KR101372908B1 - Apparatus and method for multicast/broadcast service in a broadband wireless access system - Google Patents

Abstract

The present invention relates to an apparatus and method for multicast / broadcast service in a broadband wireless access system. The present invention relates to a base station for multicast and broadcast services, and to receive multicast / broadcast service (MBS) data. A MBS data processor for dividing the protocol data unit (PDU) by a unit; a logical identifier indicator for identifying a multicast connection ID (MCID) and a content identifier of the MBS data; and a PDU unit for the MBS data processor A PDU generator includes a PDU generator that generates the MBS data as a PDU that can identify the content identifier in the MAC layer using the MCID identified by the logical identifier indicator and the content identifier. It is effective to distinguish by.

Multicast / Broadcast Service (MBS), Multicast Connection ID (MCID), MAC Layer, Content Identifier, Logical Channel ID, MBS contents ID

Description

Apparatus and method for multicast / broadcasting service in broadband wireless access system {APPARATUS AND METHOD FOR MULTICAST / BROADCAST SERVICE IN A BROADBAND WIRELESS ACCESS SYSTEM}

The present invention relates to a multicast / broadcast service apparatus and method in a broadband wireless access (BWA) system, and more particularly, to a mobile station (MS) in a broadband wireless access system. The present invention relates to an apparatus and method for receiving MBS by selectively decoding only MBS data serviced by the mobile terminal by dividing a content identifier in a MAC layer when receiving MBS data when receiving a multicast / broadcast service (MBS).

In general, communication systems have been developed mainly for voice services, and are gradually developing to communication systems capable of not only voice but also data services and various multimedia services. However, since the voice-oriented communication system has a relatively small data transmission bandwidth and a high usage fee, the voice-oriented communication system cannot meet the rapidly increasing demand for users. In addition, due to the development of the communication industry and increasing user demand for Internet services, there is an increasing need for a communication system capable of efficiently providing Internet services. Accordingly, a broadband wireless access communication system has been proposed to efficiently provide Internet services with broadband enough to meet the increasing demand of users.

In the 802.16 communication system, a multicast / broadcast service (MBS) may be provided. MBS is a method for simultaneously transmitting traffic having the characteristics of multicast and broadcast to multiple mobile terminals, and such MBS is referred to as a single base station connection (hereinafter, referred to as 'single-BS access') according to the service access method of the mobile terminal. And multi-base station access (hereinafter referred to as multi-BS access). The single-BS access method refers to a method in which the mobile terminal receives a predetermined MBS from one base station to which the mobile terminal is registered, for example, a serving BS. The multi-BS access method refers to a method in which two or more base stations, for example, the mobile terminal, receive MBS simultaneously from the serving base station and the neighbor BS in a cell overlapping area of the serving base station and the neighbor base station.

When the mobile terminal registers with the base station supporting the MBS, it checks whether the multi-BS MBS is supported. Base stations synchronized with each other to support the MBS may configure an MBS zone. A base station in one MBS station should be synchronized for transmission of the corresponding MBS data burst, and this MBS area is divided into MBS zone identifiers (MBS zone IDs). One base station may belong to several MBS areas and transmits the corresponding MBS zone ID list through a downlink channel descriptor (DDC) message. The mobile terminal can check which MBS area the base station belongs to through the DCD message.

When the base station completes the registration process of the mobile terminal to start the service to provide the MBS, the base station goes through a dynamic service allocation process. The dynamic service allocation process is a process of transmitting a multicast connection ID (hereinafter referred to as 'MCID') for MBS data that a mobile station wants to receive. The base station transmits an MBS zone ID and MCID to a dynamic service addition (DSA) message. And transmit to the mobile terminal. The mobile terminal can distinguish the MBS data burst transmitted through the MBS area through the MBS zone ID and the MCID information.

1 is a diagram illustrating a frame structure for a multicast and broadcast service according to the prior art. Referring to FIG. 1, the base station may use a portion of a downlink frame 100 as an MBS sub-frame. The MBS_MAP_IE transmitted through the DL-MAP indicates the location of the MBS sub-frame. The MBS sub-frame includes the MBS-MAP 102 message. The MBS-MAP 102 message includes information of MBS data bursts 104 and 106 delivered through the MBS sub-frame, and the MBS data burst can be distinguished through the MBS zone ID and the MCID. The mobile terminal can distinguish and decode the MBS data burst corresponding to itself through the MBS zone ID and the MCID included in the MBS-MAP 102 message.

That is, the mobile terminal can determine the location of the MBS data burst through the MBS-MAP message. Such information can be delivered in three forms, MBS_DATA_IE, Extended_MBS_DATA_IE, and MBS_DATA_Time_Diversity_IE, as defined in the 802.16e standard. MBS_DATA_IE is used only when MCID is used, Extended_MBS_DATA_IE is used when Logical channel ID is used, and MBS_DATA_Time_Diversity_IE is used when HARQ is used.

As such, the mobile terminal distinguishes MBS data bursts assigned to the mobile station through the MCID. In some cases, a single MCID may include a plurality of MBS Content IDs. That is, a plurality of contents may be serviced by one MCID.

The MBS Contents ID is 2 bytes in length, and is used to divide each MBS contents sharing one MBS connection into logical multiple connections. Meanwhile, a logical channel ID of 1 byte length is used in Extended_MBS_DATA_IE and is mapped to each MBS contents ID. For example, Logical channel ID 0 refers to the first MBS contents ID delivered to dynamic service allocation for one MCID.

One MBS data burst may include protocol data units (PDUs) having different MCIDs and logical channel IDs. The mobile terminal decodes the MBS data burst if it contains the MCID managed by the mobile station. In this case, each PDU includes a MAC header, so that the mobile terminal can receive the corresponding PDU through its MCID information in the MAC header. It can be checked whether it is MBS service data. That is, among the plurality of PDUs included in one MBS data burst, only the data of the PUD having the MCID managed by the mobile terminal is raised to the upper level through the MAC header of each PDU and the rest are discarded.

Each MBS contents sharing one MBS connection can be logically classified using MBS contents ID. That is, different MBS service contents may be connected through one MCID, but may be distinguished using different Contents IDs.

When different MBS service contents are allocated to different MCIDs, the mobile terminal can distinguish data to be transmitted to the upper level through the MCID through the MAC header of the received PDU. However, if each service content is classified by Contents ID, the MAC layer cannot classify these PDUs by Contents ID, so all data is transferred to the upper level. For example, when different MCIDs 1, 2, and 3 are allocated to each of three service channels A, B, and C, which are currently broadcasted through a base station, when the UE wants to receive channel A, only the MCID of the PDU is 1. Can be filtered and passed to the parent. However, if the same MCID 1 is assigned to channels A, B, and C, which are different service contents, and each of channels A, B, and C is divided into Contents IDs 100, 101, and 102, the mobile terminal attempts to receive channel A. All data for B, C are transferred from MAC layer to upper layer.

When different MBS service contents are to be classified by Contents ID, channel filtering must be performed at a higher layer, so all data is transferred from the MAC layer to the upper layer. This is not only inferior to performance degradation due to unnecessary data decoding and transmission, but also does not meet the intention of classifying data using MBS Contents ID in the MAC layer of the current standard.

Therefore, even when the contents of the multicast / broadcast service are classified through the MBS contents ID, the apparatus and method are required so that the PDUs can be classified by the contents identifier in the MAC layer.

SUMMARY OF THE INVENTION An object of the present invention is to provide a multicast / broadcast service apparatus and method in a broadband wireless access system.

Another object of the present invention is to provide an apparatus and method for dividing a protocol data unit by contents ID in a MAC layer when contents of a multicast / broadcast service are classified through MBS contents ID in a broadband wireless access system. have.

Another object of the present invention is to selectively decode only MBS data serviced by the mobile terminal by classifying a content identifier in the MAC layer when receiving the MBS data when the mobile terminal receives multicast and broadcast services in a broadband wireless access system. To provide an apparatus and method for receiving MBS.

It is still another object of the present invention to provide a configuration of a MAC header for dividing a protocol data unit for a multicast / broadcast service by contents identifier (Contents ID).

It is still another object of the present invention to provide a configuration of a protocol data unit having a subheader for subdividing the protocol data unit for a multicast / broadcast service by contents ID.

According to a first aspect of the present invention for achieving the above objects, a base station performing a multicast and broadcast service in a broadband wireless access system, when receiving the multicast and broadcast service (MBS: Multicast / Broadcast Service) data MBS data processor for dividing the protocol data unit (PDU) unit, logical identifier indicator for identifying the multicast connection ID (MCID) and the content identifier of the MBS data, and divided by PDU unit in the MBS data processor And a PDU generator configured to generate the MBS data into a PDU that can identify the content identifier in the MAC layer using the MCID and the content identifier identified by the logical identifier indicator.

According to a second aspect of the present invention for achieving the above objects, a mobile terminal receiving a multicast and broadcast service in a broadband wireless access system detects a protocol data unit (PDU) in a downlink burst When the PUD detector and the MBS PDU having the Multicast / Broadcast Service (MBS) data are detected by the PDD detector, the multicast connection ID (MCID) and the content identifier of the MBS PDU are checked in the MAC layer. And a logical identifier processor for identifying whether the MBS PDU is an MBS serviced by the mobile terminal through the MCID and the content identifier.

According to a third aspect of the present invention for achieving the above objects, a method for performing a multicast and broadcast service at a base station of a broadband wireless access system includes: Multicast / Broadcast Service (MBS) data. Receiving the MBS; dividing the received MBS data into protocol data units (PDUs); checking a multicast connection ID (MCID) and a content identifier of the MBS data; It includes the MBS data divided into, characterized in that it comprises the step of generating a PDU that can identify the content identifier in the MAC layer.

According to a fourth aspect of the present invention for achieving the above objects, a method for receiving a multicast and broadcast service in a mobile terminal of a broadband wireless access system includes: a protocol data unit (PDU) when receiving a downlink burst ), And if the detected PDU is an MBS PDU having Multicast / Broadcast Service (MBS) data, the MAC layer uses the MCID (Multicast connection ID) and the content identifier of the MBS PDU. And confirming whether the MBS PDU is an MBS serviced by the mobile terminal through the MCID and the content identifier.

As described above, the present invention relates to an apparatus and method for dividing a protocol data unit by contents ID in a MAC layer when contents of a multicast / broadcast service are classified through MBS contents ID in a broadband wireless access system. This reduces the performance degradation due to unnecessary data decoding.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Further, if it is determined that the gist of the present invention may be unnecessarily blurred, detailed description thereof will be omitted.

The present invention relates to an apparatus and method for classifying a protocol data unit by contents ID in a MAC layer even when contents of a multicast / broadcast service are classified through MBS contents ID in a broadband wireless access system.

Prior to the detailed description of the present invention, when a plurality of contents are serviced by one multicast connection ID, an identifier for identifying the contents may be expressed as an MBS contents ID or a logical channel ID according to a form defined in the standard. In the present invention, the MBS contents ID and the Logical Channel ID are collectively called a content identifier.

Then, prior to describing the apparatus of the present invention, a configuration of a protocol data unit (PDU) for distinguishing a content identifier (Contents ID) in the MAC layer will be described with reference to the accompanying drawings.

2 is a diagram illustrating a structure of a MAC header according to an embodiment of the present invention and a structure of a MAC header according to a conventional standard. 2 (a) is a configuration of the MAC header of the conventional standard for the multicast / broadcast service, Figure 2 (b) is a configuration of the MAC header of the present invention for the multicast / broadcast service. Looking at the difference between the conventional MAC header and the MAC header of the present invention, MBS indicating whether a reserved (Rvd: Reserved) 202 bit of the conventional MAC header includes a Logical channel ID in the MAC header of the present invention. Used as contents indication (MBS IND) 212, the CID MSB 204, which is the upper 1 byte of the CID field in the conventional MAC header, generally has the same value. Used as ID 222. For details of the conventional MAC header, refer to the standard standard "IEEE 802.16e".

In the case of FIG. 2, the standard of the MAC header for distinguishing the content ID from the MAC layer is changed. Next, a configuration of a PDU that enables content IDs to be distinguished from the MAC layer using subheaders defined in the standard without changing the standard will be described below with reference to FIG. 3.

FIG. 3 is a diagram illustrating a configuration of a protocol data unit including a subheader to distinguish content identifiers in a MAC layer according to an embodiment of the present invention. Referring to FIG. 3, the PDU 300 of the present invention includes a MAC header 310, a subheader 320, and a payload 330.

The MAC header 310 includes multicast connection ID (MCID) information, the subheader 320 includes information of a content identifier, an Extened subheader group length 302, an Rvd (reserved) 324, and an Extened. subheader type (326) and an extened subheader body (328).

Here, the extened subheader group length 302 is information about the total length of the subheader 302. The extened subheader type 326 is one of six types defined in the IEEE 802.16e standard. In the present invention, when a logical channel ID is used as a content identifier, an extened subheader type is used. If 1 is used and MBS contents ID is used as the content identifier, the reporter uses Extened subheader type 2 for the size of 2 bytes. The extened subheader body 328 is information about a content identifier of a logical channel ID or MBS contents ID.

4 is a diagram illustrating a configuration of a base station for a multicast / broadcast service in a broadband wireless access system according to an embodiment of the present invention. Referring to FIG. 4, the base station according to the present invention includes an MBS service transmitter 402, an MBS data processor 404, a traffic data processor 408, a signal data processor 410, a logical identifier indicator 406, and a PDU generator ( 412, a downlink burst generator 414 is configured.

The MBS service transmitter 402 transmits MBS data serviced by the base station to the MBS data processor 404. The MBS data processor 404 divides the MBS data received from the MBS service transmitter 402 into PDU units and provides the MBS data to the logical identifier indicator 406.

The logical identifier indicator 406 checks the content identifier of MBS data when receiving MBS data in units of PDUs from the MBS data processor 404, and configures information of a MAC header including the content identifier described with reference to FIG. Alternatively, information on the subheader including the content identifier described with reference to FIG. 3 is configured and transmitted to the PDU generator 412.

The PDU generator 412 generates a PDU including general data received from the traffic data processor 408 or a PDU including signal data received from the signal data processor 410. In addition, according to the present invention, a PDU including information of the MAC header or information of the subheader including the content identifier received from the logical identifier indicator 406 is generated and transmitted to the downlink burst generator 414. .

The downlink burst generator 414 generates and transmits an MBS burst including a plurality of MBS PDUs received from the PDU generator 412 to the mobile terminal.

5 is a diagram illustrating a configuration of a mobile terminal receiving a multicast / broadcast service in a broadband wireless access system according to an embodiment of the present invention. Referring to FIG. 5, the mobile terminal of the present invention includes a downlink burst receiver 502, a PDU detector 504, a logical identifier detector 506, an MBS data processor 508, an MBS service processor, and a traffic data processor 512. And a signal data processor 514.

The downlink burst receiver 502 receives a downlink burst, and the PDU detector 504 detects PDUs included in the received downlink burst, checks the MAC header of each detected PDU, and confirms whether it is BS data. Whether it is general traffic data or signal data, it is transmitted to the logical identifier detector 506 if it is MBS data, it is sent to the traffic data processor 512 if it is general traffic data, and the signal data processor 514 if it is signal data. To send).

The logical identifier detector 506 checks the MAC header or subheader of the PDU having the MBS data received from the PDU detector 504 to check the content identifier indicated by the MBS contents ID or the Logical channel ID. If the content identifier being received is transmitted to the MBS data processor 508, the content identifier being received is discarded if not. The configuration of the MAC header confirmed by the logical identifier detector 506 is described with reference to FIG. 2, and the configuration of the subheader is described with reference to FIG. 3.

The MBS data processor 508 checks the MBS data in the PDU received from the logical identifier detector 506 and provides the MBS data to the MBS service processor 510, and the MBS service processor 510 provides the MBS data. Provide MBS service.

Hereinafter, a multicast / broadcast service method for dividing a protocol data unit by contents ID in a MAC layer in a broadband wireless access system according to the present invention configured as described above will be described with reference to the accompanying drawings.

6 is a flowchart illustrating a process of performing a multicast / broadcast service at a base station of a broadband wireless access system according to an exemplary embodiment of the present invention. Referring to FIG. 6, when the base station of the present invention receives MBS data to be serviced in step 600, it proceeds to step 602 to identify configuration information of a PDU in which MCID (Multicast connection ID) and MBS data are divided into PDU units. In step 604, the controller identifies a content identifier indicated by the MBS contents ID or the logical channel ID. In step 606, the MBS PDU including the MAC header or the subheader including the content identifier is generated. . The configuration of the MAC header having the content identifier information included in the MBS PDU in step 606 refers to the description of FIG. 2, and the configuration of the subheader having the content identifier information refers to the description of FIG. 3.

Thereafter, the base station generates an MBS burst including the plurality of MBS PDUs generated in step 608 and transmits to the mobile terminal in step 610.

7 is a flowchart illustrating a process of receiving a multicast / broadcast service in a mobile terminal of a broadband wireless access system according to an exemplary embodiment of the present invention. Referring to FIG. 7, when the mobile terminal according to the present invention receives the downlink burst in step 700, the mobile terminal proceeds to step 702 to detect PDUs included in the received downlink burst, and proceeds to step 704 to detect each PDU. The MAC header is checked to determine whether the PDU is MBS data. If the result of the check is not MBS data, the corresponding function is performed for each data.

If the received PDU is a PDU having MBS data, the mobile terminal checks the multicast connection ID (MCID) and the content identifier in step 706. In step 708, the mobile terminal checks the MBS data of the PDU. Determines whether MBS is currently being serviced by the mobile terminal. That is, it is checked whether the PDU is a PDU assigned by the mobile terminal. If the PDU is not a PDU assigned to the mobile terminal as a result of the check in step 708, the mobile terminal proceeds to step 714 and discards the received PDU.

If the PDU is a PDU allocated to the mobile terminal as a result of checking in step 708, the mobile terminal proceeds to step 710 to detect a payload having substantial MBS data in the PDU, and proceeds to step 712 to receive the received MBS data. Provides multicast / broadcast service using.

Obviously, there are many ways within the scope of the claims to modify these embodiments. In other words, there can be many other ways in which the invention may be practiced without departing from the scope of the following claims.

1 illustrates a frame structure for a multicast and broadcast service according to the prior art;

2 is a diagram illustrating a configuration of a MAC header according to an embodiment of the present invention and a configuration of a MAC header according to a conventional standard;

3 is a diagram illustrating a configuration of a protocol data unit including a subheader to distinguish content identifiers in a MAC layer according to an embodiment of the present invention;

4 is a diagram illustrating a configuration of a base station for a multicast / broadcast service in a broadband wireless access system according to an embodiment of the present invention;

5 is a diagram illustrating a configuration of a mobile terminal receiving a multicast / broadcast service in a broadband wireless access system according to an embodiment of the present invention;

6 is a flowchart illustrating a process of performing a multicast / broadcast service at a base station of a broadband wireless access system according to an embodiment of the present invention;

7 is a flowchart illustrating a process of receiving a multicast / broadcast service in a mobile terminal of a broadband wireless access system according to an exemplary embodiment of the present invention.

Claims (20)

In the base station for multicast and broadcast services in a broadband wireless access system, An MBS data processor that divides multicast / broadcast service (MBS) data into protocol data units (PDUs); A logical identifier indicator for identifying a multicast connection ID (MCID) and a content identifier of the MBS data; And a PDU generator configured to generate the MBS data divided into PDU units by the MBS data processor into a PDU that can identify the content identifier in the MAC layer using the MCID and the content identifier identified by the logical identifier indicator. Base station, The method according to claim 1, The PDU generator, And the content identifier information is included in a MAC header of the PDU so that the content identifier can be identified by a MAC layer. 3. The method of claim 2, The content identifier included in the MAC header, A base station characterized in that it is a logical channel ID defined in a standard having a size of 1 byte. The method according to claim 1, The PDU generator, And configuring the PDU including a subheader having the content identifier information so that the content identifier can be identified in a MAC layer. 5. The method of claim 4, The content identifier that the subheader has, A base station characterized in that the logical channel ID defined in the standard specification having a size of 1 byte or MBS contents ID defined in the standard having a size of 2 bytes. A mobile terminal receiving multicast and broadcast services in a broadband wireless access system, A PDU detector for detecting a Protocol Data Unit (PDU) in a downlink burst, When the PDU detector detects an MBS PDU having Multicast / Broadcast Service (MBS) data, the MCDU checks the multicast connection ID (MCID) and the content identifier of the MBS PDU in the MAC layer. And a logical identifier processor for identifying whether the MBS PDU is an MBS serviced by the mobile terminal through the content identifier. The method according to claim 6, The logical identifier processor, And checking the content identifier information in the MAC header of the MBS PDU. 8. The method of claim 7, The content identifier included in the MAC header, A mobile terminal characterized in that it is a logical channel ID defined in a standard having a size of 1 byte. The method according to claim 6, The logical identifier processor, And identifying the content identifier information in the subheader of the MBS PDU. 10. The method of claim 9, The content identifier that the subheader has, A mobile terminal characterized in that it is a logical channel ID defined in a standard specification having a size of 1 byte or an MBS contents ID defined in a standard having a size of 2 bytes. In the method of the multicast and broadcast services in the base station of the broadband wireless access system, Receiving the Multicast / Broadcast Service (MBS) data; Dividing the received MBS data into protocol data units (PDUs); Checking a multicast connection ID (MCID) and a content identifier of the MBS data; And generating the PDU including the MBS data divided into PDU units and identifying the content identifier in the MAC layer. 12. The method of claim 11, The process of generating the PDU, And configuring the content identifier information in the MAC header of the PDU so that the content identifier can be identified by a MAC layer. 13. The method of claim 12, The content identifier included in the MAC header, Method of performing MBS in base station characterized in that it is Logical channel ID defined in standard standard having size of 1 byte. 12. The method of claim 11, The process of generating the PDU, And configuring the PDU including a subheader having the content identifier information so that the MAC layer can identify the content identifier. 15. The method of claim 14, The content identifier that the subheader has, A method of performing MBS in a base station characterized in that it is a logical channel ID defined in a standard having a size of 1 byte or MBS contents ID defined in a standard having a size of 2 bytes. In the method of receiving multicast and broadcast services in a mobile terminal of a broadband wireless access system, Detecting a protocol data unit (PDU) upon receiving a downlink burst, If the detected PDU is an MBS PDU having Multicast / Broadcast Service (MBS) data, identifying a multicast connection ID (MCID) and a content identifier of the MBS PDU in a MAC layer; And determining whether the MBS PDU is an MBS serviced by the mobile terminal through the MCID and the content identifier. 17. The method of claim 16, Checking the content identifier, And receiving the content identification information from the MAC header of the MBS PDU. 18. The method of claim 17, The content identifier included in the MAC header, A method of receiving MBS in a mobile terminal, which is a Logical channel ID defined in a standard having a size of 1 byte. 17. The method of claim 16, Checking the content identifier, And receiving the MBS from the mobile terminal, wherein the content identifier information is identified in a subheader of the MBS PDU. 20. The method of claim 19, The content identifier that the subheader has, A method of receiving MBS in a mobile terminal, characterized in that it is a Logical channel ID defined in a standard having a size of 1 byte or MBS contents ID defined in a standard having a size of 2 bytes.

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