WO2013001987A1 - 通信装置及び通信方法 - Google Patents
通信装置及び通信方法 Download PDFInfo
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- WO2013001987A1 WO2013001987A1 PCT/JP2012/064399 JP2012064399W WO2013001987A1 WO 2013001987 A1 WO2013001987 A1 WO 2013001987A1 JP 2012064399 W JP2012064399 W JP 2012064399W WO 2013001987 A1 WO2013001987 A1 WO 2013001987A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/53—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers
- H04H20/59—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for emergency or urgency
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/40—Connection management for selective distribution or broadcast
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/90—Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/20—Manipulation of established connections
- H04W76/27—Transitions between radio resource control [RRC] states
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/50—Connection management for emergency connections
Definitions
- the present invention relates to a communication device and a communication method.
- a broadcast signal for example, a paging signal using a common control channel (CCCH), a broadcast signal using a broadcast control channel (BCCH), or a signal using a common traffic channel (CTCH) (For example, BMC).
- CCCH common control channel
- BCCH broadcast control channel
- CCH common traffic channel
- BMC common traffic channel
- the distribution information distributed in the event of an earthquake or tsunami is the primary notification signal (Primary Notification) that notifies the emergency information distribution with minimal information such as ⁇ earthquake '' or ⁇ tsunami ''.
- Primary Notification is the primary notification signal that notifies the emergency information distribution with minimal information such as ⁇ earthquake '' or ⁇ tsunami ''.
- This is done by sending a secondary notification signal indicating details (emergency information) such as seismic intensity and epicenter.
- the primary notification signal is transmitted through the common control channel CCCH
- the secondary notification signal is transmitted through the common traffic channel CTCH.
- the user apparatus UE can appropriately receive such a common traffic channel CTCH.
- the user apparatus UE in the cell DCH state (Cell_DCH) or the cell FACH state (Cell_FACH) that transmits and receives user data performs communication without referring to the common traffic channel CTCH.
- Non-Patent Document 1 describes that a user apparatus in a specific RRC protocol state can receive distribution information.
- the user apparatus UE In order to deal with this problem, for example, it is conceivable to design the user apparatus UE so that the common traffic CTCH can be received even when the dedicated channel is set (Cell_DCH). However, if such a function is essential for the user apparatus UE, the user apparatus UE must always monitor the common traffic channel CTCH as well as transmission / reception of user data. As a result, there is a concern that the battery will be consumed quickly and the cost of the user apparatus UE will increase.
- An object of the present invention is that when a user device in an RRC protocol state capable of communicating user data receives a primary notification signal for notifying the delivery of emergency information, the user device can receive a secondary notification signal including emergency information. Is to do so.
- a communication device is: A network side communication unit that receives emergency information from the information distribution node; A UE-side communication unit that transmits and receives a communication signal to and from a user apparatus via a radio base station, and the UE-side communication unit transmits a primary notification signal for notifying the delivery of the emergency information all at once, After individually transmitting an instruction signal instructing a transition of an RRC protocol state or a transition to another cell to the user apparatus, a secondary notification signal including the emergency information is transmitted all at once,
- the transition of the RRC protocol state is a transition from a state where emergency information (secondary notification) cannot be received to a state where emergency information (secondary notification) can be received,
- the other cell is a communication device that is a cell in which the user device can receive the secondary notification signal regardless of the RRC protocol state of the user device.
- a user device in an RRC protocol state capable of communicating user data receives a primary notification signal for notifying the delivery of emergency information
- the user device receives a secondary notification signal including emergency information. Can be able to.
- summary of a communication system The figure which shows an operation example.
- wireless network control apparatus The functional block diagram of a user apparatus.
- the user device when the user device recognizes that urgent information distribution is started, the user device is in a currently communicating state (for example, a state of data communication other than voice communication), It is determined whether or not a transition to a state in which distribution information can be received (for example, Cell_PCH or IDLE) is to be performed.
- the state transition may be performed after making an inquiry to the network, or may be autonomously performed on the user device side.
- the network control device RNC or the like has received urgent distribution information
- a user device that cannot receive such distribution information may be identified and a state transition may be prompted for the identified user device.
- a user apparatus that cannot receive urgent distribution information because it is communicating can quickly transition to a state in which it can be received, and can notify as many users as possible of the urgent distribution information.
- FIG. 1 shows a communication system that can be used in one embodiment.
- FIG. 1 shows various nodes of the communication system that are particularly relevant to the embodiment.
- the communication system is a third generation mobile communication system such as a WCDMA system or a GSM system, but the present invention can also be applied to other communication systems (for example, a second generation mobile communication system). It is.
- the communication system includes at least a cell broadcast entity CBE11, a cell broadcast center CBC12, a switching center MME13, a radio network controller RNC14, an LTE system base station eNB15, a 3G system base station BS (or NodeB) 15, and a user equipment UE16.
- CBE 11 is an information source that provides distribution information in the event of a disaster. Specifically, local governments and governments (for example, the Japan Meteorological Agency) fall under CBE.
- the Cell Broadcast Center (CBC) 12 creates distribution information that is actually distributed to the user device based on the information provided from the CBE 11.
- the CBC 12 may determine a region or an area where the distribution information is distributed based on the information provided from the CBE 11. For example, when an earthquake occurs, an area where the danger of tsunami is a concern may be specifically identified.
- the switching center MME 13 generally performs call processing of user equipment, and performs, for example, subscriber information management, mobility management, outgoing / incoming control, charging control, QoS control, and the like.
- the exchange MME13 in the present embodiment transfers the distribution information to the regional node (radio network controller RNC and / or base station eNB) designated by the CBC12.
- the radio network controller RNC14 generally performs processing related to call processing of the user device. For example, with respect to user equipment in the third generation mobile communication system, it performs control signal processing, state management, connection processing, handover processing, network maintenance management, etc. for radio resource control (Radio Resource Control: RRC).
- RRC Radio Resource Control
- the radio network controller RNC14 in the present embodiment transfers the distribution information to the regional base station designated by the CBC12.
- the user apparatus UE16 in the present embodiment operates in any one of a plurality of RRC protocol states (communication states), and the radio network controller RNC14 manages the RRC protocol state of the user apparatus UE16.
- the RRC protocol states in the third generation mobile communication system are a cell DCH state (Cell_DCH), a cell FACH state (Cell_FACH), a cell PCH state (Cell_PCH), and an idle state (IDLE).
- Cell_DCH cell DCH state
- Cell_FACH cell FACH state
- Cell_PCH cell PCH state
- IDLE idle state
- the user equipment receives the paging channel PICH intermittently in preparation for a call.
- An RRC connection is established in response to a call from the network or when originating.
- the user apparatus UE in the cell DCH state (Cell_DCH) and the cell FACH state (Cell_FACH), the user apparatus UE does not monitor the common traffic channel CTCH, but in the cell PCH state (Cell_PCH) and the idle state (IDLE), the user apparatus UE Monitor the common traffic channel CTCH.
- This point is different from the LTE mobile communication system in which the user apparatus UE can receive urgent distribution information regardless of whether the RRD protocol state is a connected state (Connected) or an idle state (IDLE).
- the LTE system base station eNB15 is a base station in an LTE mobile communication system.
- the base station eNB15 performs radio resource allocation control and the like when performing radio communication with the user apparatus UE16.
- the 3G system base station BS (or NodeB) 15 is a base station in the third generation mobile communication system.
- the user apparatus UE16 can appropriately receive distribution information such as ETWS in addition to enabling wireless communication by the user.
- Any communication device may be used.
- the user device is typically a mobile phone, but may be another device.
- the user device may be an information terminal, a high-performance mobile phone, a smartphone, a tablet computer, a personal digital assistant, a portable personal computer, a palmtop computer, a laptop computer, a desktop computer, or the like.
- the user apparatus UE16 operates in any one of a plurality of RRC protocol states (communication states).
- the RRC protocol states are a cell DCH state (Cell_DCH), a cell FACH state (Cell_FACH), a cell PCH state (Cell_PCH), and an idle state (IDLE).
- the RRC protocol states are a connected state (Connected) and an idle state (IDLE).
- FIG. 1 only the third generation mobile system and the LTE mobile communication system are illustrated for the sake of simplicity, but other communication systems may be included.
- a second generation mobile communication system, an LTE advanced mobile communication system, or the like may be included.
- FIG. 2 shows an operation example performed in the third generation mobile communication system of the communication system shown in FIG.
- step S201 when a disaster or emergency such as an earthquake occurs, the cell broadcast entity CBE11 such as the local government or the Japan Meteorological Agency requests the cell broadcast center CBC12 to distribute the distribution information.
- the cell broadcast entity CBE11 such as the local government or the Japan Meteorological Agency requests the cell broadcast center CBC12 to distribute the distribution information.
- an organization such as the Japan Meteorological Agency (CBE) creates distribution information by detecting the P wave (Primary Wave), which is the initial tremor, and sends it to the cell broadcast center CBC12. Notice.
- P wave Primary Wave
- the cell broadcast center CBC12 creates distribution information or a message to be notified to the user apparatus UE based on the information received together with the request.
- the cell broadcast center CBC12 also determines a distribution area for distributing the distribution information.
- the cell broadcast center CBC12 requests the wireless network control device 14 to distribute distribution information.
- the distribution information includes a disaster type, a distribution area, primary notification information, and secondary notification information (message text).
- the disaster type is expressed by the message identifier or serial number of the distribution information, and when a plurality of pieces of distribution information are transmitted at different times, the latest one is overwritten by the old one.
- the distribution area is information for identifying a specific area when the distribution information is to be notified limited to the specific area.
- the primary notification information includes minimum information such as “earthquake”, “tsunami”, “earthquake + tsunami”, and the like. Other detailed information is included in the secondary notification signal or the message body as emergency information.
- the information received by the radio network controller RNC14 is “distribution information”
- the secondary notification signal received by the user apparatus UE16 includes “emergency information”. Distribution information and emergency information may be used as synonyms.
- the radio network controller RNC14 delivers a primary notification signal (Primary Notification) including a minimum information portion such as “earthquake”, “tsunami”, or “earthquake + tsunami” to the user devices all at once.
- the primary notification signal is notified to the user apparatus as a paging signal using the common control channel CCCH. Since the primary notification information includes only the minimum information part of the distribution information, it can be notified to the user apparatus UE quickly.
- the user apparatus UE16 is operating in a cell FACH state (Cell_FACH).
- Cell_FACH cell FACH state
- the user apparatus UE16 may be operating in another state.
- the user apparatus UE16 may be operating in a cell DCH state (Cell_DCH).
- Cell_FACH cell FACH state
- Cell_DCH cell DCH state
- the user apparatus UE16 does not receive the common traffic channel CTCH, and thus cannot receive a secondary notification signal transmitted thereafter.
- the user apparatus UE16 in the cell FACH state (Cell_FACH) or the cell DCH state (Cell_DCH) can receive the primary notification signal transmitted on the common control channel CCCH in step S206.
- the radio network controller RNC14 performs the processing from step S205 onward, but this is not essential in the present embodiment, and the switching center MME13 and the non-replacement station MME13 are not used in place of the radio network controller RNC14.
- the illustrated core node may perform the processing after step S205.
- step S207 in response to receiving the primary notification signal, the user apparatus UE16 transmits a request signal for requesting the state transition of the RRC protocol state to the radio network controller RNC14.
- this request signal may be performed using an RRC message SIGNALING CONNECTION RELEASE INDICATION.
- the user apparatus UE16 is in the FACH state (Cell_FACH), and the state transition requested by the request signal is a transition from the FACH state (Cell_FACH) to the idle state (IDLE).
- the present embodiment is not limited to this state transition, and other state transitions may be requested.
- Transition from FACH state (Cell_FACH) to paging state (Cell_PCH) Transitions such as a transition from the DCH state (Cell_DCH) to the idle state (IDLE) and a transition from the DCH state (Cell_DCH) to the paging state (Cell_PCH) may be performed.
- a transition from the DCH state (Cell_DCH) to the idle state (IDLE) and a transition from the DCH state (Cell_DCH) to the paging state (Cell_PCH) may be performed.
- the RRC connection is released, so that the communication performed in the DCH state (Cell_DCH) cannot be continued as it is.
- the transition source of the state transition is the DCH state (Cell_DCH)
- the state transition from the DCH state (Cell_DCH) when performing data communication other than voice communication for example, low-importance e-mail
- the transition source of the state transition is the FACH state (Cell_FACH)
- the state transition is from the FACH state (Cell_FACH) when data communication other than voice communication is performed.
- step S209 in response to the request signal received from the user apparatus UE16, the radio network control apparatus RNC14 transmits to the user apparatus UE16 an instruction signal instructing that state transition should be performed.
- This instruction signal is individually transmitted to the specific user apparatus that has transmitted the request signal.
- step S211 the user apparatus UE16 performs state transition according to the instruction signal.
- the RRC protocol state transitions from the FACH state (Cell_FACH) to the idle state (IDLE).
- the radio network controller RNC14 notifies the base station 15 of the change of the notification signal.
- the notification change of the notification signal may be performed by a message such as “SYSTEM INFORMATION INFORMATION CHANGE INDICATION”, for example.
- step S215 the base station 15 transmits the changed notification signal.
- the notification signal after the change is for notifying the user apparatus of the timing of the secondary notification signal transmitted after the primary notification signal notified in step S206.
- the procedures of steps S213 and 215 for notification of change of the notification signal may be performed at the timing shown in the drawing, or may be performed together with step S206 of notification of the paging signal.
- the radio network controller RNC14 transmits a secondary notification signal including the emergency information to the user apparatus UE16 all at once.
- the secondary notification signal may be notified as a BMC-CBS message (Broadcast Multicast Control-Cell Broadcast Service message) by the common traffic channel CTCH.
- the secondary notification signal includes detailed emergency information such as seismic intensity and epicenter of each place.
- the secondary notification signal can be received at the timing indicated by the notification signal received in step S215.
- the secondary notification signal is transmitted a plurality of times at predetermined time intervals.
- the transmission timing and transmission interval of the secondary notification signal are indicated by the notification signal after the change in step S215. Note that it is theoretically possible for the user apparatus UE16 to receive the secondary notification signal by constantly monitoring the common traffic channel CTCH after step S211 without using such timing information. . However, from the viewpoint of battery saving, it is preferable to receive the secondary notification signal at the timing indicated by the changed notification signal (step S215) and to save power consumption at other timings.
- step S219 after the reception of the secondary notification signal is completed, the user apparatus UE16 transmits a return request signal for returning to the original state to the radio network control apparatus RNC14.
- the return request signal since the original state is the cell FACH state (Cell_FACH), the return request signal requests a state transition from the idle state (IDLE) to the cell FACH state (Cell_FACH).
- the return request signal in this case may be performed using a cell update message (cell) update ⁇ ⁇ message) that is used when a call connection is requested when data to be transmitted occurs in the idle state (IDLE). Good.
- step S221 the radio network controller RNC14 transmits an instruction signal for returning to the original state to the user apparatus 16.
- This instruction signal is individually transmitted to the specific user device that has transmitted the return request signal.
- step S223 the user apparatus UE16 performs state transition according to the instruction signal.
- the RRC protocol state transitions from the idle state (IDLE) to the FACH state (Cell_FACH).
- the user apparatus operating in a state where it cannot receive the secondary notification signal including emergency information has transitioned to a state where it can receive the secondary notification signal.
- the present embodiment is not limited to this form.
- the user apparatus UE16 may transition to a cell or a communication system (RAT) that can receive the secondary notification signal. This is because the primary and secondary notification signals are notified not only in the third generation mobile communication system but also in other communication systems.
- RAT communication system
- the user apparatus UE16 requests the radio network controller RNC14 to change the operating state or the RAT (or the cell).
- the user equipment UE16 located in the third generation communication system can also operate in the long term evolution (LTE) communication system, and at the time of step S207, the LTE communication system or Suppose that it is located in a place where it can be transferred to a cell.
- LTE long term evolution
- the RRC protocol state of the user apparatus is a connected state (Connected) or an idle state (IDLE), and primary and secondary notification information can be received in any state.
- the radio network controller RNC14 may instruct such a user apparatus UE16 to move from the third generation communication system to the LTE communication system or cell.
- the user apparatus UE16 moves to the LTE communication system or cell, and receives the secondary notification signal at the transfer destination, or the primary notification signal and the transfer destination LTE communication system. Both secondary notification signals will be received.
- the return procedure in steps S219, S221, and S223 is not essential.
- the transition or transition from the third generation communication system to the LTE communication system may be performed by inter-system handover, or may be performed by redirection (Redirect) that once releases and reconnects. Good.
- the radio network controller RNC14 determines whether the transition is permitted and the destination of the transition, and provides an instruction signal indicating the determined content in step S209. May be transmitted. Such a determination may be made based on a communication state or a communication signal. For example, when the type of communication call of the communication signal performed by the user apparatus UE16 is a communication with a non-strict delay request other than a voice call, the transition of the state, the cell, or the communication system is permitted. In some cases, the transition may be rejected.
- a transition of a state, a cell, or a communication system may be permitted if the communication amount or data amount is less than a predetermined threshold, and if not, the transition may be rejected.
- the communication speed of the communication signal performed by the user apparatus UE16 is slower than a predetermined threshold, the transition of the state, the cell or the communication system is permitted, and if not, the transition is rejected Also good.
- the communication signal being performed by the user apparatus UE16 is not important communication, the transition of the state, the cell, or the communication system is permitted, and when the communication signal is important communication, the transition is rejected. May be.
- the determination of whether or not state transition is possible is merely an example, and whether or not state transition is possible may be determined from another viewpoint.
- the radio network controller RNC14 may store the user apparatus whose transition is rejected as a result of determining whether or not state transition is possible.
- the secondary notification signal may be notified by an individual signal or individual data distribution to the user apparatus that has been denied the transition.
- the radio network controller RNC14 determines whether or not to allow transition and the transition destination in accordance with the request signal from the user apparatus UE16 in step S207.
- the permission / inhibition of transition and the transition destination may be determined, and the instruction signal in step S209 may be transmitted.
- the radio network controller RNC14 manages the communication state (RRC protocol state) of all the user apparatuses UE16 under its control. Therefore, when the wireless network control device RNC14 receives the distribution information in step S205 and distributes the distribution information, it can identify which user device cannot receive the distribution information.
- the radio network controller RNC14 refers to the communication state of the user apparatus UE16 managed by the state management unit described later, so that the communication state is the cell DCH state (Cell_DCH) or the cell FACH state (Cell_FACH).
- the user apparatus UE16 that is is specified.
- an instruction signal may be transmitted to the user apparatus identified in this way to prompt state transition or the like.
- the radio network controller RNC14 (or an exchange, etc.) instructs the user apparatus UE16 to perform state transition, cell transition, or communication system transition.
- the radio network controller RNC14 instructs the user apparatus UE16 to perform state transition, cell transition, or communication system transition.
- this is not essential for the present embodiment, and the user apparatus UE16 may autonomously determine the state transition.
- Fig. 3 shows an example of such a deformation operation. 2 is generally the same as the operation example of FIG. 2, except that step S207 for requesting the state transition and step S209 for notifying the instruction signal accordingly are not performed before step S211 for performing the state transition. .
- the user apparatus UE16 performs state transition in step S211 in response to receiving the primary notification signal. For example, state transition is performed from the FACH state (Cell_FACH) to the idle state (IDLE). Further, the example shown in FIG. 3 also shows that step S219 for requesting the state transition and step S221 for notifying the instruction signal accordingly are not performed before step S223 for performing the state transition for return. It is different from the example shown in. For example, the state transition is performed from the idle state (IDLE) to the FACH state (Cell_FACH).
- the user apparatus UE16 may determine whether to perform state transition, cell transition, or communication system transition and a transition destination based on the communication state or communication signal. Good. For example, when the type of communication call of the communication signal performed by the user apparatus UE16 is a communication with a non-strict delay request other than a voice call, the transition of the state, the cell, or the communication system is permitted. In some cases, the transition may be rejected. As another example, when the communication amount or the data amount of the communication signal being performed by the user apparatus UE16 is less than a predetermined threshold, it is determined to perform a state, cell, or communication system transition, and if not, May be determined not to make a transition.
- the communication speed of the communication signal being performed by the user apparatus UE16 is slower than a predetermined threshold, it is determined to perform the transition of the state, the cell, or the communication system, and if not, the transition is performed. It may be determined not to be performed.
- the communication signal being performed by the user apparatus UE16 is not important communication, it is determined that the state, cell, or communication system transition is performed, and if it is important communication, The transition may not be performed.
- the determination of whether or not state transition is possible is merely an example, and whether or not state transition is possible may be determined from another viewpoint.
- FIG. 4 shows a functional block diagram of the radio network controller RNC as shown in FIG. However, a similar function may be provided in the switching center MME and other core nodes.
- FIG. 4 shows various functional units or processing units included in the communication apparatus that are particularly relevant to the embodiment.
- the radio network controller RNC14 includes at least a network side communication unit 41, a distribution information processing unit 42, a UE side communication unit 43, a state management unit 44, a notification signal processing unit 45, and a control unit 46.
- the network side communication unit 41 receives distribution information from an upper node such as the cell broadcast center CBC.
- the distribution information may be received together with information specifying a region for distribution.
- the distribution information processing unit 42 identifies a distribution area from the distribution information received by the network side communication unit 41, and extracts or creates a primary notification signal and a secondary notification signal.
- the UE side communication unit 43 has a function of transmitting a signal to the user apparatus UE and a function of receiving a signal from the user apparatus UE.
- the signal transmitted toward the user device includes a primary notification signal, a secondary notification signal, a control signal, user data, and the like. Signals received from the user device are control signals and user data.
- the state management unit 44 manages the RRC protocol state (communication state) of the user apparatus UE. Specifically, it manages to which of a plurality of predetermined communication states the current communication state of the user apparatus UE corresponds.
- the predetermined plurality of communication states are a cell DCH state (Cell_DCH), a cell FACH state (Cell_FACH), a cell PCH state (Cell_PCH), and an idle state (IDLE).
- the notification signal processing unit 45 processes (including creation, change, and editing) a notification signal to be transmitted to the user apparatus UE. For example, when the radio network controller RNC is to distribute distribution information, the notification signal processing unit 45 creates a notification signal indicating the transmission timing of the secondary notification signal, and is under the control of the control unit 46. Then, the changed notification signal is passed to the UE-side communication unit 43.
- the control unit 46 controls each functional unit of the radio network controller RNC.
- the control unit 46 enables the radio network controller RNC to execute a part related to the radio network controller RNC among the operations described with reference to FIGS. 2 and 3.
- FIG. 5 shows a functional block diagram of the user apparatus.
- FIG. 5 shows various functional units or processing units provided in the user apparatus that are particularly relevant to the embodiment.
- the user device includes at least a communication unit 51, a state management unit 52, and a control unit 53.
- the communication unit 51 has a function of receiving a signal from a radio access device (Radio Access Network: RAN) and a function of transmitting a signal toward the radio access device RAN.
- the radio access device RAN is a device that includes a base station BS and a radio network controller RNC.
- the signal received from the radio access device RAN includes distribution information, a control signal, user data, and the like.
- the signal transmitted toward the radio access device RAN includes a control signal and user data.
- the state management unit 52 manages the RRC protocol state (communication state) of the user apparatus UE, similarly to the state management unit 44 in FIG. Specifically, it manages to which of a plurality of predetermined communication states the current communication state of the user apparatus UE corresponds.
- the predetermined plurality of communication states are a cell DCH state (Cell_DCH), a cell FACH state (Cell_FACH), a cell PCH state (Cell_PCH), and an idle state (IDLE).
- a connected state Connected
- IDLE idle state
- the control unit 53 controls the operation in the user device.
- the control unit 53 enables the user device to execute a part related to the user device among the operations described with reference to FIGS. 2 and 3.
- the present invention may be applied to any appropriate mobile communication system that distributes emergency information.
- the distribution information distributed all at once is related to a natural disaster, but it may be not only a natural disaster but also an artificial situation such as an international conflict.
- specific numerical examples have been described in order to facilitate understanding of the invention, these numerical values are merely examples and any appropriate values may be used unless otherwise specified.
- the classification of the examples or items is not essential to the present invention, and the items described in two or more items may be used in combination as necessary, and the items described in one item may be combined with other items.
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Abstract
Description
情報配信ノードから緊急情報を受信する網側通信部と、
無線基地局を介してユーザ装置との間で通信信号を送受信するUE側通信部と
を有し、前記UE側通信部が、前記緊急情報の配信を予告する一次通知信号を一斉に送信し、RRCプロトコル状態の遷移又は他セルへの遷移を指示する指示信号を前記ユーザ装置に個別に送信した後に、前記緊急情報を含む二次通知信号を一斉に送信し、
前記RRCプロトコル状態の遷移は、緊急情報(二次通知)を受信することはできない状態から、緊急情報(二次通知)を受信可能な状態への遷移であり、
前記他セルは、ユーザ装置のRRCプロトコル状態によらず該ユーザ装置が前記二次通知信号を受信できるセルである、通信装置である。
2.動作例
3.変形動作例
3.1 セル又はRATの変更
3.2 遷移要求の制限
3.3 ユーザ装置による自律遷移
4.無線ネットワーク制御装置RNC
5.ユーザ装置UE
<実施例1>
<1.通信システム>
図1は、一実施例において使用することが可能な通信システムを示す。図1は通信システムに備わる様々なノードのうち実施例に特に関連するものを示している。説明の便宜上、通信システムは、WCDMA方式やGSM方式等の第3世代の移動通信システムであるとするが、本発明は他の通信システム(例えば、第2世代の移動通信システム)にも適用可能である。通信システムは、セルブロードキャストエンティティCBE11、セルブロードキャストセンタCBC12、交換局MME13、無線ネットワーク制御装置RNC14、LTEシステムの基地局eNB15、3Gシステムの基地局BS(又はNodeB)15、ユーザ装置UE16を少なくとも含む。
図2は、図1に示される通信システムの第3世代の移動通信システムにおいて行われる動作例を示す。
FACH状態(Cell_FACH)からページング状態(Cell_PCH)への遷移、
DCH状態(Cell_DCH)からアイドル状態(IDLE)への遷移、及び
DCH状態(Cell_DCH)からページング状態(Cell_PCH)への遷移
等の遷移が行われてもよい。何れにせよ、二次通知信号を受信できない状態から、二次通知信号を受信できる状態へ遷移が行われればよい。ただし、DCH状態(Cell_DCH)からアイドル状態(IDLE)等へ遷移すると、RRCコネクションが解放されるので、DCH状態(Cell_DCH)において行っていた通信をそのまま継続することはできなくなってしまう。従って、状態遷移の遷移元がDCH状態(Cell_DCH)である場合は、音声通話以外のデータ通信(例えば、重要度の低い電子メール等)を行っている場合のDCH状態(Cell_DCH)からの状態遷移であることが好ましい。同様に、状態遷移の遷移元がFACH状態(Cell_FACH)である場合も、音声通話以外のデータ通信を行っている場合のFACH状態(Cell_FACH)からの状態遷移であることが好ましい。
<<3.1 セル又はRATの変更>>
図2に示す例では、緊急情報を含む二次通知信号を受信できない状態で動作しているユーザ装置が、二次通知信号を受信できる状態に遷移していた。本実施例はこの形態に限定されない。例えば、ユーザ装置UE16は、二次通知信号を受信できる状態に遷移する代わりに、二次通知信号を受信できるセル又は通信システム(RAT)に遷移してもよい。一次及び二次通知信号は、第3世代方式の移動通信システムだけでなく他の通信システムでも通知されるからである。
図2に示す例では、二次通知信号を受信できる状態でないユーザ装置UE16が、ステップS206において一次通知信号を受信すると、ステップS207において状態遷移等を求める要求信号を送信している。従って、二次通知信号を受信できる状態でないユーザ装置UE16の数が非常に多かった場合、或いはネットワーク側の処理能力が十分に多くなかった場合、無線ネットワーク制御装置RNC14は、多数の要求信号に起因して輻輳してしまうことが懸念される。
図2に示す例では、無線ネットワーク制御装置RNC14(又は交換局等)が、ユーザ装置UE16に対して、状態遷移、セルの遷移又は通信システムの遷移を指示していた。しかしながら、このことは本実施例に必須ではなく、ユーザ装置UE16が自律的に状態遷移を決定してもよい。
図4は、図1に示されているような無線ネットワーク制御装置RNCの機能ブロック図を示す。ただし、同様な機能が交換局MMEやその他のコアノードに備わっていてもよい。図4には通信装置に備わる様々な機能部又は処理部のうち実施例に特に関連するものが示されている。無線ネットワーク制御装置RNC14は、網側通信部41、配信情報処理部42、UE側通信部43、状態管理部44、報知信号処理部45及び制御部46を少なくとも有する。
図5は、ユーザ装置の機能ブロック図を示す。図5にはユーザ装置に備わる様々な機能部又は処理部のうち実施例に特に関連するものが示されている。ユーザ装置は、通信部51、状態管理部52及び制御部53を少なくとも有する。
12 セルブロードキャストセンタCBC
13 交換局MME
14 無線ネットワーク制御装置RNC
15 LTEシステムの基地局eNB、3Gシステムの基地局BS
16 ユーザ装置
41 網側通信部
42 配信情報処理部
43 UE側通信部
44 状態管理部
45 報知信号処理部
46 制御部
51 通信部
52 状態管理部
53 制御部
Claims (10)
- 情報配信ノードから緊急情報を受信する網側通信部と、
無線基地局を介してユーザ装置との間で通信信号を送受信するUE側通信部と
を有し、前記UE側通信部が、前記緊急情報の配信を予告する一次通知信号を一斉に送信し、RRCプロトコル状態の遷移又は他セルへの遷移を指示する指示信号を前記ユーザ装置に個別に送信した後に、前記緊急情報を含む二次通知信号を一斉に送信し、
前記RRCプロトコル状態の遷移は、緊急情報を受信することはできない状態から、緊急情報を受信可能な状態への遷移であり、
前記他セルは、ユーザ装置のRRCプロトコル状態によらず該ユーザ装置が前記二次通知信号を受信できるセルである、通信装置。 - 前記UE側通信部が、前記一次通知信号に応答して要求信号を送信した特定のユーザ装置に対して、前記指示信号を送信する、請求項1記載の通信装置。
- 前記特定のユーザ装置による前記要求信号の送信可否、送信待ち時間及び再送回数の内の少なくとも1つが、前記UE側通信部から送信される報知信号により示されている、請求項2記載の通信装置。
- 当該通信装置が、ユーザ装置のRRCプロトコル状態を管理する状態管理部を更に有し、
前記網側通信部が前記緊急情報を受信した場合に、RRCプロトコル状態が緊急情報を受信することはできない状態である特定のユーザ装置を、前記状態管理部が判別し、
前記UE側通信部が、前記RRCプロトコル状態の遷移を促す前記指示信号を前記特定のユーザ装置に送信する、請求項1記載の通信装置。 - 当該通信装置が、前記特定のユーザ装置が行っている通信の呼種別、通信量、通信速度及び重要度の内の少なくとも1つに応じて、前記特定のユーザ装置に前記指示信号を送信するか否かを決定する決定部を更に有する、請求項4に記載の通信装置。
- 前記UE側通信部は、前記指示信号を送信しなかったユーザ装置を記憶し、当該記憶したユーザ装置に対して個別信号又は個別データ配信による通知を行なう、請求項1または4に記載の通信装置。
- 当該通信装置が、前記ユーザ装置が行っている通信の呼種別、通信量、通信速度及び重要度の内の少なくとも1つに応じて、前記ユーザ装置に前記指示信号を送信するか否かを決定する決定部を更に有する、請求項1に記載の通信装置。
- 情報配信ノードから緊急情報を受信し、
前記緊急情報の配信を予告する一次通知信号を一斉に配信し、
RRCプロトコル状態の遷移又は他セルへの遷移を指示する指示信号を特定のユーザ装置に個別に送信し、
前記緊急情報を含む二次通知信号を一斉に配信するステップ
を有し、前記RRCプロトコル状態の遷移は、緊急情報を受信することはできない状態から、緊急情報を受信可能な状態への遷移であり、
前記他セルは、ユーザ装置のRRCプロトコル状態によらず該ユーザ装置が前記二次通知信号を受信できるセルである、通信方法。 - 無線アクセス装置との間で通信信号を送受信する通信部と、
前記通信部が緊急情報の配信を予告する一斉に配信された一次通知信号を受信した場合に、RRCプロトコル状態の遷移又は他セルへの遷移を行うことを決定する決定部と
を有し、前記RRCプロトコル状態の遷移は、緊急情報を受信することはできない状態から、緊急情報を受信可能な状態への遷移であり、
前記他セルは、ユーザ装置のRRCプロトコル状態によらず該ユーザ装置が前記二次通知信号を受信できるセルであり、
前記通信部は、前記RRCプロトコル状態の遷移又は他セルへの遷移の後に、前記緊急情報を含む一斉に配信された二次通知信号を受信する、通信装置。 - 無線アクセス装置から、緊急情報の配信を予告する一斉に配信された一次通知信号を受信した場合に、RRCプロトコル状態の遷移又は他セルへの遷移を行うことを決定し、
前記RRCプロトコル状態の遷移又は他セルへの遷移の後に、前記緊急情報を含む一斉に配信された二次通知信号を受信するステップ
を有し、前記RRCプロトコル状態の遷移は、緊急情報を受信することはできない状態から、緊急情報を受信可能な状態への遷移であり、
前記他セルは、ユーザ装置のRRCプロトコル状態によらず該ユーザ装置が前記二次通知信号を受信できるセルである、通信方法。
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