Abstract: A transmission control method includes performing communication between a transmission source communication device and a transmission destination communication device by using a transmission control protocol which includes a plurality of congestion control functions corresponding to a plurality of congestion control methods, respectively, and causing, when the transmission source communication device and the transmission destination communication device switch from a first congestion control function to a second congestion control function, at least one of a plurality of parameters for controlling operating states in the first congestion control function to be inherited by a parameter for controlling an operating state in the second congestion control function.

Abstract: A base station includes a deciding part configured to decide a period of performing data transmission/reception and a period of not performing data transmission/reception when performing intermittent communications, a generating part configured to generate a predetermined signal to a mobile station, and an adjusting part configured to adjust the period of performing data transmission/reception and/or the period of not performing data transmission/reception according to a response signal transmitted from the mobile station in response to the predetermined signal.

Abstract: A wireless communication system, including: a first wireless base station disposed on a first wireless network; a second wireless base station disposed on a second network; and a mobile station that includes a communication controller, which controls wireless communication; wherein in the case where the mobile station attempts to switch communication to the second wireless network while coupled to the first wireless base station and communicating on the first wireless network, the communication controller temporarily synchronizes with the second wireless base station, and obtains an address pointer for acquiring network configuration information from the second wireless base station, the network configuration information containing information regarding the network configuration of the second wireless network, and after obtaining the address pointer, the communication controller recouples with the first wireless base station, accesses the data acquisition location specified by the address pointer via the firs

Abstract: A wireless communication apparatus attachable to an information processing apparatus. The wireless communication apparatus includes a wireless communication interface configured to perform wireless communication. The wireless communication apparatus also includes a processor configured to input, on detecting an error in the wireless communication interface, a signal for recognizing a temporary interruption to the information processing apparatus, and to initialize the wireless communication interface.

Abstract: A wireless connecting method includes a connection monitoring step, a connection parameter retaining step, and a connection restoring step. The connection monitoring step monitors the wireless connection between the communication terminal device and the base station. The connection parameter retaining step sets a communication session retention time period that is longer than a connection parameter retention time period, and retains a connection parameter. A connection parameter when the wireless connection is disconnected is retained in at least one of the communication terminal device and the base station for the communication session retention time period exceeding the connection parameter retention time period.

Abstract: A home agent used in a mobile communications system conforming to Mobile IP is disclosed. A mobile node belongs to the home agent, and the home agent has a global IP address that is a home address common to a plurality of mobile nodes. The home agent includes: an interface unit configured to route a received packet according to a transfer table that includes a correspondence among a home address of the mobile node, a care of address of the mobile node, and a communication session identification number for identifying a communication session opened by an application of the mobile node, wherein a transfer destination of the received packet is identified by a combination of the care of address and the communication session identification number; and a location information management unit configured to manage the transfer table.

Abstract: In a wireless communication system, time point information is transmitted from a second wireless base station. The time point information indicates a time point at which service information is transmitted from the second wireless base station. Moreover, at the time point indicated by the time point information, the service information is transmitted from the second wireless base station. On the wireless terminal side, firstly, the time point information is obtained in a first non-communication period in which communication with the first wireless base station is temporarily stopped. Then, the service information is obtained in a second non-communication period which is ensured in accordance with the time point indicated by the time point information.

Abstract: A mobile terminal used in a wireless communication system includes a first base station group for which base station information is advertised to the mobile terminal, a second base station group for which the base station information is not advertised to the mobile terminal, the mobile terminal being able to access each base station in the first base station group and a specified base station in the second base station group. The mobile terminal includes a unit to receive location information, and a unit to execute base station detection processing regarding the first base station group and the second base station group when the location information is associated with the specified base station, and to execute the base station detection processing regarding the first base station group while restricting the base station detection processing regarding the second base station group when the location information is not associated with the specified base station.

Abstract: At the time of exchanging routing information of a remote site, it is examined whether there is duplicated routing information, and when the duplicated routing information exists, an address conversion rule is generated. With this, when performing communication, address conversion is performed only for the communication to a site having a duplicated network address. In case of communication to a site having no duplicated network address, by performing IP communication intact, it becomes possible to omit unnecessary address conversion processing in a gateway. Also, when there is a duplicated address, by assigning a new network address which is not used in a site under a gateway to the duplicated address included in the routing information, and distributing the newly assigned address, it becomes possible to transmit a packet to a gateway appropriate to each destination, when there are a plurality of gateways in a subnet.

Abstract: A wireless communication system, including: a first wireless base station disposed on a first wireless network; a second wireless base station disposed on a second network; and a mobile station that includes a communication controller, which controls wireless communication; wherein in the case where the mobile station attempts to switch communication to the second wireless network while coupled to the first wireless base station and communicating on the first wireless network, the communication controller temporarily synchronizes with the second wireless base station, and obtains an address pointer for acquiring network configuration information from the second wireless base station, the network configuration information containing information regarding the network configuration of the second wireless network, and after obtaining the address pointer, the communication controller recouples with the first wireless base station, accesses the data acquisition location specified by the address pointer via the firs

Abstract: A communication control method, for a radio communication system including a radio base station, a radio terminal, and a relay station that receives a radio signal transmitted from the radio base station and relays the radio signal to the radio terminal at a transmission frequency different from a reception frequency, includes broadcasting information on one or more transmission frequencies of radio base stations or relay stations from the radio base station; and determining, by the radio terminal, whether transmission-source identification information included in the radio signals that are received before and after switching the reception frequency match, the switching being conducted based on the information broadcasted from one of the radio base station directly and via the relay station, wherein if the radio terminal determines that the transmission-source identification information matches, the radio terminal omits a terminal registering procedure after frame-synchronization with the radio communication

Abstract: A community control server stores in a community defining table, data of a correspondence between Interior Gateway Protocol (IGP) routers that are connected to a community and another community. The community control server collects prefix data that is included in routing information that is received by the IGP routers and identification data of the IGP routers. Based on the community defining table and the identification data, the community control server detects a community corresponding to a prefix. Upon receiving data of whether to transmit the routing information in the form of the permission to distribute them between communities, based on data of the community the community control server determines the prefix corresponding to the source community and transmits the prefix data to the IGP routers.

Abstract: In a virtual network construction method, a virtual network construction system, and a relaying apparatus within a public data communication network, control packets each having set a multicast address are multicast, and upon reception of the control packets by the relaying apparatuses belonging to the multicast address group, virtual links to the transmitting sources of the control packets are established and reply packets are returned through the virtual links, whereby the virtual links are established between all of the relaying apparatuses belonging to the multicast address group to establish the virtual network.

Abstract: A base station includes a deciding part configured to decide a period of performing data transmission/reception and a period of not performing data transmission/reception when performing intermittent communications, a generating part configured to generate a predetermined signal to a mobile station, and an adjusting part configured to adjust the period of performing data transmission/reception and/or the period of not performing data transmission/reception according to a response signal transmitted from the mobile station in response to the predetermined signal.

Abstract: The hierarchical packet processing system comprises a relay unit and a server, which relay received packets. The relay unit comprises a call unit for calling up a prescribed service processing unit for performing the service process of a received packet, a first service processing unit for performing the service process of the received packet by the call of the call unit, a second service processing unit for performing a virtual service process of the received packet by the call of the call unit. The server comprises an external service processing unit for performing the arbitrary service process of the received packet instead of the second service processing unit when the call unit calls up the second service processing unit.

Abstract: A radio communication method for performing radio communication between a base station and a terminal, including the steps of: comparing field strength of the base station which transmitted a reconnection instruction and filed strength of an adjacent base station which locates adjacent to the base station, when the terminal in a power saving standby mode receives the reconnection instruction from the base station, and controlling whether the terminal reconnects or not to the base station which transmitted the reconnection instruction, according to the result of the comparison.

Abstract: Configuration information set in one virtual path configuration apparatus is shared with all the virtual path configuration apparatuses in the virtual private network. The configuration information may be shared by transmitting the configuration information to other virtual path configuration apparatuses or receiving configuration information from the other virtual path configuration apparatuses.

Abstract: A frame forwarding system which has a plurality of frame forwarding devices and links to transport frames between external networks that belong to a particular group. This system is designed to prevent backbone links from being blocked even when there is a backdoor link that forms a potential loop in the network. A system state sharing unit in a frame forwarding device shares system state information with other frame forwarding devices. This information sharing enables all the frame forwarding devices and inter-node links to behave as a single virtual device for forwarding frames between external networks that belong to a particular group. A frame forwarding processor forwards received frames according to the system state information shared among all the frame forwarding devices in the system.

Abstract: A control device includes a virtual IF set to associate with address information of an interface on a forwarding device and, when detecting that an application section accesses the virtual IF, requests the forwarding device to set a packet transfer rule for transferring a packet received on an interface to the control device while making the packet associate with the virtual IF. The forwarding device sets the packet transfer rule requested by the control device.

Abstract: A radio communication system, including; a first and second base station; and at least one terminal, wherein the first base station including: an advertisement message generation unit which generates an advertisement message including channel information of the second base station; a handover request message generation unit which generates a handover request message including a handover instruction to the second base station; and a transmission unit which transmits the advertisement message and the handover request message to the terminal, and the terminal including: a receive unit which receives the advertisement message and the handover request message; and a terminal side handover processing unit which detects whether a handover to the second base station instructed by the handover request message is possible, and performs handover to the second base station, using the channel information of the second base station included in the advertisement message, if the handover can be possible.