JPH1023068A - Mobile communication method and mobile communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute IP(internet protocol) mobile communication, without mounting a Mobile IP protocol by substitutionally answering a conversion result at the time of receiving a conversion request from a logical address to a physical address. SOLUTION: A position information-storing part 12 holds the correspondence of a MAC address with a telephone number, executes conversion from the MAC address obtained by an address-converting part to the telephone number and obtains present position information of a terminal which is indicated by the telephone number from the telephone number. A substitute answering part 14 extracts ARP(address resolution protocol) Request from broadcast-type packets which are fetched from a network driver part 19, refers to ARP information (the corresponding of an IP address and the MAC(multiplied analog component) address) held by an address corresponding-holding part 16 and transmits requested ARP information to the transmission source IP address of ARP Request as ARP Respons. Thus, address conversion is executed at the time of the conversion request from the logical address to the physical address, and its result is transmitted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a network having a mobility management function at a link level, such as a telephone exchange system or a wireless LAN system, or an IP terminal connected to a network, which moves to a different subnetwork area. The present invention relates to a method and an apparatus that enable IP communication to be continued even when the communication is performed.

[0002]

2. Description of the Related Art The international standardization organization IETF (Int)
ernet EngineeringTask For
In ce), even if an IP (Internet Protocol) terminal moves between networks having different network addresses, a Mobile for realizing the continuation of the IP communication without noticing the application program.
e A proposal for standardization of the IP protocol is under discussion.

[0003] However, this Mobile IP protocol does not consider the case where mobile communication is supported in a layer lower than the IP layer, and assumes that the lower layer supports broadcast. In a normal LAN environment, the lower layer of the IP is a transmission path that does not support mobile communication such as Ethernet that supports broadcast.

[0004] As a lower layer of the IP layer, a public wireless telephone network used in cellular telephones and PHS telephones,
Assuming a local wireless telephone network such as a PHS, a local wireless LAN that supports roaming, and the like, it is redundant that both Mobile IP, which is mobility management in the IP layer, and mobility management in a lower layer that supports mobility work. There is a problem that resources and CPU resources are wasted.

[0005] However, IP terminals that do not implement the Mobile IP protocol rely solely on lower-layer mobility management functions such as a wireless telephone network that supports mobility.
IP mobile communication cannot be realized due to the following problems.

FIG. 6 shows that, when the wireless telephone network is divided into several IP subnets, even if an IP terminal device that does not implement the Mobile IP protocol attempts to move between different IP subnets on the wireless telephone network. This shows that communication cannot be continued normally.

In FIG. 6, BS1 to BS3 are base stations for controlling radio waves in a wireless area, BS1 constitutes a wireless area A, BS2 constitutes a wireless area B, and BS3 constitutes a wireless area C. As an IP subnet,
Wireless area A has IP subnet NA, wireless area B
Is assigned an IP subnet NB, and the wireless area C is assigned an IP subnet NC. IP subnet NA and subnet that is the backbone of NB and NC
Let it be X. That is, each of the BSs 1 to 3 is a base station that performs wireless control, and at the same time, is configured to operate as an IP router. The terminals A1 and A2 are assigned IP addresses belonging to the IP subnet NA, and the terminals B1 and B2
2 is assigned an IP address belonging to the IP subnet NB, and terminals C1 and C2 are assigned an IP address belonging to the IP subnet NC. All terminals A1,
A2, B1, B2, C1, C2 can be connected to BS1 or 2, 3 in all wireless areas A, B, C.

Normally, telephone line connection involves specifying a partner terminal by a telephone number and establishing a line with the partner terminal.
However, transmission and reception of an IP packet addressed to an arbitrary party on a telephone line cannot be realized if the line is connected to a specific party.

FIG. 7 is a block diagram of a conventional communication device. In FIG. 7, a conventional communication device 90 is connected to a LAN 96. The communication device 90 includes an upper layer 91 indicating all protocol stacks above the transport layer.
A network layer unit 92 for executing a protocol of a network layer, a network driver unit 95 for inputting and outputting data to and from the LAN 96, a routing table 93 referred to when the network layer unit 92 performs path control, And a kernel ARP information section 94 referred to in order to obtain a physical address.

[0010] Upon receiving a data transmission request, the network layer unit 92 of the conventional communication device 90 determines the physical address of the transmission destination by referring to the routing table 93 and the kernel ARP table 94 and drives the network driver unit 95. Then, data is sent out onto the LAN 96.

Referring to FIG. 6 and FIG. 7, a situation in which a conventional communication device attempts to communicate with a moving terminal device will be described.

In FIG. 6, it is assumed that IP terminal A1 has been moved from wireless area A to wireless area C. IP terminal A2
To send an IP packet to A1, first, the terminal A1
Must be converted to a MAC address. For this reason, the terminal A2 converts the IP address of the terminal A1 into a MAC address, so that the ARP (Address) is used.
ss Resolution Protocol) R
Attempt to send request. However, if the wireless telephone network does not support broadcast, the ARP Request does not reach the terminal A1, so that nobody responds, and as a result, the terminal A2 cannot communicate with the terminal A1.

If the wireless telephone network does not support broadcast, the network driver unit 95 of the communication device 90 may use the ARP
Even if the request is received, a response cannot be returned unless it has the ARP information on the terminal A1. Even if it has the ARP information, no terminal other than the terminal A1 returns a response.

A method known as proxy ARP is known in which a terminal other than the terminal A1 sends an ARP Response to the source of the ARP Request in place of the terminal A1. However, there is a problem that the administrator manually updates the correspondence between the physical address and the logical address, which is time-consuming and error-prone. (Kyoritsu Shuppan, "Network Construction by TCP / IP," p. 221)
See section 16.5 Proxy ARP).

As described above, communication with an IP terminal moving on a network having a mobility management function at a link level such as a telephone network has not been realized.

The present invention has been made in view of the above problems, and when a mobility management function is provided by a network or a network, a different IP is provided to an IP terminal without implementing the Mobile IP protocol. It is an object of the present invention to provide an IP mobile communication method and apparatus that enables communication to be continued without resetting a network environment or restarting an application program even when moving to a subnet.

[0017]

In order to solve the above problem, a mobile communication method according to claim 1 is a communication device connected to a network supporting movement at a link level, and is assigned to a terminal. An address correspondence holding unit that holds an address correspondence between a physical address and a logical address, an address conversion step of performing an address conversion from the logical address to the physical address, and a current address of a terminal specified by the physical address from the physical address. A current position acquisition step of acquiring a position, a connection step of making a link-level connection with a terminal indicated by the current position, and, if there is a translation request from a logical address to a physical address, driving the address translation step to perform the translation. And a proxy response step of sending the result to the requesting terminal.

A mobile communication method according to claim 2, wherein, if the current position acquired in the current position acquisition step is in the same area as the source terminal, the data delivery step conveys data to a target terminal in the shortcut delivery step. It is characterized by having.

The mobile communication method according to the third aspect is the first aspect.
The described location information is a paging area.

The mobile communication method according to the fourth aspect is the first aspect.
The described location information is information for identifying a base station with which the terminal can currently communicate.

According to a fifth aspect of the present invention, in the mobile communication method, the correspondence between the physical address and the logical address is a correspondence between a MAC address assigned to the terminal at the time of subscriber registration of the terminal and a telephone number. The process is I
An IP address conversion step of converting a P address to a MAC address, and an M step of converting a MAC address to a telephone number
The MAC address obtained in the IP address conversion step is further converted to the MA address.
The C address conversion step is an address conversion step of converting a telephone number into a telephone number. The address correspondence holding step is a step of communicating the correspondence between an IP address and a MAC address of a terminal (this correspondence is hereinafter referred to as ARP information) of the communication system. A kernel ARP information table registration step of registering in the kernel ARP information table held in the module, and a proxy ARP holding ARP information that cannot be registered in the ARP information table due to network inconsistency in the proxy ARP table
RP information table registration step, wherein at least ARP information of the terminal on the telephone network is registered in the kernel ARP information table or the proxy ARP information table. And a responding step of sending an ARP response to a source terminal if the received packet is an ARP request. The delivery step is an IP that delivers an IP packet to a terminal specified by a destination MAC address of an IP packet sent from the terminal.
A mobile communication method, which is a packet delivery step.

According to a sixth aspect of the present invention, in the mobile communication method, the correspondence between the physical address and the logical address corresponds to the M allocated to the terminal obtained from the terminal when the terminal is registered.
The address conversion step is a correspondence between an AC address and a telephone number, and the address conversion step includes an IP address conversion step of converting an IP address to a MAC address, and a MAC address conversion step of converting a MAC address to a telephone number. The MAC address obtained by the conversion step is an address conversion step of further converting the MAC address into a telephone number by the MAC address conversion step. The address correspondence holding step is a correspondence between the IP address of the terminal and the MAC address (this correspondence is hereinafter referred to as ARP). Kernel AR held in the communication module of the communication system.
A kernel ARP information table registration step of registering in the P information table; and a proxy ARP information table registration step of storing ARP information which cannot be registered in the ARP information table due to network inconsistency in the proxy ARP table. The ARP information of the terminal is stored in the kernel ARP information table or the proxy A
The address translation result transmission step is registered in the RP information table, and the address translation result transmission step includes a broadcast step of capturing a broadcast type Ethernet frame transmitted on a line between the terminal and the communication system, and the ARP request. And a response step of transmitting the ARP response to the transmission source terminal. The data distribution step includes the step of transmitting the IP packet to the terminal specified by the transmission destination MAC address of the IP packet transmitted from the terminal. It is a packet delivery process.

[0023]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a mobile communication device implementing the mobile communication method of the present invention. The mobile communication device includes an address conversion unit 11, a position information acquisition unit 12, an address correspondence holding unit 16, a proxy response unit between the network layer unit 92 and the network driver unit 95 in the conventional communication device 90 shown in FIG. 14 and a shortcut delivery unit 17 are added. The network driver 19 connects the mobile communication device to the telephone network 18.
It has the function of connecting to

The address correspondence holding unit 16 stores the kernel AR
It comprises a P information section 94 and a proxy ARP information section 13.
The kernel ARP information section 94 points to an ARP table implemented in the UNIX operating system, and
Shows a display example of the ARP table. Proxy ARP information section 1
3 is the ARP stored in the kernel ARP information section 94
In addition to the information, it holds ARP information that does not match the network address assigned to the mobile communication device. Note that the proxy ARP information section may also hold the ARP information held in the kernel ARP information section.

The address conversion unit 11 refers to the correspondence table between the logical address and the physical address held by the address correspondence holding unit 16, and transmits the destination of the IP (Internet Protocol) packet requested to be transmitted by the network layer unit 92. The IP address specified as the address is converted into a corresponding MAC address. The IP packet to be transmitted together with the conversion result is passed to the position information acquisition unit 12.

The location information acquisition unit 12 holds the correspondence between the MAC address and the telephone number, and converts the MAC address obtained by the address conversion unit into a telephone number. Further, the current position information of the terminal indicated by the telephone number is obtained from the telephone number. The current location information is a general call area in the case of a PHS telephone. Alternatively, the information indicates the base station to which the telephone is currently connected.

Since the location information obtaining unit 12 can obtain the location information of the destination terminal in the telephone network, the network driver 19 can efficiently transmit the data requested to be transmitted through the route in the telephone network. Send to the desired destination while selecting.

The proxy response unit 14 extracts the ARP Request from the broadcast type packet received from the network driver unit 19 and stores the ARP information (correspondence between the IP address and the MAC address) held by the address correspondence holding unit 16. Referenced and requested AR
P information as ARP Response ARP Re
quest is transmitted to the source IP address.

The shortcut delivery unit 17 transmits the destination IP of the IP packet received by the network driver 19.
The address conversion unit 11 attempts to convert the address into a MAC address. If the conversion is successful, the location information is obtained by the location information acquisition unit and transmitted to the telephone network 18 via the network driver, as in the case where the data transmission request is received from the network layer unit 92.
If the conversion fails, the network layer 92
, And entrusts the delivery of the packet to normal IP routing.

FIG. 3 is a flowchart for transmitting data to the telephone network 18, FIG. 4 is a flowchart for receiving data, and FIG. 5 is an ARP Request.
5 shows a flowchart when receiving st. 3 to 5, S1, S2 and the like indicate processing steps,
It is also written in the relevant part in FIG.

The processing at the time of data transmission will be described with reference to FIG. The network layer unit 92 that has received the IP packet transmission request from the upper layer 91 refers to the kernel ARP information unit 94 and, if there is a destination IP address of the IP packet, sends an IP packet transmission request to the address conversion unit 1. . In S1, the address conversion unit 11 receives an IP packet transmission request from the network layer unit 92. In S2, the address conversion unit 11 receives the received IP
The destination IP address is extracted from the packet. In S3, the address conversion unit 11 refers to the address correspondence holding unit 16 using the destination IP address as a key. S10
In the case where the destination IP address is in the address correspondence holding unit 16, the MAC address is obtained. However, in this embodiment, since the processing equivalent to the processing from S1 to S3 has already been performed in the network layer unit 92, the processing from S1 to S3 may be omitted. S4
In, the location information of the corresponding terminal is obtained from the obtained MAC address. In the case of a private PHS network, the location information is a paging area. Alternatively, it is information indicating the local PHS exchange to which the terminal is currently connected and the base station in the local PHS exchange. In S5, a call request is sent to the network driver unit 19 to the base station at the position indicated by the position information obtained in S4. At S3, the destination IP address is stored in the address
If not, the IP packet requested to be transmitted from the network layer unit 92 is discarded. This means that the destination terminal is not currently connected to the network, so there is no problem.

As described above, when the transmission request of the IP packet is received from the IP layer, the ARP information of the terminal connected to the telephone network is obtained from the proxy ARP information section, thereby utilizing the mobility management function in the telephone network. The IP in the most efficient path in the telephone network
The packet will be sent.

The processing at the time of data reception will be described with reference to FIG. When the mobile communication device receives an IP packet from the telephone network 18 via the network driver unit 19, the shortcut delivery unit 17 first intercepts in S7. In S8, the shortcut delivery unit 17
Extracts the destination IP address of the IP packet.
In S9, the shortcut delivery unit 17 refers to the ARP information in the address correspondence holding unit 16. S11 is a process in the case where there is the corresponding ARP information. In order to send the received IP packet back before it is subjected to the IP routing of the network layer unit 92, the address conversion unit 1
Pass to 1. Subsequent processing is the same as the processing after S10 in FIG. S12 is a case where there is no corresponding ARP information, and the ARP information is passed to the network layer unit 92 and is left to normal IP routing.

As described above, for a packet addressed to a terminal whose position can be specified in the telephone network,
It can be checked and extracted before being passed to the P layer and delivered within the telephone network without being passed to the IP layer. As a result, depending on the IP address, an IP packet that is transferred to another network and may follow an inefficient route can be efficiently delivered to the partner terminal.

The processing at the time of receiving the ARP Request will be described with reference to FIG. In S13, the proxy response unit 1
4 receives the ARP Request from the telephone network 18 via the network driver unit 19. S1
In 4, the proxy response unit 14 receives the ARP Req
The IP address of the address translation source requested by west is extracted. In S15, the address correspondence holding unit 1
6, the IP address is converted into a MAC address. In S16, the obtained IP address and MAC
The correspondence of the addresses is assembled as an ARP Response packet. In S17, ARP via the telephone network 18 via the network driver unit 19
ARP Response to the request source of the Request
Send In S15, the address correspondence holding unit 16
If the corresponding ARP information does not exist, if the mobile communication device is an IP router, the mobile communication device applies the MAC address of the mobile communication device to an IP address not held in the address correspondence holding unit 16. ARP using address
The information may be configured and an ARP Response sent. If the mobile communication device takes a bridge configuration, ARP Response complemented by the MAC address of the mobile communication device may cause network confusion.
It is better not to send se.

Thus, in the telephone network, the IP
ARP Reque sent prior to packet transmission
By responding to est as a proxy, an IP packet is transmitted to the mobile communication device on the nearest telephone network. As a result, depending on the IP address, an IP packet which may follow a redundant route by normal IP routing is guided to the mobile communication device, and the IP packet can be delivered via an optimal communication route in the telephone network. Become.

When the base station in the system configuration example shown in FIG. 6 is replaced with the mobile communication device of the present invention, the terminals A1 to C2 can freely move from the wireless areas A to C without implementing the Mobile IP protocol. However, it is possible to perform IP communication with each other.

Referring to FIG. 6, a case where terminal A2 attempts to connect to terminal A1 that has moved to wireless area C will be described. First, the terminal A2 requests an ARP Request specifying an IP address as the logical address of the terminal A1.
To the wireless area A. Originally, the terminal A1 that should respond to it is not in this wireless area A, so it cannot respond. Instead, the base station BS1, which is the mobile communication device of the present invention, uses the ARP Request
ARP Response is created and transmitted to wireless area A. If the wireless area A supports the broadcast, the BS1 naturally performs the ARP Request.
terminal A2 can receive base station BS and does not support broadcast.
Connect to 1 and ARP Request / Respons
e can be transmitted and received. Terminal A2 is A
Since the MAC address can be obtained from the RP Response as the physical address of the terminal A1, an IP packet addressed to the MAC address is transmitted to the BS1. This MAC
The address may be the MAC address of terminal A1 or the MAC address of BS1. Before transferring the received IP packet to the IP layer, the BS 1 obtains the position information of the terminal A1, which is the target terminal, from the IP address or the MAC address of the packet received at the level of the link layer that controls the wireless area. In the present embodiment, the position information indicates the wireless area C.
The BS1 transfers the IP packet to the BS3 that controls the wireless area C, and is delivered to the target terminal A1 at the link layer of the BS3.

As described above, the terminal A is transmitted from BS1 via BS3.
Until it is delivered to No. 1, it is not routed at the IP layer. However, there is also a method of realizing connection between BS1 and BS3 by an IP link.

If the data is passed to the IP layer by the BS1 or BS3, the route is controlled by the IP address of the terminal A1, and in this case, the IP packet is transmitted to the IP subnet NA to which the IP address of the terminal A1 belongs, that is, the wireless area A. As a result, the terminal A1 that is no longer in the wireless area A cannot receive the packet addressed to itself.

Next, a case where the terminal C1 sends an IP packet to the terminal A1 will be described with reference to FIG.
First, as in the case of the terminal A2, the terminal C1
An ARP Request specifying the P address is transmitted into the wireless area C. The BS3 refers to the proxy ARP information table, and replaces the terminal A1 with the ARP Responses.
e. If the broadcast is supported in the wireless area C, the terminal A1 itself responds to the ARP
Response may be transmitted. Terminal C1 is AR
Since the MAC address of the terminal A1 can be obtained from the P Response, an IP packet addressed to the terminal A1 is transmitted into the wireless area C. If the terminals can be directly linked in the wireless area C, the terminal A1 can receive the IP packet transmitted by the terminal C1.
Alternatively, terminal A1 can receive a packet from terminal C1 via BS3. When going through BS3,
The shortcut delivery unit 17 shown in FIG.
Before the IP packet is passed to the IP layer of S3, the terminal A
The packet addressed to 1 is looped back and sent out into the wireless area C.

Next, a description will be given of a method in which the mobility management apparatus of the present invention obtains the correspondence between the logical address and the physical address of the terminal in the network supporting the movement and the position information. For example. If the wireless area is configured by a PHS local area network, location registration can be executed each time the wireless area is switched. Therefore, the terminal must notify the BS that it has entered the area by this location registration sequence. Can be. In this location registration, the terminal can notify the BS of the correspondence between the IP address and the MAC address assigned to the terminal. The information of the terminals in the wireless areas A to C can be obtained between the BSs by exchanging information regularly between BSs or notifying information when a location is registered.

Alternatively, by registering the correspondence between the IP address and the MAC address assigned to each terminal at the time of subscriber registration of the terminal, it is possible to refer to and obtain the registration information when the location registration of the terminal occurs. Is also possible.

[0045]

According to the mobile communication method of the first aspect,
Retains correspondence between logical addresses and physical addresses and correspondence information from physical addresses to location information for terminals connected to a network that supports mobility, and performs translation on behalf of a request for translation from logical address to physical address when received. By responding to the result, when a transmission request to a terminal specified by a certain logical address occurs, the logical address is converted to a physical address, and the current position information of the target terminal is obtained from the physical address, By distributing there, there is no mobile communication mechanism in the layer that specifies each other by the logical address, and mobile communication of terminals that communicate with each other by the logical address using the mobile communication mechanism of the layer that specifies each other by the physical address. Is possible.
As a result, a terminal having a logical address does not need to have a protocol for mobility management, uses less memory,
A mobile terminal having sufficient CPU power can be configured.

According to the mobile communication method of the present invention, when data is received from a network, a logical address is converted to a physical address in the link layer before being routed in the network layer, and the data is transferred from the network. It is determined whether the terminal is a terminal or not, and if the terminal is in the network, without passing it to the network layer,
The data is looped back at the link layer, and the data is transmitted to the target terminal, so that it is possible to perform communication on the optimum communication path in the network.

[Brief description of the drawings]

FIG. 1 is a device configuration diagram of an embodiment of a mobile communication device according to the present invention.

FIG. 2 is a diagram showing an output example of kernel ARP information in the above-described device of the embodiment.

FIG. 3 is a flowchart at the time of data transmission in the device of the embodiment.

FIG. 4 is a flowchart at the time of data reception in the device of the embodiment.

FIG. 5 shows an ARP Requ in the above-described apparatus of the embodiment.
Flowchart when receiving est

FIG. 6 is a system configuration diagram showing a case where an IP terminal is moved on a telephone network in the device of the embodiment.

FIG. 7 is a device configuration diagram of a conventional communication device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Address conversion part 12 Position information acquisition part 13 Proxy ARP information part 14 Proxy ARP response part 16 Address correspondence holding part 17 Shortcut holding part 18 Telephone network 19 Network driver part 90 Communication device 91 Upper layer 92 Network layer part 93 Routing table 94 Kernel ARP information section 95 Conventional network driver section 96 LAN

Claims (8)

[Claims] 1. A communication device connected to a network supporting mobility at a link level, comprising: an address correspondence holding unit for holding an address correspondence between a physical address and a logical address assigned to a terminal; An address translation step of performing an address translation to the physical address, and a current location acquisition step of acquiring a current location of a terminal specified by the physical address from the physical address;
A connection step for performing a link-level connection with the terminal indicated at the current position, and if there is a request for conversion from a logical address to a physical address, the address conversion step is driven to perform the conversion, and the result is transmitted to the requesting terminal. And a proxy response step of transmitting the information to a mobile communication method. 2. The mobile communication method according to claim 1, wherein
A mobile communication method, comprising: a shortcut delivery step of transferring data to a target terminal in the data delivery step when the current location acquired in the current location acquisition step is in the same area as the source terminal. 3. The mobile communication method according to claim 1, wherein said location information is a paging area. 4. The mobile communication method according to claim 1, wherein the location information is information for specifying a base station with which the terminal can currently communicate. 5. The mobile communication method according to claim 1, wherein the correspondence between the physical address and the logical address is based on a MAC address and a telephone number assigned to the terminal at the time of subscriber registration of the terminal. The address translation step includes an IP address translation step of translating an IP address into a MAC address, and a MAC address translation step of translating a MAC address into a telephone number, and is obtained by the IP address translation step. The MAC address conversion step is an address conversion step of further converting the MAC address into a telephone number by the MAC address conversion step. The address correspondence holding step is a correspondence between the IP address of the terminal and the MAC address (this correspondence is hereinafter referred to as ARP information). Kernel ARP information table held in the communication module of the communication system Kernel ARP information table registration process for registering in the ARP
A proxy ARP information table registration step of storing ARP information that cannot be registered in the information table in a proxy ARP table.
The RP information is registered in the kernel ARP information table or the proxy ARP information table, and the address translation result transmitting step includes a broadcast type Ethernet frame transmitted on a line between the terminal and the communication system. And the ARP request, if it is an ARP request
And a response step of sending a response to the transmission source terminal.
The terminal specified by the destination MAC address of the packet
A mobile communication method, which is an IP packet delivery step of delivering a P packet. 6. The mobile communication method according to claim 1, wherein the correspondence between the physical address and the logical address is based on a MAC address assigned to the terminal obtained from the terminal when the terminal is registered. The address conversion step is the conversion of a telephone number from an IP address to M
Converting an IP address to an AC address;
And a MAC address conversion step of converting the C address into a telephone number. The MAC address conversion step converts the MAC address obtained by the IP address conversion step into a telephone number by the MAC address conversion step.
The address correspondence holding step includes a step of registering a correspondence between the IP address and the MAC address of the terminal (this correspondence is hereinafter referred to as ARP information) in a kernel ARP information table held in a communication module of the communication system. An ARP information table registration step of storing ARP information that cannot be registered in the ARP information table due to network inconsistency in a proxy ARP table. The address conversion result sending step is registered in the information table or the proxy ARP information table, and the broadcast step captures a broadcast type Ethernet frame transmitted on a line between the terminal and the communication system; If this is an ARP request, the process comprises a response step of sending the ARP response to the source terminal. The data delivery step is performed by the terminal specified by the destination MAC address of the IP packet transmitted from the terminal. A mobile communication method, which is an IP packet delivery step of delivering IP packets. 7. A mobile communication device comprising the mobile communication method according to claim 1, 2, 3, 4, 5, or 6. 8. The method of claim 1, 2, 3, 4, 5, 6, or 7.
A disk device for storing a program for realizing the mobile communication method described above.