摘要:
A router includes a multicast packet transmitting unit that multicasts the identifier of the router periodically, a relay determining unit that determines whether a received data packet should be relayed to a router in another segment, an order determining unit that determines, on the basis of information included in multicast packets from the other routers, the router to which the data packet shall be transferred, and a packet relaying unit that, when the data packet is not relayed, notifies the transmission source which transmitted the packet as to the router selected by the order determining unit to be the relay destination and then transfers the data packet to the selected router. A router suitable for relaying the packet is thus selected. Since switching of the relay router may be performed by following the router redirection message, it is unnecessary to add a new function to a terminal.
摘要:
In a picture coding apparatus, a picture reproducing section is prepared at the latter part of the picture coding apparatus, detection of noise existing in a reproduced picture and selection of an appropriate filter to correct the reproduced picture according to characteristics of noise are carried out by comparing the input picture and the reproduced picture and information concerning a picture and information concerning a filter are multiplexed to transmit. And in a picture decoding apparatus, the information concerning the picture and the information concerning the filter are extracted from input signals, a picture is reproduced from the information concerning the picture and the filter to correction process to the reproduced picture is switched according to the information concerning filter.
摘要:
When first mobile router, which has a MNP, generates a key which corresponds to that MNP and transmits a registration request packet including the key to home agent, home agent stores the MNP and key of the first mobile router, and sends main mobile router registration approval. When first mobile router receives this response, it distributes the MNP and key to second mobile router in moving network. Second mobile router, which receives this, transmits a registration request packet including the MNP and key to home agent, and thereby, home agent registers second mobile router as a subsidiary mobile router. By this means, it is possible to prevent illegal acquirement of a packet addressed to a moving network by use of a mobile router which shares the network prefix (MNP).
摘要:
When the routing function of router becomes disabled, a routing stop message is multicast to all terminals and another router in a LAN. If another router can provide the routing function, a routing start message is multicast to all terminals and the other router in the LAN. This method allows the terminals in the LAN to switch the default router at a predetermined timing according to both messages, thus minimizing the default router switching delay time and the packet loss.
摘要:
In a home agent device, a message reception unit receives a request of deleting a registration of a mobile router device which has become in a non-connection state, a binding cache registration deletion reception unit judges that it is for deleting a mobile router device which is not a transmission source, and if a mobile router device of the transmission source has the authority of deleting the registration of the target mobile router device, a proxy deletion reception judgment unit deletes the registration of the requested mobile router, therefore, it can be prevented that packets are transmitted to the mobile router device which has become in the non-connection state.
摘要:
When connected to an external network, a mobile router checks an address 0table if a home address is allocated. If it is not allocated, the mobile router derives the address of a position management server from a position-management-server address table and sends an allocation request message to the position management server. The position management server receives an address management table listing addresses to be allocated to each mobile network and the allocation request message sent from the mobile router, searches the address management table for an unused address, and sends an allocation permission message to the mobile router to automatically allocate a home address to the mobile router.
摘要:
A router device includes a lower-layer information acquisition section for acquiring connection information of whether or not connected with a base station in an external network from a lower layer, and a route judgment section for transferring the received packet to the base station in the case of being connected with the base station and judging a transfer destination by looking up a routing table in the case of not being connected with the base station, when receiving a packet destined for a terminal in an external network from a radio terminal device in a same local network. Because the received packet is transferred to the base station during connection with the base station, the packet can be transferred to the external via the router intended by the terminal. Furthermore, the load in the local network can be reduced.
摘要:
A mobile communication method includes: a step for transmitting a binding update message for notification of a care-of-address of the network where the mobile network has gone, from a mobile router to a home agent, which can be used after the network has moved; and a step performed upon reception of the binding update message, for notification by the home agent of routing information concerning the route to the mobile network managed by the mobile router to the home network. Thus, the routing information from a mobile node is given to a gateway and the router on the home network without delay after movement, and it is possible to prevent loss of data sent to the mobile node belonging to the network to which the mobile network is connected after the movement.
摘要:
When connected to an external network, a mobile router checks an address 0table if a home address is allocated. If it is not allocated, the mobile router derives the address of a position management server from a position-management-server address table and sends an allocation request message to the position management server. The position management server receives an address management table listing addresses to be allocated to each mobile network and the allocation request message sent from the mobile router, searches the address management table for an unused address, and sends an allocation permission message to the mobile router to automatically allocate a home address to the mobile router.
摘要:
Provided are a service-type recording section for recording a characteristic of a service to be utilized by the mobile communication device and an interface recording section for recording an externally-connecting interface type of within a network and a characteristic thereof. The interface decision section selects at least one or more of interfaces satisfying a service request and notifies it to a mobile router possessing an externally-connecting interface. Due to this, in case there is a link status change in the external interface of the mobile router, the mobile communication device is allowed to swiftly switch the external interface and continue communication. Moreover, congestion can be avoided from occurring in communication between the mobile communication device and the mobile router during switchover.