Abstract: A radio cell station includes a call connection control section that controls a call connection of a radio personal station PS; and a position registration request section that requests, of a management device ME, a position registration. When a request for handover from a radio cell station CS3 to a radio cell station CS4 is received from the radio personal station PS, the call connection of the radio personal station PS goes through the radio cell station CS4 and the radio cell station CS2. While the call connection going through the radio cell station CS2 is being conducted, the position registration is not requested of the management device ME. When the call connection going through the radio cell station CS4 and the radio cell station CS2 is ended, the position registration is requested of the management device ME.

Abstract: A radio cell station CS that relays a call connection of a radio personal station PS to a management device ME, includes: a call connection control section that controls the call connection of the radio personal station PS; and a position registration request section that requests, of the management device ME, a position registration that associates identification information on the radio personal station PS with identification information on the radio cell station CS. When a request for handover from a radio cell station CS3 to a radio cell station CS4 is received from the radio personal station PS that conducts the call connection through the radio cell station CS, the call connection of the radio personal station PS goes through the radio cell station CS4 and the radio cell station CS2 under control. While the call connection going through the radio cell station CS2 is being conducted, the position registration is not requested of the management device ME.

Abstract: A radio cell station includes a call connection control section that controls a call connection of a radio personal station PS; and a position registration request section that requests, of a management device ME, a position registration. When a request for handover from a radio cell station CS3 to a radio cell station CS4 is received from the radio personal station PS, the call connection of the radio personal station PS goes through the radio cell station CS4 and the radio cell station CS2. While the call connection going through the radio cell station CS2 is being conducted, the position registration is not requested of the management device ME. When the call connection going through the radio cell station CS4 and the radio cell station CS2 is ended, the position registration is requested of the management device ME.

Abstract: An communication apparatus relays communication between a network device and an IP network, and assigns an IP address within a reserved range of IP address to the network device. The communication apparatus includes an address setter that sets an IP address of the communication apparatus; and the address conflict determiner that determines whether or not the IP address of the communication apparatus conflicts with the IP address of the network device, based on a result of query to the network device. When the IP address of the communication apparatus conflicts with the IP address of the network device, the address setter changes the IP address of the communication apparatus to a new IP address selected out of a reserved range of IP address.

Abstract: An communication apparatus relays communication between a network device and an IP network, and assigns an IP address within a reserved range of IP address to the network device. The communication apparatus includes an address setter that sets an IP address of the communication apparatus; and the address conflict determiner that determines whether or not the IP address of the communication apparatus conflicts with the IP address of the network device, based on a result of query to the network device. When the IP address of the communication apparatus conflicts with the IP address of the network device, the address setter changes the IP address of the communication apparatus to a new IP address selected out of a reserved range of IP address.