JP3536822B2 - Mobile terminal management system, mobile terminal, agent and program - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a network for handling mobile terminals such as mobile information terminals and mobile phones, and in particular, notifies a care-of address of a mobile terminal to a communication partner in advance so that a packet can be transmitted directly to the mobile terminal. And a mobile terminal management system.

[0002]

2. Description of the Related Art Mobile IPv4, MobileIP
v6. In this protocol, a node such as a portable information terminal that frequently moves around and changes the connected sub-network is referred to as a mobile node (Mobile Node; MN), and a sub-network to which the mobile terminal is originally connected is referred to as a Home Link (Home Link; HL for short). ), A home agent (Home Agent; abbreviated as HA) a node in the home link that keeps the mobile terminal absent;
The sub-network to which the mobile terminal is actually connected is referred to as a foreign link (Foreign Link;
L), a foreign agent (Foreign Agent; abbreviated FA) on the foreign link that takes care of the mobile terminal while the mobile terminal is on the foreign link, and a care-of address (care- of address (abbreviated as COA), an address uniquely assigned to a mobile terminal irrespective of a connection sub-network is assigned to a home address (ho).
me address). However, MobileI
In Pv6, the role of a foreign agent does not exist because it can be absorbed by the mobile terminal itself or the IPv6 mechanism. Also,
Correspondence of the mobile terminal (Correspondence)
Node (abbreviated CN) includes fixed terminals in addition to other mobile terminals.

In a network based on the Mobile IPv4 and IPv6 protocols, the following processing is generally performed.

(1) When the mobile terminal is on the home link In this case, the state is the same as that of normal TCP / IP, and the mobile terminal communicates with the communication partner in the same manner as usual.

(2) When the mobile terminal is located outside the home link When the mobile terminal notices that the mobile terminal is located outside the home link, all the packets addressed to the home address are forwarded to the terminal itself. To notify new care-of address to
Perform me Registration. In the case of IPv6, the mobile terminal directly makes a registration request to the home agent.

(2-1) Arrival of Packet A packet transmitted from a communication partner and destined for a home address arrives at a home link according to a normal IP routing mechanism. Home agent is Pr
This packet is captured by a method such as oxy ARP and transferred to the foreign agent of the network where the mobile terminal is located by using tunneling, so that the packet is delivered to the mobile terminal. In the case of IPv6, the mobile terminal that has received the tunneled packet makes a new registration request to the communication partner that has transmitted the packet and notifies the care-of address, and thereafter, the communication partner transmits the packet to the mobile terminal. Sends a packet directly using its care-of address.

(2-2) Transmission of Packet When transmitting a packet from a mobile terminal to a communication partner, the source address of the IP header is transmitted with the home address. If any error occurs on the way, it is sent to the home address, and as a result, it is returned to the mobile terminal using the above-described mechanism. In the case of IPv6, a care-of address is set as a source address, and a home address is indicated by a newly defined Destination option.

[0008]

In the case of the IPv4 protocol, there is a problem of so-called triangle routing because a packet addressed to a mobile terminal is always sent through a home agent. In IPv6, in order to solve this problem, when the mobile terminal receives a tunneled packet, it determines that the communication partner does not know the care-of address, and notifies the communication partner of the care-of address with the binding update option. The communication partner sends the packet directly using the care-of address. However, the first packet sent from a communication partner that does not know the care-of address of the mobile terminal is always sent via the home agent, so that the overhead is a problem. Even more problematic is the situation where many communication partners start sending packets to the same mobile terminal or the home agent simultaneously to multiple mobile terminals generated on the same node. The load is concentrated at once.

It is an object of the present invention to notify the latest care-of address of a mobile terminal to a plurality of communication partners in advance so that the first packet addressed to the mobile terminal can be directly transmitted from the communication partner. .

Another object of the present invention is to reduce the load on a mobile terminal when notifying a care-of address to a plurality of communication partners in advance.

[0011]

SUMMARY OF THE INVENTION The present invention is directed to a network for handling mobile terminals having a plurality of interconnected sub-networks and having a care-of address dependent on the currently connected sub-network and a home address independent of the sub-network. The mobile terminal is performed at the mobile terminal
Monitor the communication and check if the number of communications is greater than the predetermined number.
The home address of a certain number of upper
Communication partner list holding tube for generating and holding a communication partner list
And a means for transmitting a binding update request for notifying a new care-of address with the communication partner list when the connected sub-network is changed,
And an agent for receiving the binding update request and notifying each communication partner listed in the communication partner list of the latest care-of address and home address pair of the mobile terminal.

[0012]

The present invention is also applicable to a network conforming to the MobileIPv6 protocol even in a MobileIPv4 protocol.
It is also applicable to networks that conform to the program. In the former case, the agent is the home agent of the mobile terminal, and in the latter case, the agent is the home agent or foreign agent of the mobile terminal.

[0014]

According to the present invention, when the subnetwork to which a mobile terminal connects changes, the number of times of communication with the mobile terminal is reduced.
Since the pair with the latest care-of address and the home address of the person <br/> the mobile terminal from the communication phase hand often higher predetermined number of times of the predetermined is notified, their communication partner care-from the first packet It can be sent directly to the address.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a system configuration diagram according to an embodiment of the present invention. This system is compatible with MobileIPv
It is an improvement based on a 6-protocol network.
00, a plurality of sub-networks, link 10
1, 102 and 103 are mutually connected. Although one or more mobile terminals can be connected to each of the links 101 to 103, FIG. 1 shows only one mobile terminal 104 and its communication partner 105 for convenience of explanation. The home agent is the home agent 1 of the mobile terminal 104.
Only 06 is shown. The location indicated by the broken line in the link 101 is the home position of the mobile terminal 104. That is, for the mobile terminal 104, the link 101 is a home link, the links 102 and 103 are foreign links, and FIG. 1 shows a state where the mobile terminal 104 is connected to the foreign link 103. The communication partner of the mobile terminal 104 includes not only other mobile terminals but also fixed terminals such as personal computers. FIG. 1 illustrates a communication partner 107 as a fixed terminal with which the mobile terminal 104 communicates. If the configuration of FIG. 1 is adapted to a 3G mobile network, the relationship between home agent 106 and mobile terminal 104 is GGS
N (Gateway GPRS Support No.
de) and the mobile terminal.

The mobile terminal 104 uses MobileIPv6
And a function of maintaining and managing a communication partner list, and a binding update request for notifying a new care-of address with the communication partner list when a connection link changes, to the home agent 106. Transmission function. The communication partner list is a list in which home addresses are recorded for each communication partner, as shown in FIG.

The home agent 106 is Mobil
It has the same function as the home agent in eIPv6, and when receiving the binding update request from the mobile terminal 104, moves to the individual communication partner listed in the attached communication partner list by the movement notified by the request. A function of transmitting a binding update request for notifying a new care-of address of the terminal 104 is provided.

FIGS. 3 and 4 are sequence diagrams of processing in the present embodiment, and also show processing examples performed by the mobile terminal, home agent, and communication partner. Note that such processing is executed by a computer configuring the mobile terminal, home agent, and communication terminal according to a program stored in a memory configuring the communication terminal. Hereinafter, the operation of the present embodiment will be described with reference to the drawings.

(1) When the mobile terminal 104 moves to the foreign link The mobile terminal 104 moves when it moves from the home link 101 to the foreign link 102 or 103 and when it moves from the foreign link to another foreign link.
Like the mobile terminal of leIPv6, it recognizes that it has moved from the router advertisement to the foreign link, and acquires a new care-of address (S101 in FIG. 3). The method of acquiring the care-of address is statefull addr by DHCPV6.
essaautoconfiguration or s
teethless address autoconf
igu- lation (RFC1971). Now, let the care-of address newly acquired by the mobile terminal 104 be X: a. Here, X: a is a 128-bit I
Pv6 indicates an address, X indicates a network prefix of a newly connected link, and a indicates an interface ID of the mobile terminal 104.

Next, the mobile terminal 104 attaches the communication partner list shown in FIG. 2 to the acquired care-of address, and transmits a binding update request to the home agent 106 (S102). FIG. 5A shows a format example of a packet of a binding update request transmitted from the mobile terminal 104 to the home agent 106. The care-of address is set as the source address (SA) and the address of the home agent 106 is set as the destination address (DA) of the IPv6 header, and the home address of the mobile terminal 104 and the communication partner list are attached.

The home agent 106 is the mobile terminal 1
When receiving the binding update request from the mobile terminal 104, the mobile terminal 104 updates its own binding cache and registers the pair of the care-of address and the home address of the notified mobile terminal 104 (S103). Next, the home agent 106 sends a message to the mobile terminal 1 for each of the communication partners listed in the communication partner list attached to the binding update request.
The process of transmitting the binding update request specifying the care-of address notified from 04 is repeated (S104).
In the case of the communication partner list of FIG.
A binding update request is transmitted to m communication partners up to m. FIG. 5B shows the home agent 106.
2 shows a format example of a packet of a binding update request transmitted to a communication partner. The care-of address of the mobile terminal 104 is set to the source address (SA) of the IPv6 header, the home address of the communication partner is set to the destination address (DA), and the home address of the mobile terminal 104 is attached.

Each of communication partners CN1 to CN1 receiving the binding update request transmitted from home agent 106
CNm updates its own binding cache and registers the pair of the care-of address and the home address of the notified mobile terminal 104 (S105).

Note that the binding update request transmitted by the home agent 106 to the communication partner is Mobile
The binding update option in IPv6 can be used. Also, the binding update request transmitted by the mobile terminal 104 to the home agent 106 is:
This can be realized by adding a communication partner list to a binding update option in MobileIPv6.

(2) Packet transmission to mobile terminal 104 When a communication partner transmits a packet to mobile terminal 104,
The upper layer protocol or application of the communication partner uses the home address as the address of the mobile terminal 104.
A packet in which the home address of the mobile terminal 104 is specified as a destination is handled differently depending on whether the care-of address corresponding to the home address exists in the binding cache of the communication partner or not. When the care-of address of the mobile terminal 104 exists in the binding cache as in the communication counterparts CN1 to CNm in FIG. 3, direct transmission by the care-of address is performed immediately from the first packet (S106). On the other hand, when the care-of address of the mobile terminal 104 is the communication partner CNn in FIG. 3 where the care-of address does not exist in the binding cache, the first packet is transmitted via the home agent 106 (S107, S108), and the mobile terminal 104 sends the packet to the communication partner CNn. When the binding update request for notifying the care-of address is transmitted (S109), the communication partner CNn
The binding cache is updated in (S11
0), and subsequent packets are directly transmitted by the care-of address (S111).

Hereinafter, the processing in both cases will be described by taking as an example a case where a packet is transmitted from communication partner 105 to mobile terminal 104 in FIG. Note that the home address of the mobile terminal 104 is Xh, the home address of the communication partner 105 is Y, and the address of the home agent 106 is H.

(2-1) When the care-of address of the mobile terminal 104 exists (see FIG. 6). The IP layer of the communication partner 105 transmits a packet in which the home address Xh of the mobile terminal 104 is specified as a destination from the upper layer. Upon receipt, the binding cache 1051 is searched with the home address Xh to obtain the care-of address X: a ((a) in FIG. 6). Next, the destination address is rewritten to the care-of address X: a, the home address Xh of the mobile terminal 104 is set as a relay point in the route control header, and the packet is transmitted ((b)). When the mobile terminal 104 receives the packet and processes the route control header ((c)), the destination is the home address, so the mobile terminal 104 interprets it as a packet addressed to itself and receives it ( (D)).

(2-2) When the care-of address of the mobile terminal 104 does not exist (see FIG. 7) The IP layer of the communication partner 105 transmits a packet in which the home address Xh of the mobile terminal 104 is specified as a destination from the upper layer. Upon receipt, the binding cache 1051 is searched with the home address Xh ((a) in FIG. 7). However, since the binding cache 1051 does not exist, the packet is transmitted with the home address Xh designated as the destination ((b)). The packet is captured by the home agent 106 ((c)). The home agent 106 acquires the care-of address X: a of the mobile terminal 104 from its own binding cache (not shown), and the source address is the home agent address H, and the destination is the care-of address X: a of the mobile terminal 104. An IPv6 header (tunnel header) is added to the head of the captured packet and transmitted ((d)). That is, tunneling to the care-of address of the mobile terminal 104 is performed. After removing the tunnel header ((e)), the tunneled packet is processed as a normal IPv6 packet ((f)). Further, the mobile terminal 104 transmits a binding update option to the communication partner 105 ((g)), and causes the binding cache 1051 to register a pair of the home address Xh and the care-of address X: a of the mobile terminal 104. Thereafter, the communication partner 105 transmits the packet directly to the care-of address X: a of the mobile terminal 104.

(3) Packet Transmission from Mobile Terminal 104 When the mobile terminal 104 transmits a packet to a communication partner, the home address Xh is used as it is as the source address in the upper layer. In the IP layer, the source address Xh of the packet is stored in the home address option, and the source address is replaced with the care-of address X: a and transmitted.
In the IP layer of the communication partner receiving the packet, the reverse operation is performed, the home address Xh of the mobile terminal 104 is extracted from the home address option of the packet, the source address X: a of the packet is returned to the home address, and Pass to.

(4) When the mobile terminal 104 returns to the home link (see FIG. 4) When the mobile terminal 104 recognizes that it has returned to the home link by the same detection method as in the above (1) (FIG. 4) S20
1), a binding update request having a format as shown in FIG. 5A is transmitted to the home agent 106 with the communication partner list of FIG. 2 added (S202). However, the home address Xh is inserted at the location of the care-of address X: a in FIG. Also, the mobile terminal 104 receives the unsolicited neighbor advertisement (unsolicited neighbor advertisement) so that it can receive the packet addressed to its home address Xh by itself.
multicast is transmitted to all nodes of the home link (S203).

The home agent 106 that has received the binding update request from the mobile terminal 104 that has returned to the home link updates its own binding cache and registers that the mobile terminal 104 is on the home link (S204). For each communication partner listed in the communication partner list attached to the binding update request,
The process of transmitting a binding update request as shown in FIG. 5B for notifying that the mobile terminal 104 has returned to the home link is repeated (S205). However, FIG.
The home address Xh is entered at the location of the care-of address X: a. Thereafter, the home agent 106 stops the mobile terminal 104's packet capturing and forwarding service.

Each of the communication partners CN1 to CNm, which has received the binding update request from the home agent 106,
The pair of the care-of address and the home address of the mobile terminal 104 is deleted from its own binding cache (S206). Thereafter, when transmitting the packet to the mobile terminal 104, the communication partners CN1 to CNm directly transmit the packet to the home address (S207).

As described above, according to the present embodiment, when the connection link of mobile terminal 104 changes, the latest care-of address is notified to a plurality of communication partners, so that each notified communication partner can receive the mobile terminal. Immediately after the first packet addressed to 104, the packet can be sent directly to the care-of address of the mobile terminal 104. For this reason, the overhead via the home agent can be reduced. Also, in a situation where many communication partners start sending packets to the same mobile terminal or a home agent simultaneously to a plurality of mobile terminals generated on the same node,
The load does not concentrate on home agents and nodes at once. Further, the processing of the mobile terminal 104 only needs to transmit a binding update request to which the communication partner list is attached to the home agent 106, and the home agent 106 transmits the binding update request to each communication partner in the communication partner list. As a substitute, the load on the mobile terminal 104 can be reduced.

Next, the communication partner list holding management function of the mobile terminal 104 will be described. If there is no restriction on the amount of memory for storing the communication partner list and the communication cost for sending the communication partner list, a list of all communication partners that have transmitted and received packets in the past may be held. However, in the following, the upper limit (n
The following describes an example in which a list of the top n communication partners who frequently transmit and receive packets is held and managed.

FIG. 8 is a block diagram of the communication partner list holding and managing mechanism provided in the mobile terminal 104. The communication partner list holding and managing mechanism includes an association table 201, a communication count updating circuit 202, a replacement candidate determination circuit 203, an access control circuit 204, and an update instruction circuit 205.

The associative table 201 is a fully associative associative memory having n + m entries, and the extracting unit associative memory 206 is composed of n consecutive entries.
Is formed, and the recurring unit associative memory 2 is composed of the remaining m entries.
07 is configured. Finally, the extraction unit associative memory 206
Stores a list of the top n communication partners with high communication frequency. The traveling unit associative memory 207 is used to temporarily store a list of communication partners that are not included in the top n items.

Each entry of the associative table 201 is associated with the associative key unit 2
08 and a data section 209. The data section 209 is divided into a communication count section 210 and an order / LRU information section 211. The associative key unit 208 registers the home address of the communication partner, and the communication count unit 210 registers the communication count. In the order / LRU information section 211, order information is registered in the extraction unit associative memory 206. That is, each entry of the extraction unit associative memory 206 has the order / L
According to the order information registered in the RU information section 211, FIG.
As shown in (2), they are logically arranged in ascending order in descending order of the number of communications. In FIG. 9, reference numeral 301 denotes a pointer indicating the entry 300 having the smallest number of times of communication among the n entries, and is provided in the replacement candidate determination circuit 203.

In the traveling unit associative memory 207, the order /
The LRU information is registered in the LRU information section 211, and the entry that has not been referred to for the longest time is reused according to the LRU algorithm. That is, as shown in FIG. 9, the recurring unit associative memory 207 composed of m entries is logically arranged in order from the most recently referred one, and indicates the entry 302 that has not been referred to for the longest time. Replacement candidate determination circuit 20 having pointer 303
3 determines the entry to be overwritten in the recurring unit associative memory 207 using the pointer 303 by the LRU method.

The update instruction circuit 205 is connected to the update instruction bus 21
2 is connected to an MPU (not shown) constituting the mobile terminal 104, and the home address of a communication partner who has transmitted and received packets from a communication application program operating on the MPU via the update instruction bus 212. When notified, it is transmitted to the address line 213 at the same time as it is transmitted to the communication count updating circuit 202. The address line 213 is an associative key part 20 of each entry of the associative table 201.
The home address registered in the associative key unit 208 is compared with the home address on the address line 213 in the comparator in each of the associative key units 208, and the respective comparison results are compared. The data is transmitted to the communication frequency updating circuit 202 via the line 214.

The communication count updating circuit 202 includes an association table 201
And updates the communication count of the entry for which the home address match is reported by the comparison result line 214 by +1. Then, the replacement candidate determination circuit 203 is activated by designating the updated entry. If none of the comparison result lines 214 indicates a match, that is, if the home address output to the address line 213 has not been registered in the associative table 201, the communication count updating circuit 202 sends the replacement candidate associative memory Issues a request to secure the entry in 207,
The communication count of the secured entry is initialized to one.

When the replacement process is started from the communication count updating circuit 202, the replacement candidate determination circuit 203 performs the following process. (1) If the current entry whose communication count has been updated is an entry included in the extraction unit associative memory 206, as described with reference to FIG. 9, the n entries in the extraction unit associative memory 206 are logically represented by the communication count value. The order information and the pointer 301 of the order / LRU information section 211 are updated as necessary so that they are arranged in ascending order. (2) When the current entry whose communication count has been updated is an entry included in the traveling unit associative memory 207, the communication count of the entry and the communication of the entry 300 indicated by the pointer 301 in FIG. If the former communication count is equal to or greater than the latter communication count,
The contents registered in the entry and the contents registered in the entry 300 of the extraction unit associative memory 206 are exchanged.

On the other hand, when there is a request to secure an entry from the communication count updating circuit 202, the replacement candidate determination circuit 203 changes the entry 302 indicated by the pointer 303 in FIG. Determine the entry to be kicked out. Then, the associative key unit 208 of the entry 302 is changed by the associative key update instruction line 215.
Is registered in the home address, and the entry 302
To the communication count updating circuit 202.

The access control circuit 204 is connected to the MPU through an access bus 216. The access control circuit 204 is connected to the extraction unit associative memory 206 of the association table 201 by an access line 217 including a data line and an address line. Extraction unit associative memory 20 of associative table 201 by designation
6 can be read.
Among the read contents, the n home addresses registered in the associative key unit 208 become a list of the top n communication partners having high communication frequency with the mobile terminal.

FIG. 8 shows an example in which the list of the top n communication partners having the highest frequency of packet communication (transmission / reception) is maintained and managed, but the home address of the communication partner that transmitted the packet from the communication application program is notified. Instead, by notifying only the home address of the communication partner that has received the packet to the update instruction circuit 205 via the instruction bus 212, it is possible to maintain and manage a list of the top n communication partners with the highest packet reception frequency.

Although the communication partner list holding and managing mechanism described above is implemented by hardware, it can also be implemented by software. In that case, a dedicated program is stored in the memory of the mobile terminal. The program stored in the memory is read by the computer constituting the mobile terminal, and is stored on the computer in the association table 201, the communication count updating circuit 202, the replacement candidate determination circuit 203, the access control circuit 204, and the update instruction circuit 205 in FIG. Implement corresponding functional means.

The above embodiment is based on MobileIPv
Although the present invention is based on a 6-protocol network, the present invention is also applicable to a MobileIPv4 protocol network. In this case, when the mobile terminal moves the connection link, the mobile terminal notifies the home agent of the new care-of address and the communication partner list through the foreign agent, and the home agent performs the mobile communication with respect to each communication partner in the communication partner list. The pair of the home address and the care-of address of the terminal may be notified, or the foreign agent notifies the home agent similarly to MobileIPv4, and the foreign agent notifies the individual communication partner in the communication list of the mobile terminal. May be notified of the pair of the home address and the care-of address. The communication partner stores the pair of the home address and the care-of address of the mobile terminal in the memory, and when transmitting a packet to the mobile terminal, searches the memory by the home address and, if a corresponding care-of address exists, the care-of address. Send the packet directly to.

In the above embodiment, the agent performs the process of notifying each communication partner in the communication partner list of the latest care-of address and home address pair of the mobile terminal. The processing may be performed.

[0048]

As described above, according to the present invention, the first packet addressed to the mobile terminal can be sent directly from the communication partner. The reason is that when the sub-network to which the mobile terminal connects changes, a plurality of communication partners, such as a certain number of communication partners with the highest number of communications with the mobile terminal, are notified of the latest care-of address and home address of the mobile terminal. Because the pair is notified, those communication partners can directly transmit to the care-of address from the first packet.

Further, according to the present invention, the load on the mobile terminal when notifying the care-of address to a plurality of communication partners in advance can be reduced. The reason is that, when the mobile terminal transmits a binding update request to which the communication partner list is attached to the agent, the agent substitutes the transmission of the binding update request to each communication partner in the communication partner list.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a communication partner list.

FIG. 3 is a sequence diagram of a process according to the embodiment of the present invention.

FIG. 4 is a sequence diagram of a process according to the embodiment of the present invention.

FIG. 5 is a diagram illustrating a format example of a packet of a binding update request transmitted by a mobile terminal to a home agent and a binding update request transmitted by a home agent to a communication partner;

FIG. 6 is an explanatory diagram of a process when transmitting a packet from a communication partner who knows a care-of address to a mobile terminal.

FIG. 7 is an explanatory diagram of a process when a packet is transmitted from a communication partner who does not know a care-of address to a mobile terminal.

FIG. 8 is a block diagram of a communication partner list holding and managing mechanism provided in a mobile terminal.

FIG. 9 is an explanatory diagram of a method of arranging entries in an associative memory of an extracting unit and a circulating unit associative memory which constitute an associative table of a communication partner list holding and managing mechanism.

[Explanation of symbols]

100: IP core network 101: Home link (HL) of mobile terminal 104 102, 103: Foreign link (F) of mobile terminal 104
L) 104: Mobile terminal (MN) 105, 107: Communication partner (CN) of mobile terminal 104 106: Home agent (HA)

Continuation of front page (56) References Charles Perkins & David B.S. Johnson, Route Optimization in Mobile IP, draft t-etf-mobileip-op tim-08. txt, February 25, 1999 Hiroyuki Onishi, Takeshi Ihara, Yasushi Takagi, Proposal of Route Optimization Method in Mobile IP Network, IEICE Technical Report, Japan, IEICE, December 17, 1999 , Vol. 99 No. 507, p7-12 (58) Fields investigated (Int. Cl. ⁷ , DB name) H04L 12/56 H04L 12/28-12/46 H04Q 7/00

Claims (12)

(57) [Claims] 1. A network for handling mobile terminals comprising a plurality of interconnected sub-networks and having a care-of address dependent on a currently connected sub-network and a home address independent of said sub-network, said mobile terminal comprising: Monitor communications performed on mobile terminals
And the number of communications is higher than a predetermined number.
List of communication destinations that describes the home address of the communication partner
Communication list management means for generating and holding
When the connected subnetwork changes, the communication partner
Bind to notify new care-of address with list
Means for transmitting a binding update request, and receiving the binding update request and
Each communication partner listed in the list gives the latest awareness of the mobile terminal.
Notifying the pair of attached address and home address
A mobile terminal management system comprising an agent . 2. The communication partner list holding / managing means includes:
The number of communications is higher than the predetermined number
Data including the home address of the communication partner and the number of communications
The extraction unit memory for storing and the number of communication times are determined in advance.
Communication partner that is less than or less than
Data including the home address and the number of communications
The traveling unit memory to be stored and each new communication with the communication partner
In addition, the number of top
The data including the home address of the communication partner
The number of communications so that the data remains in the extraction unit memory.
New, home between the traveling unit memory and the extracting unit memory
Replacement of data including address and number of communications and said
Including the home address and the number of communications in the extractor memory
Control means for exchanging data.
The mobile terminal management system according to claim 1, wherein 3. The communication means according to claim 1, wherein said control means is a communication partner of the new communication.
Data including the home address of the
And it is not stored in any of the traveling unit memories
Secures an empty entry in the traveling unit memory and
The data including the home address of the communication partner and the initial number of communication times
Data has been registered and stored in the traveling unit memory
Updates the number of communication times of the stored data.
The traveling unit memory and the extraction unit memory as required.
Insert data including home address and number of communications between
Replacement and stored in the extraction unit memory
Updating the number of times of communication of the stored data.
The mobile terminal management system according to claim 2, wherein: 4. The network is MobileIPv
4. The mobile terminal management system according to claim 2, wherein the network is a network conforming to the six protocols, and the agent is a home agent of the mobile terminal. 5. The network according to claim 1, wherein said network is MobileIPv
4. The mobile terminal management system according to claim 2, wherein the mobile terminal management system is a network conforming to four protocols, and the agent is a home agent of the mobile terminal. 6. The network according to claim 1, wherein said network is MobileIPv4.
4. The mobile terminal management system according to claim 2, wherein the mobile terminal management system is a network conforming to four protocols, and the agent is a foreign agent of the mobile terminal. 7. A mobile terminal having a care-of address dependent on a currently connected sub-network and a home address independent of said sub-network, wherein communication performed by said mobile terminal is performed.
Monitored and the number of communications is higher than the predetermined number
A communication partner that describes a certain number of communication partner home addresses
Communication partner list holding management means for generating and holding a list
And a means for transmitting a binding update request for notifying a new care-of address together with the communication partner list when a connected sub-network is changed. 8. The communication partner list holding and managing means includes:
The number of communications is higher than the predetermined number
Data including the home address of the communication partner and the number of communications
The extraction unit memory for storing and the number of communication times are determined in advance.
Communication partner that is less than or less than
Data including the home address and the number of communications
The traveling unit memory to be stored and each new communication with the communication partner
The upper first communication number is greater than the number of times said predetermined
The data including the home address of the communication partner
The number of communications so that the data remains in the extraction unit memory.
New, home between the traveling unit memory and the extracting unit memory
Replacement of data including address and number of communications and said
Including the home address and the number of communications in the extractor memory
Control means for exchanging data.
The mobile terminal according to claim 7, wherein the mobile terminal is a mobile terminal. 9. A mobile terminal comprising a plurality of interconnected sub-networks and having a care-of address dependent on a currently connected sub-network and a home address independent of said sub-network , wherein said communication is performed by said mobile terminal. The moni
And the number of communications is higher than a predetermined number
Communication partner list that lists the home addresses of
Communication partner list holding management means for generating and holding
When the connected sub-network changes,
Vine to notify new care-of address with hand list
An agent in a network handling mobile terminals , comprising:
Means for receiving a binding update request transmitted from the mobile terminal when the sub-network to be connected has changed, and providing the mobile terminal with each communication partner listed in the communication partner list attached to the received binding update request. An agent device comprising means for notifying a pair of the latest care-of address and home address. 10. The computer constituting the mobile terminal and a home address that is independent of the care-of address that depends on the sub-network that is currently connected, the moving end
The communication performed at the end is monitored and the number of communication is determined in advance.
Home addresses of a certain number of communication partners that are higher than the number
Communication partner that generates and holds a communication partner list describing
A program functioning as a list holding and managing unit, and a unit for transmitting a binding update request for notifying a new care-of address together with the communication partner list when a connected sub-network is changed. 11. The communication partner list holding / managing means,
A certain number of higher ranks where the number of times of communication is greater than the predetermined number of times
Including the home address of the other party and the number of communications
And an extraction unit memory for storing the
Communication phases that are less than or equal to
Temporary data including hand home address and number of communications
Access the traveling unit memory stored in the
For each new communication, the communication count is the predetermined number of times.
Home address and communication of a certain number of higher
As data including the number of times of communication remains in the extraction unit memory,
Update of the number of communications, the traveling unit memory and the extracting unit memory
Data including home address and number of communications between
Replacement and home address in the extraction unit memory;
Has control means for exchanging data including the number of communications
The program according to claim 10, wherein: 12. A mobile terminal comprising a plurality of interconnected sub-networks, having a care-of address dependent on a currently connected sub-network and a home address independent of said sub-network, the communication being performed by said mobile terminal. The
The top one whose communication count is greater than the predetermined count
Communication partner list with the constant home address of the communication partner
Communication partner list holding management means for generating and holding a list
When the connected sub-network changes,
Notification of new care-of address along with peer list
End means for sending an indication update request
The computer constituting the agent in a network for handling end, means for receiving a binding update request sent from the mobile terminal when the subnetwork is changed to be connected to the contact list which is attached to the binding update request received A program functioning as means for notifying each of the listed communication partners of a pair of the latest care-of address and home address of the mobile terminal.