KR20090100282A - Method of receiving a disaster warning message using a paging message in mobile communication system - Google Patents

Abstract

PURPOSE: A method for receiving a disaster alarm message by using a paging message in a mobile communication system is provided to reduce the waste of a terminal battery by making the terminal receive a downlink shared channel to receive the disaster alarm message. CONSTITUTION: A method for receiving a disaster alarm message in a mobile communication system comprises the following steps of: receiving a paging message from a network, wherein the paging message includes information related to the alarm message; and receiving the alarm message through a downlink channel according to the information.

Description

How to Receive Disaster Alert Message Using Call Message in Mobile System {METHOD OF RECEIVING A DISASTER WARNING MESSAGE USING A PAGING MESSAGE IN MOBILE COMMUNICATION SYSTEM}

The present invention relates to a wireless communication system and a terminal for providing a wireless communication service, and to a base station in an Evolved Universal Mobile Telecommunications System (E-UMTS) or a Long Term Evolution System (LTE), which has been evolved from a Universal Mobile Telecommunications System (UMTS). The present invention relates to a method for transmitting and receiving a disaster alert message, and in particular, a base station transmits the disaster alert message in a call message transmitted to various terminals, and a wireless terminal to receive the disaster alert message monitors the call message. And, when the monitored call message instructs the broadcast of the disaster alarm message, the terminal receives a downlink shared channel to the method for receiving the disaster alarm message.

1 is a diagram illustrating a network structure of an E-UTRAN (Evolved Universal Terrestrial Radio Access Network) which is a mobile communication system to which the present invention and the present invention are applied. The E-UTRAN system is an evolution from the existing UTRAN system and is currently undergoing basic standardization work in 3GPP. The E-UTRAN system is also called a Long Term Evolution (LTE) system.

The E-UTRAN consists of base stations (hereinafter abbreviated as eNode B or eNB). The eNBs are connected via an X2 interface. The eNB is connected to a user equipment (hereinafter abbreviated as UE) through a wireless interface and is connected to an Evolved Packet Core (EPC) through an S1 interface.

Layers of the radio interface protocol between the terminal and the network are based on the lower three layers of the Open System Interconnection (OSI) reference model, which is widely known in communication systems. (Second layer) and L3 (third layer), wherein a physical layer belonging to the first layer provides an information transfer service using a physical channel, and a third layer. The radio resource control layer (hereinafter referred to as RRC) layer located in the layer plays a role of controlling radio resources between the terminal and the network. To this end, the RRC layer exchanges RRC messages between the terminal and the network.

FIG. 2 illustrates a structure of a radio interface protocol between a terminal and a UTRAN (UMTS Terrestrial Radio Access Network) based on the 3GPP radio access network standard. The wireless interface protocol of FIG. 2 consists of a physical layer, a data link layer, and a network layer horizontally, and a user plane for transmitting data information vertically. And Control Plane for Signaling. The protocol layers of FIG. 2 are based on the lower three layers of the Open System Interconnection (OSI) reference model, which are well known in communication systems, and include L1 (first layer), L2 (second layer), and L3 (first layer). Three layers).

The physical layer, which is the first layer, provides an information transfer service to an upper layer by using a physical channel. The physical layer is connected to the upper medium access control layer through a transport channel, and data between the medium access control layer and the physical layer moves through the transport channel. Then, data moves between different physical layers, that is, between physical layers of a transmitting side and a receiving side through a physical channel. The physical channel is modulated by an orthogonal frequency division multiplexing (OFDM) scheme and utilizes time and frequency as radio resources.

Medium access control (hereinafter referred to as MAC) of the second layer provides a service to a radio link control layer, which is a higher layer, through a logical channel. The radio link control layer (hereinafter referred to as RLC) layer of the second layer supports reliable data transmission. The functionality of the RLC layer may be implemented as a functional block inside the MAC. In this case, the RLC layer may not exist. The PDCP layer of the second layer is a header compression that reduces the IP packet header size, which is relatively large and contains unnecessary control information, for efficient transmission in a low bandwidth wireless section when transmitting an IP packet such as IPv4 or IPv6. Compression) function.

The radio resource control layer (hereinafter abbreviated as RRC) layer located at the bottom of the third layer is defined only in the control plane, and the configuration and resetting of radio bearers (abbreviated as RB) are performed. It is responsible for the control of logical channels, transport channels and physical channels in relation to configuration and release. In this case, RB means a service provided by the second layer for data transmission between the terminal and the UTRAN. If there is an RRC connection (RRC Connection) between the RRC of the terminal and the RRC layer of the wireless network, the terminal is in the RRC connected mode (Connected Mode), otherwise it is in the RRC idle mode (Idle Mode).

The NAS (Non-Access Stratum) layer located above the RRC layer performs functions such as session management and mobility management.

One cell constituting the eNB is set to one of the bandwidth, such as 1.25, 2.5, 5, 10, 20Mhz to provide a downlink or uplink transmission service to multiple terminals. In this case, different cells may be configured to provide different bandwidths.

The downlink transmission channel for transmitting data from the network to the UE includes a BCH (Broadcast Channel) for transmitting system information, a Paging Channel (PCH) for transmitting a paging message, and a downlink SCH (Shared Channel for transmitting user traffic or control messages). There is. Traffic or control messages of a downlink multicast or broadcast service may be transmitted through a downlink SCH or may be transmitted through a separate downlink multicast channel (MCH). Meanwhile, the uplink transmission channel for transmitting data from the terminal to the network includes a random access channel (RAC) for transmitting an initial control message and an uplink shared channel (SCH) for transmitting user traffic or control messages.

The logical channel is located above the transport channel and is mapped to the transport channel. Logical channels are roughly divided into logical channels for control and logical channels for traffic.

3 is an exemplary view showing a control channel transmission of the prior art. The physical channel is composed of several subframes on the time axis and several subcarriers on the frequency axis. Here, one sub-frame consists of a plurality of symbols on the time axis. One subframe consists of a plurality of resource blocks, and one resource block consists of a plurality of symbols and a plurality of subcarriers. In addition, each subframe may use specific subcarriers of specific symbols (eg, the first symbol) of the corresponding subframe for a physical downlink control channel (PDCCH), that is, an L1 / L2 control channel. One subframe is 0.5 ms, and a transmission time interval (TTI), which is a unit time for transmitting data, is 1 ms corresponding to two subframes.

The wireless network may perform an MBMS counting process to determine whether a terminal receiving a specific MBMS service in a specific cell or to count the number of terminals. In the MBMS counting process, when the wireless network transmits an access information message through the MCCH channel, the terminal transmits an RRC connection request message or a cell update message in response to the access information message. Say the process.

4 shows a network structure for cell broadcast service in UTRAN. CBS messages originate from a number of Cell Broadcast Entity (hereinafter referred to as CBE) connected to a Cell Broadcast Center (hereinafter referred to as CBC). The CBE divides the CBS message into a number of pages. The CBC is a node of the core network and manages CBS messages to perform scheduling functions for CBS messages. Iu-BC is an interface defined between the CBC and the RNC. The Service Area Broadcast Protocol (hereinafter abbreviated as SABP) is used here. The CBC may use the SABP protocol to instruct the RNC to broadcast a new message or to modify or stop an existing broadcast message. The RNC schedules CBS messages delivered by the CBC and broadcasts them to a specific cell using the BMC protocol. In addition, the RNC provides a broadcast / multicast interworking function (hereinafter abbreviated as BMC-IWF) on the BMC layer to interpret messages and information received from the CBC. The terminal performs a function of receiving a CBS message broadcast in the UTRAN.

BMC messages used in the BMC protocol include a CBS message for delivering user information, a Schedule message for facilitating the reception of a CBC message of a terminal, and a CBS41 message for delivering a short message delivered in an ANSI41 network. All messages are transmitted only from the UTRAN to the terminal through the logical channel Common Traffic Channel (CTCH) channel. The UE may reduce battery usage by performing a discontinuous reception (hereinafter, abbreviated as DRX) function using information of a schedule message transmitted by the UTRAN through a logical traffic channel (CTCH) channel.

In the prior art, when receiving a disaster alert message through a CBS (Cell Broadcast Service) method, the terminal sets a channel for transmitting a disaster alert message, and then periodically monitors the channel to determine whether there is a broadcast of the disaster alert message. . Thereafter, the terminal continuously monitors the channel until the terminal releases the set channel. However, in the above-described prior art, there is a big problem of wasting the terminal battery since the terminal must continuously monitor the channel.

Therefore, the present invention is to reduce the waste of the terminal battery, which is a problem in the prior art, and to transmit and receive a disaster alarm message more effectively.

In order to solve the above problems of the present invention, a method of receiving a warning message (warning message) on a wireless communication system, in the step of receiving a paging message (paging message) from the network, the paging message to the alert message Includes related information; And receiving the alert message through the downlink channel according to the information.

Preferably, the alert message is characterized in that the Earthquake and Tsunami Warning System (ETWS) message.

Preferably, the call message is characterized in that it is received through a paging control channel (PCCH).

Preferably, the call message is characterized in that it comprises a first ETWS notification (primary ETWS notification) and a second ETWS notification (secondary ETWS notification).

Advantageously, said first ETWS notification is received prior to receipt of said second ETWS notification.

Preferably, the downlink channel is a downlink shared channel (DL-SCH).

In the present invention, in a wireless network that transmits a call message indicating whether to broadcast a disaster alert message to a plurality of terminals, the wireless terminal to receive a disaster alert message monitors the call message transmitted by the wireless network, the monitored call message Instructing the broadcast of the disaster alert message, the terminal receives a downlink shared channel to receive the disaster alert message has a great effect to reduce the terminal battery waste.

The present invention is applied to 3GPP communication technology, in particular UMTS (Universal Mobile Telecommunications System) system, communication device and communication method. However, the present invention is not limited thereto and may be applied to all wired and wireless communication to which the technical spirit of the present invention can be applied.

The basic concept of the present invention is a method for receiving a warning message on a wireless communication system, the method comprising the steps of receiving a paging message from a network, wherein the paging message includes information related to the alert message. ; And a method for receiving an alert message in a wireless communication system, the method comprising receiving the alert message through a down channel according to the information, and a wireless mobile communication terminal capable of performing such a method. .

In addition, a method of transmitting a warning message on a wireless communication system, comprising transmitting information related to an information message in a paging message and transmitting the alarm message on a wireless communication system, characterized in that for transmitting to the terminal. We propose a method and a network that can perform this method.

Hereinafter, the configuration and operation of the embodiments according to the present invention will be described with reference to the accompanying drawings.

5 is an exemplary diagram illustrating a method for transmitting an ETWS (Earth Warning Message; Earthquake and Tsunami Warning System) message of an E-UTRAN according to the present invention. In the present invention, the ETWS message (disaster alarm message) is a control logical channel (control logical channel) for broadcasting a control message to a plurality of terminals (transport channel) to which the control logical channel is mapped (downlink shared channel); May be transmitted through a DL-SCH.

As shown in FIG. 5, in a first step, the terminal periodically receives a call message. Here, if the call message indicates the broadcast of the disaster warning (ETWS) message, the terminal proceeds to the second step to receive the disaster warning (ETWS) message. However, if the call message does not instruct the broadcasting of the disaster alert (ETWS) message, the terminal does not proceed to the second step to receive the disaster alert (ETWS) message. In general, the call message is transmitted from the network when the terminal is in an idle mode, and the call message is received through a paging control channel (PCCH).

Although not shown in FIG. 5, as a first step of another method, the terminal receives system information (SI) transmitted through a broadcast control channel (BCCH). If the system information includes disaster warning (ETWS) message broadcasting related information (eg, setting information), the terminal proceeds to a second step to receive an emergency alert (ETWS) message. If the system information transmitted through the BCCH does not include ETWS message broadcasting related information (for example, setting information), the terminal does not proceed to the second step to receive an ETWS message. Do not.

In a second step, the terminal receives a Physical Downlink Control Channel (PDCCH) to receive a DL-SCH during a time period (Time Period / Time Window) allocated for disaster alert (ETWS) transmission. . In this case, the terminal may receive a specific Radio Network Temporary Identifier (RNTI) through the PDCCH.

In a third step, when the specific RNTI (eg, RNTI for ETWS; ETWS RNTI) is indicated to the PDCCH in the second step, the terminal receives an ETWS message through the DL-SCH corresponding to the PDCCH. . However, if the specific RNTI (ETWS RNTI) is not indicated to the PDCCH, the UE may not receive an ETWS message through the DL-SCH corresponding to the PDCCH.

Here, the DL-SCH, to which the disaster alert message is transmitted, is a transport channel, and is mapped to a logical control channel (for example, a shared logical channel), which is a logical channel through which various terminals commonly receive control information in order to transmit the disaster alert message. Accordingly, the disaster alert message is transmitted through the logical control channel and the transport channel DL-SCH channel. The terminal may also receive a disaster alert message through the logical control channel and the transport channel DL-SCH channel.

Here, the base station may retransmit the disaster warning (ETWS) message through the HARQ scheme of the DL-SCH, when the terminal does not completely receive the disaster alert (ETWS) message, the disaster is retransmitted through the HARQ scheme You can also receive alerts (ETWS) messages again. The call message, the system information and the disaster alert (ETWS) message may be divided into a first alert notification / notification / notification (Primary ETWS notification) and a second alert notification / notification / notification (Secondary ETWS notification). The terminal may receive the second alarm notification / notification / notification after receiving the first alarm notification / notification / notification according to a situation.

Then, when the disaster alert situation is over, the wireless network does not instruct the broadcast of further disaster alert (ETWS) message through the call message. In this case, the wireless network instructs the end of the broadcast of the disaster warning (ETWS) message through another call message, or transmits the radio network temporary indicator (RNTI) for terminating the emergency alert (ETWS) broadcast through the PDCCH, Alternatively, the ETWS message broadcast related information included in the system information of BCCH is removed.

In this case, if the terminal receives the broadcast termination instruction of the disaster warning (ETWS) message through the call message or receives the radio network temporary indicator for terminating the disaster warning (ETWS) broadcast through the PDCCH, or the system information of the BCCH When there is no information related to disaster warning (ETWS) message broadcasting, the terminal stops receiving the disaster warning (ETWS) message or stops receiving a downlink channel transmitting a disaster warning (ETWS) message or disaster warning (ETWS). Unset the downlink channel for sending messages.

As described above, the present invention provides a wireless terminal for receiving a disaster alert message in a wireless network that transmits a call message indicating whether or not the broadcast of the disaster alert message to the various terminals, in order to reduce terminal battery waste. When the monitored call message is transmitted, and the monitored call message instructs the broadcasting of the disaster alert message, the terminal receives a downlink shared channel to receive the disaster alert message, and if the monitored call message is When not instructing the broadcast of the disaster alert message, the terminal does not receive the downlink shared channel to receive the disaster alert message. The disaster alert message is an Earthquake and Tsunami Warning System (ETWS) message transmitted through a CBS (Cell Broadcast Service) system, and the disaster alert message is a primary alert notification / notification / notification (Primary ETWS Notification) and a second alert notification. Rem / Notification / Notification (Secondary ETWS Notification) may be divided, the terminal after receiving the first alarm notification / notification / notification for the first time, may receive a second alarm notification / notification / notification, the monitoring process The UE may monitor the downlink shared channel according to a call DRX cycle for receiving a call message. That is, the terminal that wants to receive the disaster alert message monitors the call message. When the monitored call message indicates the broadcast of the disaster alert message, the terminal proceeds to receive the downlink shared channel for receiving the disaster alert message, and monitors the call. If the message does not instruct the broadcast of the disaster alert message, it may not proceed to receive the downlink shared channel for receiving the disaster alert message. In addition, the terminal receiving the disaster alarm message monitors the system information through the BCCH, if the system information includes the disaster alarm message broadcast-related information, the process of receiving a disaster alarm message continues, and the system information broadcasts the disaster alarm message If you do not include the relevant information, you may stop receiving the disaster alert message.

The above-mentioned system information may be divided into the number of Master Information Block (MIB) and System Information Blocks (SIB). The MIB contains limitedly the most important and most frequently transmitted parameters for obtaining other information from a cell, and the MIB is transmitted on a BCH channel. SIBs other than SIB type 1 may be carried in a System Information (SI) message, and SIBs mapped to the SI message may be freely configured by scheduling information included in the SIB type 1. The SI messages are sent periodically in windows (eg SI-windows) that are wholesale of their time of occurrence. The UE (terminal) obtains detailed time wholesaler scheduling (also other information, eg frequency wholesaler scheduling, transmission format used) from SI-RNTI reconstruction on PDCCH. One SI-RNTI is used to address not only the SIB type 1 but all other SI messages. The SIB type 1 configures a transmission length for the SI-window length and the SI message. SIB type 10 includes a first ETWS primary notification, and SIB type 11 includes a second ETWS secondary notification. In more detail, the fields included in the SIB type 10 and the SIB type 11 may include parameters or values indicating the cause and type of an ETWS notification, conversion of the ETWS notification, alert type of the ETWS notification, security information of the ETWS notification, The number of segments of the ETWS warning message segment may be included.

An object of the present invention is to transmit call information (or message) to a UE (terminal) in an RRC dormant state (RRC_IDLE mode) or to a UE (terminal) or RRC_CONNECTED mode in an RRC dormant state (RRC_IDLE mode). The UE is informed of a change in system information, a first ETWS primary notification, a second ETWS secondary notification, and the like. The call information is provided to upper tiers. The E-UTRAN may initiate the calling process by sending the call message when a call of the UE occurs. The E-UTRAN also indicates a change in system information or provides an ETWS notification in the call message. That is, if present, the first ETWS primary notification and the second ETWS secondary notification may be included in certain fields in the paging message.

Hereinafter, a terminal according to the present invention will be described.

The terminal according to the present invention includes all types of terminals that can use a service that can exchange data with each other over the air. That is, the terminal according to the present invention is a mobile communication terminal capable of using a wireless communication service (for example, user equipment (UE), mobile phone, cellular phone, DMB phone, DVB-H phone, PDA phone, and PTT phone, etc.) It is a comprehensive meaning including laptops, laptops, laptops, digital TVs, GPS navigation, handheld game consoles, MP3s, and other consumer electronics.

The terminal according to the present invention may include a basic hardware configuration (transmitter / receiver, processor or controller, storage, etc.) required to perform functions and operations for efficient system information reception illustrated in the present invention.

The method according to the invention described thus far can be implemented in software, hardware, or a combination thereof. For example, the method according to the present invention may be stored in a storage medium (eg, internal memory of a mobile terminal or base station, flash memory, hard disk, etc.) and may be stored in a processor (eg, mobile terminal or base station). Code or instructions within a software program that can be executed by an internal microprocessor).

In the above, the present invention has been described with reference to the embodiments shown in the drawings, which are merely exemplary and will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. . Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

1 is a network structure of an E-UTRAN (Evolved Universal Terrestrial Radio Access Network) which is a mobile communication system to which the present invention and the present invention are applied.

2 is a structure of a radio interface protocol between a UE and a UTRAN (UMTS Terrestrial Radio Access Network) based on the 3GPP radio access network standard.

3 is an exemplary view showing a control channel transmission of the prior art.

4 is an exemplary diagram illustrating a network structure for cell broadcast service in UTRAN.

5 is an exemplary view illustrating a method for transmitting an earthquake and tsunami warning system (ETWS) message according to the present invention.

Claims (6)

A method of receiving a warning message on a wireless communication system, Receiving a paging message from a network, the paging message comprising information related to the alert message; And Receiving the alert message on a downlink channel in accordance with the information. The method of claim 1, wherein the alert message is an Earthquake and Tsunami Warning System (ETWS) message. 2. The method of claim 1, wherein the call message is received via a paging control channel (PCCH). 3. The method of claim 2, wherein the paging message comprises a first ETWS notification and a second ETWS notification. 5. The method of claim 4, wherein said first ETWS notification is received prior to receipt of said second ETWS notification. The method of claim 1, wherein the downlink channel is a downlink shared channel (DL-SCH).

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