KR101535183B1 - Apparatus and method for providing an emergency service in a wireless communication system - Google Patents

Abstract

The present invention relates to an apparatus and method for providing an emergency service in a wireless communication system, and more particularly, to a method and apparatus for providing emergency service in a wireless communication system, the method comprising: allocating a connection ID (CID) used for transmission of an emergency service message; The method comprising the steps of: determining a Convergence Sublayer (CS) type; generating a DCD message including at least one of the assigned CID and the determined CS type; and transmitting the generated Downlink Channel Descriptor (DCD) To the mobile station.

Emergency service message, Broadcast Control Pointer IE, idle mode, sleep mode

Description

TECHNICAL FIELD [0001] The present invention relates to an emergency service providing apparatus and a method for providing an emergency service in a wireless communication system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication system, and more particularly, to an emergency service providing apparatus and method.

The next generation communication system is being developed to provide various high-speed and high-capacity services to mobile stations (MSs). Typical examples of the next generation communication system include Institute of Electrical and Electronics Engineers (IEEE) 802.16 communication system and Mobile Worldwide interoperability for Microwave Access (Mobile WiMAX) communication system. Here, the mobile WiMAX communication system is a communication system based on the IEEE 802.16 communication system, and the IEEE 802.16 communication system represents a communication system using the IEEE 802.16 standard.

Hereinafter, an emergency service proposed in the IEEE 802.16 communication system will be described.

Generally, an emergency service includes a Wireless Emergency Rescue Service (hereinafter referred to as 'WERS') and a Wireless Emergency Alert Service (hereinafter referred to as 'WEAS'), and the WERS and WEAS The following will be described. First, the WERS includes a service for supporting a secure structure by recognizing the location of the terminal in case of an emergency such as fire, crime or the like in case of an emergency, and the WERS includes a voice call service such as 911 service . Herein, the WERS is generally referred to as an MS-triggered emergency service since it is triggered by a terminal. Next, the WEAS includes a service for supporting emergency notification such as storm warning, imminent earthquake and tsunami warning to a terminal located in a specific geographical location. Generally, the WEAS is triggered by a base station (BS) It is also called an emergency service (BS-triggered Emergency Service).

The IEEE 802.16 communication system considers only providing the WEAS. The present invention provides a method and system for providing a broadcast control pointer information element (hereinafter, referred to as " Broadcast Control Information Element ") included in a downlink map (DL- Quot; Pointer IE ") message to the terminal, it is possible to broadcast information on the time point of transmitting the emergency service message to the terminal. In this case, when a UE existing in an idle mode or a sleep mode is unavailable to a base station, the Broadcast Control Pointer IE message is negotiated between the UE and the BS in advance The base station is used to broadcast an uplink channel descriptor (UCD), a downlink channel descriptor (DCD) message, a MOB_NBR-ADV (MOBILE Neighbor Advertisement) message, and a transmission time point of an emergency service message. Upon receiving the Broadcast Control Pointer IE message, the UE wakes-up at a corresponding point in time indicated by the Broadcast Control Pointer IE message or recovers a service with the base station and transmits the UCD and DCD messages and the MOB_NBR- Emergency service messages can be received.

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The operation of the idle mode terminal in the conventional IEEE 802.16 communication system will be described below. First, in the IEEE 802.16 communication system, an idle mode UE receives a mobile paging advertisement (MOB_PAG-ADV) from a base station in a paging listening interval of a predetermined paging cycle ) Message. Here, the MOB_PAG-ADV message is a message transmitted from the base station to the idle mode terminal in order to control the idle mode terminal to perform a network entry operation or a location update operation. For example, when downlink data to be transmitted to the idle mode terminal occurs, the BS wakes-up the idle mode terminal using the MOB_PAG-ADV message for downlink data transmission, To perform an operation or to perform a position update operation. Here, the start time of the paging listening interval of each of the idle mode UEs may differ according to the paging period and the paging offset of each of the idle mode UEs.

Meanwhile, since the emergency service message must be received by both the sleep mode terminal, the general operation terminal, and the idle mode terminal as described above, it is possible to consider a situation in which the emergency service message is broadcast only once. Therefore, in order to receive the emergency service message, the idle mode terminal must wake up in the idle mode and wait for the emergency service message reception at the time of transmitting the emergency service message at the base station. However, as described above, when there are a plurality of idle mode terminals, the start time of the paging listening interval of each of the plurality of terminals may be different. Therefore, in order to inform the idle mode terminals waking up at different time points of the transmission time of the urgent service message broadcasted once, the Broadcast Control Pointer IE message must be transmitted for the number of start times of the different paging listening interval. However, since the Broadcast Control Pointer IE message includes a plurality of fields, transmission of the Broadcast Control Pointer IE message may result in resource waste.

In addition, the BS may not transmit the emergency service message at the time of transmitting the emergency service message informed to the idle mode terminal through the Broadcast Control Pointer IE message. For example, as a result of performing the scheduling operation of the BS, the emergency service message may be transmitted at an emergency service message transmission time point indicated in the Broadcast Control Pointer IE message, that is, in a previous frame after the emergency service message transmission frame have. In this case, the idle mode terminal waking up corresponding to the emergency service message transmission time indicated in the Broadcast Control Pointer IE message can not receive the emergency service message in the corresponding frame. However, at present, the IEEE 802.16e communication system does not provide any operation method for the case where the idle mode terminal does not receive the emergency service message at the time of transmitting the emergency service message shown in the Broadcast Control Pointer IE message.

As described above, in the general IEEE 802.16 communication system, only the operation for broadcasting the information about the point of time of transmitting the emergency service message using the Broadcast Control Pointer IE message is provided to provide the emergency service. That is, the IEEE 802.16 communication system does not consider a specific method for providing an emergency service other than the use of the Broadcast Control Pointer IE message. Accordingly, a specific method for providing emergency services in the IEEE 802.16 communication system is required.

An object of the present invention is to provide an emergency service providing apparatus and method in a wireless communication system.

Another object of the present invention is to provide a wireless communication system in which a base station transmits a Connection ID (CID) to be used for transmission of an Emergency Service message and a Emergency Service message The present invention provides an apparatus and method for informing a terminal of information on a Convergence Sublayer (CS) and for receiving and processing the emergency service message using the information.
It is another object of the present invention to provide a method and apparatus for transmitting an Emergency Service message to a UE operating in an idle mode and a sleep mode using an Extended Broadcast Control Pointer IE message in a wireless communication system, The present invention provides an apparatus and method for notifying an information on a waiting time and receiving an emergency message by waking up at a transmission time point of the emergency service message by using the idle mode and the sleep mode operation and waiting for a waiting time.

It is still another object of the present invention to provide a method and apparatus for transmitting an emergency service message through an MBS (Multicast and Broadcast Service) region is added to the MS to notify the MS whether there is an emergency service message in the MBS region, thereby preventing the MS from attempting to decode the MBS-MAP message every frame.

According to an aspect of the present invention, there is provided a method for transmitting an emergency service message of a base station in a wireless communication system, the method comprising: allocating a Connection ID (CID) used for transmission of an emergency service message; Generating a DCD message including at least one of the assigned CID and the determined CS type, determining a Convergence Sublayer (CS) type for processing an emergency service message, And transmitting a Downlink Channel Descriptor (DCD) message to the UE.

According to an aspect of the present invention, there is provided a method for receiving an emergency service message in a wireless communication system, the method comprising: receiving a Connection ID (CID) used for transmission of an emergency service message; Receiving a DCP (Downlink Channel Descriptor) message including at least one of information on a type of a Convergence Sublayer (CS) to be processed, and receiving, when an emergency service message including the CID is received, And processing the emergency service message through the CS.
In order to achieve the above object, according to an embodiment of the present invention, an emergency service message transmission apparatus of a base station in a wireless communication system allocates a Connection ID (CID) used for transmission of an emergency service message, A MAC control message generator for generating a DCD (Downlink Channel Descriptor) message including at least one of the allocated CID and the determined CS type information after determining a Convergence Sublayer (CS) type for processing a message, And a transmitter for transmitting the generated DCD message to the terminal.
According to an aspect of the present invention, there is provided an apparatus for receiving an emergency service message in a wireless communication system, the apparatus comprising: a receiver for receiving a signal; a physical layer decoding unit for decoding the received signal, A physical layer decoder for analyzing a header of the MAC PDU and providing the payload to a MAC control message interpreter when the payload of the MAC PDU includes control information, A MAC PDU decoder for providing the payload to a receive data queue when the payload includes traffic, and a MAC PDU decoder for analyzing a DCD (Downlink Channel Descriptor) message from the MAC PDU decoder, (CID) of the emergency service message and the type of the Convergence Sublayer (CS) to process the emergency service message, Also it characterized in that it comprises a and a MAC control message analyzer for acquiring a received data queue for providing the emergency service message from the MAC PDU decoder to a corresponding CS.

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In the wireless communication system, a base station transmits a Connection ID (CID) to be used for transmission of an emergency service message using a DCD message and a Connection Identifier (CID) to be used for processing the emergency service message when the emergency service message is transmitted Convergence Sublayer (CS) information to the MS, and by using the MS to receive and process the MS message, it is possible to provide an emergency service in a communication system, in particular, an IEEE 802.16 communication system, There is an advantage that performance can be improved.
In the wireless communication system, a base station defines a new Extended Broadcast Control Pointer (IE) message to indicate a transmission time point of an emergency service message to an MS in an idle mode and a sleep mode, The MSs in the idle mode and the sleep mode operation wake up at the transmission time point of the emergency service message and wait for the waiting time to receive the emergency message. Thus, in the Broadcast Control Pointer IE message, There is an advantage that power consumption and wireless resources can be prevented from being wasted due to transmission of a plurality of Broadcast Control Pointer IE messages by shortening the frame offset that can be indicated as a transmission time point of a message to a maximum of 127 frames.
Finally, in the wireless communication system, when a base station desires to transmit an emergency service message through a multicast and broadcast service (MBS) region, the MBS_MAP_IE is set to a parameter (Existence of Emergency Serve Message in MBS region ) To the MS so as to prevent the MS from attempting to decode the MBS-MAP message every frame by notifying the MS whether or not there is an emergency service message in the MBS zone.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The present invention proposes an apparatus and method for providing emergency services in a wireless communication system. Hereinafter, an apparatus and method for providing an emergency service using the IEEE 802.16 communication system will be described. However, the present invention is applicable to other communication systems capable of providing emergency services as well as the IEEE 802.16 communication system .

1 is a diagram illustrating a format of an emergency service message in a wireless communication system according to an embodiment of the present invention. Currently, there is no mention in the IEEE 802.16e system in which format the emergency service message is transmitted and in what way. However, all Medium Access Control (MAC) messages transmitted in the IEEE 802.16 system are in the form of MAC PDUs (Protocol Data Units), and since the emergency service messages belong to the MAC message category, they are naturally MAC PDUs. Therefore, the emergency service message according to the embodiment of the present invention also takes the form of a MAC PDU as shown in FIG.

1, in the emergency service message, a Generic MAC Header field 100 is added to a payload field 130, and a Cyclic Redundancy Checking (CRC) field 160 is added to the payload field 130 .

Here, the general-purpose MAC header field 100 includes a Header Type (HT) field 111 for indicating a header type, an encryption field for indicating whether the payload field 130 is encrypted, A Type field 115 for indicating the type of a subheader included in the emergency service message, an Encryption Control (EC) field 113 for determining whether the emergency service message includes an extended sub- An Extended Subheader Field (ESF) 117 for indicating whether the emergency service message includes the CRC field 160, a CRC Indicator (CI) field 119 for indicating whether the emergency service message includes the CRC field 160, An index of an Traffic Encryption Key (TEK) used for encrypting the payload field 130 and an Encryption Key Sequence (CKE) for indicating an initial vector, A Reserved (Rev) field 123, a length (LEN) field 125 for indicating the length of the emergency service message, an emergency service message A connection identification information (CID) field 127 for indicating a connection ID (CID) included in the general MAC header field 100, a header error check code used for detecting an error in the general- And a Header Check Sequence (HCS) field 129 for the header.

Herein, the length (LEN) field 125 for indicating the length of the emergency service message includes a LEN MSB field and a LEN LSB field, And the value described in the LEN LSB field indicates the length of the emergency service message. Similarly, the CID field 127 includes a CID MSB field and a CID LSB field, and a combination of the CID MSB field and the CID LSB field indicates a CID included in the emergency service message. In the present invention, since the emergency service message is a message to be received by all mobile stations, the value of the CID field 127 is described as a broadcast CID. Here, the numbers in parentheses in each of the HT field 111 to the HCS field 129 indicate the number of bits that implement the corresponding field. For example, since (1) is written in parentheses in the HT field 111, the HT field 111 is implemented with 1 bit.

In addition, the payload field 130 includes an Emergency Message Body field of the emergency service message.

On the other hand, the CID field 127 may differ from system to system. In other words, the CID used for the emergency service message transmission may be different for each service provider or the base station operating the base stations, or some of the CIDs useful for each base station may be allocated for the emergency service. In this case, the BS must indicate to which CID the emergency service message is transmitted. To this end, the present invention proposes an emergency service CID TLV encoding as shown in Table 1 below.

Name Type (1 byte) Length Value (Variable Length) PHY Scope Emergency Service CID XX 2 The CID in which the Emergency Service message is transmitted.
Default CID: 0x #### All

The emergency service CID TLV encoding as shown in Table 1 is included in the DCD message broadcasted to the terminals belonging to the base station. If the emergency service CID TLV encoding is not included in the DCD message, the UEs in the base station regard the default CID (0x ####) as being used for the emergency service message transmission. Alternatively, the emergency service CID TLV encoding may include a MAC management message, for example, an SS Basic Capability-ReSPonse (SBC-RSP) message or a REG-RSP message used during message negotiation during a network entry process, And may be transmitted from the base station to the mobile station through an RSP (REGistration RSsPonse) message. Accordingly, after receiving the DCD message or negotiating the message during the network entry process, the UE recognizes the CID used for the emergency service message transmission. When the BS transmits the MAC PDU including the CID, It is assumed that the MAC SDU (Service Data Unit) in the MAC PDU includes the emergency service message. If it is determined that the MAC message received from the base station is an emergency service message, the MS does not process the emergency service message in the MAC layer, but transmits the emergency service message to the upper layer, .

Alternatively, an emergency service CID of a fixed value may be defined and used instead of the emergency service CID TLV encoding shown in Table 1 above. In this case, it is possible to prevent an overhead that may be caused by including the CID in a message to be periodically transmitted, such as a DCD message, or in a MAC management message negotiated during a network entry process.

Meanwhile, the types of emergency services may be various, and each emergency service message can be transmitted through different CIDs. Therefore, the base station needs to notify the terminal of each CID used for transmission of a plurality of emergency service messages. In this case, in order to notify the UEs of a plurality of CIDs, the Length field of Table 1 is, for example, a value obtained by multiplying the number of CIDs used in the emergency service and the length of one CID (i.e., 2) Length data is entered into the Value field. At this time, the value field of Table 1 may be modified so that the CIDs used for the emergency service are successively included.

On the other hand, when the emergency service message is too large for one MAC PDU or the amount of available resources in the frame is small, one emergency service message can be divided into a plurality of MAC PDUs and transmitted. In the IEEE 802.16 system, when data received from an upper layer is divided into a plurality of MAC PDUs to be transmitted, a fragmentation subheader as shown in Table 2 below is used.

Syntax Size (bit) Notes Fragmentation Subheader () { - -   FC 2 Indicates the fragmentation state of the payload
00 = No fragmentation
01 = Last fragment
10 = First fragment
11 = Continuing (middle) fragment ... ... ...

As shown in Table 2, the fragmentation subheader includes a FC (Fragment Count) field and other conventional fields. Here, if the FC field is '00', the data of the upper layer is transmitted through one MAC PDU. In this case, it is generally not necessary to use the presentation subheader. On the other hand, when other values are taken, it means that the upper layer data is divided into a plurality of MAC SDUs, that is, fragments, and each MAC SDU is mapped to each MAC PDU and transmitted. To distinguish the divided MAC SDUs of the higher layer data, the fragmentation subheader is transmitted together with the MAC SDU (i.e., fragment). At this time, FC = 10 is used for the first MAC SDU of the upper layer data, FC = 11 is used for the middle MAC SDUs, and FC = 01 is used for the last MAC SDU.

On the other hand, in the case of a normal operation terminal, even if the emergency service message is fragmented as described above, there is no problem in receiving the emergency service message. However, in the case of an idle mode or a sleep mode terminal, information on a time point at which the emergency service message is to be transmitted, that is, a time point at which the terminal wakes up, is required and can be informed to the terminal through a Broadcast Control Pointer IE. In other words, during a Paging Listening Interval during which the UE is awake and during a Listening Window during which the UE is awake to the sleep mode UE, the BS transmits to the idle mode UE the Broadcast Control Pointer IE. The terminal receiving the emergency service message can recognize the time when the emergency service message is to be transmitted, and can receive the emergency service message by waking up from the frame at the corresponding time point.

However, this informs only the time when the emergency service message is transmitted, and there is no information about how many urgent service messages the terminal should receive and how long it should wait to receive. Therefore, both of the following cases should be considered.

First, as described above, one emergency service message may be fragmented and composed of several MAC PDUs. In this case, the UE operating in the sleep mode or the idle mode wakes up from the corresponding frame indicated by the Broadcast Control Pointer IE and waits for the MAC PDU including the emergency service message. If the received MAC PDU includes a configuration subheader as well as a MAC SDU, the UE can recognize that the corresponding emergency service message has been fragmented. In this case, the MS must remain awake until all the MAC PDUs constituting one emergency service message are received. When the MS has completed receiving all the MAC PDUs, the MS in the sleep mode is awake, If the UE is present in the awake Paging Listening Interval, the UE performs an operation to be performed within the listening window or the Paging Listening Interval. On the contrary, if the time point at which reception of all of the MAC PDUs is completed is outside the listening window of the sleep mode or the paging listening interval of the idle mode, the UE returns to the idle mode or the sleep mode.

Next, the base station schedules a plurality of emergency service messages at a similar time, and a plurality of emergency service messages can be transmitted to the mobile station. In this case, since the sleep mode and the idle mode UE wake up from the frame indicated by the Broadcast Control Pointer IE and wait for the emergency service message, the BS may not know how many emergency service messages are to be transmitted consecutively. It is possible to return to the idle mode or the sleep mode. In order to prevent this, a format of a Broadcast Control Pointer IE message as shown in Table 3 below is proposed.

Syntax Size (bit) Notes Broadcast_Control_Pointer_IE () { - -  Extended DIUC 4 Broadcast_Control_Pointer_IE () = 0x0A  Length 4 Length in bytes  DCD_UCD Transmission Frame 7 The most significant bits of the frame number are the least significant bits of the next DCD and / or UCD transmission.  Skip Broadcast_System_Update One -  If (Skip Broadcast_System_Update == 0) { - -   Broadcast_System_Update_Type One Shows the type of Broadcast_System_Update
0: For MOB_NBR-ADV Update
1: For Emergency Services Message   Broadcast_System_Update_Transmission _Frame 7 The least significant bits of the frame number of the next Broadcast_System_Update transmission.   Number of Emergency Servie Messages 8 Valid only when Broadcast_System_Update_Type = 1.
Indicates the number of Emergency Service Message to be transmitted from DCD_UCD Transmission Frame  } - } -

Here, the Extended DIUC (Downlink Interval Usage Code) indicates a code used for distinguishing the IE message included in the DL-MAP message, and the codes used for classifying the Broadcast Control Pointer IE message are as shown in Table 3 Likewise, it is '0x0A'. The Length indicates the length of the Broadcast Control Pointer IE message, the DCD (Downlink Channel Descriptor) UCD transmission frame is used to indicate a frame to which a next DCD message and a UCD message will be transmitted, And the MSB (Most Significant Bits) 7 bits among the 9 least significant bits (LSB) of the frame number to which the UCD message is to be transmitted, and describes the value as the value of the DCD_UCD transmission frame. At this time, corresponding broadcast messages (i.e., DCD message and UCD message) are transmitted within four frames from the frame indicated by the DCD_UCD transmission frame. The Skip Broadcast_System_Update may be used to indicate whether the MOB_NBR-ADV message or the emergency service message is to be transmitted using the Broadcast Control Pointer IE message. The Skip Broadcast_System_Update is used to indicate whether or not the transmission time information of the emergency service message is omitted. If the value of Broadcast_System_Update is '0', for example, the Skip Broadcast_System_Update indicates that the MOB_NBR-ADV message or the transmission time information of the emergency service message is not omitted. If the transmission time information of the MOB_NBR-ADV message or the emergency service message is not omitted, a Broadcast_System_Update_Type indicating which message is transmitted among the MOB_NBR-ADV message and an emergency service message and a Broadcast_System_Update_Transmission_Frame indicating a transmission time of the transmitted message . Here, if the value of the Broadcast_System_Update_Type is set to '0', it indicates that the MOB_NBR-ADV message is transmitted, and when the value of the Broadcast_System_Update_Type is set to '1', it indicates that the emergency service message is transmitted. At this time, the Broadcast_System_Update_Transmission_Frame indicates the LSB of the frame number to which the corresponding message corresponding to the Broadcast_System_Update_Type value is to be transmitted. In addition, the Number of Emergency Service Messages added according to an embodiment of the present invention means the number of emergency service messages to be awakened and received in a frame indicated by Broadcast_System_Update_Transmission_Frame in the idle mode or the sleep mode. Here, if the time when the reception of all the emergency service messages is completed within the listening window of the sleep mode or the paging listening interval of the idle mode, the terminal performs an operation to be performed within the listening window or the paging listening interval. On the contrary, if the time when the reception of all the emergency service messages by the number is completed is outside the listening window of the sleep mode or the paging listening interval of the idle mode, the UE returns to the idle mode or the sleep mode. On the other hand, if the channel state is bad, the UE may not receive all the messages transmitted by the BS. In this case, the terminal continues to wait to receive all the emergency service messages by the number of the emergency service messages. Therefore, in order to prevent this, the terminal has to go back to the idle mode or the sleep mode according to the above-mentioned operation after a predetermined time has elapsed. At this time, the waiting time can be obtained through the number of times of emergency waiting messages (the predetermined value) X emergency service messages.

It goes without saying that the above two cases can occur at the same time. That is, all or some emergency service messages may be fragmented while a plurality of emergency service messages are transmitted during a period of waiting for receiving the emergency service message.

Meanwhile, in the IEEE 802.16 system, there is a Multicast and Broadcast Service (MBS) standard capable of providing multicast and broadcast to a plurality of mobile terminals. Unlike the conventional unicast service, the MBS transmits the same broadcast contents at the same time at the same time, and the receiving terminal combines and uses the packets received from the plurality of base stations, Performance can be improved, and this effect is referred to as a macro diversity gain.
Hereinafter, a downlink frame structure for providing the MBS in a general broadband wireless communication system will be described. To support macro diversity, a plurality of base stations define a partial area of a frame as an MBS area and transmit MBS data bursts through the MBS area. Here, the location of the MBS area is transmitted through a downlink MAP (DL-MAP) message. The DL-MAP message includes an MBS_MAP_IE, and the MBS_MAP_IE includes location information of an MBS-MAP message including allocation information of the MBS data bursts. Accordingly, the UE confirms the location of the MBS-MAP message through the DL-MAP message, identifies the location of the MBS area, the location of each of the MBS data bursts in the MBS area, By confirming the information, the MBS data bursts can be received. The emergency service message may be transmitted using the MBS. In this case, the emergency service message transmitted through the MBS region is transmitted using a multicast connection ID (MCID) .

This means that, when the base station informs the CID used for the emergency service through the DCD message, if the MCID is included in the CID, the base station can transmit the emergency service message through the MBS area instead of the general area. Therefore, if the MCID is included in the CID, the UE must decode the MBS-MAP message as well as the DL-MAP message every frame to check whether the emergency service message is transmitted through the MBS area. If it is determined that the MBS-MAP message is decoded and a burst containing the MCID is transmitted, the UE decodes the MBS burst in the MBS area and extracts and receives the emergency service message.

However, since the emergency service message is not frequently transmitted, it is not desirable to perform MBS-MAP message decoding every time. In other words, in the above situation, since the MS does not know whether the emergency service message will be transmitted, the MS attempts to decode the MBS-MAP message every frame. However, since the emergency service message is not transmitted every frame, . This results in additional power consumption of the terminal and waste of processing resources. Therefore, when an emergency service message is transmitted through the MBS area, the BS must transmit a Broadcast Control Pointer IE including a time point at which the emergency service message is to be transmitted. At this time, Only the MBS-MAP message can be decoded and the emergency service message can be received. That is, for the remaining frames excluding the frame indicated by the Broadcast Control Pointer IE, it is not necessary to decode the MBS-MAP message in case of a waking terminal.

In addition, as a method for avoiding decoding of an unnecessary MBS-MAP message by the UE, a new parameter in the MBS_MAP_IE, that is, an Existence of Emergency Serve Message in the MBS region, . ≪ / RTI > When the UE receives the MBS-MAP IE included in the DL-MAP message, it checks the existence of the emergency service message in the MBS zone, It means that the MS decodes the MBS-MAP message to determine the location / size of the emergency service message.

Syntax size (bits) Notes MBS_MAP_IE () { Extended DIUC 4 MBS_MAP = 0x0A ... ... ... Macro diversity enhanced One 0 = Non Macro diversity enhanced zone
1 = Macro diversity enhanced zone If (Macro diversity enhanced = 1) { Existence of Emergency Service Message in MBS region One 0: Indicates no existence of Emergency Service Message in a MBS region
1: Indicates existence of Emergency Service Message in the MBS region Reserved 3 ... ... ... }
Here, the macro diversity enhanced indicates whether an MBS area exists in the DL area.

Meanwhile, in the embodiment of the present invention, the BS informs the MS of a CID (Connection Identifier) used for transmitting the emergency service message, and transmits the CID to the MS in the idle mode and the sleep mode using the Broadcast Control Pointer IE message. The method of notifying the information on the transmission time of the emergency service message and the number of the emergency service messages has been described. However, when the base station does not use the Broadcast Control Pointer IE and the idle mode sleeping interval or sleep mode is awake The emergency service message may be transmitted according to the listening window interval. In this case, if the base station is to transmit a plurality of emergency service messages, the base station must schedule all emergency service messages to be transmitted before the paging listening interval or the listening window interval ends.

On the other hand, in the Broadcast Control Pointer IE message of Table 3, the frame offset that can be indicated by Broadcast_System_Update_Transmission_Frame is a maximum of 127 frames, and the time during which the idle mode terminal can maintain the idle mode, that is, the paging cycle, 16 bits or 65535 frames. The sleep mode terminal can also have 1024 frames at the time when the sleep mode can be maintained, that is, the maximum value of the sleep window. As a result, when the base station informs the receiving time of the emergency service message through the Paging Listening Interval of the terminal or the Broadcast Control Pointer IE message during the listening window, in the worst case, in the sleep mode for the transmission of the emergency service message, 8, and in the idle mode, a maximum of 516 Broadcast Control Pointer IEs must be transmitted. For example, if a base station attempts to transmit an emergency service message after 127 frames to an idle mode terminal (paging cycle is 5000 frames) awake during a Paging Listening Interval, it sends an emergency service message transmission timing (after 127 frames) to the corresponding terminal Ali sends a Broadcast Control Pointer IE message. After receiving the emergency service message, the terminal wakes up after 127 frames after transition to the idle mode at the end of the paging listening interval, and waits for an emergency service message. At this time, the base station again transmits the same Broadcast Control Pointer IE, and the terminal wakes up after 127 frames after transition to the idle mode again after receiving it, and repeats the above operation. As a result, the idle terminal wakes up after the last 127 frames after receiving 10 Broadcast Control Pointer IEs and receives the emergency service message. This causes waste of wireless resources in terms of power consumption. Therefore, it is necessary to define a new Broadcast Control Pointer IE message that can accommodate the paging cycle of the idle mode terminal and the listening window of the sleep mode terminal at one time.

For this, the format of the Extended Broadcast Control Pointer IE message as shown in Table 5 below is proposed.

Syntax Size (bit) Notes Extended_Broadcast_Control_Pointer_IE () { - -  Extended DIUC 4 Broadcast_Control_Pointer_IE () = 0x0E  Type 2 00: Emergency Service Message
01 ~ 11: Reserved  Number of Emergency Servie Messages 2 Valid only when Type = 00.
Indicates the number of Emergency Service Messages to be transmitted from the DCD_UCD Transmission Frame  Transmission Frame 16 Least significant 16 bits of frame number in which Emergency message is broadcasted  Frame Duration Indicates the period during which an MS in Idle Mode or Sleep Mode shall keep awake to receive emergency service message (s). The value '0' indicates the only Transmission Frame. Its unit is frame. } -

Here, the Extended DIUC (Downlink Interval Usage Code) indicates a code used for distinguishing the IE message included in the DL-MAP message, and the code used for classifying the Broadcast Control Pointer IE message is '0x0E'. The Type indicates a message type to be transmitted in a frame indicated by the Transmission Frame field, and the Number of Emergency Service Message indicates the number of emergency service messages to be transmitted from the time point indicated by the following Transmission Frame field. The Transmission Frame is used to indicate when a message of the type indicated by the Type is to be transmitted and takes 16 bits of LSB (Least Significant Bits) out of 24 bits indicating a frame number to be transmitted, . The Frame Duration indicates a time required for the UE to wake up at a point indicated by the Transmission Frame field and wait for receiving emergency service messages. After this time, it is necessary to return to the idle mode or the sleep mode again according to the above-mentioned operation.

Herein, when using the Extended Broadcast Control Pointer IE message of Table 5, it is possible to cover both the paging cycle of the idle mode terminal and the sleep mode of the sleep mode through one Extended Broadcast Control Pointer IE message.

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Meanwhile, in the above embodiment, the CID to be used for the emergency service message is included in the DCD message in the form of one TLV, and is transmitted to the terminal. However, the CID-outside information may be needed. That is, information on the priority of the CID non-emergency service message and the Convergence Sublayer (CS) to process the emergency service message when the emergency service message is transmitted may be further required for each emergency service message, And may further include the CID-related information in the DCD message. As can be seen, the emergency service messages can be configured differently, and the information on a plurality of emergency service messages can be included in the DCD message and transmitted. For example, if the base station uses four emergency services, four emergency service compound TLVs are included in the DCD message for transmission, and each emergency service set TLV is different from the parameter for the other emergency service set TLV Lt; RTI ID = 0.0 > TLV < / RTI >

Here, the format of the DCD message includes the Emergency Service Compound TLV as shown in Table 6 below.

Name Type (1 byte) Length Value (Variable Length) PHY Scope Emergency Service 63 The Emergency Service is a compound TLV that defines the parameters required for Emergency Service. Multiple instances may be included in DCD message. But, only one Emergency Service compound TLV shall be included in the DCD message for a specific priority.

As shown in Table 6, the emergency service set TLV corresponding to the type of the emergency service message transmitted by the base station can be included in the DCD message. Herein, the emergency service set TLV may include parameters as shown in Table 7 below.

Name Size (1 byte) Length Value (Variable Length) CID for Emergency Service 63.1 2 Multicast CID used for DL Emergency Service.
Emergency Service message shall be transmitted on this connections Information for Emergency Service 63.2 One If this TLV is omitted, the MS shall consider the Emergency Service message on the CID specified by the CID for the Emergency Service (ie Type = 63.1).

Bit # 0-3 Indicates the priority of the emergency service message that is transmitted on the connection.
Lower value has higher priority. That is, the priority 0 is the highest priority (default) and the priority 7 is the lowest priority

Bit # 4-7 indicates CS type which is used for Emergency Service.

0. GPCS
1. Packet, IPv4 (default)
2. Packet, IPv6
3. Packet, IEEE802.3 / Ethernet
4. Packet, IPv4 over IEEE 802.3 / Ethernet
5. Packet, IPv6 over IEEE 802.3 / Ethernet
7. ATM
8-15: Reserved

Here, the CID for Emergency Service refers to a CID of a connection through which a corresponding emergency service message is transmitted. The Information for Emergency Service indicates the priority and the CS type of the corresponding emergency service message. The terminal also has its own priority, and the priority of the terminal is set to a value operated by the operator. If there is an emergency service message having a higher priority (lower value) than its own priority, the terminal must receive the emergency service message. If there is an emergency service message having a lower priority (higher value) than the emergency service message, the terminal does not receive the emergency service message or can ignore the emergency service message. Here, the CS type indicates a CS layer for processing an MAC PDU including a corresponding emergency service message.

Meanwhile, the format of the Extended Broadcast Control Pointer IE message described in the embodiment may be configured as shown in Table 8 below.

Syntax Size (bit) Notes Extended Broadcast_Control_Pointer_IE () { - -  Extended DIUC 4 Extended Broadcast_Control_Pointer_IE () = 0x0E  Type 4 Indicates the type of message.

0x0: Emergency Service Message
0x1 to 0xF: Reserved  Transmission Frame Offset 16 A relative value from the current frame number in which a BS will start to transmit Emergency Service Message. '0' means the current frame in which this MAP IE is transmitted.  Transmission Duration 8 Indicates the period during which an MS in Idle Mode or Sleep Mode shall keep awake to receive emergency service message (s). The value '0' indicates that the MS keeps awake during only the Transmission Frame. Its unit is frame.  if (Type == 0x0) { -   Transmission of ESM with priority 8 Indicates which ESM with specific priority will be transmitted in the frame specified by TransmissionFrameOffset

Bit # 0: if set to 1, ESM with the priority 0 will be transmitted.
Bit # 1: if set to 1, ESM with the priority 1 will be transmitted.
Bit # 2: if set to 1, ESM with the priority 2 will be transmitted.
Bit # 3: if set to 1, ESM with the priority 3 will be transmitted.
Bit # 4: if set to 1, ESM with the priority 4 will be transmitted.
Bit # 5: if set to 1, ESM with the priority 5 will be transmitted.
Bit # 6: if set to 1, ESM with the priority 6 will be transmitted.
Bit # 7: if set to 1, ESM with the priority 7 will be transmitted.   While (the bit in Transmission of ESM with priority == 1) -   { -    Counter for the ESM 8 This field is used to prevent MSs from unnecessarily decoding the ESMs retransmitted by BS.   } -  } - } - -

The base station can repeatedly transmit the same emergency service message several times so that all terminals can fully understand the urgent situation (since the terminal can not receive the emergency service message). In this case, the UE may receive the same emergency service message several times. In order to avoid such a case, the base station includes a Counter for the ESM in the Extended Broadcast Control Pointer IE message of Table 8 . Here, the Counter for the ESM denotes a transmission number of the emergency service message, and has different values for each emergency service message. When the base station completes the repetitive transmission of the same emergency service message and then attempts to transmit a new emergency service message, the Counter for the ESM at the time of transmission of the previous emergency service message increases by 1 and transmits the same. If the Counter for the ESM stores a Counter for the ESM and a Counter for the ESM having a value different from that stored in the Counter for the ESM is received, this means transmission of a new Emergency Service message, And then stores a new Counter for the ESM. Accordingly, if the base station repeatedly transmits the same emergency service message several times, the Counter for the ESM of the emergency service message repeatedly received will be the same as the counter for the ESM stored in the terminal, And if the Counter for the ESM is received different from the stored value, the UE can recognize that a new Emergency Service message is received.

Also, in Table 8, the Transmission of ESM with Priority indicates a priority of an emergency service message to be transmitted during a transmission duration in a frame indicated by the Extended Broadcast Control Pointer IE. As described above, the MS must receive an emergency service message having a priority higher than its own priority, and may not receive an emergency service message having a priority lower than its own priority. If only the emergency service message having a priority lower than the priority of the UE itself is to be transmitted, the UE may ignore all emergency service messages to be transmitted and not receive the emergency service messages. However, since it is possible to receive it in future, it is necessary to update the Counter for the ESM for the emergency service message even in the case of the emergency service message having a low priority.

Herein, the Extended Broadcast Control Pointer IE message is used to inform the idle mode and the sleep mode UE of the transmission time point of the emergency service message, and to receive the selective emergency service message and retransmit the emergency service message , It MUST be included in the DL MAP message before transmission.
2 is a flowchart illustrating a procedure of a method for receiving an emergency service message of a UE operating in an idle mode and a sleep mode in a wireless communication system according to an embodiment of the present invention.
Referring to FIG. 2, in step 201, It checks whether a Broadcast Control Pointer IE message as shown in Table 3 is received. Here, instead of the Broadcast Control Pointer IE message, <Table 5> or An Extended Broadcast Control Pointer IE message as shown in Table 8 may be used. Herein, the Broadcast Control Pointer IE message or the Extended Broadcast Control Pointer IE message is received through a DL-MAP message.
When the Broadcast Control Pointer IE message is received, the UE uses the received Broadcast Control Pointer IE message in step 203 to transmit information on the emergency service message transmission time, the number of emergency service messages, and the frame duration (Frame Duration) I understand. Herein, the terminal receives the Broadcast Control Pointer IE message during a Paging Listening Interval period in the case of an idle mode terminal and during a listening window period in the case of a sleep mode terminal, Mode. Here, the frame period refers to a period of time that the MS waits to receive an emergency service message at the time of transmitting the emergency service message. The terminal In the case of receiving the Broadcast Control Pointer IE message of Table 3, the frame period basically calculates the number of X emergency service messages (waiting time) to wait (calculated value) <Table 5> or Upon receiving the Extended Broadcast Control Pointer IE message as shown in Table 8, information on the frame period can be extracted and grasped in the Extended Broadcast Control Pointer IE message.
In step 205, the MS determines whether the current frame is a frame at the time of transmitting the emergency service message, using information on the detected emergency service message transmission time point. The step 205 is repeated until the current frame becomes the frame of the emergency service message transmission time point.
If the current frame is the frame at the time of transmitting the emergency service message, the MS changes the mode of the MS from the idle mode or the sleep mode to the normal operation mode in step 207, and operates the timer according to the detected frame period , It is checked in step 209 whether the timer has expired. When the timer expires in step 209, the MS proceeds to step 223 and returns the mode of the MS to the idle mode or the sleep mode.
On the other hand, if the timer has not expired in step 209, the MS determines whether there is an MAC PDU including an emergency service message in the corresponding frame in step 211. In other words, it is checked whether or not a MAC PDU including the emergency service CID exists in the frame. If the MCID is used as the emergency service CID, since the emergency service message may be transmitted through the MBS region, the UE receives the MBS_MAP IE through the DL-MAP message and sets the field of the received MBS_MAP IE , And when the setting of the field indicates that there is an emergency service message to be transmitted through the MBS area, the MBS-MAP message should also be decoded. Here, the field indicates whether there is an emergency service message to be transmitted through the MBS area. The UE can acquire MBS burst allocation information through decoding of the MBS MAP message, and can receive the emergency service message by decoding the MBS burst in the MBS area using the obtained allocation information. At this time, the MBS burst includes a pre-assigned MCID for transmission of an emergency service message. Thus, the UE can receive the emergency service message through the general area or the MBS area. Here, the Emergency Service CID may use a Fixed Emergency Service CID, Upon receiving the emergency service CID TLV encoding of Table 1, Can be obtained by receiving the emergency service set TLV in Table 7. At this time, Emergency service CID TLV encoding in Table 1 The emergency service set TLV in Table 7 is included in the MAC management message used in the message negotiation during the DCD message or network entry process and is transmitted to the UE. The DCD message may further include not only a CID used for transmission of the emergency service message but also a type of a CS to process the emergency service message and a priority of the emergency service message, The MS can process the received emergency service message through the corresponding CS. If the DCD message does not include information on the type of the CS to process the emergency service message, the UE can process the received emergency service message through the default CS.
In step 211, if there is no MAC PDU including an emergency service message in the corresponding frame, the MS returns to step 209 and repeats the following steps. On the other hand, if there is an MAC PDU including an emergency service message in the corresponding frame in step 211, the MS generates a fragment of the emergency service message (MAC SDU) in the MAC PDU in step 213, It is checked whether or not there is a fragmentation sub-header for the header. Here, the fragmentation subheader may include: Can be configured as shown in Table 2 below.
In step 213, when there is a fragment of the emergency service message in the MAC PDU and a fragmentation subheader for the fragment exists, the terminal extracts a corresponding emergency service message from the MAC PDU in step 215, After the extracted emergency service message is transmitted to the upper layer, it is checked in step 217 whether the corresponding fragment is the last fragment. Here, whether or not the fragment is the last fragment can be identified using the fragmentation subheader. When the fragment is the last fragment, the terminal proceeds to step 219, If the segment is not the last fragment, the UE recognizes that there is a fragment not yet received for the emergency service message, and returns to step 209 to repeat the following steps. On the other hand, if it is determined in step 213 that there is no fragmentation of the emergency service message in the MAC PDU and the fragmentation subheader for the fragment does not exist, that is, only the non-fragmented emergency service message exists , The MS proceeds to step 225 and extracts the corresponding emergency service message from the MAC PDU, and transmits the extracted emergency service message to the upper layer, and then proceeds to step 219.
Thereafter, in step 219, the UE first deducts the number of the emergency service messages and, in step 221, checks whether the number of the emergency service messages is 0 or not. When the number of the emergency service messages is 0, the MS determines that all the emergency service messages have been received. In step 223, the MS returns to the idle mode or the sleep mode. More specifically, if the time at which the emergency service message is completely received or the time at which the timer expires is present in the listening window of the sleep mode or in the idle mode paging listening interval, the terminal performs in the listening window or the paging listening interval If the time at which the emergency service message is completely received or the time at which the timer expires is outside the listening window of the sleep mode or the paging listening interval of the idle mode, Mode. On the other hand, if the number of the emergency service messages is not 0, the terminal determines that an emergency service message that has not yet been received in the corresponding frame exists, and returns to step 209 to repeat the following steps.
Thereafter, the terminal terminates the algorithm according to the present invention.
3 is a flowchart illustrating a method of transmitting an emergency service message of a base station in a wireless communication system according to an embodiment of the present invention.
Referring to FIG. 3, in step 301, the BS determines whether an emergency service message to be transmitted to the UE is generated. When the emergency service message is generated, the BS performs scheduling for the transmission of the emergency service message in step 303. For example, when the emergency service message is transmitted and when the terminal determines the emergency service message In step 305, a Broadcast Control Pointer IE message including information on the time of transmission of the emergency service message, the number of emergency service messages, and a frame period is generated, send. Here, the Broadcast Control Pointer IE message includes May be configured as shown in Table 3. Instead of the Broadcast Control Pointer IE message, <Table 5> or An Extended Broadcast Control Pointer IE message as shown in Table 8 may be used. If, If the information on the frame period is omitted, such as the Broadcast Control Pointer IE message of Table 3, the UE calculates the number of X Emergency Services messages to be basically awaited (predetermined value) . Herein, the Broadcast Control Pointer IE message or the Extended Broadcast Control Pointer IE message is transmitted through a DL-MAP message. Here, the Broadcast Control Pointer IE message is transmitted to the corresponding terminal during a listening window interval in the case of a paging listening interval or a sleep mode terminal when the mobile terminal is an idle mode terminal.
In step 307, the BS determines whether the current frame is the frame of the emergency service frame transmission time point. Here, the step 307 is repeated until the current frame becomes the frame at the time of transmitting the emergency service message. If the current frame is the frame at the time of transmitting the emergency service message, the BS transmits the emergency service message to the corresponding MS in step 309.
Thereafter, the base station terminates the algorithm according to the present invention.
If the emergency service message is generated in step 301, the BS may transmit the emergency service message directly to the AT or may transmit the emergency service message in the future. FIG. 3 illustrates the case of transmitting the emergency service message in the future. In the case of transmitting the emergency service message through the MBS area, even when transmitting the emergency service message, a Broadcast Control Pointer IE should be transmitted. Or directly transmit the MBS_MAP_IE instead of the Broadcast Control Pointer IE.
3, the BS allocates a CID to be used for transmission of an emergency service message, determines a CS type for processing the emergency service message, and transmits the allocated CID and the CID, And transmits the DCD message including at least one of information on the determined CS type to the UE. Here, when the CS type for processing the emergency service message is determined to be the default CS type, the BS may include only the allocated CID in the DCD message. In addition, the BS may further include information on the priority of the emergency service message.
In addition, although not shown, when transmitting the emergency service message of FIG. 3 through the MBS area, the BS determines whether there is an emergency service message to be transmitted through the MBS area, and according to the determination, And transmits a DL-MAP message including the MBS_MAP IE with the field set to the UE. Here, the field indicates whether there is an emergency service message to be transmitted through the MBS area. At this time, the emergency service message includes a pre-assigned MCID for transmission of an emergency service message.
4 is a block diagram illustrating the structure of a base station transmitting apparatus in a wireless communication system according to an embodiment of the present invention.
As shown in the figure, the base station includes a MAC payload encoder 401, a MAC PDU encoder 402, a physical layer encoder 403, and an RF transmitter 404.
Referring to FIG. 4, the MAC payload encoder 401 includes a transmission data queue 411 and a MAC control message generator 414. Here, the transmission data queue 411 stores data from an upper layer and outputs data to be transmitted to the corresponding frame to the MAC PDU encoder 402 according to scheduling. In particular, according to the embodiment of the present invention, the transmission data queue 411 outputs one or a plurality of emergency service messages to be transmitted to the corresponding frame according to the scheduling to the MAC PDU encoder 402. Here, the one or a plurality of emergency service messages may be fragmented and output to the MAC PDU encoder 402. [ The MAC control message generator 414 generates a MAC control message and outputs the MAC control message to the MAC PDU encoder 402. Here, the MAC control message may include a DL-MAP message, a DCD message, a MAC management message, and the like, including information on data to be transmitted in the corresponding frame according to the scheduling. According to the present invention, the DL-MAP message includes A Broadcast Control Pointer IE message as shown in Table 3, <Table 5> or The Broadcast Control Pointer IE message or the Extended Broadcast Control Pointer IE message includes an Extended Broadcast Control Pointer IE message as shown in Table 8. The Broadcast Control Pointer IE message or the Extended Broadcast Control Pointer IE message includes the transmission time of the emergency service message, For this purpose, the MAC control message generator 414 may determine a time at which the emergency service message is transmitted and a time at which the terminal waits to receive the emergency service message at the determined time. The DCD message or MAC management message includes Emergency service CID TLV encoding such as <Table 1> The MAC control message generator 414 may assign a CID to be used for transmission of an emergency service message and determine a CS type for processing the emergency service message . In addition, the MAC control message generator 414 determines whether there is an emergency service message to be transmitted through the MBS area, sets a field in the MBS_MAP IE according to the determination, As shown in Table 4, a DL-MAP message including the MBS_MAP IE with the field set can be generated. Here, the field indicates whether there is an emergency service message to be transmitted through the MBS area.
The MAC PDU encoder 402 includes a MAC header generator 412, a MAC CRC generator 413, and a MAC payload generator 415. The MAC PDU encoder 402 generates a payload with the data from the MAC payload encoder 401, adds a header and a CRC to the generated payload to generate a MAC PDU, To the physical layer encoder 403. Specifically, the MAC payload generator 415 generates a payload using data (traffic) from the MAC payload encoder 401 or a MAC control message. If a fragment of the emergency service message is input from the MAC payload encoder 401, the MAC payload generator 415 generates As shown in Table 2, a fragmentation subheader for the fragment is generated, and a payload including a fragment of the corresponding emergency service message and a fragmentation subheader is generated. The MAC header generator 412 generates a header for the generated payload, and adds the generated header to the payload. Here, if the generated payload is a payload generated using the emergency service message, the header includes information on the CID 127 of the emergency service message as shown in FIG. The MAC CRC generator 413 generates a CRC code for the generated payload and appends the generated CRC code to the payload. In this manner, a header and a CRC code are added to the payload and output.
The physical layer encoder 403 encodes the MAC PDUs from the MAC PDU encoder 402 and outputs the encoded data. Here, the physical layer encoder 403 may include a channel code block, a modulation block, and the like. Assuming an OFDM system, the channel code block is composed of a channel encoder, an interleaver, a modulator, and the like, and the modulation block is an IFFT for carrying transmission data on a plurality of orthogonal subcarriers. (Inverse Fast Fourier Transform) calculator, and the like.
The RF transmitter 404 converts a baseband digital signal from the physical layer encoder 403 into a baseband analog signal, converts the baseband analog signal into an RF signal, and transmits the RF signal through an antenna.
5 is a block diagram illustrating a configuration of a reception apparatus of a terminal in a wireless communication system according to an embodiment of the present invention.
As shown in the figure, the UE includes an RF receiver 501, a physical layer decoder 502, a MAC PDU decoder 503, a MAC payload decoder 504, and an operation mode changing unit 505.
Referring to FIG. 5, the RF receiver 501 converts an RF signal received through an antenna into a baseband analog signal, converts the baseband analog signal to a baseband digital signal, and outputs the baseband analog signal.
The physical layer decoder 502 performs physical layer decoding of the baseband digital signal from the RF receiver 501 and outputs original information data to the MAC PDU decoder 503. [ The physical layer decoder 502 may include a demodulation block, a channel decoding block, and the like. Assuming OFDM system, the demodulation block is composed of a fast Fourier transform (FFT) operator for extracting data on each subcarrier, and the channel decoding block includes a demodulator, a deinterleaver, a channel decoder a channel decoder, and the like.
The MAC PDU decoder 503 includes a MAC header analyzer 513, a MAC CRC checker 512 and a MAC payload detector 511. The MAC PDU decoder 503 detects a header in an MAC PDU from the physical layer decoder 502 And the CRC is checked and output. Specifically, the MAC header analyzer 513 analyzes the header of the MAC PDU and determines whether the payload of the corresponding MAC PDU includes control information or traffic. If the payload of the MAC PDU includes control information, To the MAC payload decoder 504. That is, if the payload of the MAC PDU includes control information, the payload of the MAC PDU is provided to the MAC control message interpreter 514 of the MAC payload decoder 504. If the payload of the MAC PDU includes control information, The payload is loaded into the receive data queue 515. In particular, according to the embodiment of the present invention, the MAC header analyzer 513 of the idle mode or the sleep mode terminal wakes up in the frame of the emergency service message transmission time according to the control of the operation mode changing unit 505, Checks whether the CID of the emergency service message is included in the header, and outputs the result of the check to the operation mode change unit 505. Also. The MAC CRC checker 512 separates the CRC code from the MAC PDU received from the physical layer decoder 502, generates a CRC code with the payload of the MAC PDU, and outputs the generated CRC code and the separated CRC code Check whether the code matches or not. At this time, the MAC CRC checker 512 controls the MAC payload detector 511 so that a payload of an MAC PDU without errors is provided to the payload decoder 504. The MAC payload detector 511 detects the payload in the MAC PDU received from the physical layer decoder 502 and provides the payload to the MAC payload decoder 504. [ Particularly, according to the embodiment of the present invention, the MAC payload detector 511 of the idle mode or sleep mode terminal wakes up in the frame of the emergency service message transmission time according to the control of the operation mode changing unit 505, Detects a payload in an MAC PDU including a CID for an emergency service message in a header of the received MAC PDU, outputs the detected payload to the MAC payload decoder 504, And outputs it to the operation mode changing section 505. Here, the detected payload may be composed of one or a plurality of emergency service messages, wherein if all or some emergency service messages among the one or more emergency service messages are fragmented, The load may include a fragment of the corresponding emergency service message and a fragmentation subheader for the fragment.
The MAC payload decoder 504 includes a MAC control message interpreter 514 and a receive data queue 515. Here, the MAC control message interpreter 514 analyzes a MAC control message, for example, a DL-MAP message, a DCD message, and a MAC management message from the MAC PDU decoder 503. According to the present invention, the DL-MAP message includes A Broadcast Control Pointer IE message as shown in Table 3, <Table 5> or The MAC control message interpreter 514 analyzes the Broadcast Control Pointer IE message or the Extended Broadcast Control Pointer IE message to determine whether the emergency service message And outputs information on the transmission time, the number of emergency service messages, and the frame period to the operation mode changing unit 505. Also, when an emergency service message is transmitted through the MBS area, the DL-MAP message includes As shown in Table 4, the MAC control message interpreter 514 may include the MBS_MAP IE having a field indicating whether an emergency service message to be transmitted through the MBS area exists, MAP, and confirms the setting of the field in the MBS_MAP IE in the DL-MAP message. When the field indicates that an emergency service message to be transmitted through the MBS area exists, the MBS-MAP message is received and decoded can do. Through decoding of the MBS MAP message, the MAC control message interpreter 514 can obtain MBS burst allocation information, and outputs the obtained allocation information to the operation mode changing unit 505. [ At this time, the MBS burst includes a pre-assigned MCID for transmission of an emergency service message. Also, the DCD message or the MAC management message Emergency service CID TLV encoding such as <Table 1> The MAC control message interpreter 514 interprets the emergency service CID TLV encoding or the emergency service set TLV and transmits the emergency service set TLV to the CID for the emergency service message To the operation mode changing unit 505. The operation mode changing unit 505 switches the operation mode to the operation mode changing unit 505. In addition, the MAC control message interpreter 514 may interpret the emergency service set TLV to obtain information on a type of a CS to process the emergency service message, To the data queue 515. The receive data queue 515 buffers the received data from the MAC PDU decoder 503 and provides the buffered data to an upper layer. In particular, an emergency service message from the MAC PDU decoder 503 is provided to an upper layer. Here, the upper layer may be determined according to information on a type of a CS to process the emergency service message.
The operation mode change unit 505 receives the transmission time point of the emergency service message from the MAC control message interpreter 514, the number of emergency service messages, the frame period, and information on the CID of the emergency service message, Changes the mode of the idle mode or the sleep mode terminal to the normal operation mode in the frame at the time of message transmission and controls the MAC PDU decoder 503 to wake up and receive the MAC PDU from the base station. At this time, the operation mode changing unit 505 operates the timer according to the frame period together with the mode change. The operation mode change unit 505 controls the MAC PDU decoder 503 so that the MAC PDU decoder 503 notifies the MAC PDU decoder 503 of the MAC PDUs including the emergency service messages among the MAC PDUs received until the timer expires That is, the MAC PDU including the CID of the emergency service message is present. If there is an MAC PDU including the emergency service message, the emergency service message is extracted and transmitted to the upper layer. At this time, one or a plurality of emergency service messages may be received during the corresponding frame period, and all or some emergency service messages among the one or a plurality of emergency service messages may be fragmented and received. In this case, The mode changing unit 505 maintains the mode of the UE in a normal mode until all MAC PDUs constituting one or a plurality of emergency service messages are received. If the time at which all the corresponding MAC PDUs are received or the time at which the timer expires is present in the listening window of the sleep mode or the paging listening interval of the idle mode, the operation mode changing unit 505 performs the operation within the listening window or the paging listening interval The MAC PDU decoder 503 is controlled to perform an operation to be performed. On the other hand, if the time when the corresponding MAC PDU is received or when the timer expires is outside the listening window of the sleep mode or the paging listening interval of the idle mode , And controls the MAC PDU decoder 503 to return to the idle mode or the sleep mode. The operation mode changing unit 505 receives the MBS burst allocation information from the MAC control message interpreter 514 and instructs the MAC PDU decoder 503 to allocate MBS bursts And extracts the emergency service message.
Meanwhile, although the timer according to the present invention is set to a value according to a frame period, it may be set to a fixed value in another embodiment, or may be set as a product of a unit time frame and a number of emergency service messages, The timer may not be set.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various modifications within the scope of the invention. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

1 is a diagram illustrating a format of an emergency service message in a wireless communication system according to an embodiment of the present invention;

FIG. 2 is a flowchart illustrating a procedure of a method for receiving an emergency service message of a terminal operating in an idle mode and a sleep mode in a wireless communication system according to an embodiment of the present invention;

3 is a flowchart illustrating a procedure of a method for transmitting an emergency service message in a base station in a wireless communication system according to an embodiment of the present invention.

FIG. 4 is a block diagram showing the configuration of a base station transmitting apparatus in a wireless communication system according to an embodiment of the present invention, and FIG.

FIG. 5 is a block diagram showing a configuration of a reception apparatus of a terminal in a wireless communication system according to an embodiment of the present invention; FIG.

Claims (48)

A method of transmitting an emergency service message of a base station in a wireless communication system, Allocating a connection ID (CID) used for transmission of an emergency service message; Determining a Convergence Sublayer (CS) type for processing the emergency service message; Generating a DCD message including at least one of the allocated CID and the determined CS type information; And transmitting the generated Downlink Channel Descriptor (DCD) message to the UE. The method according to claim 1, When the CS type for processing the emergency service message is determined to be a default CS type, the generated DCD message includes only the allocated CID. The method according to claim 1, Wherein the DCD message further includes information on a priority of the emergency service message. The method according to claim 1, And transmitting the emergency service message including the allocated CID to the MS. The method according to claim 1, Determining a time point at which the emergency service message is to be transmitted; Determining a time to wait for the MS to receive an emergency service message at the determined time; Generating a Broadcast Control Pointer IE including information on a time point at which the emergency service message is transmitted and a waiting time to receive the emergency service message; (DL-MAP) message including the generated Broadcast Control Pointer IE to the mobile station. 6. The method of claim 5, Wherein the Broadcast Control Pointer IE further includes information on a type of a message to be transmitted at the determined time point. 6. The method of claim 5, And transmitting the emergency service message to the terminal at the determined time point. The method according to claim 1, Determining whether there is an emergency service message to be transmitted through a multicast and broadcast service (MBS) area; Setting a field in the MBS_MAP IE according to the determination; (DL-MAP) message including an MBS_MAP IE with the field set to the UE, Wherein the field is a field indicating whether an emergency service message to be transmitted through the MBS area exists. 9. The method of claim 8, And transmitting an emergency service message to the MS through the MBS zone. 10. The method of claim 9, Wherein the emergency service message comprises a multicast connection identifier (MCID) pre-allocated for transmission of an emergency service message. A method for receiving an emergency service message of a terminal in a wireless communication system, A Downlink Channel Descriptor (DCD) including at least one of a connection ID (CID) used for transmission of an emergency service message and information about a type of a Convergence Sublayer (CS) ) Message from a base station, And processing the received emergency service message through the CS when the emergency service message including the CID is received. 12. The method of claim 11, And if the DCD message does not include information on the type of CS to process the emergency service message, the received emergency service message is processed through a default CS. 12. The method of claim 11, Wherein the DCD message further includes information on a priority of the emergency service message. 12. The method of claim 11, Receiving a Broadcast Control Pointer IE from the BS through a DL-MAP (Downlink-MAP) message; Obtaining information on a time at which the emergency service message is transmitted using the received Broadcast Control Pointer IE and a time at which the terminal waits to receive the emergency service message at the time point; Further comprising the step of receiving an emergency service message from the base station during the waiting time when the emergency service message is transmitted. 15. The method of claim 14, Wherein the Broadcast Control Pointer IE further includes information on a type of a message to be transmitted at the time point. 12. The method of claim 11, Receiving an MBS_MAP IE from the BS through a DL-MAP (Downlink-MAP) message; Confirming a setting of a field in the received MBS_MAP IE; and a field indicating whether an emergency service message to be transmitted through a Multicast and Broadcast Service (MBS) area exists, Further comprising the step of decoding the MBS MAP message when the setting of the field indicates that there is an emergency service message to be transmitted through the MBS area. 17. The method of claim 16, Acquiring allocation information of a corresponding MBS burst through decoding of the MBS MAP message; Decoding the MBS burst in the MBS region using the obtained allocation information, and receiving an emergency service message from the base station. 18. The method of claim 17, Wherein the MBS burst comprises a pre-assigned MCID for transmission of an emergency service message. An apparatus for transmitting an emergency service message of a base station in a wireless communication system, (CID) to be used for transmission of an emergency service message, determines a Convergence Sublayer (CS) type for processing the emergency service message, and then transmits the allocated CID and the determined CS type A MAC control message generator for generating a DCD (Downlink Channel Descriptor) message including at least one of information on the MAC address, And a transmitter for transmitting the generated DCD message to the terminal. 20. The method of claim 19, Further comprising a transmit data queue for generating the emergency service message, Wherein the transmitter transmits an emergency service message including the allocated CID to the terminal. 20. The method of claim 19, The MAC control message generator determines a time at which the emergency service message is to be transmitted, determines a time for the MS to wait for receiving the emergency service message at the determined time, Generates a Broadcast Control Pointer IE including information on a waiting time for receiving a message, generates a DL-MAP (Downlink-MAP) message including the generated Broadcast Control Pointer IE, Wherein the transmitter transmits the generated DL-MAP message to the terminal, and transmits the emergency service message to the terminal at the determined time. 22. The method of claim 21, Wherein the Broadcast Control Pointer IE further includes information on a type of a message to be transmitted at the determined time point. 20. The method of claim 19, The MAC control message generator determines whether there is an emergency service message to be transmitted through the MBS area, sets a field in the MBS_MAP IE according to the determination, and the field indicates whether there is an emergency service message to be transmitted through the MBS area And generates a DL-MAP message including the MBS_MAP IE in which the field is set, Wherein the transmitter transmits the generated DL-MAP message to a terminal and transmits an emergency service message to the terminal through the MBS area. An apparatus for receiving an emergency service message of a terminal in a wireless communication system, A receiver for receiving a signal transmitted from the base station, A physical layer decoder for performing physical layer decoding on the received signal to provide a MAC PDU (Medium Access Control Protocol Data Unit) If the payload of the MAC PDU includes control information, the payload of the MAC PDU is provided to the MAC control message interpreter, and if the payload of the MAC PDU includes traffic, A MAC PDU decoder for providing a load to a receive data queue, (CID) used for transmission of an emergency service message and a Convergence Sublayer (CS) for processing the emergency service message by analyzing a Downlink Channel Descriptor (DCD) message from the MAC PDU decoder, A MAC control message parser for obtaining at least one of information on the type of the MAC control message, And a receive data queue for providing an emergency service message from the MAC PDU decoder to a corresponding CS. 25. The method of claim 24, The MAC control message interpreter interprets a Broadcast Control Pointer IE in a DL-MAP (Downlink-MAP) message from the MAC PDU decoder to determine when the emergency service message is transmitted, Acquiring information on a time to wait for reception, Wherein the MAC PDU decoder provides the emergency service message received during the waiting time to the received data queue at the time the emergency service message is transmitted. 26. The method of claim 25, Wherein the Broadcast Control Pointer IE further includes information on a type of a message to be transmitted at the time point. 25. The method of claim 24, The MAC control message interpreter verifies the setting of a field in the MBS_MAP IE included in the DL-MAP message from the MAC PDU decoder, and determines whether the setting of the field is a Multicast and Broadcast Service (MBS) ) Area, the BS acquires the MBS burst allocation information through decoding of the MBS MAP message. The field indicates whether there is an emergency service message to be transmitted through the MBS area Lt; / RTI &gt; Wherein the MAC PDU decoder extracts the emergency service message by decoding the MBS burst in the MBS area using the obtained allocation information, and provides the extracted emergency service message to the received data queue. delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete

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