JP2010268320A - Base station and communication processing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce an installation cost, a power cost and a maintenance cost of a base station without roaming charges. <P>SOLUTION: Information is transmitted to show that the base station is connectable to networks of plural business entities. From a mobile terminal having received the information, the mobile terminal receives information containing a business entity code for identifying the business entity under a contract, and a connection between the business entity network of the received business entity code and the mobile terminal is established. Thereafter, a location registration for registering a position of the mobile terminal is required to the business entity network in which a connection with the mobile terminal is established. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a base station and a communication processing method for providing a mobile communication service to a mobile terminal.

  Conventionally, there are communication systems for providing mobile communication services to users of mobile terminals. As shown in FIG. 11, this communication system includes a carrier network including a radio network controller (RNC), a mobile terminal, and a base station. The base station includes a carrier network and a mobile terminal. Mobile communication services are provided by relaying communications between them.

  Specifically, as shown in FIG. 12, the base station relays broadcast information (see FIG. 13) for notifying that there is a base station to the mobile terminal. Then, the base station relays the signaling connection request (RRC ConnectionRequest) received from the mobile terminal to the operator's network as a response to the broadcast information. Following this, the base station allocates radio resources such as a unique control channel to the mobile terminal, and establishes a signaling connection, so-called RRC connection, between the mobile terminal and the operator's network. When the RRC connection is established, the base station receives a location registration request for registering in which radio zone the mobile terminal is located from the mobile terminal, and relays it to the operator's network. Then, the base station performs wireless communication processing such as call control using a terminal identification code issued to the mobile terminal from the network of the business operator that has performed location registration.

  In such mobile communications, in recent years, femtocell base stations for covering radio-insensitive zones of mobile terminals such as basements and higher floors have attracted attention. As shown in FIG. 14, the femtocell base station is installed in the same radio wave insensitive zone for each operator, and relays communication between the operator's network and the mobile terminal of the user who is contracting with the operator. To do.

  Further, as shown in FIGS. 15 and 16, the femtocell base station performs a roaming service of relaying communication between another operator's network and the mobile terminal of the user who is contracting with the operator. Sometimes.

JP 2004-312088 A JP 2006-5824 A

  By the way, the above-mentioned conventional femtocell base station has a problem that the installation cost, the power cost, and the maintenance cost of the base station are useless, and the operator or the user is burdened with a roaming fee. That is, since each operator installs each base station in the same radio wave insensitive zone, there is a waste of base station installation cost, power cost, and maintenance cost. In addition, when the roaming technology is used, waste of base station installation cost, power cost, and maintenance cost can be eliminated, but a burden of roaming charges is imposed on the operator or the user of the mobile terminal.

  Note that a router that merely relays communication between terminals (see, for example, Patent Documents 1 and 2) is not applicable to mobile communication because it cannot perform wireless communication processing in the first place.

  Therefore, the disclosed technology has been made to solve the above-described problems of the conventional technology, and can reduce the installation cost, power cost, and maintenance cost of the base station without burdening the roaming fee. An object is to provide a base station and a communication processing method.

  The disclosed base station receives broadcast information transmitted by the broadcast information transmitting unit and a broadcast information transmitting unit that transmits broadcast information for reporting that the base station can be connected to a network of a plurality of carriers. The mobile terminal receives information including a business operator code identifying the business operator with which the mobile terminal is contracted, and establishes a connection between the business operator network of the received business operator code and the mobile terminal. And a location registration requesting unit for requesting location registration for registering the location of the mobile terminal with respect to the network of the carrier established by the connection establishing unit with the mobile terminal. Have

  According to the disclosed base station, it is possible to reduce the installation cost, power cost, and maintenance cost of the base station without burdening roaming charges.

FIG. 1 is a diagram for explaining the outline of the communication system according to the embodiment. FIG. 2 is a diagram for explaining the format of the IMSI. FIG. 3 is a diagram for explaining TMSI and dedicated TMSI. FIG. 4 is a block diagram showing the configuration of the communication system. FIG. 5 is a diagram illustrating an example of information stored in the management table. FIG. 6 is a diagram for explaining a format of broadcast information. FIG. 7 is a flowchart showing the flow of location registration processing by the base station. FIG. 8 is a flowchart showing the flow of location registration processing by the mobile terminal. FIG. 9 is a flowchart showing the flow of location registration processing by the network of each business operator. FIG. 10 is a sequence diagram showing a flow of location registration processing by the network of the base station, the mobile terminal, and each operator. FIG. 11 is a diagram for explaining the prior art. FIG. 12 is a diagram for explaining the prior art. FIG. 13 is a diagram for explaining the prior art. FIG. 14 is a diagram for explaining the prior art. FIG. 15 is a diagram for explaining the prior art. FIG. 16 is a diagram for explaining the related art.

  Hereinafter, an embodiment of a base station and a communication processing method will be described. In the following example, a communication system including the base station disclosed in the present application will be described as an example of an embodiment of the base station disclosed in the present application.

  FIG. 1 is a diagram for explaining the outline of the communication system according to the embodiment. An outline of the communication system according to the embodiment is to provide a communication service to the user of the mobile terminal. The communication system according to the embodiment reduces the installation cost, the power cost, and the maintenance cost of the base station without particularly burdening roaming charges.

  That is, the base station of the communication system according to the embodiment is, for example, a femto base station installed in a radio wave insensitive zone of a mobile terminal, and is connected to a network of a plurality of operators as shown in FIG. This base station transmits to the mobile terminal broadcast information for notifying that the base station is connectable to a plurality of carriers' networks. Thereafter, the base station receives information (such as a connection request for signaling) including a provider code for identifying the provider with which the user is contracting from the mobile terminal as a response to the broadcast information. Here, the base station establishes a connection (such as a signaling connection) between the carrier network of the received carrier code and the mobile terminal, and the mobile terminal Requests location registration to register the location of.

  Thereafter, the base station stores the terminal identification code for identifying the mobile terminal paid out to the mobile terminal from the network of the business operator that has performed location registration, and the business operator code of the business operator that has performed location registration in association with each other. Store in the department. Then, the base station performs radio communication processing such as call control using the terminal identification code stored in the storage unit. For example, when a base station receives a call request from a mobile terminal, the base station identifies the operator with which the user is contracting using the terminal identification code included in the call request, and relays the call request to the operator's network. To do.

  As described above, the base station of the communication system according to the embodiment specifies a business operator with whom the user of the mobile terminal is contracting, and requests location registration from the business operator's network. Therefore, it is not necessary for each operator to install each base station in the same radio wave insensitive zone, and it is possible to reduce the installation cost, power cost, and maintenance cost of the base station. In addition, the base station of the communication system according to the embodiment directly relays information received from the mobile terminal to the network of the operator with which the user has a contract, so communication can be performed without burdening the operator or the user with roaming charges. It is possible to provide services.

[Key terms used in the examples]
FIG. 2 is a diagram for explaining the format of the IMSI. IMSI (International Mobile Subscriber Identity) is information that identifies a mobile terminal, a user of the mobile terminal, and a business operator with whom the user is contracting. The IMSI includes, for example, a mobile country code (MCC) and a mobile network code (MNC), which are business codes for identifying the business, as shown in FIG. The IMSI further includes a mobile terminal and a mobile subscriber identification number (MSIN) that identifies the user of the mobile terminal. Note that the operator code described below means MCC and MNC.

  FIG. 3 is a diagram for explaining TMSI and dedicated TMSI. TMSI (Temporary Mobile Subscriber Identity) is information paid out from a business in place of MSIN to identify a mobile terminal and a user of the mobile terminal. For example, TMSI is a value of 4 octets, that is, 32 bits, as shown in FIG. 3, and is information set in a VLR (Visitor Location Register) for managing the location of the mobile terminal. The TMSI is information converted from the dedicated TMSI by the base station when relayed from the mobile terminal to the operator's network.

  The dedicated TMSI is information temporarily given to each mobile terminal by the base station in order to identify the mobile terminal and the user of the mobile terminal. Also, as shown in FIG. 3, the information is converted from TMSI by the base station when relayed from the operator's network to the mobile terminal.

[Configuration of communication system]
(Base station 10)
FIG. 4 is a block diagram showing the configuration of the communication system. 4, the base station 10 includes an information storage unit 11, a management table storage unit 12, a base station wireless function unit 13, a base station wired function unit 14, a broadcast information generation unit 15, an IMSI / TMSI processing unit 16, A connection destination determination unit 17 and a base station control unit 18 are included.

  The information storage unit 11 stores an operator code that identifies each connectable operator. For example, in the configuration of the communication system illustrated in FIG. 4, the information storage unit 11 stores the operator codes of the operator A, the operator B, the operator C, and the operator D. The business operator code may be stored after terminating broadcast information received from each business operator's network, or may be stored when the base station 10 is installed.

  FIG. 5 is a diagram illustrating an example of information stored in the management table. The management table storage unit 12 stores a management table in which TMSI is associated with dedicated TMSI. Specifically, as shown in FIG. 5, the management table storage unit 12 stores the MSIN, TMSI, dedicated TMSI, and contracted company code in association with each mobile terminal 20.

  The base station wireless function unit 13 performs wireless communication with the mobile terminal 20. The base station wired function unit 14 performs wired communication with each operator's network.

  The broadcast information generation unit 15 generates broadcast information for reporting that the base station is connectable to a plurality of carriers' networks, and transmits the generated broadcast information to the mobile terminal 20. Specifically, every time broadcast information is received from the RNC of each carrier, the broadcast information generation unit 15 stores the carrier code included in the received broadcast information in the information storage unit 11 so that connection is established. Register operator codes for all possible operators. And the alerting | reporting information generation part 15 produces | generates alerting | reporting information at arbitrary timings.

  FIG. 6 is a diagram for explaining a format of broadcast information. Broadcast information (BCCH: Broadcast Control Channel) has blocks called MIB (Master Information Block) and SIB (System Information Block) as shown in FIG. The MIB has a block called PLMN (Public Land Mobile Network) Identity for storing the operator code.

  The broadcast information generation unit 15 includes broadcast information including a common code common to all carriers in the PLMN Identity (see (A) in FIG. 6), or broadcast information listing all the provider codes (in FIG. 6). (See (B)) is generated and transmitted to the mobile terminal 20.

  When receiving the RRC Connection Request from the mobile terminal 20, the IMSI / TMSI processing unit 16 extracts the IMSI from the received RRC Connection Request. The RRC connection request is also called a signaling connection request, and is a signal for requesting the operator's network to allocate radio resources that can be used independently by the mobile terminal 20. Further, when receiving the Attach Accept from the operator's network, the IMSI / TMSI processing unit 16 extracts the TMSI from the Attach Accept and generates a dedicated TMSI corresponding to the extracted TMSI. Attach Accept is a signal for notifying the mobile terminal 20 that location registration has been completed.

  After generating the dedicated TMSI, the IMSI / TMSI processing unit 16 stores the extracted TMSI and the generated dedicated TMSI in the management table in association with the IMSI. Then, the IMSI / TMSI processing unit 16 transmits an Attach Accept including the generated dedicated TMSI to the mobile terminal 20.

  The connection destination determination unit 17 specifies the business operator that the user is contracting with, based on the business operator code included in the IMSI. Following this, the connection destination determination unit 17 associates the business operator code of the identified business operator with the MSIN and stores it in the management table. Then, the connection destination determination unit 17 relays the RRC Connection Request to the identified operator network. For example, the connection destination determination unit 17 relays the RRC Connection Request to the network of the operator A when the operator code of the operator A is included in the IMSI.

  In addition, when receiving a location registration request (Attach Request) from the mobile terminal 20, the connection destination determination unit 17 extracts the MSIN from the Attach Request and reads the business operator code corresponding to the extracted MSIN from the information storage unit 11. Then, the connection destination determination unit 17 relays the Attach Request to the network corresponding to the read business operator code.

  The base station control unit 18 controls various processes performed by the base station 10. Specifically, when receiving the RRC Connection Setup from the operator's network, the base station control unit 18 relays the RRC Connection Setup as it is to the mobile terminal 20 that has transmitted the RRC Connection Request. The RRC connection setup is information for notifying the mobile terminal 20 that the assignment of radio resources has been completed.

  Further, when receiving the RRC Connection Setup Complete from the mobile terminal 20, the base station control unit 18 relays the RRC Connection Setup Complete as it is to the network of the carrier that has transmitted the RRC Connection Setup. Moreover, the base station control part 18 transmits RRC ConnectionRelease with respect to the mobile terminal 20 of the transmission origin of RRC Connection Request at arbitrary timings after transmission of Attach Accept.

  When the base station control unit 18 receives information related to the communication service from the mobile terminal 20, the base station control unit 18 reads the business operator code corresponding to the terminal identification code of the mobile terminal 20 from the management table, and the business operator of the read business operator code Relay received information to other networks. Specifically, when receiving a call request from the mobile terminal, the base station control unit 18 refers to the management table, converts the dedicated TMSI included in the call request received from the mobile terminal 20 to TMSI, The received information is relayed to the operator network with the corresponding operator code. When receiving information to be relayed from the operator's network to the mobile terminal, the base station control unit 18 converts the TMSI included in the received information into dedicated TMSI and relays it.

(Mobile terminal 20)
As shown in FIG. 2, the mobile terminal 20 includes a subscriber information storage unit 21, a terminal radio function unit 22, a notification information determination unit 23, and a terminal control unit 24.

  The subscriber information storage unit 21, the user, the mobile terminal 20, and various types of information related to the operator with whom the user is contracting are stored. The terminal wireless function unit 22 performs wireless communication with the base station 10.

  When the broadcast information determination unit 23 receives the broadcast information from the base station 10, the broadcast information determination unit 23 determines whether or not connection is possible via the base station 10 that is the transmission source of the broadcast information. For example, the notification information determination unit 23 determines that the connection is possible when the common information is included in the notification information.

  Further, the notification information determination unit 23 determines that the connection is possible even when the notification information includes the operator code of the operator with whom the user is contracting. On the other hand, the notification information determination unit 23 determines that connection is not possible when the notification information does not include the operator code of the operator with whom the user is contracting. When the notification information determination unit 23 determines that the connection is possible, the notification information determination unit 23 reads the IMSI from the subscriber information storage unit 21. Then, the broadcast information determination unit 23 transmits an RRC connection request including the read IMSI to the base station 10.

  The terminal control unit 24 controls various processes performed by the mobile terminal 20. Specifically, when receiving the RRC Connection Setup from the base station 10, the terminal control unit 24 transmits RRC Connection Setup Complete to the base station 10 that has transmitted the RRC Connection Setup. Further, the terminal control unit 24 transmits an Attach Request at an arbitrary timing after transmitting RRC Connection Setup Complete.

  Further, when receiving the Attach Accept from the base station 10, the terminal control unit 24 extracts a dedicated TMSI from the received Attach Accept. Then, the terminal control unit 24 stores the extracted dedicated TMSI in the subscriber information storage unit 21. In addition, when receiving the RRC ConnectionRelease from the base station 10, the terminal control unit 24 transmits RRC ConnectionRelease Complete to the base station 10 that has transmitted the RRC Connection Release.

  Further, when receiving a communication service, the terminal control unit 24 reads the dedicated TMSI from the subscriber information storage unit 21 and transmits information including the dedicated TMSI to the base station 10. Specifically, when requesting transmission, the terminal control unit 24 transmits a transmission request including dedicated TMSI to the base station 10.

(Network of each company)
Each operator's network is a network that includes a radio network controller (RNC) and a server that provides a communication service, and performs location registration processing of the mobile terminal 20 to provide a user with a contract. Provide communication services. Specifically, when receiving the RRC Connection Request, the network of each operator transmits RRC Connection Setup to the base station 10 that relayed the RRC Connection Request. Further, when receiving the Attach Request, each operator's network extracts the IMSI included in the Attach Request and performs the location registration process of the mobile terminal 20. Subsequently, the network of each operator transmits an Attach Accept including TMSI to the base station 10 that relayed the Attach Request.

  In addition, when the information regarding the communication service is received, the network of each business operator extracts TMSI from the received information and identifies the mobile terminal 20 that is the information transmission source. Then, when the location registration of the identified mobile terminal 20 has been completed, each operator's network provides a communication service to the mobile terminal 20. Specifically, upon receiving a call request, each operator's network searches for a mobile terminal to receive a call, and starts a call between the mobile terminal that requested the call and the searched mobile terminal.

[Processing by communication system]
(Base station 10)
FIG. 7 is a flowchart showing a flow of location registration processing by the base station 10. As shown in FIG. 7, when reaching the timing at which the notification information should be transmitted (Yes at Step S101), the notification information generation unit 15 generates the notification information and transmits it to the mobile terminal 20 (Step S102). Thereafter, the IMSI / TMSI processing unit 16 extracts the IMSI from the RRC Connection Request received from the mobile terminal 20 (step S103). Following this, the connection destination determination unit 17 identifies the business operator that the user is contracting with, based on the business operator code included in the IMSI (step S104). Following this, the connection destination determination unit 17 stores the carrier code, the MSIN and the management table (step S105), and relays the RRC Connection Request to the identified carrier network (step S106).

  Next, the base station control unit 18 relays the RRC Connection Setup received from the operator's network to the mobile terminal 20 (step S107), and the RRC Connection Setup Complete received from the mobile terminal 20 is relayed to the operator's network. (Step S108).

  Thereafter, the connection destination determination unit 17 reads out the business operator code corresponding to the MSIN included in the Attach Request received from the mobile terminal 20 from the information storage unit 11 (step S109), and the network corresponding to the read business operator code The Attach Request is relayed to (Step S110).

  The IMSI / TMSI processing unit 16 generates a dedicated TMSI corresponding to the TMSI included in the Attach Accept received from the provider's network (step S111), and stores the TMSI and the dedicated TMSI in association with each other in the management table. (Step S112). Following this, the IMSI / TMSI processing unit 16 transmits an Attach Accept including the dedicated TMSI to the mobile terminal 20 (step S113).

  And the base station control part 18 transmits RRC Connection Release with respect to the mobile terminal 20 at arbitrary timings (step S114).

(Mobile terminal 20)
FIG. 8 is a flowchart showing a flow of location registration processing by the mobile terminal 20. As shown in FIG. 8, when broadcast information is received from the base station 10 (Yes at Step S201), it is determined whether or not connection is possible via the base station 10 that is the transmission source of the broadcast information (Step S202). If it is determined that connection is possible (Yes at Step S202), the broadcast information determination unit 23 reads the IMSI (Step S203), and transmits an RRC Connection Request including the read IMSI to the base station 10 (Step S202). S204).

  Thereafter, when receiving RRC Connection Setup (Yes at Step S205), the terminal control unit 24 transmits RRC Connection Setup Complete (Step S206) and transmits an Attach Request (Step S207).

  When receiving the Attach Accept from the base station 10 (Yes at Step S208), the terminal control unit 24 stores the dedicated TMSI included in the Attach Accept in the subscriber information storage unit 21 (Step S209). And terminal control part 24 will transmit RRC ConnectionRelease Complete to base station 10, if RRC ConnectionRelease is received from base station 10 (Step S210 affirmation) (Step S211).

(Network of each company)
FIG. 9 is a flowchart showing the flow of location registration processing by the network of each business operator. As shown in FIG. 9, when the RRC Connection Request is received (Yes at Step S301), the network of each operator transmits RRC Connection Setup (Step S302). Thereafter, when the network of each operator receives an Attach Request (Yes at Step S303), the location registration process of the mobile terminal 20 is performed (Step S304), and an Attach Accept including TMSI is transmitted to the base station 10 ( Step S305).

(Base station 10, mobile terminal 20, network of each operator)
FIG. 10 is a sequence diagram showing a flow of location registration processing by the network of the base station 10, the mobile terminal 20, and each operator. As shown in FIG. 10, the base station 10 generates broadcast information (step S401) and transmits it to the mobile terminal 20 (step S402). When receiving the broadcast information, the mobile terminal 20 determines whether or not the connection is possible (step S403). If the connection is possible, the mobile terminal 20 reads the IMSI (step S404) and sends an RRC Connection Request including the IMSI. Transmit (step S405).

  When receiving the RRC Connection Request, the base station 10 extracts the IMSI (step S406), and identifies the operator under contract by the user based on the operator code included in the IMSI (step S407). Subsequently, the base station 10 stores the operator code and the MSIN in the management table (step S408), and relays the RRC Connection Request to the operator's network (step S409).

  Upon receiving the RRC Connection Request, the operator's network transmits RRC Connection Setup to the mobile terminal 20 via the base station 10 (Step S410).

  When receiving the RRC Connection Setup, the mobile terminal 20 transmits RRC Connection Setup Complete (Step S411) and transmits an Attach Request (Step S412).

  Upon receiving the Attach Request, the base station 10 reads out the business operator code corresponding to the MSIN included in the Attach Request (Step S413), and relays the Attach Request to the network corresponding to the read out business operator code (Step S414). ).

  Upon receiving the Attach Request, the operator's network performs location registration processing of the mobile terminal 20 (Step S415), and transmits Attach Accept including TMSI (Step S416).

  Upon receiving the Attach Accept, the base station 10 generates a dedicated TMSI (Step S417), associates the TMSI and the dedicated TMSI, stores them in the management table (Step S418), and attaches the Attach Accept including the dedicated TMSI to the mobile terminal. 20 (step S419). When receiving the Attach Accept, the mobile terminal 20 stores the dedicated TMSI in the subscriber information storage unit 21 (step S420).

  Then, the base station 10 transmits RRC Connection Release (step S421), and the mobile terminal 20 transmits RRC Connection Release Complete (step S422).

[Effect of Example]
As described above, according to the embodiment, the user of the mobile terminal 20 specifies a contracting business operator and requests location registration from the business operator's network. Therefore, it is not necessary for each operator to install each base station 10 in the same radio wave insensitive zone, and the installation cost, power cost, and maintenance cost of the base station 10 can be reduced.

  In addition, according to the embodiment, since the information received from the mobile terminal 20 is directly relayed to the network of the operator with which the user is contracting, the communication service is provided without burdening the operator or the user with a roaming fee. It is possible.

  In addition, according to the embodiment, since the base station 10 generates dedicated TMSI, even when the same TMSI is paid out to a plurality of mobile terminals 20, each mobile terminal 20 can be distinguished. Is possible.

(Communication processing method)
The base station 10 described in the above embodiment implements the following communication processing method.

  That is, the notification information transmission step (see step S102 in FIG. 7) for transmitting notification information for notifying that the base station can be connected to a network of a plurality of providers, and the notification information transmission step. From the mobile terminal that has received the broadcast information, the mobile terminal receives information including a business operator code for identifying the business operator with which the mobile terminal is contracting, and between the business operator's network of the received business operator code and the mobile terminal A connection establishing step (see steps S106 to S108 in FIG. 7) for establishing the connection of the mobile terminal, and the location of the mobile terminal with respect to the network of the carrier established with the mobile terminal by the connection establishing step. A communication processing method including a location registration requesting step for requesting location registration for registration (see step S110 in FIG. 7) It is implemented by the base station 10.

DESCRIPTION OF SYMBOLS 10 Base station 11 Information storage part 12 Management table storage part 13 Base station wireless function part 14 Base station wired function part 15 Broadcast information generation part 16 IMSI / TMSI processing part 17 Connection destination determination part 18 Base station control part 20 Mobile terminal 21 Subscription Person information storage unit 22 Terminal wireless function unit 23 Notification information determination unit 24 Terminal control unit

Claims (5)

A notification information transmitting unit for transmitting notification information for notifying that the base station can be connected to a network of a plurality of operators;
From the mobile terminal that has received the broadcast information transmitted by the broadcast information transmitter, the mobile terminal receives information including a business code that identifies the business operator with which the mobile terminal is contracting, and the business operator of the received business code A connection establishment unit for establishing a connection between the network of the mobile terminal and the mobile terminal;
A location registration requesting unit for requesting location registration for registering the location of the mobile terminal with respect to the network of the carrier established by the connection establishing unit with the mobile terminal;
A base station characterized by comprising:   The base station according to claim 1, wherein the broadcast information transmitting unit transmits broadcast information including a common code common to all operators to a mobile terminal.   The base station according to claim 1, wherein the broadcast information transmitting unit transmits broadcast information listing business codes of connectable business operators to the mobile terminal. A corresponding code generation unit that generates a corresponding code corresponding to the received terminal identification code when receiving the terminal identification code issued from the network of the business operator requested to register the location;
When information to be relayed from the mobile terminal to the operator's network is received, the corresponding code included in the received information is converted into a corresponding terminal identification code, and the received information is converted to the operator's network. When the information to be relayed to the mobile terminal is received from the operator's network, the terminal identification code included in the received information is converted into a corresponding code, and the received information is The base station according to claim 1, further comprising an information relay unit relaying to the mobile terminal. A broadcast information transmission step of transmitting broadcast information for notifying that the base station is connectable to a plurality of carriers'networks;
From the mobile terminal that has received the broadcast information transmitted in the broadcast information transmission step, the mobile terminal receives information including a business code that identifies the business operator with which the mobile terminal is contracting, and the business operator of the received business code Establishing a connection between the network of the mobile terminal and the mobile terminal;
A location registration requesting step for requesting location registration for registering the location of the mobile terminal with respect to the network of the carrier established with the mobile terminal by the connection establishing step;
The communication processing method characterized by including.

Images