JP2011188128A - Mobile communication system, base station, mobile management device, subscriber information management device and mobile extension connection method - Google Patents

Abstract

A mobile communication system capable of providing an extension connection service to a mobile device at a reduced cost.
An HSS 25 holds, for each mobile device, extension contract information indicating a private network with an extension contract, and extension connection area information indicating whether the mobile terminal is located in an area with an extension contract. Then, the MME notifies the femto base station 3-1 that the extension contract mobile station is connected based on the extension contract information and extension connection area information acquired from the HSS 25, and the femto base station 3-1 The extension SIP server 4 is notified that the extension contract mobile station is within its own area, and when there is a call request from the mobile station 1-1, the mobile terminal is connected to the destination mobile station via the public mobile communication system. A public communication path is set, and after setting an extension communication path in an extension network with a mobile device, the public communication path is switched to the extension communication path.
[Selection] Figure 3

Description

  The present invention relates to a mobile communication system, a base station, a mobility management device, a subscriber information management device, and a mobile device extension connection method for connecting a mobile device to an extension system.

  A technique for providing an extension service to a mobile device in a public mobile communication system is described in Patent Document 1 below. In this system, a wireless protocol used in an indoor system that provides an extension service and a wireless protocol used in a public mobile communication system are common. The indoor system includes some devices equipped with functions of public mobile communication systems, such as wireless base stations, PDSN / PCF (Packet Data Serving Node / Packet Control Function), in-CSCF (in-Call Serving Control Function), etc. Duplicate placement. As a result, the mobile device can communicate both in the indoor system and in the public mobile communication system.

  On the other hand, in recent years, public mobile communication systems have started a service for providing a small call area by connecting a small base station called a femto base station to an Internet line installed on a site such as a home. This femto base station is connected to a public mobile communication system via an Internet line, and an end user of a mobile device can open a call area.

  In 3GPP (3rd Generation Partnership Project), which is a standard organization for third-generation mobile phones, femto base stations are referred to as Home NodeB or Home eNodeB to standardize femto base stations (for example, Non-Patent Document 1 below). reference). In the standardization work of 3GPP, the public mobile communication system provides a public communication connection service to a mobile device using the fact that the femto base station is connected to the Internet line, and is different from the public communication connection service. Studies on Local IP access for realizing a connection service (for example, Internet service) are also being conducted.

JP 2008-228250 A

3GPP, “3GPP TS 22.20 V9.0.0”, 2009-03

  However, according to the technique described in Patent Document 1, in order to provide an extension connection service in a public mobile communication system, a private network (indoor system) that implements the connection service has a function equivalent to that of the public mobile communication system. It is necessary to arrange a device having the above. Therefore, there has been a problem that the cost becomes high.

  Also, in Non-Patent Document 1, a Local IP (Internet Protocol) Access at a femto base station has been studied, and a study to provide a connection service different from a service provided by a public mobile communication system has been performed. ing. However, provision of extension connection services such as those provided by private networks is not stipulated.

  The present invention has been made in view of the above, and can provide a mobile communication system, a base station, a mobility management device, and a subscriber information management device capable of providing an extension connection service to a mobile device at a reduced cost. And it aims at obtaining the extension line connection method of a mobile station.

  In order to solve the above-described problems and achieve the object, the present invention provides an extension network including a call control server for performing an extension call, a mobility management device for managing mobility of a mobile device, and a subscriber of the mobile device A mobile communication system including a subscriber information management device for managing information, wherein the extension network includes a base station connected to the public mobile communication system, and the subscriber information The management device includes extension contract information including information on whether or not an extension contract is made for each mobile device, and information for identifying the extension network of a contract target of the mobile device having the extension contract, and the movement An extension connection area that includes information on whether or not the communication area in which the mobile station is located is the communication area of the base station belonging to the extension network to which the mobile station has an extension contract. The mobility management device receives the extension contract information and the extension connection area information of the mobile device from the subscriber information management device when the mobile device is activated or registered. If it is determined that, based on the extension contract information and the extension connection area information, the mobile station is located in the communication area of the base station with the extension contract, the mobile station Is notified to the base station where the base station is located as an extension mobile station location notification that the extension contract mobile station, which is a mobile station that has an extension contract with the extension network to which the base station belongs, is connected, When the base station receives the extension mobile station location notification, the base station notifies the call control server that the extension contract mobile station is in its own communication area, and the extension that is in its own communication area. From contract mobile, other The originating base station, which is the base station that has received the call request for the extension call to the extension contract mobile station, communicates with the public mobile communication system with the extension contract mobile station that is the destination. A public communication path that is a communication path through the system is set, and then an extension communication path that is a communication path with the extension contract mobile station as a destination in the extension network is set in the call control server. The call control server transmits the requested extension channel request, sets the extension channel based on the extension channel request, and connects with the originating base station and the extension contract mobile device of the destination The terminating base station, which is the base station, switches the public communication path to the extension communication path.

  According to the present invention, extension contract information indicating whether or not the subscriber information management apparatus has an extension contract for each mobile device, and extension connection area information indicating whether or not the mobile device is in the extension connection area. The mobile management device acquires subscriber information and location information from the subscriber information management device at the time of registration or location registration at the time of activation of the mobile station, and based on the subscriber information, The station is notified that the extension contract mobile station is connected, and the base station notifies the call control server that the mobile station is under its control. Further, the subscriber information management device notifies the extension AS of the subscriber information and the location information including the extension connection area information. Then, when there is an extension call from the mobile device, the base station sets a communication path via the public mobile communication system with the destination mobile device for the public mobile communication system, and then performs call control. The server is requested to set up a VoIP communication path with a mobile device in the extension network. Since the caller and receiver base stations switch the communication channel to the VoIP channel in the private network, the extension connection service can be provided to the mobile device at a reduced cost. , Has the effect.

FIG. 1 is a diagram illustrating a configuration example of a mobile communication system. FIG. 2 is a diagram illustrating a connection example of devices in a private network. FIG. 3 is a chart showing an example of the operation when the mobile device is activated in the service area of the femto base station. FIG. 4 is a diagram showing a configuration example of the subscriber information database. FIG. 5 is a diagram illustrating a configuration example of the position information database. FIG. 6 is a diagram showing a configuration example of a location correspondence information database showing an example of correspondence between extension connection area identifiers and location information. FIG. 7 is a chart showing an example of a location registration procedure when the mobile device has moved under the control of the femto base station. FIG. 8 is a chart showing an example of an operation for performing an extension connection when the calling-side mobile device and the called-side mobile device are located in an area where extension connection is possible. FIG. 9 is a chart showing an example of the disconnection operation after a call is made between the mobile device and the mobile device using the extension connection service.

  Embodiments of a mobile communication system, a base station, a mobility management device, a subscriber information management device, and a mobile station extension connection method according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment.
FIG. 1 is a diagram showing a configuration example of a mobile communication system according to the present invention. As shown in FIG. 1, the mobile communication system of the present embodiment includes a private network (extension network) 10 installed in a private area such as indoors, and a public mobile communication system 40.

  The private network 10 includes fixed extension telephones 2-1 and 2-2, femto base stations 3-1 and 3-2, an extension SIP (Session Initiation Protocol) server 4 which is a call control server, and an extension MGW (Media Gateway). 5). The number of fixed extension telephones and femto base stations may be any number. The extension SIP server 4 performs call control for terminals (for example, fixed extension telephones 2-1 and 2-2) in a private network by SIP. The extension MGW 5 is a device that provides a voice call service based on VoIP (Voice over IP) to terminals in a private network. Instead of the extension SIP server and the extension MGW, an IP PBX may be provided. With the above configuration, the private network 10 provides an extension call service to terminals (for example, fixed extension telephones 2-1 and 2-2) in the private network 10.

  The public mobile communication system 40 is a public mobile communication system compliant with LTE (Long Term Evolution) defined by 3GPP. The public mobile communication system 40 includes an EPC (Evolved Packet Core) 21, an IMS (IP Multimedia Subsystem) 31, and a public base station 26 connected to the EPC.

  The EPC 21 is a core network defined by 3GPP, and is a core network that integrally accommodates various access networks such as 3G and a wireless LAN (Local Area Network). The EPC 21 includes a mobility management entity (MME) 22 that performs location management, mobility management, wireless connection management, and the like of mobile devices (for example, the mobile devices 1-1 and 1-2), a Serving GW 23, and a PDN. A GW 24 and an HSS (Home Subscriber Server) 25, which is a subscriber information management device that stores and manages location information and subscriber information of a mobile device in cooperation with the MME.

  Serving GW 23 and PDN GW 24 cooperate with MME 22 to provide a connection service between IMS 31 of public mobile communication system 40 to mobile devices via femto base stations 3-1, 3-2 or public base station 26. provide. Note that the EPC 21 of the present embodiment is defined by the 3GPP standard, and has a configuration according to the example. Further, the EPC 21 of the public mobile communication system 40 is connected to the Internet 11.

  The IMS 31 is a system or device for providing a multimedia service or the like defined by 3GPP. IMS 31 activates an extension connection service in cooperation with CSCF (Call Session Control Function) 32 that performs call control with a mobile station and CSCF (corresponding to S-CSCF in the 3GPP standard) 32 by SIP. An extension AS (Application Server) 33 for identifying whether or not, and an MGW 34 for providing a voice call service based on VoIP to the mobile device. Note that the CSCF 32, the extension AS (Application Server) 33, and the MGW 34 may be configured as one device (IMS31), or may each be a single device.

  In the 3GPP standard, the CSCF is divided into three parts: P-CSCF (Proxy-CSCF), S-CSCF (Serving-CSCF), and I-CSCF (Interrogating-CSCF). In the implementation of the main operation of the embodiment, since these functional divisions are not directly related, three parts indicated by the 3GPP standard are shown as one device as CSCF32. The configuration example of FIG. 1 shows an example of a device related to the operation of providing an extension connection service to the mobile devices 1-1 and 1-2, and the actual configuration is other than the devices described above. An apparatus may be provided.

  The femto base stations 3-1 and 3-2 connect to the EPC 21 via the Internet 11 using the Internet lines 12-1 and 12-2, respectively. Further, the femto base stations 3-1 and 3-2 are connected to the extension SIP server 4 and the extension MGW 5 in the private network 10.

  The mobile devices 1-1 and 1-2 are mobile devices that have contracts (extension contracts) for connecting to the extension call service provided by the private network 10. In the example shown in FIG. 1, it is assumed that the mobile device 1-1 is wirelessly connected to the femto base station 3-1, and the mobile device 1-2 is wirelessly connected to the femto base station 3-2. Further, when the mobile devices 1-1 and 1-2 are located within the service area of the public base station 26 of the public mobile communication system 40, the mobile devices 1-1 and 1-2 are wirelessly connected to the public base station 26.

  In FIG. 1, the VoIP flow (speech path) is indicated by a solid line, the radio control flow and the HeNB (Home NodeB) control flow are indicated by thick fine dotted lines, the SIP control flow is indicated by a thick wide dotted line, and the other control flows are indicated by thin dotted lines. However, each flow is an example, and each control may be performed by a flow other than the control flow shown in FIG.

  FIG. 2 is a diagram illustrating a connection example of devices in the private network 10. As shown in FIG. 2, the extension SIP server 4, fixed extension telephones 2-1 and 2-2, extension MGW 5, and femto base stations 3-1 and 3-2 are connected to a LAN line 6. The LAN line 6 is connected to a router 7, and a private network 10 is connected to the Internet 11 via the router 7. Further, a femto base station GW apparatus 27 is installed between the EPC 21 and the Internet 11.

  The femto base stations 3-1 and 3-2 are connected to the EPC 21 via the LAN line 6, the router 7, the Internet 11, and the femto base station GW device 27, and each device in the EPC 21 is similar to the public base station 26. The base station to be managed (under the control of EPC21).

  Here, the base stations installed in the private network 10 are the femto base stations 3-1 and 3-2, but base stations other than the femto base stations may be installed in the private network 10. Here, the base stations installed in the private network 10 (in this example, the femto base stations 3-1 and 3-2) are connected to the EPC 21 via the Internet 11. The EPC 21 may be connected by other methods.

  In the present embodiment, a method for providing an extension call service to the mobile devices 1-1 and 1-2 will be described. However, the extension SIP server 4, the extension MGW 5, which are devices in the private network 10 shown in FIG. The extension fixed telephones 2-1 and 2-2 and the router 7 are extension calls between terminals (extension fixed telephones or the like) in the private network 10 (for example, an extension between the extension fixed telephone 2-1 and the extension fixed telephone 1-2). It is possible to use an existing device installed for a call or the like (not including an extension call with the mobile devices 1-1 and 1-2). In other words, devices other than the femto base stations 3-1 and 3-2 can use existing devices installed for extension calls between terminals in the private network 10.

  The communication between the femto base stations 3-1 and 3-2 and the EPC 21 passes through the router 7 and the femto base station GW device 27. In the following description, the router 7 and the femto base station GW device 27 are connected. The description of going through is omitted.

  Next, the operation of the present embodiment will be described. FIG. 3 is a chart showing an example of the operation when the mobile device 1-1 is activated in the service area (communication range) of the femto base station 3-1. First, the mobile device 1-1 is activated when the operator turns on the power (step S11). When activated, the mobile device 1-1 performs an initial attach process on the MME 22 in the EPC 21 via the femto base station 3-1 (step S12). The Initial Attach process is a process defined by the 3GPP standard, and is an initial process (such as location registration) at the time of activation. Through the Initial Attach process, the MME 22 recognizes the area where the mobile device 1-1 is located by recognizing the base station (in this case, the femto base station 3-1) to which the mobile device 1-1 is connected.

  The MME 22 of the EPC 21 requests the HSS 25 to update the location information of the mobile device 1-1 using the location of the mobile device 1-1 recognized by the initial attach process (the area where the mobile device 1-1 is located). At the same time, the subscriber information of the mobile device 1-1 is acquired from the HSS 25 (step S13). It is assumed that the HSS 25 holds and manages location information and subscriber information of mobile devices to be managed (including mobile devices 1-1 and 1-2). The HSS 25 holds the area where the mobile device is located for each mobile device as position information. In this embodiment, the HSS 25 further holds extension connection area information described later for each mobile device. It is assumed that the extension connection area information is also updated at the same time. In the present embodiment, as described later, it is assumed that the subscriber information includes extension contract information indicating information such as whether or not an extension contract is made.

  Next, the mobile device 1-1 performs line setting with the CSCF 32 in the IMS 31 of the public mobile communication system 40 via the femto base station 3-1 and the EPC 21 (step S14). Thereafter, the mobile device 1-1 performs a registration process (registration process) on the CSCF 32 (step S15). In the 3GPP standard, the CSCF 32 that performs the registration process is the home of the mobile device 1-1, that is, the S-CSCF to which the mobile device 1-1 belongs. It is assumed that the S-CSCF to which the mobile device 1-1 belongs is determined in advance.

  Next, the CSCF 32 requests acquisition of the location information and subscriber information of the mobile device 1-1 from the HSS 25, and the HSS 25 updates the extension connection location information of the mobile device 1-1 to the CSCF 32 based on the request. The subscriber information is notified to the CSCF 32 (step S16). The position information will be described later. Further, the HSS 25 notifies the extension AS 33 of extension connection area information, position information, and subscriber information of the mobile device 1-1 (step S17).

  Based on the subscriber information and location information acquired in step S12, the MME 22 of the EPC 21 is located in an area where the mobile device 1-1 is an extension contract mobile device (extension mobile device) and an extension connection service is available. (Step S18). The MME 22 can communicate with the femto base station 3-1 when the mobile device 1-1 (extension contract mobile device) has an extension contract with the femto base station 3-1 where the mobile device 1-1 is located. The fact that the user is in the service area (area) is notified (step S19).

  As a result, the femto base station 3-1 recognizes that the mobile device 1-1 subordinate to the extension is in the service area, and the mobile device 1-1 subordinate to the extension is in the service area. It is determined that it is necessary to notify and register to the extension SIP server 4 as location information (step S20). The femto base station 3-1 performs a registration process on the extension SIP server 4 in order to notify that the mobile device 1-1 with which the extension is contracted is located (step S 21). It is assumed that the extension SIP server 4 holds and manages, as the location information, whether or not each mobile device has an extension contract and in which femto base station the service area of the mobile device. By this registration processing, the extension SIP server 4 grasps that the mobile device 1-1 with the extension contract exists under the femto base station 3-1, and updates the location information based on the grasped result. (Step S22).

  By the above operation, the extension SIP server 4 can manage the location information of the mobile device 1-1 which is the extension contract mobile device, and implements an extension connection incoming call service to the mobile device 1-1. It becomes possible.

  In the present embodiment, the subscriber information held by the HSS 25 includes information on whether or not the mobile device has an extension contract and extension connection to the extension contract mobile device (mobile device having an extension contract). It is assumed that extension determination information, which is information for determining an extension call when making a call, is stored. The subscriber information generally includes information other than these, but the other information is not particularly limited and is the same as the conventional information.

  For example, the HSS 25 holds subscriber information as a subscriber information database. FIG. 4 is a diagram showing a configuration example of the subscriber information database. For example, as shown in FIG. 4, the subscriber information database is composed of mobile unit identifiers, subscriber information, extension contract information, and extension determination information. The subscriber information shown in FIG. 4 indicates information excluding extension contract information and extension determination information, that is, subscriber information similar to the conventional one.

  The extension contract information includes the presence / absence of the extension contract and the identifier of the private network that is the target of the contract when the extension contract is made. In the configuration example of FIG. 1, one private network 10 is described, but the EPC 21 may be connected to two or more private networks (networks that perform extension call services). Need to be identified. In FIG. 1, information for identifying a private network is used as an extension connection area identifier. The extension connection area identifier represents the private network to which the mobile station belongs. When there is a request for extension connection, it is determined whether or not the mobile station is in the area of the corresponding extension connection area identifier. , And a determination as to whether or not the connected mobile device has the same extension connection area identifier. Here, the extension connection area identifier of the private network 10 shown in FIG. 1 is “private # 1”.

  In the example of FIG. 4, the mobile device 1-1 and the mobile device 1-2 are extension contract mobile devices, and the extension connection area identifier indicating the area where the extension connection of these mobile devices is possible is “private # 1”. It is shown that. Further, in the example of FIG. 4, the mobile devices 1-7 (not shown in FIG. 1) are extension contract mobile devices, and the extension connection area identifier is “private # 2”. Further, the mobile device 1-N (not shown in FIG. 1) exemplifies that the mobile device does not have an extension contract.

  The extension determination information is information for determining whether to activate the extension connection service during call control of the mobile device. The extension determination information is, for example, prefix number information at the time of extension transmission. For example, if it is determined that the user of the mobile device inputs “#” when making a call using the extension connection service, the operator of the mobile device inputs “#” when making a call using the extension connection service. Enter your extension phone number later. In this case, the prefix number “#” is used to identify the extension connection service, and this prefix number is set in the connection destination information in the INVITE message that is the SIP transmission message.

  Since the prefix number may vary depending on the private network to which the mobile device belongs, it is stored and managed for each mobile device as extension determination information in the subscriber information database of the mobile device. If all the mobile devices to be managed use the same prefix number, the extension determination information may be held as a fixed value and may not be included in the subscriber information database. In the example of FIG. 4, the extension determination information of the mobile device 1-1 and the mobile device 1-2 is the prefix number “#”, and the extension determination information of the mobile device 1-7 is the prefix number “7”. Show.

  The HSS 25 also stores extension connection area information, which is information indicating whether each mobile station is located in an area where the extension connection service can be performed, in a position information database that manages position information. At the same time, the extension connection area information is also updated. FIG. 5 is a diagram illustrating a configuration example of the position information database. In the example of FIG. 5, the location information database is configured with an identifier of the mobile device, location information, and extension connection area information.

  The location information indicates an area where the mobile device is located. This area indicates a service area for each base station, and corresponds to information on which base station the service area exists. For example, “area # 3-1” indicates the service area of the femto base station 3-1, and “area # 3-2” indicates the service area of the femto base station 3-2.

  The extension connection area information is either that the mobile station is located in the extension connection area corresponding to the mobile station, is located outside the extension connection area corresponding to the mobile station, or has no information (no extension contract). It is the information which shows. In the example of FIG. 5, the mobile device 1-1 and the mobile device 1-2 are located in the extension connection area “private # 1” in which the mobile device 1-1 has an extension contract, and the mobile device 1-7 This indicates that you are located outside the extension connection area “Private # 2” for which you have an extension. Further, since the mobile device 1-N is a mobile device that does not have an extension contract, no extension connection area information is stored (no information).

  FIG. 6 is a diagram showing a configuration example of a location correspondence information database showing an example of correspondence between extension connection area identifiers and location information. In the example of FIG. 6, the position correspondence information database includes an extension connection area identifier and position information. The position correspondence information database stores a correspondence between an extension connection area identifier and position information which is an area (a service area of the femto base station) constituting the extension connection area corresponding to the identifier. In the example of FIG. 6, the extension connection area corresponding to the extension connection area identifier “private # 1” is composed of “area # 3-1” and “area # 3-2”, and corresponds to the extension connection area identifier. In this example, the extension connection area “private # 2” includes “area # 3-3”.

  When updating the location information in the location information database of each mobile device, the HSS 25 determines the extension connection area information based on the updated location information and the location correspondence information database, and updates the extension connection area information.

  Next, the operation at the time of location registration (Tracking Area Update) when the mobile device 1-1 moves under the control of the femto base station 3-1 arranged in the private network 10 with the power on. Will be described. FIG. 7 is a chart diagram illustrating an example of a location registration procedure when the mobile device 1-1 moves under the control of the femto base station 3-1.

  First, the mobile device 1-1 moves from the area under the control of the femto base station 3-1 to the control of the femto base station 3-1, with the power on, and starts the position registration process (step S31). . The mobile device 1-1 performs a location area update (Tracking Area Update) process on the MME 22 of the EPC 21 via the femto base station 3-1. This location registration process is an operation defined by the 3GPP standard. The MME 22 of the EPC 21 requests the HSS 25 to update the location information of the mobile device 1-1, and acquires the subscriber information of the mobile device 1-1 from the HSS 25 (step S33). Subsequent steps S34 to S39 are the same as steps S17 to S22 of the process at the time of activation of the mobile device 1-1 described in FIG.

  With the above processing, the extension SIP server 4 can manage the location information of the mobile device 1-1 that is the extension contract mobile device, and implements the extension connection incoming call service to the mobile device 1-1. It becomes possible.

  Next, the operation when mobile devices make an extension call will be described. FIG. 8 is a chart showing an example of an operation for performing extension connection when the calling-side mobile device 1-1 and the receiving-side mobile device 1-2 are located in an area where extension connection is possible. . The CSCFs 32-1 and 32-2 are the same as the above-described CSCF 32, and the EPCs 21-1 and 21-2 are the same as the above-described EPC21. The CSCFs 32-1 and 32-2 belong to the IMS 31, and the EPCs 21-1 and 21-2 belong to the public mobile communication system and are connected to the IMS 31. In FIG. 8, the CSCF and EPC on the calling side are CSCF32-1 and EPC21-1, respectively, and the CSCF and EPC on the receiving side are CSCF32-2 and EPC21-2, respectively. However, as shown in FIG. The same CSCF 32 and EPC 21 may be used on the receiving side and the receiving side. Assume that the originating EPC 21-1 is connected to the mobile device 1-1 via the Internet 11, and the incoming EPC 21-2 is connected to the mobile device 1-2 via the Internet 11.

  First, the user of the mobile device 1-1 on the transmission side operates the mobile device 1-1 to activate transmission by the extension connection service to the mobile device 1-2 on the reception side. At this time, a prefix number, for example, “#”, which is extension determination information, is first input, and then an extension telephone number is input to make a call. The mobile station 1-1 on the transmission side transmits a SIP transmission (INVITE) message for starting the extension connection to the femto base station 3-1 on the transmission side (step S41). The outgoing message includes the extension determination information (prefix number) described above.

  When the outgoing femto base station 3-1 receives this outgoing message, it identifies whether the outgoing call is an extension based on the extension determination information in the message, and stores that this outgoing call is an extension connection service. (Step S42). The extension determination information may be stored and stored in advance in the femto base stations 3-1 and 3-2, or when the femto base stations 3-1 and 3-2 are activated, the private network You may make it acquire from the database in 10.

  Next, the femto base station 3-1 transmits a SIP transmission message to the CSCF 32-1 on the transmission side in the IMS 31 via the EPC 21-1 on the transmission side of the public mobile communication system (step S43). In the 3GPP standard, the home of the originating mobile device 1-1, that is, the P-CSCF to which the originating mobile device 1-1 belongs receives the SIP outgoing message, and the originating mobile device 1-1 belongs to it. Although the SIP transmission message is notified to the S-CSCF by relaying to the S-CSCF, FIG. 8 shows CSCF 32-1 and 32-2 without distinguishing between the S-CSCF and the P-CSCF.

  The S-CSCF in the CSCF 32-1 on the transmission side acquires subscriber information of the mobile device during the initial attach operation or the location registration operation. The S-CSCF in the CSCF 32-1 on the calling side determines extension transmission by comparing the extension determination information in the subscriber information with the extension determination information in the notified SIP transmission message (step S44). . Next, the S-CSCF in the CSCF 32 notifies the extension AS 33 of a SIP transmission message in order to operate in cooperation with the extension AS 33 (step S45).

  The extension AS33 determines whether or not both the mobile device 1-1 as the caller and the mobile device 1-2 as the callee can be connected to each other (step S46). Specifically, the extension AS33 determines whether each of the mobile devices 1-1 and 1-2 is an extension contract mobile device based on the extension contract information of the subscriber information notified from the HSS 25, and the extension If it is a contract mobile device, it is determined whether or not they are the same extension connection area identifier, that is, whether or not they are mobile devices belonging to the same private area network. Further, when the extension AS33 determines that the mobile device 1-1 and the mobile device 1-2 are extension contracted mobile devices corresponding to the same extension connection area identifier, the extension connection area information of the mobile device notified from the HSS 25 is provided. Based on the above, it is determined whether each mobile station is in the extension connection area of the private network to which it belongs (extension contract), and both mobile stations belong to (extension If it is located in the extension connection area of the private network (contracted), it is determined that the extension connection is possible.

  Next, the extension AS33 transmits a SIP call (INVITE) message for a call from the mobile device 1-1 to the mobile device 1-2 to the CSCF 32-1 on the transmission side (step S47). When receiving the SIP transmission (INVITE) message, the CSCF 32-1 on the transmission side transfers the SIP transmission (INVITE) message to the CSCF 32-2 on the reception side (step S48).

  Although not shown in FIG. 8, in the 3GPP standard, the CSCF 32-1 in this case is the home of the receiving side mobile device 1-2, that is, the I-CSCF to which the receiving side mobile device 1-2 belongs is SIP. The outgoing message is received, the HSS 25 is requested to acquire the subscriber information and location information of the receiving side mobile device 1-2, and the subscriber information and location information are obtained from the HSS 25. Then, the I-CSCF to which the called mobile device 1-2 belongs is notified to the home S-CSCF and P-CSCF of the called mobile device 1-2.

  Upon receiving this SIP call (INVITE) message, the caller CSCF 32-1 sets the VoIP call path setting to the caller EPC 21 in order to set the call path for VoIP communication to the caller mobile device 1-1. -1 is requested (step S49). The calling-side EPC 21-1 performs VoIP communication path setting processing for the mobile device 1-1 in cooperation with the calling-side femto base station 3-1 (step S 50). Note that the VoIP communication path setting method is the same as the conventional method.

  Further, the CSCF 32-2 transfers the received SIP transmission (INVITE) message to the femto base station 3-2 via the EPC 21-2 (step S51). When the femto base station 3-2 receives the SIP transmission (INVITE) message, the femto base station 3-2 determines whether or not the extension transmission is based on the extension determination information in the message and the extension determination information in the stored subscriber information. And the fact that this call is an extension connection service is stored (step S52). Further, the femto base station 3-2 transfers the received SIP transmission (INVITE) message to the mobile device 1-2 (step S53).

  The CSCF 32-2 requests the incoming EPC 21-2 to set the VoIP speech path in order to set the speech path for the incoming VoIP communication to the mobile terminal 1-2 on the incoming side (step S54). . The terminating EPC 21-2 performs VoIP communication path setting processing for the terminating mobile device 1-2 in cooperation with the terminating femto base station 3-2 (step S55).

  Upon receiving the SIP call (INVITE) message, the callee mobile device 1-2 sends a SIP call response message (200 OK) as a response to the caller side femto base station 3-2. (Step S56). In the present embodiment, an example is shown in which communication is performed with a SIP call response message in response to a SIP call message, but communication may be performed after a SIP option message is transmitted and received.

  When the incoming femto base station 3-2 receives the SIP call response message, it determines that the call is in communication via the public mobile communication system 40, and stores the determination result (step S57).

  Next, the incoming femto base station 3-2 transfers the received SIP call response message to the incoming CSCF 32-2 (step S58). The incoming CSCF 32-2 transfers the received SIP call response message to the outgoing CSCF 32-1 (step S59).

  The CSCF 32-1 on the transmission side transmits the received SIP call response message to the femto base station 3-1 via the EPC 21-1 on the transmission side (step S60). When the femto base station 3-1 receives this SIP call response message, the femto base station 3-1 determines that the call is in a communication state via the public mobile communication system 40, and stores the determination result (step S61).

  Next, the calling-side femto base station 3-1 transfers the received SIP calling response message to the calling-side mobile device 1-1 (step S62). As a result, the mobile device 1-1 on the transmission side and the mobile device 1-2 on the reception side are communicating with each other via the public mobile communication system 40, and a VoIP communication path is opened via the public mobile communication system 40 (step S63). .

  Next, the femto base station 3-1 on the transmission side stores in step S42 that the call is an extension call, and that the call is in communication via the public mobile communication system 40 in step S61. Judging. The originating femto base station 3-1 transmits the mobile station 1 to the mobile station 1 with respect to the extension SIP server 4 when the call is an extension call and is being communicated via the public mobile communication system. A SIP call (INVITE) message for making a call to -2 is transmitted (step S64).

  Upon receiving this SIP call (INVITE) message, the extension SIP server 4 searches for the femto base station 3-2 in which the mobile device 1-2 on the receiving side is located (step S65), and the femto obtained by the search A SIP transmission message is transmitted to the base station 3-2 (step S66). The extension SIP server 4 has acquired the location information of the mobile device in the above-described step S22 or step S39.

  The femto base station 1-2 transmits a SIP call response message, which is a response to the received SIP call message, to the extension SIP server 4 (step S67). The extension SIP server 4 requests the extension MGW 5 to open a VoIP communication path in the private network 10 between the calling-side femto base station 3-1 and the receiving-side femto base station 3-2 ( Step S68). The extension MGW 5 opens a VoIP communication path between the femto base station 3-1 and the femto base station 3-2 based on the request.

  Further, the extension SIP server 4 transfers the received SIP call response message to the femto base station 3-1 on the caller side (step S69). The femto base station 3-1 connects the femto base station 3-1 in the private network 10 and the incoming femto base station 3-2 from the VoIP communication path via the public mobile communication system 40. (Step S70). In addition, the femto base station 3-2 also connects the femto base station 3-1 in the private network 10 to the femto base station 3 in the private network 10 from the VoIP communication path via the public mobile communication system 40. 2 is switched to the VoIP call path between the two (step S71).

  Thereby, the VoIP communication path between the mobile device 1-1 and the mobile device 1-2 in the private network 10 is established (step S72). Through the above processing, between the mobile device 1-1 and the mobile device 1-2, a call using an extension using the VoIP communication path between the mobile device 1-1 and the mobile device 1-2 in the private network 10 ( Extension connection service) can be started. Thereafter, the calling-side femto base station 3-1 requests the MME 22 of the calling-side EPC 21-1 to release the VoIP communication path other than the wireless section, and also cooperates with the Serving GW 23 of the EPC 21-1 VoIP call path release processing is performed (step S73). Further, the femto base station 3-2 requests the MME 22 of the terminating EPC 21-2 to release the VoIP communication path other than the radio section, and cooperates with the Serving GW 23 of the EPC 21-2 to establish the VoIP communication path other than the radio section. Release processing is performed (step S74).

  As a result, the VoIP call other than the radio section via the public mobile communication system 40 for the communication, that is, the femto base station 3-1 on the transmission side, the MGW 34 of the IMS 31 of the public mobile communication system 40, and the femto base station 3 on the reception side. -2 is released (step S75).

  As described above, the base stations 3-1 and 3-2 extend the extension from the EPC 21 to indicate that the extension contract mobile station that has an extension contract with the private network 10 to which the base station belongs is located in its own communication area. Upon receiving the in-service area notification, the in-zone information notifying means for notifying the extension SIP server 4 that the extension contract mobile station is in its own communication area, and the extension contract existing in its own communication area When a call request for an extension call to another extension contract mobile station is received from the mobile station, the EPC 21 sets a communication path via the public mobile communication system 40 with the destination extension contract mobile station. A request is made to set a communication path in the private network 10 between the public mobile communication path setting means to be requested and the extension contracted mobile station of the incoming call destination after setting the communication path via the public mobile communication system 40. After setting the communication path click 10, the thus provided with extension communication path setting means for switching a communication path via the public mobile communication system 40 to the communication path of the private network 10.

  Also, the MME 22 is based on the extension information acquisition means for acquiring extension contract information and extension connection area information from the HSS 25, the extension contract information, and the extension connection area information when the mobile device is activated or registered. If it is determined that the mobile station is within the communication area of the femto base station with the extension contract, the extension mobile station location notification is sent to the femto base station where the mobile station is located. In-zone notification means for notifying

  The HSS 25 also includes an extension connection area information storage means for storing a location information database including extension connection area information as described above, and an extension for storing a subscriber information database including extension contract information as described above. The contract information storage means and the information notifying means for transmitting the extension connection area information and extension contract information corresponding to the mobile device when the location information of the mobile device is acquired from the MME 22 are provided.

  FIG. 9 is a chart showing an example of the disconnection operation after the mobile device 1-1 and the mobile device 1-2 make a call by the extension connection service. It is assumed that a VoIP communication path for extension connection service is established between the mobile device 1-1 and the mobile device 1-2 by the procedure described with reference to FIG. In this case, a disconnection operation for terminating the extension call will be described.

  First, a VoIP communication path via the private network 10 is established (step S81). When the user of the mobile device 1-1 on the transmission side performs a disconnect operation on a call during an extension call, the mobile device 1-1 transmits a SIP disconnect message (BYE) (step S82).

  When the calling femto base station 3-1 receives the SIP disconnect message (BYE) from the mobile device 1-1, it determines that the call in the extension connection service has been disconnected (step S83). When making this determination, for example, a call is identified using a SIP Call-ID (call identifier), and it is determined whether the call corresponding to the call is an extension call.

  Next, the femto base station 3-1 transfers the SIP disconnect message to the CSCF 32-1 on the caller side via the EPC 21-1 on the caller side (step S84). In this case, in the 3GPP standard, the home of the originating mobile device 1-1, that is, the P-CSCF to which the originating mobile device 1-1 belongs receives the SIP disconnect message, and the originating mobile device 1-1 By relaying to the S-CSCF to which it belongs, a SIP disconnect message is notified to the S-CSCF.

  The originating CSCF 32-1 transfers the SIP disconnect message to the terminating CSCF 32-2 (step S85). In addition, the CSCF 32-1 on the calling side notifies the EPC 21-1 on the calling side of a request for releasing the VoIP communication path (step S86). The EPC 21-1 cooperates with the femto base station 3-1, and performs a VoIP communication path release process for the communication (step S87). Since the call is in the extension connection service, the VoIP communication path via the public mobile communication system has already been released.

  The calling-side EPC 21-1 determines that the call path is a call in the extension connection service based on the line identifier set in the notified VoIP call path release request, and wireless communication is performed on the communication path. The VoIP line in the section is released (step S88).

  Having received the SIP disconnect message in S85, the terminating CSCF 32-2 transfers the SIP disconnect message to the terminating femto base station 3-2 via the terminating EPC 21-2 (step S89). The femto base station 3-2 determines that the extension call has entered the disconnection process by receiving the SIP disconnect message (step S90), and transfers the SIP disconnect message to the mobile device 1-2 (step S91).

  The CSCF 32-2 on the receiving side notifies the EPC 21-2 on the receiving side of a request for releasing the VoIP communication path for the communication (step S92). The EPC 21-2 performs a release process for the VoIP communication path in cooperation with the incoming femto base station 3-2 (step S93). Since the call is in the extension connection service, the VoIP communication path via the public mobile communication system has already been released.

  The called EPC 21-2 determines that the call path is a call in the extension connection service based on the line identifier set in the notified VoIP call path release request, and determines the radio section of the communication. The VoIP line is released (step S94).

  In addition, the receiving side mobile device 1-2 transmits a SIP disconnection response message (200 OK) as a response to the received SIP disconnection message to the receiving side femto base station 3-2 (step S95). The femto base station 3-2 transfers the SIP disconnection response message to the receiving-side CSCF 32-2 via the receiving-side EPC 21-2 (step S96).

  The incoming CSCF 32-2 transfers the received SIP disconnect response message to the outgoing CSCF 32-1 (step S97). The calling-side CSCF 32-1 transfers the received SIP disconnection response message to the calling-side femto base station 3-1 (step S98). The femto base station 3-1 receives the SIP disconnection response message, determines that the extension call has been disconnected, and releases the VoIP communication path established via the private network 10. It is determined that the SIP disconnect message is transmitted to the server 4 (step S99). The femto base station 3-1 transfers the received SIP disconnection response message to the mobile device 1-1 on the outgoing side (step S 100), and the VoIP established via the private network 10 to the extension SIP server 4. A SIP disconnect message is transmitted to release the speech path (step S101).

  The extension SIP server 4 transfers the SIP disconnect message to the incoming femto base station 32-2 (step S102). The femto base station 3-2 transmits a SIP disconnection response message to the extension SIP server 4 as a response to the received SIP disconnection message (step S103). Upon receiving the SIP disconnection response message from the femto base station 3-2, the extension SIP server 4 determines that the extension call disconnection in the private network 10 has been completed, and sends the extension femto base station 3 to the S extension MGW5. 1 and a request to release the VoIP communication path established between the receiving side femto base station 3-2 (step S104, step S105).

  Then, the extension SIP server 4 transmits the received SIP disconnection response message to the femto base station 3-1 on the transmission side (step S106). As a result, the VoIP communication path established via the private network is released (step S107), and the extension call disconnecting operation during the extension connection service is completed.

  In this embodiment, an example of performing call control based on SIP has been described. However, the call control procedure is not limited to this, and any procedure may be used, and the above-described SIP procedure is changed to a procedure based on the call control. The same operation may be performed after changing.

  In the present embodiment, the public mobile communication system 40 has been described as a system compliant with LTE specified by 3GPP. However, the present embodiment is not limited to this, and the public mobile communication system 40 is not limited to this type. You may apply. In that case, if the extension AS 30 is provided in the public mobile communication system, and the management device that manages the location information and subscriber information of the mobile device in the public mobile communication system performs the same operation as the HSS 25. Good.

  As described above, in the present embodiment, the subscriber information database including information on whether or not the HSS 25 has an extension contract for each mobile device, and the extension for which the mobile device has an extension contract for each mobile device. A location information database including extension connection area information indicating whether or not the user is in the connection area is provided. The MME 22 acquires subscriber information and location information of the mobile device from the HSS 25 at the time of registration or location registration when the mobile device is activated. Further, the HSS 25 notifies the extension AS33 of subscriber information of the mobile device and position information including extension connection area information. Based on the subscriber information, the MME 22 notifies the femto base station 3-1 that the extension contract mobile unit is connected, and the femto base station 3-1 then sends the mobile unit 1-1 to the extension SIP server 4. Notify that you are in your communication area.

  Then, when there is an outgoing call from the mobile device 1-1, the femto base station 3-1 transmits a SIP outgoing message to the public mobile communication system 40, and the destination mobile device 1-2. After setting the VoIP communication path via the public mobile communication system 40 between the two, the SIP outgoing message is transmitted to the extension SIP server 4 to set the VoIP communication path with the mobile device 1-2 in the private network 10. I requested it. The femto base station 3-1 and the incoming femto base station 3-2 are configured to switch the communication channel to the VoIP communication channel in the private network 10. Therefore, the existing private network 10 does not require any special equipment other than the femto base stations 3-1 and 3-2, and provides extension connection services to the mobile devices 1-1 and 1-2 at a reduced cost. can do.

  As described above, the mobile communication system, the base station, the mobility management device, the subscriber information management device, and the mobile station extension connection method according to the present invention are useful for a mobile communication system that connects a mobile station to an extension system. It is suitable for a mobile communication system having an existing private network that provides an extension call service to a fixed extension telephone.

1-1, 1-2 Mobile device 2-1, 2-2 Fixed extension telephone 3-1, 3-2 Femto base station 4 Extension SIP server 5 Extension MGW
6 LAN line 7 Router 10 Private network 11 Internet 12-1, 12-2 Internet line 21, 21-1, 21-2 EPC
22 MME
23 Serving GW
24 PDN GW
25 HSS
26 Public Base Station 27 Femto Base Station GW Device 31 IMS
32 CSCF
33 Extension AS
34 MGW
40 Public mobile communication systems

Claims (10)

A public mobile communication system comprising an extension network including a call control server for performing an extension call, a mobility management device for managing mobility of a mobile device, and a subscriber information management device for managing subscriber information of the mobile device; A mobile communication system comprising:
The extension network is
A base station connected to the public mobile communication system,
With
The subscriber information management device includes extension contract information including information on whether or not an extension contract has been made for each mobile station and information for identifying the extension network to be contracted by the mobile station having the extension contract. And extension connection area information including information on whether or not the communication area where the mobile station is located is a communication area of the base station belonging to the extension network with which the mobile station has an extension contract; Hold
The mobility management device acquires the extension contract information and the extension connection area information of the mobile device from the subscriber information management device when the mobile device is activated or registered, and the extension contract information and Based on the extension connection area information, if it is determined that the mobile station is located in the communication area of the base station with an extension contract, the base in which the mobile station is located To the station as an extension mobile station location notification that the extension contract mobile station that is the mobile station with the extension contract is connected to the extension network to which the base station belongs,
When the base station receives the extension mobile station location notification, the base station notifies the call control server that the extension contract mobile station is in its communication area,
The originating base station, which is the base station that has received a call request for an extension call from the extension contract mobile station located in its own communication area to another extension contract mobile station, is connected to the public mobile communication system. And setting a public communication path that is a communication path via the public mobile communication system with the extension contracted mobile station of the destination, and then, the extension contract of the destination within the extension network is set in the call control server. Send an extension channel request requesting to set an extension channel that is a communication path with the mobile device,
The call control server sets the extension communication path based on the extension communication path request,
The callee base station that is the base station connected to the caller base station and the extension contract mobile of the callee, switches the public communication path to the extension communication path,
A mobile communication system. The caller base station and the callee base station request the release of the public communication path after switching the public communication path to the extension communication path,
The mobile communication system according to claim 1. The calling base station releases a line in a wireless section with the calling extension mobile station corresponding to the extension communication path when a call disconnection request corresponding to the extension communication path is made. In addition, a notification that the call corresponding to the extension communication path has entered the disconnection process is sent to the receiving base station via the public mobile communication system as a disconnection process notification, and the extension is sent to the call control server. Request release of the contract communication path,
The receiving-side base station, based on the disconnection processing notification, releases a line in a wireless section with the extension-side contract mobile station corresponding to the extension communication path,
The mobile communication system according to claim 1 or 2, characterized in that The mobility management device transmits location information indicating that the mobile device is present in its own communication area to the subscriber information management device when the mobile device is activated or registered.
The subscriber information management device maintains a correspondence between the extension network and a communication area of the base station belonging to the extension network, and receives the location information, the correspondence, and the extension contract received from the mobility management device. Determining the extension connection area information based on the information;
The mobile communication system according to claim 1, 2 or 3. The base station is a femto base station,
The mobile communication system according to any one of claims 1 to 4, wherein: The base station is connected to the public mobile communication system via the Internet.
The mobile communication system according to any one of claims 1 to 5. A public mobile communication system comprising an extension network including a call control server for performing an extension call, a mobility management device for managing mobility of a mobile device, and a subscriber information management device for managing subscriber information of the mobile device; A base station belonging to the extension network in a mobile communication system comprising:
An extension mobile device that indicates that an extension contract mobile device that has an extension contract with the extension network to which the mobile device belongs is located in its own communication area when the mobile device is activated or registered. Upon receiving a location notification, location information notification means for notifying the call control server that the extension contract mobile device is in its communication area;
When an extension call request to another extension contract mobile station is received from the extension contract mobile station located in its own communication area, the extension contract transfer destination of the public mobile communication system is received. A public communication path setting means for setting a public communication path that is a communication path via the public mobile communication system with a machine;
After setting the public communication path, the call control server is requested to set an extension communication path that is a communication path with the extension contract mobile station as a destination in the extension network, and the extension communication path After setting, extension communication path setting means for switching the public communication path to the extension communication path,
A base station comprising: A public mobile communication system comprising an extension network including a call control server for performing an extension call, a mobility management device for managing mobility of a mobile device, and a subscriber information management device for managing subscriber information of the mobile device; The mobility management device in a mobile communication system comprising:
The extension network is
Base station according to claim 7,
With
When starting up or registering the location of the mobile device, the subscriber information management device provides information on whether or not an extension contract has been made for each mobile device and the extension subject to the contract of the mobile device having the extension contract. Whether the communication area in which the mobile station is located is the communication area of the base station belonging to the extension network in which the mobile station has an extension contract. Extension information acquisition means for acquiring extension connection area information including information on whether or not,
If it is determined based on the extension contract information and the extension connection area information that the mobile station is in the communication area of the base station that has an extension contract, the mobile station A location notification means for notifying that the extension contract mobile device, which is a mobile device having an extension contract, with the extension network to which the base station belongs is connected to the base station as the extension mobile location notification ,
A mobility management device comprising: A public mobile communication system comprising an extension network including a call control server for performing an extension call, a mobility management device for managing mobility of a mobile device, and a subscriber information management device for managing subscriber information of the mobile device; The subscriber information management device in a mobile communication system comprising:
Extension contract information for storing extension contract information including information on whether or not each mobile unit has an extension contract and information for identifying the extension network of the contract target of the mobile unit having the extension contract Storage means;
Extension contract information storage means for storing extension connection area information including information on whether or not the mobile station is a communication area of the base station belonging to the extension network with which the extension contract is made;
Information notifying means for notifying the mobility management device of extension connection area information and extension contract information corresponding to the mobile device when the location information of the mobile device is acquired from the mobility management device;
With
The extension network is
Base station according to claim 7,
With
The mobility management device requests the subscriber information management device to acquire the extension contract information and the extension connection area information of the mobile device when the mobile device is activated or registered, and the extension contract If it is determined that the mobile station is located in the communication area of the base station with the extension contract based on the information and the extension connection area information, the mobile station is located Notifying as an extension mobile station presence notification that an extension contract mobile device that is a mobile device that has an extension contract with the extension network to which the base station belongs is connected to the base station,
A subscriber information management device. A public mobile communication system comprising an extension network including a call control server for performing an extension call, a mobility management device for managing mobility of a mobile device, and a subscriber information management device for managing subscriber information of the mobile device; A mobile extension connection method in a mobile communication system comprising:
The extension network is
A base station connected to the public mobile communication system,
With
Extension contract information including information indicating whether or not the subscriber information management device has an extension contract for each mobile station and information for identifying the extension network to be contracted by the mobile station having an extension contract And extension connection area information including information on whether or not the communication area where the mobile station is located is a communication area of the base station belonging to the extension network with which the mobile station has an extension contract; And an information holding step for holding
An information acquisition step in which the mobility management device acquires the extension contract information and the extension connection area information of the mobile device from the subscriber information management device when the mobile device is activated or registered.
When the mobility management device determines that the mobile device is located in the communication area of the base station with the extension contract based on the extension contract information and the extension connection area information, As an extension mobile station location notification that the mobile station that has an extension contract with the extension network to which the base station belongs is connected to the base station in which the mobile station is located. A notification step of being notified,
When the base station receives the extension mobile station location notification, a base local area notification step for notifying the call control server that the extension contract mobile station is in its communication area;
An originating base station that is the base station that has received a call request for an extension call from the extension contract mobile station located in its own communication area to another extension contract mobile station is connected to the public mobile communication system. And setting a public communication path that is a communication path via the public mobile communication system with the extension contracted mobile station of the destination, and then, the extension contract of the destination within the extension network is set in the call control server. An extension communication path request step for transmitting an extension communication path request for requesting to set an extension communication path that is a communication path with the mobile device;
The call control server sets the extension communication path based on the extension communication path request,
The incoming base station that is the base station connected to the outgoing base station and the extension contract mobile of the incoming destination is a path switching step for switching the public communication path to the extension communication path,
A mobile extension connection method comprising:

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