JP3080039B2 - Location registration method of mobile terminal in mobile communication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a mobile station that moves freely in a network, a mobile terminal (hereinafter referred to as MN) connected to the mobile station,
A location registration method in a PHS (Personal Handy Phone System) packet communication system including a base station that performs wireless communication with the mobile station, a base station controller that manages the base station, and an agent that manages the location of the mobile terminal About.

[0002]

2. Description of the Related Art Conventionally, L constructed by Ethernet
On an AN (Local Area Network), IP (In
In order to guarantee communication when a terminal having an Internet Protocol (mobile) address moves across a network, an IETF (Internet Engi) is used.
nearing Task Force)
ile-IP (RFC2002, “IP Mobili
ty Support ", RFC: Request F
or Comment) has been proposed.

[0003] FIG. 11 shows a network configuration in the above Mobile-IP. The MN 18 is a mobile terminal that moves through a network, and is a CN (Correspond).
The dent node 19 is a partner terminal that communicates with the MN 18. 20 is an HA (Home Agent) 1
0 manages the home network in the MN 18, 2
Reference numeral 1 denotes a foreign network managed by an FA (Forging Agent) 11. 23 is another IP network. The HA 10 exists in the home network 20 of the MN 18 and holds location registration information indicating to which network the MN 18 is currently connected. The HA 10 transmits the data (IP
Packet) from the CN 19, the data is transferred to the foreign network 21 to which the MN 18 is connected.
Deliver to. This is called tunneling. FA11 is
The MN 18 exists in the foreign network 21 to which the MN 18 is temporarily connected, receives data distributed by tunneling from the HA 10, and delivers the data to the MN 18. HA10
The distribution (tunneling) of data addressed to the MN 18 to the FA 11 is performed by encapsulation. Encapsulation refers to HA enclosing data destined for MN18.
This is to add a header from 10 to FA11. The HA 10 encapsulates data destined for the MN 18 and outputs the encapsulated data to the IP network 23. The FA 11 receives the encapsulated data from the IP network 23, decapsulates the data, extracts the data addressed to the MN 18, and passes the data addressed to the MN 18 to the MN 18. The HA 10 and the FA 11 are collectively referred to simply as an agent. Mob
In the ile-IP, a fixed IP address (home address) that is constant regardless of movement and a variable IP that is assigned when moving across a network are provided to the MN 18.
Address (care-of address)
The N18 registers the above two addresses in the HA 10 existing in the home network and the FA 11 managing the destination network. When the MN 18 exists in the foreign network 21, the CN 19 sends the MN
When the IP packet is transmitted by designating the home address of No. 18, the IP packet is transmitted from the HA 10 to the FA 11
Tunneled to the MN from the FA 11
Delivered to 18.

[0004] As shown in FIG. 11, the MN 18 moves from a home network 20 to a foreign network 21.
In the case of moving to a different network of the managing agent as described above, the registration of the care-of address of the MN 18 needs to be changed, so the location registration is required for the HA 10 and the FA 11 and the detection of the movement is performed. Must be performed by the MN 18, and the MN 18 needs to perform location registration with respect to the HA 10 and the FA 11.

[0005] As shown in FIG. 11, when the MN 18 moves from the home network 20 to the foreign network 21, a sequence of movement detection and location registration in Mobile-IP is shown in FIG. 12. In FIG.
HA10 is in the format shown in FIG.
002 ICMP (Internet Control)
Message Protocol) Router
Agent Add which extends Discovery
The rtisement message is broadcast periodically. Agent Advertisemen
The t message is a message notifying the service contents of the agent. MN18 is Agent Adv
The currently connected agent can be known by using the message. Thus, the MN 18 knows the current position by receiving the above message. M at 1003
The N18 moves from the home network 20 to the foreign network 21. Then, MN18 is in FA1
Agent of 1004 output periodically from 1
By receiving the Advertisement message, it knows the current position and detects that the MN 18 has moved from the home network 20 to the foreign network 21. The MN 18 that has detected the movement is the FA 1
1, a location registration message 1006 is transmitted in the format shown in FIG. The FA 11 that has received the location registration message of 1006 transfers the location registration message of 1007 to the HA 10. After receiving the location registration message of 1007, the HA 10 performs location registration processing so that the MN 18 can perform packet communication even in the foreign network 21, and then performs HA in the format shown in FIG.
8 is transmitted. The FA 11 that has received the registration response message by 1008 transmits the registration response message of 1009 to the MN 18, and the MN 18 receives the registration response message. The location registration is completed as described above, and the MN 18 can perform packet communication at 1010.

[0006]

However, in the PHS packet communication system, the network is constituted by radio, and the above-mentioned Agent Advertiseme is used.
Broadcasting the nt message periodically on the network has a problem from the viewpoint of effective use of the bandwidth of the wireless channel. The present invention has been made in order to solve the above problems, and while effectively utilizing the bandwidth of a wireless channel in a wireless communication system,
It is an object of the present invention to obtain a location registration method capable of detecting movement of a mobile terminal.

[0007]

A location registration method for a mobile terminal in a mobile communication system according to the present invention includes a plurality of networks having an agent and a base station, a mobile station performing wireless communication with the base station, and a mobile station. In a mobile terminal location registration system in a mobile communication system including a mobile terminal connected to a mobile terminal, the mobile station transfers management information communicated between the base station and the mobile station to the mobile terminal, The terminal detects the movement of the mobile terminal between networks based on the transferred management information and registers the location with the agent.

[0008] The management information is information indicating that a handover process of the mobile station has occurred.

[0009] The management information is information indicating that the location registration processing of the mobile station has occurred.

[0010] The management information is an identifier of the base station broadcast from the base station.

[0011] The management information is information used for location registration notified from a base station.

The mobile station transmits a location registration message from the mobile terminal to an agent using a control channel to perform location registration of the mobile terminal.

[0013] The mobile station transfers information broadcast on a control channel as management information to the mobile terminal, and the mobile terminal determines necessity of location registration based on the information broadcast on the control channel. It is characterized by.

[0014] The mobile terminal determines the necessity of location registration by making an inquiry to a network agent.

[0015] The above-mentioned mobile communication system is a personal handy phone system (PHS) packet communication system which is connected to an IETF (Internet Engineering).
(Task Force) Mobile-IP.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. Hereinafter, a position registration method in a PHS packet communication system will be described as an example of the present invention with reference to the drawings. FIG. 1 is a network configuration diagram showing an embodiment of a PHS packet communication system. In FIG. 1, the home network 20 includes a base station 13
And a base station controller (Base Station C) accommodating the base station 13 connected to the IP network 23.
controller: a wireless zone managed by the BSC 24. BSC2
4 is HA1 which is a Mobile-IP agent.
0 function. The foreign network 21 is composed of a base station 14 and a BSC 25 provided with an FA 11 that is a Mobile-IP agent. The foreign network 21 is a network in which the mobile station 17 and the MN 18 exist before moving, and is managed by the BSC 25. It is a wireless zone. Similarly, the foreign network 22 is composed of base stations 15 to 16 and a BSC 26 provided with an FA 12 that is a Mobile-IP agent, and is a network in which the mobile station 17 and the MN 18 exist after the movement, and is managed by the BSC 26. It is a wireless zone. Also, I
The other terminal (Correspondent No.) that is connected to the P network 23 and performs packet communication with the MN 18
de: CN).

In Mobile-IP, an IP packet transfer function for a mobile terminal is realized by tunneling by encapsulating a packet by an agent. The agent includes an HA that manages the current location of the mobile terminal and an FA that manages the mobile terminal in the destination subnetwork.
There is. Regarding the operation of HA and FA during packet transfer,
It is shown below. HA: encapsulates an IP packet addressed to a mobile terminal, and
Transfer to FA: Extracts the original IP packet from the transferred packet and sends it to the mobile terminal. To realize the packet transfer function of the PHS packet communication system, an agent for transferring IP packets and a P
HS network interworking is required. For this reason, in this system, the agent is called B in order to simplify the interworking between the agent and the PHS network.
Place on SC. As a result, the IP network shown in FIG.
This IP packet transfer function can be realized without newly requiring IP packet routing information from A to BSC.

In order to realize the above-described packet transfer function and provide the mobility function, the system needs to have a mobility management function of the mobile terminal. In Mobile-IP, ICM
P (Internet Control Message)
e Protocol) Router Disc
Agent Advertisee which extends "overy"
The movement is detected using the ment / Solicitation and the registration is performed. It is not appropriate for the PHS packet communication system to broadcast Agent Advertisement, which is the present procedure, at regular intervals as IP packets from the viewpoint of effective use of the bandwidth of the wireless channel. Therefore, in the present system, location information is acquired using management information for movement by the PHS, and registration in Mobile-IP is performed using detection of movement across BSC as a trigger. As a result, the PS number (telephone number) of the mobile station and the I
It is possible not to have a direct association with the P address.

FIG. 2 shows a location registration sequence when the MN 18 moves from the foreign network 21 to the foreign network 22 while communicating with the CN 19 in the network configuration shown in FIG. Next, a position registration method in the PHS packet communication system shown in FIG. 1 will be described with reference to FIG.

In FIG. 2, at 100, the CN 19 receives the IP address.
Network 23, HA 10, FA 11, base station 14,
Packet communication is performed with the MN 18 via the mobile station 17. In 101, the mobile station 17 and the MN 18 move from the foreign network 21 to the foreign network 22.
Move to. At 102, the mobile station 17 performs handover by moving 101. At 103, the mobile station 17 is notified of the handover to the MN 18. At 104, the MN 18 detects movement between networks by knowing that the mobile station 17 has handed over.

Upon detecting the movement, the MN 18 transmits a location registration message 105 to the FA 12 using a communication channel. FIG. 13 shows the format of the Mobile-IP location registration message. The FA 12 having received the location registration message of 105,
6 is transferred. The HA 10 having received the location registration message of 106 performs location registration processing so that the MN 18 can perform packet communication even in the foreign network 22 of the movement destination, and then transmits a registration response message of 107. FIG. 14 shows a format of the registration response message of Mobile-IP. 107
FA12 that has received the registration response message by
8 is sent to the MN1 using the call channel.
8 and the MN 18 receives the registration response. The location registration is completed as described above, and at 109, the CN 19 is in packet communication with the MN 18 via the IP network 23, the HA 10, the FA 12, the base station 15, and the mobile station 17.

As described above, in this embodiment, when a mobile terminal MN such as a personal computer (PC) connected to a mobile station moves, or when a MN to which the function of a mobile station is added moves, a destination Manages the movement of the terminal in the network, removes the IP header encapsulated in the IP header including the IP address, and passes the IP packet to the MN, and manages the movement of the MN in the network where the MN originally exists And when moving
To allow P-packet transfer, the assigned I
In a PHS packet communication network system having a home agent for managing a P address and receiving an IP packet addressed to the moved MN and encapsulating it with an IP header including an IP address assigned to the MN, the MN performs packet communication. When the mobile station moves inward, the MN performs location registration with the HA or the FA, triggered by a handover of the mobile station.

With the above-described configuration, the PHS packet communication system is provided with an IETF (Internet Engi).
nearing Task Force) Mobil
The application of e-IP becomes possible. That is, in the PHS packet communication system, movement can be hidden from the user of the mobile terminal, and communication can be performed without changing the IP address assigned to the mobile terminal in the destination network. The feature of this system is that the movement of the mobile station 17 triggers the M
This is to detect the movement of N. Therefore, there is no need to transmit the message periodically, and the wireless channel can be used effectively.

Embodiment 2 FIG. FIG. 3 shows a position where the mobile station 17 moves from the foreign network 21 to the foreign network 22 in a state where the power of the mobile station 17 is ON and the MN 18 is not performing communication in the network configuration shown in FIG. It shows a registration sequence.

At 200 in FIG. 3, the mobile stations 17 and M
N18 moves from the foreign network 21 to the foreign network 22. At 201, the mobile station 17 knows that it has moved in its own wireless zone, and performs location registration as a mobile station with the base station 15 (or base station 16). In 202, the mobile station 17 notifies the MN 18 that the mobile station 17 has performed location registration.
At 203, the MN 18 establishes a connection with the connected mobile station 17
Knows that a new location registration has been made, it detects that it has moved between networks.

The MN 18 that has detected the movement transmits a location registration message of 204 to the FA 12 of the movement destination network using the communication channel. The FA 12 that has received the location registration message 204 transfers the location registration message 205 to the HA 10. 205
HA 10 receiving the location registration message of MN 18
Sends a registration response message 206 to the FA 12 after performing location registration processing so that packet communication can be performed in the destination foreign network 22. The FA 12 that has received the registration response message by 206 transmits the registration response message of 207 to the MN 18 using the communication channel, and the MN 18 receives the registration response message. As described above, the location registration is completed at 208 and the MN 18
Can perform packet communication.

Embodiment 3 FIG. 4 shows that the MN 18 moves from the foreign network 21 to the foreign network 22 in the network configuration shown in FIG.
FIG. 9 shows a location registration sequence in a case where location registration is performed using a control channel for transmitting and receiving a location registration message. In the figure, the dashed arrows indicate the communication of the location registration message using the control channel.

At 300 in FIG. 4, mobile stations 17 and M
N18 moves from the foreign network 21 to the foreign network 22. At 301, the mobile station 17 knows that it has moved in its own wireless zone, and performs location registration as a mobile station. At 302, mobile station 1
7 notifies the MN 18 that the mobile station 17 has performed location registration. In 303, the MN 18 detects that it has moved by knowing that the connected mobile station 17 has performed location registration.

The MN 18 that has detected the movement transmits a location registration message 304 to the FA 12 of the movement destination network using the control channel. The FA 12 that has received the location registration message 304 transfers the location registration message 305 to the HA 10. 305
HA 10 receiving the location registration message of MN 18
Sends a registration response message 306 to the FA 12 after performing location registration processing so that packet communication can be performed in the destination foreign network 22. The FA 12 that has received the registration response message by 306 transmits the registration response message of 307 to the MN 18 using the control channel, and the MN 18 receives the registration response message. As described above, at 308, the location registration is completed, and the MN 18
Can perform packet communication.

Embodiment 4 FIG. 5 shows that in the network configuration shown in FIG. 1, the MN 18 moves from the foreign network 21 to the foreign network 22,
The MN indicates a location registration sequence when a movement is detected from information broadcast from the base station to the mobile station using the control channel. Here, in the broadcast information broadcast from the base station to the mobile station, there is a CS-ID which is an identifier of the base station. FIG. 6 shows a correspondence table of CS-IDs assigned to base stations 13 to 16. 6, for example, the base station 14 is assigned “1100” as the CS-ID, and the base station 15 is assigned “1200”.

At 400 in FIG. 5, information is broadcast from the base station 14 to the mobile station 17. The broadcast information includes the CS-ID of the base station 14, and its value is "1100" from FIG. At 401, mobile station 1
7 indicates to the MN 18 the CS-I of the currently existing zone.
Notify that D is “1100”. At 402,
The mobile station 17 and the MN 18 are connected to the foreign network 2
1 to the foreign network 22. 403
In, the mobile station 17 receives the broadcast information from the base station 15 and acquires the CS-ID “1200” of the base station 15. In 404, the mobile station 17 notifies the MN 18 that the CS-ID of the currently existing zone is “1200”. Due to the change of CS-ID, 4
At 05, the MN 18 detects movement between networks.

The MN 18 is the FA1 of the destination network.
A location registration message of 406 is transmitted to 2 using the control channel. The FA 12 that has received the location registration message of 406 sends the location registration message of 407 to the HA1.
Transfer to 0. The HA 10 receiving the location registration message of 407 performs location registration processing so that the MN 18 can perform packet communication even in the foreign network 22 of the movement destination, and then sends the registration response message of 408 to the FA 12.
Send to F that has received the registration response message 408
A12 transmits the registration response message 409 to the MN 18 using the control channel, and the MN 18 receives the registration response message. As described above, the location registration is completed in 410, and the MN 18 can perform packet communication.

Embodiment 5 FIG. FIG. 7 shows that in the network configuration shown in FIG. 1, the MN 18 is present in the foreign network 22, and the base station notifies the mobile station of information used for location registration using a control channel, and the information is used at the time of location registration. 9 shows a location registration sequence in the case. The IP addresses of the HA and the FA are defined in the information notified from the base station to the mobile station. FIG.
2 shows a correspondence table of IP addresses assigned to the HA 10 and the FAs 11 and 12. From FIG. 8, for example, the FA 11 has “133.142.11.1” as the IP address.
Is assigned to the FA 12, and “133.143.2.11” is assigned to the FA 12 as an IP address.

At 500 in FIG. 7, information used for location registration is broadcast from the base station 15 to the mobile station 17. The broadcast information includes the IP address of the FA 12, and the value is “133.143.12.
1 ". In 501, the mobile station 17
8 for the FA of the existing network
Notify that the P address is “133.143.2.11”. The MN 18 uses the IP address “133.143.2.11” acquired at 501 as the care-of address (Care-of Addr) of the location registration message in FIG.
ess), and transmits a location registration message 502 to the FA 12 using the control channel. The FA 12 that has received the position registration message 502 transfers the position registration message 503 to the HA 10. 503
HA 10 receiving the location registration message of MN 18
Sends a registration response message 504 to the FA 12 after performing location registration processing so that packet communication can be performed in the destination foreign network 22. The FA 12 that has received the registration response message by 504 transmits the registration response message of 505 to the MN 18 using the control channel, and the MN 18 receives the registration response message. As described above, the location registration is completed at 506 and the MN 18
Can perform packet communication.

Embodiment 6 FIG. FIG. 9 shows that the MN 18 moves from the foreign network 21 to the foreign network 22 in the network configuration shown in FIG.
FIG. 9 shows a location registration sequence in a case where information used for location registration is reported from a base station to a mobile station using a control channel.

At 600 in FIG. 9, information used for location registration is broadcast from the base station 14 to the mobile station 17. The broadcast information includes the IP address of the FA 11 and its value is “133.1421.1.1.”
In 601, the mobile station 17 sends to the MN 18 an F with the current IP address “133.142.11.1”.
It notifies that it exists in the area of A11.

At 602, the mobile station 17 and the MN 18
Moves from the foreign network 21 to the foreign network 22. In 603, the above 600
Similarly to the above, information used for location registration is broadcast from the base station 15 to the mobile station 17 using the control channel. The broadcast information includes the IP address of the FA 12, and its value is “133.143.2.11”.
In 601, the mobile station 17 notifies the MN 18 that the mobile station 17 is currently in the area of the FA 12 whose IP address is “133.143.2.11”. 60
5, the MN 18 changes the IP address of the FA from “133.142.11.1” to “133.143.
12.1 ”, it is detected that the network has moved from the foreign network 21 to the foreign network 22. At 606, the MN 18 detects that the network has been moved to a network managed by a different agent. Is determined to be necessary.

The determination of the necessity of the location registration in 606 can be applied to each of the embodiments described above. MN 18 is base station 1
5 from the wireless zone of the base station 16 to the wireless zone of the base station 16, that is, even if a handover is performed, a location is registered, or the CS-ID is changed,
If the P address remains “133.143.2.11”, it can be determined that there is no need to perform location registration. As described above, the movement detection of the mobile station 17 is directly performed by the MN.
18 may not be detected. That is, the detection of the movement of the mobile station 17 and the detection of the movement of the MN 18 are separated from each other, and the detection of the movement of the mobile station 17 is used as a trigger.
Will be separately detected.

The MN 18 uses the IP address “133.143.2.11” acquired at 604 as the care-of address (Care-of Addr) of the location registration message in FIG.
ess), and transmits a location registration message 607 to the FA 12 using the control channel. The FA 12 that has received the location registration message 607 transfers the location registration message 608 to the HA 10. 608
HA 10 receiving the location registration message of MN 18
Sends a registration response message 609 to the FA 12 after performing location registration processing so that packet communication can be performed in the destination foreign network 22. The FA 12 that has received the registration response message 609 transmits the registration response message 610 to the MN 18 using the control channel, and the MN 18 receives the registration response message. As described above, in 611, the location registration is completed, and the MN 18
Can perform packet communication.

Embodiment 7 FIG. 10 shows a case where, in the network configuration shown in FIG. 1, the MN 18 moves from the foreign network 21 to the foreign network 22, and the MN 18 determines the necessity of location registration based on information from an agent and then performs location registration. It shows a sequence.

At 700 in FIG. 10, the mobile station 17 and the MN 18 move from the foreign network 21 to the foreign network 22. At 701, mobile station 1
7 learns that he has moved through his wireless zone,
Performs location registration as a mobile station. In 702, the mobile station 17 notifies the MN 18 that the mobile station 17 has performed location registration. In 703, the MN 18 detects that it has moved by knowing that the connected mobile station 17 has performed location registration.

The MN 18 that has detected the movement sends the FA 704 to the FA 12 in the format shown in FIG.
Send a Solicitation message. A
The Gen Solicitation message is A
This is a message requesting the issuance of a “gen. Solicitation” message. 704 AgentSo
FA12 that received the licitation message
Is an Agent of 705 in the format shown in FIG.
Send an Advertisement message. 7
At 06, the MN 18 sends the 705 Agent Ad
The necessity of location registration is determined based on the information of the verification message. If location registration is required, MN1
8 transmits the location registration message of 707 to the FA 12 using the control channel. The FA 12 that has received the location registration message of 707 transfers the location registration message to the HA 10 in 708. The HA 10 that has received the location registration message 708 performs location registration processing so that the MN 18 can perform packet communication even in the foreign network 22 of the movement destination, and then transmits a registration response message 709 to the FA 12. The FA 12 that has received the registration response message according to 709 transmits a registration response message 710 to the MN 18 using the control channel,
The MN 18 receives the registration response message. At the time of 711, the MN 18 completes the location registration, and the MN 18 can perform packet communication.

[0043]

According to the present invention, the information from the mobile station is used as a trigger to detect the movement of the MN, so that H
It is possible to solve the problem of message broadcasting between the A and FA and the MN, and it is possible to effectively use radio resources.

Further, when the MN moves during packet communication, the MN becomes the HA,
Alternatively, location registration can be performed with the FA.

Also, when the MN moves other than during communication,
The MN can perform location registration with the HA or the FA, triggered by the location registration processing of the mobile station.

Further, the MN detects the movement from the base station ID in the position information broadcast on the control channel, and the MN can perform position registration with the HA or the FA.

Further, information used for the location registration processing is broadcast on the control channel, and the MN uses the broadcast information to transmit HA,
Alternatively, location registration can be performed with the FA.

Further, by using a control channel instead of a communication channel for location registration, the communication channel can be effectively used, and the throughput of user data can be increased.

By determining the necessity of the location registration from the information of the control channel when performing the location registration, there is an effect that unnecessary location registration can be avoided.

By determining the necessity of the location registration from the information of the agent when performing the location registration, there is an effect that unnecessary location registration can be avoided.

Further, according to the present invention, there is an effect that the IETF Mobile-IP can be applied to the PHS network.

[Brief description of the drawings]

FIG. 1 is a network configuration diagram of a PHS packet communication system according to the present invention.

FIG. 2 is a diagram showing a location registration sequence according to Embodiment 1 of the present invention.

FIG. 3 is a diagram showing a location registration sequence according to Embodiment 2 of the present invention.

FIG. 4 is a diagram showing a location registration sequence according to Embodiment 3 of the present invention.

FIG. 5 is a diagram showing a location registration sequence according to Embodiment 4 of the present invention.

FIG. 6 shows a base station and C according to Embodiment 4 of the present invention.
It is a figure showing the correspondence table of S-ID.

FIG. 7 is a diagram showing a location registration sequence according to Embodiment 5 of the present invention.

FIG. 8 shows an Agent according to Embodiment 5 of the present invention.
FIG. 7 is a diagram showing a correspondence table between IP addresses of the Agent and the Agent.

FIG. 9 is a diagram showing a location registration sequence according to Embodiment 6 of the present invention.

FIG. 10 is a diagram showing a location registration sequence according to Embodiment 7 of the present invention.

FIG. 11 is a network configuration diagram in the conventional Mobile-IP.

FIG. 12 is a diagram showing a location registration sequence in the conventional Mobile-IP.

FIG. 13 is a diagram showing a location registration message format in Mobile-IP.

FIG. 14 is a diagram showing a registration response message format in Mobile-IP.

FIG. 15 Agent in Mobile-IP
It is a figure which shows an Advertisement message format.

FIG. 16: Agent in Mobile-IP
It is a figure which shows a Solicitation message format.

[Explanation of symbols]

10 HA (Home Agent), 11, 12 FA
(Foreign agent), 13-16 base stations, 1
7 mobile station, 18 MN (mobile terminal), 19CN, 20
Home network, 21, 22 foreign network, 23 IP network.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H04Q ^7/ 00-7/38 H04B ⁷ /24-7/26 102

Claims (9)

(57) [Claims] 1. A mobile terminal location registration method in a mobile communication system including a plurality of networks having an agent and a base station, a mobile station performing wireless communication with the base station, and a mobile terminal connected to the mobile station. In the mobile station,
The management information transmitted between the base station and the mobile station is transferred to the mobile terminal, and the mobile terminal detects movement of the mobile terminal between networks based on the transferred management information, and positions the mobile terminal with respect to the agent. A location registration method for a mobile terminal in a mobile communication system, wherein registration is performed. 2. The mobile terminal location registration method according to claim 1, wherein the management information is information indicating that a handover process of the mobile station has occurred. 3. The location registration method for a mobile terminal in a mobile communication system according to claim 1, wherein said management information is information indicating that location registration processing of a mobile station has occurred. 4. The location registration method for mobile terminals in a mobile communication system according to claim 1, wherein the management information is an identifier of the base station broadcast from the base station. 5. The management information according to claim 1, wherein the management information is information used for location registration notified from a base station.
A location registration method for a mobile terminal in the mobile communication system according to the above. 6. The mobile station according to claim 1, wherein the mobile station transmits a location registration message from the mobile terminal to an agent using a control channel to perform location registration of the mobile terminal. 3. A mobile terminal location registration method in a mobile communication system according to claim 1. 7. The mobile station transfers information broadcast on a control channel to the mobile terminal as management information, and the mobile terminal determines necessity of location registration based on the information broadcast on the control channel. Claims 1 to
6. A location registration method for a mobile terminal in the mobile communication system according to any one of 6. 8. The mobile terminal according to claim 1, wherein the mobile terminal determines the necessity of location registration by making an inquiry to a network agent. Location registration method. 9. The mobile communication system is a personal handy phone system (PHS) packet communication system.
ETF (Internet Engineering)
2. A location registration method for a mobile terminal in a mobile communication system according to claim 1, wherein the system is a system to which Mobile-IP of Task Force) is applied.