JP2008177985A - Mobile terminal and packet transmission processing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To utilize not Mobile IPv6 communication but ordinary IPv6 communication depending on a transmission packet destination and a kind by simple setting when transmitting a packet from a Mobile IPv6 terminal. <P>SOLUTION: A selection list indicating whether a home address or a care-of address should be selected for each destination or for each kind of packet communication is set and a user sets contents of a selection list, so that the home address or the care-of address is selected as a transmission source address of a packet to be transmitted at each destination or at each kind of packet communication. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a technique for transmitting packets of audio, video, data, and the like. In particular, it relates to packet transmission by Mobile IPv6 communication.

  Network configurations for carrying out IP communication are diversified, detailed packet filters and QoS (Quality of Service) are indispensable, and packet transmission processing formats are becoming more diversified. In such a situation, when performing IP communication with a mobile terminal, it is required that communication can be maintained without interruption even if the network segment of the connection destination changes as the terminal moves. In order to satisfy these requirements, Mobile IPv6 standardization has been promoted.

  In Mobile IPv6, a Mobile IPv6 terminal acquires an IP address at its destination and is assigned a unique home address (Home Address). The IP address acquired at the destination is called a care-of address. In addition, a node called a home agent (HA) that manages the correspondence between the home address and care-of address of each Mobile IPv6 terminal is provided in the network. When the Mobile IPv6 terminal obtains a new care-of address at the destination, it registers the location information with the home agent, uses the home address as the source address of the packet sent to other terminals, encapsulates the packet, and sends it to the home agent. Send. When the home agent receives the encapsulated packet, it decapsulates the packet and transfers the packet inside to the destination terminal. A packet having a home address as a destination address from an external terminal is once received by the home agent, encapsulated into a packet having a care-of address as the destination address, and transferred to the Mobile IPv6 terminal.

  Thus, in Mobile IPv6, all packets transmitted from Mobile IPv6 terminals are transferred via the home agent. For this reason, the following problems arise.

  The first problem is that Mobile IPv6 communication processing load increases. The reason is that, even for destination terminals that do not require Mobile IPv6 communication, it is necessary to perform Mobile IPv6 communication processing with a higher load than normal IPv6 communication, which increases the unnecessary processing load on Mobile IPv6 terminals. Because.

  The second problem is that, in order to perform Mobile IPv6 communication, it is necessary to send a packet to the home agent, which increases the load on unnecessary HA. The reason is that after performing location registration between the Mobile IPv6 terminal and the home agent, the Mobile IPv6 terminal performs Mobile IPv6 communication even if it is a packet that may be normal IPv6 communication. . Therefore, communication is always performed to the home agent, and Mobile IPv6 processing is required at the home agent, which increases unnecessary load.

  The third problem is that the number of packets to be transmitted to the home agent increases, so that the packets are concentrated on the network where the home agent exists and the network load is increased.

  The fourth problem is that in normal IPv6 communication, even if the Mobile IPv6 terminal and the destination terminal are reachable, there may be no reachability between the home agent and the destination terminal. This means that communication cannot be performed between the Mobile IPv6 terminal and the destination terminal.

  As a technique for solving at least a part of such problems, Patent Document 1 provides a foreign agent device FA in a destination network, and when the mobile terminal and the destination terminal exist in the same network, It is disclosed that a source address of a packet transmitted from a terminal is converted into a care-of address and transferred. Patent Document 2 also describes that an external agent provided in a destination network replaces a source address from a mobile terminal from a home address to a care-of address, and further in paragraph 92 of Patent Document 2. Discloses that the terminal itself can modify the source address instead of the foreign agent.

JP 2003-087173 A Special table 2003-521137 gazette

  However, in the technique described in Patent Document 1, IP communication is possible only in the network to which the mobile terminal is moved without intervention of the home agent. However, in order to communicate with a terminal in another network, the home agent Intervention is required. Further, in the technique described in Patent Document 2, in order to convert the source address of a packet from a mobile terminal into a care-of address, a process of configuring a service quality session is required before that.

  The present invention solves the above problems and provides a mobile terminal and a packet transmission processing method capable of performing normal IPv6 communication instead of Mobile IPv6 communication depending on the destination of the transmission packet and the type of packet more flexibly. Objective.

  The mobile terminal of the present invention comprises means for transmitting a packet from the destination network. This means for transmitting registers the care-of address assigned in the destination network with a home agent in the network, and registers the home agent. In a mobile terminal including address processing means that uses a home address uniquely assigned in advance as a source address of a packet so that the packet is forwarded to a destination terminal via the address processing means, the address processing means includes: The care-of address can be selected as the source address of the packet so that it can be sent to the destination terminal without going through the agent, and the address processing means should select the home address or the care-of address. Selection list shown for each destination or type of packet communication Doo is provided, characterized by comprising setting means for setting the contents of the selection list users.

  In the selection list, a destination address and a packet type to be transmitted to the destination address are set.

  If the mobile terminal has a plurality of interfaces with the network, a selection list is provided for each interface.

  According to the packet transmission processing method of the present invention, a home address uniquely assigned to a mobile terminal in advance and a care-of address assigned to the mobile terminal by a destination network are managed by a home agent in the network and transmitted from the mobile terminal. In the packet transmission processing method for transferring the packet to the destination terminal via the home agent when the source address of the packet to be transmitted is the home address, the mobile terminal sends a home for each destination or type of packet communication. A selection list indicating whether to select an address or a care-of address is provided, and the contents of this selection list are set by the user so that the source address of the packet to be transmitted is set for each destination or type of packet communication. Select your home address or care-of address. A packet whose source address is a care-of address is transferred directly to the destination terminal without going through the home agent.

  In the present invention, in a mobile terminal compatible with Mobile IPv6, after completion of location registration with a home agent, mobile IPv6 communication using a home address as a source address in communication with a destination terminal or a care-of address as a source address Build a list that can be configured to use IPv6 communication using, and select whether to perform communication via the home agent or normal IPv6 communication at the time of transmission based on the list. As a result, IPv6 communication using a care-of address as a source address on Mobile IPv6 communication using a home agent as a source address is also possible, reducing unnecessary packet processing and enabling more diverse communications. In addition, since unnecessary processing is eliminated, the load on the system is reduced and efficient communication becomes possible.

  FIG. 1 shows a configuration example of a network implementing the present invention.

  The mobile terminal 11 is a Mobile IPv6 terminal, and communicates with the home agent 13 in the network to register location information. The home agent 13 manages a home address uniquely assigned in advance to the mobile terminal 11 and a care-of address assigned by the router 12 in the network to which the mobile terminal 11 is moved. After the location registration with the home agent 13, the mobile terminal 11 normally processes the communication with the destination terminal 14 as Mobile IPv6 communication via the home agent using the home address as the source address. A packet having the source address as the home address is transferred to the home agent 13 via the router 12 and then transferred to the destination terminal 14.

  In the present invention, the mobile terminal 11 is provided with a care-of address selection list indicating which of the home address and care-of address should be selected for each destination or type of packet communication. Is set, the home address or care-of address can be selected as the source address of the packet to be transmitted for each destination or type of packet communication. A packet whose source address is a care-of address is directly transferred to the destination terminal 14 without going through the home agent 13.

  According to the present invention, IPv6 communication is reachable, but when connecting via a home agent using Mobile IPv6 communication, even when a terminal exists in a network that does not have reachability, the source address is set as a care-of address. By doing so, it is possible to change to normal IPv6 communication. As a result, reachability to the destination terminal can be ensured in the Mobile IPv6 terminal.

  In addition, since terminals that do not need to perform Mobile IPv6 communication can be set in advance, there is no need to perform unnecessary Mobile IPv6 communication, and packets can be transmitted in each mobile terminal, home agent, and network where the home agent exists. Processing load is reduced.

  FIG. 2 shows an example of the functional block configuration of the mobile terminal according to the first embodiment of the present invention. The mobile terminal 11 is a means for transmitting a packet from the network of the movement destination, a packet generator 22 that receives a packet transmission request from the application 21 and generates a packet, and a packet transmitter 26 that transmits the generated packet to the network. The packet generator 22 registers the care-of address assigned in the destination network with the home agent in the network, and forwards the packet to the destination terminal via this home agent. A transmission source address selection processing unit 24 that uses a transmission source address of a packet as a home address uniquely assigned in advance, and a packet construction unit 25 are included. The source address selection processing unit 24 is configured to be able to select a care-of address as the source address of the packet so that the packet is sent to the destination terminal without going through the home agent. The packet generation unit 22 is provided with a care-of address selection list 23 for each destination or type of packet communication, and the user sets the contents of the selection list. The setting unit 27 is provided.

  FIG. 3 shows a processing flow. When the packet generation unit 22 receives 32 the packet transmission request 31 from the application 21, the transmission source address selection processing unit 24 searches the care-of address selection list 23 to specify the transmission source address when transmitting the packet 33. . If there is a destination or packet type corresponding to the care-of address selection list 23, the source address is set to the care-of address 34, and the packet construction unit 25 constructs a packet similar to a normal IPv6 packet 36. Transmit 38 the packet. If there is no corresponding item even if the care-of address selection list 23 is searched 33, the source address 35 is set as in the normal Mobile IPv6 communication, the Mobile IPv6 packet is constructed 37 in the packet construction unit 25, and the packet transmission unit The packet is transmitted from 26.

  FIG. 4 shows an example of the care-of address selection list 23. In this list, destination addresses, mask information, and packet types to be used as care-of addresses as source addresses are registered according to user settings. The packet type can be selected by the user's intention to use the care-of address or the home address by tel net or ftp.

  FIG. 5 shows an example of the functional block configuration of a mobile terminal according to the second embodiment of the present invention. The basic configuration of this embodiment is the same as that of the first embodiment, except that a plurality of interfaces with the network are provided in the terminal, and the care-of address selection list 23 is provided for each interface. The source address selection processing unit 24 determines an interface that activates Mobile IPv6, and searches the care-of address selection list 23 corresponding to the interface.

  If there are multiple interfaces with the network, the network may differ depending on the interface that activates Mobile IPv6, and the reachability to the destination terminal may change. In this embodiment, reachability can be ensured by providing a care-of address selection list for each interface. In addition, by providing a care-of address selection list for each interface, settings that are more advantageous to the user can be facilitated.

The figure which shows the structural example of the network which implements this invention. The figure which shows the structural example of the functional block of a mobile terminal. (Example 1) The figure which shows a processing flow. The figure which shows an example of a care-of address selection list. The figure which shows the structural example of the functional block of a mobile terminal. (Example 2)

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Mobile terminal 12 Router 13 Home agent 14 Destination terminal 21 Application 22 Packet generation part 23 Care-of address selection list 24 Source address selection processing part 25 Packet construction part 26 Packet transmission part 27 Setting part

Claims (4)

Comprising means for transmitting packets from the destination network;
The sending means registers the care-of address assigned in the destination network with the home agent in the network, and sends the packet source address so that the packet is transferred to the destination terminal via the home agent. In a mobile terminal including an address processing means that uses a home address uniquely assigned in advance,
The address processing means is configured to be able to select a care-of address as a source address of a packet so that the packet is sent to a destination terminal without going through the home agent,
A selection list is provided for each destination or type of packet communication indicating whether the address processing means should select a home address or a care-of address,
A mobile terminal characterized by comprising setting means for a user to set the contents of the selection list.   The mobile terminal according to claim 1, wherein a destination address and a type of packet to be transmitted to the destination address are set in the selection list.   The mobile terminal according to claim 1, wherein a plurality of interfaces with a network are provided, and the selection list is provided for each interface. A home agent in the network manages the home address uniquely assigned to the mobile terminal in advance and the care-of address assigned by the mobile terminal in the destination network,
When the source address of the packet transmitted from the mobile terminal is a home address, in the packet transmission processing method of transferring the packet to the destination terminal via the home agent,
The mobile terminal is provided with a selection list indicating whether a home address or a care-of address should be selected for each destination or type of packet communication,
A packet transmission processing method for selecting a home address or a care-of address as a transmission source address of a packet to be transmitted for each destination or type of packet communication by setting contents of the selection list by a user.

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