KR20090044685A - Apparatus and method for supporting diverse types of multicast and broadcast service in broadband wireless communication syustem - Google Patents

Abstract

The present invention relates to a broadband wireless communication system providing a multicast and broadcast service (MBS), which includes an MBS server for classifying MBS types for MBS zones, and MBS type information of an MBS zone to which it belongs. And a base station for transmitting the information to the terminal, and a terminal for identifying the type of the MBS zone to which the MBS type belongs by using the MBS type information. Can provide.

MBS (Multicast and Broadcast Service), MBS Type Classification, Transmission Group Classification

Description

Apparatus and method for supporting various types of multicast and broadcast services in a broadband wireless communication system TECHNICAL FIELD

The present invention is to support a multicast and broadcast service (hereinafter referred to as "MBS") in a broadband wireless communication system, and in particular, by distinguishing the various types (MBs) of MBS in a broadband wireless communication system An apparatus and method for supporting are provided.

Multicast and broadcast service (hereinafter referred to as MBS) is a service that provides multimedia contents to multiple terminals at the same time using a broadband wireless communication network. A general radio resource usage scheme for providing MBS in a broadband wireless communication system is shown in FIG. 1. Referring to FIG. 1, in order to support MBS, there is an MBS map (MAP) Information Element (IE) 110, an MBS map message 120, and an MBS data burst 130. The MBS map IE 110 exists in a downlink (DL) map for cellular communication and indicates the location of the MBS map message 120. The MBS map message 120 is a control message indicating the location of the MBS data burst 130. Here, the MBS map message 120 indicates the MBS data burst 130 present in a frame after several frames instead of the same frame. According to the Institute of Electrical and Electronics Engineers (IEEE) 802.16e standard, the MBS map message 120 indicates the MBS data burst 130 after two to five frames. In addition, the MBS map message 120 includes offset information of a frame including the next MBS map message. The MBS data burst 130 refers to an air transmission unit of multimedia content to be provided through MBS. Here, the region including the MBS map message 120 and the MBS data burst 130 is referred to as an MBS region 140 in a frame.

In providing the MBS, an MBS type is classified according to how it is applied to a wireless communication system. The classification criteria of the MBS type include a multiple base station scheme, a single base station scheme, a multicast scheme or a broadcast scheme, and a dynamic scheme or static scheme. ) And the like.

First, the multi-base station method and the single base station method will be described. First, according to the multiple base station scheme, a plurality of base stations transmit the same MBS map message 120 and MBS data burst 130 included in the MBS region 140 in FIG. That is, the multiple base station scheme is a scheme for providing a macro diversity effect to a terminal using MBS by generating and transmitting a physical signal in the same manner. In this case, a bundle of a plurality of base stations that generate and transmit a physical signal in the same manner is referred to as an MBS zone. In this case, however, a synchronization process between the plurality of base stations is required. According to the single base station method, each base station performs an independent MBS in its cell. Thus, unlike the multiple base station scheme, each base station does not perform synchronization with neighboring base stations. In this case, each base station becomes one MBS zone.

Second, the multicast scheme and the broadcast scheme will be described below. According to the multicast scheme, the base station determines the current state of the terminals using the MBS, and generates and transmits an MBS signal by applying Adaptive Modulation and Coding (AMC) according to the worst channel condition. Accordingly, the base station should allocate a Channel Quality Informatin (CQI) channel for channel information feedback to each of the terminals using the MBS, which causes a limitation of the number of serviceable terminals. On the other hand, when the broadcast method is used, the base station generates and transmits an MBS signal according to a mudulation and coding scheme (MCS) level determined based on a cell edge. In this case, the base station does not grasp the current status of the terminals using the MBS, and does not apply AMC. Accordingly, since the CQI channel is not allocated, it is possible to remove the limitation of the number of serviceable terminals due to the CQI channel allocation.

Third, the dynamic method and the static method will be described below. According to the dynamic method, the base station determines the existence of the terminal using the MBS, and transmits the MBS signal according to the existence of the terminal. That is, when there is no terminal using the MBS, the base station stops transmitting the MBS signal. On the other hand, in the static scheme, the base station continuously transmits the MBS signal regardless of the presence or absence of the terminal using the MBS.

As mentioned above, MBS is classified into various types according to the implementation manner. However, no systematic scheme for supporting the above-mentioned various types of MBS is presented. Therefore, an alternative for MBS type recognition and system operation suitable for each type should be presented.

Accordingly, an object of the present invention is to provide an apparatus and method for supporting different types of multicast and broadcast services (hereinafter referred to as MBS) in a broadband wireless communication system. .

Another object of the present invention is to provide an apparatus and method for notifying the MBS type for each MBS zone ID in a broadband wireless communication system.

Another object of the present invention is to provide an apparatus and method for grouping MBS broadcast channels according to characteristics in a broadband wireless communication system.

According to a first aspect of the present invention for achieving the above object, a broadband wireless communication system providing a multicast and broadcast service (MBS), MBS server for classifying the MBS type (target) type (MBS) for the MBS zone (zone) And a base station for transmitting MBS type information of the MBS zone to which the mobile station belongs, and a terminal for checking the type of the MBS zone to which it belongs using the MBS type information.

According to a second aspect of the present invention for achieving the above object, a broadband wireless communication system providing an MBS, MBS performing a transmission group classification according to the characteristics of the MBS broadcast channel for the MBS broadcast channels provided in the MBS zone A server, a base station for transmitting information on each transmission group and an MBS map (MAP) message for each transmission group, and a terminal for identifying a location of an MBS data burst using the MBS map message. .

According to a third aspect of the present invention for achieving the above object, in a broadband wireless communication system providing an MBS, the MBS server apparatus includes a first classification unit for classifying MBS types for MBS zones, and MBS type information. And an allocation unit for generating MBS zone IDs and assigning the MBS zone IDs to each of the MBS zones.

According to a fourth aspect of the present invention for achieving the above object, in a broadband wireless communication system providing an MBS, a base station apparatus includes: an allocation unit for allocating an MBS region of a fixed position in a frame to each transmission group; A processing unit for generating independent MBS map messages for each group. And a communication unit for transmitting the MBS map message and the MBS data burst.

According to a fifth aspect of the present invention for achieving the above object, in a broadband wireless communication system providing an MBS, the terminal apparatus checks the MBS type of the serving base station using the MBS zone ID, and then includes the MBS map message. A processor that checks transmission period information of a corresponding transmission group using next MBS frame offset information, and referring to location information of an MBS data burst identified using the MBS map message, It characterized in that it comprises a communication unit for decoding the signal.

In a broadband wireless communication system, an effective MBS can be provided by managing a service for each type of multicast and broadcast service (hereinafter referred to as MBS) and for each group based on MBS broadcast channel characteristics.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, the present invention will be described for a technique for supporting various types of multicast and broadcast services (Multicast and Braodcast Service, hereinafter referred to as 'MBS') in a broadband wireless communication system. Hereinafter, the present invention will be described using an Orthogonal Frequency Division Multiple Access (hereinafter referred to as "OFDMA") wireless communication system as an example, and may be equally applicable to other wireless communication systems.

2 is a schematic diagram of a wireless communication system providing an MBS according to the present invention. Referring to FIG. 2, the wireless communication system includes a terminal 210, a base station 220, a control station 230, an authentication server 240, a system management server 250, an MBS server 260, and a content providing server ( 270).

The terminal 210 is a user terminal, a consumer of MBS, and receives an MBS signal through a wireless channel. The base station 220 performs wireless communication with the terminal 210 through a wireless interface conforming to a physical layer of the wireless network and a media access control (MAC) layer standard, and manages connection of the wireless section of the terminal. The control station 230 manages the connection and mobility of the terminal 210 and allocates a unique service flow for each uplink (UL) and downlink (DL). . In addition, the control station 230 provides the terminal 210 with an interface with the core network to pass through to communicate with the authentication server 240, the MBS server 260 and the like.

The authentication server 240 manages authentication and charging information of the terminal 210. The authentication server 240 may include a subscription profile repository (SPR) function for managing profile information for each subscriber. In addition, the authentication server 240 may manage the broadcast service authorization information for each subscriber, the security key derived from the initial authentication process, and the lifetime information. The system management server 250 provides a function for the maintenance and repair of the control station 230 and the base station 220 to the radio access network manager. In addition, the system management server 250 provides PLD (Program Loading Data) to the control station 230 and the base station 220 at the time of initializing the control station 230 and the base station 220.

The MBS server 260 has an interface with the content providing server 270 and the authentication server 240, and transmits the actual broadcast traffic and MBS zone management information to the control station 230, the content The service authorization key and service guide information for each star are transmitted to the terminal 210. In addition, the MBS server 260 configures an MBS zone, and performs MBS zone ID, MCID (MBS Connection ID), LCID (Logical Connection ID), content ID, and broadcast channel IP allocation and management. In addition, the MBS server 260 may perform air scheduling, that is, permutation, modulation and coding scheme (MCS) level, multiple input multiple output (MIMO) technology, transmission rate, and transmission. Period, compression, and broadcast start / end time information are transmitted to the control station 230. Here, the wireless scheduling method information, MBS zone ID, MCID, LCID, broadcast channel IP, content ID transfer function may be performed by the system management server 250. The content providing server 270 is a server having multimedia content serviced through MBS, and provides broadcast content to the MBS server 260.

Referring to the features of the broadband wireless communication system providing an MBS according to the present invention based on the configuration shown in Figure 1 as follows.

First, the system classifies the MBS type for each MBS zone, and displays the MBS type of the MBS zone by using the inside of the MBS zone ID or additional information.

That is, the MBS server 260 performs macro diversity on MBS zones, whether to apply Adaptive Modulation and Coding (AMC), and whether to control MBS signal transmission according to the presence of a terminal using MBS. Classify the MBS type accordingly. The base station 220 informs the terminal of the MBS type of the MBS zone by using the MBS zone ID or other information.

The MBS zone ID is generated by the MBS server 260 and is information transmitted through a broadcast message or a MAC message. For example, the broadcast message that may include the MBS zone ID may include an MBS map Information Element (IE), a Downlink Channel Descriptor (DDC) message, a NBR ADV (NeighBoR ADVertisement) message, and the like. MAC messages present are Dynamic Service Addition (DSA) messages, Dynamic Service Change (DSC) messages, and the like.

When the MBS type is indicated using one bit, the MBS server 260 generates an MBS zone ID capable of distinguishing a multiple base station method and a single base station broadcast method using the one bit. In this case, for the single base station broadcast scheme, the DIUC is fixed to Quadrature Phase Shift Keying (QPSK) 1/12, and MBS level information of the MBS signal is not included in the MBS map IE, the DCD message, and the MBS data IE.

When the MBS type is indicated using two bits, the MBS server 260 uses the two bits to identify an MBS zone ID that can distinguish a multiple base station scheme, a single base station broadcast scheme, and a single base station multicast scheme. Create

When the MBS type is indicated using three bits, the MBS server 260 generates an MBS zone ID that can distinguish the schemes as shown in Table 1 using the three bits.

 value  MBS type 000  reserved 001  Multi base station method 010  Single Base Station Broadcast Static 011  Single Base Station Broadcast Dynamics 100  Single Base Station Multicast Static 101  Single Base Station Multicast Dynamics 110  Multiple base station or single base station broadcast dynamics (optional) 111  Multiple base station or single base station multicast dynamic method (optional)

In Table 1, the options for multicast / broadcast and dynamic / static are not included for the multiple base station scheme. Although there are multiple base station schemes combining multicast / broadcast and dynamic / static, the present invention only considers multiple base station schemes, broadcast static schemes, and broadcast dynamic schemes.

Second, the system performs transmission group classification for the content broadcasting channels and displays the number of transmission groups included in the MBS zone by using the inside of the MBS zone ID or additional information. Here, the number of transmission groups is notified by the operator through the MBS server 260 or the system management server 250.

The transmission group is a set of MBS broadcast channels having the same transmission start frame and the same transmission period in one MBS zone. In addition to the two conditions listed above, as a third condition, a wireless scheduling scheme may be optionally added. This is because, in the case of a single base station multicast scheme, even though the transmission frame has the same transmission start frame and the same transmission period, radio scheduling (eg, permutation, MBS level) may be different for each base station. Accordingly, the MBS server 260 classifies a plurality of MBS broadcast channels by transmission group according to at least one of a transmission start frame, a transmission period, and a wireless scheduling scheme.

At this time, the terminal 210 using the MBS should obtain period information for each transmission group. In general, when the periodic information for each transmission group is transmitted using next MBS frame offset information having an 8-bit size included in an MBS map message, the base station 220 may deliver 256 period information. This means that 256 transport groups can be supported. However, for efficient management, the number of transmission groups is preferably four to eight.

Third, the system displays information of the corresponding transmission group using the MBS map IE, the MBS map message, the DSA message, the DAC message, or the separate information.

That is, the base station 220 includes transmission group information corresponding to the MBS broadcast channel to be added or changed in the DSA message and the DSC message. In addition, the MBS map IE includes information on a transmission group corresponding to the MBS map message indicated by the MBS map IE. In this case, the information on the transmission group included in the MBS map IE may be in the form of the next MBS map IE frame offset information. MBS map IE according to an embodiment of the present invention is shown in Table 2 below.

 Multi base station method  Single base station broadcast method-A  Single base station broadcast method-B E-DIUC E-DIUC E-DIUC Length Length Length MBS_Zone ID MBS_Zone ID MBS_Zone ID Permutation Permutation DIUC Symbol offset Symbol offset CID Boosting Boosting OFDMA Symbol Offset DIUC DIUC Subchannel Offset # of subchannels # of subchannels Boosting # of OFDMA Symbols # of OFDMA Symbols SLC_3_indication (if set, Next MBS_MAP_IE Frame offset) Repetition Coding Indication # of OFDMA Symbols # of Subchannels Repetition Coding Indication

Referring to Table 2, the 'DIUC change Ind' field, which is generally included, is not included in the MBS map IE according to the embodiment of the present invention. In addition, in the system according to the present invention, the 'DL PermBase' field and the 'PRBS_ID' field, which are generally included, are designed to be fixed to a specific value for each MBS zone, and may have different values to avoid interference between different MBS zones. have. In this case, the operator sets the values of the 'DL PermBase' field and the 'PRBS_ID' field through the MBS server 260 or the system management server 250. Accordingly, in the multiple base station method, the 'DL PermBase' field and the 'PRBS_ID' field are displayed in DCD and NBR_ADV (NeighBoR ADVertisement) in units of MBS zones or are included once in an MBS map ID or MBS map message. In particular, in the case of a single base station method, values expressed using a 'DL PermBase' field and a 'PRBS_ID' field are applied in the same manner as values applied to a preamble.

Fourth, the system allows each transmission group to have a fixed MBS area within a frame.

That is, the base station 220 allocates resources such that MBS data bursts of a specific transmission group exist in a fixed area within a frame of a corresponding period. In general, MBS data IE included in the MBS map message includes information indicating a location of a next MBS map message, that is, frame offset information, OFDMA symbol offset information, OFDMA symbol number information, and OFDMA of a frame including the next MBS map. Subchannel number information is included. However, since each transmission group has a fixed location of the MBS area, the MBS data IE according to an embodiment of the present invention does not include information indicating the location of the next MBS map message. In this case, for convenience of the terminal, the base station 220 may include information indicating the location of the next MBS map message in the field except for the MBS data IE in the MBS map message.

Fifth, the system processes the MBS map message and the MBS data burst included in the same transmission group as one region in the frame.

In the other schemes except the multicast scheme, since the MBS data bursts in one MBS region are all subjected to the same permutation and MBS level, the radio scheduling scheme information included in the MBS map IE is applied to the MBS data bursts in the MBS region. The same applies to. In this case, for the convenience of the terminal, the base station 220 may include the radio scheduling scheme information only once without overlapping the MBS map message. Alternatively, the base station 220 may transmit the radio scheduling method information only through the DCD message. For this reason, each of the MBS data IEs according to an embodiment of the present invention does not include radio scheduling scheme information. In addition, since the MBS map message and the MBS data burst are processed as one region, the MBS data burst is padded in the first transmitted MBS region, ie, empty, and the MBS map in the last transmitted MBS region. The message contains meaningless information.

Sixth, the system configures a service guide channel for guiding the MBS broadcast channel into a separate transmission group, or includes it in each transmission group at regular intervals.

When the service guide channel is configured as a separate transmission group, the MBS server 260 sets the service guide channel as the first transmission group of all MBS zones. In addition, when the service guide channel is included in each transmission group at a predetermined period, the MBS server 260 considers the overhead (overhead) in consideration of the overhead (long period (eg 256 frame period)) each transmission group Include it in Here, the information transmitted through the service guide channel is information of MBS broadcast channels included in a corresponding transmission group, or information of all MBS broadcast channels valid in a corresponding MBS zone. For example, the information of the MBS broadcast channels is whether the MCID or LCID, which is the MAC layer name tag corresponding to each MBS broadcast channel, is valid only in the current MBS zone, is valid in all MBS zones, or multiple MBSs. It contains information about whether it is valid in the zones and what MBS zones the MAC layer name tag of the current MBS zone is valid if it is valid in multiple MBS zones. The information on the MBS broadcast channels includes information on whether each MBS broadcast channel is compressed and encrypted.

Seventh, the system applies call processing differently according to the MBS type.

In the case of the multi-base station method, the channel that requires additional charging cannot control whether the terminal receives the broadcast through the DSA procedure or the DSC procedure, so that the MBS server 260 receives the broadcast using the authentication key. To control. That is, the MBS server 260 delivers an authentication key necessary for traffic decryption only to a terminal having a broadcast reception qualification. In this case, the authentication key is transmitted through the DSA procedure or the DSC procedure between the terminal 210 and the base station 220.

In the case of a single base station broadcast scheme, the MBS server 260 delivers the MCID to the terminal 210 through an application layer in order to support the idle mode broadcast reception to the terminal. This is because the UE in the idle mode cannot perform the DSA procedure or the DSC procedure.

In the case of a single base station multicast scheme, the terminal 210 and the base station 220 establish a broadcast call through a DSA procedure or a DSC procedure.

Eighth, the system applies a wireless scheduling scheme differently according to the MBS type.

In the case of the multiple base station method, AMC is not applied, and the MBS signal is transmitted regardless of the presence or absence of the terminal using the MBS. Accordingly, resource reservation and resource allocation are performed simultaneously, and the MAC layer name tag is assigned by the MBS server 260.

In the case of a single base station broadcast static scheme, AMC is not applied, and an MBS signal is transmitted regardless of whether a terminal using MBS exists. In addition, to support idle mode broadcast reception, the terminal acquires the MAC layer name tag through the application layer. The MAC layer name tag is assigned by the MBS server 260 or the control station 230. However, if the MAC layer name tag is assigned by the control station 230, the terminal must perform the DSA procedure or DSC procedure to obtain the MAC layer name tag.

In the case of a single base station broadcast dynamic scheme, AMC is not applied, and an MBS signal is transmitted only when a terminal using MBS exists. In addition, to support idle mode broadcast reception, the terminal acquires the MAC layer name tag through the application layer. The existence of the terminal using the MBS is confirmed by having the terminal perform an IGMP join to the MBS server 260 or another network object that manages the IGMP group before the broadcast starts. If the terminal moves at the start of the MBS broadcast after the application, if the paging group (paging group) does not change, it is difficult to know where the idle mode terminal is, it is difficult to determine whether there is a terminal using the MBS in the correct specific base station.

In the case of a single base station multicast dynamic scheme, AMC is applied and an MBS signal is transmitted according to the presence or absence of a terminal using the MBS. Thus, if a resource is reserved but no MBS signal is transmitted, the resource is not allocated. The MCID is assigned by the MBS server 260 or the control station 230. However, if the MCID is assigned by the control station 230, the terminal should perform the DSA procedure or DSC procedure to obtain the MAC layer name tag. And, if the MCID is assigned by the MBS server 260, since the same MCID can be assigned in different cells for the same channel, seamless service is guaranteed. On the other hand, when the MCID is assigned by the control station 230, the control station 230 must separately manage the mapping information of the transmission group and the MCID (mapping) and at the same time allocate the MCID through the DSA or DSC procedure. In addition, when a TCID (Traffic Connection ID) is used, the UE acquires a TCID by performing a DSA procedure or a DSC procedure with a base station.

3 is a block diagram of the MBS server 260 in a broadband wireless communication system according to an exemplary embodiment of the present invention.

As shown in FIG. 3, the MBS server 260 includes an MBS type classification unit 302, a transmission group classification unit 304, a zone ID assignment unit 306, an MCID management unit 308, and a service guide generation unit. It comprises a 310, the communication unit 312, the control unit 314.

The MBS type classification unit 302 classifies MBS types for MBS zones. The MBS type is classified according to at least one criterion of whether macro diversity is performed, whether AMC is applied, or whether MBS signal transmission is controlled according to the presence or absence of a terminal using MBS. The transmission group classification unit 304 performs transmission group classification for MBS broadcasting channels in each MBS zone. The transmission group is classified according to at least one of a transmission start frame, a transmission period, and a wireless scheduling scheme. The zone ID assigning unit 306 generates an MBS zone ID including MBS type information determined by the MBS type classification unit 302, and allocates an MBS zone ID to each MBS zone. However, according to another embodiment of the present invention for transmitting the MBS type information, the MBS zone ID may not include the MBS type information. The MCID management unit 308 manages the MCID corresponding to each of the MBS broadcast channels, and allocates the MCID to the terminal that wants to consume the MBS broadcast.

The service guide generator 310 generates content of a service guide channel for guiding an MBS broadcast channel. The content of the service guide channel is determined whether the MCID or LCID, which is the MAC layer name tag corresponding to each MBS broadcast channel, is valid only in the current MBS zone, is valid in all MBS zones, or is valid in multiple MBS zones. If valid in the MBS zones of the current MBS zone MAC layer name tag includes information on what MBS zones are valid. The content of the service guide channel includes information on whether each channel is compressed and encrypted. In this case, the service guide channel is classified into a transport group by the transport group classification unit 304. According to an embodiment of the service guide channel, the transport group classification unit 304 configures the service guide channel into a separate and independent transport group, or assigns the service guide channel to each of the other transport groups. Include at regular intervals.

The communication unit 312 provides an interface for communicating with other network entities (NEs) in the system through a backbone network. The controller 314 performs overall control of the MBS server 260. For example, the control unit 314 may include MBS type information of each MBS zone classified by the MBS type classification unit 302, transmission group information of each MBS zone classified by the transmission group classification unit 304, The MBS zone ID of each MBS zone allocated by the zone ID assigning unit 306, the MCID assigned to the terminal by the MCID managing unit 308, and the like are transmitted to other network objects. In addition, the control unit 314 provides MBS type information of each MBS zone classified by the MBS type classification unit 302 to the zone ID assignment unit 306.

4 is a block diagram of a base station 220 in a broadband wireless communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 4, the base station 220 includes a message processing unit 402, a resource allocation unit 404, a backbone communication unit 406, a wireless communication unit 408, and a control unit 410.

The message processor 402 interprets and generates a control message exchanged with a terminal through a wireless channel. For example, the message processor 402 generates a downlink map message including an MBS map IE and an MBS map message indicating a location of an MBS data burst. In particular, according to the present invention, the message processing unit 402 refers to the transmission group classification information classified by the MBS server 260, and generates an independent MBS map message for each transmission group. The message processing unit 402 generates an MBS map message including transmission location information of the next MBS map message in one of the remaining fields except the MBS data burst IE field. However, the MBS map message and the next MBS map message are map messages for the same transmission group. In addition, in order to provide the UE with the wireless scheduling scheme information of the MBS data burst, the message processing unit 402 includes the MBS map burst information of the MBS data burst in one of the remaining fields except the MBS data burst IE field. Create a message. Alternatively, according to another embodiment for providing wireless scheduling information of the MBS data burst to the terminal, the message processing unit 402 generates a DCD message including the wireless scheduling information of the MBS data burst. However, according to some embodiments of the present disclosure, the message processing unit 402 does not generate a separate message including wireless scheduling scheme information of the MBS data burst.

The resource allocating unit 404 allocates radio resources for MBS to the terminal. For example, the resource allocator 404 allocates an MBS region for transmitting an MBS signal in a frame. In particular, according to the present invention, the resource allocating unit 404 refers to the transmission group classification information classified by the MBS server 260, and assigns each transmission group an MBS region of a fixed position in a frame. . In addition, the resource allocator 404 allocates the MBS map message and the MBS data burst for the same transmission group in one region in the frame.

The backbone communication unit 406 provides an interface for communicating with other network objects in the system through a backbone network. The wireless communication unit 408 provides an interface for communicating with a terminal through a wireless channel. For example, the wireless communication unit 408 performs encoding, modulation, inverse fast fourier transform (IFFT) operation, and radio frequency (RF) up-conversion on the transmission data, and then transmits a signal through an antenna. In particular, according to the present invention, the wireless communication unit 408 applies the same wireless scheduling scheme to the MBS map message and the MBS data burst included in the same transmission group.

The controller 410 performs overall control of the base station 220. The control unit 410 obtains MBS zone ID information, transmission group classification information, MBS type information, etc. determined by the MBS server 260, and obtains the obtained information from the message processor 402 and the resource allocator 404. )

5 is a block diagram of a terminal in a broadband wireless communication system according to an exemplary embodiment of the present invention.

As shown in FIG. 5, the terminal 210 includes a message processing unit 502, a wireless communication unit 504, and a control unit 506.

The message processor 502 interprets and generates a control message exchanged with a base station through a wireless channel. For example, the message processor 502 confirms the location of the MBS map message by interpreting the MBS map IE included in the downlink map message, and confirms the location of the MBS data burst by interpreting the MBS map message. In particular, according to the present invention, the message processor 502 checks the MBS type of the serving base station using the MBS zone ID. In addition, the message processor 502 checks transmission period information of a corresponding transmission group by interpreting next MBS frame offset information included in an MBS map message. The message processor 502 checks the transmission location information of the next MBS map message using one of the remaining fields except the MBS data burst IE field. However, the MBS map message and the next MBS map message are map messages for the same transmission group. Also, in order to confirm the wireless scheduling scheme information of the MBS data burst, the message processor 502 checks the wireless scheduling scheme information of the MBS data burst using one of the remaining fields except for the MBS data burst IE field. Alternatively, according to another embodiment for confirming the wireless scheduling scheme information of the MBS data burst, the message processor 502 checks the wireless scheduling scheme information of the MBS data burst using a DCD message. However, according to some embodiments of the present disclosure, the message processing unit 502 does not separately check radio scheduling information of the MBS data burst.

The wireless communication unit 504 provides an interface for communicating with a base station through a wireless channel. For example, the wireless communication unit 502 restores an information bit string by performing baseband down-conversion, fast fourier transform (FFT) operation, demodulation, and decoding on a signal received through an antenna. The wireless communication unit 502 needs to know a wireless scheduling method of the MBS data burst in order to convert the signal of the MBS data burst into an information bit string. To this end, the wireless communication unit 502 obtains wireless scheduling information of the MBS data burst from the control unit 506. Thereafter, the wireless communication unit 502 decodes the signal of the MBS data burst by referring to the location information of the MBS data burst confirmed by the message processing unit 502.

The controller 506 performs overall control of the terminal 210. That is, the controller 506 classifies a control message among the bit strings received from the base station and provides the message to the message processor 502. In addition, the controller 506 provides the wireless communication unit 504 with wireless scheduling information of the MBS data burst and location information of the MBS region obtained according to an embodiment of the present invention. According to an embodiment for providing the wireless scheduling method information of the MBS data burst to the wireless communication unit 504, the controller 506 may use the wireless scheduling method information of the MBS data burst confirmed by the message processing unit 502. The wireless communication unit 504 is provided. According to another embodiment for providing the wireless scheduling method information of the MBS data burst to the wireless communication unit 504, the controller 506 may be configured to provide the wireless scheduling method information of the MBS map message included in the MBS map IE. The wireless scheduling method information of the burst is provided to the wireless communication unit 504. In addition, the controller 506 controls to receive an MCID from the MBS server 260 through an application layer in order to receive traffic of an MBS broadcast channel. In addition, the control unit 506 provides the position information of the MBS data burst confirmed by the message processing unit 502 to the wireless communication unit 504, the bit string of the MBS data burst provided from the wireless communication unit 504 Is handled by the application layer.

6 illustrates an operation procedure of the MBS server 260 in a broadband wireless communication system according to an embodiment of the present invention.

Referring to FIG. 6, the MBS server 260 classifies MBS types for MBS zones in step 601. The MBS type is classified according to at least one criterion of whether macro diversity is performed, whether AMC is applied, or whether MBS signal transmission is controlled according to the presence or absence of a terminal using MBS.

In step 603, the MBS server 260 generates an MBS zone ID including the MBS type information determined in step 601, and allocates an MBS zone ID to each MBS zone. However, according to another embodiment of the present invention for transmitting the MBS type information, the MBS zone ID may not include the MBS type information.

In step 605, the MBS server 260 generates content of a service guide channel. The content of the service guide channel is determined whether the MCID or LCID, which is the MAC layer name tag corresponding to each MBS broadcast channel, is valid only in the current MBS zone, is valid in all MBS zones, or is valid in multiple MBS zones. If valid in the MBS zones of the current MBS zone MAC layer name tag includes information on what MBS zones are valid. The content of the service guide channel includes information on whether each channel is compressed and encrypted.

In step 607, the MBS server 260 performs transmission group classification for MBS broadcasting channels in each MBS zone. The transmission group is classified according to at least one of a transmission start frame, a transmission period, and a wireless scheduling scheme. In this case, according to an embodiment of the present invention for the service guide channel, the MBS server 260 configures the service guide channel into a separate and independent transport group, or the service guide channel to another Include each of the transmission groups at regular intervals.

In step 609, the MBS server 206 allocates the MCID according to the MBS broadcast channel reception request of the terminal.

7 illustrates an operation procedure of the base station 220 in a broadband wireless communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 7, the base station 220 obtains its MBS zone ID, MBS type, and transmission group classification information in step 701. In this case, according to an embodiment of the present invention, the MBS type information is obtained in a form included in the MBS zone ID or in a separate form of information.

In step 703, the base station 220 allocates an MBS region of a fixed position to each transmission group by referring to the transmission group classification information. In addition, the base station 220 allocates the MBS map message and the MBS data burst for the same transmission group in one region in the frame.

In step 705, the base station 220 generates a downlink map and an MBS map message including the MBS map IE. At this time, the base station 220 generates an independent MBS map message for each transmission group by referring to the transmission group classification information. The base station 220 generates an MBS map message including transmission location information of the next MBS map message in one of the remaining fields except the MBS data burst IE field. However, the MBS map message and the next MBS map message are map messages for the same transmission group. In addition, in order to provide the UE with the scheduling information of the MBS data burst, the base station 220 includes the MBS map message including the scheduling information of the MBS data burst in one of the remaining fields except the MBS data burst IE field. Create Alternatively, according to another embodiment for providing wireless scheduling information of the MBS data burst to the terminal, the base station 220 generates a DCD message including the wireless scheduling information of the MBS data burst. However, according to some embodiments of the present disclosure, the base station 220 does not generate a separate message including information on the radio scheduling scheme of the MBS data burst.

Thereafter, the base station 220 transmits the downlink map, the MBS map message, and the MBS data burst. In this case, the base station 220 applies the same radio scheduling scheme to the MBS map message and the MBS data burst included in the same transmission group.

8 is a flowchart illustrating an operation procedure of the terminal 210 in a broadband wireless communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 8, the terminal 210 determines the location of the MBS map message by analyzing the MBS map IE included in the downlink map in step 801.

After confirming the location of the MBS map message, the terminal 210 proceeds to step 803 to interpret the MBS map message, thereby confirming the location of the MBS data burst. At this time, the terminal 210 checks the transmission period information of the corresponding transmission group by interpreting the next MBS frame offset information included in the MBS map message. The terminal 210 checks transmission location information of the next MBS map message using one of the remaining fields except for the MBS data burst IE field. However, the MBS map message and the next MBS map message are map messages for the same transmission group.

In step 805, the terminal 210 checks a wireless scheduling scheme of the MBS data burst. For example, the terminal 210 checks the wireless scheduling scheme information of the MBS data burst using one of the remaining fields except the MBS data burst IE field. Alternatively, according to another embodiment for confirming wireless scheduling scheme information of the MBS data burst, the terminal 210 confirms wireless scheduling scheme information of the MBS data burst using a DCD message. However, according to some embodiments of the present disclosure, the terminal 210 does not separately check radio scheduling scheme information of the MBS data burst, and step 805 is omitted.

In step 807, the terminal 210 decodes the MBS data burst with reference to the location information of the MBS data burst identified in step 803 and the wireless scheduling method of the MBS data burst identified in step 805. By doing so, the bit string is converted. In this case, if the wireless scheduling method information of the MBS data burst is not checked in step 805, the terminal 210 is the same as the wireless scheduling method of the MBS map message checked through the MBS map IE. The MBS data burst is processed according to a wireless scheduling scheme.

In step 809, the terminal 210 processes the bit string of the MBS data burst in an application layer.

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 determined not only by the scope of the following claims, but also by the equivalents of the claims.

FIG. 1 is a diagram illustrating a general radio resource usage example for providing a multicast and broadcast service (hereinafter, referred to as MBS) in a broadband wireless communication system.

2 is a diagram showing a schematic configuration of a broadband wireless communication system providing an MBS according to the present invention;

3 is a block diagram of an MBS server in a broadband wireless communication system according to an embodiment of the present invention;

4 is a block diagram of a base station in a broadband wireless communication system according to an embodiment of the present invention;

5 is a block diagram of a terminal in a broadband wireless communication system according to an embodiment of the present invention;

6 is a diagram illustrating an operation procedure of an MBS server in a broadband wireless communication system according to an embodiment of the present invention;

7 is a flowchart illustrating an operation procedure of a base station in a broadband wireless communication system according to an embodiment of the present invention;

8 is a diagram illustrating an operation procedure of a terminal in a broadband wireless communication system according to an embodiment of the present invention.

Claims (25)

In a broadband wireless communication system providing a multicast and broadcast service (MBS), An MBS server for classifying MBS types for MBS zones, A base station for transmitting MBS type information of the MBS zone to which it belongs to the terminal; And a terminal for identifying the type of the MBS zone to which it belongs by using the MBS type information. The method of claim 1, The MBS type information is an MBS zone ID (IDentifier) including an MBS type identifier. The method of claim 1, The MBS type is classified according to at least one criterion of whether to perform macro diversity, whether to apply adaptive modulation and coding (AMC), or to control MBS signal transmission according to the presence or absence of a terminal using MBS. System characterized. The method of claim 1, The MBS server is a system characterized in that for controlling the broadcast reception of the terminal using the authentication key for the MBS broadcast channel, which is serviced in a multiple base station method and requires an additional charge. The method of claim 1, The MBS server, the system characterized in that for assigning an MBS Connection IDentifier (MCID) through the application layer. The method of claim 1, The base station, when included in the multiple base station MBS zone, characterized in that to perform the resource reservation and resource allocation for transmitting the MBS signal at the same time. In a broadband wireless communication system providing a multicast and broadcast service (MBS), An MBS server that performs transmission group classification based on the characteristics of the MBS broadcast channel for the MBS broadcast channels provided in the MBS zone; A base station transmitting information on each transmission group and MBS map (MAP) message for each transmission group; And a terminal for identifying a location of an MBS data burst using the MBS map message. The method of claim 7, wherein The MBS server, the system characterized in that for performing the transmission group classification according to at least one of the transmission start frame, transmission period, air scheduling (air scheduling) method. The method of claim 8, The terminal checks transmission period information of a corresponding transmission group by checking next MBS frame offset information included in an MBS map message. The method of claim 7, wherein The base station uses the at least one message of MBS Map Information Element (IE), MBS Map message, Dynamic Service Addtion (DSA) message, Dynamic Service Change (DSC) message to the UE. Transmitting system. The method of claim 7, wherein And the base station allocates each transmission group an MBS region of a fixed position in a frame. The method of claim 11, The base station, characterized in that for transmitting the transmission location information of the next MBS map message to the terminal using one of the remaining fields in the MBS map message except the MBS data burst IE field. The method of claim 7, wherein And the base station includes the MBS map message and the MBS data burst of the same transmission group in one MBS region, and applies the same radio scheduling scheme to the MBS map message and the MBS data burst. The method of claim 13, And the terminal processes the MBS data burst according to the same wireless scheduling scheme as that of the MBS map message identified using the MBS map IE of the downlink map message. The method of claim 13, The base station, characterized in that for transmitting the radio scheduling information of the MBS data burst to the terminal using one of the remaining fields in the MBS map message except the MBS data burst IE field. The method of claim 13, The base station, characterized in that for transmitting the radio scheduling information of the MBS data burst to the terminal using a Downlink Channel Descriptor (DDC) message. The method of claim 7, wherein The MBS server configures a service guide channel for guiding MBS broadcast channels into a separate independent transport group, and sets a transport group including the service guide channel as the first transport group of each MBS zone. System characterized in that. The method of claim 7, wherein The MBS server, characterized in that to periodically include a service guide channel for the MBS broadcast channel guidance in each transmission group. An MBS server device in a broadband wireless communication system that provides MBS (Multicast and Broadcast Service), A first classification unit classifying the MBS type for the MBS zones; And an allocator configured to generate MBS zone IDs including MBS type information and to assign the MBS zone IDs to each of the MBS zones. The method of claim 19, And a second classifier configured to classify the MBS broadcast channels according to at least one of a transmission start frame, a transmission period, and a wireless scheduling method for the MBS broadcast channels in each MBS zone. Device. A base station apparatus in a broadband wireless communication system providing a multicast and broadcast service (MBS), An allocating unit for allocating each transmission group an MBS area of a fixed position in a frame; A processing unit for generating an independent MBS map (MAP) message for each transmission group. And a communication unit for transmitting the MBS map message and the MBS data burst. The method of claim 21, The allocation unit allocates the MBS map message and the MBS data burst for the same transmission group in one region in a frame. And the communication unit applies the same air scheduling scheme to the MBS map message and the MBS data burst included in the same transmission group. A terminal device in a broadband wireless communication system providing a multicast and broadcast service (MBS), Check the MBS type of the serving base station by using the MBS zone ID (IDentifier), and transmit the corresponding transmission group by using the next MBS frame offset information included in the MBS map (MAP) message. A processing unit for checking the cycle information, And a communication unit for decoding a signal of the MBS data burst by referring to the location information of the MBS data burst identified using the MBS map message. The method of claim 23, wherein The communication unit is characterized in that for processing the signal of the MBS data burst in accordance with the same wireless scheduling scheme as the air scheduling (air scheduling) applied to the MBS map message. The method of claim 24, And a control unit for providing wireless communication scheme information of the MBS map message included in the MBS map Information Element (IE) of the downlink map to the communication unit as wireless scheduling scheme information of the MBS data burst.

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