KR101693164B1 - Method of transmitting multicast broadcast service - Google Patents

Abstract

And provides a transmission method of a multicast broadcast service (MBS). The method includes transmitting MBS configuration information including information on an MBS region and a MBS region, which are resource regions to which MBS-related information is allocated, to a terminal, and transmitting MBS data to the terminal through the MBS region, Lt; / RTI > MBS can be efficiently and continuously managed in a mobile radio access system supporting MBS.

Description

{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 a plurality of destinations. to be. The broadcast service refers to a service that is transmitted to all users, and the multicast service refers to a service that transmits to a specific group. The MBS is used in IEEE 802.16e, which is one of the mobile communication standards, and is called MCBCS (MultiCast BroadCast Service) in WiMAX. In IEEE 802.16m, which is an evolved standard in IEEE 802.16e, the term E-MBS (Evolved-MBS) is used. Meanwhile, in the 3GPP (3rd Generation Partnership Project) WCDMA standard, Rel. 5, a standard called MBMS (Multimedia Broadcast Multicast Service) has been established, and after Rel.8 called LTE (Long Term Evolution), it is called E-MBMS (Evolved MBMS). Although the terminology used for each standard is slightly different, all of them are actively being standardized with the aim of providing a broadcasting and communication convergence service.

1 shows a frame structure for transmitting MBS data.

Referring to FIG. 1, a radio frame is configured in units of a superframe, and one superframe is configured in four frames. Each frame is composed of a plurality of subframes. The first subframe of each superframe includes a superframe header (SFH). SFH is a unit in which a plurality of 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 mainly transmitted every super frame. The P-SFH defines whether the S-SFH is transmitted or not and is transmitted in one or more superframe periods.

The MBS has a specific Quality of Service (QoS) and a service flow, which are simultaneously mapped to a plurality of terminals. The terminal receiving the MBS sets the parameters and the service flow to receive the service. A base station providing MBS belongs to at least one MBS zone and is divided into MBS zone IDs. In each MBS zone, the common content is divided into multicast STID (hereinafter referred to as E-MBS ID) and transmitted using a service flow. The E-MBS ID is a common ID allocated to a terminal to receive an MBS service, and each MBS content has the same channel (or a service flow ID, FID). The FID is paired with the corresponding E-MBS ID for each MBS connection.

One terminal can be assigned a plurality of FIDs, and MBS contents belonging to one E-MBS ID are distinguished and transmitted by FID. In the MBS zone, the user must receive the MBS regardless of whether the user's state is a connected state or an idle mode. This means that no additional registration or procedure is required to receive the MBS service. Also, when the MS moves from one MBS zone to another, the MS must continuously receive the MBS regardless of the mode of the MS.

Considering such MBS frame structure and various parameters, a detailed structure of a frame structure, a control channel structure, and a MAP message for efficiently transmitting the MBS is required.

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

According to an aspect of the present invention, there is provided a method of transmitting a Multicast Broadcast Service (MBS) by a base station. The method includes transmitting MBS configuration information including information on an MBS region and a MBS region, which are resource regions to which MBS-related information is allocated, to a terminal, and transmitting MBS data to the terminal through the MBS region, Lt; / RTI >

The information on 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 to be changed from the first MBS setting information to the second MBS setting information.

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

The information on 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 changes from the first MBS control information to the second MBS control information.

MBS can be efficiently and continuously managed in a mobile radio access system supporting MBS.

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 exemplary embodiment of the present invention.
3 is a frame structure for transmitting an MBS according to an exemplary 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 example of the present invention.
6 is a frame structure for transmitting an MBS according to another example 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 MBS according to another example of the present invention.
9 is a flowchart illustrating a method of transmitting MBS information according to an exemplary embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification. And a detailed description thereof will be omitted to omit descriptions of portions that can be readily understood by those skilled in the art.

Throughout the specification and claims, when a section is referred to as "including " an element, it is understood that it does not exclude other elements, but may include other elements, unless specifically stated otherwise.

In this specification, a terminal includes a mobile station (MS), a mobile terminal (MT), a subscriber station (SS), a portable subscriber station (PSS), a user equipment , An access terminal (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 mobile subscriber station, a user equipment,

In this specification, a base station (BS) includes an access point (AP), a radio access station (RAS), a node B, an evolved NodeB (eNodeB) A base station (BTS), a mobile multihop relay (MMR) -BS, or the like, and may perform all or a part of functions of an access point, a radio access station, a Node B, an eNodeB, a base transceiver station, .

MBS control information for providing MBS will be described below.

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 MAC (Medium Access Control) layer and the PHY (physical) layer are the same for each MBS area. 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 MBS specific setting information such as general system information such as a system configuration descriptor (SCD) or an MBS configuration message.

(2) MBS configuration message

The MBS setup message is information for setting the MBS area information, the MBS MAP transmission status, the MBS MAP transmission position, and the MAC and PHY transmission parameters related to the MBS MAP. The UE can receive the MBS after setting up the MBS service using the MBS setup message. For example, the MBS setup message may include MBS area related information such as location information of the MBS area, burst size of the MBS MAP, and transmission parameters. The MBS setup message may further include an indicator indicating whether the MBS area transmits unicast data, only MBS data, or unicast / MBS data.

The MBS setup message is transmitted at least once every arbitrary period, for example, at least once for each MSI, or at least once for several MSIs, indicating the MBS MAP until the next MSI or next MBS setup message is transmitted, It may also contain information about the MBS setup message or where the MSI is to be sent. The MBS setup message may be the same as the MAC header or the MAC message structure, or may be included in the SFH. Of course, if there is no need to set the MBS every superframe, the SFH may not include the MBS setup message. Hereinafter, it is assumed that SFH includes an MBS setup message in order to unify the description.

There is at least one SFH in the MSI that defines the transmission and transmission parameters of the superframe and the MBS MAP. The SFH includes at least one of the transmission status, the transmission parameter, and the MBS area information for all MBS MAPs in the MSI. The transmission parameters included in the S-SFH are as follows. i) Presence of MBS MAP transmission. ii) Emergency Service message transmission. That is, if the MBS traffic for emergency service is to be transmitted to the UE, the SFH can be notified of the presence of an emergency service. iii) When the MBS MAP indicates only the following MBS MAP: MSI, MBS MAP transmission position, MBS MAP transmission parameter. iv) When MBS MAP indicates all MBS MAPs in MSI: MSI, transmission parameters of at least one MBS MAP, and the like.

The table below shows the following.

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 a corresponding MBS Zone ID.
Bitmap (B) = E-MBS ID% L (length of bitmap)
If 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 MAPs. Existence of Emergency Service Message One 0: indicates that there is no Emergency Service Message (s) in the MBS region.
1: Indicates that there is an Emergency Service Message in an MBS region If (one of the bitmaps 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, the S-SFH includes transmission availability and transmission parameters of the MBS MAP. The E-MBS IE indicator is an indicator indicating whether or not the MBS MAP is transmitted. The E-MBS IE indicator can be variable depending on the number of MBS zones managed by the base station, and if the MBS zone is separately managed, the MBS MAP corresponding to the MBS zone can also be determined. Also, even when the MBS message for emergency service is transmitted, it can be notified of existence of an emergency service message (Existence of Emergency Service Message). If the base station informs the MS 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. SFH The parameters in Table 1 may be present in the P-SFH, but here it is assumed to be present in the S-SFH, and the transmission of the S-SFH is indicated in the P-SFH.

Table 2 shows the structure of the S-SFH that additionally includes MBS region information among the MBS setup messages.

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 bits in the superframe bitmap) (Length of superframe); Length = (number of frames in superframe) * (number of sets in 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 bits in the frame bitmap) Length = (number of subframe in an frame) * (length of frame bitmap) * (length of frame bitmap) * (length of frame bitmap) 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 to transmit MBS data, a resource location to which MBS data is allocated, and system transmission parameters such as MAC and PHY of MBS data. The MBS MAP may have a structure of a MAC header, a MAC message, or a control channel. The MBS MAP includes at least one MBS Scheduling Interval (MBS Scheduling Interval), information about the MBS burst until the next MSI or the next MBS MAP is transmitted, information about the next MBS MAP to be transmitted, information about the next MSI . ≪ / RTI > The location information of the MBS MAP may be transmitted through MBS-specific configuration information such as general system information such as a system configuration detail message (AAI_SCD) or an 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, MBS-related control information) included in the MBS setup message at the next transmission time. The MBS-related control information change indicator may indicate 'change' or 'no change' as one 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 UE decodes the next MBS-related control information. On the other hand, when the MBS-related control information change indicator does not instruct the change, the MBS-related control information is not changed and the terminal operates according to the previously stored MBS-related control information and does not decode the next MBS-related control information. The UE can determine the point of time to receive the MBS-related control information through the MBS-related control information change indicator, thereby reducing the burden of receiving the same MBS-related control information every time.

With respect to the MBS zone, the MBS MAP may be sent separately for each MBS zone managed by the base station, or as an aggregate for some or all of the MBS zones. When MBS area information and parameters in the MBS zone are defined, at least one E-MBS ID exists in the MBS zone, and one MBS MAP includes at least one E-MBS ID. Meanwhile, at least one service flow identifier (hereinafter, referred to as FID) may be present in one E-MBS ID to enable MBS service for at least one content and to distinguish each content. 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 the MBS contents, and the terminal acquires and receives the corresponding content information based on the pair.

With respect to the MBS area, the MBS MAP can indicate only one MBS area. In this case, the MBS MAP exists every time the MBS area is transmitted. Alternatively, the MBS MAP may indicate all MBS areas before the next MBS MAP is transmitted. Alternatively, the MBS MAP may indicate only the MBS area nearest 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 additional transmission parameters.

The MBS MAP can include all the information about the MBS area at one time or can be divided for each content. For example, the MBS MAP includes information such as transmission position and transmission parameter of the first content, and information such as transmission position and transmission parameter of the second content to be transmitted next.

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

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 each MBS burst } } } } }

Referring to Table 3, the MBS MAP can transmit information corresponding to all the MBS zones at a time, and can be separately transmitted to the MBS zones managed by the base station. When information on all the MBS zones is transmitted at one time, it is transmitted including the transmission time and transmission position of the next MBS MAP. In addition, the MBS MAP includes an indicator indicating whether or not there is necessary information for each MBS zone. It may be informed of the transmission according to the E-MBS ID information available for each MBS zone, or it may be replaced with an indicator corresponding to the MBS zone. Since one E-MBS ID is mapped, the indicator can be replaced by an indicator corresponding to the MBS zone. However, since there are a plurality of channels (FID) in the E-MBS ID in the MBS zone, information necessary for transmission is transmitted for each FID. At this time, the MBS burst position can exist in various positions, and various transmission parameters can exist. If the transmission parameters are different, the MBS MAP may include all transmission parameters. Alternatively, the MBS MAP may indicate only the location where the MBS burst is transmitted, and may transmit the transmission parameter through a predetermined area or an area indicated by the MBS MAP. The necessary information for each FID can also be indicated by indicating the corresponding information in the corresponding FID. If there is another MBS MAP for each MBS zone, each MBS MAP can exist independently. Alternatively, one MBS MAP in a chain manner may indicate an MBS MAP to be transmitted next.

Table 4 is another example of the 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 IDSubframe 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 message0b000: 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 exemplary embodiment of the present invention.

Referring to FIG. 2, the first P-SFH indicates the transmission of the first S-SFH and the second P-SFH. Here, the interval between the first P-SFH and the second P-SFH may be equal to the MSI. Thus, the position of the second P-SFH is inferable from the MSI. The first S-SFH indicates the transmission status, 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.

Thus, the MBS MAP can indicate at least one MBS MAP before the next SFH is transmitted. The first MBS MAP indicated by the MBS-related control information may indicate an MBS MAP to be transmitted to the rest of the MSI interval. Also, the transmission parameters of the bursts pointing to only the MBS area and transmitted to the MBS area may be indicated at a pre-defined location of the MBS area (e.g., at the beginning of the MSI or at the beginning of the MSI) Can be instructed. These 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 exemplary 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 the frame including the MBS MAP in the bitmap format in the superframe to which the S-SFH belongs. For example, if there is an MBS MAP in the second and fourth frames, the MBS frame bitmap becomes '0101'. If the bitmap is '0', the MBS MAP does not exist in the corresponding frame. If the bitmap is '1', the MBS MAP exists in the corresponding frame. The bitmap length indicates the length of the MBS frame bitmap. The MBS sub-frame bitmap indicates in which sub-frame the MBS MAP is located in the frame in a bitmap format. In FIG. 2, a first MBS MAP is present in the fourth subframe among the eight subframes of the second frame, and a second MBS MAP is located in the fourth subframe among the eight subframes of the fourth frame. Accordingly, the MBS subframe bitmap becomes '0001 0000 0001 0000'.

The MBS MAP includes an MBS region bitmap. The MBS region bitmap indicates in which sub-frame the MBS region is within the MBS MAP frame. In FIG. 2, the fourth subframe of the second frame includes a first MBS MAP. Assuming that the MBS region bitmap starts from the fifth sub-frame next to the fourth sub-frame, the MBS region bitmap is '000010010001000'. As a result, the MBS MAP can indicate the MBS area before the next MBS MAP.

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

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 an MBS area to which an MBS burst is allocated until the next second MBS MAP is transmitted. As a method by which the first MBS MAP indicates the MBS area, an offset can be used. The offset is included in the S-SFH, and the offset indicates the distance of the MBS MAP in the current frame to which the S-SFH belongs. Offset has frame offset and subframe offset. The frame offset can be expressed by the number of frames according to the number of frames, and the subframe can be expressed by the number of bits corresponding to the number of subframes. For example, since there are four frames in a superframe, the frame offset can be represented by two bits. Also, since there are eight subframes in a frame, the subframe offset can be represented by three bits.

In Figure 3, the first MBS MAP is located in the second frame. Assuming that 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 the fourth subframe in the second frame. Assuming that the position of the first subframe is 0, the subframe offset is 0b010. In addition, the MBS area may be indicated by an MBS area bitmap as in FIG.

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

Referring to FIG. 5, a first P-SFH indicates a second P-SFH and a first S-SFH. Then, the first S-SFH again indicates the first MBS MAP. The first MBS MAP indicates the location of the next second MBS MAP. That is, the MBS MAP can directly indicate the transmission, location, and transmission parameters of another MBS MAP in the MBS zone. Each MBS Zone ID of the first MBS MAP indicates the transmission availability and transmission parameters of the MBS burst corresponding to each FID. On the other hand, the FID may indicate the transmission position of the next FID to be transmitted. In this case, since it is not necessary to receive every MBS MAP and only the MBS MAP corresponding to the FID can be received, the power efficiency can be increased. If a subscriber first enters the MBS service or is out of sync with the MBS, the subscriber can subscribe or re-enter through the SFH.

Thus, the MBS MAP may indicate only the next MBS MAP and the next MBS MAP may indicate the next MBS MAP. That is, it indicates only the MBS MAP to be transmitted first after the SFH transmission, and the subsequent MBS MAP can exist in a chain form indicated by the immediately preceding MBS MAP. In this way, the MS receiving the MBS service can calculate the position 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 has joined the MBS for the first time or whose synchronization has been lost while receiving the MBS can newly or continuously receive the MBS through the SFH. The location of the MBS MAP and the predefined location of the SFH help the MBS inter-site handover to be desirable and quick. The fixed location of the MBS setup message is typically at a specific location in the area to which the MSI is allocated, usually the MBS burst, or it may be in the superframe just before the MSI starts.

In macro diversity, both MBS bursts and MBS MAPs transmitted by different base stations are located in the same resource area. This is because the same service can be continuously received even when the mobile terminal moves within the MBS zone. In case of having various periodicity, it is possible to define a new MBS pattern through a new MBS MAP or a new MSI after one cycle, and this definition can also be defined in a predetermined place such as SFH.

The MBS configuration information may be included in one control channel, a MAC header, a 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 example of the present invention. This is the case when MBS is transmitted in a multi-carrier system. This is the case where the primary carrier indicates all MBS MAPs provided on the primary and secondary carriers.

Referring to FIG. 6, the multi-carrier system supports one main carrier and four auxiliary carriers, and the main carrier can transmit not only the MBS information of the main carrier but also all the MBS information of the auxiliary carrier. P-SFH and S-SFH exist only on 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 in a bitmap format whether each carrier provides MBS. For example, the main carrier, the first auxiliary carrier, and the third auxiliary carrier provide the MBS, and the second auxiliary carrier does not provide the MBS. Therefore, the carrier indicator may be represented by 1101.

For a carrier whose carrier indicator is set to '1', it indicates in which frame the MBS MAP is transmitted in bitmap format. Accordingly, the MBS frame bitmap may exist as many as the number of the carrier indicators set to '1'. 6, since the MBS MAP is transmitted in the second frame and the fourth frame on the main carrier, the MBS frame bit map is represented by 0101. [ The MBS frame bitmap in the first auxiliary carrier wave is 0101 and the MBS frame bitmap in the third auxiliary carrier wave is 0111. [

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

7 is a frame structure for transmitting MBS according to another example of the present invention. This is the case when MBS is transmitted in a multi-carrier system. This is the case where the main carrier indicates one MBS MAP provided on the main carrier and the auxiliary carrier.

Referring to FIG. 7, the MBS control information included in the S-SFH of the main carrier is the same as that described in FIG. However, the S-SFH of the main carrier indicates one MBS MAP provided from the main carrier, the first auxiliary carrier, and the third auxiliary carrier, respectively. Each MBS MAP indicates a next MBS subframe on the corresponding carrier. The S-SFH indicates the first MBS MAP of the main carrier, and the first MBS MAP indicates the remaining sub-frames to which the MBS is provided. Also, the S-SFH indicates the second MBS MAP of the first sub-carrier, and the second MBS MAP indicates the remaining sub-frames to which the MBS is provided. Similarly, the S-SFH indicates the third MBS MAP of the third auxiliary carrier, and the remaining MBS MAPs are indicated in the 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 MBS according to another example of the present invention. This is the case where MBS is transmitted through a dedicated channel in a multi-carrier system.

Referring to FIG. 8, a first auxiliary carrier wave, which is at least one of the auxiliary carrier waves, is dedicated to the MBS. That is, the first auxiliary carrier wave is an MBS dedicated carrier wave. Thus, the first auxiliary carrier provides the MBS using the determined time and the predetermined resources. The S-SFH or MAC management message includes information about the switching timing and duration from the main carrier to the MBS dedicated carrier. In addition, information on switching time and duration may be transmitted through an MBS MAP, a separate control channel, a MAC header, and the like. Also, in a MBS dedicated carrier wave, a chain mode in which one MBS MAP indicates the next MBS MAP, or a scheme in which one MBS MAP indicates all other MBS MAPs in the MSI can be used.

(4) Transfer cycle of MBS control information

As described above, the MBS control information includes not only the MBS setup message and the MBS MAP, but also various transmission parameters included in the MBS setup message and 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 UE can update the MBS setting with the same period as the other system parameters, and the application timing of the update is the same as the other system parameters of the SFH. For example, if the SFH transmission period and the MBS MAP period are the same or have a constant multiple relationship, if one of the other system parameters or MBS related transmission parameters is updated or only one is updated, one S-SFH change count ) Or simply notify the terminal of the change schedule by using the presence or absence of the change. It is possible to transmit the changed information including the changed information.

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 terminal can perform MBS-related update independently of other system parameters. For example, if the SFH transmission period and the MBS MAP period are independent of each other, the terminal receiving the MBS service receives the MBS MAP for the MBS service even if the parameters other than the MBS are not changed, Update.

If the UE needs to join the MBS or re-join with the MBS service out-of-synchronization, the UE must wait until it receives the SFH to acquire synchronization of the MBS MAP. In order to save the waiting time, the UE transmits a message requesting subscription to the MBS to the BS, and the BS can enable continuous service by transmitting the location information of the MBS MAP related to the desired MBS service to the UE.

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

Referring to FIG. 9, the BS transmits an MBS configuration message to the MS (S100). The MBS setup message may be S-SFH. The MBS setup message includes an MBS transmission indicator indicating whether the MBS MAP is transmitted and an MBS MAP indicator indicating the MBS MAP. In addition, the MBS setup message may further include information on the MBS area. The information on the MBS area includes position information of a single MBS area and transmission parameters of the MBS area. Alternatively, the information on the MBS area includes position information and transmission parameters of a 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. When a multi-carrier system is supported, the MBS MAP may be transmitted on the primary carrier as well as the auxiliary carrier. The base station transmits the MBS burst indicated by the MBS MAP to the terminal (S120).

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

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention. You will understand. Therefore, it is intended that the present invention covers all embodiments falling within the scope of the following claims, rather than being limited to the above-described embodiments.

Claims (18)

A method for transmitting a Multicast Broadcast Service (MBS) by a base station,
Transmitting information on an MBS region, which is a resource region to which MBS-related information is allocated, to a terminal;
Transmitting MBS configuration information including information on an MBS MAP to the MS; And
And transmitting the MBS data to the MS through the MBS area,
The MBS MAP includes a control information change indicator indicating whether control information included in MBS information and a secondary superframe header (S-SFH) is to be changed,
The information on the MBS MAP includes information indicating whether the MBS MAP is transmitted or not, information on a transmission position of the MBS MAP, and the terminal uses information indicating whether the MBS MAP is transmitted, To determine whether to decode the MBS. The method according to claim 1,
Wherein the MBS setup information includes position information of the MBS region or modulation and coding of the MBS region. The method according to claim 1,
Wherein the information about the MBS area further includes a location and a transmission parameter for a plurality of MBS areas. delete A method for transmitting a Multicast Broadcast Service (MBS) by a base station,
Transmitting information on an MBS region, which is a resource region to which MBS-related information is allocated, to a terminal;
Transmitting MBS configuration information including information on an MBS MAP to the MS; And
And transmitting the MBS data to the MS through the MBS area,
The MBS MAP includes a control information change indicator indicating whether control information included in MBS information and a secondary superframe header (S-SFH) is to be changed,
Wherein the MBS setup information is included in a superframe header (SFH). The method according to claim 1,
Wherein the MBS MAP indicates at least one next MBS MAP. In the MBS receiving method,
Receiving information on an MBS region as a resource region to which MBS-related information is allocated;
Receiving MBS configuration information including information on an MBS MAP from a base station; And
And receiving MBS data from the base station through the MBS region,
The MBS MAP includes a control information change indicator indicating whether control information included in MBS information and a secondary superframe header (S-SFH) is to be changed,
Wherein the MBS information further includes an MBS ID of an MBS service providing the MBS data and a Flow ID (FID) of the MBS data. 8. The method of claim 7,
And receiving second MBS setup information from the base station. In the MBS receiving method,
Receiving information on an MBS region as a resource region to which MBS-related information is allocated;
Receiving MBS configuration information including information on an MBS MAP from a base station; And
And receiving MBS data from the base station through the MBS region,
The MBS MAP includes a control information change indicator indicating whether control information included in MBS information and a secondary superframe header (S-SFH) is to be changed,
Wherein the base station belongs to at least one MBS zone, the MBS data corresponds to a flow identifier (FID) of a specific content, and the flow identifier corresponds to at least one MBS zone Way. 8. The method of claim 7,
Wherein the MBS MAP indicates an MBS MAP included in the second MBS setup information. In the MBS receiving method,
Receiving information on an MBS region as a resource region to which MBS-related information is allocated;
Receiving MBS configuration information including information on an MBS MAP from a base station; And
And receiving MBS data from the base station through the MBS region,
The MBS MAP includes a control information change indicator indicating whether control information included in MBS information and a secondary superframe header (S-SFH) is to be changed,
Wherein the location information of the MBS area indicates a subframe including the MBS area in a superframe and information on the MBS MAP indicates a subframe including the MBS MAP in the superframe. . 12. The method of claim 11,
Wherein the MBS area location information and the MBS MAP information have a bitmap format. 8. The method of claim 7,
The MBS is received via a plurality of carriers, the MBS setup information is received via a first carrier, the MBS setup information includes information on an MBS area of the first carrier and information on an MBS area of a second carrier And further comprising at least one MBS receiving method. 14. The method of claim 13,
Wherein the MBS setup information further includes information on an MBS MAP of the second carrier. A method for transmitting a Multicast Broadcast Service (MBS) by a base station,
Transmitting information on an MBS region, which is a resource region to which MBS-related information is allocated, to a terminal;
Transmitting MBS configuration information including information on an MBS MAP to the MS; And
And transmitting the MBS data to the MS through the MBS area,
The MBS MAP includes a control information change indicator indicating whether control information included in MBS information and a secondary superframe header (S-SFH) is to be changed,
Wherein the MBS information further includes an identifier (MBS ID) of an MBS service providing the MBS data and a flow ID (FID) of the MBS data. 16. The method of claim 15,
Wherein the MBS data is specified by a combination of an identifier of the MBS service and the flow identifier. A method for transmitting a Multicast Broadcast Service (MBS) by a base station,
Transmitting information on an MBS region, which is a resource region to which MBS-related information is allocated, to a terminal;
Transmitting MBS configuration information including information on an MBS MAP to the MS; And
And transmitting the MBS data to the MS through the MBS area,
The MBS MAP includes a control information change indicator indicating whether control information included in MBS information and a secondary superframe header (S-SFH) is to be changed,
Wherein the MBS setup information is system information of the BS, and the MBS setup information further includes an indicator indicating that the MBS zone is used for unicast, MBS, and unicast / MBS. Transmission method. A method for transmitting a Multicast Broadcast Service (MBS) by a base station,
Transmitting information on an MBS region, which is a resource region to which MBS-related information is allocated, to a terminal;
Transmitting MBS configuration information including information on an MBS MAP to the MS; And
And transmitting the MBS data to the MS through the MBS area,
The MBS MAP includes a control information change indicator indicating whether control information included in MBS information and a secondary superframe header (S-SFH) is to be changed,
Wherein the MBS setup information is transmitted on a super frame immediately before a start position of an MBS scheduling interval (MSI).

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