmission signal to monitor each control mode period, wherein:
• an upper limit to the period of a distributed control mode is provided within a range not exceeding the length of a transmission unit for communication in the direct connection network.

A communication terminal accommodation device comprising:

• first communication control means for performing communication in a master-slave network;
• second communication control means for performing communication in a direct connection network;
• and
• identification signal inserting means for inserting an identification signal into a transmission signal to monitor each control mode period, wherein:
• said identification signal inserting means inserts the identification signal just after completion of the period of a distributed control mode, and
• communication in a centralized control mode is initiated immediately following the identification signal just after completion of the period of the distributed control mode, and the transmission of a frame of the master-slave network is initiated at the frame timing in the master-slave network.

A communication terminal accommodation device comprising:

• first communication control means for performing communication in a masterslave network;
• second communication control means for performing communication in a direct connection network;
• and
• identification signal inserting means for inserting an identification signal into a transmission signal to monitor each control mode period, wherein:
• said identification signal inserting means inserts the identification signal just after completion of the period of a distributed control mode, and
• the communication period of a variable-length packet in the master-slave network is provided immediately following the identification signal just after completion of the period of the distributed control mode so that frame transmission of the master-slave network will be initiated at the frame timing in the masterslave network.

A communication terminal accommodation device comprising:

• first communication control means for performing communication in a master-slave network;
• second communication control means for performing communication in a direct connection network;
• identification signal inserting means for inserting an identification signal into a transmission signal to monitor each control mode period;
• and
• monitoring means for monitoring traffic conditions in the communication, and communication period calculating means for calculating communication periods in the master-slave network and the direct connection network based on the traffic conditions.