JP6350520B2 - Cellular communication system, mobile station, control node, base station, and method related thereto - Google Patents

Description

  The present invention relates to a cellular communication system for broadcasting a message to a plurality of mobile stations in a cell.

  In the field of cellular communication networks, systems are known that broadcast messages to a plurality of mobile stations that are camping on a cell. For example, the 3rd Generation Partnership Project (3GPP) defines Cell Broadcast Service (CBS) (see Non-Patent Document 1). The main use of CBS is to deliver important warning messages to mobile stations. 3GPP defines a Public Warning System (PWS) that distributes important warning messages to mobile stations using CBS (see Non-Patent Document 2). 3GPP Release 11 is used as PWS for the Earthquake and Tsunami Warning System (ETWS) used in Japan, the Commercial Mobile Alert System (CMAS) used in North America, the Korean Public Alert System (KPAS) used in Korea, and European countries Standardized EU-ALERT. Note that KPAS and EU-ALERT are minor variations of CMAS, and KPAS and EU-ALERT alarm messages are delivered to mobile stations in the same manner as CMAS. Therefore, explicit reference to KPAS and EU-ALERT will be omitted below, but the description regarding CMAS below applies to KPAS and EU-ALERT as well.

  The mobile station can receive PWS notification (that is, ETWS notification and CMAS notification) when connected to the Home Public Land Mobile Network (HPLMN) in order to receive normal service (see Non-Patent Documents 1 and 2). reference). Further, the mobile station can receive the PWS notification even when roaming, that is, when connected to the Visited PLMN (VPLM) to receive normal service (see Non-Patent Documents 1 and 2). .

  Furthermore, a mobile station that supports ETWS or CMAS can receive ETWS notification or CMAS notification in the limited service state (see Non-Patent Documents 2 and 3). Here, limited service means emergency call, ETWS and CMAS. A mobile station is responsible for PLMN identity if the Universal Subscriber Identification Module (USIM) is not implemented, if it cannot find a suitable public land mobile network (PLMN) cell, or if location registration fails. First, camp on the acceptable cell and enter the limited service state. A mobile station in a limited service state can initiate an emergency call, receive an ETWS notification, and receive a CMAS.

  The alarm message delivery procedure in Universal Mobile Telecommunications System (UMTS) and Evolved Packet System (EPS) is defined in Non-Patent Document 1. FIG. 16 shows the configuration of a distribution network for alarm messages (specifically, CBS messages) in UMTS and EPS. FIG. 17 is a sequence diagram showing an alarm message delivery procedure in UMTS. FIG. 18 is a sequence diagram showing an alarm message delivery procedure in EPS, that is, Long Term Evolution (LTE).

  The Cell Broadcast Entity (CBE) described in FIGS. 16 to 18 is a device or system that makes a transmission request for an alarm message. For example, a server of the Japan Meteorological Agency that transmits earthquake early warnings corresponds to CBE. The Cell Broadcast Center (CBC) receives an alarm message transmission request from the CBE, determines an alarm message distribution area, and determines the contents of the alarm message. The distribution area is based on information for specifying the target area included in the transmission request from the CBE, based on the sector unit, cell unit, location registration area (eg routing area, tracking area) unit, or communication carrier It is determined in any other area unit to be defined.

  In the case of UMTS, CBC has an interface with Radio Network Controller (RNC) or Serving GPRS Support Node (SGSN). In the example of FIGS. 16 and 17, the CBC is connected to the RNC. The CBC sends a Write-Replace message to the RNC. The Write-Replace message includes the content of the alarm message to be distributed to the mobile station and the designation of the distribution area. Based on the Write-Replace message, the RNC determines a base station (that is, NodeB) to which the alarm message is to be distributed, and requests the target base station (NodeB) to broadcast the alarm message. Then, the base station (NodeB) transmits broadcast information including an alarm message using downlink channels received by a plurality of mobile stations located in its own cell.

  In the case of UMTS, the alert message is broadcast using Common Traffic Channel (CTTH), which is a downlink logical channel. CTTH is mapped to a Forward Access Channel (FACH) that is a transport channel and is transmitted on a Secondary Common Control Physical Channel (S-CCPCH) that is a physical channel. The base station (NodeB) transmits CTTH Indicator indicating CTTH transmission as broadcast information. Specifically, CTTH Indicator is transmitted as one of system information (that is, System Information Block Type 5 (SIB5)) in Primary Common Control Physical Channel (P-CCPCH) and Broadcast Control Channel (BCCH). Further, the base station (NodeB) transmits a paging message indicating that the system information (BCCH) is changed on the S-CCPCH, thereby prompting the mobile station in a standby state to receive the system information.

  The above-described transmission using CTTH in UMTS is used for transmission of ETWS Secondary Notification and CMAS notification. On the other hand, the ETWS Primary Notification is transmitted using a paging message indicating that there is a change in system information.

  The mobile station of UMTS can receive ETWS Primary Notification, ETWS Secondary Notification, and CMAS notification when in a standby state (CELL_PCH state, URA_PCH state). Also, a UMTS mobile station can receive an ETWS Primary Notification when in a communication state (CELL_DCH state). Further, even in the limited service state, the UMTS mobile station can receive the ETWS Secondary Notification and the CMAS notification by receiving the system information.

  Distribution of the alarm message in the EPS shown in FIG. 18 is also performed with an architecture substantially similar to that of the UMTS described above. However, in EPS, the CBC is connected to the mobility management entity (MME), and the alarm message is supplied to the base station (eNodeB) via the MME. The base station (eNodeB) transmits an ETWS Indication bit indicating that the alarm message is delivered using the paging message. The paging message is mapped to the Paging Channel (PCH) and transmitted on the Physical Downlink Shared Channel (PDSCH). Then, the base station (eNodeB) transmits system information (System Information Block (SIB)) including an alarm message. ETWS Primary Notification is transmitted in SIB Type 10 (SIB10), and ETWS Secondary Notification is transmitted in SIB Type 11 (SIB11). CMAS Notification is transmitted in SIB Type 12 (SIB12). The base station (eNodeB) broadcasts system information including an alarm message in the cell using the Broadcast Control Channel (BCCH) / Downlink Shared Channel (DL-SCH) / Physical Downlink Shared Channel (PDSCH).

  An EPS mobile station attempts to receive a paging message at least once in the Default Paging Cycle, regardless of whether it is in a standby state (RRC_IDLE state) or a communication state (RRC_CONNECTED state). Then, in response to receiving the paging message in which the ETWS Indication bit is set, the mobile station starts receiving system information (SIB) including an alarm message. Therefore, an EPS mobile station can perform ETWS Primary Notification, ETWS Secondary Notification, and CMAS notification in any of a standby state (RRC_IDLE state) and a communication state (RRC_CONNECTED state). Further, even when the EPS mobile station is in the limited service state, it can receive ETWS Primary Notification, ETWS Secondary Notification, and CMAS notification by receiving system information.

3GPP TS 23.041 V11.5.0 (2012-12) “3rd Generation Partnership Project; Technical Specification Group Core Network and Terminals; Technical realization of Cell Broadcast Service (CBS) (Release 11)”, December 2012 3GPP TS 22.268 V11.5.0 (2012-12) “3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; Public Warning System (PWS) requirements (Release 11)”, December 2012 3GPP TS 36.304 V11.2.0 (2012-12) “3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE) procedures in idle mode (Release 11)”, December 2012

  As can be seen from the above, when a mobile station supporting ETWS or CMAS is connected to HPLMN (or Equivalent HPLMN (EHPLMN)) to receive normal service, the Visitor PLMN to receive normal service. PWS notification (ie ETWS notification and CMAS notification) whether connected to (VPLMN) (when roaming) or connected to any acceptable cell in limited service state Can be received. This is because the current PWS is intended to deliver highly important information (for example, tsunami and earthquake information), so as many mobile stations as possible located in the target area will receive PWS notification. It is based on the idea that it should be received.

  The inventors of this case examined the expansion of the application of PWS notification. As a result, the inventors of the present case indicate that there are cases where it is preferable to discard the PWS notification without notifying the user in a mobile station that does not need to receive the PWS notification when the use of the PWS notification is expanded. I found it. An example of such a case is when a relatively less important message is broadcast as a PWS notification compared to earthquake and tsunami information.

  Non-Patent Document 1 describes that a warning message (CBS message) broadcast in the CBS architecture is identified by a Message Identifier. Furthermore, Non-Patent Document 1 discards a CBS message to which a message identifier in a PLMN operator specific range (ie, A000 hex to AFFF hex) is assigned, unless the mobile station receives it from HPLMN (or Equivalent HPLMN). It stipulates that it should be. However, Non-Patent Document 1 describes whether a mobile station discards a CBS message (that is, a CBS message including a PWS notification) to which a message identifier indicating PWS is assigned (for example, the mobile station has limited service). It is not described that the state is different based on whether the mobile station is in the state or whether the mobile station receives the PWS notification from the HPLMN.

  Accordingly, one of the objects of the present invention is to provide a cellular communication system, a mobile station, a control node, and a base station for enabling the PWS notification to be discarded in a mobile station that does not need to receive the PWS notification, and to these It is to provide a method and program.

  In the first aspect, the cellular communication system includes a control node, a base station, and a mobile station. The control node is configured to transmit a request message for requesting broadcast of Public Warning System (PWS) notification. The base station is configured to receive the request message from the control node and broadcast broadcast information including the PWS notification in a cell. The mobile station is configured to receive the broadcast information. Here, each of the request message and the broadcast information includes (a) a first information element indicating whether or not the PWS notification should be discarded in the mobile station when the mobile station is in a limited service state, and (B) at least a second information element indicating whether or not the mobile station should discard the PWS notification when the mobile station has not received the PWS notification from a Home Public Land Mobile Network (HPLMN) Including one.

  In the second aspect, the mobile station has a radio communication unit and a control unit. The wireless communication unit is configured to receive broadcast information broadcast in a cell. The control unit is configured to control the operation of the mobile station based on Public Warning System (PWS) notification included in the broadcast information. Here, the broadcast information includes (a) a first information element indicating whether or not the PWS notification should be discarded in the mobile station when the mobile station is in a limited service state, and (b) the mobile station. Includes at least one of second information elements indicating whether the mobile station should discard the PWS notification when the PWS notification is not received from a Home Public Land Mobile Network (HPLMN). Then, the control unit determines whether to discard the PWS notification according to the first or second information element.

  In the third aspect, the control node includes a control unit configured to transmit the request message to the base station. The request message causes the base station to broadcast broadcast information including a Public Warning System (PWS) notification to the mobile station. The request message further includes: (a) a first information element indicating whether or not the PWS notification should be discarded in the mobile station when the mobile station is in a limited service state; and (b) the mobile station It includes at least one of second information elements indicating whether the mobile station should discard the PWS notification when the PWS notification is not received from a Home Public Land Mobile Network (HPLMN).

  In the fourth aspect, the base station has a transmission unit configured to broadcast broadcast information including Public Warning System (PWS) notification to the mobile station in the cell. Here, the broadcast information includes (a) a first information element indicating whether or not the PWS notification should be discarded in the mobile station when the mobile station is in a limited service state, and (b) the mobile station. Includes at least one of second information elements indicating whether the mobile station should discard the PWS notification when the PWS notification is not received from a Home Public Land Mobile Network (HPLMN).

  In a fifth aspect, a method performed in a mobile station receives broadcast information broadcast in a cell and controls the operation of the mobile station based on a Public Warning System (PWS) notification included in the broadcast information. Including. Here, the broadcast information includes (a) a first information element indicating whether or not the PWS notification should be discarded in the mobile station when the mobile station is in a limited service state, and (b) the mobile station. Includes at least one of second information elements indicating whether the mobile station should discard the PWS notification when the PWS notification is not received from a Home Public Land Mobile Network (HPLMN). The controlling includes determining whether to discard the PWS notification according to the first or second information element.

  In a sixth aspect, a method performed at a control node includes transmitting a request message to a base station. The request message causes the base station to broadcast broadcast information including a Public Warning System (PWS) notification to the mobile station. The request message further includes: (a) a first information element indicating whether or not the PWS notification should be discarded in the mobile station when the mobile station is in a limited service state; and (b) the mobile station It includes at least one of second information elements indicating whether the mobile station should discard the PWS notification when the PWS notification is not received from a Home Public Land Mobile Network (HPLMN).

  In a seventh aspect, a method performed in a base station includes broadcasting broadcast information including Public Warning System (PWS) notification to a mobile station in a cell. Here, the broadcast information includes (a) a first information element indicating whether or not the PWS notification should be discarded in the mobile station when the mobile station is in a limited service state, and (b) the mobile station. Includes at least one of second information elements indicating whether the mobile station should discard the PWS notification when the PWS notification is not received from a Home Public Land Mobile Network (HPLMN).

  In the eighth aspect, the program includes a group of instructions for causing a computer to perform a control method related to the mobile station. The control method includes controlling the operation of the mobile station based on Public Warning System (PWS) notification included in broadcast information broadcast in a cell. Here, the broadcast information includes (a) a first information element indicating whether or not the PWS notification should be discarded in the mobile station when the mobile station is in a limited service state, and (b) the mobile station. Includes at least one of second information elements indicating whether the mobile station should discard the PWS notification when the PWS notification is not received from a Home Public Land Mobile Network (HPLMN). The controlling includes determining whether to discard the PWS notification according to the first or second information element.

  In the ninth aspect, the program includes a group of instructions for causing the computer to perform a control method related to the control node. The control method includes controlling the control node to transmit a request message to a base station. The request message causes the base station to broadcast broadcast information including a Public Warning System (PWS) notification to the mobile station. The request message further includes: (a) a first information element indicating whether or not the PWS notification should be discarded in the mobile station when the mobile station is in a limited service state; and (b) the mobile station It includes at least one of second information elements indicating whether the mobile station should discard the PWS notification when the PWS notification is not received from a Home Public Land Mobile Network (HPLMN).

  In a tenth aspect, a program includes a group of instructions for causing a computer to perform a control method related to a base station. The control method includes controlling the base station to broadcast broadcast information including Public Warning System (PWS) notification to a mobile station in a cell. Here, the broadcast information includes (a) a first information element indicating whether or not the PWS notification should be discarded in the mobile station when the mobile station is in a limited service state, and (b) the mobile station. Includes at least one of second information elements indicating whether the mobile station should discard the PWS notification when the PWS notification is not received from a Home Public Land Mobile Network (HPLMN).

  According to the above-described aspect, there is provided a cellular communication system, a mobile station, a control node, and a base station, and a method and a program related thereto for enabling a PWS notification to be discarded in a mobile station that does not need to receive the PWS notification Can be provided.

It is a block diagram which shows the structural example of the cellular communication system which concerns on 1st Embodiment. It is a sequence diagram which shows the transmission request | requirement procedure of the alert message from the broadcast node which concerns on 1st Embodiment to a control node. It is a sequence diagram which shows the transmission request | requirement procedure of the alarm message from the control node which concerns on 1st Embodiment to a base station. It is a sequence diagram which shows the transmission procedure of the alert message from the base station which concerns on 1st Embodiment to a mobile station. It is a block diagram which shows the structural example of the control node which concerns on 1st Embodiment (in the case of EPS). It is a block diagram which shows the structural example of the control node which concerns on 1st Embodiment (in the case of UMTS). It is a block diagram which shows the structural example of the base station which concerns on 1st Embodiment (in the case of EPS). It is a block diagram which shows the structural example of the mobile station which concerns on 1st Embodiment. It is a figure which shows the 1st example of the message structure containing UE Behavior indication which concerns on 1st Embodiment. It is a figure which shows the 2nd example of the message structure containing UE Behavior indication which concerns on 1st Embodiment. It is a figure which shows the 3rd example of the message structure containing UE Behavior indication which concerns on 1st Embodiment. It is a figure which shows the 1st example of UE Behavior indication which concerns on 1st Embodiment. It is a figure which shows the 2nd example of UE Behavior indication which concerns on 1st Embodiment. It is a figure which shows the specific example of Warning Type Value which concerns on 2nd Embodiment. It is a figure which shows the specific example of UE Behavior indication which concerns on other embodiment. It is a figure which shows the structure of the delivery network of the alarm message in UMTS and EPS concerning a background art. It is a sequence diagram which shows the delivery procedure of the alarm message which concerns on background art (in the case of UMTS). It is a sequence diagram which shows the delivery procedure of the alarm message which concerns on background art (in the case of EPS).

  Hereinafter, specific embodiments will be described in detail with reference to the drawings. In each drawing, the same or corresponding elements are denoted by the same reference numerals, and redundant description is omitted as necessary for clarification of the description.

<First Embodiment>
FIG. 1 is a block diagram illustrating a configuration example of a cellular communication system 1 according to the present embodiment. In the present embodiment and other embodiments described later, the case where the cellular communication system 1 is a 3GPP UMTS or EPS will be described.

  The cellular communication system 1 includes a cellular communication network 10 configured to be able to broadcast a plurality of mobile stations (User Equipment (UE)) 400 and PWS notification (that is, ETWS notification and CMAS notification) as an alarm message. The cellular communication network 10 includes a broadcast node 100, a control node 200, and a base station 300 as nodes relating to the broadcast of PWS notification. The PWS notification broadcast by the cellular communication network 10 may be performed in the same manner as the broadcast using the CBS architecture described in the background art. Hereinafter, the PWS notification broadcast in the cellular communication system 1 according to the present embodiment will be described.

  The broadcast node 100 corresponds to the Cell Broadcast Center (CBC), determines the distribution area of the alarm message (that is, PWS notification), and determines the content of the PWS notification. The control node 200 is a node having an interface with the broadcast node 100. In the case of EPS, the mobility management entity (MME) corresponds to the control node 200, and in the case of UMTS, the radio network controller (RNC) corresponds to the control node 200. The control node 200 receives a PWS notification distribution request (that is, a UMTS Write-Replace message or an EPS Write-Replace-Warning-Request message) from the broadcast node 100. This distribution request includes the contents of the PWS notification to be broadcast and the designation of the distribution area. The control node 200 determines the base station 300 to which the PWS notification is to be distributed, and requests the target base station 300 to broadcast the PWS notification.

  The base station 300 manages the cell 310 and can perform bidirectional wireless communication with the mobile station 400 using an uplink channel and a downlink channel. In the case of EPS, eNodeB corresponds to the base station 300, and in the case of UMTS, NodeB corresponds to the base station 300. The base station 300 receives a PWS notification delivery request (that is, a UMTS Broadcast Request message or an EPS Write-Replace-Warning-Request message) from the control node 200. Then, in response to receiving the PWS notification distribution request, the base station 300 broadcasts broadcast information including the PWS notification in the cell 310 so that the plurality of mobile stations 400 can receive the broadcast information. As described above, in the case of UMTS, the PWS notification is transmitted using, for example, CTTH (or CTTH and a paging signal). In the case of EPS, the PWS notification is transmitted, for example, included in the system information.

  The mobile station (UE) 400 receives broadcast information including PWS notification in the cell 310. The mobile station 400 may perform a warning operation for the user, for example, output of a warning sound or pop-up display, or both in response to receiving the warning message.

Furthermore, in the present embodiment, a PWS notification delivery request sent from the broadcast node 100 to the control node 200, a PWS notification delivery request sent from the control node 200 to the base station 300, and broadcast information sent from the base station 300. Each includes a UE Behavior Indication. UE Behavior Indication includes at least one of the following first and second information elements;
(A) a first information element indicating whether or not the mobile station 400 should discard the PWS notification when the mobile station 400 is in a limited service state;
(B) A second information element indicating whether or not the mobile station 400 should discard the PWS notification when the mobile station 400 has not received the PWS notification from the HPLMN (or EHPLMN).

  Note that the limited service state is a state in which the mobile station 400 is camping on an acceptable cell in order to receive a limited service (that is, an emergency call, ETWS, and CMAS) as described above. . That is, in the limited service state, the mobile station 400 is not connected to HPLMN, EHPLMN, or VPLMN. If the mobile station 400 cannot find an appropriate cell of HPLMN, EHPLMN, or VPLMN, if USIM is not implemented, or if location registration fails, it camps on an acceptable cell regardless of the PLMN identity, Limited Transition to service state.

  When the mobile station 400 receives a PWS notification while in the limited service state, the mobile station 400 may determine whether to discard the PWS notification according to the UE Behavior Indication (that is, the first information element). Further, when receiving a PWS notification from another PLMN different from HPLMN (or EHPLMN), the mobile station 400 determines whether to discard the PWS notification according to UE Behavior Indication (that is, the second information element). do it. That is, according to the present embodiment, whether or not the PWS notification is discarded in the mobile station 400 can be controlled from the cellular communication network 10 side.

  Discarding the PWS notification in accordance with the first or second information element described above means that the mobile station 400 does not present the PWS notification to the user. Thus, for example, if the PWS notification is broadcast in the cell 310 with the first information element, the cellular communication network 10 directly controls whether or not to present the PWS notification to the user at the mobile station 400 in the limited service state. can do. That is, the cellular communication network 10 can prevent the PWS notification from being presented to the user in the mobile station 400 in the limited service state, as necessary. In other words, the cellular communication network 10 presents the PWS notification to the user only in the mobile station 400 (that is, the mobile station 400 in the normal service state) appropriately connected to the HPLMN, EHPLMN, or VPLMN as necessary. You can make it.

  Also, when the PWS notification is broadcast in the cell 310 with the second information element, the cellular communication network 10 presents the PWS notification to the user at the mobile station 400 that is not connected to the HPLMN (or similar EHPLMN). It is possible to directly control whether or not. That is, the cellular communication network 10 can prevent the PWS notification from being presented to the user in the mobile station 400 that is not connected to the HPLMN (or EHPLMN), as necessary. In other words, the cellular communication network 10 can ensure that the PWS notification is presented to the user only at the mobile station 400 that is properly connected to the HPLMN (or EHPLMN) as needed.

  Next, the configuration and operation of the broadcast node 100, the control node 200, the base station 300, and the mobile station 400 will be described in detail below. FIG. 2 is a sequence diagram showing a PWS notification transmission request procedure from the broadcast node (CBC) 100 to the control node (MME) 200. FIG. 3 is a sequence diagram showing a PWS notification transmission request procedure from the control node (MME) 200 to the base station (eNB) 300. FIG. 4 is a sequence diagram showing a procedure for transmitting a PWS notification from the base station (eNB) 300 to the mobile station (UE) 400. 2 to 4 show a case where the cellular communication system 1 is EPS.

  In the example of FIG. 2, the broadcast node 100 transmits a Write-Replace Warning Request message to the control node 200 (step S11). Here, the Write-Replace Warning Request message includes a PWS notification and a UE Behavior Indication parameter. The PWS notification parameter indicates the content of the PWS notification. The UE Behavior Indication parameter includes the first information element and / or the second information element described above, and indicates the content of the UE Behavior Indication.

  In the example of FIG. 3, the control node 200 transfers a Write-Replace Warning Request message to the base station 300 (step S21). The Write-Replace Warning Request message includes a PWS notification parameter and a UE Behavior Indication parameter.

  In the example of FIG. 4, the base station 300 broadcasts broadcast information in the cell 310, and the mobile station 400 receives the broadcast information (step S31). The broadcast information includes a PWS notification parameter and a UE Behavior Indication parameter. The mobile station 400 determines whether to discard the PWS notification according to the UE Behavior Indication (step S32).

  Next, configuration examples of the control node 200, the base station 300, and the mobile station 400 will be described with reference to FIGS. 5 to 8 show only main components related to the description of transmission of the PWS notification.

  FIG. 5 is a block diagram illustrating a configuration example when the control node 200 is an MME. The PWS request unit 201 receives a PWS notification distribution request (that is, a Write-Replace Warning Request message) from the broadcast node (CBC) 100, determines a base station (eNodeB) 300 to which the PWS notification is to be broadcast, A Write-Replace Warning Request message is transmitted to the base station (eNodeB) 300. In the present embodiment, the Write-Replace Warning Request message includes PWS notification and UE Behavior Indication.

  FIG. 6 is a block diagram illustrating a configuration example when the control node 200 is an RNC. The PWS request unit 211 receives a PWS notification distribution request (that is, a Write-Replace message) from the broadcast node (CBC) 100, determines a base station (NodeB) 300 to which the PWS notification is to be broadcast, and the target base station (NodeB) 300 sends a Broadcast Request message. In the present embodiment, the Broadcast Request message includes PWS notification and UE Behavior Indication.

  FIG. 7 is a block diagram illustrating a configuration example of the base station 300. FIG. 7 shows a case where the base station 300 is an eNodeB. The wireless communication unit 301 wirelessly transmits a downlink signal including a plurality of downlink channels, and receives an uplink signal including a plurality of uplink channels from the mobile station 400. The plurality of downlink channels include a broadcast channel (for example, CTTH or BCCH) used for transmission of broadcast information including PWS notification and UE Behavior Indication, a paging channel (for example, Paging Control Channel (PCCH)), and the like. The PWS transmission unit 302 receives the PWS notification distribution request (ie, Write-Replace Warning Request message) from the control node 200, and controls the wireless communication unit 301 to transmit broadcast information including the PWS notification.

  FIG. 8 is a block diagram illustrating a configuration example of the mobile station 400. The wireless communication unit 401 can receive a downlink signal including a plurality of downlink channels from the base station 300. Further, the radio communication unit 401 can transmit an uplink signal including a plurality of uplink channels to the base station 300. The wireless communication unit 401 receives broadcast information broadcast in the cell 310 from the base station 300 and supplies this to the PWS control unit 402.

  The PWS control unit 402 receives broadcast information including PWS notification and UE Behavior Indication, and controls the operation of the mobile station 400 according to the PWS notification and UE Behavior Indication. Specifically, the PWS control unit 402 determines whether to discard the PWS notification according to the above-described first or second information element included in the UE Behavior Indication. When the PWS notification is not discarded, the PWS control unit 402 may output a warning sound or a popup display according to the PWS notification, for example.

  Subsequently, several specific examples of the message structure including UE Behavior indication will be described below. The first example of FIG. 9 shows a message structure in which the UE Behavior indication parameter is defined as a parameter different from the PWS notification in the Write-Replace Warning Request message for EPS. The Write-Replace Warning Request message 60 in FIG. 9 includes a UE Behavior indication parameter 61, a Warning-Type parameter 62, and a Warning Message Content E-UTRAN 63. The UE Behavior indication parameter 61 includes at least one of the first and second information elements described above. Warning-Type parameter 62 and Warning Message Content E-UTRAN 63 correspond to PWS notification. Specifically, the Warning-Type parameter 62 is broadcast in the system information (SIB10) as an ETWS Primary Notification. Warning Message Content E-UTRAN 63 is broadcast in the system information (SIB11) as an ETWS Secondary notification.

  The second example of FIG. 10 shows a message structure in which the UE Behavior indication parameter is defined as a parameter different from the PWS notification in the Write-Replace message for UMTS. The Write-Replace message 70 in FIG. 10 includes a UE Behavior indication parameter 71, a Warning-Type parameter 72, and a CBS-Message-Information-Page 1 73. The UE behavior indication parameter 71 includes at least one of the first and second information elements described above. Warning-Type parameter 72 and CBS-Message-Information-Page 1 73 correspond to PWS notification. Specifically, the Warning-Type parameter 72 is transmitted as an ETWS Primary Notification in the paging channel. CBS-Message-Information-Page 1 73 is broadcast on CTTH as an ETWS Secondary notification.

  The third example of FIG. 11 shows a message structure in which the UE Behavior indication parameter is defined in the Warning Type parameter as the ETWS primary notification. In the example of FIG. 11, the Warning Type parameter 80 includes a Warning Type Value field 81 and a UE Behavior indication field 82. The Warning Type Value field 81 indicates a warning type (earthquake, tsunami, or earthquake and tsunami) related to ETWS notification. The UE Behavior indication field 82 includes at least one of the first and second information elements described above. In the example of FIG. 11, the UE Behavior indication field 82 is 1-bit information arranged in BIT 6 of the second octet (OCTET 2) of the Warning Type parameter 80, and any of the first and second information elements described above. Indicate.

  12 and 13 show specific examples of UE Behavior indication defined as 1-bit information. The 1-bit information in FIG. 12 corresponds to the first information element described above. That is, the 1-bit information in FIG. 12 is used to command the mobile station 400 to discard the PWS notification when in the limited service state. The 1-bit information in FIG. 13 corresponds to the second information element described above. That is, the 1-bit information in FIG. 13 is used to command the mobile station 400 to discard the PWS notification when the PWS notification is received from another HPLMN different from HPLM (or EHPLMN).

<Second Embodiment>
In the present embodiment, a modified example of the above-described first embodiment will be described. In the first embodiment, an example has been described in which the mobile station 400 determines to discard the PWS notification according to the UE Behavior indication regardless of the type of the PWS notification. However, only when the mobile station 400 is a specific PWS notification type, the mobile station 400 may refer to the UE behavior indication and determine whether to discard the PWS notification according to the UE behavior indication. Specifically, the mobile station 400 may be configured to present a PWS notification to a user without performing a discard determination based on UE Behavior indication for a highly important and urgent PWS notification type. . Thereby, the mobile station 400 can reduce the processing time required for determination based on UE Behavior indication, and can promptly present a highly important and urgent PWS notification to the user.

  Hereinafter, a case where the PWS notification is an ETWS notification will be described as an example. FIG. 14 is a diagram showing a specific example of the Warning Type Value included in the Warning Type parameter of ETWS. In the example of FIG. 14, a new value 91 representing commercial use is defined. For example, the mobile station 400 may perform the discard determination based on UE Behavior indication only when the Warning Type Value indicates commercial use. On the other hand, when the Warning Type Value indicates another existing value different from the commercial use, the mobile station 400 generates an alarm sound according to the emergency user alert indication and the popup indication without performing the discard determination based on the UE Behavior indication. Output, pop-up display, or both may be performed. Thereby, the mobile station 400 can promptly present a warning of earthquake information and tsunami information with high importance and urgency to the user.

<Other embodiment 1>
The first embodiment may be used to determine whether other types of broadcast messages (CBS messages) different from PWS notification are discarded at the mobile station 400. In 3GPP, the range of Message Identifier 4542-6399 (1100 hex-18FF hex) is defined for Public Warning System (PWS). The first embodiment may be used when broadcasting a CBS message whose Message Identifier is outside the range of 4542 to 6399 (1100 hex to 18FF hex). Thereby, the cellular communication network 10 directly controls whether the CBS message is discarded in the mobile station 400 in the limited service state with respect to various CBS messages that are not limited to the PWS notification from the cellular communication network 10 side. Can do. Further, the cellular communication network 10 determines whether or not the CBS message is discarded in the mobile station 400 not connected to the HPLMN (or similar EHPLMN) for various CBS messages not limited to the PWS notification. It can be controlled directly on the 10 side.

<Other embodiment 2>
The first embodiment may be used to determine whether other types of broadcast messages (CBS messages) different from PWS notification are discarded at the mobile station 400. In 3GPP, the range of Message Identifier 4542-6399 (1100 hex-18FF hex) is defined for Public Warning System (PWS). Furthermore, Message Identifiers 4352 to 4359 (1100 hex to 1107 hex) are defined exclusively for ETWS, and Message Identifiers 4370 to 4399 (1108 hex to 112F hex) are defined exclusively for CMAS, EU-Alert, and KPAS. In the first embodiment, when the mobile station 400 is in the limited service state, as a method for indicating whether or not the broadcast message should be discarded in the mobile station 400, it is conceivable to associate and control the message identifier. As an example, as shown in FIG. 15, Message Identifier 4357 (1105 hex) defined as “ETWS CBS Message Identifier for future extension” may be redefined as “ETWS CBS Message Identifier for commercial services”. If the mobile station 400 is in the limited service state and receives a broadcast message having the Message Identifier 4357 (1105 hex), it may be defined that the broadcast message is discarded uniformly.

  In the first and second embodiments, a specific example in which the cellular communication system 1 is UMTS or EPS is shown. However, the application destinations of the first and second embodiments are not limited to the UMTS and EPS cellular communication systems. That is, the first and second embodiments can be widely applied to cellular communication systems that distribute alarm messages by cell broadcast to a plurality of mobile stations.

  The processing of the broadcast node 100, the control node 200, the base station 300, and the mobile station 400 described in the first and second embodiments is performed by at least one processor (eg, microprocessor, MPU (Micro Processing Unit), DSP. (Digital Signal Processor)) may be realized by causing a computer system to execute the program. Specifically, one or a plurality of programs including an instruction group for causing a computer system to execute an algorithm described using a flowchart, a sequence diagram, and the like may be created, and the programs may be supplied to the computer.

  This program can be stored using various types of non-transitory computer readable media and supplied to a computer. Non-transitory computer readable media include various types of tangible storage media. Examples of non-transitory computer-readable media include magnetic recording media (for example, flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (for example, magneto-optical disks), CD-ROMs (Read Only Memory), CD-Rs, CD-R / W and semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (random access memory)) are included. The program may also be supplied to the computer by various types of transitory computer readable media. Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves. The temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.

  Furthermore, the above-described embodiment is merely an example relating to application of the technical idea obtained by the present inventors. That is, the technical idea is not limited to the above-described embodiment, and various changes can be made.

  The technical idea described in the above-described embodiment can be described as, for example, the following supplementary notes, but is not limited thereto.

(Appendix 1)
A control node configured to send a broadcast request including a broadcast message;
A base station configured to receive the broadcast request from the control node and broadcast broadcast information including the broadcast message in a cell;
A mobile station configured to receive the broadcast information;
With
The broadcast information includes an information element indicating whether or not the mobile station should discard the broadcast message when the mobile station is in a limited service state.
Cellular communication system.
(Appendix 2)
The cellular communication system according to supplementary note 1, wherein, when the mobile station receives the broadcast information while in the limited service state, the mobile station determines whether to discard the broadcast message according to the information element.
(Appendix 3)
The broadcast information includes 3GPP Cell Broadcast service (CBS) message,
The CBS message includes broadcast data corresponding to the broadcast message and the information element,
The information element is a specific value of a Message Identifier included in the CBS message.
The cellular communication system according to appendix 1 or 2.
(Appendix 4)
The cellular communication system according to appendix 3, wherein the specific value indicates that the broadcast message is for commercial use.
(Appendix 5)
A mobile station,
A wireless communication unit for receiving broadcast information broadcast in a cell;
A control unit for controlling the operation of the mobile station based on a broadcast message included in the broadcast information;
With
The broadcast information includes an information element indicating whether or not the mobile station should discard the broadcast message when the mobile station is in a limited service state.
Mobile station.
(Appendix 6)
The mobile station according to appendix 5, wherein, when the broadcast information is received while in the limited service state, the control unit determines whether to discard the broadcast message according to the information element.
(Appendix 7)
The broadcast information includes 3GPP Cell Broadcast service (CBS) message,
The CBS message includes broadcast data corresponding to the broadcast message and the information element,
The information element is a specific value of a Message Identifier included in the CBS message.
The mobile station according to appendix 5 or 6.
(Appendix 8)
The mobile station according to appendix 7, wherein the specific value indicates that the broadcast message is for commercial use.
(Appendix 9)
A transmitter for broadcasting so that a plurality of mobile stations can receive broadcast information including a broadcast message in a cell;
The broadcast information includes an information element indicating whether the broadcast message should be discarded in the mobile station when the mobile station is in a limited service state.
base station.
(Appendix 10)
A control method performed in a mobile station,
Receiving broadcast information broadcast in a cell; and controlling the operation of the mobile station based on a broadcast message included in the broadcast information;
With
The broadcast information includes an information element indicating whether or not the mobile station should discard the broadcast message when the mobile station is in a limited service state.
Method.
(Appendix 11)
A method performed in a base station,
Broadcasting broadcast information including a broadcast message to be received by a plurality of mobile stations in a cell,
The broadcast information includes an information element indicating whether the broadcast message should be discarded in the mobile station when the mobile station is in a limited service state.
Method.
(Appendix 12)
A non-transitory computer-readable medium storing a program for causing a computer to perform a control method related to a mobile station,
The control method includes controlling the operation of the mobile station based on a broadcast message included in broadcast information broadcast in a cell;
The broadcast information includes an information element indicating whether or not the mobile station should discard the broadcast message when the mobile station is in a limited service state.
A non-transitory computer readable medium.
(Appendix 13)
A non-transitory computer-readable medium storing a program for causing a computer to perform a control method related to a base station,
The control method comprises broadcasting broadcast information including a broadcast message so that a plurality of mobile stations can receive in a cell,
The broadcast information includes an information element indicating whether the broadcast message should be discarded in the mobile station when the mobile station is in a limited service state.
A non-transitory computer readable medium.

  This application claims the priority on the basis of Japanese application Japanese Patent Application No. 2013-079964 for which it applied on April 5, 2013, and takes in those the indications of all here.

1 Cellular Communication System 10 Cellular Communication Network 100 Broadcast Node (CBC)
200 Control node (MME or RNC)
201 PWS request unit 211 PWS request unit 300 Base station (eNodeB or NodeB)
301 Wireless communication unit 302 PWS transmission unit 310 Cell 400 Mobile station (UE)
401 Wireless communication unit 402 PWS control unit

Claims (30)

A control node configured to send a request message to request broadcast of a Public Warning System (PWS) notification;
A base station configured to receive the request message from the control node and broadcast broadcast information including the PWS notification in a cell;
A mobile station configured to receive the broadcast information;
With
Each of the request message and the broadcast information is
(A) a first information element indicating whether the mobile station should discard the PWS notification when the mobile station is in a limited service state; and (b) the mobile station is a Home Public Land Mobile Network (HPLMN). ) A second information element indicating whether or not the mobile station should discard the PWS notification when the PWS notification is not received from
Including at least one of
Cellular communication system.   The cellular communication system according to claim 1, wherein each of the request message and the broadcast information includes the first information element.   The cellular communication according to claim 2, wherein when the mobile station receives the PWS notification while in the limited service state, the mobile station determines whether to discard the PWS notification according to the first information element. system. Each of the request message and the broadcast information includes the second information element;
The mobile station determines whether to discard the PWS notification according to the second information element when receiving the PWS notification from another Public Land Mobile Network (PLMN) different from the HPLMN. Item 4. The cellular communication system according to any one of Items 1 to 3. The PWS notification includes a Warning Type parameter as an ETWS primary notification,
At least one of the first and second information elements is defined in the Warning Type parameter;
The cellular communication system of any one of Claims 1-4. The Warning Type parameter further includes a Warning type value field,
The Warning type value field indicates whether the PWS notification is for commercial use.
The cellular communication system according to claim 5.   The cellular communication according to any one of claims 1 to 4, wherein at least one of the first and second information elements is defined as a parameter different from the PWS notification in the request message and the broadcast information. system. A mobile station,
Wireless communication means for receiving broadcast information broadcast in a cell;
Control means for controlling the operation of the mobile station based on Public Warning System (PWS) notification included in the broadcast information;
With
The broadcast information is
(A) a first information element indicating whether the mobile station should discard the PWS notification when the mobile station is in a limited service state; and (b) the mobile station is a Home Public Land Mobile Network (HPLMN). ) A second information element indicating whether or not the mobile station should discard the PWS notification when the PWS notification is not received from
Including at least one of
The control means determines whether to discard the PWS notification according to the first or second information element,
Mobile station.   The mobile station according to claim 8, wherein the broadcast information includes the first information element.   10. The mobile station according to claim 9, wherein, when the PWS notification is received during the limited service state, the control unit determines whether to discard the PWS notification according to the first information element. . The broadcast information includes the second information element,
The mobile station determines whether to discard the PWS notification according to the second information element when receiving the PWS notification from another Public Land Mobile Network (PLMN) different from the HPLMN. Item 10. The mobile station according to any one of Items 8 to 10. The PWS notification includes a Warning Type parameter as an ETWS primary notification,
At least one of the first and second information elements is defined in the Warning Type parameter;
The mobile station according to any one of claims 8 to 11. The Warning Type parameter further includes a Warning type value field,
The Warning type value field indicates whether the PWS notification is for commercial use.
The mobile station according to claim 12.   The mobile station according to any one of claims 8 to 11, wherein at least one of the first and second information elements is defined as a parameter different from the PWS notification in the broadcast information. Control means for transmitting a request message to the base station;
The request message causes the base station to broadcast broadcast information including a Public Warning System (PWS) notification to the mobile station;
The request message is
(A) a first information element indicating whether the mobile station should discard the PWS notification when the mobile station is in a limited service state; and (b) the mobile station is a Home Public Land Mobile Network (HPLMN). ) A second information element indicating whether or not the mobile station should discard the PWS notification when the PWS notification is not received from
Including at least one of
Control node.   The control node according to claim 15, wherein the request message includes the first information element. The PWS notification includes a Warning Type parameter as an ETWS primary notification,
At least one of the first and second information elements is defined in the Warning Type parameter;
The control node according to claim 15 or 16. The Warning Type parameter further includes a Warning type value field,
The Warning type value field indicates whether the PWS notification is for commercial use.
The control node according to claim 17.   The control node according to claim 15 or 16, wherein at least one of the first and second information elements is defined as a parameter different from the PWS notification in the request message. A transmission means for broadcasting broadcast information including Public Warning System (PWS) notification to a mobile station in a cell,
The broadcast information is
(A) a first information element indicating whether the mobile station should discard the PWS notification when the mobile station is in a limited service state; and (b) the mobile station is a Home Public Land Mobile Network (HPLMN). ) A second information element indicating whether or not the mobile station should discard the PWS notification when the PWS notification is not received from
Including at least one of
base station.   The base station according to claim 20, wherein the broadcast information includes the first information element. The PWS notification includes a Warning Type parameter as an ETWS primary notification,
At least one of the first and second information elements is defined in the Warning Type parameter;
The base station according to claim 20 or 21. The Warning Type parameter further includes a Warning type value field,
The Warning type value field indicates whether the PWS notification is for commercial use.
The base station according to claim 22.   The base station according to claim 20 or 21, wherein at least one of the first information element and the second information element is defined as a parameter different from the PWS notification in the broadcast information. A method performed in a mobile station,
Receiving broadcast information broadcast in a cell, and controlling the operation of the mobile station based on Public Warning System (PWS) notification included in the broadcast information;
With
The broadcast information is
(A) a first information element indicating whether the mobile station should discard the PWS notification when the mobile station is in a limited service state; and (b) the mobile station is a Home Public Land Mobile Network (HPLMN). ) A second information element indicating whether or not the mobile station should discard the PWS notification when the PWS notification is not received from
Including at least one of
The controlling includes determining whether to discard the PWS notification according to the first or second information element;
Method. A method performed in a control node,
Sending a request message to the base station,
The request message causes the base station to broadcast broadcast information including a Public Warning System (PWS) notification to the mobile station;
The request message is
(A) a first information element indicating whether the mobile station should discard the PWS notification when the mobile station is in a limited service state; and (b) the mobile station is a Home Public Land Mobile Network (HPLMN). ) A second information element indicating whether or not the mobile station should discard the PWS notification when the PWS notification is not received from
Including at least one of
Method. A method performed in a base station,
Broadcasting broadcast information including Public Warning System (PWS) notification to mobile stations in a cell,
The broadcast information is
(A) a first information element indicating whether the mobile station should discard the PWS notification when the mobile station is in a limited service state; and (b) the mobile station is a Home Public Land Mobile Network (HPLMN). ) A second information element indicating whether or not the mobile station should discard the PWS notification when the PWS notification is not received from
Including at least one of
Method. A program for causing a computer to perform a control method related to a mobile station,
The control method includes controlling the operation of the mobile station based on Public Warning System (PWS) notification included in broadcast information broadcast in a cell,
The broadcast information is
(A) a first information element indicating whether the mobile station should discard the PWS notification when the mobile station is in a limited service state; and (b) the mobile station is a Home Public Land Mobile Network (HPLMN). ) A second information element indicating whether or not the mobile station should discard the PWS notification when the PWS notification is not received from
Including at least one of
The controlling includes determining whether to discard the PWS notification according to the first or second information element;
Program . A program for causing a computer to perform a control method related to a control node,
The control method comprises controlling the control node to transmit a request message to a base station,
The request message causes the base station to broadcast broadcast information including a Public Warning System (PWS) notification to the mobile station;
The request message is
(A) a first information element indicating whether the mobile station should discard the PWS notification when the mobile station is in a limited service state; and (b) the mobile station is a Home Public Land Mobile Network (HPLMN). ) A second information element indicating whether or not the mobile station should discard the PWS notification when the PWS notification is not received from
Including at least one of
Program . A program for causing a computer to perform a control method related to a base station,
The control method comprises controlling the base station to broadcast broadcast information including Public Warning System (PWS) notification to a mobile station in a cell,
The broadcast information is
(A) a first information element indicating whether the mobile station should discard the PWS notification when the mobile station is in a limited service state; and (b) the mobile station is a Home Public Land Mobile Network (HPLMN). ) A second information element indicating whether or not the mobile station should discard the PWS notification when the PWS notification is not received from
Including at least one of
Program .

Images