Patent ID: 8885610
Filing Date: 2014-11-11
Classification: H04W

Abstract:
1. A communication control device that controls a communication path to a radio communication device by use of a first radio IP network in which a first care of IP address is dynamically assigned to the radio communication device in accordance with a position of the radio communication device, and of a second radio IP network in which a second care of IP address is assigned to the radio communication device, the communication control device, comprising: a relay unit configured to receive, from the radio communication device, an IP packet including the first care of IP address and being transmitted to a communication destination via the first radio IP network or an IP packet including the second care of IP address and being transmitted to the communication destination via the second radio IP network differing from the first radio IP network in a radio communication scheme, and to relay the received IP packet to the communication destination; an uplink communication quality acquiring unit configured to acquire just an uplink communication quality of the first radio IP network which is from the radio communication device to the communication control device; an uplink switching determination unit configured to determine whether or not to switch a network for the uplink from the first radio IP network to the second radio IP network for communication while continuing communication through the downlink of the first radio IP network on the basis of just the uplink communication quality acquired by the uplink communication quality acquiring unit; an uplink switching instruction transmitter configured to transmit, to the radio communication device, an uplink switching instruction to switch the network for the uplink from the first radio IP network to the second radio IP network for communication while continuing communication through the downlink of the first radio IP network when the uplink switching determination unit determines that the network for the uplink is to be switched to the second radio IP network; and a downlink switching instruction receiver configured to receive, from the radio communication device, a downlink switching instruction to switch a network for the downlink, which is from the communication control device to the radio communication device, from the first radio IP network to the second radio IP network; a downlink silence detector configured to detect a silent state in which communications are not executed in the downlink, on the basis of the IP packet received by the relay unit from the communication destination; and a downlink switching unit configured to switch the network for the downlink from the first radio IP network to the second radio IP network on the basis of the downlink switching instruction received by the downlink switching instruction receiver, wherein the downlink switching unit switches the network for the downlink from the first radio IP network to the second radio IP network while the downlink silence detector is detecting the silent state.