Abstract: In order to ensure security even when packet communication is performed using a plurality of communication paths of a public network, a transmitter stores a first communication pattern. First and second communication units perform packet communication with third and fourth communication units. The packet communication is performed in accordance with the first communication pattern, with dummy packets being inserted into at least one of the groups of packets to be transmitted. A processor restores original data from valid packets, which are remaining packets after the dummy packets are removed, in accordance with a second communication pattern.

Abstract: In order to ensure security even when packet communication is performed using a plurality of communication paths of a public network, the communication system (1) has a configuration wherein: the transmitter (2) includes a first storage unit (11) that stores a first communication pattern, first and second communication units (12, 13) that perform packet communication with a receiver (3), and a first processor (16) that controls communication units (12, 13); and the receiver (3) includes a second storage unit (21) that stores a second communication pattern, third and fourth communication units (22, 23) that perform the packet communication with the transmitter (2), and a second processor (26) that controls communication units (22, 23), whereby processor (16) transmits packets from communication units as selected in accordance with the first communication pattern and inserts dummy packets into at least one of the groups of packets to be transmitted, and the second processor (26) restores original data from vali

Abstract: Provided is a wireless communication method wherein the transmission timing control that follows the movements of mobile stations can be performed. A transmission timing control information generating unit (8h) of a base station calculates transmission timings, at which a plurality of mobile stations transmit signals, on the basis of the delay times of the respective mobile stations measured by a delay time measuring unit (8f) and on the basis of the movement speeds of the respective mobile stations detected by a movement speed detecting unit (8i). The transmission timing control information generating unit (8h) generates and reports, to the mobile stations, control information indicating the calculated transmission timings.