KR20100028474A - Transmitting device, receiving device, transmitting method and receiving method for multicast and broadcast service - Google Patents

Abstract

PURPOSE: A transmitting device, a receiving device, a transmitting method and a receiving method for multicast and broadcast service are provided to obtain a reception synchronization of MBS(Multicast And Broadcast Service) map message information using downlink map. CONSTITUTION: An MBS transmission device(200) comprises a calculation unit(210), an MBS zone ID bitmap generating unit(220), a super frame header transmit unit(230), and a controller(240). The MBS zone ID bitmap generating unit generates an MBS zone ID bitmap. The MBS zone ID bitmap comprises the location information of the MBS map message. The transmit unit includes the MBS zone ID bitmap in the SFH(Super Frame Header). The transmit unit transmits the super frame header.

Description

Multicast and Broadcast Service Transmitter, Receiver, Transmit Method and Receive Method {TRANSMITTING DEVICE, RECEIVING DEVICE, TRANSMITTING METHOD AND RECEIVING METHOD FOR MULTICAST AND BROADCAST SERVICE}

The present invention relates to a multicast and broadcast service transmitting apparatus, a receiving apparatus, a transmitting method, and a receiving method.

In general, multicast and broadcast service (MBS) is a point-to-multipoint service that transmits data from one source to multiple receivers. Use common resources Multiple receivers may share a connection ID of a packet in order to use a common resource.

On the other hand, MBS may be divided into a multi base station method and a single base station method. In the multiple base station scheme, a plurality of base stations generate and transmit a physical signal in the same manner, and the plurality of base station groups are called a multicast broadcast service zone (MBS zone).

In general, the UE may receive a downlink MAP to acquire synchronization of the MBS map message, and then receive the next MBS map message using the previously transmitted MBS map message. However, when the UE establishes a new MBS connection and participates in the service, does not receive the MBS map message properly, or moves to another base station, the synchronization of the reception of the map message is broken, and the downlink map received every frame receives the MBS. Acquisition synchronization of map messages should be obtained. Then, the power consumption of the terminal is increased.

The technical problem to be achieved by the present invention is to efficiently acquire the synchronization of the MBS map message by the terminal in the MBS.

A transmitting device according to an embodiment of the present invention is a multicast and broadcast service (MBS) transmitting device of a communication system, and includes an MBS including information for indicating a location of an MBS map message. MBS zone ID bitmap generation unit for generating a zone ID bitmap, and a transmission unit for transmitting the super frame header by including the MBS zone ID bitmap in a super frame header of a super frame.

The MBS zone ID bitmap may indicate whether a downlink map including location information of the MBS map message exists in the super frame.

And a calculation unit for calculating P, the remaining value obtained by dividing an MBS zone ID by a length of an MBS zone ID bitmap. The MBS zone ID bitmap generation unit further includes a MBS zone ID bitmap. The P-th bit of may be set to one.

The calculator may further include a controller configured to control the operation of the calculator to be performed at a predetermined cycle.

The super frame may include a plurality of frames, and the super frame header may be located at the start of the first frame of the plurality of subframes.

The MBS receiving apparatus according to another embodiment of the present invention is an MBS receiving apparatus of a communication system, and determines whether location information of an MBS map message is transmitted through a downlink map of the super frame using a super frame header of a super frame. And a receiving unit for receiving the downlink map when obtaining location information of the MBS map message.

The super frame header includes an MBS zone ID bitmap, and includes a calculator configured to calculate a residual value P obtained by dividing an MBS zone ID by the length of the MBS zone ID bitmap. You can check whether the P th bit is set to one.

When the P-th bit of the MBS zone ID bitmap is set to 1, the receiver may obtain location information of the MBS map message through the downlink map.

The receiving unit receives the MBS map message using location information included in the downlink map when receiving the downlink map, and receives the MBS map message previously received when the downlink map is not received. The following MBS map message can be received using the included location information.

MBS transmission method according to another embodiment of the present invention is a MBS transmission method of the base station in the communication system, generating an MBS zone ID bitmap including information for indicating the location of the MBS map message (MAP message), and And including the MBS zone ID bitmap in the super frame header of the super frame, and transmitting the super frame header.

The generating may include calculating P, the remaining value obtained by dividing the MBS zone ID by the length of the MBS zone ID bitmap, and setting the P-th bit of the MBS zone ID bitmap to 1. .

The MBS zone ID bitmap may indicate whether a downlink map including location information of the MBS map message exists in the super frame.

The MBS reception method according to another embodiment of the present invention is a method of receiving a MBS of a terminal in a communication system, the method comprising: determining whether reception synchronization of an MBS map message is required, and when the reception synchronization is required, a super frame header of a super frame Confirming location information of the MBS map message by using; and receiving the MBS map message through the location information.

The checking may include receiving a downlink map based on the super frame header, and confirming location information of the MBS map message from the downlink map message.

The receiving of the downlink map may include calculating P, the remaining value obtained by dividing an MBS zone ID by the length of an MBS zone ID bit map, wherein the P th bit of the MBS zone ID bitmap included in the super frame header is 1; And checking whether the downlink map is set if the P-th bit is set to 1.

According to the present invention, the terminal can efficiently acquire the synchronization of receiving the MBS map message.

DETAILED DESCRIPTION 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.

Throughout the specification, 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 addition, the terms “… unit”, “… unit”, “module”, etc. described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software. have.

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. It may also include.

Now, a multicast and broadcast service (MBS) transmitting method, a transmitting device, a receiving method, and a receiving device and a receiving device according to an embodiment of the present invention will be described in detail with reference to the drawings.

1 is a diagram illustrating an MBS of a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 1, in a wireless communication system, signals are transmitted and received between a base station and a terminal through consecutive superframes. In FIG. 1, five superframes sf _k , sf _{k + 1} , and sf _{k +} are provided for convenience of description. ₂ , sf _{k + 3} , sf _{k + 4} ) only. Each superframe (sf _k , sf _{k + 1} , sf _{k +2} , sf _{k +3} , sf _{k +4} ) has a plurality of consecutive frames (f _n -f _{n +3} , f _{n +4} -f _{n) +7} , f _{n +8} -f _{n +11} , f _{n + 12} -f _{n + 15} , f _{n +16} -f _{n +19} ). In FIG. 1, each superframe is illustrated as including four frames. Each frame (f _n , f _{n +1} , f _{n +2} , f _{n +3} , f _{n +4} , f _{n +5} , f _{n +6} , f _{n +7} , fn ₊₈ , f _{n + 9} , f _{n + 10} , f _{n + 11} , f _{n + 12} , f _{n + 13} , f _{n + 14} , f _{n + 15} , f _{n + 16} , f _{n + 17} , f _{n + 18} , f _{n + 19} ) May include a plurality of subframes (not shown).

Each of the super frames (sf _k , sf _{k + 1} , sf _{k + 2} , sf _{k + 3} , sf _{k + 4} ) includes a super frame header (SFH), each of which has a super frame header (SFH) It is located at the beginning of a super frame sf _k , sf _{k + 1} , sf _{k + 2} , sf _{k + 3} , sf _{k + 4} and contains system information. In the case where one frame includes a plurality of subframes, the super frame header may be located in the first subframe of the first frame of each super frame.

In order for the base station to provide MBS content to the terminal, the base station transmits an MBS map message to the terminal. The MBS map message may include resource allocation information for MBS content transmission and may also include location information of the MBS map message transmitted in another frame. For example, the MBS map of the _nth , (n + 4) th, (n + 9) th, and (n + 15) th frames (f _n , f _{n + 4} , f _{n +9} , f _{n +15} ) The messages are (n + 3) th, (n + 7) th, (n + 13) th, and (n + 19) th frames (f _{n + 3} , f _{n + 7} , f _{n + 13} , f _{n +) 19} ) resource allocation information of MBS content included in the packet). MBS map messages of the nth, (n + 4) th, and (n + 9) th frames (f _n , f _{n + 4} , f _{n + 9} ) are respectively (n + 4) th, (n + 9) Location information of the MBS map message of the first and (n + 15) th frames f _{n + 4} , f _{n + 9} and f _{n + 15} may be included.

Meanwhile, the base station may transmit a downlink map to inform location information of the MBS map message, such as k-th and (k + 2) -th super frames sf _k and sf _{k + 2} . In this case, the downlink map includes resource allocation information for transmitting downlink data and resource allocation information for transmitting an MBS map message.

After establishing the MBS connection, the terminal receives the downlink map from the base station in frame f _n and checks whether the MBS map message of the MBS zone ID desired to be received is transmitted. Then the terminal frames resource allocation contained in the received the MBS-MAP message in the frame (f _n), using the resource allocation information included in the DL-MAP of (f _n) and the frame MBS MAP message of (f _n) Using the information, MBS content of frame f _{n + 3} is received. Thereafter the terminal frame MBS MAP message of (f _n) receiving the MBS-MAP message in the frame (f _{n + 4)} by using the resource allocation information included in the MBS-MAP message in the frame (f _{n + 4)} MBS content of the frame f _{n + 7} is received using the included resource allocation information. That is, in the frame f _{n + 4} , the terminal may receive the MSB content of the frame f _{n + 4} using only the MSB map message of the frame f _n without receiving the downlink map.

Meanwhile, the super frame header (SFH) of the super frames sf _k , sf _{k + 1} , sf _{k + 2} , sf _{k + 3} , and sf _{k + 4} is the MBS zone ID bitmap. ). A connection identifier shared by terminals belonging to the same MBS zone is referred to as an MBS zone ID. The MBS zone ID bitmap indicates that an MBS map message belonging to the MBS zone ID is transmitted in the corresponding super frame and is displayed in the MBS map message. This indicates whether downlink resource allocation information is transmitted through the downlink map in any frame within the super frame.

That is downstream of the superframe (sf _k) SFH is the superframe (sf _k) of frames (f _n -f _{n +3)} The DL-MAP MBS-MAP message included in a certain frame of the contained in the contained in the Indicates that link allocation information is included. Therefore, at this time, the UE receives the downlink map, receives the MSB map message based on the received MSB map message, and receives the MBS content based on the received MSB map message.

In addition, the superframe header including a superframe (sf _{k + 1)} is the downlink allocation information on the MBS-MAP message during a frame, (f _n -f _{n +4 +7)} included in the superframe (sf _{k + 1)} Indicates that the included downlink map is not included. Accordingly, the terminal receives the MBS contents of the frame f _{n + 7} using the resource allocation information included in the MBS map message of the frame f _{n + 4} without receiving the downlink map.

The super frame header of the super frame sf _{k +2} is the same as the super frame sf _k , and the downlink map included in any one of the frames f _{n +8} -f _{n +11} is downlinked to the MBS map message. Superframe header of the super frame sf _{k +3} and sf _{k +4} is the same as that of the super frame sf _{k +1} and the frame f _{n +12} -f _{n +15, respectively.} , f _{n +6} −f _{n +9} ) indicates that the downlink map including the downlink allocation information for the MBS map message is not included.

By providing the information of the MBS map message through the downlink map as in the super frames sf _k and sf _{k + 2} , when the UE newly participates in the MBS service, when the synchronization of receiving the MBS map message is lost, and the same MBS zone When the UE moves to another base station within the terminal, the terminal may acquire the synchronization of receiving the MBS map message. Therefore, only when the UE needs to acquire MBS map message synchronization, the UE can determine whether to receive the downlink map using the MBS zone ID bitmap of the super frame header. If the terminal does not need to acquire the MBS map message synchronization, the terminal receives the next MBS map message using the previously received MBS map message without using the downlink map. As a result, power of the terminal can be saved.

Now, an MBS transmission apparatus according to an embodiment of the present invention will be described in detail with reference to FIG. 2.

2 is a block diagram schematically illustrating an apparatus for transmitting MBS according to an embodiment of the present invention.

Referring to FIG. 2, the MBS transmitting apparatus 200 is a part mounted in the base station, and includes a calculator 210, an MBS zone ID bitmap generator 220, a super frame header transmitter 230, and a controller ( 240).

The calculator 210 calculates the remaining value P obtained by dividing the MBS zone ID by N, which is the length of the MBS zone ID bitmap.

The MBS zone ID bitmap generator 220 receives the remaining value P calculated by the calculator 210 and generates an MBS zone ID bitmap to set the P th bit to 1. In this case, the remaining bits of the MBS zone ID bitmap may be set to zero.

The super frame header transmitter 230 transmits a super frame header including the MBS zone ID bitmap generated by the MBS zone ID bitmap generator 220 to the terminal.

The controller 240 may control the operation of the calculator 210 to be performed at a constant cycle. For example, the controller 240 may include a timer for notifying a predetermined time period.

Referring now to Figure 3 will be described in detail with respect to the MBS receiving apparatus according to an embodiment of the present invention.

3 is a block diagram schematically illustrating an MBS receiving apparatus according to an embodiment of the present invention.

Referring to FIG. 3, the MBS receiving apparatus 300 is mounted in the terminal and includes a calculating unit 310, an inspecting unit 320, and a receiving unit 330.

The calculator 310 calculates a residual value P obtained by dividing the MBS zone ID by N, which is the length of the MBS zone ID bitmap.

The inspecting unit 320 receives the super frame header and checks whether the P th bit of the MBS zone ID bitmap is set to 1.

The reception unit 330 receives the downlink map when the P th bit of the MBS zone ID bitmap is set to 1 as a result of the inspection of the inspection unit 320, and receives the MBS map message using resource allocation information included in the downlink map. Receive MBS content by using the resource allocation information included in the MBS map message. In addition, if the P-th bit of the MBS zone ID bitmap is not set to 1, the receiving unit 330 does not receive the downlink map and receives the information included in the previously received MBS map message. Receive the next MBS map message by using, and receive the MBS content by using the resource allocation information included in the next MBS map message.

Now, an MBS transmission method according to an embodiment of the present invention will be described in detail with reference to FIG. 4.

4 is a flowchart illustrating an MBS transmission method according to an embodiment of the present invention.

Referring to FIG. 4, first, when the alarm of the timer set in the controller occurs (S410), the base station calculates the remaining value P obtained by dividing the MBS zone ID by N, which is the length of the MBS zone ID bitmap (S420).

Subsequently, the base station generates an MBS zone ID bitmap in which the P-th bit is set to 1, and transmits the MBS zone ID bitmap by including the MBS zone ID bitmap in the super frame header (S430).

Thereafter, the base station transmits the downlink map by including resource allocation information for the MBS message in the downlink map of any frame included in the corresponding super frame (S440).

Subsequently, the base station transmits the MBS map message using the resource allocation information for the MBS message included in the downlink map (S450).

Referring now to Figure 5 will be described in detail with respect to the MBS receiving method according to an embodiment of the present invention.

5 is a flowchart illustrating a method of receiving an MBS according to an embodiment of the present invention.

Referring to FIG. 5, the terminal determines whether reception synchronization of the MBS map message is necessary (S510). If it is necessary to acquire the reception synchronization of the MBS map message, the terminal calculates the remaining value P obtained by dividing the desired MBS zone ID by N, which is the length of the MBS zone ID bitmap (S520).

Thereafter, the terminal receives the super frame header (S530) and checks whether the P th bit of the MBS zone ID bitmap is set to 1 (S530).

If the P-th bit of the MBS zone ID bitmap is not set to 1, the UE operates in a power saving mode during the corresponding super frame (S550). That is, the terminal does not receive the downlink map.

If the P-th bit of the MBS zone ID bitmap is set to 1, the UE receives the downlink map (S560), and receives the MBS map message using resource allocation information included in the received downlink map. MBS reception synchronization is obtained at step S570.

The embodiments of the present invention described above are not only implemented through the apparatus and the method, but may be implemented through a program for realizing a function corresponding to the configuration of the embodiments of the present invention or a recording medium on which the program is recorded.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

1 is a diagram illustrating a multicast and broadcast service (MBS) of a wireless communication system according to an embodiment of the present invention.

2 is a block diagram schematically illustrating an apparatus for transmitting MBS according to an embodiment of the present invention.

3 is a block diagram schematically illustrating an MBS receiving apparatus according to an embodiment of the present invention.

4 is a flowchart illustrating an MBS transmission method according to an embodiment of the present invention.

5 is a flowchart illustrating a method of receiving an MBS according to an embodiment of the present invention.

Claims (15)

An apparatus for transmitting a multicast and broadcast service (MBS) of a communication system, An MBS zone ID bitmap generator for generating an MBS zone ID bitmap including information for indicating a location of an MBS map message; and Transmitter for transmitting the super frame header by including the MBS zone ID bitmap in the super frame header of the super frame Transmission device comprising a. In claim 1, And the MBS zone ID bitmap indicates whether a downlink map including location information of the MBS map message exists in the super frame. In claim 1, The apparatus may further include a calculator configured to calculate P, the remaining value obtained by dividing the MBS zone ID by the length of the MBS zone ID bitmap. The MBS zone ID bitmap generation unit sets the P th bit of the MBS zone ID bitmap to 1 In claim 3, And a control unit for controlling the operation of the calculation unit to be performed at regular intervals. In claim 1, The super frame includes a plurality of frames, The super frame header is located at the beginning of the first frame of the plurality of subframes. An MBS receiving apparatus of a communication system, An inspection unit which checks whether the location information of the MBS map message is transmitted through the downlink map of the super frame using the super frame header of the super frame, and Receiving unit for receiving the downlink map in case of obtaining location information of the MBS map message Receiving device comprising a. In claim 6, The super frame header includes an MBS zone ID bitmap. A calculation unit for calculating a residual value P obtained by dividing an MBS zone ID by the length of the MBS zone ID bitmap; And the checker checks whether the P-th bit of the MBS zone ID bitmap is set to one. In claim 7, The receiving unit When the P th bit of the MBS zone ID bitmap is set to 1, location information of the MBS map message is obtained through the downlink map. Receiving device. In claim 6, The receiving unit When the downlink map is received, the MBS map message is received using the location information included in the downlink map; when the downlink map is not received, the location included in the previously received MBS map message To receive the next MBS map message using the information Receiving device. A method of transmitting MBS of a base station in a communication system, Generating an MBS zone ID bitmap including information for indicating a location of an MBS map message; and Including the MBS zone ID bitmap in a super frame header of a super frame, and Transmitting the super frame header MBS transmission method comprising a. In claim 10, The generating step, Calculating P, the remainder obtained by dividing the MBS zone ID by the length of the MBS zone ID bitmap; and Setting the P th bit of the MBS zone ID bitmap to 1 MBS transmission method comprising a In claim 11, The MBS zone ID bitmap indicates whether a downlink map including location information of the MBS map message exists in the super frame. A method for receiving an MBS of a terminal in a communication system, Determining whether the acquisition synchronization of the MBS map message is necessary; Checking location information of the MBS map message by using a super frame header of a super frame when the reception synchronization is required; and Receiving the MBS map message via the location information MBS receiving method comprising a. In claim 13, The checking step, Receiving a downlink map based on the super frame header, Confirming location information of the MBS map message from the downlink map message; MBS receiving method comprising a. The method of claim 14, Receiving the downlink map, Calculating P, the remaining value obtained by dividing the MBS zone ID by the length of the MBS zone ID bitmap; Checking whether the P th bit of the MBS zone ID bitmap included in the super frame header is set to 1, and Receiving the downlink map when the P th bit is set to 1 Receiving method comprising a.

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