KR20110023800A - Method of transmitting multicast broadcast service - Google Patents

Abstract

PURPOSE: A transmitting method of a multicast broadcast service is provided to effectively and continuously manage an MBS in a mobile wireless connection system supporting the MBS. CONSTITUTION: MBS setting information including information about MBS MAP and information about MBS area, which MBS related information is allocated, is transmitted to a terminal(S100~S110). MBS data is transmitted to the terminal through MBS area. Information about the MBS area includes location information of the MBS area and a transmission parameter. MBS setting information change director directs whether the MBS setting information is converted from a first MBS setting information into a second MBS setting information.

Description

Transmission method of multicast broadcast service {METHOD OF TRANSMITTING MULTICAST BROADCAST SERVICE}

The present invention relates to wireless communication, and more particularly, to a transmission method and a reception method of a multicast broadcast service.

Multicast / Broadcast Service (MBS) is a point-to-multipoint communication system that simultaneously transmits data packets from one source to multiple destinations. to be. The broadcast service refers to a service transmitted to all users, and the multicast service refers to a service transmitted to a specific group. MBS is used in IEEE 802.16e, one of mobile communication standards, and is called Multicast BroadCast Service (MCBCS) in WiMAX. The term Evolved-MBS (E-MBS) is used in IEEE 802.16m, an evolutionary standard from IEEE 802.16e. Meanwhile, in the WCDMA standard of 3rd Generation Partnership Project (3GPP), Rel. A standard called Multimedia Broadcast Multicast Service (MBMS) was created in 5, and after Rel. 8 called Long Term Evolution (LTE), it is called E-MBMS (Evolved MBMS). Although the terms used for each standard vary slightly, all of them are actively being standardized with the goal of providing broadcast communication convergence services.

1 shows a frame structure for transmitting MBS data.

Referring to FIG. 1, a radio frame is configured in units of superframes, and one superframe is composed of four frames. Each frame is composed of a plurality of subframes. The first subframe of each superframe includes a Superframe Header (SFH). The SFH is a unit in which several frames are transmitted, and mainly includes essential system parameters or system configuration information. The SFH includes a primary superframe header (P-SFH) and may periodically include a secondary superframe header (S-SFH). P-SFH is transmitted mainly every superframe. The P-SFH defines whether or not the S-SFH is transmitted or not and is transmitted in one or more superframe periods.

MBS has a specific Quality of Service (QoS) and one service flow, which are mapped and provided to multiple terminals at the same time. The terminal receiving the MBS sets the corresponding parameter and the service flow in order to receive the corresponding service. The base station providing the MBS belongs to at least one MBS zone and is identified by the MBS zone ID. In each MBS zone, common content is divided into multicast STIDs (hereinafter referred to as E-MBS IDs) and transmitted using a service flow. The E-MBS ID is a common ID assigned to the UE for MBS service, and each MBS content has the same channel (or service flow ID; FID). The FID exists in pairs with the corresponding E-MBS ID for each MBS connection.

One terminal may be assigned with multiple FIDs, and MBS contents belonging to one E-MBS ID are transmitted by being distinguished by FID. In the MBS zone, the user must receive the MBS regardless of whether the user is in a connected state or idle mode. This means that no additional registration or procedure is necessary to receive the MBS. In addition, when the terminal moves from one MBS zone to another MBS zone, the terminal should continuously receive the MBS regardless of the mode of the terminal.

Considering the MBS-specific frame structure and various parameters, a detailed description of a frame structure, a control channel structure, and a MAP message is required to efficiently transmit the MBS.

An object of the present invention is to efficiently provide an MBS through a design of an efficient MBS frame, a control channel structure, and an MBS MAP message for providing an MBS.

According to an aspect of the present invention, there is provided a method for transmitting a multicast broadcast service (hereinafter referred to as MBS) by a base station. The method includes transmitting MBS configuration information including information on an MBS region, which is a resource region to which MBS related information is allocated, and information on MBS MAP, to the terminal, and transmitting MBS data through the MBS region to the terminal. Transmitting to.

The information about the MBS area includes location information and transmission parameters of the MBS area. The MBS MAP includes an MBS setting information change indicator indicating whether the MBS setting information is changed from the first MBS setting information to the second MBS setting information.

According to another aspect of the present invention, a method of receiving an MBS is provided. The method includes receiving an MBS MAP including information on an MBS region, which is a resource region to which MBS related information is allocated, and MBS control information including information on the MBS MAP, from a base station, and MBS data through the MBS region. Receiving from the base station.

The information about the MBS area includes location information and transmission parameters of the MBS area. The MBS MAP includes an MBS control information change indicator indicating whether the MBS control information is changed from the first MBS control information to the second MBS control information.

In the mobile radio access system supporting the MBS, the MBS can be efficiently and continuously managed.

1 shows a frame structure for transmitting MBS data.
2 is a block diagram illustrating a method of transmitting MBS configuration information according to an embodiment of the present invention.
3 is a frame structure for transmitting an MBS according to an embodiment of the present invention.
4 is a frame structure for transmitting an MBS according to another example of the present invention.
5 is a block diagram illustrating a method of transmitting MBS configuration information according to another embodiment of the present invention.
6 is a frame structure for transmitting an MBS according to another embodiment of the present invention.
7 is a frame structure for transmitting MBS according to another example of the present invention.
8 is a frame structure for transmitting an MBS according to another embodiment of the present invention.
9 is a flowchart illustrating a method of transmitting MBS information according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification. In addition, even if the detailed description is omitted, descriptions of parts easily understood by those skilled in the art are omitted.

Throughout the specification and claims, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise.

In the present specification, a terminal is a mobile station (MS), a mobile terminal (MT), a subscriber station (SS), a portable subscriber station (PSS), a user equipment (User Equipment). It may also refer to a user equipment (UE), an access terminal (AT), and the like, and may include all or some functions of a terminal, a mobile terminal, a subscriber station, a portable subscriber station, a user device, an access terminal, and the like.

In the present specification, a base station (BS) includes an access point (AP), a radio access station (RAS), a node B (Node B), an advanced node B (evolved NodeB, eNodeB), transmission and reception It may also refer to a base transceiver station (BTS), a mobile multihop relay (MMR) -BS, and the like, and may perform all or part of functions of an access point, a wireless access station, a node B, an eNodeB, a transmission / reception base station, an MMR-BS, and the like. It may also include.

Hereinafter, the MBS control information for providing the MBS will be described.

I. MBS Control Information

(1) MBS region

The MBS area is a physical resource area to which MBS related information (control information or MBS burst) is allocated. The system transmission parameters of the medium access control (MAC) layer and the physical (PHY) layer are the same for each MBS region. One or several MBS data may be transmitted on one frame, and one MBS data may be transmitted on one or several frames. The location information of the MBS area may be transmitted through general system information such as a System Configuration Descriptor (SCD) or configuration information specific to MBS such as an MBS configuration message.

(2) MBS configuration message

The MBS setting message is setting information for setting information on the MBS area, whether or not the MBS MAP is transmitted, the transmission location of the MBS MAP, and transmission parameters of the MAC and PHY associated with the MBS MAP. The terminal may receive the MBS after setting the MBS service using the MBS setting message. As an example, the MBS configuration message may include MBS region related information such as location information of the MBS region, burst size of the MBS MAP, and transmission parameters. The MBS setting message may further include an indicator indicating whether the MBS region transmits only unicast data, only MBS data, or a mixture of unicast / MBS data.

MBS setup messages are sent at any time, for example at least once per MSI, or at least once across multiple MSIs, indicating the MBS MAP until the next MSI or next MBS setup message is sent and then It may also contain information about where the MBS configuration message or MSI will be sent. The MBS configuration message may be the same as the MAC header, MAC message structure, or may be included in the SFH. Of course, if the MBS need not be set for every superframe, the SFH may not include the MBS setting message. In the following description, it is assumed that SFH includes an MBS configuration message in order to unify the description.

There is at least one SFH that defines whether a superframe and MBS MAP are transmitted and a transmission parameter in the MSI. The SFH includes at least one of the presence or absence of transmission of all MBS MAPs in the MSI, transmission parameters, and information on the MBS region. Transmission parameters included in the S-SFH are as follows. i) MBS MAP transmission. ii) The presence of Emergency Service messages. That is, when the MBS traffic for emergency services to be transmitted to the terminal, it can be informed whether or not the presence of emergency services to SFH. iii) MBS MAP indicates only the following MBS MAPs: MSI, transmission location of MBS MAP, transmission parameter of MBS MAP. iv) MBS MAP indicates all MBS MAPs in MSI: MSI, transmission parameters of at least one MBS MAP, and so on.

This is shown in the table below.

Syntax Size (bit) Notes S-SFH IE format () { … MBS MAP IE Indication [bitmap] [TBD] if (Length == 1)
0b0: no information of MBS MAP
0b1: S-SFH IE includes the information of MBS MAP
If (Length> 1)
Indicates whether there is MBS MAP of the corresponding MBS Zone ID.
Bitmap (B) = E-MBS ID% L (length of bitmap)
If it is the bitmap is set, MBS MAP related information for the MBS Zone ID may be included in the current S-SFH IE.
Otherwise, there is no MBS MAP. Therefore, the AMS does not decode the following MBS MAP. Existence of Emergency Service Message One 0: indicate that there is no Emergency Service Message (s) in MBS region.
1: indicates that there is Emergency Service Message in an MBS region If (one of the bitmap of the MBS MAP Indication is set? || Existence of Emergence Service Message == 1) { MBS Interval [TBD] Cycle of MSI, location of the next MBS MAP in the unit of superframe Frame offset 2 Frame location of the first MBS MAP
0b00: current frame
0b01: (current frame + 1) ^th frame
0b10: (current frame + 2 ^{) th} frame
0b11: (current frame + 3) ^th frame Subframe offset 3 Subframe number in the frame of the first MAP MAP
0b000: 1 ^st subframe of the frame
…
0b111: (7 + 1) ^th subframe of the frame Transmission information variable Transmission information (MCS) of MBS MAP, which may include following information:
Modulation
Repetition
-FEC Type
Can be located in the MBS MAP Resource Information [TBD] Indicates the MBS MAP region } … }

Referring to Table 1, S-SFH includes the presence or absence of transmission of MBS MAP and transmission parameters. The E-MBS IE indication is an indicator indicating whether or not the MBS MAP is transmitted. According to the number of MBS zones managed by the base station, the E-MBS IE indicator may be present in a variable manner, and if the MBS zones are separately managed, the presence of MBS MAPs corresponding to the MBS zones may be known. In addition, even when there is a transmission of the MBS message for emergency service can be informed by the presence of the emergency service message (Existence of Emergency Service Message). When the base station informs the terminal of the length of the MSI, the terminal can calculate the transmission time of the next SFH. This allows the terminal to efficiently receive the next SFH. In SFH, the parameters of Table 1 may exist in the P-SFH, but it is assumed here that the parameters exist in the S-SFH, and the presence or absence of transmission of the S-SFH is indicated by the P-SFH.

Table 2 shows the structure of the S-SFH further including MBS region information in the MBS configuration message.

Syntax size (bits) Notes S-SFH IE () { … Region Length [TBD] 0: no MBS region in the superframe> 0: length of the superframe bitmap if (Region Length> 0) { Superframe Bitmap [TBD] Size is the same as region length1: multicast is included in the superframe0: unicast only in the superframe Frame Bitmap 4 * (number of bit set in the superframe bitmap) Maximum length = (number of frame in an superframe) * (length of superframe); Length = (number of frame in an superframe) * (number of set bit in the superframe bitmap) 1: multicast is included in the frame 0: unicast only in the frame Subframe Bitmap (number of subframe in an frame) * (number of bit set in the frame bitmap) Maximum = = number of subframe in an frame) * (Max. Length of frame bitmap) Length = (number of subframe in an frame) * (length of frame bitmap) 1: multicast is included in the subframe 0: unicast only in the frame MBS MAP Indication One indicates whether MBS MAP is addressed or not in this SF if (MBS MAP indication is set) Frame index 2 Frame location of the first MBS MAP message0b00: 1st frame0b01: 2nd frame0b10: 3rd frame0b11: 4th frame Subframe index 3 Subframe location in the frame of the first MBS MAP message 0b000: 1st subframe of the frame…. 0b111: 8th subframe of the frame MCS [4] MCS for the first MBS MAP messageDepends on supported modes, 16modes Resource Information [TBD] Region information of the first MBS MAP message } } … }

(3) MBS MAP

The MBS MAP includes information such as whether the MBS data is transmitted, a resource location to which the MBS data is allocated, and system transmission parameters such as MAC and PHY of the MBS data. MBS MAP may have a structure of a MAC header, a MAC message, or a control channel. At least one MBS MAP exists for each MBS Scheduling Interval (MSI), and includes information on the MBS burst until the next MSI or the next MBS MAP is transmitted, and information on where the next MBS MAP is sent or the next MSI. It may include. The location information of the MBS MAP may be transmitted through general system information such as system configuration detail message (AAI_SCD) or MBS configuration message such as MBS configuration message.

The MBS MAP includes an MBS related control information change indicator. The MBS related control information change indicator indicates that a change will occur in various parameter values (hereinafter referred to as MBS related control information) included in the MBS setting message at the next transmission time. The MBS related control information change indicator may indicate 'change' or 'no change' as 1 bit. When the MBS related control information change indicator indicates 'change', the MBS related control information is changed, and the base station transmits the next MBS related control information according to the changed parameter to the terminal. Accordingly, the terminal decodes the next MBS related control information. On the other hand, if the MBS-related control information change indicator does not instruct the change, the MBS-related control information is not changed, the terminal operates according to the pre-stored MBS-related control information, and does not decode the next MBS-related control information. The terminal may determine when to receive the changed MBS-related control information through the MBS-related control information change indicator, thereby reducing the burden of receiving the same MBS-related control information each time.

Regarding the MBS zone, the MBS MAP may be transmitted separately for each MBS zone managed by the base station, or as an integrated one for some or all of the MBS zone. When defining MBS region information and parameters in the MBS zone, since at least one E-MBS ID exists in the MBS zone, one MBS MAP includes at least one E-MBS ID. Meanwhile, within one E-MBS ID, an MBS service for at least one content may be available, and at least one service flow identifier (FID) for identifying each content may also exist. Therefore, the MBS MAP corresponding to one E-MBS ID includes at least one FID. That is, the E-MBS ID and the FID are paired to distinguish MBS contents, and based on the pair, the terminal acquires and receives corresponding content information.

In relation to the MBS region, the MBS MAP may indicate only one MBS region. In this case, the MBS MAP exists at every transmission of the MBS area. Alternatively, the MBS MAP may indicate all MBS areas until the next MBS MAP is transmitted. Alternatively, the MBS MAP may indicate only the MBS region of the closest position to the MBS MAP. If the MBS MAP indicates only one MBS region, the MBS MAP includes at least one of the location of the MBS region, the transmission parameters of the MAC and PHY, the start position of the next MBS MAP or the next MSI, and the additional transmission parameters.

The MBS MAP may include all the information about the MBS area at once or may be divided by content. For example, the MBS MAP includes information such as a transmission position and a transmission parameter of the first content, and includes information such as a transmission position and a transmission parameter of the second content to be transmitted next.

An example of the information included in the MBS MAP is shown in the following table.

Syntax Size (bit) Description / Notes MBS MAP format () { # of MBS Zone ID [TBD] # of MBS Zone ID included in the MBS MAP IE for (i = 0; i <# of MBS Zone ID; i ++) { MBS Zone Identifier [7] MBS Zone Identifier # of E-MBS ID [3] # of E-MBS ID for (j = 0; j <# of E-MBS ID; j ++) { E-MBS ID 12 Multicast STID # of FID [TBD] # of FID Next MBS MAP frame offset [TBD] Frame location of the next MBS MAP
1: current frame
2: (current frame + 1) ^th frame
…
n: (current frame + n ^{) th} frame Next MBS MAP IE subframe offset 3 Subframe number in the frame of the next MAP MAP
0b000: 1 ^st subframe of the frame
…
0b111: (7 + 1) ^th subframe of the frame Transmission information variable Transmission information (MCS) of next MBS MAP, which may include following information:
Modulation
Repetition
-FEC Type
Can be located in the next MBS MAP for (i = 0; i <# of FID; i ++) { FID 4 Multicast FID Next MBS MAP (about FID) frame offset [TBD] Frame location of the next MBS MAP including FID information
1: current frame
2: (current frame + 1) ^th frame
…
n: (current frame + n ^{) th} frame Next MBS MAP (about FID) subframe offset 3 Subframe number in the frame of the next MAP MAP including FID information
0b000: 1 ^st subframe of the frame
…
0b111: (7 + 1) ^th subframe of the frame FID indication One Indicates whether the MBS traffic is addressed between this MBS MAP and next MBS MAP
0: no MBS traffic is addressed between this MBS MAP and next MBS MAP
1: MBS traffic is addressed between this MBS MAP and next MBS MAP If (FID indication is set) { Transmission information variable Transmission information (MCS) of MBS burst, which may include following information:
Modulation
Repetition
-FEC Type
Can be located in the MBS burst PHY / MAC parameters [TBD] PHY parameters of MBS data channel for each service using joint coding
Can be located in the pre-defined location of the each MBS burst } } } } }

Referring to Table 3, the MBS MAP may transmit information corresponding to all MBS zones at once, and may separately transmit each MBS zone managed by the base station. In case of transmitting information about all MBS zones at once, it transmits including transmission time and location of next MBS MAP. In addition, the MBS MAP includes an indicator indicating whether there is information required for each MBS zone. The transmission may be informed according to the information for each E-MBS ID that may exist for each MBS zone, or may be replaced with an indicator corresponding to the MBS zone. Since one E-MBS ID is mapped, the indicator can be replaced by the indicator corresponding to the MBS zone. However, since multiple channels (FIDs) may exist in the E-MBS ID in the MBS zone, information including transmission information for each FID is transmitted. In this case, the location of the MBS burst may exist in various locations, and various transmission parameters may exist. In case of various transmission parameters, the MBS MAP may include all transmission parameters. Alternatively, the MBS MAP may indicate only a location where the MBS burst is transmitted, and transmit the transmission parameter through a predetermined area or an area indicated by the MBS MAP. The necessary information for each FID may also have an indicator to indicate whether the corresponding information exists in the corresponding FID. If there is a different MBS MAP for each MBS zone, each MBS MAP can exist independently. Alternatively, one MBS MAP may indicate an MBS MAP to be transmitted next in a chain manner.

Table 4 is another example of information included in the MBS MAP.

Syntax size (bits) Notes E-MBS MAP Message format () { # of E-MBS ID [TBD] # of E-MBS Zone ID included in the E-MBS MAP IE for (i = 0; i <# of E-MBS ID; i ++) { E-MBS ID  12 Next E-MBS MAP superframe offset [TBD] 0: current superframe
1: superframe number (current + 1)
…
n: superframe number (current + n) Next E-MBS MAP frame offset 2 for the E-MBS ID
Frame location of the next E-MBS MAP0b00: 1st frame0b01: 2nd frame0b10: 3rd frame0b11: 4th frame Next E-MBS MAP subframe offset 3 for the E-MBS ID Subframe location in the frame of the next E-MBS MAP0b000: 1st subframe of the frame…. 0b111: (7 + 1) th subframe of the frame MCS [4] MCS for MBS MAP messageDepends on supported modes, 16modes Resource Information [TBD] Region Information for the next MBS MAP message # of FID [TBD] # of FIDs for (k = 0; k <#of FID; k ++) { FID 4 Multicast FID for E-MBS ID Frame offset for MBS Region 2 for the FID
Frame location of the next E-MBS Region message
1: current frame
2: (current frame + 1) th frame
…
n: (current frame + n) th frame Subframe offset for MBS Region 3 for the FIDSubframe location in the frame of the next E-MBS Region message 0b000: 1st subframe of the frame…. 0b111: (7 + 1) th subframe of the frame MCS [4] MCS for the E-MBS region of FIDDepends on supported modes, 16modes Resource Information [TBD] Region Information of E-MBS region for the FID } }

Now, a method of instructing the MBS MAP will be described.

2 is a block diagram illustrating a method of transmitting MBS configuration information according to an embodiment of the present invention.

Referring to FIG. 2, the first P-SFH indicates whether the first S-SFH is transmitted and the second P-SFH. Here, the interval between the first P-SFH and the second P-SFH may be equal to MSI. Thus, the location of the second P-SFH can be inferred from the MSI. The first S-SFH indicates the presence, location, and transmission parameters of the first MBS MAP. The first MBS MAP includes MBS zone IDs #n, # n + 1, ... # m (n <m). Each MBS zone ID again indicates the location and transmission parameters of the MBS burst corresponding to each FID. Similarly, the second P-SFH again indicates the second S-SFH and the third P-SFH. However, if the MBS service does not exist in the superframe to which the second S-SFH belongs, the second S-SFH does not indicate the MBS MAP.

As such, the MBS MAP may indicate at least one MBS MAP before the next SFH is transmitted. The first MBS MAP indicated in the MBS related control information may indicate the MBS MAP to be transmitted to the rest of the MSI section. In addition, the transmission parameter of the burst transmitted only to the MBS area and transmitted to the MBS area may be indicated at a pre-defined position (for example, at the beginning of MSI or immediately before MSI) in the MBS area, or as another message. Can be indicated. Such transmission parameters may be separately indicated for each area in which data is transmitted.

3 is a frame structure for transmitting an MBS according to an embodiment of the present invention.

Referring to FIG. 3, the S-SFH indicates one or more MBS MAPs in the MSI. The S-SFH includes an MBS frame bitmap, a bitmap length, and an MBS subframe bitmap. The MBS frame bitmap indicates a frame including the MBS MAP in a bitmap format within the superframe to which the S-SFH belongs. For example, when the MBS MAP exists in the second and fourth frames, the MBS frame bitmap becomes '0101'. If the bitmap is '0', the MBS MAP is not present in the frame. If the bitmap is '1', the MBS MAP is present in the frame. The bitmap length indicates the length of the MBS frame bitmap. The MBS subframe bitmap indicates in which bitframe the MBS MAP is in the frame in a bitmap format. In FIG. 2, there is a first MBS MAP in a fourth subframe among eight subframes of the second frame, and a second MBS MAP in a fourth subframe among eight subframes of the fourth frame. Accordingly, the MBS subframe bitmap becomes '0001 0000 0001 0000'.

MBS MAP includes an MBS region bitmap. The MBS region bitmap indicates which subframe the MBS region is in the MBS MAP frame. In FIG. 2, the fourth subframe of the second frame includes the first MBS MAP. If the MBS region bitmap starts from the fifth subframe after the fourth subframe, the MBS region bitmap is '000010010001000'. In this way, the MBS MAP may indicate the MBS area until the previous MBS MAP.

Although the MBS region bitmap is described as being included in the MBS MAP, this is only an example and the MBS region bitmap may be included in the S-SFH.

4 is a frame structure for transmitting an MBS according to another example of the present invention.

Referring to FIG. 4, the first S-SFH indicates the location of the first MBS MAP to be transmitted after the first S-SFH is transmitted. For example, the first MBS MAP indicates the MBS region to which the MBS burst is allocated before the next second MBS MAP is transmitted. An offset may be used as a method in which the first MBS MAP indicates the MBS region. The offset is included in the S-SFH, and the offset indicates the distance away from the MBS MAP in the current frame to which the S-SFH belongs. The offset includes a frame offset and a subframe offset. The frame offset may be expressed by the number of bits corresponding to the number of frames and the subframe according to the number of subframes. For example, since there are four frames in a superframe, the frame offset can be represented by two bits. In addition, since there are eight subframes in the frame, the subframe offset can be represented by 3 bits.

In FIG. 3, the first MBS MAP is located in the second frame. If the position of the first frame is 0, the frame offset indicating the first MBS MAP is 0b01. The first MBS MAP is located in a fourth subframe in the second frame. If the position of the first subframe is 0, the subframe offset is 0b010. In addition, the MBS region may be indicated by the MBS region bitmap as shown in FIG. 2.

5 is a block diagram illustrating a method of transmitting MBS configuration information according to another embodiment of the present invention.

Referring to FIG. 5, a first P-SFH indicates a second P-SFH and a first S-SFH. The first S-SFH again indicates the first MBS MAP. The first MBS MAP indicates the position of the next second MBS MAP. That is, the MBS MAP can directly indicate the presence, location, and transmission parameters of other MBS MAPs in the MBS zone. Each MBS zone ID of the first MBS MAP indicates presence or absence of transmission of MBS bursts corresponding to each FID and transmission parameters. Meanwhile, the FID may indicate a transmission position of the next FID to be transmitted. In this case, since it is not necessary to receive every MBS MAP, and only MBS MAP corresponding to the FID can be received, power efficiency may be increased. If the user subscribes to the MBS service for the first time or is out of sync with the MBS, the UE may subscribe or re-register through the SFH.

As such, the MBS MAP may indicate only the next MBS MAP and the next MBS MAP may indicate the next MBS MAP. That is, only the first MBS MAP transmitted after SFH transmission may be indicated, and subsequent MBS MAPs may exist in a chain form indicated by the immediately preceding MBS MAP. In this way, the UE receiving the MBS can calculate the location of the next MBS MAP without decoding the SFH, decode the next MBS MAP, and decode the desired MBS burst. According to this, the overhead of the SFH can be reduced by indicating only the start position of the MBS MAP in the SFH. In addition, a terminal that subscribes to the MBS for the first time or has lost synchronization during the reception of the MBS may receive the MBS newly or continuously through the SFH. The location of the MBS MAP and the predefined location of the SFH help to smoothly and quickly perform cross-MBS handover. The fixed location of the MBS configuration message is usually at a specific location in the area where the MSI, which is an MBS burst, is assigned, usually the location where the MSI starts, or in the superframe just before the MSI starts.

In macro diversity, MBS bursts and MBS MAPs transmitted by different base stations are located in the same resource region. This is because the UE can continuously receive the same service even when the UE moves within the MBS zone. In the case of various periodicities, a new MSI exists after one cycle, or a new MBS pattern can be defined through a new MBS MAP, and this definition can be defined in a specific place already set such as SFH.

MBS configuration information may be included in one control channel, MAC header, MAC management message, or may be divided into two control channels such as MBS MAP and SFH.

6 is a frame structure for transmitting an MBS according to another embodiment of the present invention. This is a case of transmitting MBS in a multi-carrier system. This is a case where a primary carrier indicates all MBS MAPs provided by a primary carrier and a secondary carrier.

Referring to FIG. 6, the multi-carrier system supports one primary carrier and four secondary carriers, and the primary carrier can transmit not only MBS information of the primary carrier but also all MBS information of the secondary carrier. P-SFH and S-SFH exist only in the main carrier, and S-SFH includes MBS control information for each carrier. The S-SFH includes a carrier indicator indicating a carrier providing the MBS, the number of frames in the MSI, an MBS frame bitmap, and an MBS subframe bitmap. The number of frames in the MSI is four.

The carrier indicator indicates whether or not each carrier provides MBS in bitmap format. For example, the primary carrier, the first secondary carrier and the third secondary carrier provide MBS, and the second secondary carrier does not provide MBS. Accordingly, the carrier indicator may be represented by 1101.

For a carrier whose carrier indicator is set to '1', it indicates in which bitmap format the MBS MAP is transmitted in which frame. Accordingly, as many MBS frame bitmaps may exist as many carrier indicators are set to '1'. In the case of FIG. 6, since the MBS MAP is transmitted in the second frame and the fourth frame on the main carrier, the MBS frame bitmap is represented by 0101. The MBS frame bitmap is 0101 in the first subcarrier and the MBS frame bitmap is 0111 in the third subcarrier.

The MBS subframe bitmap indicates in particular in which subframe a bitmap format is transmitted within the frame in which the MBS MAP is transmitted. Therefore, in FIG. 6, the MBS subframe bitmap is represented as '00010000 00010000'. The first eight bits indicate successive subframes in the second frame, and the subsequent eight bits indicate successive subframes in the fourth frame. The MBS MAP of the secondary carrier is also indicated by the S-SFH of the primary carrier, and each MBS MAP may be indicated by the previous MBS MAP.

7 is a frame structure for transmitting MBS according to another example of the present invention. This is a case of transmitting MBS in a multi-carrier system. This is a case where the primary carrier indicates one MBS MAP provided from the primary carrier and the secondary carrier.

Referring to FIG. 7, MBS control information included in the S-SFH of the main carrier is the same as described with reference to FIG. 5. However, the S-SFH of the primary carrier indicates one MBS MAP provided from the primary carrier, the first secondary carrier, and the third secondary carrier. Each MBS MAP indicates a subframe for the next MBS on the corresponding carrier. The S-SFH indicates the first MBS MAP of the primary carrier, and the first MBS MAP indicates the remaining subframes in which the MBS is provided. In addition, the S-SFH indicates the second MBS MAP of the first secondary carrier, and the second MBS MAP indicates the remaining subframes in which the MBS is provided. Similarly, the S-SFH also indicates the third MBS MAP of the third secondary carrier, and the remaining MBS MAPs are indicated in a so-called chain manner. That is, the third MBS MAP indicates the next MBS MAP, and the next MBS MAP indicates the next MBS MAP.

8 is a frame structure for transmitting an MBS according to another embodiment of the present invention. This is a case where MBS is transmitted through a dedicated channel in a multi-carrier system.

Referring to FIG. 8, a first subcarrier, which is at least one of subcarriers, is allocated exclusively to the MBS. That is, the first secondary carrier is an MBS dedicated carrier. Accordingly, the first secondary carrier provides the MBS using a predetermined time point and a predetermined resource. The S-SFH or MAC management message includes information about switching timing and duration from the primary carrier to the MBS dedicated carrier. In addition, the information on the switching time and period may be transmitted through the MBS MAP, a separate control channel, a MAC header. In addition, even in an MBS dedicated carrier, a chain scheme in which one MBS MAP indicates a next MBS MAP, or a scheme in which one MBS MAP indicates all other MBS MAPs in an MSI may be used.

(4) Transmission cycle of MBS control information

As described above, the MBS control information not only includes the MBS configuration message and the MBS MAP, but also includes the MBS configuration message and various transmission parameters included in the MBS MAP. Such MBS control information may be transmitted on the S-SFH.

As an example, the transmission period of the MBS control information may be the same period as the S-SFH. In this case, the terminal may update the MBS configuration at the same period as other system parameters, and the application time point of the update is the same as other system parameters of the SFH. For example, if the SFH transmission period and the MBS MAP period are the same or in constant multiples, if all other system parameters or MBS related transmission parameters are updated or only one is updated, one S-SFH change count ) Or simply change or not to notify the terminal of the change. When changed, the changed information can be transmitted.

As another example, the transmission period of the MBS control information may be given separately from the period of the S-SFH. In this case, the UE may perform MBS-related update independently of other system parameters. For example, if the SFH transmission period and the MBS MAP period are present independently, the terminal receiving the MBS service receives the MBS MAP for the MBS service even if there is no change of parameters except for the MBS service. Update.

When joining the MBS or re-joining out of synchronization with the MBS service, the UE must wait until receiving the SFH to acquire the synchronization of the MBS MAP. In order to save the waiting time, the terminal transmits a message requesting the subscription to the MBS to the base station, the base station can be continued service by transmitting the location information of the MBS MAP for the MBS service desired by the terminal to the terminal.

9 is a flowchart illustrating a method of transmitting MBS information according to an embodiment of the present invention.

Referring to FIG. 9, the base station transmits an MBS configuration message to the terminal (S100). The MBS setup message may be S-SFH. The MBS setting message includes an MBS MAP indicator indicating whether the MBS MAP is transmitted and an MBS MAP indicator indicating the MBS MAP. In addition, the MBS setting message may further include information about the MBS area. The information about the MBS area includes location information of a single MBS area and transmission parameters of the MBS area. Alternatively, the information about the MBS area includes location information and transmission parameters of the plurality of MBS areas. The base station transmits the MBS MAP based on the MBS MAP indicator (S110). The MBS MAP includes an MBS related control information change indicator and indicates an MBS burst. If a multi-carrier system is supported, the MBS MAP can be transmitted on the secondary carrier as well as the primary carrier. The base station transmits the MBS burst indicated by the MBS MAP to the terminal (S120).

All of the above functions may be performed by a processor such as a microprocessor, a controller, a microcontroller, an application specific integrated circuit (ASIC), or the like according to software or program code coded to perform the function. The design, development and implementation of the code will be apparent to those skilled in the art based on the description of the present invention.

Although the present invention has been described above with reference to the embodiments, it will be apparent to those skilled in the art that the present invention may be modified and changed in various ways without departing from the spirit and scope of the present invention. I can understand. Therefore, the present invention is not limited to the above-described embodiment, and the present invention will include all embodiments within the scope of the following claims.

Claims (18)

In the transmission method of the multicast broadcast service (hereinafter referred to as MBS) by the base station,
Transmitting MBS configuration information including information on an MBS region, which is a resource region to which MBS related information is allocated, and information on MBS MAP, to a terminal; And
Transmitting MBS data to the terminal through the MBS region;
The information on the MBS area includes location information and transmission parameters of the MBS area, and the MBS MAP indicates MBS setting information indicating whether the MBS setting information is changed from first MBS setting information to second MBS setting information. MBS transmission method comprising a change indicator. The method of claim 1,
The MBS setting information includes location information of the MBS region and modulation and coding of the MBS region. The method of claim 1,
The information on the MBS region further includes location and transmission parameters for a plurality of MBS regions. The method of claim 1,
The information on the MBS MAP includes information indicating whether the MBS MAP is transmitted or not, and information on a transmission location of the MBS MAP, and the terminal uses the information indicating whether or not the MBS MAP is transmitted. MBS transmission method for determining whether to decode. The method of claim 1,
The MBS configuration information is included in a superframe header (SFH), MBS transmission method. The method of claim 1,
The MBS MAP indicates at least one next MBS MAP. In the MBS receiving method,
Receiving from the base station an MBS MAP including information on an MBS region, which is a resource region to which MBS related information is allocated, and MBS control information including information on the MBS MAP; And
Receiving MBS data from the base station through the MBS region;
The information on the MBS region includes location information and transmission parameters of the MBS region, and the MBS MAP indicates MBS control information indicating whether the MBS control information is changed from the first MBS control information to the second MBS control information. MBS receiving method comprising a change indicator. The method of claim 7, wherein
And receiving the second MBS control information from the base station. The method of claim 7, wherein
The base station belongs to at least one MBS zone, the MBS data corresponds to a flow ID (FID) of a specific content, the flow identifier corresponds to the at least one MBS zone, MBS reception Way. The method of claim 7, wherein
The MBS MAP indicates an MBS MAP included in the second MBS control information. The method of claim 7, wherein
The location information of the MBS region indicates a subframe including the MBS region in a superframe, and the information on the MBS MAP indicates a subframe including the MBS MAP in the superframe. . The method of claim 11,
The location information of the MBS region and the information on the MBS MAP has a bitmap format. The method of claim 7, wherein
The MBS is received through a plurality of carriers, the MBS control information is received through a first carrier, and the MBS control information is one of information on the MBS area of the first carrier and information on the MBS area of the second carrier MBS receiving method further comprises at least one. The method of claim 13,
The MBS control information further includes information on MBS MAP of the second carrier. The method of claim 1,
The MBS MAP further includes an identifier (MBS ID) of the MBS service for providing the MBS data and a flow identifier (Flow ID: FID) of the MBS data. The method of claim 15,
And the MBS data is specified by a combination of an identifier of the MBS service and the flow identifier. The method of claim 1,
The MBS configuration information is system information of the base station, and the MBS configuration information further includes an indicator indicating that the MBS region is used for any one of unicast, MBS, and unicast / MBS. Transmission method. The method of claim 1,
And the MBS setting information is transmitted on the superframe immediately before the start position of the MBS scheduling interval (MSI).

Images