JP2008538479A - System and method for providing a broadcast service in a mobile communication system - Google Patents

Abstract

  Disclosed is a broadcast service connection setting method for a mobile station (MS) in a mobile communication system supporting multicast and broadcast service (MBS) to receive MBS. The MS transmits a connection setup request for a specific broadcast service to the base station (BS). The MS receives from the BS a first identifier that is mapped to a specific broadcast service and a second identifier that is individually mapped to at least one content broadcast.

Description

  The present invention relates to a broadcast service in a mobile communication system, and more particularly, to a system and method for providing a broadcast service to a plurality of mobile stations.

In a 4 ^th generation (hereinafter referred to as “4G”) mobile communication system, a plurality of services having various quality of service (hereinafter referred to as “QoS”) at a transmission rate of about 100 Mbps are provided. Active research is progressing to provide it to users. The 4G mobile communication system is a next generation communication system. Current third generation; in (3 ^rd Generation or less, "3G" hereinafter) communication system, generally, in the outdoor channel environment having a relatively poor quality channel environment, and supports a data rate of about 384 Kbps, relatively Even in an indoor channel environment having a channel environment with good quality, a transmission speed of up to about 2 Mbps is supported.

  The 4G communication system is a broadband wireless access (BWA) communication system, and the BWA communication system has evolved into a multimedia broadcast / communication system capable of transmitting multimedia services. Yes. In order to support multimedia broadcast / communication, a base station (hereinafter referred to as “BS”) can transmit one or more multimedia data sources to multiple mobile stations (hereinafter referred to as “MS”). Multicast) and broadcast. A multicast and broadcast service for providing a broadcast service in a BWA communication system is called a multicast and broadcast service (hereinafter referred to as “MBS”). That is, “MBS” may be used in the same meaning as “broadcast service”.

  MBS supports the transmission of multimedia information such as real-time video and audio, still images, and text information, and provides not only audio data but also video data simultaneously via a broadcast channel for the multimedia transmission. be able to.

  FIG. 1 is a diagram schematically illustrating an architecture of an MBS system in a general mobile communication system, in particular, a BWA communication system.

  Referring to FIG. 1, a plurality of cells are included in one logical group for defining a broadcast service area according to its regional location. The logical group is called an “MBS zone”. That is, the cells 101, 103, 105, 107, 109, and 111 constitute one MBS zone, have an identifier '1' for identifying the MBS zone, and the cells 131, 133, 135, 137, 139, 141, and 143 constitute another MBS zone and have an MBS zone identifier “2”.

  The BS included in each MBS zone multicasts / broadcasts the same broadcast to the MS at the same time using the same frequency band, and the MS located in each MBS zone receives the broadcast in the same manner. To do. On the other hand, a server that manages the MBS zone, that is, an MBS server (not shown) is matched one-to-one with the MBS zone and manages the broadcast service list.

  For example, in order for the MS 170 to first receive the first broadcast service in the cell 109 having the MBS zone identifier “1”, the MBS connection setup for the first broadcast service must be performed with the cell 109 (BS 109). . The MBS connection is set by the MS 170 transmitting / receiving a dynamic service addition request (Dynamic Service Addition_REQuest; hereinafter referred to as “DSA_REQ”) and a dynamic service addition response (Dynamic Service Addition_ReSPonse; hereinafter referred to as “DSA_RSP) message. If the MS 170 moves to another BS in the MBS zone after completing the MBS connection setup for the first broadcast service, there is no need to re-execute the MBS connection setup for the first broadcast service. This is because broadcast services provided in the same MBS zone have the same connection identifier (hereinafter referred to as “CID”) and the same frame configuration.

  On the other hand, assume that the MS 170 moves from the current cell 109 to another cell 133 having different MBS zone identifiers. The CIDs of the first broadcast service provided in common in the area having the MBS zone identifier “1” and the area having the MBS zone identifier “2” have different values in each MBS zone. Also, the frame configuration is different in each MBS zone. Therefore, when moving to another cell having different MBS zone identifiers, the MS 170 must re-execute MBS connection setup.

  Here, MBS connection setup must be performed by the number of broadcast services that the MS 170 desires to receive. In other words, in order to receive the second broadcast service after completing the connection setup for the first broadcast service, the MS 170 must re-execute the connection setup for the second broadcast service.

  From the MBS zone perspective, broadcast services can be classified as follows.

  -Multiple BS broadcast service: Multiple BS broadcast service refers to a broadcast service performed in an MBS zone including multiple BSs. In the case of a broadcast service in the MBS zone, the same broadcast message is located / transmitted in the same region in the frequency and time domain of the downlink frame transmitted by all BSs in the MBS zone. That is, the same value is assigned to the multicast CID used for the MBS connection. That is, it means that all BSs in the MBS zone provide the same broadcast service in the same manner. For example, in the case of CID B assigned to the broadcast service A multicasted by the first BS, the broadcast service A may also exist in the second BS in the same MBS zone and is assigned to the broadcast service. The CID is the same as CID B used in the first BS.

  In addition, the MBS zone in the downlink frame for transmitting the actual data of the broadcast service A has the same position, the same size, and the same time zone in the downlink frame region from all BSs ( To get a physical macro diversity effect on the signal).

  -Single BS broadcast service: Unlike the multiple BS broadcast service, the single BS broadcast service means a broadcast service that is effective only in one BS. This means a broadcast service provided in the form of a specific spot (Hot Spot) within one BS. At this time, unlike the multiple BS broadcast service, one CID assigned to the broadcast service is assigned within a transport CID range managed by one BS. Unlike the multicast CID of the multiple BS broadcast service, the transport CID is unique only within the corresponding BS.

  The CID used for the MBS connection is shown in Table 1 below.

  The CID shown in Table 1 has the following uses and functions.

  -Initial ranging CID: This is the CID for the ranging request (RNG_REQ) message that the MS sends to the BS to receive the assignment of the first connection identifier (Primary CID) and the basic connection identifier (Basic CID). . All MSs must recognize the initial ranging CID CID value '0x0000'. At this time, the MS notifies the BS of its media access control (MAC) address using an RNG_REQ message during a negotiation process with the BS. Therefore, the BS maps the MAC address of the MS to the CID indicating the MS, that is, the first management CID (Primary Management CID) and the basic CID.

  First management CID: this is the CID used for processing of MAC management messages that must be performed between the MS and the BS, and the first management CID is the MS Used to identify. As shown in Table 1, one BS can manage and identify m MSs. The first management CID is recognized by the MS receiving a ranging response (RNG_RSP) message.

  -Basic CID: This is the CID used for the processing of MAC management messages that must be selectively performed between the MS and the BS, and the basic CID is used to identify the MS. Is done. As shown in Table 1, the number of basic CIDs is m, which is the same as the number of first management CIDs. Further, the basic CID is recognized by the MS receiving the RNG_RSP message, similarly to the first management CID.

  Broadcast CID: This is a CID indicating a message that all MSs receive and process, and has a CID value '0xFFFF' that all MSs already recognize.

  -Multicast polling CID: This is assigned or deallocated by a Multicast Polling Allocation Request (MCA_REQ) message and used during the multicast polling service.

  -Transport CID, second management CID: The transport CID is a CID used for transmission / reception of general data traffic, and is initiated by the BS-Initiated DSA_REQ message and the MS ( MS-Initiated) included in the DSA_RSP message received from the BS in response to the DSA_REQ message. The second management CID means a management connection CID for an upper layer such as Simple Network Management Protocol (SNMP) / Trivial File Transfer Protocol (TFTP), and is assigned to the MS. Included in the registration response (REG_RSP) message. The number of transport CIDs and second management CIDs falls within the range of 2m + 1 to 0xFE9F.

  -Adaptive Antenna System (AAS) initial ranging CID: This is the CID required when initial ranging is performed in the adaptive antenna system.

  Normal mode multicast CID: This is a CID indicating a multicast message received and processed only by a normally operating MS after completing a network registration process with a BS that is not in a sleep mode or an idle mode. Already has a recognized CID value '0xFFFB'.

  -Sleep mode multicast CID: CID indicating a multicast message to be processed only by the MS in the sleep mode, and having a CID value '0xFFFC' that is already recognized by all MSs.

  -Idle mode multicast CID: CID indicating a multicast message to be processed only by the MS in the idle mode, and having a CID value '0xFFFD' already recognized by all MSs.

  -Padding CID: This is a CID indicating a dummy message sent through a non-assigned (burst) region in uplink / downlink frames and has a CID value '0xFFFE' that is already known by all MSs. .

  -Multicast CID: This is the CID used to multicast the broadcast message. That is, this is the CID used to distinguish the MBS connection with the BS from other connections. Broadcast services provided in the same MBS zone have the same multicast CID. For example, if a BS A in an MBS zone assigns '0xFFA0' as a multicast CID for a specific MBS service, other BSs in the same MBS zone must also assign '0xFFA0' as a multicast CID for a specific MBS broadcast. I must. Here, the total number of multicast CIDs is 95.

  Generally, the CID has a size of 16 bits and is used in a MAC frame header to identify a connection. The CID is used for a MAC service data unit (SDU) like the CID in the traffic instruction message.

  FIG. 2 is a signaling diagram illustrating a broadcast service connection procedure in a conventional BWA communication system.

  Referring to FIG. 2, first, in step 202, the MS 200 searches a broadcast service list broadcast from the MBS server 280 to detect broadcast services that can be received via the BS 250. The broadcast service list includes information regarding broadcast services that the MS 200 can receive.

  In step 211, the MS 200 transmits a DSA_REQ message to the BS 250 in order to establish an MBS connection. The format of the DSA_REQ message is shown in Table 2 below.

  In the DSA_REQ message, the transaction ID field indicates a specific value for identifying a DSx_xxx message transmitted / received when the MS performs a plurality of dynamic service related processes. An information field encoded with Type / Length / Value (TLV) includes selective information. For example, the information field encoded with TLV includes information on the broadcast service requested by the MS 200.

  Here, the MS 200 includes information indicating whether an MBS connection is requested or a general service connection is included in the information field encoded with TLV, and the information field encoded with TLV is included in the BS 250 together with the DSA_REQ message. Send to. The instruction information is shown in Table 3 below.

  As shown in Table 3, when the DSA_REQ message having the value “0” is received, the BS 250 requests a general service connection in which the MS 200 is not an MBS connection. When receiving the DSA_REQ message having the value '1' (single BS broadcast service) or the value '2' (multiple BS broadcast service), the BS 250 requests connection setting for the MS 200 to receive the broadcast service. Recognize that. The DSA_REQ message may be transmitted from the BS 250 to the MS 200. In other words, for connection setup, the MS 200 can send a DSA_REQ message to the BS 250, or the BS 250 can send a DSA_REQ message to the MS 200. When the BS 250 transmits a DSA_REQ message to the MS 200, the DSA_REQ message transmitted by the BS 250 is a QoS parameter for the corresponding broadcast service in the TLV encoding format included in the DSA_RSP message described with reference to Table 7 below. And a broadcast service identifier (ie, multicast CID or transport CID). Even though the BS 250 can send a request for a single BS broadcast service or a multiple BS broadcast service to the MS 200, it is assumed that the MS 200 sends a request for a single BS broadcast service or a multiple BS broadcast service to the BS 250.

  Accordingly, the BS 250 transmits a Dynamic Service X_Receive (Dynamic Service X_ReceiVeD; DSX_RVD) message to the MS 200 in Step 213. The DSX_RVD message is used to notify the MS 200 that the BS 250 has successfully received a DSA related message such as a DSA_REQ message and is processing the received message.

  In Table 4, the transaction ID uses the value used in the DSA_REQ message, and the MS 200 can recognize that the DSX_RVD message is a response to the DSA_REQ message.

  Thereafter, in step 215, the BS 250 transmits a DSA_RSP message shown in Table 5 in response to a broadcast service connection request from the MS 200.

  In Table 5, the confirmation code (CC) has the format shown in Table 6 below, and includes response information for the DSA_REQ message.

  In Table 6, the BS 250 transmits a DSA_RSP message having a confirmation code (CC) = '0' (OK / success) as an affirmative response to the DSA_REQ message. In this case, the DSA_RSP message includes a QoS parameter and a broadcast service identifier (that is, a multicast CID or a transport CID) for the corresponding broadcast service in the TLV encoding format shown in Table 7 below. On the other hand, the other code values excluding the code value “0” are not directly related to the present invention, and the description thereof is omitted.

  If the MS 200 transmits a DSA_REQ message corresponding to a general connection request, the CID in <Table 7> must be the CID for the service corresponding to the general connection request.

  If the DSA_RSP message is received, the MS 200 transmits a DSA positive response (DSA_ACK) message shown in Table 8 below to the BS 250 in Step 217.

  After being assigned a CID for one broadcast service until step 217, the MS 200 performs steps 219 to 225 or steps 227 to 239 to receive an assignment of a CID for another broadcast service.

  As described above, it can be seen that only one broadcast service connection is set by the procedure in which the MS transmits a DSA_REQ message to the BS and the BS transmits the DSA_RSP message to the MS. In other words, to set up multiple broadcast service connections, the MS sends a DSA_REQ message multiple times. If the DSA_REQ message is received from the MS, the BS must send DSA_RSP messages corresponding to all DSA_REQ messages to the MS.

  FIG. 3 is a diagram schematically illustrating a general downlink frame configuration including MBS zone information.

  Referring to FIG. 3, the downlink frame includes a preamble region 301, a downlink MAP (DL-MAP) region 303, and MBS related regions 305, 307, 309, 311, 313, and 315. The preamble field 301 is used to transmit a synchronization signal for acquiring mutual synchronization between the BS and the MS, that is, a preamble sequence. The DL-MAP area 303 is used for transmitting a DL-MAP message, and includes an MBS_MAP information element (hereinafter referred to as “IE”) 305 when MBS is provided. The MBS_MAP_IE area 305 includes information required for decoding the MBS field. The format of the MBS_MAP_IE area 305 is shown in Table 9 below.

  In Table 9, the MBS zone identifier indicates the identifier of the corresponding MBS zone, and the OFDMA symbol offset indicates the start offset of the MBS-MAP message in the MBS field. In <Table 9>, the information next to the DIUC change instruction indicates size information of the MBS-MAP message and information required for decoding the MBS-MAP message in the MBS field.

  Meanwhile, the MBS field includes an MBS-MAP message 307 including MBS_Data_IE 309 and fields 311, 313, and 315 used for transmitting MBS data bursts.

  The MBS-MAP message 307 includes location information where the MS receiving the MBS service receives the MBS data burst and information required to decode the data burst. The format of the MBS-MAP message is shown in Table 10 below.

  In Table 10, the MBS-MAP message includes a plurality of IEs in addition to a 6-byte MAC generic header. That is, the MBS-MAP message includes 'management message type' indicating the type of transmission message, 'frame number', and MBS data burst information. The frame number is the same as the DL-MAP frame number, and 'MBS_DIUC change count' indicates whether the current MBS data burst profile is the same as the previous MBS data burst profile. If the MBS_DIUC change count value is changed, the MS must receive the downlink burst profile information included in the MBS-MAP message in TLV format. If the downlink burst profile information is not included in the MBS-MAP message, the MS can receive the downlink burst profile information through reception of the next DCD message. MBS_DATA_IE and MBS_DATA_Time_Diversity_IE indicate MBS data burst information received by the MS. That is, MBS_DATA_IE indicates information regarding fields 311, 313, and 315 used to transmit an MBS data burst. MBS_DATA_Time_Diversity_IE is similar to MBS_DATA_IE 309, and includes MBS data burst information when MBS data for an MS supporting the hybrid automatic repeat request (H-ARQ) scheme exists.

  The format of MBS_DATA_IE309 is shown in Table 11 below.

  In Table 11, MBS_DATA_IE includes a “next MBS MAP change indication” field indicating whether or not the size of the MBS-MAP message in the next MBS frame has been changed, and multicast identifier information mapped to the IE information. 'Multicast CID' field, 'OFDMA symbol offset' and 'Subchannel offset' fields indicating the start offset of the MBS data burst field, 'Number of OFDMA symbols' indicating the size of the MBS data burst field and' Subchannel The 'number' field, the 'repetitive encoding indication' field required to decode the MBS data burst field, and the offset of the MBS-MAP message in the next MBS frame. 'Next' indicating the size of the MBS-MAP message in the next MBS frame when the 'Next MBS frame offset' and 'Next MBS OFDMA symbol offset' fields and the Next MBS MAP change indication field are set to '1' And “number of MBS OFDMA symbols” and “number of next MBS OFDMA subchannels” fields.

  As described above, in the conventional BWA communication system, the MS transmits a request for a desired broadcast service to the BS. For example, the MS may request the broadcast service of the broadcast station A, or may request the broadcast service of the broadcast station B. However, even if broadcast station A or broadcast station B provides a variety of content (eg, drama, sports, movies, etc.), the MS has no way to request each of the content separately.

  Further, the total possible number of multicast CIDs for identifying broadcast services is 95. Therefore, if the number of broadcast services exceeds 95, it is impossible to assign a multicast CID to the excess broadcast services. In addition, when multicast CIDs are allocated in units of content, the shortage of the number of multicast CIDs is a considerable number, and resource consumption and time delay increase with an increase in the number of transmission / reception of DSA_REQ and DSA_RSP messages. Accordingly, there is a growing need for a method that can extend the number of IDs for identifying broadcast services and content, and minimize resource consumption and time delay.

  In view of the above background, an object of the present invention is to provide a system and method for extending the number of broadcast service identifiers in a mobile communication system.

  Another object of the present invention is to provide a system and method capable of identifying content in a mobile communication system.

  It is a further object of the present invention to provide a broadcast service connection setup method and system for minimizing resource consumption and time delay in a mobile communication system.

  In order to achieve the above object, according to a first aspect of the present invention, a broadcast for a mobile station (MS) in a mobile communication system supporting a multicast and broadcast service (MBS) to receive the MBS. The service connection setup method includes a step of transmitting a connection setup request for a specific broadcast service to a base station (BS), a first identifier mapped from the BS to the specific broadcast service, and at least one content broadcast individually. Assigned a second identifier to be mapped to.

  According to another aspect of the present invention, a broadcast service for a base station (BS) in a broadband wireless access (BWA) communication system supporting a multicast and broadcast service (MBS) to provide the MBS to a mobile station (MS). The connection setup method receives a connection setup request for a specific broadcast service from the MS, a first identifier mapped to the specific broadcast service, and a second individually mapped to at least one content broadcast Assigning an identifier to the MS.

  According to still another aspect of the present invention, a broadcast service connection for providing the MBS between a mobile station (MS) and a base station (BS) in a mobile communication system supporting a multicast and broadcast service (MBS). The setting method includes a step in which the MS transmits a connection setting request for a specific broadcast service to the BS, a first identifier mapped to the specific broadcast service, and at least one content broadcast individually mapped to the BS. Allocating the second identifier to the MS, and receiving the MBS mapped to the allocated identifier by the MS.

  According to still another aspect of the present invention, a broadcast service connection setup system for providing MBS in a mobile communication system supporting multicast and broadcast service (MBS) is provided for connection to a specific broadcast service and a plurality of content broadcasts. A mobile station (MS) that transmits a setting request and receives a first identifier mapped to the specific broadcast service, and a connection to the specific broadcast service and a plurality of content broadcasts provided by the specific broadcast service If a setting request is received, a first identifier mapped to the specific broadcast service and a second identifier mapped to at least one content broadcast Characterized in that it comprises a base station (BS) to assign identifiers.

  According to still another aspect of the present invention, a broadcast service connection setup method for providing the MBS in a broadband wireless connection (BWA) communication system supporting multicast and broadcast service (MBS) is provided as a base station (BS). In order to set up a connection for a specific broadcast service and a plurality of content broadcasts provided by the specific broadcast service, a connection setup request message having a broadcast service identifier type / length / value (TLV) is transmitted to the base station (BS). ), And the MS transmits a response to the connection setup request message to the BS.

  The present invention can minimize resource consumption and time delay by setting up multiple broadcast service connections between MBS connections between BS and MS. In addition, according to the present invention, it is possible to expand the number of limited multicast CIDs by providing new logical channel IDs and easily assigning IDs to a plurality of content broadcasts.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a preferred embodiment of the invention will be described in detail with reference to the accompanying drawings. In the following description, for the purpose of clarifying only the gist of the present invention, a specific description regarding related known functions or configurations is omitted.

  In the present invention, a mobile station (Mobile Station; hereinafter referred to as “MS”) in a mobile communication system transmits connection setting requests for a plurality of broadcast services to a base station (hereinafter referred to as “BS”). The BS proposes a method of assigning a connection identifier (Connection Identifier; hereinafter referred to as “CID”) uniquely mapped to a plurality of broadcast services to the MS. Here, “broadcast service” means a broadcast service provided by each broadcast station or a content broadcast service provided by a broadcast station.

  That is, the present invention proposes a method for requesting connection settings for a plurality of broadcast services in one procedure and a method for assigning CIDs for a plurality of broadcast services. In addition, the present invention proposes a scheme capable of extending the number of multicast CIDs in order to allocate a plurality of broadcast service CIDs. For this purpose, the present invention provides the following four embodiments.

  The present invention newly defines 'Multiple Broadcast Service ID Type / Length / Value (TLV) Encoding' for Broadcast Channel ID to send a request for multiple broadcast services to BS through one DSA_REQ message. To do. Multiple broadcast service ID TLV encodings, if the MS sends a request for a broadcast service connection and receives a response to it, a dynamic service addition request (DSA_REQ) to indicate the multiple broadcast services requested by the MS The TLV of the message is included in the encoded information field. The plurality of broadcast service ID TLV encodings include information on at least one of the broadcast services requested by the MS.

  However, the method for indicating the broadcast service requested by the MS can be implemented in various ways according to the level indicating the broadcast service or the broadcast service provider. Accordingly, parameters used in the plurality of broadcast service ID TLV encodings are not related to the present invention, and thus detailed description thereof is omitted.

  Table 12 below shows a format of a plurality of broadcast service ID TLV encodings included in the DSA_REQ message.

  Parameters indicating a plurality of broadcast services are included in a plurality of broadcast service ID TLV encodings shown in Table 13 below.

  Table 13 shows an example of parameters used in a plurality of broadcast service ID TLV encodings. The broadcast service ID TLV in Table 12 includes the IP address and port number of the BS that provides the broadcast service. When the DSA_REQ message including the broadcast service ID TLV in Table 12 is received, the BS sets up an MBS connection for each of a plurality of broadcast services requested by the MS.

  Further, the present invention newly defines a logical channel identifier (ID). The logical channel ID may be used as an ID that can identify a plurality of contents. Also, the logical channel ID may be extended in combination with a multicast CID and used to identify a broadcast service or content. For example, the logical channel ID can have a total of 256 values from 0 to 255, and is included in a dynamic service addition request (DSA_REQ) message or a DSA_response (DSA_RSP) message. The logical channel ID can be included in an information field in which the TLV of the message is encoded, and the format is shown in Table 14 below.

  If the MS sends a DSA_REQ message with multiple broadcast service ID TLV encodings to the BS, the BS sends a DSA_RSP message with information about multiple logical channel IDs to the MS. Here, as shown in Table 14, for example, even if the number of logical channel IDs is 256, the number of logical channel IDs can be expanded according to the number of broadcast services provided by the BS. Should be noted.

  For example, the MS according to the present invention may request assignment of one CID or may request assignment of a plurality of IDs mapped to a plurality of contents. That is, the MS may request only the assignment of the CID of the first broadcasting station, that is, the transport CID or the multicast CID, and not only the CID of the first broadcasting station but also the content A provided by the broadcasting station. , B, and C may be requested up to assignment of a plurality of IDs.

  Thus, the BS may send a DSA_RSP message to the MS, including only the transport CID or multicast CID, and the DSA_RSP message with the logical channel ID mapped to the multicast CID and content A, B, and C. May be sent to. The BS may also send a DSA_RSP message to the MS along with the multicast CID and up to 256 IDs of content provided at the broadcast station.

  Here, when the second broadcasting station broadcasts the same content as the contents A, B, and C, the logical channel ID mapped to the contents A, B, and C of the second broadcasting station is the first The logical channel ID mapped to the contents A, B, and C of one broadcasting station may be the same or different.

  FIG. 4 is a signaling diagram illustrating a broadcast service connection procedure in the BWA communication system according to the present invention.

  Referring to FIG. 4, the MS 400 searches a broadcast service list broadcast from the MBS server 480 to detect broadcast services that can be received via the BS 450 in step 402. The broadcast service list includes information necessary for the MS 400 to receive the broadcast service.

  In step 411, the MS 400 transmits a DSA_REQ message to the BS 450 to request MBS connection setup. In the case of a DSA_REQ message, either a conventional DSA_REQ message or a DSA_REQ message newly proposed in the present invention may be used. That is, the DSA_REQ message newly proposed in the present invention means a message that can request connection of content provided by a corresponding broadcast station. The connection request information is included in an information field in which the TLV of the DSA_REQ message is encoded.

  When receiving the DSA_REQ message, the BS 450 recognizes that the MS 400 requests connection setting for receiving the broadcast service. Here, it is assumed that the MS 200 requests a single BS broadcast service or a multiple BS broadcast service, and each of the broadcast services provides a plurality of content broadcasts.

  Accordingly, in step 413, the BS 450 sends a dynamic service X_Receive (DSX_RVD) message to the MS 400. The DSX_RVD message is used to notify the MS 400 that the BS 450 has successfully received a DSA related message such as a DSA_REQ message and is processing the received message.

  Thereafter, in step 415, the BS 450 transmits a DSA_RSP message newly defined in the present invention to the MS 400 in response to a broadcast service connection request from the MS 400. The information field in which the TLV of the newly defined DSA_RSP message is encoded is assigned a CID mapped to the broadcast service requested by the MS 400 and a logical channel ID mapped to a plurality of content broadcasts. Here, it should be noted that the CID is a transport CID in the case of a single BS broadcast service, and a multicast CID in the case of a multiple BS broadcast service.

  If the DSA_RSP message is received, in step 417, the MS 400 transmits a DSA acknowledgment (DSA_ACK) message as shown in Table 8 to the BS 450.

  The MS 400 can receive a plurality of broadcasts through one connection setup procedure after being assigned a CID for one broadcast service and a logical channel ID for a plurality of content broadcasts until step 417.

  An example of the use of a combination of CID and logical channel ID can be summarized as follows.

  -CID: Logical channel ID == Broadcast service provider: Content broadcast ID in broadcast service

  In the above usage example, a multicast CID or a transport CID is used to identify a service provider that provides a corresponding broadcast service, and a logical channel is used to identify a plurality of content broadcasts provided by the corresponding broadcast service. It means that ID is used. Therefore, the MS can dynamically select a plurality of content broadcasts provided by the broadcast service provider in one connection setup procedure.

  On the other hand, if the number of content broadcasts provided by the corresponding broadcast service provider exceeds 256, which is the number of logical channel IDs, the BS may recognize a plurality of logical group IDs (which may be transported in some cases). CID or multicast CID) can be assigned. This means that the MS has to perform multiple DSA_REQ / RSP procedures. In this case, the MBS server has a logic that has a maximum of 256 broadcast services in the MBS broadcast service list received by the MS so that it can recognize that the MS should perform multiple DSA_REQ / RSP procedures. An MBS broadcast service list is provided by displaying group units. The MS performs the DSA_REQ / RSP procedure a number of times corresponding to the logical group information.

  For example, the MBS broadcast service list may include logical channel IDs of 0 to 255 for the logical group ID # 1 and logical channel IDs of 256 to 511 for the logical group ID # 2. Therefore, when the MS requests content mapped to the logical channel IDs 1, 200, and 255, the MS can perform connection setting by transmitting a single DSA_REQ message. However, when requesting content mapped to the logical channel IDs 200 and 500, the MS can perform connection setup by transmitting the DSA_REQ message twice.

  Most preferably, the possible number of broadcast services mapped to one CID, ie one logical group ID, is expanded. That is, assuming that the total number of contents provided with one CID is 65536, it is preferable to extend the range of logical channel IDs from 0 to 65535. This means that the length field must be extended to a length of 2 bytes.

  -Multicast CID: Logical channel ID == Broadcast service providing group ID: Broadcast service provider

  The above usage example shows a solution when the number of providers providing broadcast services in one MBS zone exceeds 95. In other words, when the number of multicast CIDs is 95 while the number of broadcast service providers in one MBS zone exceeds 95, the multicast CID is used as the ID of the broadcast service provision group, The logical channel ID replaces the multicast CID.

  For example, a broadcast service provider having a multicast CID value of 0 to 94 has a broadcast service providing group ID “0”, and the multicast CID value of 0 to 94 is replaced with a logical channel ID value. Also, the broadcast service provider mapped to the multicast CID values of 95 to 189 has the broadcast service providing group ID “1”, and the multicast CID values of 95 to 189 are replaced with logical channel ID values.

  That is, broadcast service providing group ID: broadcast service provider = 0: 94 means a broadcast service provider having an existing multicast CID value 94.

  Broadcast service providing group ID: broadcast service provider = 1: 94 means the 189th broadcast service provider newly added to the MBS zone.

  Here, the broadcast service providing group ID can be expanded up to 95, which is the number of multicast CIDs. That is, the broadcast service providing group ID has a value from 0 to 94.

  On the other hand, if a plurality of broadcast connections are established between the MS and the BS through the transmission / reception procedure of the DSA_REQ / DSA_RSP message, the MS can receive the broadcast message for the corresponding MBS connection. Therefore, the MBS_DATA_IE format is modified so that the MS can identify the broadcast service and the content broadcast using the logical channel ID. The corrected MBS_DATA_IE format is shown in Table 15 below.

  As shown in Table 15, the modified MBS_DATA_IE format adds a new logical channel ID so that the MS can identify the corresponding broadcast service when the MBS service is actually mapped to a frame. Indicates that

  On the other hand, the present invention prevents the same multicast CID from being repeatedly included when considering a downlink burst composed only of broadcast services having the same CID (or different logical channel IDs). Therefore, a CID list format parameter is added to the MBS_DATA_IE format.

  In the MBS_DATA_IE format, CID list format = 0 means that the broadcast message CID in the MBS data burst indicated by MBS_DATA_IE is not the same. That is, since it means that there are at least two broadcast messages CID, as shown in <Table 13>, a plurality of multicast CIDs and a plurality of logical channel IDs are configured in pairs, and the broadcast service message allocation order Can be distinguished. That is, the MS must recognize that the broadcast message is included in the MBS data burst indicated by MBS_DATA_IE in the order of multicast CID :: logical channel ID. Here, the broadcast message included in the MBS data burst has a MAC frame format, and the CID field in the header field of the MAC frame includes a multicast CID. Also, since the present invention provides a logical channel ID, the broadcast message is included in MBS_DATA_IE in the order of multicast CID :: logical channel ID.

  On the other hand, CID list format = 1 means that all broadcast message CIDs in the MBS data burst indicated by MBS_DATA_IE are the same. Therefore, it is not necessary to repeatedly include the same multicast CID, and the order of allocation of broadcast service messages can be distinguished using one multicast CID and a plurality of logical channel IDs related thereto. Multiple broadcast service messages for one logical channel ID may be included in one MBS data burst. It should be noted that in such a situation, a plurality of logical channel IDs may be included in one MBS_DATA_IE.

  FIG. 5 is a flowchart illustrating a process in which the MS performs broadcast service connection setup according to the present invention.

  Referring to FIG. 5, in step 502, the MS searches and detects a broadcast service list provided from the MBS server. In step 504, the MS sends a DSA_REQ message to the BS. Here, it is assumed that the information field encoded with the TLV of the DSA_REQ message includes an indication value indicating a single BS broadcast service connection request or a multiple BS broadcast service connection request. In the case of a DSA_REQ message, either a conventional DSA_REQ message or a DSA_REQ message provided in the present invention can be used. In the provided DSA_REQ message, not only the corresponding broadcast service but also the content provided by the broadcast service can be used for the connection request. In step 506, the MS is assigned from the BS a CID that is mapped to the requested broadcast service and at least one logical channel ID that is mapped to content provided by the broadcast service. Here, the CID mapped to the broadcast service is a transport CID used in the single BS broadcast service or a multicast CID used in the multiple BS broadcast service.

  FIG. 6 is a flowchart illustrating a process in which a BS according to the present invention performs broadcast service connection setup.

  Referring to FIG. 6, in step 602, the BS receives a DSA_REQ message including an indication value indicating a single BS broadcast service connection request or a multiple BS broadcast service connection request from the MS. In the case of a DSA_REQ message, either a conventional DSA_REQ message or a DSA_REQ message provided in the present invention can be used. In the provided DSA_REQ message, not only the corresponding broadcast service but also the content provided by the broadcast service can be used for the connection request. In step 604, the BS assigns to the MS a CID that is mapped to the requested broadcast service and at least one logical channel ID that is mapped to content provided by the broadcast service. Here, the CID is a transport CID or a multicast CID.

  The second embodiment of the present invention provides a scheme in which the BS performs a broadcast service connection when the MS transmits a conventional DSA_REQ message to the BS.

  The conventional DSA_REQ message can be used only for a connection request for a single BS broadcast service. Therefore, in the second embodiment of the present invention, when the conventional DSA_REQ message is received from the MS, the BS has connection information for at least one broadcast service provided in the MBS zone to which the BS belongs in the DSA_RSP message, That is, a DSA_RSP message corresponding to the received DSA_REQ message including the MBS content ID is transmitted to the MS.

  Therefore, the format shown in Table 16 below must be included in the information field in which the TLVs of the DSA_RSP message and the DSA_ACK message are encoded. Table 16 shows the format of the MBS content ID parameter.

  The MBS content ID parameter shown in Table 16 has a TLV encoding format, and includes the ID of the broadcast service (or broadcast channel) provided from the BS in the MS that requested the broadcast service. When the number of MBS content IDs is N, since the length of one MBS content ID is 2 bytes, the total length of all MBS content IDs is 2 * N. The length of the MBS content ID can be changed according to its implementation. Since the value included in the MBS content ID has to be discussed in the upper layer of the MAC layer, it is not directly related to the present invention.

  When the DSA_RSP message including the MBS content ID is received, the MS must grasp the logical channel ID allocation relationship that is different in concept from the logical channel ID shown in Table 14. That is, the logical channel ID can also be assigned from the value of 0 in the order of the MBS content ID included in the DSA_RSP message. For example, in the value field of <Table 16>, the logical channel ID '0' is assigned to the first MBS content ID (ie, MBS content ID (0)), and the logical channel ID '1' is the second The MBS content ID (ie, MBS content ID (1)) is assigned, and the logical channel ID “N” is assigned to the Nth MBS content ID (ie, MBS content ID (N−1)). The MBS content ID TLV in Table 16 may also be used when the MS requests multiple broadcast services using a DSA_REQ message that can request multiple broadcast service connections.

  On the other hand, the BS may request an MBS connection by sending a DSA_REQ message to the MS. Accordingly, the BS can transmit the MBS content ID TLV provided in the second embodiment of the present invention to the MS together with the DSA_REQ message. For reference, the DSA_REQ message includes one CID.

  The third embodiment of the present invention provides an MBS_DATA_IE format different from the MBS_DATA_IE format of Table 15. When the MS recognizes the broadcast service permitted to itself according to the first embodiment or the second embodiment, the BS transmits MBS_DATA_IE shown in Table 17 below to the MS together with the downlink frame.

  As shown in Table 17, the MBS_DATA_IE format indicates that a logical channel ID is assigned according to a multicast CID when a broadcast service is mapped to a downlink frame. The MS must recognize in advance that broadcast messages mapped to the multicast CID :: logical channel ID are sequentially included in the MBS data burst field of the downlink frame. This is possible for the MS to read the MBS_DATA_IE. Here, the broadcast message included in the MBS data burst field has a MAC frame format, and the multicast CID is included in the CID field of the MAC frame header field.

  Also, the broadcast message mapped to the multicast CID :: logical channel ID may be sequentially included in the MBS data burst field of the downlink frame. However, the broadcast message mapped to the multicast CID :: logical channel ID may not be sequentially included in the MBS data burst field. In this case, the logical channel ID is included before the broadcast content included in the broadcast message in the MBS data burst field.

  Assigning a broadcast message to the MBS data burst field of a broadcast downlink frame, regardless of the order of multicast CID :: logical channel ID or regardless of the order, includes whether the logical content includes the logical channel ID in the broadcast message. is connected with.

  The fourth embodiment of the present invention provides a modified MBS MAP message format. When the MS recognizes the broadcast service allowed to it, that is, when the MS recognizes the logical channel ID, the BS can use the conventional MBS_DATA_IE and the MBS_DATA_IE according to the present invention when providing the broadcast service to the MS. Use a modified MBS MAP message that all can be applied. The format of the modified MBS MAP message is shown in Table 18 below.

  The MBS MAP message newly proposed in the present invention has a format in which a '#MBS_DATA_IE with Logical ChannelID' field is added to the conventional MBS MAP message. The MS refers to the conventional MBS_DATA_IE for the broadcast service recognized by the DSA_RSP message including only the multicast CID. However, the MS receiving the DSA_RSP message including not only the multicast CID but also the logical channel ID refers to the MBS_DATA_IE provided in the first embodiment or the third embodiment of the present invention. In Table 18, when the '#MBS_DATA_IE with Logical ChannelID' field indicating the number of logical channel IDs has a value of '0', it means that MBS_DATA_IE having a logical channel ID does not exist in the MBS MAP message. .

  In the detailed description of the present invention, specific embodiments have been described. Needless to say, various modifications can be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be defined by the claims and their equivalents.

1 is a diagram schematically illustrating an architecture of an MBS system in a general mobile communication system. It is a signaling diagram which shows the broadcast service connection procedure in the conventional BWA communication system. It is a figure which shows schematically the structure of the downlink frame containing the MBS zone information in a general BWA communication system. FIG. 6 is a signaling diagram illustrating a broadcast service connection procedure in a BWA communication system according to an embodiment of the present invention. 4 is a flowchart illustrating a process of performing broadcast service connection setup by an MS according to an embodiment of the present invention. 4 is a flowchart illustrating a process of performing a broadcast service connection setup by a BS according to an embodiment of the present invention.

Claims (58)

A broadcast service connection setting method for a mobile station (MS) in a mobile communication system supporting a multicast and broadcast service (MBS) to receive the MBS,
Sending a connection setup request for a particular broadcast service to a base station (BS);
Receiving a first identifier assigned from the BS and mapped to the specific broadcast service and a second identifier individually mapped to at least one content broadcast. Connection setting method.   2. The broadcast service connection setting method according to claim 1, wherein the connection setting request is included in an information field encoded with a type / length / value (TLV) of a dynamic service addition request (DSA_REQ) message.   The broadcast service connection setting method according to claim 1, wherein the first identifier is a transport connection identifier (CID) for identifying a broadcast service broadcasted uniquely in one cell.   2. The broadcast service connection setting method according to claim 1, wherein the first identifier is a multicast CID for identifying a broadcast service broadcast in common in a plurality of predetermined cells.   The broadcast according to claim 1, wherein a combination value obtained by a combination of the first identifier and the second identifier is assigned as a third identifier that is mapped to each content broadcast in a one-to-one relationship. Service connection setting method.   The broadcast service connection setting method according to claim 1, wherein a combination value obtained by combining the first identifier and the second identifier is assigned as a fourth identifier mapped to the specific broadcast service. .   The broadcast service connection setting method according to claim 1, wherein the second identifier is an MBS content ID mapped to the at least one content broadcast.   8. The broadcast service connection setting method according to claim 7, wherein the second identifier is an MBS content ID mapped to the at least one content broadcast.   The broadcast service connection setting method according to claim 1, wherein the second identifier is a logical channel identifier assigned to the first identifier.   10. The broadcast service connection setting method according to claim 9, wherein the logical channel identifier is used to distinguish between second identifiers belonging to the same first identifier. A broadcast service connection setting method for a base station (BS) in a mobile communication system supporting a multicast and broadcast service (MBS) to provide the MBS to a mobile station (MS),
Receiving a connection setup request for a specific broadcast service from the MS;
Assigning to the MS a first identifier mapped to the specific broadcast service and a second identifier individually mapped to at least one content broadcast.   12. The broadcast service connection setting method according to claim 11, wherein the identifier is included in an information field in which a type / length / value (TLV) of a dynamic service addition response (DSA_RSP) message is encoded.   12. The broadcast service connection setting method according to claim 11, wherein the first identifier is a transport connection identifier (CID).   12. The broadcast service connection setting method according to claim 11, wherein the first identifier is a multicast CID.   12. The broadcast service connection according to claim 11, wherein a combination value based on a combination of the first identifier and the second identifier is assigned as a third identifier mapped one-to-one to each content broadcast. Setting method.   12. The broadcast service connection setting method according to claim 11, wherein a combination value by a combination of the first identifier and the second identifier is assigned as a fourth identifier mapped to the specific broadcast service. .   Information indicating the location and size of the MBS data obtained through the allocation of the first identifier and the second identifier, or the third identifier or the fourth identifier is an identification of the MBS MAP message of the downlink frame. The broadcast service connection setting method according to claim 15, wherein the broadcast service connection setting method is transmitted by being included in the field.   The information indicating the location and size of the MBS data obtained through the assignment of the first identifier and the second identifier, the third identifier, or the fourth identifier is the identification of the MBS MAP message of the downlink frame. 17. The broadcast service connection setting method according to claim 16, wherein the broadcast service connection is set and transmitted.   The broadcast service connection setting method according to claim 17, wherein the MBS MAP message includes information indicating a number of pieces of information indicating a position and a size of MBS data having the second identifier.   19. The broadcast service connection setting method according to claim 18, wherein the MBS MAP message includes information indicating the number of pieces of information indicating the position and size of MBS data having the second identifier.   The broadcast service connection setting method according to claim 17, wherein the MBS MAP message includes information on the first identifier and the second identifier.   The broadcast service connection setting method according to claim 18, wherein the MBS MAP message includes information on the first identifier and the second identifier.   18. The broadcast service connection setting method according to claim 17, wherein the information indicating the location and size of the MBS data is represented by the first identifier and the second identifier.   19. The broadcast service connection setting method according to claim 18, wherein the information indicating the location and size of the MBS data is represented by the first identifier and the second identifier.   12. The broadcast service connection setting method according to claim 11, wherein the second identifier is an MBS content ID mapped to the at least one content broadcast.   12. The broadcast service connection setting method according to claim 11, wherein the second identifier is a logical channel identifier assigned to the first identifier.   27. The broadcast service connection setting method according to claim 26, wherein the logical channel identifier is used to distinguish a second identifier belonging to the same first identifier. A broadcast service connection setting method for providing the MBS between a mobile station (MS) and a base station (BS) in a mobile communication system supporting a multicast and broadcast service (MBS),
The MS sending a connection setup request for a specific broadcast service to the BS;
The BS assigns to the MS a first identifier mapped to the particular broadcast service and a second identifier individually mapped to at least one content broadcast;
Receiving the MBS mapped to the assigned identifier by the MS, and a broadcast service connection setting method.   The broadcast service connection setting method according to claim 28, wherein the first identifier is a transport connection identifier (CID).   The broadcast service connection setting method according to claim 28, wherein the first identifier is a multicast CID.   The broadcast service connection setting method according to claim 28, wherein the second identifier is an MBS content ID mapped to each of a plurality of content broadcasts.   29. The broadcast service according to claim 28, wherein a combination value based on a combination of the first identifier and the second identifier is assigned as a third identifier mapped one-to-one to the plurality of content broadcasts. Connection setting method.   29. The broadcast service connection setting method according to claim 28, wherein a combination value based on a combination of the first identifier and the second identifier is assigned as a fourth identifier mapped to the specific broadcast service. .   Information indicating the location and size of the MBS data obtained through the allocation of the first identifier and the second identifier, or the third identifier or the fourth identifier is an identification of the MBS MAP message of the downlink frame. 33. The broadcast service connection setting method according to claim 32, wherein the broadcast service connection setting method is transmitted by being included in the field of.   The information indicating the location and size of the MBS data obtained through the assignment of the first identifier and the second identifier, the third identifier, or the fourth identifier is the identification of the MBS MAP message of the downlink frame. 34. The broadcast service connection setting method according to claim 33, wherein the broadcast service connection setting method is transmitted by being included in the field.   35. The broadcast service connection setting method according to claim 34, wherein the MBS MAP message includes information indicating the number of pieces of information indicating a position and a size of MBS data having the second identifier.   36. The broadcast service connection setting method according to claim 35, wherein the MBS MAP message includes information indicating a number of pieces of information indicating a position and a size of MBS data having the second identifier.   The broadcast service connection setting method according to claim 34, wherein the MBS MAP message includes information on the first identifier and the second identifier.   The broadcast service connection setting method according to claim 35, wherein the MBS MAP message includes information on the first identifier and the second identifier.   The broadcast service connection setting method according to claim 28, wherein the second identifier is an MBS content ID mapped to the at least one content broadcast.   29. The broadcast service connection setting method according to claim 28, wherein the second identifier is a logical channel identifier assigned to the first identifier.   The broadcast service connection setting method according to claim 41, wherein the logical channel identifier is used to distinguish between second identifiers belonging to the same first identifier. A broadcast service connection setting system for providing the MBS in a mobile communication system supporting a multicast and broadcast service (MBS),
A mobile station (MS) that transmits a connection setup request for a specific broadcast service and a plurality of content broadcasts and receives a first identifier mapped to the specific broadcast service;
When receiving a connection setting request for the specific broadcast service and a plurality of content broadcasts provided by the specific broadcast service, the first identifier mapped to the specific broadcast service and at least one content broadcast A broadcast service connection setting system comprising: a base station (BS) to which a mapped second identifier is assigned.   The MS transmits a connection setup request for the plurality of content broadcasts in an information field in which a dynamic service addition request (DSA_REQ) message type / length / value (TLV) is encoded. Item 44. The broadcast service connection setting system according to Item 43.   The broadcast service connection setup according to claim 43, wherein the BS allocates the identifier by including it in an information field encoded with a type / length / value (TLV) of a dynamic service addition response (DSA_RSP) message. system.   44. The broadcast service connection setting system according to claim 43, wherein the first identifier is a transport connection identifier (CID).   44. The broadcast service connection setting system according to claim 43, wherein the first identifier is a multicast CID.   44. The BS assigns a combination value based on a combination of the first identifier and the second identifier as a third identifier mapped one-to-one to the plurality of content broadcasts. Broadcast service connection setting system.   44. The broadcast service connection according to claim 43, wherein the BS assigns a combination value based on a combination of the first identifier and the second identifier as a fourth identifier mapped to the specific broadcast service. Configuration system.   50. The broadcast service connection setup system according to claim 49, wherein the BS transmits information indicating the location and size of MBS data included in an MBS data information element of an MBS MAP message of a downlink frame.   The broadcast service connection setting system according to claim 50, wherein the MBS MAP message includes information indicating a number of pieces of information indicating a position and a size of MBS data having the second identifier.   51. The broadcast service connection setting system according to claim 50, wherein the information indicating the location and size of the MBS data is represented by the first identifier and the second identifier.   53. The broadcast service of claim 52, wherein the MBS data is sequentially included in an MBS data burst field of a downlink frame based on information represented by the first identifier and the second identifier. Connection setting system.   The broadcast service according to claim 52, wherein the MBS data is randomly included in an MBS data burst field of a downlink frame regardless of the information represented by the first identifier and the second identifier. Connection setting system.   55. The broadcast service connection setup system according to claim 54, wherein the MBS data is distinguished by a logical channel identifier included in the MBS MAP message.   44. The broadcast service connection setting system according to claim 43, wherein the second identifier is an MBS content ID mapped to the at least one content broadcast.   44. The broadcast service connection setting system according to claim 43, wherein the second identifier is a logical channel identifier assigned to the first identifier.   58. The broadcast service connection setting system according to claim 57, wherein the logical channel identifier is used to distinguish between second identifiers belonging to the same first identifier.

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