Abstract: A communication method executed by a processor included in a communication device, the communication method includes starting transmitting a first frame; when an opportunity to transmit a second frame having a higher priority than the first frame occurs during transmission of the first frame, generating a third frame including a part of data of the first frame; transmitting the generated third frame; transmitting the second frame after transmitting the generated third frame; generating a fourth frame including a header of the first frame and untransmitted data of the first frame after transmitting the second frame; and transmitting the generated fourth frame.

Abstract: A communication device includes, a plurality of authentication generation processing units, which are respectively associated with different sequence number groups each including successive sequence numbers and which execute, in parallel, authentication generation processes for generating authentication information included in the packets based on sequence numbers allocated to the packets, a transmitting unit which transmits packets including the allocated sequence numbers to another communication device in an order in which authentication generation processes by the plurality of authentication generation processing units are completed, a receiving unit which receives a packet from the other communication device, and an authentication processing unit which executes a first authentication process in which the reception packet is authenticated based on a relationship between a sequence number of the reception packet and a sequence number of a preceding reception packet.

Abstract: An encrypted communication device includes: a pattern generation unit configured to judge whether or not a security association including as matching data a data portion whose data pattern matches between data in a packet targeted for processing and data in a sample packet is to be generated; a key information exchange unit configured to transmit to an opposite device a key information exchange packet including the matching data and key data when the pattern generation unit judges that the security association is to be generated, and receives from the opposite device a key information exchange packet including a security association identifier of the security association, thereby establishing the security association with the opposite device; and a key information unit configured to store the matching data, the key data, and the security association identifier of the security association established by the key information exchange unit.

Abstract: A base station communicates with a mobile station consecutively transmitting a predetermined number of data for each predetermined time interval. The base station includes a measuring unit that using a predetermined threshold value, determines reception quality of the predetermined number of data that are consecutive and received from the mobile station; and a control unit that in response to a result of the measurement by the measuring unit, executes control to output any one among first notification information to cause the mobile station to transmit the same data, for the predetermined time interval and second notification information to cause the mobile station to transmit plural data that are different from one another, for the predetermined time interval.

Abstract: An encrypted communication device includes: a pattern generation unit configured to judge whether or not a security association including as matching data a data portion whose data pattern matches between data in a packet targeted for processing and data in a sample packet is to be generated; a key information exchange unit configured to transmit to an opposite device a key information exchange packet including the matching data and key data when the pattern generation unit judges that the security association is to be generated, and receives from the opposite device a key information exchange packet including a security association identifier of the security association, thereby establishing the security association with the opposite device; and a key information unit configured to store the matching data, the key data, and the security association identifier of the security association established by the key information exchange unit.

Abstract: A base station communicates with a mobile station consecutively transmitting a predetermined number of data for each predetermined time interval. The base station includes a measuring unit that using a predetermined threshold value, determines reception quality of the predetermined number of data that are consecutive and received from the mobile station; and a control unit that in response to a result of the measurement by the measuring unit, executes control to output any one among first notification information to cause the mobile station to transmit the same data, for the predetermined time interval and second notification information to cause the mobile station to transmit plural data that are different from one another, for the predetermined time interval.

Abstract: A mobile communication system including a plurality of base stations includes a radio communicator for communicating with mobile terminal devices with a plurality of carriers, and a communication controller for changing radio field intensity of the radio communicator; and a management device including: a storage for storing information of each of the base stations, the information including time slots and a number of registration requests from the mobile terminal devices in each communication area of the base station in accordance with the time slots, and an instructor for instructing to change radio field intensity of the plurality of carriers to the radio communicator in the base stations on the bases of the stored information in the storage when the number of the registration requests in the time slot exceed a specified predetermined threshold value.