KR100800862B1 - Method for transmitting and receiving broadcast service using broadcast zone identifier in mobile telecommunication system - Google Patents

Abstract

The present invention relates to a method for providing a broadcast service using a common radio resource in a wireless mobile communication system. In a mobile communication system composed of a plurality of cells provided by the present invention, a method for receiving a broadcast service while a terminal moves between the plurality of cells includes: a terminal receiving a broadcast program from a source cell, which is one of the plurality of cells; And when the mobile station moves to the target cell, receiving broadcast area identification information indicating a broadcast area to which the target cell belongs, and detecting whether the previous broadcast area has been departed according to the broadcast area identification information. Receiving method.

Broadcast service, broadcast area identifier, DL-MAP

Description

Method of transmitting / receiving broadcasting service using broadcasting area identifier in mobile communication system {METHOD FOR TRANSMITTING AND RECEIVING BROADCAST SERVICE USING BROADCAST ZONE IDENTIFIER IN MOBILE TELECOMMUNICATION SYSTEM}

1 is a system structure diagram when all cells provide the same broadcast service.

2 is a system structure diagram when cells provide different broadcast services in a mobile communication system to which the present invention is applied.

3 is a diagram illustrating a structure of a DL-MAP message applied to the present invention.

4 illustrates a general format of the DL_MAP information element.

5 is a diagram illustrating a message format when a broadcast area identifier is included in TD_Zone_IE of a DL_MAP message according to the first embodiment of the present invention.

6 is a diagram illustrating a message format when a broadcast area identifier is included in MBS_Zone_IE of a DL_MAP message according to the first embodiment of the present invention.

7 is a message flow diagram illustrating a switching operation of a broadcast area according to the first embodiment of the present invention.

8 is a flowchart illustrating a broadcast area switching operation of a terminal according to the first embodiment of the present invention.                 

9 is a diagram illustrating a structure of cells having a plurality of broadcast area identifiers according to the second embodiment of the present invention.

10 is a diagram illustrating a message format when a broadcast area identifier list is included in TD_Zone_IE of a DL_MAP message according to the second embodiment of the present invention.

11 is a diagram illustrating a message format when a broadcast area identifier list is included in MBS_Zone_IE of a DL_MAP message according to the second embodiment of the present invention.

12A to 12C are flowcharts illustrating a broadcast area switching operation of a terminal according to the second embodiment of the present invention.

The present invention relates to a method for receiving a broadcast service in a wireless mobile communication system, and more particularly, to a method for providing and receiving a broadcast service using a common radio resource.

The future communication environment is changing rapidly as it transcends the division of wired and wireless areas or the division of regions and countries. In particular, the future communication environment such as IMT-2000 (International Mobile Telecommunication 2000) is a trend that is built as an environment that provides a variety of information in real time and comprehensive as well as video and audio. The development of the mobile communication system is not only performing voice communication in an access terminal (AT) such as a cellular phone or a personal communication system (PCS). It has reached the point where it can watch broadcasting service including voice and sound.

In the case of a broadcast service in a typical mobile communication system, when a terminal knows that broadcasting is supported in a corresponding cell, information for receiving a physical channel from a base station (for example, connection identifier (CID), encryption) Key) and information for receiving a broadcast (for example, a program list, a multicast IP address, a port number), and the like, and then received the broadcast. For this purpose, the same broadcast related information should be obtained regardless of which cell the terminal is present in.

1 illustrates a system structure when all cells provide the same broadcast service. As shown in the figure, each cell covered by an access point (AP) provides the same service, so that the terminal 10 uses only one program information provided from one base station and corresponding physical channel information. To receive broadcast services in all cells.

However, if different local broadcasts are provided in two different areas and broadcast reception information and physical channel information obtained from each area are different from each other, the terminal receiving the broadcast moves beyond the two different areas. The broadcast service of the new area cannot be recognized.

That is, in the conventional mobile communication system, when a broadcast service having a different content is provided with different physical channel information from the original area in a new area, a terminal receiving a specific broadcast channel may know that the broadcast service changes when moving between the areas. Attempt to receive broadcast service continuously with the physical channel information of the previous area. Therefore, in this case, there is a problem in that the terminal becomes impossible to receive a broadcast without knowing that broadcast reception is impossible.

Accordingly, an object of the present invention, which was devised to solve the problems of the prior art operating as described above, is to provide a broadcast provided in a new broadcast area when moving between broadcast areas of a terminal in a service area of a wireless communication system including a plurality of broadcast areas. It is to provide a method and apparatus for notifying the fact that a service changes.

Another object of the present invention is to provide a method and apparatus for receiving a fact that a terminal moving between broadcast areas within a service area of a wireless communication system including a plurality of broadcast areas changes the broadcast service provided in the new broadcast area. .
One embodiment of the present invention created to achieve the above object,

In a mobile communication system composed of a plurality of cells provided by the present invention, a method for receiving a broadcast service while a terminal moves between the plurality of cells includes: a terminal receiving a broadcast program from a source cell, which is one of the plurality of cells; And when the mobile station moves to the target cell, receiving broadcast area identification information indicating a broadcast area to which the target cell belongs, and detecting whether the previous broadcast area has been departed according to the broadcast area identification information. Receiving method.

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Hereinafter, with reference to the accompanying drawings will be described in detail the operating principle of the preferred embodiment of the present invention. In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

In the following description, the present invention provides a broadcast service area by providing a broadcast area identifier (MBS) for each broadcast area in a service area of a wireless communication system including a plurality of broadcast areas. Be aware that this changes. In this specification, two embodiments for assigning broadcast area identifiers to different broadcast areas are presented. The first embodiment assigns one broadcast area identifier to one base station, and the second embodiment distinguishes broadcast areas by a connection identifier (CID) corresponding to a broadcast program to be transmitted.

2 is a diagram illustrating a system structure when cells provide different broadcast services in a mobile communication system to which the present invention is applied. As shown, cells belonging to two broadcast areas marked with different hatching provide different broadcast services, and the two broadcast areas have broadcast area identifiers 1 and 2, respectively. When the terminal 20 moves from the cell A to the cell B, the system notifies the terminal that the broadcast service area has changed, and the terminal, which has recognized this, requests the base station again broadcast information to continue receiving the broadcast.

Hereinafter, embodiments of the present invention will be described by taking an example of a wireless communication system using the Institute for Electrical and Electronics Engineers (IEEE) 802.16 standard. However, embodiments of the present invention are not limited to the system structure illustrated below, and of course, applicable to other systems having a similar technical background.

<< first embodiment >>

The first embodiment of the present invention is to geographically classify broadcast areas, and assigns one broadcast area identifier to one base station. The UE observes a Down-Link Map (DL-MAP) message to identify physical channel configuration information of the cell in which the UE is located. Since the terminal observes all DL-MAP messages sent from the base station, the system includes the broadcast area identifier in the DL-MAP message, so that the terminal can recognize which broadcast area it currently belongs to.

FIG. 3 illustrates a structure of a DL-MAP message applied to the present invention. As illustrated, a DL-MAP message has an 8-bit management message type, a PHY Synchronization Field, and an 8-bit. It consists of a Downlink Channel Descriptor (DCD) Count, a 48-bit Base Station ID, and a PHY Specific Section. The physical layer characteristic part includes n DL-MAP information elements (IEs).

4 shows a general format of the DL_MAP information element. As shown, the DL_MAP information element basically includes a 4-bit Down-link Interval Usage Code (DIUC) indicating what type of information the DL-MAP information element is. In general, the DL_MAP information element may include, in addition to the DIUC, 8 bits of N_CIDs (Number of CIDs), 16 bits of N_CIDs, and 10 bits of Orthogonal Frequency Division Multiple Access (OFDMA) symbol offset. 5 bits of Subchannel Offset, 3 bits of Boosting, 9 bits of OFDMA Numbers of OFDMA Symbols and 5 bits of Number of Subchannels.

The CID is a connection identifier included in a DL_MAP information element and indicates a multicast address or unicast address to which the DL_MAP information element is assigned. The OFDMA symbol offset indicates the position of the OFDMA symbol at which the data burst starts from the start of the downlink frame in which the DL-MAP is transmitted. The subchannel offset starts at 0 as the index of the lowest OFDMA subchannel used to transmit the data burst. Boosting indicates whether the corresponding subcarriers have been power boosted. The number of OFDMA symbols is the number of OFDMA symbols for transmitting the downlink physical channel burst, and the number of subchannels is the number of subchannels having a consecutive index used for transmitting the data burst.

When adding a broadcast area identifier to the DL_MAP information element, the value of the DIUC is set to a predetermined value, for example, 15. If the value of the DIUC is 15, an extended DIUC dependent IE is included after the DIUC. The extended DIUC dependency information element is composed of TD_Zone_IE.                     

FIG. 5 illustrates a case in which a broadcast area identifier is included in TD_Zone_IE of a DL_MAP message according to the first embodiment of the present invention. As shown, TD_Zone_IE includes a 4-bit extended DIUC, a 4-bit length field, and an 8-bit broadcast area identifier (broadcast area identifier). The extended DIUC represents the DIUC of the TD_Zone_IE.

In other cases, a dedicated field MBS_Zone_IE is used for inserting a broadcast area identifier into the extended DIUC dependent information element.

FIG. 6 illustrates a case in which a broadcast area identifier is included in MBS_Zone_IE of a DL_MAP message according to the first embodiment of the present invention. As shown, MBS_Zone_IE includes a 4-bit extended DIUC, a 4-bit length field, and an 8-bit broadcast area identifier (broadcast area identifier). The extended DIUC represents the DIUC of the MBS_Zone_IE.

The terminal receiving the broadcast service detects the broadcast area identifier in TD_Zone_IE () or MBS_Zone_ID () of the DL-MAP message received from the system, and compares the broadcast area identifier with a previously known broadcast area identifier. If the newly received broadcast area identifier is different from the previously known broadcast area identifier, the terminal recognizes that it has entered the new broadcast area and requests the base station for multicast IP address, port number, encryption key, CID, etc. as broadcast related information. . The broadcast related information is received from the base station, and broadcast reception is continued.

7 is a message flow diagram illustrating a broadcast service area switching procedure according to the first embodiment of the present invention.                     

Referring to FIG. 7, the terminal first obtains relevant information for a broadcast program when necessary for broadcast reception in a source cell having a broadcast area identifier of 1. (102) Here, the relevant information for a broadcast program is to be serviced or serviced. It can be a broadcast list. The terminal requests information such as a CID and an encryption key for receiving data (video, sound, text, etc.) of a broadcast program from a source cell through a DSA-REQ (Dynamic Service Addition Request) to the base station. Transmits the multicast IP address of the corresponding program to the base station. After the base station transmits a DSX-RVD (Dynamic Service-x Received) indicating that the request is valid (106) to the terminal (106), the DSA-RSPD (Dynamic Service Addition Response) is an acknowledgment response indicating whether the terminal authenticates or supports QoS (108) The DSA-RSP includes information such as a CID, an encryption key, etc. for receiving a broadcast in the source cell. Then, the terminal transmits a DSA-ACK (Dynamic Service Addition Acknowledge) to the base station in response to the DSA-RSP, and receives the broadcast using the information (110). 112 That is, the terminal receives from the source cell Decode the DL-MAP message to start receiving the physical channel having the CID of the program to be received. The broadcast area identifier value of the source cell included in the DL-MAP message, that is, '1' is stored.

When the terminal moves to the target cell (114), the terminal receives the DL-MAP message from the target cell and interprets TD_Zone_IE or MBS_Zone_IE of the DL-MAP message to check the broadcast area identifier '2' of the target cell. 116) Since the broadcast area identifier '2' of the target cell is different from the previously stored broadcast area identifier '1', the terminal determines that it cannot continuously receive the currently received broadcast and, if necessary, receives new broadcast program related information to the target cell. In this case, if necessary, the terminal switches to an awake state capable of transmitting the request for the new broadcast program reception related information. Thereafter, the terminal transmits a DSA-REQ message to the target cell to inquire whether the broadcast received from the source cell can be provided by the target cell. (120) After receiving the DSX_RVD from the target cell (122) When receiving a DSA_RSP including broadcast reception related information from the target cell (124), it responds with a DSA_ACK (126) and receives a broadcast service in the target cell. (128) Here, the terminal stores the broadcast area identifier '2' again. . If the broadcast received at the source cell is not provided at the target cell, the terminal acquires a list of programs that can be received from the target cell and starts receiving a new broadcast program.

8 is a flowchart illustrating the operation of a terminal according to the first embodiment of the present invention.

Referring to FIG. 8, in step 200, the terminal acquires program information from a base station of a source cell, and in step 202, physical channel information (CID, encryption key, etc.) and a broadcast area corresponding to a broadcast program selected by the user from the base station. Obtain an identifier. In step 204, the broadcast area identifier of the current area is stored, and in step 206, a broadcast service is received in the source cell using the physical channel information.

When the DL-MAP message is received from the base station of the target cell in step 208, the UE determines whether the broadcast area identifier included in the received DL-MAP message is the same as the stored broadcast area identifier in step 210. Return to to continue receiving the broadcast service. On the other hand, if it is not the same, the terminal proceeds to step 212 to store the received broadcast area identifier again and informs the user that the previous broadcast area corresponding to the previously received broadcast program is left in step 214. The notification of the departure may be notified to the user using an alarm method such as a liquid crystal display panel or sound or vibration included in the terminal. In step 216, the terminal attempts to receive the broadcast program in the target cell with the physical channel information used in the source cell. The process of 216 may be additionally performed as necessary. That is, even if a cell is changed for the same broadcast service, the system transmitting the same method as much as possible may perform step 216. Otherwise, the step 216 may be deleted. In the following description, it is assumed that the process 216 is included.

If it fails to receive the broadcast program, in step 218, the UE requests physical channel information for the broadcast program continuously received from the source cell to the base station of the target cell. In step 220, the UE determines whether information indicating that the broadcast program is valid in the target cell and physical channel information for the broadcast program are received using information received in response to the request for the physical channel information from the target cell. do. If the information has been received, the process returns to step 206 to continue receiving the broadcast program using the physical channel information of the broadcast program included in the response message.

On the other hand, if information indicating that the target cell is valid and information on the broadcast program have not been received, the terminal inquires whether the user receives a new broadcast program in step 222. As described above, such an inquiry may be displayed on a liquid crystal display panel using a text message or an icon. If the user wants to receive a new broadcast program, i.e., when a request signal for a new broadcast service is input, the terminal requests information of a necessary broadcast program from a base station of the target cell. Thereafter, the terminal acquires information on a new broadcast program selected by the user from the target cell, and returns to step 200 to receive the new program. If the user does not want to receive the new broadcast program, the broadcast program previously received is terminated in step 224.

<< 2nd Example >>

A second embodiment of the present invention is to distinguish broadcast areas by a connection identifier (CID). The broadcast program transmitted from the base station has its own CID. Accordingly, the second embodiment configures one broadcast area with cells transmitting a program having the same CID. Therefore, a cell transmitting a plurality of programs has a plurality of broadcast area identifiers.

9 illustrates a structure of cells having a plurality of broadcast area identifiers according to the second embodiment of the present invention. As shown, three broadcast areas A, B, and C exist. Each broadcasting area transmits programs having different CID # 1, CID # 2, and CID # 3, and includes four cells. Since cell 1 transmits programs of CID # 1 and CID # 3, it belongs to two broadcast areas A and C. In the case of cell 4, since only the program of CID # 3 is transmitted, it belongs to only one broadcast area C.

Each cell transmits a broadcast area identifier list indicating at least one broadcast area to which it belongs via DL-MAP messages. The terminals in the cells interpret the DL-MAP message to obtain a broadcast area identifier list. The DL-MAP message includes the broadcast area identifier list in TD_Zone_IE or MBS_Zone_IE as in the case of the first embodiment.

FIG. 10 illustrates a case where a broadcast area identifier list is included in TD_Zone_IE of a DL_MAP message according to the second embodiment of the present invention. As shown, TD_Zone_IE includes a 4-bit extended DIUC, a 4-bit length field, an 8-bit broadcast area identifier number (N_MBS_Zone_Identifier), and the number of broadcast area identifiers. The extended DIUC represents the DIUC of the TD_Zone_IE.

FIG. 11 illustrates a case in which a broadcast area identifier list is included in MBS_Zone_IE of a DL_MAP message according to the second embodiment of the present invention. As shown, MBS_Zone_IE includes a 4-bit extended DIUC, a 4-bit length field, and a plurality of broadcast area identifiers. The number of broadcast area identifiers can be known by the length field. The extended DIUC represents the DIUC of the MBS_Zone_IE.

The terminal receiving the broadcast service detects a broadcast area identifier list in TD_Zone_IE () or MBS_Zone_ID () of a DL-MAP message received from the system, and compares the broadcast area identifier with a known broadcast area identifier. If a known broadcast area identifier is not included in the broadcast area identifier list, the terminal recognizes that a new broadcast area has been entered and requests a base station for multicast IP address, port number, encryption key, CID, etc. as broadcast related information. Can be. The broadcast related information is received from the base station, and broadcast reception is continued.

As described above, the base station informs which broadcasting area the current cell belongs to through a DL-MAP message. The mapping information for broadcast areas corresponding to the CIDs is notified through the DSA-RSP message, not the DL-MAP message. When the terminal transmits a DSA-REQ message for requesting a desired broadcast program to the base station, the base station corresponds to the CID and the CID of the requested broadcast program using a DSA-RSP message that is a response to the DSA-REQ message. Notifies the terminal of the mapping information of the broadcast area. Broadcast area identifier information in the DSA-RSP message is configured as shown in Table 1 below.

Type Length Value Scope [145/146]. 29 8 MBS Zone Identifier DSA-RSP

The terminal manages the broadcast area identifier list MY_ZONE_ID_LIST and the entire broadcast area identifier list ZONE_ID_LIST. The MY_ZONE_ID_LIST includes at least one broadcast area identifier corresponding to the CID currently received by the terminal. The ZONE_ID_LIST includes all broadcast area identifiers to which the current cell belongs, that is, all broadcast area identifiers obtained from a DL-MAP message. The management of the lists will be described below.

First, the case in which the terminal leaves the broadcast area to which it belongs will be described.

If the broadcast area identifier corresponding to the CID received by the terminal is not included in the broadcast area identifier list received in the new cell, the terminal removes the broadcast area identifier previously received from MY_ZONE_ID_LIST and ZONE_ID_LIST. In this case, the terminal transmits a DSA-REQ message to the base station of the new cell to check whether a broadcast program corresponding to the received CID is being transmitted to another physical channel, and if the broadcast program is being transmitted to another physical channel, After the corresponding broadcast area identifier of the new cell is added to MY_ZONE_ID_LIST, the broadcast program is continuously received. On the other hand, if the broadcast program is not being transmitted, the terminal receives the broadcast program related information from the base station of the new cell again and informs the user of new programs that can be received.

Next, a case in which the UE has left the broadcast area to which it belongs, but MY_ZONE_LIST is included in the broadcast area identifier list received from the base station of the new cell will be described. In other words, when the terminal is out of the broadcast area for transmitting the program being received, but the received broadcast is also broadcasted from the target cell, the terminal receives ZONE_ID_LIST from the target cell, updates the broadcast area identifier list, and receives the previously received signal. Continue receiving broadcasts. In this case, the terminal may transmit a DSA-REQ message or another request message to obtain other information related to the broadcast.

When the terminal enters a new broadcast area, the terminal accesses a base station of a new cell to receive a broadcast program related information serviced in the corresponding broadcast area according to a user's request, and receives broadcast programs that can be received according to the broadcast program information. Notify If desired, the user starts receiving a new broadcast program.

The example of FIG. 9 mentioned above is demonstrated. The terminal 12 receives the broadcast of CID # 3 in the cell 2. In cell 2, the terminal 12 belongs to the broadcast area C, and the DL-MAP message of the cell 2 includes the broadcast area identifier list {A, C}. When the terminal 12 moves to cell 3, the terminal 12 receives a DL-MAP message including the broadcast area identifier list {B, C}. In this case, since cell 3 still belongs to the broadcast area C, the terminal 12 continuously receives the broadcast of CID # 3 without requesting new broadcast related information. Upon request of the user, the terminal 12 requests broadcast program related information to cell 3 of the broadcast area C and attempts to receive a new broadcast program.

As another example, consider a case in which the terminal 12 receives the broadcast of CID # 1 in cell 2 and then moves to cell 3. Then, the terminal 12 interprets the broadcast area identifier list {B, C} of the cell 3, recognizes that the broadcast of the CID # 1 can no longer be received in the cell 3, and terminates the broadcast reception of the CID # 1. In another case, the terminal 12 transmits a DSA-REQ message to the base station of cell 3 to confirm whether the previously received broadcast program can be continuously received with a different CID. As a result of confirming the received DSA-RSP message in response to the DSA-REQ message, if the cell 3 provides the previously received broadcast program, the terminal 12 updates MY_ZONE_ID_LIST and performs the broadcast program in the cell 3. Receive continuously. On the other hand, if the cell 3 does not provide the broadcast program, the terminal 12 requests broadcast program related information from the cell 3 base station in order to obtain a new broadcast program that can be received according to a user's request.

As another example, consider a case in which the terminal 14 receives the broadcast of CID # 3 from cell 4 of the broadcast area C and moves to cell 2 of the broadcast area A. In this case, since the terminal 14 moves to the new broadcast area A, the terminal 14 requests related information for receiving a broadcast program. At this time, if desired by the user, the terminal 14 continues to receive the broadcast program of CID # 3 already received.

12A to 12C are flowcharts illustrating operations of a terminal according to the second embodiment of the present invention.

Referring to FIG. 12A, in step 302, a terminal acquires broadcast program information from a base station of a source cell, and in step 304, the terminal receives physical channel information (CID and encryption key, etc.) corresponding to a broadcast program selected by a user to a base station. Obtain and obtain a broadcast area identifier. In step 306, the terminal adds the broadcast area identifier to MY_ZONE_ID_LIST and receives the broadcast using the physical channel information in step 308. In this case, ZONE_ID_LIST of the terminal includes broadcast area identifiers corresponding to all broadcast areas to which the source cell belongs.

When the terminal moves from the source cell to an adjacent target cell and a DL-MAP message is received from the base station of the target cell in step 310, the terminal determines that the broadcast area identifier list included in the received DL-MAP message is the ZONE_ID_LIST in step 312. And if it is the same, return to step 308 to continue receiving the broadcast. On the other hand, if it is not the same, the process proceeds to step 314 to determine whether a new broadcast area has been entered or has simply left the existing broadcast area.

In step 314, the UE checks whether MY_ZONE_ID_LIST is included in the received broadcast area identifier list. If not included, the terminal determines that the broadcast area corresponding to the previous broadcast program is received and proceeds to step 332 of FIG. 12B.

Referring to FIG. 12B, in step 332, the UE updates ZONE_ID_LIST with the received broadcast area identifier list and notifies the user that the previous broadcast area has been departed in step 334. The process 334 may be configured to be performed between the processes 336D and 340 described later, or may be configured to be performed between the processes 334 and 336. In step 336, the UE first attempts to receive the broadcast program from the target cell with previous physical channel information used in the source cell, and determines whether the broadcast program has been successfully received from the target cell. If the target cell successfully receives the broadcast program, the terminal returns to step 308 to continue receiving the broadcast program. On the other hand, if the broadcast program cannot be received, the process proceeds to step 340.

In step 340, the terminal removes the broadcast area identifier of the broadcast area corresponding to the physical channel that cannot be received in MY_ZONE_ID_LIST, and in step 342, the base station of the target cell requests physical channel information for receiving the previous broadcast program. In step 344, the terminal determines whether information indicating that the previous broadcast program is valid is received from the base station of the target cell in response to the request. If the previous broadcast program is valid in the target cell, physical channel information for receiving the previous broadcast program is also received in the target cell. If the broadcast program is valid in the target cell, the terminal returns to step 308 and continues receiving the previous broadcast program with the physical channel information of the target cell.

In step 344, if the previous broadcast program is not valid in the target cell, in step 34, the UE inquires of whether to receive a new broadcast program. If the user wants to receive a new broadcast program, the process returns to step 302 to receive broadcast program information and physical channel information from the base station of the target cell and to receive a new broadcast program. Otherwise, the previous broadcast program ends in step 348.

On the other hand, if the MY_ZONE_LIST is included in the received broadcast area identifier list in step 314, the terminal may not enter the previously belonging broadcast area but may enter a new broadcast area or leave a broadcast area that does not belong previously. It is determined that the process proceeds to step 316. Here, the belonging broadcast area means a broadcast area corresponding to a broadcast program received by the terminal, and the non-associated broadcast area means a broadcast program that can be provided by the source cell although the terminal does not receive it. It means a broadcasting area corresponding to.

In step 316, the terminal determines whether the received broadcast area identifier list further includes a broadcast area identifier other than ZONE_ID_LIST. If the received broadcast area identifier list further includes a broadcast area identifier other than ZONE_ID_LIST, EnterZone indicating whether to enter a new broadcast area is set to YES in step 320, otherwise EnterZone is set to NO in step 318. The EnterZone may be set as a flag in a memory provided in the terminal. In operation 322, the terminal determines whether the ZONE_ID_LIST further includes a broadcast area identifier other than the received broadcast area identifier list. If ZONE_ID_LIST further includes a broadcast zone identifier other than the received broadcast zone identifier list, in step 326, ExitZone indicating whether the broadcast zone does not belong previously is set to NO; otherwise, the ExitZone indicates YES in step 324. Is set. The ExitZone may also be set as a flag in a memory provided in the terminal. The EnterZone and ExitZone are determined in FIG. 12C.

If both EnterZone and ExitZone are YES in step 328 of FIG. 12C, it is determined that the previous non-subscribed broadcast area is entered and entered into a new broadcast area, and the process proceeds to step 350. On the other hand, if EnterZone is YES and ExitZone is NO in step 330, it is determined that the user has entered a new broadcasting area and proceeds to step 364. Proceed to step 358.

In step 350, the ZONE_ID_LIST of the terminal is updated with the received broadcast area identifier list, and in step 352, the terminal informs that the user has entered a new broadcast area that provides another broadcast service that has not been previously provided to the user. In step 354, the terminal asks the user whether to receive a new broadcast program available in the new broadcast area. If the user wants to receive a new broadcast program, the terminal returns to step 302. If the user does not want to receive a new broadcast program, the terminal proceeds to step 308. To return. In this case, before returning to step 308, the terminal may report that the broadcast area that has not previously belonged to the base station of the target cell is left in step 356.

In step 358, the ZONE_ID_LIST of the terminal is updated with the received broadcast area identifier list. In step 360, the terminal notifies the user that the broadcast area that has not previously belonged to the user returns to step 308. In this case, before returning to step 308, the UE may report to the base station of the target cell that it has previously left the broadcast area that it does not belong to in step 362.

In step 364, the ZONE_ID_LIST of the terminal is updated with the received broadcast area identifier list, and in step 366, the terminal informs the user that the user has entered a new broadcast area. In step 368, the terminal asks the user whether to receive a new broadcast program available in the new broadcast area. If the user wants to receive a new broadcast program, the terminal returns to step 302. Return to step 308 to continue receiving.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

In the present invention operating as described in detail above, the effects obtained by the representative ones of the disclosed inventions will be briefly described as follows.

The present invention provides a broadcast service different from each other by transmitting at least one broadcast area identifier indicating a broadcast service that can be provided in a region where a terminal is located in a wireless mobile communication system providing a broadcast service to a terminal by including it in a DL-MAP message. When moving between broadcast areas that provide a service, whether or not to continue to receive the broadcast service that has already been received, and if necessary to request the relevant information about the new broadcast service. The present invention improves the user's satisfaction by preventing the broadcast service from being interrupted without the terminal being aware when moving between the broadcast areas.

Claims (19)

In the method for transmitting a broadcast service in a mobile communication system consisting of a plurality of cells, Transmitting broadcast program information related to serviced broadcast programs, broadcast related information and broadcast area identification information necessary for receiving broadcast programs to be provided to a terminal; And transmitting the broadcast service to the terminal. The method of claim 1, wherein the broadcast area identification information, And transmitting information corresponding to each cell. The method of claim 1, wherein the broadcast area identification information, And a broadcast area identifier list including broadcast area identifiers corresponding to broadcast programs serviced in a corresponding cell. The method of claim 3, wherein And transmitting mapping information indicating the broadcast area corresponding to the broadcast program requested by the terminal to the terminal. The method of claim 1, wherein the broadcast related information, A method of transmitting a broadcast service comprising a multicast IP address, a port number, an encryption key and a connection identifier. In the mobile communication system consisting of a plurality of cells, a terminal for receiving a broadcast service while moving between the plurality of cells, Receiving broadcast area identification information indicating a broadcast area to which the target cell belongs when a terminal receiving a broadcast program moves to a target cell from a source cell which is one of the plurality of cells; And detecting whether the previous broadcast area has been departed according to the broadcast area identification information. The method of claim 6, And detecting that the user has left the previous broadcast area when the previous broadcast area has been left as a result of the detection. The method of claim 6, And the system supports the Institute of Electrical and Electronics Engineers (IEEE) 802.16 standard. The method of claim 6, Requesting broadcast program reception related information from the target cell when the previous broadcast area is separated as a result of the detection. The method of claim 9, When the broadcast program reception related information is received from the target cell in response to the request for the broadcast program reception related information, and the broadcast program reception related information means that a previous reception broadcast service is valid, the received broadcast And continuously receiving the broadcast program using program reception related information. The method of claim 9, When the broadcast program reception related information is received from the target cell in response to the request for the broadcast program reception related information, and the broadcast program reception related information means that the previous reception broadcast service is not valid, Asking whether to select a broadcast program, Terminating the broadcast program if a new broadcast program is not selected by the user as a result of the inquiry; As a result of the inquiry, when a new broadcast program is selected by the user, the base station of the target cell requests and acquires physical channel information about the new broadcast program, and the new broadcast program is obtained using the obtained physical channel information. The method of receiving a broadcast service further comprising the step of receiving. The method of claim 6, And receiving the broadcast service from the target cell by using the physical channel information used in the source cell when the previous broadcast area is separated as a result of the detection. How to. The method of claim 6, wherein the broadcast area identification information, And a broadcast area identifier corresponding to the target cell. The method of claim 6, wherein the detecting of the departure from the previous broadcast area comprises: If the broadcast area identifier of the target cell is not the same as the broadcast area identifier of the source cell included in the broadcast area identification information received from the source cell, determining that the previous broadcast area has been departed How to receive it. The method of claim 6, wherein the broadcast area identification information, And a broadcast area identifier list including broadcast area identifiers corresponding to broadcast programs provided by the target cell, respectively. The method of claim 6, wherein the detecting of the departure from the previous broadcast area comprises: A first broadcast area identifier list including a broadcast area identifier corresponding to a broadcast program provided from the source cell, and a second broadcast area identifier list including broadcast area identifiers corresponding to all broadcast programs provided by the source cell. Receiving and storing, The third broadcast region identifier list including all broadcast region identifiers received from the target cell is different from the second broadcast region identifier list, and the third broadcast region identifier list does not include the first broadcast region identifier list. And if it is determined that the previous broadcast area has deviated. The method of claim 16, As a result of the determination, when leaving the previous broadcast area, the second broadcast area identifier list is updated with the third broadcast area identifier list, and the broadcast program is performed in the target cell with the physical channel information in the source cell. Attempting to receive, Receiving the broadcast program as a result of the attempted reception, continuing to receive the broadcast program in the target cell; As a result of the reception, if the broadcast program is not received, the broadcast area identifier corresponding to the broadcast program is deleted from the first broadcast area identifier list, and the physical cell information of the broadcast program is requested to the base station of the target cell. Process, Acquiring the physical channel information from the base station of the target cell by the request of the physical channel information, and further receiving the broadcast program in the target cell using the obtained physical channel information. A method for receiving a broadcast service. The method of claim 17, If the target cell does not provide the broadcast program, inquiring whether a user selects a new broadcast program; Terminating the broadcast program if a new broadcast program is not selected by the user as a result of the inquiry; As a result of the inquiry, when a new broadcast program is selected by the user, the base station of the target cell requests and acquires physical channel information about the new broadcast program, and the new broadcast program is obtained using the obtained physical channel information. The method of receiving a broadcast service further comprising the step of receiving. The method of claim 16, When the third broadcast area identifier list is different from the second broadcast area identifier list, and the third broadcast area identifier list includes the first broadcast area identifier list, the second broadcast area identifier list and the third broadcast area. Comparing the identifier list; If the third broadcast area identifier list further includes a broadcast area identifier other than the second broadcast area identifier list, determining that a new broadcast area has been entered; If the second broadcast area identifier list further includes a broadcast area identifier other than the third broadcast area identifier list, determining that the broadcast area identifier that has not previously belonged has been left; When the user enters the new broadcast area, asks the user to select a new broadcast program that can be provided in the new broadcast area, and when a new broadcast program is selected by the user, receiving the new broadcast program in the target cell. and, If the previous non-subscribed broadcast area is left but does not enter the new broadcast area, the method of receiving a broadcast service further comprising the step of notifying the user that the previous non-subscribed broadcast area has been left. .

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