JP2020036188A - Communication control device - Google Patents

Abstract

To provide a communication control device capable of reliably communicating and connecting a predetermined type of call signal such as an emergency call.SOLUTION: An MME 100 includes a receiving unit 101 that receives a predetermined type of a call signal (emergency call) from a user terminal, a determination unit 102 that determines whether there is a setting of P-CSCF which is a call processing device that processes a predetermined type of call signal (emergency call) provided by another communication carrier (communications carrier B) when the predetermined type of call signal (emergency call) is received, an acquisition unit 103 that obtains address information of the call processing device from a communication management device of the other communication carrier when it is determined that there is a setting of the call processing device, and a notification unit 104 that notifies the user terminal of the address information acquired by the acquisition unit.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a communication control device that controls communication of a user terminal that roams in.

  The following non-patent document 1 defines an IMS emergency call system as an emergency call processing system during roaming-in of VoLTE communication. In the IMS emergency call system, control is performed by a P-CSCF close to an emergency organization in the visited network. It should be noted that the emergency call is a connection call for connecting to an emergency response organization, and examples of the emergency response organization include a police organization.

3GPP TS23.167

  The IMS emergency call system described in Non-Patent Document 1 uses a P-CSCF (Proxy-Call Session Control Function), which is a communication connection device in a visited network in which a user terminal is located, and a home network of the user terminal. In this method, no communication connection is made with an HSS (Home Subscriber Server). Therefore, the emergency call processing method provided in the visited network may be different from the emergency call processing method provided in the home network of the user terminal, and there may be a difference in the service quality provided. In addition, since a new connection is established between the visited network P-CSCF and the user terminal, a connection test is required between the visited network P-CSCF and the user terminal in order to guarantee emergency call connection. .

  Therefore, in order to solve the above-described problem, an object of the present invention is to provide a communication control device capable of reliably connecting a predetermined type of call signal such as an emergency call.

  In order to solve the above-mentioned problem, a communication control device of the present invention is a communication control device for performing communication control of a user terminal having a network of another communication carrier as a home network. A receiving unit that receives the predetermined type of call signal, and a determination unit that determines whether or not there is a setting of a call processing device for processing the predetermined type of call signal provided by the other communication carrier. Obtaining an address information of the call processing device from the communication management device of the other communication carrier when determining that there is a setting of the call processing device; and address information obtained by the obtaining portion. To the user terminal.

  With this configuration, it is possible to acquire the address information of the call processing device in the home network and notify the user terminal of the acquired address information. The user terminal can use the address information to perform communication connection processing of a predetermined type of call signal in the home network. Therefore, a reliable communication connection of a predetermined type of call signal is enabled.

  ADVANTAGE OF THE INVENTION According to this invention, communication connection can be reliably performed for the call signal of predetermined types, such as an emergency call.

1 is a diagram illustrating a system configuration of a communication system including an MME 100 that is a communication control device according to an embodiment of the present disclosure. FIG. 2 is a block diagram illustrating a functional configuration of the MME 100. 5 is a flowchart illustrating an operation of the MME 100. 7 is a processing sequence by the communication system of the visited network and the communication system of the home network. FIG. 2 is a diagram illustrating an example of a hardware configuration of the MME 100 according to an embodiment of the present disclosure.

  An embodiment of the present invention will be described with reference to the accompanying drawings. When possible, the same parts are denoted by the same reference numerals, and redundant description will be omitted.

  FIG. 1 is a diagram illustrating a system configuration of a communication system including an MME 100 that is a communication control device according to an embodiment of the present disclosure. As shown in the figure, the network configured by the communication system of the communication carrier A includes the MME 100, the PGW 200, and the P-CSCF 300. The network configured by the communication system of the communication carrier B includes the HSS 100a, the PGW 200a, and the P-CSCF 300a.

  The user terminal 50 is a terminal having a network configured by the communication system of the communication carrier B as a home network. Generally, the user terminal 50 is a mobile phone that uses the network of the communication carrier B according to a contract.

  In an embodiment of the present disclosure, a case is considered where the user terminal 50 having the network of the communication carrier B as a home network roams in and moves to the network of the communication carrier A. When the user terminal 50 located in the network of the communication carrier A requests connection of an emergency call, the address of the P-CSCF 300a for performing the emergency call processing from the PGW 200a of the network of the communication carrier B via the MME 100. Get information.

  Then, the user terminal 50 sends an emergency call to the P-CSCF 300a using the acquired address information, and the P-CSCF 300a executes an emergency call process. Therefore, the user terminal 50 can cause the P-CSCF 300a of the home network to process an emergency call.

  Next, a functional configuration of the MME 100 according to the present embodiment will be described. FIG. 2 is a block diagram illustrating a functional configuration of the MME 100. As shown in the drawing, the MME 100 includes a receiving unit 101, a determining unit 102, an acquiring unit 103, and a notifying unit 104.

  The receiving unit 101 is a unit that receives, from the user terminal 50, a connection request (PDN Connectivity Request (Emergency) / Emergency Attach) indicating an emergency call or a normal call from the user terminal 50.

  The determining unit 102 is a unit that determines whether the connection request received by the receiving unit 101 is a request for an emergency call. Further, the determination unit 102 determines whether or not the user terminal has a visited network as a home network based on terminal information or subscriber information (for example, IMSI (International Mobile Subscriber Identity)) included in the connection request. Further, it is determined whether or not the terminal is a user terminal having a network of an overseas telecommunications carrier as a home network (so-called overseas roaming in user terminal). The MME 100 can determine which communication carrier's network is the home network of the user terminal that has requested connection, based on the subscriber information such as the HSS of the communication carrier A (not shown) and the received IMSI.

  Further, the determination unit 102 determines the emergency call provision type of the P-CSCF 300a in the home network of the user terminal 50 (the network of the communication carrier B). That is, it is determined whether or not P-CSCF 300a for processing an emergency call is provided in the home network of user terminal 50. Note that the MME 100 determines whether a P-CSCF for performing emergency call processing is provided in the network of each communication carrier for the emergency call processing of each communication carrier having a roaming contract in advance. Information is stored. The determining unit 102 determines the emergency call provision type of the P-CSCF 300a in the home network of the user terminal 50 based on the information.

  The obtaining unit 103 is a unit that obtains the address information of the P-CSCF 300 or 300a. That is, the acquiring unit 103 selects the PGW 200 or 200a according to the home network of the user terminal 50 that has transmitted the connection request, and acquires the address information of the P-CSCF 300 or 300a from the PGW 200 or 200a.

  When the user terminal 50 is an overseas roaming-in user terminal, the acquisition unit 103 selects the PGW 200 of the visited network and acquires the address information of the P-CSCF 300 in order to use the IMS emergency call method.

  The notifying unit 104 is a unit that transmits the address information of the P-CSCF 300 or the P-CSCF 300a acquired by the acquiring unit 103 to the user terminal 50. The user terminal 50 performs a connection process to the P-CSCF 300 or the P-CSCF 300a using the address information.

  The operation of the MME 100 configured as described above will be described. FIG. 3 is a flowchart showing the operation of the MME 100. In the MME 100, when the receiving unit 101 receives a connection request from the user terminal 50 (S100), the determining unit 102 determines whether or not the connection request is an emergency call transmission (S101). When the determination unit 102 determines that the call is not an emergency call (S101: NO), call control is performed as a general call (S102). That is, the MME 100 performs a P-CSCF address resolution process for a general call using the PGW or the like. In the embodiment of the present disclosure, a general call indicates a call that is not an emergency call.

  When the determination unit 102 determines that the connection request from the user terminal 50 is an emergency call (S101: YES), the user terminal 50 that has transmitted the emergency call is a user terminal having the home network in the visited network. It is determined whether or not there is (S103). The determining unit 102 determines whether or not the user terminal 50 is a user terminal of the visited network based on the IMSI included in the connection request for the emergency call.

  When the determining unit 102 determines that the user terminal 50 is a user terminal whose home network is the visited network (S103: YES), the acquiring unit 103 selects the PGW 200 of the visited network (S104). Then, the obtaining unit 103 obtains the address information of the P-CSF for the emergency call in the visited network from the PGW 200, and the notifying unit 104 transmits the address information to the user terminal 50 to pay out the address information. Perform (S105).

  On the other hand, when determining that the user terminal 50 is not the user terminal having the home network as the home network (S103: NO), the determining unit 102 further determines whether or not the user terminal 50 is an overseas roaming-in user terminal (S106). . Based on the IMSI included in the emergency call, it is determined whether or not the user terminal is an overseas roaming-in user terminal.

  Here, when the determining unit 102 determines that the user terminal 50 is a user terminal roaming in overseas (S106: YES), the acquiring unit 103 selects the PGW 200 of the visited network (S107). The acquiring unit 103 acquires the address information of the P-CSCF 300 for an emergency call in the visited network from the PGW 200, and the notifying unit 104 sends out the address information by transmitting the address information to the user terminal 50 ( S108).

  When judging section 102 judges that user terminal 50 is not an overseas roaming-in user terminal (S106: NO), it determines whether or not there is a P-CSCF connection type for an emergency call in the home network of user terminal 50 (S109). ). Here, if it is determined that the P-CSCF connection type is not set, that is, that the P-CSCF for the emergency call is not set in the home network (S109: No), the process proceeds to S107, and the acquisition unit 103 The PGW 200 in the visited network is selected, and the address information of the P-CSCF 300 for an emergency call in the visited network is obtained.

  On the other hand, when the determination unit 102 determines that the P-CSCF connection type for the emergency call in the home network of the user terminal 50 is set (S109: Yes), the acquisition unit 103 determines The PGW 200a is selected (S110). Then, the acquiring unit 103 acquires the address information of the P-CSCF 300a of the home network, and the notifying unit 104 sends out the acquired address information to the user terminal 50 to pay out the address information (S111). Thereby, the MME 100 can acquire appropriate P-CSCF address information based on which network the user terminal 50 is a home network and whether it is an overseas roaming-in user terminal.

  Next, a processing sequence by the communication system of the visited network and the communication system of the home network will be described with reference to FIG.

  The user terminal 50 transmits a PDN Connectivity Request (Emergency) / Emergency Attach, which is a connection request for an emergency call, to the MME 100 (S201). In the MME 100, the determination unit 102 determines whether the connection request of the roaming-in user terminal 50 is an emergency call according to the above processing (S202). Here, the determination unit 102 determines that the emergency call is from the roaming-in user terminal 50 of the domestic telecommunications carrier, and the acquiring unit 103 determines from the PGW 200a in the home network of the user terminal 50 that the emergency call P -Acquire address information of the CSCF 300a (S203, S204). At this time, the PGW 200a also determines an emergency call.

  In the MME 100, the acquiring unit 103 acquires the address information of the P-CSCF 300a of the home network, and the notifying unit 104 transmits it to the user terminal 50 (S205).

  The user terminal 50 transmits an Emergency Reg to the P-CSCF 300a of the home network using the transmitted address information of the P-CSCF 300a (S206), and performs an EmergencyRegistration process for a user authentication process and the like (S207). . Then, the user terminal 50 transmits a SIP INVITE signal to the emergency agency via the P-CSCF 300a (S208, 209).

  Next, the operation and effect of the MME 100 which is the communication control device according to the embodiment of the present disclosure will be described. The MME 100 according to an embodiment of the present disclosure is a communication control device that controls communication of user terminals including a user terminal 50 having a network of another communication carrier (for example, communication carrier B) as a home network.

  The MME 100 receives a call signal (emergency call) of a predetermined type from the user terminal 50 and, when receiving a call signal (emergency call) of a predetermined type, another communication carrier (communication carrier B) There is a determination unit 102 that determines whether or not there is a setting of a P-CSCF 300a that is a call processing device for processing a predetermined type of call signal (emergency call) to be provided, and a setting of this call processing device (P-CSCF 300a). When it is determined that the address information of the call processing device (P-CSCF 300a) is obtained from the communication management device (PGW 200a) of another communication carrier (communication carrier B), the acquiring unit 103 And a notifying unit 104 for notifying the user terminal 50 of the address information obtained by the user terminal 50.

  With this configuration, when a predetermined type of call signal such as an emergency call is received from the user terminal 50, a call processing device for processing the predetermined type of call signal from the communication carrier B which is the home network of the user terminal 50 ( The address information of the P-CSCF 300a) is obtained and notified to the user terminal 50. Therefore, the user terminal 50 can perform a communication connection process using the address information. In this case, the user terminal 50 is connected to the P-CSCF 300a, which is a call processing device in the home network, to perform a reliable connection process without performing a connection test with the visited network P-CSCF.

  When the determining unit 102 determines that there is no call processing device setting in the home network of the user terminal, the acquiring unit 103 sends an emergency call from the communication management device (PGW 200) of the communication carrier A in the visited network. The address information of the call processing device (P-CSCF 300) for processing a call signal of a predetermined type such as a call signal is acquired.

  With this configuration, communication connection processing for an emergency call or the like can be performed even when there is no setting of a call processing device that performs processing for an emergency call or the like in the home network.

  Further, in MME 100 according to an embodiment of the present disclosure, determination unit 102 further determines whether or not user terminal 50 is a terminal that has roamed in from the network of the overseas operator. The determination unit 102 determines that the user terminal is a terminal that has roamed in from the overseas operator's network, or that determines that the user terminal is not a terminal that has roamed in from the overseas operator's network, When it is determined that there is no setting of the call processing device (P-CSCF 300a) by the caller (communication carrier B), the acquisition unit 103 transmits the communication management device of the network (network of the communication carrier A) in which the network is located. From the (PGW 200), address information of a call processing device (P-CSCF 300) for processing a call signal of a predetermined type is obtained.

  Thereby, when there is no setting of the emergency call P-CSCF 300a in the overseas roaming-in terminal or the home network, the address information of the P-CSCF 300 in the visited network is obtained, and the user terminal performs the communication connection process. be able to.

  Generally, if a user terminal (domestic roaming-in terminal) having a home network of another telecommunications carrier in Japan is located in another telecommunications carrier's network in the same country, The distance between the visited network and the home network is short. On the other hand, when a user terminal (overseas roaming-in terminal) that uses the network of an overseas telecommunications carrier as a home network is located in a network of a domestic (for example, Japan) telecommunications carrier, the home network is The distance to the area network is far.

  In the case of handling an emergency call from a roaming-in terminal (regardless of domestic or overseas), the standardized technology described in the above-described prior art should be complied with. (Emergency call processing in home network) may be advantageous.

  The block diagram used in the description of the above-described embodiment shows blocks in functional units. These functional blocks (components) are realized by an arbitrary combination of at least one of hardware and software. In addition, a method of implementing each functional block is not particularly limited. That is, each functional block may be realized using one device physically or logically coupled, or directly or indirectly (for example, two or more devices physically or logically separated from each other). , Wired, wireless, etc.), and may be implemented using these multiple devices. The functional block may be realized by combining one device or the plurality of devices with software.

  Functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, deemed, Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, but not limited to these I can't. For example, a functional block (configuration unit) that causes transmission to function is called a transmitting unit (transmitting unit) or a transmitter (transmitter). In any case, as described above, the realization method is not particularly limited.

  For example, the MME 100 or the like according to an embodiment of the present disclosure may function as a computer that performs processing of the communication control method of the present disclosure. FIG. 5 is a diagram illustrating an example of a hardware configuration of the MME 100 according to an embodiment of the present disclosure. The above-described MME 100 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

  In the following description, the term “apparatus” can be read as a circuit, a device, a unit, or the like. The hardware configuration of the MME 100 may be configured to include one or more devices shown in the drawing, or may be configured without including some devices.

  The functions of the MME 100 are performed by reading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs an operation and controls communication by the communication device 1004, and controls the communication by the communication device 1004 and the memory 1002 and the storage device. It is realized by controlling at least one of data reading and writing in 1003.

  The processor 1001 controls the entire computer by operating an operating system, for example. The processor 1001 may be configured by a central processing unit (CPU) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like. For example, the above-described determination unit 102 and the like may be realized by the processor 1001.

  In addition, the processor 1001 reads a program (program code), a software module, data, and the like from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operation described in the above embodiment is used. For example, the determination unit 102 may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and the other function blocks may be similarly realized. Although it has been described that the various processes described above are executed by one processor 1001, the processes may be executed simultaneously or sequentially by two or more processors 1001. Processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via a telecommunication line.

  The memory 1002 is a computer-readable recording medium, and includes, for example, at least one of a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), and a RAM (Random Access Memory). May be done. The memory 1002 may be called a register, a cache, a main memory (main storage device), or the like. The memory 1002 can store a program (program code), a software module, and the like that can be executed to execute the communication control method according to an embodiment of the present disclosure.

  The storage 1003 is a computer-readable recording medium such as an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, and a magneto-optical disk (eg, a compact disk, a digital versatile disk, a Blu-ray). (Registered trademark) disk, a smart card, a flash memory (eg, card, stick, key drive), a floppy (registered trademark) disk, a magnetic strip, or the like. The storage 1003 may be called an auxiliary storage device. The above-described storage medium may be, for example, a database including at least one of the memory 1002 and the storage 1003, a server, or another appropriate medium.

  The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like. The communication device 1004 includes a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like, for example, in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). May be configured. For example, the above-described reception unit 101, acquisition unit 103, notification unit 104, and the like may be realized by the communication device 1004. The receiving unit 101 and the notifying unit 104 may be physically or logically separated from each other.

  The input device 1005 is an input device that receives an external input (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, and the like). The output device 1006 is an output device that performs output to the outside (for example, a display, a speaker, an LED lamp, and the like). Note that the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

  Each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using a different bus for each device.

  The MME 100 includes hardware such as a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array). Alternatively, some or all of the functional blocks may be realized by the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

  The notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using another method. For example, the information is notified by physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), higher layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, Broadcast information (MIB (Master Information Block), SIB (System Information Block))), other signals, or a combination thereof may be used. Further, the RRC signaling may be called an RRC message, and may be, for example, an RRC connection setup message, an RRC connection reconfiguration message, or the like.

  Each aspect / embodiment described in the present disclosure is applicable to LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system). system), FRA (Future Radio Access), NR (new Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark) )), Systems utilizing IEEE 802.16 (WiMAX®), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), and other suitable systems, and extensions based thereon. It may be applied to at least one of the next generation systems. Further, a plurality of systems may be combined (for example, a combination of at least one of LTE and LTE-A with 5G) and applied.

  The processing procedure, sequence, flowchart, and the like of each aspect / embodiment described in the present disclosure may be rearranged as long as there is no inconsistency. For example, for the methods described in this disclosure, elements of various steps are presented in an exemplary order, and are not limited to the specific order presented.

  The specific operation described as being performed by the base station in the present disclosure may be performed by its upper node in some cases. In a network consisting of one or more network nodes having a base station, various operations performed for communication with the terminal may be performed by the base station and other network nodes other than the base station (eg, MME or It is clear that this can be done by at least one of S-GW or the like (but not limited to these). In the above, the case where the number of other network nodes other than the base station is one is illustrated, but a combination of a plurality of other network nodes (for example, MME and S-GW) may be used.

  Information and the like can be output from an upper layer (or lower layer) to a lower layer (or upper layer). Input and output may be performed via a plurality of network nodes.

  The input and output information and the like may be stored in a specific place (for example, a memory) or may be managed using a management table. Information that is input and output can be overwritten, updated, or added. The output information or the like may be deleted. The input information or the like may be transmitted to another device.

  The determination may be made based on a value represented by 1 bit (0 or 1), a Boolean value (Boolean: true or false), or a comparison of numerical values (for example, a predetermined value). Value).

  Each aspect / embodiment described in the present disclosure may be used alone, may be used in combination, or may be switched and used with execution. Further, the notification of the predetermined information (for example, the notification of “X”) is not limited to being explicitly performed, and is performed implicitly (for example, not performing the notification of the predetermined information). Is also good.

  While the present disclosure has been described in detail, it will be apparent to one skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented as modified and changed aspects without departing from the spirit and scope of the present disclosure defined by the description of the claims. Therefore, the description of the present disclosure is intended for illustrative purposes, and has no restrictive meaning to the present disclosure.

  Software, regardless of whether it is called software, firmware, middleware, microcode, a hardware description language, or any other name, instructions, instruction sets, codes, code segments, program codes, programs, subprograms, software modules , Applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like.

  In addition, software, instructions, information, and the like may be transmitted and received via a transmission medium. For example, if the software uses at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.), When transmitted from a server or other remote source, at least one of these wired and / or wireless technologies is included within the definition of a transmission medium.

  The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., that can be referred to throughout the above description are not limited to voltages, currents, electromagnetic waves, magnetic or magnetic particles, optical or photons, or any of these. May be represented by a combination of

  Note that terms described in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meaning. For example, at least one of the channel and the symbol may be a signal (signaling). Also, the signal may be a message. Further, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, or the like.

  The terms "system" and "network" as used in this disclosure are used interchangeably.

  Further, the information, parameters, and the like described in the present disclosure may be expressed using an absolute value, may be expressed using a relative value from a predetermined value, or may be expressed using another corresponding information. May be represented. For example, the radio resource may be indicated by an index.

  The names used for the parameters described above are not limiting in any way. Further, equations and the like using these parameters may differ from those explicitly disclosed in the present disclosure. The various channels (eg, PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, so that the various names assigned to these various channels and information elements are limited in any respect. is not.

  In the present disclosure, “base station (BS)”, “wireless base station”, “fixed station”, “NodeB”, “eNodeB (eNB)”, “gNodeB (gNB)”, “ "Access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", " Terms such as "carrier" and "component carrier" may be used interchangeably. A base station may be referred to by a term such as a macro cell, a small cell, a femto cell, a pico cell, and the like.

A base station can accommodate one or more (eg, three) cells. If the base station accommodates multiple cells, the entire coverage area of the base station can be partitioned into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station (RRH: The communication service can also be provided by a Remote Radio Head.The term “cell” or “sector” is a part or the whole of a coverage area of at least one of a base station and a base station subsystem that provide communication service in this coverage. Point to.

  In the present disclosure, terms such as “Mobile Station (MS)”, “user terminal”, “User Equipment (UE)”, “terminal” and the like may be used interchangeably. .

  A mobile station can be a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, by one of ordinary skill in the art. It may also be called a terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable term.

  At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, or the like. Note that at least one of the base station and the mobile station may be a device mounted on the mobile unit, the mobile unit itself, or the like. The moving object may be a vehicle (for example, a car, an airplane, or the like), may be an unmanned moving object (for example, a drone, an autonomous vehicle), or may be a robot (maned or unmanned). ). Note that at least one of the base station and the mobile station includes a device that does not necessarily move during a communication operation. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

  Further, the base station in the present disclosure may be replaced with a user terminal. For example, communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (for example, may be called D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). Each aspect / embodiment of the present disclosure may be applied to the configuration. In this case, the configuration may be such that the user terminal 50 has the function of the above-described base station. Further, words such as “up” and “down” may be read as words corresponding to communication between terminals (for example, “side”). For example, an uplink channel, a downlink channel, and the like may be replaced with a side channel.

  Similarly, a user terminal in the present disclosure may be replaced with a base station. In this case, a configuration may be adopted in which the base station has the function of the user terminal 50 described above.

The terms "determining" and "determining" as used in the present disclosure may encompass a wide variety of operations. `` Judgment '', `` decision '', for example, judgment (judging), calculation (calculating), calculation (computing), processing (processing), derivation (deriving), investigating (investigating), searching (looking up, search, inquiry) (E.g., searching in a table, database, or another data structure), ascertaining may be considered "determined", "determined", and the like. Also, “determining” and “deciding” include receiving (eg, receiving information), transmitting (eg, transmitting information), input (input), output (output), and access. (accessing) (for example, accessing data in a memory) may be regarded as “determined” or “determined”. In addition, `` judgment '' and `` decision '' means that resolving, selecting, selecting, establishing, establishing, comparing, etc. are considered as `` judgment '' and `` decided ''. May be included. In other words, “judgment” and “decision” may include deeming any operation as “judgment” and “determined”. “Judgment (determination)” may be read as “assuming”, “expecting”, “considering”, or the like.

  The terms "connected," "coupled," or any variation thereof, mean any direct or indirect connection or connection between two or more elements that It may include the presence of one or more intermediate elements between the two elements "connected" or "coupled." The coupling or connection between the elements may be physical, logical, or a combination thereof. For example, “connection” may be read as “access”. As used in this disclosure, two elements may be implemented using at least one of one or more wires, cables, and printed electrical connections, and as some non-limiting and non-exhaustive examples, in the radio frequency domain. , Can be considered "connected" or "coupled" to each other using electromagnetic energy having wavelengths in the microwave and optical (both visible and invisible) regions, and the like.

  The phrase "based on" as used in the present disclosure does not mean "based solely on" unless stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

  Where the terms “include”, “including” and variations thereof are used in the present disclosure, these terms are as inclusive as the term “comprising” Is intended. Further, the term "or" as used in the present disclosure is not intended to be an exclusive or.

  In the present disclosure, where articles are added by translation, for example, a, an and the in English, the present disclosure may include that the nouns following these articles are plural.

  In the present disclosure, the term “A and B are different” may mean that “A and B are different from each other”. The term may mean that “A and B are different from C”. Terms such as "separate" and "coupled" may be construed similarly to "different."

50: user terminal, 100: MME, 101: receiving unit, 102: determining unit, 103: obtaining unit, 104: notification unit, 200, 200a: PGW, 300, 300a: P-CSCF.

Claims (4)

In a communication control device that performs communication control of a user terminal having a network of another communication carrier as a home network,
A receiving unit that receives a predetermined type of call signal from the user terminal,
When receiving the call signal of the predetermined type, a determination unit that determines whether there is a setting of a call processing device for processing the call signal of the predetermined type provided by the other communication carrier,
When it is determined that there is a setting of the call processing device, an acquisition unit that obtains the address information of the call processing device from the communication management device of the other communication carrier,
Notifying unit that notifies the user terminal of the address information obtained by the obtaining unit,
A communication control device comprising:   The communication control device according to claim 1, wherein the predetermined type of call signal is an emergency call for communication connection to an emergency agency.   When the acquisition unit determines that there is no setting of the call processing device, from the communication management device of the communication carrier in the visited network, the address information of the call processing device for processing a predetermined type of call signal is obtained. The communication control device according to claim 1, wherein the communication control device acquires the information. The determination unit is
Determine whether the user terminal is a terminal that has roamed in from the network of the overseas operator,
If it is determined that the user terminal is a terminal that has roamed in from the overseas operator's network, or if the user terminal is not a terminal that has roamed in from the overseas operator's network, When it is determined that there is no setting of the call processing device,
The acquisition unit,
From a communication management device of a communication carrier of the visited network, obtain address information of a call processing device for processing the predetermined type of call signal,
The communication control device according to claim 1.

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