WO2016104311A1

WO2016104311A1 - Wireless communication terminal, communication control method, and network device

Info

Publication number: WO2016104311A1
Application number: PCT/JP2015/085317
Authority: WO
Inventors: 慎吾片桐; 和也金野; 裕二井口
Original assignee: 京セラ株式会社
Priority date: 2014-12-25
Filing date: 2015-12-17
Publication date: 2016-06-30

Abstract

The present invention relates to a wireless communication terminal, and is provided with a control unit, which requests a network device to execute emergency data communication, receives a service quality class identifier (QCI) transmitted from the network device corresponding to the request, said service quality class identifier corresponding to the emergency data communication, and performs emergency data communication processing via the network device on the basis of the service quality class identifier.

Description

Wireless communication terminal, communication control method, and network device

The present invention relates to a wireless communication terminal, a communication control method, and a network device, and more particularly, wireless communication that realizes QoS sufficient for data communication when urgency and / or real-time performance is required, such as emergency use. The present invention relates to a terminal, a communication control method, and a network device.

As a next generation wireless communication system, LTE (Long Term Evolution) system has been standardized by 3GPP (3rd Generation Partnership Project). The LTE system includes a UE (User Equipment) that is a radio communication terminal, an eNB (evolved Node B) that is a radio communication base station, and an EPC (Evolved Packet Core) that is an IP (Internet Protocol) -based core network. Has been. In this specification, a radio communication base station is abbreviated as “base station”, and a radio communication terminal is abbreviated as “terminal”.

In the LTE system, VoLTE (Voice over LTE) that realizes connection of voice communication calls via a network based on the Internet protocol (IP) is regulated. A procedure for handling high priority emergency calls with the highest priority is defined. The voice at the time of VoLTE is recognized as an application that is difficult to be cut off, and the priority 1 that is the highest priority in QCI (Quality of service class identifier) is assigned. As a result, the transmission speed is also guaranteed and can be used stably. Note that the emergency call processing procedure in VoLTE is disclosed in Patent Document 1. On the other hand, data communication (for example, a TCP-based service / application defined in 3GPP TS23.203 rel.12.) Has a lower priority (Priority Level) than other applications (for example, VoIP, VoLTE). QCI (QoS) without priority bits (GBR: Guaranteed bit rate) is assigned (

priorities

6, 8, and 9).

International Publication No. 2014/050345

As described above, in the LTE system, QCI (QoS) with low priority and no guaranteed bit rate is assigned to data communication. If it is normal data communication (thing which does not require real-time property or urgency, for example, web browsing), there is no problem even with QoS corresponding to the QCI.

However, unlike normal data communication, even when performing data communication that requires urgency and / or real-time characteristics, such as emergency use (for example, transmission of a video about an accident situation), A similar QoS corresponding to the above QCI may not be sufficient.

The present invention has been made to solve the above-described problems, and realizes QoS sufficient for data communication in data communication when urgency and / or real-time performance is required, such as emergency use. With the goal.

One aspect of a wireless communication terminal according to the present invention requests a network device to perform emergency data communication, and a service quality class corresponding to the emergency data communication transmitted from the network device in response to the request A control unit is provided that receives an identifier (QCI) and performs a process of performing the emergency data communication via the network device based on the service quality class identifier.

In one aspect of the wireless communication terminal according to the present invention, the service quality class identifier corresponding to the emergency data communication is a service quality class identifier dedicated to the emergency data communication.

One aspect of the wireless communication terminal according to the present invention includes a service quality class identifier dedicated to the emergency data communication, wherein the service quality class identifier dedicated to the emergency data communication is stored in a memory of the network device. Assigned based on the QCI characteristic table.

In one aspect of the wireless communication terminal according to the present invention, the service quality class identifier corresponding to the emergency data communication is a service quality class identifier shared with other applications.

In one aspect of the wireless communication terminal according to the present invention, the service quality class identifier also used as the other application is stored in a memory of the network device, and the other application And the QCI characteristic table including the emergency data communication.

In one aspect of the wireless communication terminal according to the present invention, at least a higher priority than normal data communication is assigned to the service quality class identifier corresponding to the emergency data communication.

In one aspect of the wireless communication terminal according to the present invention, the control unit performs a process of requesting execution of emergency data communication to the network device when an emergency call is transmitted.

In one aspect of the wireless communication terminal according to the present invention, when the control unit requests the network device to execute the emergency data communication, the PDN Connectivity Request corresponding to the emergency data communication is transmitted to the network device. Performs transmission processing to the device.

In one aspect of the wireless communication terminal according to the present invention, the PDN Connectivity Request corresponding to the emergency data communication is a PDN Connectivity Request including a specific access point name (APN) corresponding to the emergency data communication.

In one aspect of the wireless communication terminal according to the present invention, the control unit transmits a PDN Connectivity Request corresponding to the emergency call when an emergency call is made, and then the PDN Connectivity corresponding to the emergency data communication. Processing to send a Request is performed.

One aspect of the wireless communication terminal according to the present invention is a process in which the control unit transmits a PDN Connectivity Request corresponding to the emergency call and corresponding to the emergency data communication when an emergency call is made. Do.

In one aspect of the wireless communication terminal according to the present invention, when executing emergency data communication, the network device is requested to execute another application corresponding to the emergency data communication, and in response to the request Control that receives a quality of service class identifier (QCI) corresponding to the other application transmitted from the network device, and performs a process of communicating the emergency data via the network device based on the service quality class identifier A part.

In one aspect of the communication control method according to the present invention, the wireless communication terminal requests the network device to execute emergency data communication (a), and the network device corresponds to the emergency data communication. (B) transmitting a quality of service class identifier (QCI) to the wireless communication terminal; and when the wireless communication terminal receives the quality of service class identifier (QCI), based on the quality of service class identifier, the network And (c) performing the emergency data communication through a device.

In one aspect of the network device according to the present invention, when a request for execution of emergency data communication is received from a wireless communication terminal, the wireless communication terminal corresponding to the emergency data communication responds to the request by the emergency communication A control unit is provided for performing a process of transmitting a quality of service class identifier (QCI) to be used for data communication to the wireless communication terminal.

According to the present invention, in data communication when urgency and / or real-time property is required, such as emergency use, QoS sufficient for the data communication can be realized.

It is a figure explaining the structure of a LTE system. It is a block diagram of UE in an LTE system. It is a block diagram of MME / S-GW in an LTE system. It is a figure explaining the general control procedure when an emergency call is transmitted from UE. It is a figure which shows a basic QCI characteristic table. FIG. 10 is a diagram illustrating a control procedure when emergency data is transmitted from a UE in the LTE system according to the first embodiment. 3 is a diagram illustrating a QCI characteristic table used in the LTE system according to Embodiment 1. FIG. 6 is a diagram showing a QCI characteristic table used in the LTE system according to the first modification of the first embodiment. FIG. In the LTE system of the modification 1 of Embodiment 1, it is a figure which shows the control procedure when emergency data are transmitted from UE. FIG. 10 is a diagram illustrating a control procedure when emergency data is transmitted from the UE in the LTE system according to the second modification of the first embodiment. FIG. 10 is a diagram illustrating a control procedure when an emergency call is transmitted from a UE in the LTE system according to the second embodiment. FIG. 10 is a diagram illustrating a control procedure when an emergency call is transmitted from a UE in an LTE system according to a modification of the second embodiment.

(Introduction)
Prior to the description of the embodiments, the LTE system will be described. FIG. 1 is a configuration diagram of an LTE system. As shown in FIG. 1, the LTE system includes a UE 100, an E-UTRAN (Evolved-UMTS Terrestria 1 Radio Access Network) 10, and an EPC 20. The E-UTRAN 10 corresponds to a radio access network, and the EPC 20 corresponds to a core network. The E-UTRAN 10 and the EPC 20 constitute an LTE system network.

The UE 100 is a mobile radio communication terminal and performs radio communication with a connection destination cell (serving cell). UE100 is corresponded to a user terminal.

The E-UTRAN 10 includes a plurality of eNBs 200 (200-1, 200-2, 200-3). The eNB 200 manages one or a plurality of cells, and performs radio communication with the UE 100 that establishes a connection with a cell managed by the eNB 200. Note that “cell” is used as a term indicating a minimum unit of a radio communication area, and also as a term indicating a function of performing radio communication with the UE 100.

The eNB 200 has, for example, a radio resource management (RRM) function, a user data routing function, and a measurement control function for mobility control and scheduling.

The EPC 20 includes a plurality of MME (Mobility Management Entity) / S-GW (Serving-Gateway) 300 (300-1, 300-2).

The MME is a network node that performs various types of mobility control for the UE 100, and corresponds to a control station. The S-GW is a network node that performs transfer control of user data, and corresponds to an exchange.

The eNB 200 is connected to each other via the interface X2. The eNB 200 is connected to the MME / S-GW 300 via the interface S1.

FIG. 2 is a block diagram showing the configuration of the UE 100. As shown in FIG. 2, the UE 100 includes a plurality of antennas 101, a radio transceiver 110, a user interface 120, a GNSS (Global Navigation Satellite System) receiver 130, a battery 140, a memory 150, and a processor 160. Have. Note that the UE 100 may not have the GNSS receiver 130. Further, the memory 150 may be integrated with the processor 160, and this set (that is, a chip set) may be used as the processor 160 ′.

The plurality of antennas 101 and the wireless transceiver 110 are used for transmitting and receiving wireless signals. The radio transceiver 110 includes a transmission unit 111 that converts a baseband signal (transmission signal) output from the processor 160 into a radio signal and transmits the radio signal from a plurality of antennas 101. The radio transceiver 110 includes a receiving unit 112 that converts radio signals received by the plurality of antennas 101 into baseband signals (received signals) and outputs the baseband signals to the processor 160.

The user interface 120 is an interface with a user who owns the UE 100, and includes, for example, a display, a microphone, a speaker, and various buttons. The user interface 120 receives an operation from the user and outputs a signal indicating the content of the operation to the processor 160.

The GNSS receiver 130 receives a GNSS signal and outputs the received signal to the processor 160 in order to obtain position information indicating the geographical position of the UE 100. The battery 140 stores power to be supplied to each block of the UE 100.

The memory 150 stores a program executed by the processor 160 and information used for processing by the processor 160. The processor 160 includes a signal processing unit 161 that performs signal processing such as modulation / demodulation and encoding / decoding of a baseband signal, and a control unit 162 that executes various programs by executing programs stored in the memory 150. Contains.

The control unit 162 performs a process for making an emergency call based on an operation through the user interface 120, which will be described later, and performs an emergency data communication under the control of the MME / S-GW. Control.

FIG. 3 is a block diagram showing the configuration of the MME / S-GW 300. As shown in FIG. 3, the MME / S-GW 300 includes a network interface 220, a memory 230, and a processor 240.

The network interface 220 is connected to the eNB 200 via the interface S1 (FIG. 1).

The memory 230 stores a program executed by the processor 240 and information used for processing by the processor 240. The processor 240 includes a control unit 241 that receives an emergency call transmitted from the UE and performs a control operation for controlling the UE, and executes various controls for the UE described later.

Next, a control procedure when an emergency call is transmitted from the UE in the above-described LTE system will be described with reference to FIG. In FIG. 4, the eNB and the MME / S-GW are collectively described as a network device (NW).

As shown in FIG. 4, when an emergency call is made in a UE in an idle state, for example, by a call origination operation to the police, the UE and the eNB execute RRC Connection establishment processing S1. In the RRC connection establishment process S1, the UE transmits an RRC connection request with the cause being “Emergency” to the eNB.

The RRC Connection establishment process S1 includes a procedure in which the eNB that has received the RRC Connection Request transmits the RRC Connection Setup to the UE, and the UE transmits the RRC Connection Setup Complete to the eNB, but the illustration is omitted. Further, although a default bearer establishment process for establishing a voice bearer (communication path) via the eNB with the MME / S-GW is executed subsequent to the RRC connection, illustration is omitted.

After the default bearer establishment process for establishing the voice bearer enables the UE and the MME / S-GW to exchange data, the PDN connection request process S2 is executed. In the PDN connection request process S2, the UE transmits a PDN Connectivity Request with Req_type as Emergency to the MME / S-GW via the eNB.

Upon receiving the PDN Connectivity Request, the MME / S-GW executes a Default Bearer establishment process S3 for establishing a bearer for IMS signaling related to an emergency call (control signal related to call control), and Activate Default EPS BearerCerterCaster The QCI value is included in the Request message and transmitted to the UE. Here, QCI = 5 corresponding to IMS signaling for managing voice communication is assigned.

In the default bearer establishment process S3 for establishing a bearer for IMS signaling related to an emergency call, the MME / S-GW transmits an E-RAB Setup Request to the eNB, and the eNB transmits an RRC Connection Reconfiguration to the UE. Also included is a procedure in which the UE transmits an RRC Connection Reconfiguration Complete to the eNB, and the eNB transmits an E-RAB Setup Response to the MME / S-GW, but illustration is omitted.

Next, the MME / S-GW executes a dedicated bearer establishment process S4 for establishing a bearer for voice data related to an emergency call, and includes the QCI value in the Activate Dedicated EPS Bearer Request Request message to the UE. Send. Here, QCI = 1 corresponding to VoIP (Voice over IP) is assigned.

In the Dedicated Bearer establishment process S4 for establishing a bearer for voice data related to an emergency call, the MME / S-GW sends an E-RAB Setup Request to the eNB, and the eNB sends an RRC Connection Reconfiguration to the UE. Also included is a procedure in which the UE transmits an RRC Connection Reconfiguration Complete to the eNB, and the eNB transmits an E-RAB Setup Response to the MME, which is not shown. Voice communication by VoLTE is started through the above procedure.

FIG. 5 shows a basic (standard) QCI characteristic table. In FIG. 5, whether bit rate is guaranteed (GBR, Non-GBR), priority (Priority （Level), packet delay budget (Packet Delay Budget), packet error loss rate (PELR) associated with the QCI value : Packet Error Loss Rate) and application (service) are shown.

As shown in FIG. 5, VoIP (VoLTE) is assigned the second priority level 2. As a result, the transmission speed is also guaranteed and can be used stably.

(Embodiment 1)
Hereinafter, the LTE system according to the first embodiment will be described with reference to FIGS. FIG. 6 is a diagram illustrating a control procedure when the UE transmits emergency data in the LTE system according to the first embodiment. In FIG. 6, eNB and MME / S-GW are collectively described as a network device (NW).

As shown in FIG. 6, in a UE in an idle state, an operation for emergency data transmission (emergency data communication start) is performed via the user interface 120 (FIG. 3) or an emergency When a specific event that triggers data transmission occurs, the UE and the eNB execute an RRC connection establishment process S11. In the RRC connection establishment process S11, the UE transmits an RRC connection request with the cause being “Emergency” to the eNB.

Here, the specific event that triggers the emergency data transmission is, for example, an emergency application. The emergency application here is, for example, an in-vehicle camera device that has a communication function mounted on a vehicle and has an acceleration sensor or the like. This is an application that detects this with an acceleration sensor and transmits the image data before and after receiving an impact as emergency data to an external server or the like via a network device. The emergency data transmission executed by this application is performed from the necessity of urgently transmitting the image data to an external server because there is a possibility that the in-vehicle camera device may be subsequently damaged in the case of a car accident.

In addition, although UE is used as the vehicle-mounted camera device here, the present invention is not limited to this, and the UE may be a communication module that transmits data received from the vehicle-mounted camera device via wire or wirelessly. Further, the acceleration sensor may not be provided in the in-vehicle camera device, but may be provided outside and configured to transmit the detection result to the in-vehicle camera device.

In addition, in RRC Connection establishment process S11, there is also transmission of RRC Connection Setup from the eNB to the UE and transmission of RRC Connection Setup Complete from the UE to the eNB, but illustration is omitted.

When the UE performs emergency data communication (transmits emergency data), for example, when a traffic accident occurs, a photo or video of the accident site is transmitted, in the PDN connection request processing S12, PDN with Req_type as Emergency When transmitting the Connectivity Request to the MME / S-GW via the eNB, a specific access point name (APN: Access Point Name) is included in the PDN Connectivity Request and transmitted.

Here, the APN included in the PDN Connectivity Request is specified for emergency data communication by a network operator (communication carrier) or the like. The MME / S-GW determines whether the APN included in the PDN Connectivity Request is compatible with emergency data communication. This determination is performed by the MME / S-GW using, for example, a table stored in the memory 230 (FIG. 3). If the MME / S-GW determines that the APN supports emergency data communication, for example, based on the QCI characteristic table shown in FIG. 7, a dedicated bearer is established to allocate a bearer for emergency data communication. Process S13 is performed and the bearer (QCI) matched with the emergency data communication (application) is allocated. In FIG. 6, it is assumed that the UE is in an idle state. However, the present invention is not limited to this, and the UE may be in a null state or a connected state, and the UE is in a connected state. In this case, the transmission of the RRC Connection Request by the UE may be omitted.

In the QCI characteristic table shown in FIG. 7, the QCI has a value of 1 to 10 and the priority has a value of 1 to 10 due to the addition of the TCP protocol (emergency data communication) as an application. . Although described as TCP protocol (emergency data communication), the present invention is not limited to this, and may be simply emergency data communication, and the emergency data communication may include the UDP protocol.

In other words, the emergency data communication is assigned as a bit rate guaranteed (GBR) when QCI = 5, and the priority thereof is set lower than that of VoIP (VoLTE) and higher than that of the real-time game. . The packet delay budget is 150 ms, and the packet error loss rate is 10 ⁻³ . Needless to say, these values are only examples and may be changed to other values. Further, since the emergency data communication is assigned to QCI = 5, the value of QCI = 5 or more in FIG. 5 is increased by one, and the value of priority 3 or more in FIG. 5 is increased by one. This is the same as FIG.

Using such a QCI characteristic table, when executing the Dedicated Bearer establishment process S13 for establishing the bearer for emergency data communication, the MME / S-GW displays the figure in the Activate Dedicated EPS Bearer Context Request message. 7 including the value of QCI = 5 determined based on the QCI characteristic table shown in FIG.

When QCI = 5, the priority is 3, so emergency data communication can be performed with priority over real-time games and normal data communication, and the GBR is also set, so the transmission speed is guaranteed and stable. It can be used.

(Modification 1)
In Embodiment 1 described above, when the UE performs emergency data communication, the MME / S-GW has shown the configuration in which the QCI assignment is performed using the QCI characteristic table shown in FIG. Instead of setting a dedicated QCI and priority for emergency data communication, a QCI characteristic table including other applications and emergency data communication may be used as an application to which a specific QCI is applied.

For example, as an application subject to application of QCI = 4 in the QCI characteristic table, not only a real-time game but also emergency data communication is added so that QCI can be used by a plurality of applications. Priority 3 is assigned, and the UE can perform emergency data communication with priority over normal data communication.

FIG. 8 shows a QCI characteristic table including real-time games and emergency data communication as applications to which QCI = 5 is applied.

FIG. 9 is a diagram illustrating a control procedure when the UE performs emergency data communication (emergency data transmission) in the LTE system according to the first modification of the first embodiment. As shown in FIG. 9, in a UE in an idle state, for example, an operation for transmitting emergency data is performed via the user interface 120 (FIG. 3), or a trigger that triggers emergency data transmission When this event occurs, the UE and the eNB execute the RRC connection establishment process S11. In the RRC connection establishment process S11, the UE transmits an RRC connection request with the cause being “Emergency” to the eNB.

Further, when the UE performs emergency data communication (emergency data is transmitted), in the PDN connection request processing S12, the UE performs PDN Connectivity Request with Req_type as Emergency, via the eNB, MME / S- When transmitting to the GW, the specific APN is included in the PDN Connectivity Request and transmitted.

Here, the APN included in the PDN Connectivity Request is specified for real-time game use and emergency data communication by a network operator (communication carrier) or the like. The MME / S-GW determines whether the APN included in the PDN Connectivity Request is compatible with emergency data communication. This determination is performed by the MME / S-GW using, for example, a table stored in the memory 230 (FIG. 3). If it is determined that the APN corresponds to emergency data communication or the like, for example, the QCI shown in FIG. In order to assign a bearer for emergency data communication or the like based on the characteristic table, the Dedicated Bearer establishment process S131 is executed, and the MME / S-GW is associated with the emergency data communication (application) (QCI). ).

That is, when the MME / S-GW executes the Dedicated Bearer establishment process S131 for establishing a bearer for emergency data communication or the like, the MCI / S-GW displays the QCI characteristic table shown in FIG. 8 in the Activate Dedicated EPS Bearer Request Request message. A value of QCI = 4 determined based on this is included and transmitted to the UE.

When QCI = 4, the priority is 3, so emergency data communication can be performed with priority over normal data communication, and the GBR is also set, so the transmission speed is guaranteed and the data can be used stably. Is possible.

As described above, in the emergency data communication, the emergency data communication is added to another existing application to which the QCI is assigned, instead of setting a dedicated QCI and priority for the emergency data communication. Therefore, the standardized QCI characteristic table can be handled without greatly changing, and the modification to the LTE system can be reduced.

(Modification 2)
In Embodiment 1 described above, when the UE performs emergency data communication, the MME / S-GW has shown the configuration in which the QCI is assigned using the QCI characteristic table shown in FIG. Instead of setting a dedicated QCI and priority for emergency data communication, it may be configured to camouflage to an application to which a high-priority QCI is assigned when executing emergency data communication.

For example, a procedure for setting up a bearer for a video call with QCI = 2 and a bearer for a real-time game with QCI = 4 is established between the UE and the MME / S-GW. In the case of the emergency data communication, QCI = 2 or QCI = 4 may be assigned even in the emergency data communication.

An example of this operation will be described with reference to FIG. FIG. 10 is a diagram illustrating a control procedure when the UE transmits emergency data in the LTE system according to the second modification of the first embodiment. As shown in FIG. 10, in the UE in the idle state, when an operation for emergency data transmission is performed through the user interface 120 (FIG. 3), for example, the UE and the eNB perform RRC connection establishment processing. S11 is executed. In the RRC connection establishment process S11, the UE transmits an RRC connection request with the cause being “Emergency” to the eNB.

Further, when the UE performs emergency data communication (emergency data is transmitted), in the PDN connection request processing S12, the UE performs PDN Connectivity Request with Req_type as Emergency, via the eNB through the MME / S. -When transmitting to the GW, include the specific APN in the PDN Connectivity Request.

The APN transmitted here is specified for a real-time game by a network operator or the like. The MME / S-GW determines whether or not the APN included in the PDN Connectivity Request corresponds to the real-time game. This determination is performed by the MME / S-GW using, for example, a table stored in the memory 230 (FIG. 3). If it is determined that the APN corresponds to the real-time game, for example, the QCI characteristic table shown in FIG. Based on the above, a Dedicated Bearer establishment process S132 for establishing a bearer for a real-time game is executed, and the MME / S-GW assigns a bearer (QCI) associated with the real-time game (application).

That is, when executing the Dedicated Bearer establishment process S132 for establishing a bearer for a real-time game, the MME / S-GW is based on the QCI characteristic table shown in FIG. 5 in the Activate Dedicated EPS Bearer Context Request message. The determined value of QCI = 4 is included and transmitted to the UE.

As described above, emergency data communication is standardized because it does not set a dedicated QCI or priority for emergency data communication, but camouflages the application to which a high-priority QCI is assigned. QCI characteristic tables can be used, and fewer modifications are made to the LTE system.

In the first embodiment and its

modifications

1 and 2 described above, the description has been made on the assumption that they are applied to VoLTE. However, the first embodiment and its

modifications

1 and 2 are limited to application to VoLTE. However, the present invention is applicable to any LTE system.

(Embodiment 2)
In Embodiment 1 demonstrated above, the case where emergency data transmission was transmitted from UE in the LTE system was demonstrated. However, since the emergency data transmission is frequently used, there is a possibility that the speed of the truly urgent data communication may be delayed. Therefore, the execution of the emergency data communication may be limited. . Hereinafter, as Embodiment 2, a configuration in which execution of emergency data communication is restricted will be described.

FIG. 11 is a diagram illustrating a control procedure when the UE transmits an emergency call in the LTE system according to the second embodiment. In FIG. 11, the eNB and the MME / S-GW are collectively described as a network device (NW).

As shown in FIG. 11, in the UE in the idle state, when an operation for emergency call transmission is performed via the user interface 120 (FIG. 3), for example, the UE and the eNB perform RRC Connection establishment process S21. Execute. In the RRC connection establishment process S11, the UE transmits an RRC connection request with the cause being “Emergency” to the eNB.

In the RRC connection establishment process S21, there is an RRC connection setup transmission from the eNB to the UE and an RRC connection setup complete transmission from the UE to the eNB, but the illustration is omitted. Further, although a default bearer establishment process for establishing a voice bearer is executed following RRC Connection, illustration is omitted.

After the default bearer establishment process for establishing a voice bearer enables data exchange between the UE and the MME / S-GW, the UE sets Req_type to Emergency in the first PDN connection request process S22. PDN Connectivity Request is transmitted to MME / S-GW via eNB.

Upon receiving the PDN Connectivity Request, the MME / S-GW executes a Default Bearer establishment process S23 for establishing a bearer for IMS signaling (control signal) related to an emergency call, and sends an Activate Default EPS Bearer Quest Request Queue Request Quest Request Queue Request Queue Request Message Include value and send to UE. Here, based on the standardized QCI characteristic table shown in FIG. 5, QCI = 5 corresponding to IMS signaling for managing voice communication is assigned.

In the default bearer establishment process S23 for establishing a bearer for IMS signaling related to an emergency call, the MME / S-GW sends an E-RAB Setup Request to the eNB, and the eNB sends an RRC Connection Reconfiguration to the UE. Also included is a procedure in which the UE transmits an RRC Connection Reconfiguration Complete to the eNB, and the eNB transmits an E-RAB Setup Response to the MME / S-GW, but illustration is omitted.

Next, the MME / S-GW executes a dedicated bearer establishment process S24 for establishing a bearer for voice data related to the emergency call, and includes the QCI value in the Activate Dedicated EPS Bearer Request Request message to the UE. Send. Here, QCI = 1 corresponding to VoIP is assigned based on the standardized QCI characteristic table shown in FIG.

In the Dedicated Bearer establishment process S24 for establishing a bearer for voice data related to an emergency call, the MME / S-GW sends an E-RAB Setup Request to the eNB, and the eNB sends an RRC Connection Reconfiguration to the UE. Also included is a procedure in which the UE transmits an RRC Connection Reconfiguration Complete to the eNB, and the eNB transmits an E-RAB Setup Response to the MME, which is not shown. Voice communication by VoLTE is started through the above procedure.

As described above, for example, when calling the police, if the UE needs to execute emergency data communication (emergency data transmission), for example, when a traffic accident occurs, call the police. In the second PDN connection request processing S25, the UE sends a PDN Connectivity Request with Req_type as Emergency in the second PDN connection request processing S25 via the eNB via the MME / S-GW. When transmitting to the PDN, a specific APN is included in the PDN Connectivity Request and transmitted. Note that the UE may determine that it is necessary to execute the emergency data communication described above (transmission of emergency data) when making a call to the police, that is, call the police. When making a call, it may be automatically determined that emergency data communication (emergency data transmission) is necessary.

Here, the APN included in the PDN Connectivity Request is, for example, the APN specified for emergency data communication by the network operator or the like described in the first embodiment, or the first modification of the first embodiment. The APN specified for the real-time game and emergency data communication, for example, by the network operator described in the above, or the APN specified for the real-time game, for example, by the network operator described in the second modification of the first embodiment It is.

After that, when the MME / S-GW executes the Dedicated Bearer establishment process S26 for establishing the bearer for emergency data communication, the MME / S-GW displays the Activate Dedicated EPS Bearer Context Request message in FIG. 5, FIG. 7 and FIG. By including the QCI value (X) determined based on any of the shown QCI characteristic tables and transmitting it to the UE, at least emergency data communication can be performed with higher priority than normal data communication. , GBR is also set, so that the transmission speed is guaranteed and it can be used stably.

As described above, in the LTE system according to the second embodiment, emergency data communication with high priority is performed unless the first PDN connection request processing such as a telephone call to the police is performed. Therefore, harmful effects caused by frequent use of emergency calls can be suppressed.

(Modification)
In the second embodiment described above, after performing the first PDN connection request process for establishing the bearer for emergency call, the second PDN connection request process for establishing the bearer for emergency data communication is performed. By doing so, a configuration has been shown in which emergency data communication can be performed with a high QoS such as a high priority. However, when an emergency call is made, an emergency data communication is also requested so that a single PDN connection request process is performed. You may enable it to perform emergency data communication.

FIG. 12 is a diagram illustrating a control procedure when an emergency call is transmitted from the UE in the LTE system according to the modification of the second embodiment.

As shown in FIG. 12, in the UE in the idle state, for example, when an operation for emergency call transmission is performed via the user interface 120 (FIG. 3), the UE and the eNB perform RRC Connection establishment processing S31. Execute. In the RRC connection establishment process S11, the UE transmits an RRC connection request with the cause being “Emergency” to the eNB.

In the RRC connection establishment process S31, there is a transmission of the RRC connection setup from the eNB to the UE and a transmission of the RRC connection setup complete from the UE to the eNB, but the illustration is omitted. Further, although a default bearer establishment process for establishing a voice bearer is executed following RRC Connection, illustration is omitted.

After data exchange between the UE and the MME / S-GW is enabled by the default bearer establishment process for establishing a voice bearer, the PDN connection request process S32 causes the UE to use the PDN Connectivity Request with Req_type as Emergency. Is transmitted to the MME / S-GW via the eNB, the specific APN is included in the PDN Connectivity Request and transmitted. This APN is the APN described in the first embodiment or the first modification or the second modification thereof, and a duplicate description is omitted.

Upon receiving the PDN Connectivity Request, the MME / S-GW executes the Default Bearer establishment process S33 for establishing the bearer for IMS signaling related to the emergency call, and includes the Activate Default EPS Bearer Context Request message value in the Request Queue Request Quest message value. To the UE. Here, based on the standardized QCI characteristic table shown in FIG. 5, QCI = 5 corresponding to IMS signaling for managing voice communication is assigned.

In the default bearer establishment process S33 for establishing a bearer for IMS signaling related to an emergency call, the MME / S-GW sends an E-RAB Setup Request to the eNB, and the eNB sends an RRC Connection Reconfiguration to the UE. Also included is a procedure in which the UE transmits an RRC Connection Reconfiguration Complete to the eNB, and the eNB transmits an E-RAB Setup Response to the MME / S-GW, but illustration is omitted.

Next, the MME / S-GW executes a dedicated bearer establishment process S34 for establishing a bearer for voice data related to an emergency call, and includes the QCI value in the Activate Dedicated EPS Bearer Context Request message to the UE. Send. Here, QCI = 1 corresponding to VoIP is assigned based on the QCI characteristic table shown in FIG.

In the Dedicated Bearer establishment process S34 for establishing a bearer for voice data related to an emergency call, the MME / S-GW transmits an E-RAB Setup Request to the eNB, and the eNB transmits an RRC Connection Reconfiguration to the UE. Also included is a procedure in which the UE transmits an RRC Connection Reconfiguration Complete to the eNB, and the eNB transmits an E-RAB Setup Response to the MME, which is not shown. Voice communication by VoLTE is started through the above procedure.

After that, when the MME / S-GW executes the Dedicated Bearer establishment process S35 for establishing the bearer for emergency data communication, the MME / S-GW adds the Activate Dedicated EPS Bearer Context Request message to FIG. 5, FIG. 7 and FIG. By including the QCI value (X) determined based on any of the shown QCI characteristic tables and transmitting it to the UE, at least emergency data communication can be performed with higher priority than normal data communication. , GBR is also set, so that the transmission speed is guaranteed and it can be used stably.

As described above, in the LTE system according to the modification of the second embodiment, for example, emergency data communication is requested together with a call to the police. For example, when a UE is a radio communication terminal, when a traffic accident occurs , It is more convenient for users if not only to call the police, but also to send emergency site data and data in a single PDN connection request process when they want to send pictures and videos of accidents taken with wireless communication terminals. System.

It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

Claims

A network device is requested to execute emergency data communication, and a quality of service class identifier (QCI) corresponding to the emergency data communication transmitted from the network device in response to the request is received. A wireless communication terminal comprising a control unit that performs a process of performing the emergency data communication via the network device based on an identifier.
The service quality class identifier corresponding to the emergency data communication is:
The wireless communication terminal according to claim 1, wherein the wireless communication terminal is a service quality class identifier dedicated to the emergency data communication.
The quality of service class identifier dedicated to the emergency data communication is:
The wireless communication terminal according to claim 2, wherein the wireless communication terminal is assigned based on a QCI characteristic table including a quality of service class identifier dedicated to the emergency data communication stored in a memory of the network device.
The service quality class identifier corresponding to the emergency data communication is:
The wireless communication terminal according to claim 1, wherein the wireless communication terminal is a service quality class identifier shared with another application.
The service quality class identifier that is also used for the other application is:
The wireless communication terminal according to claim 4, wherein the wireless communication terminal is assigned to an application to which the service quality class identifier is applied, based on a QCI characteristic table including the other application and the emergency data communication, which is stored in a memory of the network device. .
The wireless communication terminal according to claim 1, wherein at least a higher priority than normal data communication is assigned to the service quality class identifier corresponding to the emergency data communication.
The controller is
The wireless communication terminal according to claim 1, wherein processing for requesting execution of emergency data communication with respect to the network device is performed when an emergency call is transmitted.
The controller is
2. The wireless communication according to claim 1, wherein when the network device is requested to execute the emergency data communication, a process of transmitting a PDN Connectivity Request corresponding to the emergency data communication to the network device is performed. Terminal.
The wireless communication terminal according to claim 8, wherein the PDN connectivity request corresponding to the emergency data communication is a PDN connectivity request including a specific access point name (APN) corresponding to the emergency data communication.
The controller is
The wireless communication terminal according to claim 7, wherein when an emergency call is transmitted, a process of transmitting a PDN Connectivity Request corresponding to the emergency call and thereafter transmitting a PDN Connectivity Request corresponding to the emergency data communication is performed.
The controller is
The wireless communication terminal according to claim 7, wherein when an emergency call is transmitted, a process of transmitting a PDN Connectivity Request corresponding to the emergency call and corresponding to the emergency data communication is performed.
When executing emergency data communication, the network device is requested to execute another application corresponding to the emergency data communication, and the other application transmitted from the network device in response to the request is sent to the network device. A wireless communication terminal comprising a control unit that receives a corresponding service quality class identifier (QCI) and performs processing for performing the emergency data communication via the network device based on the service quality class identifier.
(A) a step in which the wireless communication terminal requests the network device to perform emergency data communication;
(B) the network device transmitting a quality of service class identifier (QCI) corresponding to the emergency data communication to the wireless communication terminal;
(C) when the wireless communication terminal receives the quality of service class identifier (QCI), performs the emergency data communication via the network device based on the quality of service class identifier. Control method.
Upon receiving a request for execution of emergency data communication from a wireless communication terminal, a service quality class identifier used when the wireless communication terminal performs the emergency data communication corresponding to the emergency data communication in response to the request A network apparatus provided with the control part which performs the process which transmits (QCI) to the said radio | wireless communication terminal.