Mobile communication system with effective packet transmission and control method for the same

The present invention relates to a mobile communication system and a control method thereof for performing packet communication connected via the Internet.

PROBLEM TO BE SOLVED: In recent years, with the spread of the Internet, a mobile communication system for accessing the Internet from a mobile terminal has been studied. An example of such a mobile communication system is disclosed in Reference 1: "3GPP2 P.S001 version 1.0 Wireless IP Network Standard, Dec. 10, 1999". Here, the technique disclosed in Document 1 will be briefly described with reference to (A) of FIG.

As shown in FIG. 6A, the mobile communication system disclosed in Document 1 includes a radio base station (Node B; NB) 11 with which the mobile terminal 10 communicates via a radio line, and a radio base station (Node B; NB) 11 thereof. It is composed of a radio access network (RAN) including a radio network controller (RNC) 12 that controls a radio base station 11, a core network (CN) 15a, and the Internet 16. Has been done. This core network 15a is composed of a home agent (HA) 14a and a foreign agent (FA) 14b, and controls calls to the mobile terminal 10.

[0004] In this mobile communication system, the communication of the core network 15a and the Internet 16 is controlled by the mobile IP (mobile IP), which is being studied by the IETF, respectively. Mobile IP is a movement control method studied by the IETF (Internet Engineering Task Force), and is disclosed in, for example, Reference 2: "IETF RFC 2002, CEPerkins, IPv4 Mobility Support, Oct. 1996".

[0005] Then, in order to realize the control by the mobile IP, the home agent (HA) 14a of the core network 15a is installed in the home domain of the mobile terminal 10. Then, HA14a once receives the packet signal transmitted to the mobile terminal by the communication partner of the mobile terminal 10, and transfers the packet signal to the mobile terminal 10 at the current position via the foreign agent (FA) 14b.

[0006] Further, the FA14b detects that the mobile terminal 10 has moved into the domain managed by the FA14b, and the FA14b is set against the HA14a installed in the own area of the mobile terminal 10. Notifies that the mobile terminal 10 has moved within the managed area.

[0007] On the other hand, communication between the FA 14b of the core network 15a and the mobile terminal 10 is controlled by a circuit-switched connection. In this circuit-switched connection, a fixed band is allocated to each mobile terminal in advance for communication.

[0008] Another example of a mobile communication system is disclosed in Document 3: "3GPP TR23.923 version 1.0.0 Combined GSM and MobileIP Mobility Handling in UMTS IP CN, Oct. 06, 1999". Here, the technique disclosed in Document 3 will be briefly described with reference to FIG. 6B.

As shown in FIG. 6B, in the mobile communication system disclosed in Document 3, the communication of the Internet 16 is controlled by the mobile IP. On the other hand, communication between the core network (CN) 15b and the wireless line control station 12 is controlled by GTP (GPRS Tunneling Protocol), which is a mobile control method peculiar to mobile communication systems.

[0010] However, in the technique disclosed in Document 1 above, circuit-switched connection is performed. Therefore, there is a problem that the mobile terminal occupies the communication band even when the mobile terminal does not send / receive data.

[0011] Further, in the technique disclosed in Document 3 above, a control method peculiar to the mobile communication system is used in the core network. For this reason, there is a problem that the communication protocol becomes redundant, the communication overhead increases, and the network configuration is restricted.

[0012] The present invention has been made to solve the above problems, and is a mobile communication system capable of realizing efficient transmission of packet data in a core network and a mobile communication system thereof. The purpose is to provide a control method.

[Means for Solving the Problem] The means for solving the problem is expressed as follows. Technical matters appearing in the expression are accompanied by numbers, symbols, etc. in parentheses (). The numbers, symbols, etc. are technical matters constituting at least one embodiment of the plurality of embodiments of the present invention, particularly technical matters represented in the drawings corresponding to the embodiments. It matches the reference number, reference symbol, etc. attached to. Such reference numbers and reference symbols clarify the correspondence / bridge between the technical matters described in the claims and the technical matters of the embodiment. Such correspondence / bridging does not mean that the technical matters described in the claims are construed as being limited to the technical matters of the embodiment.

[0014] The mobile communication system according to the present invention includes a mobile terminal (10), a radio access network (13), and a core network (15) that controls calls to the mobile terminal (10). The radio access network (13) includes a radio base station (11) in which a mobile terminal (10) performs packet communication via a radio line, and a radio line control station (12) that controls the radio base station (11). .. At this time, packet communication between the mobile terminal (10) and the wireless line control station is controlled by wireless line control by packet switching connection. Furthermore, for packet communication from the core network (15) and the core network (15) to the wireless line control station (12), the mobile terminal (10) registers the current position of its own station with the home agent (14) according to the movement. However, when the home agent (14) receives the packet data addressed to the mobile terminal (10), it transfers the packet data addressed to the mobile terminal (10) to the registered current position (Mobile Internet). Controlled by protocol).

[0015] With such a configuration, since wireless line control is performed by packet switching connection, a unified multiplex effect can be obtained in which a plurality of mobile terminals (10) can use the same communication band. Therefore, it is possible to prevent the line from being unnecessarily occupied. Furthermore, Mobile IP, which is a control method used on the Internet, has been introduced not only for communication from the core network (15) but also to the wireless line control station (12) of the wireless access network (13). As a result, efficient transmission of packet data in the core network (15) can be realized.

[0016] At this time, the home agent (14) can be provided in the core network (15).

[0017] Further, the home agent (14) may be provided on the Internet (16) connecting the radio access networks (13) to each other.

[0018] Further, the home agent (14) may be provided in the radio access network (13).

[0019] In the mobile communication system, the current position of the mobile terminal (10) preferably indicates which of the radio base stations (11) the mobile terminal (10) is connected to.

Further, in the mobile communication system described above, the home agent (14) has a registration unit (not shown) for registering the current position of the mobile terminal (10) and packet data (PD10, 20, 20) received from the communication partner. 30) is encapsulated to generate encapsulated packet data (PD11, 21, 31) destined for the current position of the mobile terminal (10) registered in the registration unit, and encapsulated packet data (PD11, 21, 31). It is preferable to include an IP module that transmits 31) to the mobile terminal (10) (see FIG. 1).

[0021] At this time, it is preferable that the mobile terminal (10) includes an IP module (not shown) that decapsulates the encapsulated packet data (PD11, 21) and extracts the packet data (PD10, 20).

[0022] Further, the wireless line control station (12) decapsulates the encapsulated packet data (PD31), extracts the packet data (PD30), and transfers the packet data (PD30) to the mobile terminal (10). It is preferable to include a module (not shown).

Further, in the mobile communication system, the mobile terminal (10) includes a radio line control module (not shown) that transmits position information indicating the current position, and the radio line control station (12) has the position information. Is received, converted into a wireless line control registration signal as a control signal peculiar to the radio access network, and transmitted to the home agent (14), and the home agent (14) moves based on the RRC registration signal. The current position of the terminal (10) may be registered in the registration unit (not shown).

[0024] In the mobile communication system, the mobile terminal (10) may include a mobile IP module (not shown) that transmits position information indicating its current position.

Further, in the mobile communication system, the wireless line control station (12) transmits a position control notification signal to the mobile terminal (10), and the mobile terminal (10) responds to the position control notification signal. , May transmit location information indicating its current location.

[0026] The control method of the mobile communication system according to the present invention is (a) the position information for registering the current position of the mobile terminal (10) via the wireless line control station (12) to the core network (15). It includes a step of transmitting to the home agent (14) included in the above, and (b) registering the current position of the mobile terminal (10) with the home agent (14) based on the position information.

[0027] At this time, the control method of the mobile communication system may further include (c) establishing a line between the mobile terminal (10) and the wireless line control station (12). At this time, in step (a), the position information indicating the current position of the mobile terminal (10) is included in the core network (15) via the wireless line control station (12) using the established line. May include steps to send to the home agent (14).

Further, (a) step includes (d) position information indicating the current position of the mobile terminal (10) by the mobile terminal (10), including the mobile terminal (10) and the radio line control station (12). The steps of converting to a control signal peculiar to the radio access network (13), (e) transmitting the control signal to the radio line control station (12), and (f) reproducing the position information from the control signal. , (G) may include a step of transmitting the regenerated location information to the home agent (14).

[0029] Further, (a) steps are (h) a step of transmitting a control signal indicating position information indicating the current position of the mobile terminal (10) to the wireless line control station (12), and (i) the control signal. Is converted into location information by the wireless line control station (12), and (j) the converted location information may be transmitted to the home agent (14).

[0030] Further, the step (a) may be performed in response to the position control notification signal transmitted from the wireless line control station (12).

Further, in the control method of the mobile communication system, the communication between the mobile terminal (10) and the wireless line control station (12) is controlled by the wireless line control by the packet switching connection, and the home agent (14). Communication between and the wireless line control station (12) is preferably controlled by mobile IP.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment] First, with reference to FIG. 1, in the first embodiment, a basic configuration of a mobile communication system will be described. As shown in FIG. 1, the mobile communication system of the first embodiment includes a mobile terminal 10, a radio base station (NB) 11 with which the mobile terminal 10 communicates via a radio line, and the radio base station 11. It is composed of a radio access network (RAN) 13 including a radio line control station (RNC) 12 to be controlled, a core network (CN) 15, and an Internet 16. This core network 15 is composed of a home agent (HA) 14 and controls calls to the mobile terminal 10.

[0033] In this mobile communication system, packet communication in the wireless success network 13 between the mobile terminal 10 and the wireless line control station 12 is controlled by wireless line control by packet switching connection. As a result, a unified multiplex effect can be obtained in which a plurality of mobile terminals 10 can use the same communication band. Therefore, it is possible to prevent the line from being unnecessarily occupied.

[0034] Further, in this mobile communication system, packet communication from the Internet 16, the core network 15, and the core network 15 to the wireless line control station 12 is controlled by mobile IPv6. As a result, efficient transmission of packet data in the core network can be realized.

[0035] Then, in order to realize the control by this mobile IP, the home agent (HA) 14a of the core network 15a stores the current position of the mobile terminal 10, once receives the packet data addressed to the mobile terminal 10, and then receives the packet data. The packet data is transferred to the current position.

Next, with reference to FIG. 2, a configuration example of a mobile communication system that is closer to reality, including the basic configuration shown in FIG. 1, will be described. FIG. 2 shows a configuration example of a mobile communication system in which network configurations constructed by two telecommunications carriers Operator A and Operator B are connected to each other via the Internet 160.

[0037] Further, FIG. 2 shows two radio access networks 130 and 131 in the network configuration constructed by "Operator A". Also, in the network configuration constructed by "Operator B", two radio access networks 132 and 133 are shown. The radio access networks 132 and 133 are connected to the Internet 160 via the core network 150.

[0038] Therefore, the network configuration constructed by "Operator B" corresponds to the basic configuration shown in FIG. That is, the mobile terminal 10 of FIG. 1 corresponds to the mobile terminals 102 and 103 of FIG. 2, and the radio base station 11 of FIG. 1 corresponds to the radio base stations 112 and 113 of FIG. Further, the wireless line control station 12 in FIG. 1 corresponds to the wireless line control stations 122 and 123 in FIG. 2, and HA14 in FIG. 1 corresponds to HA141 in FIG. Further, the core network 15 in FIG. 1 corresponds to the core network 150 in FIG.

[0039] On the other hand, in the network configuration constructed by "Operator A", although the radio access networks 130 and 131 correspond to the radio access network 13 shown in FIG. 1, the configuration of the independent core network is not exist. That is, the function of the core network is realized by the home agent (HA) 140 on the Internet 16. That is, HA140 controls the calls of mobile terminals 100 and 101.

[0040] As described above, the reason why the configuration of the independent core network can be omitted is that the mobile IPv6 is used not only for the core network but also for the communication of the radio line control stations 120 to 123 of the radio access network 130 to 133. This is because it has been introduced. That is, packet communication between the wireless line control stations 120 and 121 on the "Operator A" side and the wireless line control stations 122 and 123 on the "Operator B" side is controlled by mobile IPv6. The core network function can also be realized on an Internet service provider (ISP).

[0041] As described above, if the Internet 16 also functions as a core network and adopts a network configuration in which the configuration of an independent core network is omitted, more efficient transmission of packet data can be realized. Even in the network configuration of "Operator B", the configuration of the core network 15 can be omitted by realizing the function of the core network on the Internet.

Next, an example of the operation flow of the mobile communication system shown in FIG. 1 will be described with reference to FIG. In the first embodiment, the mobile terminal (UE) 10 has a mobile IP function, that is, has a mobile IP module (MIP), and the signal generated in accordance with the mobile IP is not converted. It is expected that it will be transmitted.

As shown in FIG. 3, the current position of the mobile terminal (UE) 10 is registered in HA14 of the core network 15 prior to the execution of packet communication. Which of the plurality of wireless base stations 11 the mobile terminal (UE) 10 to be registered is connected to is registered as the current position.

[0044] In registration, first, the mobile IP module (MIP) (not shown) in the mobile terminal (UE) 10 transmits a registration signal to the home agent (HA) 14 (step S100). The registration signal indicates the current position of the mobile terminal 10. As the registration signal, "Registration Request" (for mobile IPv4) or "Binging Update" (for mobile IPv6) is used. Upon receiving the registration signal, the mobile IP module (MIP) (not shown) in HA14 registers the current position indicated by the registration signal as a transfer destination of packet data addressed to the mobile terminal 10 (step S101).

Next, the mobile IP module (MIP) in HA14 transmits a registration confirmation signal to the mobile terminal (UE) 10 (step S102). Then, when the mobile IP module (MIP) in the mobile terminal (UE) 10 receives the registration confirmation signal, the location registration is completed.

[0046] FIGS. 11 (a) to 11 (d) show a protocol stack for transmission of the registration signal and the registration confirmation signal exchanged as described above.

Next, control when transmitting packet data from the communication partner (Co.Node) to the mobile terminal (UE) 10 will be described. First, the communication partner (Co.Node) transmits packet data (PD10) destined for the mobile terminal (UE) 10 to HA14 (step S103).

[0048] The IP module (IP) (not shown) of HA14 that has received the packet data (PD10) encapsulates the packet data (PD10) and generates the packet data (PD11) (step S104). Here, encapsulation means creating a new packet with all parts of the sent packet data as the user data part and the IP address registered by the above-mentioned registration signal as the destination described in the header part. To say. In step S104, in the IP module (IP) of HA14, all parts of the packet data (PD10) are stored in the user data part, and the IP address registered by the above-mentioned registration signal is described in the header-part as the destination. Packet data (PD11) is generated. Subsequently, the IP module (IP) of HA14 transmits the packet data (PD11) to the mobile terminal (UE) 10 (step S105).

The IP module (IP) (not shown) of the mobile terminal (UE) 10 that has received the packet data (PD11) decapsulates the packet data (PD11) and includes it in the packet data (PD11). Extract the packet data (PD10) that was stored (step S106). Here, decapsulation means taking out the packet embedded in the user data part in the packet. Subsequently, the IP module of the mobile terminal (UE) 10 transfers the extracted packet data (PD10) to the mobile IP module (MIP) in the UE 10 (step S107). Then, when the mobile IP module (MIP) in the UE10 receives the packet data (PD10), the packet data transmission process is completed.

[0050] The encapsulation / decapsulation described above can be achieved by using "IP Encapsulation within IP" (IETF RFC 2004). Further, in the section where mobile IPv6 is used for packet communication, such encapsulation / decapsulation can be realized by using an option header (Option Header).

[0051] Further, in the first embodiment, the encapsulation is performed in HA14, but the encapsulation can be performed in the communication partner (Co.Node).

[Second Embodiment] Next, with reference to FIG. 4, an operation flow and other examples in the mobile communication system shown in FIG. 1 will be described as the second embodiment. In the second embodiment, the mobile terminal (UE) 10 has a mobile IP function, that is, it has a mobile IP module (MIP), and a signal generated in accordance with the mobile IP is transmitted to the wireless access network. It is assumed that the control signal is converted into a unique control signal and transmitted. As shown in FIG. 4, the location of the current position of the mobile terminal (UE) 10 is registered in HA14 of the core network 15 prior to the execution of packet communication. Which of the plurality of wireless base stations 11 the mobile terminal (UE) 10 to be registered is connected to is registered as the current position.

[0053] In the location registration, first, the mobile IP module (MIP) (not shown) in the mobile terminal (UE) 10 sends the registration signal, which is the user data, to the wireless line control module (RRC) in the UE 10. ) (Not shown) (step S200). Upon receiving the registration signal, the radio line control module (RRC) converts the registration signal into an RRC registration signal as a control signal peculiar to the radio access network 13 (step S201). As the registration signal for RRC, "cell update / URA update" transmitted on CCCH (Common Control Channel) is used. Then, the radio line control module (RRC) transmits the registration signal for RRC to the radio line control station (RNC) 12 (step S202).

Upon receiving the RRC registration signal, the radio line control module (RRC) (not shown) in the RNC 12 converts the RRC registration signal into a registration signal as a mobile IP control signal (step S203). ). As the registration signal, the case of "Registration Request" (in the case of mobile IPv4) or "Binging Update" (in the case of mobile IPv6) is used. Subsequently, the radio line module (RRC) in the RNC12 transfers the registration signal to the mobile IP module (MIP) (not shown) in the RNC12 (step S204).

Subsequently, the mobile IP module (MIP) that has received the registration signal transmits the registration signal to HA14 (step S205). Upon receiving the registration signal, the mobile IP module (MIP) (not shown) in HA14 registers the current position indicated by the registration signal as a transfer destination of packet data addressed to the mobile terminal 10 (step S206).

Next, the mobile IP module (MIP) in HA14 transmits a registration confirmation signal to the wireless line control station (RNC) 12 (step S207). Upon receiving the registration confirmation signal, the mobile IP module (MIP) in the HA14 transfers the registration confirmation signal to the wireless line control module (RRC) in the HA14 (step S208).

The radio line control module (RRC) converts the received registration confirmation signal into an RRC registration confirmation signal as a control signal peculiar to the radio access network 13 (step S209). Then, the wireless line control module (RRC) transmits the registration confirmation signal for RRC to the mobile terminal (UE) 10 (step S210).

The wireless line control module (RRC) in the mobile terminal (UE) 10 that has received the RRC registration confirmation signal converts the RRC registration confirmation signal into a registration confirmation signal (step S211). Subsequently, the wireless line control module (RRC) in the UE 10 transfers the registration confirmation signal to the mobile IP module (MIP) in the UE 10 (step S212). Then, when the mobile IP module (MIP) in the mobile terminal (UE) 10 receives the registration confirmation signal, the location registration is completed.

[0059] FIGS. 12 (a) to 12 (d) show a protocol stack for transmission of the registration signal and the registration confirmation signal exchanged as described above.

[0060] As described above, in the second embodiment, in the location registration, the control specific to the radio access network 13 in the radio access network 13 between the mobile terminal (UE) 10 and the radio line control station (RNC) 12. The RRC registration signal and the RRC registration confirmation signal are exchanged as signals. Therefore, in the second embodiment, the mobile terminal (UE) 10 can perform the same processing as in the case of the fixed terminal. Further, since the wireless section is transmitted as a control signal peculiar to the wireless access network 13, the wireless line can be used efficiently.

[0061] Next, with reference to FIG. 5, an operation flow and other examples in the mobile communication system shown in FIG. 1 will be described as the third embodiment. In the third embodiment, the radio line control station (RNC) 12 has the function of mobile IP, that is, the mobile IP module (MIP), and the signal generated in accordance with the mobile IP is wireless access. It is assumed that the control signal is converted into a control signal peculiar to the network 13 and transmitted. As shown in FIG. 5, the location of the current position of the mobile terminal (UE) 10 is registered in HA14 of the core network 15 prior to the execution of packet communication. Which of the plurality of wireless base stations 11 the mobile terminal (UE) 10 to be registered is connected to is registered as the current position.

[0062] In the location registration, first, the radio line control module (RRC) (not shown) in the mobile terminal (UE) 10 transmits the registration signal for RRC as a control signal peculiar to the radio access network 13. Transmit to radio line control station (RNC) 12 (step S300).

[0063] The wireless line control module (RRC) (not shown) in the RNC 12 that has received the registration signal for RRC converts the registration signal for RRC into a registration signal that is user data as a control signal for mobile IP. (Step S301). As this registration signal, the case of "Registration Request" (in the case of mobile IPv4) or "Binging Update" (in the case of mobile IPv6) is used. Subsequently, the radio line module (RRC) in the RNC12 transfers the registration signal to the mobile IP module (MIP) (not shown) in the RNC12 (step S302).

[0064] The mobile IP module (MIP) that has received the registration signal transmits the registration signal to the home agent (HA) 14 (step S303). Upon receiving the registration signal, the HA14 mobile IP module (MIP) (not shown) registers the current position indicated by the registration signal as a transfer destination of packet data addressed to the mobile terminal 10 (step S304).

Next, the mobile IP module (MIP) in HA14 transmits a registration confirmation signal to the wireless line control station (RNC) 12 (step S305). Upon receiving the registration confirmation signal, the mobile IP module (MIP) in the HA14 transfers the registration confirmation signal to the wireless line control module (RRC) in the HA14 (step S306).

The radio line control module (RRC) in the HA 14 converts the received registration confirmation signal into an RRC registration confirmation signal as a control signal peculiar to the radio access network 13 (step S307). Subsequently, the wireless line control module (RRC) transmits the registration confirmation signal for RRC to the mobile terminal (UE) 10 (step S308). Then, in the third embodiment, the location registration is completed when the wireless line control module (RRC) in the mobile terminal (UE) 10 receives the registration confirmation signal for RRC.

[0067] FIGS. 13 (a) to 13 (d) show a protocol stack for transmission of the registration signal and the registration confirmation signal exchanged as described above.

[0068] As described above, in the third embodiment, the registration function of the mobile communication system itself is used for the location registration. That is, the RRC registration signal is transmitted from the wireless line control module (RRC) of the mobile terminal (UE) 10. As a result, the mobile terminal (UE) 10 does not need to register the location for the mobile IP. As a result, the control method of the present invention can be introduced into the mobile communication system without changing the standard of the wireless line in the wireless access network 13.

[0069] Next, control when transmitting packet data from the communication partner (Co.Node) to the mobile terminal (UE) 10 will be described. First, the communication partner (Co.Node) transmits packet data (PD20) destined for the mobile terminal (UE) 10 to HA14 (step S309).

The HA14 IP module (IP) (not shown) that has received the packet data (PD30) encapsulates the packet data (PD20) and generates the packet data (PD31) (step S310). Subsequently, in the third embodiment, the IP module (IP) of HA14 transmits the packet data (PD31) to the radio line control station (RNC) 12 (step S311).

The IP module (IP) (not shown) of the wireless line control station (RNC) 12 decapsulates the received packet data (PD31) and contains the packet contained in the packet data (PD31). Extract the data (PD30) (step S312). Subsequently, the IP module of the wireless line control station (RNC) 12 transmits the extracted packet data (PD30) to the mobile terminal (UE) 10 (step S313). Then, when the mobile IP module (MIP) of the mobile terminal (UE) 10 receives the packet data (PD30), the packet data transmission process is completed.

[Fourth Embodiment] Next, with reference to FIG. 8, another example of the operation flow in the mobile communication system shown in FIG. 1 will be described as the fourth embodiment. In the fourth embodiment, as in the first embodiment, the mobile terminal (UE) 10 has a mobile IP function, that is, has a mobile IP module (MIP) and is generated in accordance with the mobile IP. It is assumed that the signal is transmitted without being converted.

[0073] In the fourth embodiment described below, whether or not the registration signal can be transmitted is determined based on the position control notification signal transmitted from the wireless line control station (RNC) 12 to the mobile terminal (UE) 10. Therefore, it is different from the first to third embodiments described above.

[0074] In the fourth embodiment, the radio line control station (RNC) 12 transmits a position control notification signal to the mobile terminal (UE) 10 via the radio base station (NB) 11, and the mobile terminal (UE) 10 Request location registration to (step S99). As the position control notification signal, "agent advertisement" (in the case of mobile IPv4) or "router advertisement" (in the case of mobile IPv6) is used.

[0075] When the mobile terminal (UE) 10 receives the position control notification signal, the mobile terminal (UE) 10 registers the current position of the mobile terminal (UE) 10 in HA14 of the core network 15. Which of the plurality of wireless base stations 11 the mobile terminal (UE) 10 to be registered is connected to is registered as the current position.

[0076] In registration, first, the mobile IP module (MIP) (not shown) in the mobile terminal (UE) 10 transmits a registration signal to the home agent (HA) 14 (step S100). As this registration signal, the case of "Registration Request" (in the case of mobile IPv4) or "Binging Update" (in the case of mobile IPv6) is used. The registration signal indicates the current position of the mobile terminal 10. Upon receiving the registration signal, the mobile IP module (MIP) (not shown) in HA14 registers the current position indicated by the registration signal as a transfer destination of packet data addressed to the mobile terminal 10 (step S101).

Next, the mobile IP module (MIP) in HA14 transmits a registration confirmation signal to the mobile terminal (UE) 10 (step S102). Then, when the mobile IP module (MIP) in the mobile terminal (UE) 10 receives the registration confirmation signal, the location registration is completed.

[0078] The protocol stack for transmitting the registration signal and the registration confirmation signal exchanged as described above is the same as that of the first embodiment, and is shown in FIGS. 11 (a) to 11 (d). ing.

[0079] The transmission of packet data from the communication partner (Co.Node) to the mobile terminal (UE) 10 is performed in the same manner as in the first embodiment (steps S103 to S107).

[Fifth Embodiment] Next, with reference to FIG. 9, another example of the operation flow in the mobile communication system shown in FIG. 1 will be described as the fifth embodiment. In the fifth embodiment, as in the second embodiment, the mobile terminal (UE) 10 has a mobile IP function, that is, has a mobile IP module (MIP) and is generated in accordance with the mobile IP. It is assumed that the signal is converted into a control signal peculiar to the wireless access network 13 and transmitted.

[0081] In the fifth embodiment described below, whether or not the registration signal can be transmitted is determined based on the position control notification signal transmitted from the wireless line control station (RNC) 12 to the mobile terminal (UE) 10. Therefore, it is different from the first to third embodiments described above.

[0082] In the fifth embodiment, the radio line control module (RRC) of the radio line control station (RNC) 12 sends an RRC position control notification signal to the mobile terminal (UE) 10 via the radio base station (NB) 11. Is sent and the mobile terminal (UE) 10 is requested to register the location (step S197). The RRC position control notification signal is transmitted as a control signal peculiar to the radio access network 13. More specifically, as the position control notification signal for RRC, a System Information Block transmitted on BCCH (Broadcast Control CHannel) is used.

Subsequently, the wireless line control module (RRC) of the mobile terminal (UE) 10 receives the position control notification signal for RRC and converts it into the position control notification signal for mobile IP as the control signal for mobile IP (step). S198). As the position control notification signal for mobile IP, "Agent Advertisement" (in the case of mobile IPv4) or "Router Advertisement" (in the case of mobile IPv6) is used.

The mobile IP position control notification signal is transferred to the mobile IP module (MIP) of the mobile terminal (UE) 10 (step S199).

[0085] In response to the mobile IP position control notification signal, the position of the current position of the mobile terminal (UE) 10 is registered in HA14 of the core network 15. Which of the plurality of wireless base stations 11 the mobile terminal (UE) 10 to be registered is connected to is registered as the current position.

[0086] The operation of the location registration is the same as that of the second embodiment (steps S200 to S212), and the detailed description thereof is not given.

[0087] As described above, in the fifth embodiment, as in the second embodiment, in the location registration, the radio access network 13 between the mobile terminal (UE) 10 and the wireless line control station (RNC) 12 is used. The RRC registration signal and the RRC registration confirmation signal as control signals peculiar to the radio access network 13 are exchanged. Therefore, in the fifth embodiment, the mobile terminal (UE) 10 can perform the same processing as in the case of the fixed terminal. Further, since the wireless section is transmitted as a control signal peculiar to the wireless access network 13, the wireless line can be used efficiently.

[6th Embodiment] Next, with reference to FIG. 10, another example of the operation flow in the mobile communication system shown in FIG. 1 will be described as the sixth embodiment. In the sixth embodiment, as in the third embodiment, in the third embodiment, the radio line control station (RNC) 12 has a mobile IP function, that is, has a mobile IP module (MIP) and It is assumed that the signal generated in accordance with the mobile IP is converted into a control signal peculiar to the radio access network 13 and transmitted.

[0089] In the sixth embodiment, the mobile IP module (MIP) of the radio line control station (RNC) 12 creates a position control notification signal for mobile IP, and the radio inside the radio line control station (RNC) 12. Transfer to the line control module (RRC) (step S297). As the position control notification signal for mobile IP, "Agent Advertisement" (in the case of mobile IPv4) or "Router Advertisement" (in the case of mobile IPv6) is used.

[0090] The radio line control module (RRC) of the radio line control station (RNC) 12 that has received the mobile IP position control notification signal uses the mobile IP position control notification signal as a control signal unique to the radio access network 13. It is converted into the position control notification signal for RRC (step S298). As the position control notification signal for RRC, the System Information Block transmitted on BCCH (Broadcast Control CHannel) is used.

The radio line control module (RRC) of the radio line control station (RNC) 12 transmits the position control notification signal for RRC to the mobile terminal (UE) 10 (step S299).

[0092] In response to the position control notification signal for RRC, the position of the current position of the mobile terminal (UE) 10 is registered in HA14 of the core network 15. Which of the plurality of wireless base stations 11 the mobile terminal (UE) 10 to be registered is connected to is registered as the current position.

The operation of location registration is the same as that of the third embodiment (steps S300 to S312), and the detailed description thereof is not given.

[0094] In each of the first to sixth embodiments described above, the operation is described on the premise of the mobile communication system shown in FIG. 1, but other movements shown in FIG. 7 are described. Similar operations can be performed in a communication system. In the other mobile communication system shown in FIG. 7, the network of the telecommunications carrier "Operator A" and the network of the other telecommunications carrier "Operator B" are connected via the Internet 160. In addition, the network of another carrier "Operator C" is connected to the Internet 160.

[0095] The network configuration constructed by the telecommunications carrier "Operator C" shown in FIG. 7 corresponds to the basic configuration shown in FIG. In the radio access network 134 constructed by the telecommunications carrier "Operator C", the mobile terminal (UE) 10 in FIG. 2 corresponds to the mobile terminal 104 in FIG. The radio base station (NB) 11 of FIG. 2 corresponds to the radio base station 114 of FIG. The radio line control station (RCN) 12 in FIG. 2 corresponds to the radio line control station 124 in FIG. The home agent (HA) 14 in FIG. 2 corresponds to the home agent 142 in FIG. In addition, Core Network (CN) 15 supports wireless service provider sites (not shown) included in Internet 160. In this way, it is possible that the home agent 142 is inserted in the radio access network 134.

[0096] Further, in the above-described embodiment, an example in which the present invention is configured under specific conditions has been described, but the present invention can be modified in various ways. For example, in the above-described embodiment, an example in which the core network is controlled by mobile IPv6 as the mobile IP has been described, but the mobile IP is not limited to this in the present invention.

[Effects of the Invention] As described in detail above, according to the present invention, since wireless line control is performed by packet switching connection, a plurality of mobile terminals can use the same communication band. A unified multiple effect can be obtained. Therefore, it is possible to prevent the line from being unnecessarily occupied.

[0098] Further, in the present invention, mobile IP, which is a control method used on the Internet, is introduced not only for the core network but also for communication to the wireless line control station of the wireless access network. As a result, efficient transmission of packet data in the core network can be realized. In addition, the functions of the core network that controls calls can be realized on the existing Internet and Internet service providers (ISPs). That is, the Internet or an Internet service provider can also serve as the core network. As a result, it is possible to adopt a network configuration that omits the core network that connects the wireless access network. As a result, more efficient transmission of packet data can be realized.

BRIEF DESCRIPTION OF THE DRAWINGS [FIG. 1] FIG. 1 is a schematic diagram for explaining a basic configuration of a mobile communication system according to the first embodiment.

FIG. 2 is a schematic diagram of the mobile communication system of the first embodiment.

FIG. 3 is a sequence diagram for explaining a control method of the mobile communication system of the first embodiment.

FIG. 4 is a sequence diagram for explaining a control method of the mobile communication system of the second embodiment.

FIG. 5 is a sequence diagram for explaining a control method of the mobile communication system of the third embodiment.

6 (A) and 6 (B) are explanatory views of a conventional mobile communication system.

FIG. 7 is a schematic diagram illustrating a configuration of another mobile communication system according to the embodiment of the present invention.

FIG. 8 is a sequence diagram for explaining a control method of the mobile communication system according to the fourth embodiment.

FIG. 9 is a sequence diagram for explaining a control method of the mobile communication system according to the fifth embodiment.

FIG. 10 is a sequence diagram for explaining a control method of the mobile communication system of the sixth embodiment.

FIG. 11 shows the protocol stacks of the first and fourth embodiments.

FIG. 12 shows the protocol stacks of the second and fifth embodiments.

FIG. 13 shows the protocol stacks of the third and sixth embodiments.

[Code description] 10 Mobile terminal 11 Wireless base station (NB) 12 Wireless line control station (RNC) 13 Wireless access network 14 Home agent 14a PDGN (Packet Data GW Node) 14b PDSN (Packet Data Serving Node) 14c GGSN (GW) GPRS Support Node) 14d SGSN (Serving GPRS Support Node) 15, 15a, 15b Core Network 16 Internet