JP2010233184A - Radio base station, gateway device, call connecting method and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To substitutively perform call connection processing without falling into operation disabled state. <P>SOLUTION: A failure detector 21 constituting a femto base station 20 detects failure in transmission with a core network 10. If the transmission failure is detected by the failure detector 21, in place of the core network 10, a call connector 22 performs call connection among mobile stations 30_1 to 30_m located within a range of the present station 20. Otherwise, if failure in transmission with the core network 10 is detected, in place of the core network 10, a gateway device relaying communication between the core network 10 and the femto base station 20 (and another femto base station) performs call connection among the mobile stations 30_1 to 30_m located within a range of the femto base station 20 (and of the other femto base station). <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a radio base station, a gateway device, and a call connection method and program, and more particularly to a radio base station, a gateway device, and a call connection method and program for executing call connection processing instead.

  In recent years, wireless base stations that can be installed indoors have been developed. A cell formed by this radio base station is generally called a femto cell because its cover area is extremely small compared to a radio base station installed outdoors. Therefore, in the following description, a radio base station that forms a femto cell is referred to as a femto base station. In contrast, a radio base station that forms a larger cell (generally called a macro cell) than a femto cell is referred to as a macro base station and is distinguished from a femto base station.

  The femto base station has a function equivalent to an RNC (Radio Network Controller) that controls the macro base station, and is connected to the core network directly or via a gateway device.

  Hereinafter, the configuration and operation of a mobile communication system to which a general femto base station is applied will be described with reference to FIGS.

  A mobile communication system 1x shown in FIG. 10 includes a core network 10, a femto base station 20x connected to the core network 10, and m mobile stations that perform wireless communication with the femto base station 20x and perform desired communication. 30_1 to 30_m (hereinafter may be collectively referred to as reference numeral 30).

  The operation related to the call connection process in the mobile communication system 1x will be described by taking the case where the mobile stations 30_1 and 30_2 perform communication as an example.

  As shown in FIG. 11, when the mobile station 30_1 is located in the femto base station 20x (step S101), the mobile station 30_1 wirelessly transmits a location registration request 51_1 to the femto base station 20x (step S102). The femto base station 20x transfers the location registration request 51_1 to the core network 10 (step S103). The core network 10 transmits the location information 52_1 of the mobile station 30_1 included in the location registration request 51_1 to the VLR (Visitor Location Register) (not shown) or the HLR (Home Location Register) and the identification information (ID and telephone) of the mobile station 30_1. The number is registered in association with the number (step S104).

  Similarly, when the mobile station 30_2 is located in the femto base station 20x (step S105), the mobile station 30_2 wirelessly transmits a location registration request 51_2 to the femto base station 20x (step S106). The femto base station 20x transfers the location registration request 51_2 to the core network 10 (step S107). The core network 10 registers the location information 52_2 of the mobile station 30_2 included in the location registration request 51_2 in association with the identification information of the mobile station 30_2 in the VLR or HLR (step S108).

  In the following description, the location registration request may be generically designated by reference numeral 51 and the location information may be generically designated by reference numeral 52.

  Thereafter, when a transmission signal 53 specifying the mobile station 30_2 as a destination is wirelessly transmitted from the mobile station 30_1 (step S109), the femto base station 20x transfers the transmission signal 53 to the core network 10 (step S110). .

  The core network 10 reads the location information 52_2 from the VLR or HLR using the identification information of the mobile station 30_2 included in the outgoing signal 53 as a key, and determines the base station where the mobile station 30_2 is located (step S111). As a result, the core network 10 determines that the mobile station 30_2 is located in the femto base station 20x, and transmits an incoming signal 54 to the mobile station 30_2 to the femto base station 20x (step S112).

  The femto base station 20x wirelessly transfers the incoming signal 54 to the mobile station 30_2 (step S113). When the incoming response signal 55 from the mobile station 30_2 is wirelessly received (step S114), the femto base station 20x transfers the incoming response signal 55 to the core network 10 (step S115).

  The core network 10 that has received the incoming response signal 55 transmits the outgoing response signal 56 to the mobile station 30_1 to the femto base station 20x (step S116). The femto base station 20x wirelessly transfers the call response signal 56 to the mobile station 30_1 (step S117).

  Thereby, a call between the mobile stations 30_1-30_2 is connected, and thereafter, the mobile stations 30_1 and 30_2 are in a communication state.

  However, the mobile communication system 1x has a problem that a delay occurs in the call connection processing. This is because various signals pass through the core network 10 redundantly even though the originating mobile station 30_1 and the terminating mobile station 30_2 are located in the same femto base station 20x. Further, not only the call connection process but also a delay occurs in the transmission of communication data.

  A femto base station that addresses this problem is described in, for example, Patent Document 1. The femto base station described in Patent Document 1 executes a call connection process between mobile stations located in its own station instead of the core network.

  Further, for example, Patent Document 2 describes a gateway device that performs call connection processing between mobile stations located in any of a plurality of femto base stations instead of via a core network.

JP-A-10-191445 JP 2004-364054 A

  However, Patent Documents 1 and 2 have a problem that the processing load is high. This is because the femto base station and the gateway apparatus perform signal transfer when making a call to another mobile station located in another radio base station in addition to the call connection processing between the mobile stations located in the femto base station. This is because it is necessary to execute the processing and the signal transfer processing for the incoming call from the other mobile station in parallel.

  Usually, the processing performance of the femto base station and the gateway device is much lower than that of an exchange station or the like in the core network. For this reason, the femto base station and the gateway apparatus are congested due to parallel execution of the call connection process and the signal transfer process, and in the worst case, the femto base station and the gateway apparatus may fall into an inoperable state.

  Therefore, an object of the present invention is to provide a radio base station, a gateway device, and a call connection method and program thereof that can execute call connection processing instead of falling into an inoperable state.

  In order to achieve the above object, a radio base station according to an aspect of the present invention includes a failure detection unit that detects a transmission failure with a core network, and when the transmission failure is detected, instead of the core network, A call connection unit that performs call connection between mobile stations located in the local station.

  A gateway device according to an aspect of the present invention relays communication between a core network and at least one radio base station. The gateway device includes a failure detection unit that detects a transmission failure with the core network, and a call between mobile stations located in the radio base station on behalf of the core network when the transmission failure is detected. A call connection unit for connection.

  A call connection method according to an aspect of the present invention provides a call connection method in a radio base station. In this call connection method, a transmission failure with a core network is detected, and when the transmission failure is detected, a call connection is established between mobile stations located in the radio base station instead of the core network.

  A call connection method according to another aspect of the present invention provides a call connection method in a gateway device that relays communication between a core network and at least one radio base station. In this call connection method, a transmission failure with the core network is detected, and when the transmission failure is detected, a call connection is established between mobile stations located in the radio base station instead of the core network.

  Further, the call connection program according to an aspect of the present invention includes a process for detecting a transmission failure with a core network in a wireless base station, and the wireless base station in place of the core network when the transmission failure is detected. And a process of performing call connection between mobile stations located in the area.

  Furthermore, the call connection program according to another aspect of the present invention includes a process for detecting a transmission failure with the core network in a gateway device that relays communication between the core network and at least one radio base station, When a transmission failure is detected, a process of performing call connection between mobile stations located in the radio base station is executed instead of the core network.

  In the present invention, the call connection process is executed as an alternative only when the signal transfer process by the cooperative operation with the core network is unnecessary. For this reason, the radio base station and the gateway device can operate stably and do not fall into an inoperable state.

1 is a block diagram showing a schematic configuration example of a radio base station and a mobile communication system to which the radio base station according to Embodiment 1 of the present invention is applied. It is the block diagram which showed one specific structural example of the wireless base station which concerns on Embodiment 1 of this invention. It is the sequence diagram which showed the example of a call connection process in the radio | wireless base station which concerns on Embodiment 1 of this invention, and the mobile communication system to which this is applied. FIG. 5 is a sequence diagram showing an example of a transmission failure notification operation in the radio base station according to Embodiment 1 of the present invention and a mobile communication system to which the radio base station is applied. It is the block diagram which showed the other specific structural example of the wireless base station which concerns on Embodiment 1 of this invention. It is the block diagram which showed the schematic structural example of the gateway apparatus which concerns on Embodiment 2 of this invention, and the mobile communication system to which this is applied. It is the block diagram which showed the specific structural example of the gateway apparatus which concerns on Embodiment 2 of this invention. It is the sequence diagram which showed the example of a call connection process in the gateway apparatus which concerns on Embodiment 2 of this invention, and the mobile communication system to which this is applied. It is the sequence diagram which showed the notification operation example of the transmission failure in the gateway apparatus which concerns on Embodiment 2 of this invention, and the mobile communication system to which this is applied. It is a block diagram which shows the structural example of the mobile communication system to which a general femto base station is applied. It is the sequence diagram which showed the example of a call connection process in the mobile communication system to which a general femto base station is applied.

  Hereinafter, a first embodiment of a radio base station according to the present invention will be described with reference to FIGS. A second embodiment of the gateway device according to the present invention will be described with reference to FIGS. In the drawings, the same components are denoted by the same reference numerals, and redundant description is omitted as necessary for the sake of clarity.

[Embodiment 1]
A mobile communication system 1 according to the present embodiment shown in FIG. 1 includes a core network 10, a femto base station 20 connected to the core network 10, and wireless connection to the femto base station 20 to perform desired communication. It consists of m mobile stations 30_1 to 30_m to be performed.

  The femto base station 20 includes a failure detection unit 21 and a call connection unit 22. Among these, when detecting a transmission failure with the core network 10, the failure detection unit 21 provides a signal 60 (hereinafter referred to as a transmission failure detection signal) 60 indicating the transmission failure to the call connection unit 22.

  On the other hand, after receiving the transmission failure detection signal 60, the call connection unit 22 performs call connection between the mobile stations 30_1 to 30_m located in the femto base station 20 instead of the core network 10.

  That is, the femto base station 20 does not need to transfer a transmission signal to another mobile station located in another radio base station to the core network 10, and the other mobile station from the core network 10. The call connection process is executed as an alternative only when the incoming call signal from cannot be transferred. Therefore, the femto base station 20 can operate stably without being congested.

  Hereinafter, specific configuration examples and operation examples of the femto base station 20 will be described in detail with reference to FIGS.

  As illustrated in FIG. 2, the failure detection unit 21 in the femto base station 20 includes a core network I / F 211 and a continuity confirmation unit 212. Among these, the core network I / F 211 is connected to the core network 10 via the wired line 70 and performs signal transmission between the core network 10 and the mobile station 30. Further, the continuity confirmation unit 212 periodically transmits a continuity command (for example, a PING (Packet Internet Grouper) command) 61 to the core network 10 via the I / F 211, and the continuity response 62 is sent from the core network 10 as a response thereto. Receive. If the continuity response 62 cannot be received even after a predetermined time has elapsed since the transmission of the continuity command 61, the continuity confirmation unit 212 determines that a failure has occurred in either the core network 10 or the line 70, and a transmission failure has occurred. A detection signal 60 is generated.

  On the other hand, the call connection unit 22 includes a wireless transceiver 221, a storage medium 222 such as a memory, and a signal processing unit 223. Among these, the radio transmitter / receiver 221 transmits / receives a radio signal to / from the mobile station 30, modulates a baseband signal received from the signal processing unit 223 into a radio signal, and converts a radio signal received from the mobile station 30 to a baseband signal. Is demodulated. When the signal processing unit 223 receives the location registration request 51 (see FIG. 11) from the mobile station 30, the signal processing unit 223 uses the location information 52 included in the location registration request 51 as identification information (ID or telephone number) of the mobile station 30. Etc.) and stored in the storage medium 222. Further, the signal processing unit 223 receives the transmission signal 53 after the transmission failure detection signal 60, and uses the identification information of the destination mobile station included in the transmission signal 53 as a key to obtain the position information 52 from the storage medium 222. If the search is successful, it is determined that the destination mobile station is located in the femto base station 20, and a call is connected between the destination mobile station and the source mobile station.

  Next, an example of call connection processing in the present embodiment will be described with reference to FIG. 3, taking as an example the case where mobile stations 30_1 and 30_2 shown in FIG. 1 perform communication.

  As shown in FIG. 3, when the mobile station 30_1 is located in the femto base station 20 (step S1), the mobile station 30_1 wirelessly transmits a location registration request 51_1 to the femto base station 20 (step S2). The signal processing unit 223 in the femto base station 20 transfers the location registration request 51_1 received by the wireless transceiver 221 to the core network 10 via the core network I / F 211 (step S3). The core network 10 registers the location information 52_1 of the mobile station 30_1 included in the location registration request 51_1 in association with the identification information of the mobile station 30_1 in the VLR or HLR (step S4).

  In parallel with the above step S3, the signal processing unit 223 extracts the position information 52_1 from the position registration request 51_1 and stores it in the storage medium 222 in association with the identification information of the mobile station 30_1 (step S5).

  Similarly, when the mobile station 30_2 is located in the femto base station 20 (step S6), the mobile station 30_2 wirelessly transmits a location registration request 51_2 to the femto base station 20 (step S7). The signal processing unit 223 transfers the location registration request 51_2 to the core network 10 (Step S8). The core network 10 registers the location information 52_2 of the mobile station 30_2 included in the location registration request 51_2 in association with the identification information of the mobile station 30_2 in the VLR or HLR (step S9).

  In parallel with the above step S8, the signal processing unit 223 extracts the position information 52_2 from the position registration request 51_2 and stores it in the storage medium 222 in association with the identification information of the mobile station 30_2 (step S10).

  Thereafter, when a failure occurs in the line 70 shown in FIG. 2, the continuity response 62 from the core network 10 cannot be received, so the continuity confirmation unit 212 detects a transmission failure with the core network 10, and The transmission failure detection signal 60 is given to the signal processing unit 223 (step S11). Upon receiving the transmission failure detection signal 60, the signal processing unit 223 determines that the call connection between the mobile stations 30_1 to 30_m located in the femto base station 20 should be performed thereafter. Although not shown, the signal processing unit 223 performs the same signal transfer process as that in FIG. 11 when there is no transmission failure with the core network 10.

  When the transmission signal 53 designating the mobile station 30_2 as the destination is wirelessly transmitted from the mobile station 30_1 (step S12), the signal processing unit 223 uses the identification information of the mobile station 30_2 included in the transmission signal 53 as a key. The position information 52_2 is retrieved from the storage medium 222. As a result, when the position information 52_2 can be searched, the signal processing unit 223 determines that the mobile station 30_2 is located in the femto base station 20 (step S13), and transmits an incoming signal 54 to the mobile station 30_2 ( Step S14). Although illustration is omitted, if the location information 52_2 cannot be searched, the signal processing unit 223 determines that the mobile station 30_2 is not located in the femto base station 20 (that is, cannot receive an incoming call to the mobile station 30_2). The transmission response signal indicating that the incoming call is not possible is transmitted to the mobile station 30_1.

  Then, when receiving the incoming response signal 55 from the mobile station 30_2 (step S15), the signal processing unit 223 transmits the outgoing response signal 56 to the mobile station 30_1 (step S16).

  Thereby, a call between the mobile stations 30_1-30_2 is connected, and thereafter, the mobile stations 30_1 and 30_2 are in a communication state.

  The signal processing unit 223 preferably operates as shown in FIG. 4 when a transmission failure with the core network 10 is detected by the continuity confirmation unit 212.

  That is, when the signal processing unit 223 receives the transmission failure detection signal 60 in step S11 described above, the signal processing unit 223 notifies the femto base station 20 of a notification (hereinafter referred to as transmission failure detection notification) 57 indicating detection of a transmission failure with the core network 10. Is notified to the cell formed. This transmission failure detection notification 57 may be transmitted wirelessly via a broadcast radio channel using a reserved area in the existing broadcast information, for example.

  In this case, the femto base station 20 can warn the user who owns the mobile station 30 that transmission to other mobile stations located in other radio base stations is not possible. Generation of unnecessary transmission signals to the mobile station is suppressed. For this reason, the processing load of the femto base station 20 can be further reduced.

  The failure detection unit 21 and the call connection unit 22 can be realized by a program. More specifically, as shown in FIG. 5, the processor 23 in the femto base station 20 controls the core network I / F 211 and the wireless transceiver 221 shown in FIG. 2 and is stored in the storage medium 222. Then, the failure detection processing program 24 describing processing equivalent to the continuity confirmation unit 212 and the call connection processing program 25 describing processing equivalent to the signal processing unit 223 are respectively executed. Further, the failure detection processing program 24 and the call connection processing program 25 may be provided as plug-ins to firmware incorporated in an existing control circuit.

[Embodiment 2]
A mobile communication system 1a according to the present embodiment shown in FIG. 6 includes a core network 10, n femto base stations 20x_1 to 20x_n (hereinafter may be collectively referred to as reference numeral 20x), and femto base stations 20x_1 to 20x_1. M mobile stations 30_1 to 30_m that wirelessly connect to any of 20x_n and perform desired communication, and a gateway device 40 that relays communication between the core network 10 and the femto base stations 20x_1 to 20x_n. . The femto base station 20x is the general femto base station shown in FIG. The gateway device 40 only needs to be connected to at least one femto base station.

  The gateway device 40 includes a failure detection unit 41 and a call connection unit 42. Among these, the failure detection unit 41 gives a transmission failure detection signal 60 to the call connection unit 42 when a transmission failure with the core network 10 is detected.

  On the other hand, after receiving the transmission failure detection signal 60, the call connection unit 42 performs call connection between the mobile stations 30_1 to 30_m located in the femto base station 20x instead of the core network 10.

  That is, the gateway device 40 does not need to transfer a transmission signal to another mobile station located in another radio base station to the core network 10, and from the other mobile station from the core network 10. Only when the incoming signal cannot be transferred, the call connection process is executed instead. Therefore, the gateway device 40 can operate stably without being congested.

  Hereinafter, specific configuration examples and operation examples of the gateway device 40 will be described in detail with reference to FIGS. 7 to 9.

  As illustrated in FIG. 7, the failure detection unit 41 in the gateway device 40 includes a core network I / F 211 and a continuity confirmation unit 212 similar to those in FIG. 2. The call connection unit 42 includes a base station I / F 421 that functions as an interface with the femto base station 20x, and a storage medium 222 and a signal processing unit 223 similar to those in FIG. The failure detection unit 41 and the call connection unit 42 can be realized by a program. In this case, a processor (not shown) in the gateway device 40 controls the core network I / F 211 and the wireless transceiver 221 and stores the failure detection processing program 24 and the same as that in FIG. Each of the call connection processing programs 25 is executed. Further, the failure detection processing program 24 and the call connection processing program 25 may be provided as plug-ins to firmware incorporated in an existing control circuit.

  Next, an example of call connection processing in the present embodiment is a case where the mobile station 30_1 located in the femto base station 20x_1 and the mobile station 30_2 located in the femto base station 20x_2 shown in FIG. An example will be described with reference to FIG. The following description is similarly applied when the mobile stations 30_1 and 30_2 are located in the same femto base station.

  As shown in FIG. 8, when the mobile station 30_1 is located in the femto base station 20x_1 (step S21), the mobile station 30_1 wirelessly transmits a location registration request 51_1 to the femto base station 20x_1 (step S22). The femto base station 20x_1 transfers the location registration request 51_1 to the gateway device 40 (step S23). The signal processing unit 223 in the gateway device 40 transfers the location registration request 51_1 received by the base station I / F 421 to the core network 10 via the core network I / F 211 (step S24). The core network 10 registers the location information 52_1 of the mobile station 30_1 included in the location registration request 51_1 in association with the identification information of the mobile station 30_1 in the VLR or HLR (step S25).

  In parallel with step S24 described above, the signal processing unit 223 extracts the position information 52_1 from the position registration request 51_1, and stores it in the storage medium 222 in association with the identification information of the mobile station 30_1 (step S26).

  Similarly, when the mobile station 30_2 is located in the femto base station 20x_2 (step S27), the mobile station 30_2 wirelessly transmits a location registration request 51_2 to the femto base station 20x_2 (step S28). The femto base station 20x_2 transfers the location registration request 51_2 to the gateway device 40 (step S29). The signal processing unit 223 transfers the location registration request 51_2 to the core network 10 (Step S30). The core network 10 registers the location information 52_2 of the mobile station 30_2 included in the location registration request 51_2 in association with the identification information of the mobile station 30_2 in the VLR or HLR (step S31).

  In parallel with the above step S30, the signal processing unit 223 extracts the position information 52_2 from the position registration request 51_2 and stores it in the storage medium 222 in association with the identification information of the mobile station 30_2 (step S32).

  Thereafter, when a failure occurs in the line 70 shown in FIG. 7, the continuity confirmation unit 212 detects a transmission failure with the core network 10, and gives the transmission failure detection signal 60 to the signal processing unit 223 (step S33). Upon receiving the transmission failure detection signal 60, the signal processing unit 223 determines that the call connection between the mobile stations 30_1 to 30_m located in any of the femto base stations 20x_1 to 20x_n should be performed thereafter. Although not shown, the signal processing unit 223 performs the same signal transfer process as that in FIG. 11 when there is no transmission failure with the core network 10.

  Then, when the transmission signal 53 specifying the mobile station 30_2 as a destination is wirelessly transmitted from the mobile station 30_1 (step S34), the femto base station 20x_1 transfers the transmission signal 53 to the gateway device 40 (step S35). The signal processing unit 223 determines whether the mobile station 30_2 is located in any one of the femto base stations 20x_1 to 20x_n in the same manner as in the first embodiment (Step S36). As a result, the signal processing unit 223 determines that the mobile station 30_2 is located in the femto base station 20x_2, and transmits an incoming signal 54 to the mobile station 30_2 to the femto base station 20x_2 (step S37). The femto base station 20x_2 wirelessly transfers the incoming signal 54 to the mobile station 30_2 (step S38). Although illustration is omitted, when it is determined that the mobile station 30_2 does not exist in any of the femto base stations 20x_1 to 20x_n, the signal processing unit 223 receives the incoming call to the mobile station 30_1 via the femto base station 20x_1. A transmission response signal indicating the failure is transmitted.

  When the signal processing unit 223 receives the incoming response signal 55 from the mobile station 30_2 via the femto base station 20x_2 (steps S39 and S40), the signal processing unit 223 transmits the outgoing response signal to the mobile station 30_1 via the femto base station 20x_1. 56 is transmitted (steps S41 and S42).

  Thereby, a call between the mobile stations 30_1-30_2 is connected, and thereafter, the mobile stations 30_1 and 30_2 are in a communication state.

  Further, the signal processing unit 223 preferably operates as shown in FIG. 9 when the conduction check unit 212 detects a transmission failure with the core network 10.

  That is, when the signal processing unit 223 receives the transmission failure detection signal 60 in step S33 described above, the signal processing unit 223 transmits the notification instruction 58 to the femto base stations 20x_1 to 20x_n, thereby notifying the transmission failure detection notification 57. An instruction is given (step S43). Receiving this notification instruction 58, the femto base stations 20x_1 to 20x_n notify the transmission failure detection notification 57 (step S44).

  In this case, the gateway device 40 can warn the user who owns the mobile station 30 that it is impossible to make a call to another mobile station located in another radio base station. Generation of unnecessary transmission signals to the station is suppressed. For this reason, the processing load of the gateway device 40 can be further reduced.

  Note that the present invention is not limited to the above-described embodiments, and it is apparent that various modifications can be made by those skilled in the art based on the description of the scope of the claims.

DESCRIPTION OF SYMBOLS 1, 1a Mobile communication system 10 Core network 20, 20x, 20x_1-20x_n Femto base station 21, 41 Failure detection unit 22, 42 Call connection unit 23 Processor 24 Failure detection processing program 25 Call connection processing program 30, 30_1-30_m Station 40 Gateway device 51, 51_1, 51_2 Location registration request 52, 52_1, 52_2 Location information 53 Outgoing signal 54 Incoming signal 55 Incoming response signal 56 Outgoing response signal 57 Transmission failure detection notification 58 Notification instruction 60 Transmission failure detection signal 61 Continuation command 62 Continuity response 70 line 211 Core network I / F
212 Continuity Confirmation Unit 221 Wireless Transceiver 222 Storage Medium 223 Signal Processing Unit 421 Base Station I / F

Claims (18)

A fault detection unit for detecting a transmission fault with the core network;
When the transmission failure is detected, in place of the core network, a call connection unit that performs call connection between mobile stations located in the own station;
Wireless base station with In claim 1,
The radio base station, wherein the call connection unit notifies the detection of the transmission failure. In claim 1 or 2,
A radio base station characterized in that, when the call connection unit has previously requested location registration from a mobile station on the receiving side, the mobile station on the receiving side determines that the mobile station on the receiving side is within its own area at the time of the call connection. In any one of Claims 1-3,
The radio base station, wherein the transmission failure is a failure that occurs in the core network or a failure that occurs in a line provided between the local station and the core network. A gateway device that relays communication between a core network and at least one radio base station,
A failure detection unit for detecting a transmission failure with the core network;
When the transmission failure is detected, instead of the core network, a call connection unit that performs call connection between mobile stations located in the radio base station,
A gateway device comprising: In claim 5,
The gateway apparatus, wherein the call connection unit causes the radio base station to notify the detection of the transmission failure. In claim 5 or 6,
If the call connection unit has previously requested location registration from the mobile station on the receiving side via the radio base station, it is determined that the mobile station on the call receiving side is in the radio base station at the time of the call connection A gateway device characterized by: In any one of Claims 5-7,
The gateway device according to claim 1, wherein the transmission failure is a failure that occurs in the core network or a failure that occurs in a line provided between the own device and the core network. A call connection method in a radio base station,
Detect transmission failures with the core network,
A call connection method for performing call connection between mobile stations residing in the radio base station in place of the core network when the transmission failure is detected. In claim 9,
A call connection method for notifying the detection of the transmission failure. In claim 9 or 10,
A call connection method characterized in that, when location registration is requested in advance by a mobile station on the called side, it is determined that the mobile station on the called side is located in the radio base station at the time of call connection. In any one of Claims 9-11,
A call connection method characterized by detecting a failure occurring in the core network or a failure occurring in a line provided between the radio base station and the core network as the transmission failure. A call connection method in a gateway device that relays communication between a core network and at least one radio base station,
Detecting a transmission failure with the core network;
A call connection method for performing call connection between mobile stations residing in the radio base station in place of the core network when the transmission failure is detected. In claim 13,
A call connection method, characterized in that the radio base station is notified of detection of the transmission failure. In claim 13 or 14,
When location registration is requested in advance from a mobile station on the receiving side via the radio base station, it is determined that the mobile station on the receiving side is located in the radio base station at the time of the call connection. Call connection method. In any one of Claims 13-15,
A call connection method characterized by detecting a failure that occurs inside the core network or a failure that occurs in a line provided between the gateway device and the core network as the transmission failure. Radio base station
Processing to detect transmission failures with the core network;
When detecting the transmission failure, on behalf of the core network, a process of performing call connection between mobile stations located in the radio base station;
Call connection program for executing A gateway device that relays communication between the core network and at least one radio base station;
A process of detecting a transmission failure with the core network;
When detecting the transmission failure, on behalf of the core network, a process of performing call connection between mobile stations located in the radio base station;
Call connection program for executing

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