Abstract: A mobile communication system includes a plurality of base stations in a communication service area connected to a packet communications network. A mobile station communicates with a second station through the plurality of base stations and the network. The mobile communication system determines a virtual base station group as an aggregation of the plurality of base stations communicating with the mobile station, based on a condition of a radio transmission path between the mobile station and each base station, and combines information received by the plurality of base stations that belong to the virtual base station group at a base station included in the virtual base station group. The network connects the plurality of base stations non-hierarchically and the base station transmits combined information to the second station through the network relative to combined packets having the second station as a destination.

Abstract: The present invention provides a packet communication system has a mobile host, a home agent, a correspondent host, and a mobility agent, wherein the mobility agent operates in such a way that in the case of an active mode and no need for buffering of packet, the mobility agent forwards a packet received from the home agent or the correspondent host, to the mobile host, that in the case of the active mode and necessity for buffering of packet, the mobility agent buffers the packet, and that in the case of an idle mode, the mobility agent buffers the packet and notifies the mobile host of arrival of the packet, in order to prevent the loss of a packet addressed to a mobile host, to decrease the traffic of Binding Update packets, to decrease the transmission frequency of Binding Update packets where the mobile host sends or receives no packet for a long period of time, and to send a packet a destination of which is a node present at a mobile network.

Abstract: A mobile communication system comprises a plurality of transfer devices configured to transfer packets to a visited position of a mobile terminal, a plurality of connection management devices arranged in a network and configured to connect to the mobile terminal, and a mobile terminal including a detection unit configured to detect the transfer device, and a communication unit configured to connect to the connection management device, and transmit/receive packets to/from the transfer device detected by the detection unit via the connection management device.

Abstract: A mobile node 100 according to the present invention sequentially transmits a plurality of packets A1 to A4 addressed to a correspondent node 51 severally at an interval within 5 ms. The mobile node 100 includes a buffer area 131 and an IP 13. The buffer area 131 buffers the plurality of packets A1 to A4. The IP 13 transmits, to the correspondent node 51, a front packet A1 included in the plurality of packets A1 to A4 buffered in the buffer area 131. Then the IP 13 transmits the remaining packets A2 to A4 to the correspondent node 51 after 15 ms has passed from a time point when the front packet A1 was transmitted.

Abstract: In a packet communication system 1, 31 (51, 81) comprised of nodes and links, a destination node 3 (53) as a destination of a packet transmitted from correspondent node 2 (52) is provided with an advertisement receiving device 3e (53e) for receiving an advertisement of path information about a path from the correspondent node 2 (52) to the destination node 3 (53); a Path MTU discovery execution determining device 3f (53g) for determining whether a discovery of a Path MTU of the path from correspondent node 2 (52) to destination node 3 (53) should be executed, based on the path information; a Path MTU setting device 3g (53f) for setting the Path MTU on the basis of the path information; and a Path MTU announcing device 3h (53h) for announcing the Path MTU set by the Path MTU setting device 3g (53f).

Abstract: In a state I, a link layer of a mobile host is connected to an access router and a default router is set to the access router such that data packets (P1) and (P2) reach the access router and are routed to a correspondent host. In states II and III, data packets (P3) to (P8) are not transmitted but are buffered. When the mobile host switches the default router from the access router to an access router upon reception of a router advertisement from the access router, processing moves to a state IV and the buffered data packets (P3) to (P8) are transmitted. Since the link layer of the mobile host is connected to the access router and the default router is set to the access router, the data packets (P3) to (P8) reach the access router and are routed to the correspondent host.

Abstract: A configuration comprises a destination address extracting/rewriting device 4 for extracting a destination address of a packet; a common-route packet extracting device 8 for extracting two or more packets having a common route at least in part of routes to their respective terminals from a plurality of packets, based on their extracted destination addresses; an aggregate packet creating device 9 for aggregating the plurality of packets having the common route at least in part of the routes to create an aggregate packet including information of each of the packets; a destination address giving device 10 for giving the aggregate packet a destination address so that the destination address of the aggregate packet is an address of an adjacent node on the common route; and an aggregate packet routing device 11 for routing the aggregate packet, based on the destination address.

Abstract: A packet transmission system is provided to achieve a higher throughput in downlink packet transmission to a mobile node. When there is a packet call directed to the mobile node, a transmission node in a network in this packet transmission system retrieves information as to a connection point of the mobile node from a distribution location information holder of a home agent. Packets are inputted to a packet distributor situated at the logical location designated by the retrieved connection point information. The packets are then distributed by the packet distributor to radio transmission devices, and are transmitted at once.

Abstract: When a mobile node MN moves from an access router AR3 to another access router AR4, it sends a multi-binding on request to a mobility agent MA1 and then moves ({circle over (1)}). Receiving the multi-binding on request, the mobility agent MA1 voluntarily configures prospective CoA's (probable CoA's) The probable CoA's are added as forwarding addresses while an M bit is set on in an register of the mobile node MN on a binding cache ({circle over (2)}). When the mobility agent MA1 receives a capsuled packet addressed to the mobile node MN thereafter, it tunnel-forwards the packet to CoA3, probable CoA2, and probable CoA4 according to the binding cache ({circle over (3)}).

Abstract: A packet transmission system includes a home agent providing a home link and a home address to a mobile node, one or more access routers, each providing a foreign link and a c/o address to the mobile node, and one or more mobility support routers that relay a packet to the destination between the mobile node and the home agent or a counterpart correspondent node. When the mobile node moves into a new foreign link, the corresponding access router transmits a registration request to the home agent and/or the correspondent node. When acquiring a registration request on the way to the destination, each mobility support router stores an entry having the home address of the mobile node and the c/o address contained in the registration request, and produces and transmits a new registration request updating the c/o address to its own address.

Abstract: In a mobile communication system, the PAD of the data-processing-terminal-interface has a packet assembling/disassembling function for the protocol for data-link layer A and the protocol for data-link layer B. The protocol for data-link layer A of the data processing terminal prescribes that a frame, in which data transferred from the upper layer is inserted between flag sequences with a prescribed bit pattern, be transmitted usually, and that flag sequences without data transmission be transmitted when there is no data requiring transmission during communication. If flag sequences are transferred from the data processing terminal, the PAD deletes a part or all of the flag sequences and does not transfer them to the wireless communication unit. Consequently, a part or all of the flag sequences are not transmitted to the wireless communication channel. Therefore, power consumption by a wireless mobile station device or the like may be reduced, and the wireless channel may effectively used.

Abstract: A mobile communication system can implement broadcasting control that generates broadcast information autonomously in a distributed manner, thereby obviating the need for an RNC (Radio Network Controller). Each base station has an IP address and a base station multicast address. Each base station sends its own system information to all base stations using the multicast address. Each base station generates its broadcast information from its own system information and the system information received from other base stations. Thus, it can generate the broadcast information autonomously in a distributed manner without using the RNC.

Abstract: The present invention is directed to a radio communication method of communications between two radio stations, wherein information about the radio communication method with which each radio station is equipped as software is exchanged mutually between the above-mentioned two radio stations by communicating according to a predetermined first radio communication method, a radio communication method suitable for a communication application to be used for communication of the two radio stations concerned is selected from radio communication methods with which at least one of the two radio stations is equipped as the second radio communication method based on the information about the radio communication method with which each radio station is equipped, software of the second radio communication method is transmitted from a radio station equipped with the second radio communication method to the radio station which is not equipped with the second radio communication method according to the first radio communicati

Abstract: A method for providing information, a mobile communication system and a communication apparatus are provided with high reliability of providing information to mobile terminals. The router transfers the information packets obtained from the Internet to all of the access points. Each of the access points transmits those information packets to a service area of its own provided by the access point. Therefore, the mobile terminal located in the service area provided by any of the access points can receive the information packets, thereby the reliability of providing information to the mobile terminals is improved.

Abstract: There is disclosed a link manager comprises detecting unit for detecting what link is installed; managing unit for defining a plurality of link metrics indicating characteristics of each link detected and managing data corresponding to the respective link metrics on a table; and selecting unit for selecting a link having link metrics complying with a given condition.

Abstract: The present invention improves receiving quality compared to the prior art even if instantaneous control of transmission power is not executed. A mobile station MS#0 measures signal level received from surrounding base stations and determines to which base stations it is to be connected in order to satisfy a desired downlink receiving quality (step S1). The mobile station MS#0 notifies a radio network control station RNC of the desired based stations to which the mobile station is to be connected (step S2). Upon receiving the notification from the mobile station MS#0, the radio network control station RNC duplicates a downlink transmitted signal for the mobile station MS#0, if any, and transmits it to the selected base stations (step S3). The mobile station MS#0 receives signals transmitted by the base stations (step S4) and synthesizes these signals (step 5), thereby satisfying the desired downlink receiving quality.

Abstract: Efficient paging control is achieved in a communication system that selectively provides one of communication services implemented by integrating a plurality of communication systems. Before transmitting a downlink signal to a terminal, a gateway requests each of the communication systems to transmit a paging signal to the terminal. Receiving the paging signals transmitted from the communication systems, the terminal selects a communication system A with the lowest communication cost in accordance with communication cost information contained in the paging signal. The terminal sends a request for connection to the selected communication system A. As a result, the communication system A transmits the downlink signal to the terminal.

Abstract: The mobile station visiting a location registration area at the present time plans to move to another location registration area at a future time. The mobile station sends the moving schedule information to the location management agent in a prescribed format to notify it of the scheduled destination. Receiving the moving schedule information, the location management agent learns the location registration area corresponding to the scheduled destination among the plurality of location registration areas. The location management agent sets a moving schedule flag in the location registration database in accordance with the moving schedule information with that format, which is received from the mobile station, and makes an additional registration of the moving time and the destination location registration area. Then, at the future time, it updates the location registration database, thereby making a new location registration.

Abstract: A retransmission control method is provided. In the method, each of the base stations 2-1-2-3 performs error judgment for a signal sent from a mobile station 1. Then, the base stations 2-1 and 2-3 sends results of error judgment to the base station 2-2 which is a communication partner of the mobile station 1. The base station 2-2 sends NACK for requesting retransmission to the mobile station 1 only when every result of error judgment of the base stations 2-1-2-3 indicates that there is an error.

Abstract: Base station generates a mobile station identifier which indicates a mobile station that a data signal is addressed thereto, and a head slot having a data signal when there is a data signal that has a length to be able to transmitted using one slot of a TDMA radio channel. When there is a data signal that has a length to be not able to transmitted using one slot, base station generates a head slot and continuous slots which contain at least a part of data signal. Base station transmits the head slot by using the starting slot which located at predetermined position every mobile station on the TDMA radio channel, and transmits the continuous slots by using slots which follow the starting slot. Mobile station receives the starting slot, and stops reception if the starting slot is not the head slot. If the starting slot is the head slot, the mobile station judges the mobile station identifier.