JP4270096B2 - Communication method with mobile terminal and mobile terminal - Google Patents

Communication method with mobile terminal and mobile terminal Download PDF

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JP4270096B2
JP4270096B2 JP2004302369A JP2004302369A JP4270096B2 JP 4270096 B2 JP4270096 B2 JP 4270096B2 JP 2004302369 A JP2004302369 A JP 2004302369A JP 2004302369 A JP2004302369 A JP 2004302369A JP 4270096 B2 JP4270096 B2 JP 4270096B2
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mobile terminal
address
network
care
hop
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JP2006115363A (en
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弘起 佐藤
正人 林
尚司 福沢
和也 門田
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株式会社日立製作所
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • H04L45/58Association of routers
    • H04L45/586Virtual routers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L29/00Arrangements, apparatus, circuits or systems, not covered by a single one of groups H04L1/00 - H04L27/00
    • H04L29/12Arrangements, apparatus, circuits or systems, not covered by a single one of groups H04L1/00 - H04L27/00 characterised by the data terminal
    • H04L29/12009Arrangements for addressing and naming in data networks
    • H04L29/12207Address allocation
    • H04L29/12311Address allocation involving portability aspects
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • H04L45/04Interdomain routing, e.g. hierarchical routing
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00Network arrangements or network protocols for addressing or naming
    • H04L61/20Address allocation
    • H04L61/2084Address allocation involving portability aspects
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02Terminal devices
    • H04W88/04Terminal devices adapted for relaying to or from another terminal or user
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W40/00Communication routing or communication path finding
    • H04W40/02Communication route or path selection, e.g. power-based or shortest path routing
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/08Access restriction or access information delivery, e.g. discovery data delivery
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W8/00Network data management
    • H04W8/26Network addressing or numbering for mobility support
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W80/00Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/04Network layer protocols, e.g. mobile IP [Internet Protocol]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W84/00Network topologies
    • H04W84/18Self-organising networks, e.g. ad-hoc networks or sensor networks

Description

  The present invention relates to a mobile data communication system, and more particularly to a technique for maintaining communication while a mobile terminal is moving between networks.

  In general, an IP network is configured by connecting a plurality of sub-networks with different IP address groups to each other, and terminals connected to the sub-network are selected from among IP address groups assigned to each sub-network. IP address is given. In general, since packets are transferred based on IP addresses within a subnetwork, a mobile terminal needs to be assigned a different IP address each time it moves to another subnetwork.

  When a mobile terminal using IPv4, which is currently widely used as an Internet communication protocol, or IPv6, which is now widely used, moves to another subnetwork, it is addressed to the IP address used in the subnetwork before the move. Since the packet reaches the sub-network before the movement, the sub-network after the movement cannot maintain the communication using the IP address used in the sub-network before the movement as it is.

  In order to solve the above-mentioned problem, a technique called Mobile IP has been proposed that enables communication to be continuously maintained even when a mobile terminal moves to another subnetwork.

  For example, in Mobile IPv6 based on IPv6, a mobile terminal defines a subnetwork to which the mobile terminal normally belongs as the home network in the subnetwork. A mobile terminal is assigned a home address as an IP address to be used in the home network, and a home agent having a function for managing the location information of the mobile terminal having the subnetwork as the home network is placed in the home network. .

  Each subnetwork is assigned a prefix of the IPv6 address as a prefix address. Each subnetwork is provided with at least one router called an advertisement router. The advertising router transmits a router advertisement (Router Advertisement) including the prefix address of the subnetwork to the mobile terminal in the subnetwork, and informs which prefix address the mobile terminal belongs to. In addition, when the mobile terminal in the subnetwork requests notification of information on the subnetwork to which it currently belongs, it responds with the above advertisement.

  Each mobile terminal moves in the destination subnetwork by obtaining the prefix address of the subnetwork from the above router advertisement and assigning the address using the IPv6 auto configuration function or DHCP (Dynamic Host Configuration Protocol). Generate a care-of address to be used in the previous subnetwork. The mobile terminal notifies the home agent device (hereinafter referred to as home agent) of the association information (binding update) between the generated care-of address and its own home address, and the home agent thereafter arrives at the home address of the mobile terminal. Captures the packet, encapsulates it, sends it to the care-of address, and the mobile terminal receives the encapsulated packet that reaches the care-of address, removes the capsule, and extracts the IPv6 packet that reaches the home address of its own terminal .

  Also, the standardization of the protocol that provides continuation of communication in a mobile network consisting of a mobile terminal with a router function (called a mobile router) and a mobile terminal that moves with the mobile router and does not have the Mobile IP function. Is being considered by the IETF NEMO (NEtwork MObility) working group.

  In addition, there is a method using an ad hoc network that performs multi-hop communication between mobile terminals in order to perform communication between the base station and a mobile terminal that is outside the wireless communication range of the base station. (For example, patent document 1).

JP 2003-230167 A

  In the above prior art, since the assignment of a care-of address to a mobile terminal that is not connected to the base station in one hop is not considered, other mobile terminals cannot send packets to the mobile terminal. This is because the mobile terminal cannot perform a binding update to the home agent, and therefore the home agent cannot transfer a packet addressed to the home address of the mobile terminal to the mobile terminal.

  Even if these mobile terminals use another network such as an ad hoc network, even if communication is possible without going through the home agent, communication performed to the home address between these mobile terminals is not possible. Because of this, there are problems such as a long communication path and an unnecessary increase in traffic.

  The present invention provides a communication method in which a care-of address is assigned to a mobile terminal that communicates with an advertising router in two or more hops (multi-hop), and the mobile terminal registers the assigned care-of address in a home agent.

  In addition, the present invention makes it possible to provide a communication path that does not pass through a home agent to a mobile terminal capable of multi-hop communication or a mobile terminal in a subnetwork that moves together with the mobile terminal.

  Specifically, in the present invention, an advertising router that also serves as a base station terminal when the mobile terminal communicates with another subnetwork or a home network transmits a router advertisement for care-of address assignment, The mobile terminal that has received the message transfers the router advertisement to another mobile terminal.

  Further, the present invention is characterized in that a redundant communication path is avoided by advertising on the ad hoc network the address assigned to the mobile terminal and the address of the network that moves together with the mobile terminal.

  More specifically, according to one aspect, a communication method according to the present invention includes a network including a mobile terminal having a communication packet transmission / reception function, a base station terminal communicating with the mobile terminal, and a home for managing the mobile terminal. In a communication system composed of agents, each base station terminal forms a subnetwork to which the terminal belongs, and a mobile terminal that can communicate with the base station terminal in one hop and a mobile terminal that cannot communicate in one hop are wireless links to each other. Is assigned to a mobile terminal that belongs to a sub-network and can communicate with one hop, and a mobile terminal that cannot communicate with one hop. The mobile terminal that forwards the communication packet addressed to the care-of address of the subnetwork and can communicate in one hop is Receiving a communication packet, characterized by transferring to the mobile terminal that can not communicate with one hop.

  Further, the base station terminal advertises the network prefix address of the sub-network, and the mobile terminal that has received the advertised network prefix address transmits the network prefix to other mobile terminals belonging to the sub-network connected by a radio link. The mobile terminal to which the address is transferred and the network prefix address is transferred generates a care-of address and registers it with the home agent.

  Furthermore, when a mobile network is connected to a mobile terminal that can communicate with one hop, the home agent transfers a communication packet addressed to the mobile terminal within the mobile network to a mobile terminal that can communicate with one hop. A mobile terminal capable of communicating in one hop transfers a communication packet to a mobile network.

  Further, the mobile terminal belonging to the sub-network is characterized by constructing a multi-hop communication path using the care-of address assigned to the mobile terminal.

  According to another aspect of the communication method of the present invention, the communication method includes a network including a mobile terminal having a communication packet transmission / reception function, a base station terminal that communicates with the mobile terminal, and a home agent that manages the mobile terminal. In a communication system, a plurality of mobile terminals belong to a sub-network formed by a base station terminal and constitute another wireless network that does not pass through the base station terminal, and a sub-network to which a home agent belongs A mobile terminal that has received a communication packet addressed to another mobile terminal as a home network transfers the communication packet without going through the home agent when the other mobile terminal belongs to another wireless network. Features.

  Furthermore, the mobile terminal advertises the home address in the home network of its own terminal to another mobile terminal belonging to another wireless network, and the other mobile terminal that has received the advertised home address If the address of the mobile terminal having the home address in the other wireless network is registered in the routing table as the transfer destination of the communication packet having the destination as the destination, and when the communication packet having the home address as the destination is received, It is characterized by forwarding to an address in the network.

  Further, when a mobile network is further connected to each of the plurality of mobile terminals that can communicate with the base station terminal, the mobile terminal that can communicate with the base station terminal is transferred from the mobile terminal in the connected mobile network to the base station terminal. When a communication packet addressed to a mobile terminal in another mobile network connected to another mobile terminal that can communicate with the station terminal is received, the communication packet is transmitted to the base station terminal without passing through the home agent in the subnetwork. The other mobile terminal that can communicate with the base station terminal that has received the forwarded communication packet is forwarded to the other mobile terminal that can communicate with the mobile station, and the communication packet addressed to the mobile terminal in the other connected mobile network It is characterized by transferring.

  Furthermore, the mobile terminal includes a wireless interface for communicating with the base station and a wireless communication interface for communicating with another wireless network, and the base station terminal advertises the network prefix address of the subnetwork and moves The terminal sets a priority for a plurality of wireless interfaces, and generates and updates a care-of address when receiving an advertised network prefix address in a network using a wireless interface with a higher priority.

  According to one aspect, a mobile terminal according to the present invention is a mobile terminal that has a communication packet transmission / reception function and belongs to a home network configured by a home agent, and is connected to a base station terminal in one hop, Connected to a mobile terminal that belongs to the sub-network and cannot communicate with the base station terminal in one hop via a wireless link, holds the care-of address of the sub-network, and is transferred from the home agent to the care-of address of the sub-network. Receiving a communication packet addressed to a mobile terminal that is connected by a wireless link and cannot communicate in one hop, and forwards the received communication packet to a mobile terminal that cannot communicate in one hop.

  In another aspect, the mobile terminal according to the present invention has a function of transmitting and receiving communication packets, belongs to a home network configured by a home agent, belongs to a subnetwork configured by a base station terminal, Configure the terminal and other wireless network that does not go through the base station terminal, receive communication packets addressed to other mobile terminals whose home network is the subnetwork to which the home agent belongs, and without going through the home agent, It is characterized in that a communication packet is transferred to another mobile terminal using another wireless network.

  According to the above aspect, even if a mobile terminal that is not connected to the base station in one hop and further connected to a network that moves together with the mobile terminal move through the subnet, the mobile terminal is aware that it belongs to the destination subnet. An address can be generated. Further, the base station and other mobile terminals on the route to the mobile terminal that generated the care-of address can construct a route addressed to the care-of address, and the mobile terminal that generated the care-of address Since binding update can be performed on the agent, it is possible to communicate without changing the IP address.

  Further, by using another network such as an ad hoc network, communication can be performed without going through the home agent, so that the communication path can be shortened and traffic can be reduced.

  According to the present invention, a mobile terminal that is not connected to a base station in one hop can also communicate using a care-of address. In addition, the communication path can be shortened to prevent an increase in traffic.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing an embodiment of a wireless mobile communication method of the present invention. Base station terminal 106, base station terminal 107 and terminal 108 are connected to network 109, and belong to different sub-networks.

  The base station terminal 106 and the base station terminal 107 are gateways (routers) for the wireless network and the network 109. Specifically, the base station terminal 106 is an access point of the wireless LAN network 110 provided with a wireless LAN interface, and the base station terminal 107 is a public mobile radio network (hereinafter referred to as cellular network) that performs communication via the base station. Network 111).

  The mobile terminals 101 to 105 have both a wireless LAN interface and a cellular network interface.

  An example of the hardware configuration of the terminals 101 to 107 is shown in FIG. Each terminal includes a timer B01, a CPU B02, a memory B03, a wireless LAN interface B04, a cellular network interface B05, and a wired LAN interface B06. The mobile terminals 101 to 105 can transfer packets using the wireless LAN interface B04, the cellular network interface B05, and the wired LAN interface B06.

  The mobile terminals 101 to 105 may not include the wired LAN interface B06, the base station terminal 106 may not include the cellular network interface B05, and the base station terminal 107 may not include the wireless LAN interface B04. .

  The processing of each terminal in the following description is realized by the CPU B02 executing a program stored in the memory B03. The program may be stored in advance in the memory B03, or a removable storage medium or communication medium that can be used by the terminal (wired, wireless, optical, etc. network, carrier wave or digital on the network) Signal) may be introduced into the memory B03 as required.

  Hereinafter, when referring to both mobile terminals and base station terminals, they are simply referred to as terminals.

  The mobile terminal 101 is in a position where it can communicate with the mobile terminal 102 using the wireless LAN interface B04, and the mobile terminal 102 is in a position where it can communicate with the mobile terminal 101, the mobile terminal 103, and the base station terminal 106 using the wireless LAN interface B04. The mobile terminal 103 can communicate with the mobile terminal 102 using the wireless LAN interface B04, and can communicate with the base station terminal 107 using the cellular network interface B05.

  The mobile terminals 104 and 105 can communicate with each other using the wireless LAN interface B04, and are in a position where they can communicate with the base station terminal 107 through the cellular network interface B05.

  The mobile terminals 101 to 105 and the base station terminal 106 have an ad hoc network path control function that autonomously establishes a communication path on the wireless network, and configure an ad hoc network using the wireless LAN interface B04. As a routing protocol of the ad hoc network routing software, a protocol that is being discussed for standardization in the Internet Engineering Task Force (IETF) can be used as a routing protocol for the ad hoc network.

  If the terminals 101 to 106 form a wireless link with the terminals existing in the communication area of the wireless LAN interface B04 of each other, and the mobile terminals 101 to 105 can communicate with the cellular network interface B05 of the base station terminal 107, A radio link is formed with the base station terminal 107.

  In FIG. 1, mobile terminals 101 to 103 constitute a subnetwork 110 using a base station terminal 106 and a wireless LAN interface B04, and mobile terminals 103 to 105 constitute a cellular network interface B05 formed by the base station terminal 107. Belongs to the subnetwork used. Further, the mobile terminals 104 and 105 form a wireless link using the wireless LAN interface B04.

  Mobile terminals 101 to 105 are assigned home addresses with the terminal 108 as a home agent device (hereinafter referred to as HA 108) and the subnetwork 112 to which the HA 108 belongs as a home network. When connecting to the network 109 to which the base station terminal 106 or the base station terminal 107 belongs, the mobile terminals 101 to 105 set the care-of address belonging to the network 109 to each terminal as an interface care-of address.

  The mobile terminals 101 to 105 register one of the interface care-of addresses set for each terminal in the HA 108 as a terminal care-of address, as will be described later. Hereinafter, when both the interface care-of address and the terminal care-of address are indicated, they are simply referred to as care-of addresses.

  The terminals 101 to 106 may set an ad hoc routing address in the wireless LAN interface B04 as a routing address constituting the ad hoc network, or may use an interface care-of address assigned to the wireless LAN interface B04. In addition, it is assumed that the address used in the present embodiment is an IPv6 address, and an ad hoc network routing address is allocated to the wireless LAN interface B04.

  Next, a care-of address setting method according to the present embodiment will be described. The address autoconfiguration method is described in technical document RFC2462 (S. Thomson, T. Narten, “IPv6 Stateless Address Autoconfiguration”, 1998/12, <http://www.ietf.org/rfc/rfc2462) published by IFTF. .txt>).

  The base station terminal 106 and the base station terminal 107 also serve as advertising routers and advertise router advertisements storing information such as network prefixes related to the wireless LAN network 110 and the cellular network 111 to which the terminal belongs.

  Router advertisement is a technical document RFC2461 (T. Narten, E. Nordmark, W. Simpson, “Neighbor Discovery for IP Version 6 (IPv6)”, 1998/12, <http: //www.ietf. org / rfc / rfc2461.txt>) is transmitted using a kind of router advertisement (Router Advertisement) of the ICMP packet.

  The mobile terminals 101 to 105 set the care-of address based on the network prefix information included in the received router advertisement and the interface identifier given to the mobile terminal. The interface identifier may be set manually or RFC2373 (R. Hinden, S. Deering, “IP Version 6 Addressing Architecture”, 1998/7, <http://www.ietf.org/rfc/rfc2373.txt >) May be set based on the MAC address of the interface. A valid time included in the router advertisement is set for the care-of address, and the care-of address after the valid time has passed is not used because it is not valid.

  In this embodiment, the mobile terminal 102 receives the router advertisement advertised by the base station terminal 106, sets a care-of address, and forwards the router advertisement storing the same network information as the router advertisement to the mobile terminal 101 and the mobile terminal 103. To do.

  The transfer is realized by broadcast transmission or multicast transmission of the router advertisement received by the mobile terminal 102 from the base station terminal 106 again. The mobile terminals 101 and 103 that have received the router advertisement transferred from the mobile terminal 102 further transfer the router advertisement.

  When the router advertisement transferred by the mobile terminals 101 and 103 returns to the mobile terminal 102, a loop may occur, resulting in useless traffic. In order to prevent this, the base station terminal 106 may add a router advertisement with an ID number that identifies the router advertisement. Specifically, the router advertisement defined in RFC2461 storing the network information may be expanded, and an ID number (202) for identifying the router advertisement may be added to the router advertisement unit (201).

  The mobile terminal 102 records the source address and ID number of the terminal 106 contained in the IP header of the received router advertisement in the router advertisement reception list, and advertises the address of the terminal 106 that is the source of the router advertisement for forwarding. Broadcast transmission as the router address.

  An example of the router advertisement reception list is shown in FIG. A column 301 registers the sender address, a column 302 ID number of the received router advertisement, and a column 303 registers the network information contained in the router advertisement.

  A router advertisement transfer algorithm will be described with reference to the flowchart of FIG. When the router advertisement is received (401), it is checked whether the received interface is an interface constituting the ad hoc network (in this embodiment, a wireless LAN interface) (402), and if not received by the interface constituting the ad hoc network ( In 402, no) router advertisement reception processing (406) is performed.

  If it is received by the interface constituting the ad hoc network (Yes in 402), it is checked whether there is a pair in the router advertisement reception list that matches the router advertisement source address and ID number (403). If there is a matching pair (yes in 403), exit without doing anything. If there is no matching pair (No in 403), router advertisement transfer (404) with TTL subtracted by 1 is performed by broadcast transmission or multicast transmission, and the source address and ID number are registered in the router advertisement reception list (405) Then, router advertisement reception processing (406) is performed.

  With the algorithm shown in FIG. 4, the mobile terminal 102 that has received the router advertisement from the base station terminal 106 transfers the router advertisement to another terminal with which a radio link has been established. The mobile terminals 101 and 103 receive the router advertisement transferred from the mobile terminal 102 and set the care-of address. The mobile terminal 103 also receives the router advertisement transmitted from the base station terminal 107.

  In order to determine which network the mobile terminal 103 belongs to which terminal care-of address belongs to, the priority is set for the communication interface of the mobile terminal, and the interface care-of address of the interface with the higher priority is set to the mobile terminal care-of address. There is a method of using an address.

  FIG. 5 shows a flowchart of the router advertisement reception process shown in step 406 of FIG. When the mobile terminal receives the router advertisement, the mobile terminal sets (501) as the care-of address of the reception interface by the method shown in RFC2462, and checks whether there is an interface care-of address having a higher priority than the received interface in the care-of address list (502). If there is an interface care-of address with a high priority (yes in 502), the process is terminated. If not (No in 502), check if there is an interface care-of address with the same priority in the care-of address list (503), and if yes (yes in 503), the TTL value of the received router advertisement and the TTL of the above interface care-of address The values are compared (504), and if the TTL value of the received router advertisement is small (Yes in 504), the process is terminated.

  If the TTL value is large (no in 504) or the interface care-of address with the same priority is not in the care-of address list (no in 503), check if there is a route to the advertising router (505) and if there is a route ( (Yes in 505) The care-of address of the mobile terminal is updated (506).

  In this embodiment, assuming that the priority of the wireless LAN interface B04 (priority 1) is higher than that of the cellular network interface B05 (priority 2), the mobile terminal 103 transfers the router transferred by the mobile terminal 102. Set the care-of address based on the network information included in the advertisement. The mobile terminal 104 and the mobile terminal 105 set a care-of address based on the router advertisement transmitted by the base station terminal 107.

  Check the existence of the route to the advertising router. When a direct radio link is configured with a base station terminal as in a cellular system, confirm that the radio link is established, and use a multi-hop link as in an ad hoc network. The establishment is performed by confirming that the advertising router exists in the routing table or by confirming communication with the advertising router using ping.

  An example of the care-of address list provided in each mobile terminal is shown in FIG. An interface care-of address is registered in a column 601, and an effective time of the interface care-of address is registered in a column 602. In the column 603, the priority of the interface is registered. In the column 604, the interface care-of address of which interface is registered. In the column 605, the TTL of the router advertisement is registered. A row 606 shows a registration example of information of a router advertisement transmitted by the base station terminal 106, and a row 607 shows a registration example of information of the router advertisement transmitted by the base station terminal 107.

  Next, a method for establishing a communication path with a care-of address according to the present embodiment will be described with reference to the flowcharts of FIGS.

  When a new care-of address is set (701), the mobile terminal 101 checks whether the care-of address is set to an interface constituting the ad hoc network (702), and an interface (this embodiment) In the case of wireless LAN interface B04) (Yes in 702), the care-of address also advertises (703) according to the advertising method of the routing address in the ad hoc network, configures the route in the ad hoc network, and is the home agent HA108. Perform Binding Update (704) for

  The mobile terminal 102 also sets the care-of address by the above method and performs the binding update to the HA 108. When receiving the care-of address advertised by the mobile terminal 101, the mobile terminal 102 registers in the routing table and constructs a route using the care-of address.

  FIG. 8 shows an example of a routing table used by the mobile terminal 102.

  A column 801 indicates a destination and a netmask (network length), a column 802 indicates a next hop, and a column 803 indicates an interface used for transmission. A destination having a netmask of 128 indicates a host route, and a destination having a netmask of 64 indicates a network route.

  Line 804 shows the host route CoA 101/128 to the care-of address 101 (referred to as CoA) 101 of the mobile terminal, the next hop is the ad hoc network routing address (referred to as AoA) 101, and the wireless LAN interface (hereinafter referred to as WLAN) as the transmission interface. ) B04 shows an example where B04 is registered, and line 805 shows an example where a WLAN is registered as a transmission interface capable of directly communicating with the host route AoA101 / 128 to the AoA101 of the mobile terminal 101.

  Line 806 shows an example in which WLAN B04 is registered as a transmission interface for terminal 106/128, which is a host route to terminal 106. Line 807 shows an example in which WLAN B04 is registered as a transmission interface for the host route AoA103 / 128 to AoA103 of mobile terminal 103.

  Line 808 shows an example of registration of the network route CoA102 / 64 to the network to which the terminal care-of address CoA102 of the mobile terminal 102 belongs, and line 809 registers for the network route AoA102 / 64 to which the routing address AoA102 for the ad hoc network of the mobile terminal 102 belongs. An example is shown. Line 810 shows an example in which a default route is registered.

  Similarly to the above method, the terminal 106 creates a routing table so that packets addressed to the care-of address of the mobile terminal 101 are transferred to the mobile terminal 102.

  Upon receiving the Binding Update, the HA 108 encapsulates the packet addressed to the home address of the mobile terminal 101 with IP in IP addressed to the new care-of address and transfers the packet to the terminal 106. The terminal 106 refers to the above routing table and transfers the packet to the mobile terminal 102. The mobile terminal 102 also transfers the packet to the mobile terminal 101 with reference to the routing table shown in FIG.

  In addition, when the effective time of the interface care-of address with the highest priority in the care-of address list disappears, the mobile terminal sets the interface care-of address with the highest priority remaining with the effective time as the mobile terminal care-of address. The processing in this case also follows the algorithm shown in the flowchart of FIG.

  The method of advertising the routing address in the ad hoc network differs depending on the routing protocol. In this embodiment, the routing protocol shown in RFC3626 (T. Clausen, P. Jacquet, “Optimized Link State Routing Protocol (OLSR)” 2003/10, http://www.ietf.org/rfc/rfc3626.txt) Assume that OLSR (Optimized Link State Routing) is used for IPv6 by expanding the address space handled from 32 bits to 128 bits. In OLSR, when a terminal has multiple addresses, communication is made to multiple addresses of the terminal by advertising one of them as a main address and as an MID (Multiple Interface Declaration) message that defines the other address as an interface address. Build a route. By storing the care-of address of the terminal in the MID message, a communication path for the care-of address can be established.

  Next, a method in which the mobile terminals 101 to 105 communicate with each other without using the HA 108 using the ad hoc network will be described.

  The mobile terminals 101 to 105 have an ad hoc network routing address set in the wireless LAN interface B04 as a routing address constituting the ad hoc network, a terminal care-of address (if a terminal care-of address is set), and a home address. Is used as a routing address.

  As in the case of the advertisement of the terminal care-of address, by storing and advertising the home address in the MID message, the received mobile terminal can construct a communication path for the home address of the transmitted mobile terminal.

  For example, in this embodiment, the mobile terminal 104 and the mobile terminal 105 advertise the home address as one of a plurality of addresses. Therefore, the home address of the mobile terminal 105 is registered as a host route in the routing table of the mobile terminal 104.

  An example of the routing table of the mobile terminal 104 is shown in FIG. In FIG. 12, columns 801 to 803 are the same as those in FIG.

  Row C04 shows an example where the next hop is registered as AoA105 and the transmission interface is WLAN B04 for the host route HoA105 / 128 to the home address (described as HoA) 105 of the mobile terminal 105. An example in which WLAN B04 is registered as a transmission interface that can directly communicate with the host route AoA 105/128 to AoA 105 of FIG.

  Row C06 shows an example in which the next hop is AoA105 and WLAN B04 is registered as a transmission interface for the host route CoA105 / 128 of the mobile terminal 105 to the CoA105.

  Row C07 shows an example of registration for the network route CoA104 / 64 to the network to which the terminal care-of address CoA104 of the mobile terminal 104 belongs, and row C08 is registered for the network route AoA104 / 64 to the network to which the AoA104 of the mobile terminal 104 belongs. An example is shown. Line 809 shows an example in which a default route is registered.

  When transmitting a packet to the host address of the mobile terminal 105, the mobile terminal 104 scans the routing table shown in FIG. 12, and transmits the packet from the most appropriate interface. In other words, since the home address of the mobile terminal 105 is registered in the row C04 of the routing table, a packet addressed to the home address of the mobile terminal 105 is transmitted from the wireless LAN interface B04 to the ad hoc network routing address and does not pass through the HA 108. The mobile terminal 105 is reached.

  Next, in the present embodiment, a case where there is a mobile network that moves together with a mobile terminal, and the mobile terminal is a mobile router having a router function between the mobile network and an external network will be described with reference to FIG. A configuration example of the mobile router is the same as that shown in FIG.

  Mobile terminals 901 to 905 are mobile routers 901 to 905, to which mobile networks 906 to 910 are connected, respectively. The network prefix of the mobile network is set in advance.

  In this embodiment, the mobile router uses a wired LAN interface B06 to connect to the mobile network via a wired LAN. The connection method between the mobile router and the mobile network is not limited to the wired LAN as long as the mobile terminal in the mobile network can communicate with the mobile router.

  When the mobile terminal is a mobile router, the HA 108 manages the network prefix of the mobile network connected to the mobile router in addition to the home address and the terminal care-of address. The network prefix of the mobile network may be transmitted to the HA 108 in addition to the terminal care-of address at the time of Binding Update shown in the flowchart 704 of FIG. 7, or may be registered in the HA 108 in advance.

  In this embodiment, for example, when a packet is transmitted from a mobile terminal in the mobile network 906 to a mobile terminal in the mobile network 910, the mobile router 901 forwards the packet to the HA. In order to transfer to the mobile network 910, the HA 108 encapsulates IP in IP and transfers the packet to the mobile router 905. The mobile router 905 releases the encapsulation and transfers the packet to the mobile network 910.

  A packet transmitted from a mobile terminal in the mobile network 909 to a mobile terminal in the mobile network 910 reaches the mobile network 910 through a route via the HA 108 in the conventional method. As shown below, the mobile terminal in the mobile network 910 is reached via the ad hoc network configured between the mobile routers 904 and 905 without passing through the HA 108.

  OLSR uses a Host and Network Association (HNA) message to build a route on an ad hoc network when a mobile terminal is a router (gateway) to a network. Store and advertise the network address. In this embodiment, the mobile routers 904 and 905 advertise the network prefixes of the mobile networks 909 and 910 connected to the respective mobile routers as HNA messages.

  FIG. 10 is an example of the routing table of the mobile router 904 that has received the advertised network prefix. In the routing table of FIG. 8, the route A01 and the mobile to the network prefix (denoted MoA) 910/64 of the mobile network 910 are shown. A route A02 to MoA909 / 64 of network 909 is added. It is assumed that a wired LAN interface (referred to as eth0) is used for connection to the mobile network 909.

  When receiving a packet transmitted from a mobile terminal in the mobile network 909 to a node in the mobile network 910, the mobile router 904 checks the routing table shown in FIG. In order to deliver the packet to the mobile network 910, the packet is transferred to the ad hoc network routing address AoA 905 of the mobile router 905, and the mobile router 905 transfers the transferred packet to the mobile network 910.

  As described above, communication between mobile networks that does not pass through the HA 108 becomes possible.

It is a figure which shows an example of a structure of the mobile terminal network in embodiment. It is a figure which shows an example of the format of the router advertisement in embodiment. It is a figure which shows an example of the router advertisement receiving list in the embodiment. It is a flowchart which shows an example of the router advertisement transfer process in an embodiment. It is a flowchart which shows an example of the router advertisement reception process in an embodiment. It is a figure which shows an example of the care-of address list with which a mobile terminal is provided in embodiment. It is a flowchart which shows an example of the change process of a mobile terminal care-of address in embodiment. It is a figure which shows an example of the routing table of a mobile terminal in embodiment. It is a figure which shows an example of a structure of the mobile router network in embodiment. It is a figure which shows an example of the routing table of a mobile router in embodiment. It is an example of hardware constitutions of each terminal in an embodiment. It is a figure which shows another example of the routing table of a mobile terminal in embodiment.

Explanation of symbols

101, 102, 103, 104, 105: mobile terminal, 106, 107: base station terminal, 108: home agent, 109: network, 110: wireless LAN network, 111: cellular network, 901, 902, 903, 904, 905 : Mobile router, 906, 907, 908, 909, 910: Mobile network.

Claims (6)

  1. A communication method with a mobile terminal in a communication system including a mobile terminal having a wireless communication packet transmission / reception function, a base station terminal that performs wireless communication with the mobile terminal, and a home agent that manages the mobile terminal There,
    Wherein the base station terminal, capable of wireless communication with the mobile terminal by the base station terminal and one hop, the mobile terminal that can not wirelessly communicate with the base station terminal and one hop, constituting the network, the first sub-network Belong to
    The mobile terminal that cannot wirelessly communicate with one hop has a second subnetwork different from the first subnetwork as a home network, and a wireless link is established with the mobile terminal that can wirelessly communicate with the one hop. If
    Assigning a care-of address in the first sub-network corresponding to the home address of the mobile terminal and the address in the wireless link to the mobile terminal that cannot wirelessly communicate in the one hop,
    The home agent that manages the mobile terminal that cannot perform wireless communication in one hop, the base station terminal that uses the care-of address of the mobile terminal as a destination for communication packets addressed to the home address of the mobile terminal that cannot perform wireless communication in one hop. Forward to
    The base station terminal forwards the received communication packet destined for the care-of address to the mobile terminal capable of wireless communication with the one hop,
    The mobile terminal capable of wireless communication with the one hop forwards the communication packet destined for the received care- of address to the address on the wireless link of the mobile terminal that cannot wirelessly communicate with the one hop via the wireless link. A communication method with a mobile terminal .
  2. In the communication method with the mobile terminal according to claim 1,
    The base station terminal advertises a network prefix address of the first subnetwork;
    The mobile terminal capable of wireless communication with the one hop having received the advertised network prefix address,
    Transferring the network prefix address to a mobile terminal that is connected by the wireless link and belongs to the first sub-network and cannot perform wireless communication in one hop ,
    The mobile terminal that is not able to perform wireless communication with the one hop transferred the network prefix address generates the care-of address,
    A method for communicating with a mobile terminal, wherein the method registers with the home agent.
  3. In the communication method with the mobile terminal according to claim 1,
    When a mobile network is further connected to the mobile terminal capable of communication in the one hop,
    The home agent forwards a communication packet addressed to a mobile terminal in the mobile network to the mobile terminal capable of communication in the one hop,
    The communicable mobile terminals 1 hop, the transferred the communication packet, the communication method of the mobile terminal, characterized by transferring to the mobile network.
  4. In the communication method with the mobile terminal according to claim 2 ,
    If the mobile terminal that can not wirelessly communicate in one hop further belongs to a third subnetwork, assign a care-of address in the third subnetwork corresponding to the home address of the mobile terminal,
    The assigned care-of address of the mobile terminal that cannot perform wireless communication in one hop, the communication interface using the care-of address, and the priority of the communication interface are associated and managed,
    A mobile terminal that registers a care-of address having a higher priority of a corresponding communication interface among the care-of addresses assigned to the mobile terminal that cannot wirelessly communicate in one hop with the home agent ; method of communication.
  5. A mobile terminal having a wireless communication packet transmission / reception function and belonging to the first subnetwork ,
    Can not communicate with a group Chikyoku terminal and one hop, the a home network different from the second subnetwork to the first subnetwork, other mobile terminal the radio link is established between the mobile terminal , Belonging to the first sub-network ,
    Holding a routing table indicating a care-of address in the first sub-network corresponding to a home address in the second sub-network assigned to the other mobile terminal and an address in the radio link ;
    Wherein Ru is transferred from another home agent that manages the mobile terminal receives a communication packet destined to the care-of address in the first sub-network of said other mobile terminal,
    A mobile terminal , wherein the received communication packet destined for the care-of address is transferred to the other mobile terminal via the wireless link with reference to the routing table .
  6. In the mobile terminal according to claim 5,
    The mobile terminal
    Receiving the network prefix address of the first sub-network advertised by the base station terminal;
    Transferring the network prefix address to the other mobile terminals belonging to the first sub-network connected by the wireless link;
    Obtain the care-of address in the first sub-network generated by the other mobile terminal based on the transferred network prefix address
    A mobile terminal characterized by that.
JP2004302369A 2004-10-18 2004-10-18 Communication method with mobile terminal and mobile terminal Expired - Fee Related JP4270096B2 (en)

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PCT/JP2005/019028 WO2006043503A1 (en) 2004-10-18 2005-10-17 Communication system for mobile body

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