KR20070042851A - Apparatus and method for support multicast/broadcast service in a broadband wireless access system - Google Patents

Abstract

The present invention relates to an apparatus and method for processing media data for supporting MBS in a broadband wireless access communication system. The present invention includes a plurality of base stations and at least one content server for transmitting various media traffic to the base stations. A traffic processing method for supporting a multicast / broadcast service (MBS) in a broadband wireless access communication system, comprising: reserving a resource for MBS burst allocation to the base station; and if the resource reservation is successful, Requesting traffic to be transmitted to the base station from the content server; multiplexing and shaping the traffic transmitted from the content server; and transmitting the multiplexed and shaped traffic to the base station. Characterized by The.

Broadband Wireless Access System, Mobile Internet, MBS, Multiplexing, Shaping, Media, CBR

Description

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

1 is a diagram schematically illustrating a network configuration of a system for providing MBS in a general broadband wireless access system;

2 is a diagram schematically illustrating a network configuration of a system for providing MBS in a general broadband wireless access system;

3 is a diagram schematically illustrating a network configuration of a system for providing MBS in a broadband wireless access system according to an embodiment of the present invention;

4 is a diagram illustrating a base station control process for providing an MBS in a broadband wireless access system according to an embodiment of the present invention;

5 is a diagram schematically illustrating a traffic processing procedure in a broadband wireless access system according to an embodiment of the present invention;

6 is a diagram illustrating an MBS providing procedure in a broadband wireless access system according to an embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broadband wireless access (BWA) system, and in particular, to a mobile station (MS) in a broadband wireless access system, a multicast and broadcast service (hereinafter, referred to as 'MBS'). An apparatus and a method for providing the (then referred to as ").

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 that can efficiently provide 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.

The broadband wireless access system is a system for integrating and supporting not only voice but also various low speed and high speed data services and multimedia application services such as high definition video. These broadband wireless access systems are based on wireless media using broadband such as 2 GHz, 5 GHz, 26 GHz and 60 GHz, and are used in public or switched public switched telephone networks (PSTN) and public switched data networks (PSDN) in mobile or fixed environments. Network, Internet, IMT-2000 (International Mobile Telecommunication-2000) network, Asynchronous Transfer Mode (ATM, Asynchronous Transfer Mode) network, etc., can be connected to a wireless communication system that can support channel rates of 2Mbps or more to be. The broadband wireless access system may be classified into a broadband wireless subscriber network, a broadband mobile access network, and a high-speed wireless local area network (LAN) according to a terminal's mobility (fixed or mobile), communication environment (indoor or outdoor), and channel rate. have.

In addition, the wireless access method of the broadband wireless access system is being standardized by the IEEE 802.16 standardization group of the Institute of Electrical and Electronics Engineers (IEEE), one of the international standardization organizations. In order to provide wireless broadband Internet services for fixed or mobile terminals, the IEEE 802.16d and IEEE 802.16e standards are being enacted. In particular, to support high-speed services in the form of guaranteeing mobility and various Quality of Service (QoS) to a broadband wireless access communication system such as the wireless LAN communication system and a wireless metropolitan area network (MAN) communication system. The researches are being actively conducted, and representative systems thereof are IEEE 802.16d communication system and IEEE 802.16e communication system (hereinafter, referred to as 'IEEE 802.16d / e communication system').

The IEEE 802.16d / e communication system uses orthogonal frequency division multiplexing (OFDM) scheme and orthogonal to support a broadband transmission network on a physical channel of the wireless MAN system. A communication system employing an Orthogonal Frequency Division Multiple Access (hereinafter, referred to as 'OFDMA') scheme. Here, the IEEE 802.16d communication system is a system in which a subscriber station (SS) is currently fixed, that is, a state in which the mobility of the subscriber station is not considered at all and only a single cell structure is considered. In contrast, the IEEE 802.16e communication system is a system that considers the mobility of the subscriber station in the IEEE 802.16d communication system. Hereinafter, the subscriber station having the mobility is referred to as a mobile terminal (MS).

The IEEE 802.16d / e communication system can perform a lot of data transmission in a short time due to the wide bandwidth of data transmission compared to the wireless technology for the conventional voice service, and efficiently share the channel by sharing all user channels It is possible to use. In addition, quality of service (QoS) is guaranteed so that users can receive various services of different quality according to the characteristics of the service. In the IEEE 802.16e communication system, all users connected to a base station share and use a common channel, and a period in which each user uses a channel is allocated by the base station every uplink and downlink frame. Therefore, the base station should inform each user of uplink and downlink access information so that each user can divide and use a channel every frame.

To this end, in the IEEE 802.16e communication system, channel information is divided into an uplink channel and a downlink channel, information about each channel is defined as a TLV (Type, Length, Value), and the defined TLV is a downlink channel descriptor (DCD). By including the message and the Uplink Channel Descriptor (UCD) message to all the users at regular intervals to inform the mobile terminal of the characteristic information about the channel.

Meanwhile, the 802.16 communication system may provide a service for multicast and broadcast (Multicast / Broadcast Service, hereinafter referred to as 'MBS'). The MBS is divided into a single base station access method (hereinafter referred to as 'single-BS access') and a multi base station access method (hereinafter referred to as 'multi-BS access') according to the service access method of the mobile terminal. Divided.

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. Hereinafter, a network configuration of a system for providing the MBS will be described with reference to FIGS. 1 and 2.

1 and 2 are schematic diagrams illustrating a system configuration for providing MBS in a general broadband wireless access system. In particular, FIG. 1 illustrates a network configuration when using a single-BS access method, and FIG. 2 illustrates a network configuration when using a multi-BS access method.

As shown in FIG. 1 and FIG. 2, first, a network configuration for providing an MBS in a broadband wireless access system according to the prior art, according to the service connection method of the mobile terminal as described above, is shown in FIG. -BS access method and multi-BS access method shown in FIG.

That is, FIG. 1 illustrates a single-BS access method in which each of the mobile terminal, for example, the first mobile terminal 101 and the second mobile terminal 103 is provided with MBS from one base station to which it belongs, for example, the base station 110. The network configuration in the case of use is shown. 2 illustrates that a mobile terminal, for example, a second mobile terminal 203 simultaneously receives MBS from two base stations, for example, a base station to which it belongs, that is, a first base station 210 and a neighbor base station 230, that is, a second base station 230. It shows the network configuration in case of using multi-BS access method. In addition, in FIG. 2, the first mobile terminal 201 and the third mobile terminal 205 may each use a single-BS access method from one base station to which they belong, that is, the first base station 210 and the second base station 230. MBS can be provided.

As described above, in the multi-BS access method, unlike the single-BS access method, the mobile terminal should be registered in both the base station for providing MBS, for example, the first base station 210 and the second base station 230. no need.

That is, when the mobile terminal needs to receive the actual service, a connection for the MBS is generated between the base station and the mobile terminal through a service allocation procedure such as Dynamic Service Addition (DSA). At this time, the mobile terminal receives MBS Contents Identifier TLV encoding information to obtain MBS connection information.

Accordingly, the mobile terminal uses different MBS Contents Identifier TLV encoding information to connect different connection identifiers (Connection ID, hereinafter referred to as "CID") or different security agreements (hereinafter, referred to as "SA"). Through this, the same multicast and broadcast service area can be distinguished. This multicast and broadcast service area is hereinafter referred to as MBS zone (MBS_ZONE).

That is, the MBS_ZONE is used to indicate that broadcast and multicast service flows are available through the CID and SA. Accordingly, the base station broadcasts MBS_ZONE information to the mobile terminal through, for example, the above-described DCD message. That is, the MBS_ZONE may be referred to as a base station group that uses the same CID and SA to transmit contents.

Meanwhile, as described above, in order to provide an MBS to a mobile terminal using the multi-BS access method, synchronizations of media information transmitted from a predetermined content server in the MBS-ZONE and a frame transmitted by the base station are provided. The locations of the bursts assigned to the frame must also be the same. In general, since the characteristics of the media transmitted from the content server, such as the characteristics of the traffic (traffic) is very diverse, it is difficult to properly allocate a burst to a plurality of base stations for each of the traffic.

However, there is no reference to the apparatus or method for solving the above-described problems according to the prior art. Therefore, in order to provide a smooth MBS to a mobile station from a base station in a broadband wireless access system, a scheme for matching the media information synchronization and the location of the burst and a burst allocation scheme corresponding to the various traffic characteristics are required.

Accordingly, an object of the present invention is to provide an apparatus and method for processing media traffic for providing an efficient MBS to a mobile terminal in a broadband wireless access system.

Another object of the present invention is to provide an apparatus and method for providing MBS according to a multi-BS access method to a mobile terminal in a broadband wireless access system.

Another object of the present invention is to provide an apparatus and method for synchronizing and transmitting a plurality of media information to a plurality of base stations in MBS_ZONE in a broadband wireless access system.

It is still another object of the present invention to provide an apparatus and method for allocating bursts according to a plurality of media characteristics in a broadband wireless access system.

Method according to an embodiment of the present invention for achieving the above objects; A traffic processing method for supporting a multicast / broadcast service (MBS) in a broadband wireless access communication system including a plurality of base stations and at least one content server transmitting various media traffic to the base stations, the method comprising: Reserving a resource for MBS burst allocation; if the resource reservation is successful, requesting traffic to the base station to transmit to the content server; and multiplexing and shaping for the traffic transmitted from the content server. And transmitting the multiplexed and shaped traffic to the base station.

Method according to an embodiment of the present invention for achieving the above objects; Supporting multicast / broadcast service (MBS) in a broadband wireless access communication system including a mobile terminal, a content server providing various media information, a predetermined controller for delivering the media information to a base station, and a plurality of base stations A method for reserving a resource for MBS burst allocation from the controller to all base stations located in the same MBS zone, and the base stations located in the same MBS zone are allocated in response to the MBS burst allocation request. Transmitting information with the flag set as a predetermined flag to the controller; requesting, by the controller, media to be transmitted to the base stations from the content server if the MBS burst is allocated; When a media stream corresponding to the request is received, the media stream Multiplexing and shaping a rim to transmit the multiplexed and shaped media streams to base stations in the same MBS zone, and transmitting the multiplexed and shaped media streams to the mobile terminal; Receiving each transmitted media stream, and combining and receiving each received media stream to a user.

An apparatus according to an embodiment of the present invention for achieving the above objects; A traffic processing apparatus for supporting a multicast / broadcast service (MBS) in a broadband wireless access communication system including at least one content server transmitting various media traffics, the apparatus comprising: reserving a resource for MBS burst allocation and the content; And a MBS controller for requesting traffic to be transmitted to a server, and multiplexing and shaping the traffic transmitted from the content server.

A system according to an embodiment of the present invention for achieving the above object; A system for supporting a multicast / broadcast service (MBS) in a broadband wireless access communication system including a plurality of base stations and at least one content server transmitting various media streams to the base stations, wherein the MBS bursts are allocated to the base stations. MBS for resource reservation and requesting media to be transmitted to the base station to the content server, and when a corresponding media stream is received, converting the media stream into an MBS media stream through multiplexing and shaping processing and transmitting the media stream to the base station. The controller provides burst information requested by the MBS controller, informs the availability of resource reservation for MBS burst allocation requested by the MBS controller through a predetermined flag setting, and transmits the MBS media stream to the mobile terminal. Ha The respective receiving and combining the MBS data transmitted from the media and a plurality of the base station, multiple base stations and a mobile terminal provided to the user.

An apparatus according to an embodiment of the present invention for achieving the above objects; A traffic processing apparatus for supporting a multicast / broadcast service (MBS) in a broadband wireless access communication system including at least one content server transmitting various media traffics, comprising: resource reservation and MBS burst allocation; And an MBS controller for requesting traffic to be transmitted to the server, multiplexing and shaping the traffic transmitted from the content server, and generating a medium access control (MAC) packet data unit (PDU).

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that in the following description, only parts necessary for understanding the operation according to the present invention will be described, and descriptions of other parts will be omitted so as not to distract from the gist of the present invention.

The present invention proposes a multicast and broadcast service (hereinafter referred to as 'MBS') to a mobile station (MS) by a base station (BS) in a broadband wireless access (BWA) system. An apparatus and a method for providing the (then referred to as "). In particular, the present invention proposes an apparatus and method capable of synchronously delivering media information transmitted from a plurality of content servers to a plurality of base stations in MBS_ZONE. To this end, the present invention proposes an MBS controller and a traffic processing method of the MBS controller to synchronize the synchronization.

That is, the present invention defines the function of the MBS controller for providing MBS in a broadband wireless access system, and also process the traffic of a plurality of content servers through the function of traffic shaping and multiplexing (multiplexing) efficiency To provide professional services.

According to an embodiment of the present invention, the MBS controller for controlling the base stations in the MBS_ZONE constantly controls the traffic pattern to be transmitted through traffic multiplexing and shaping, and a reservation message for assigning bursts to a plurality of base stations Message) to synchronize media information.

On the other hand, the present invention described below is applied to the IEEE 802.16 system of the broadband wireless access system as one embodiment will be described. However, the present invention is not limited thereto, and of course, the present invention can be applied to all other communication systems providing MBS. Next, preferred operating embodiments for providing the MBS proposed by the present invention will be described with reference to the accompanying drawings.

3 is a diagram schematically illustrating a network configuration of a system for providing MBS in a broadband wireless access system according to an embodiment of the present invention.

As shown in FIG. 3, the MBS providing system according to the embodiment of the present invention includes a mobile terminal (MS) 310, a plurality of base stations, such as a first base station (BS) 320 and a second base station 330. ), A back haul 340, an MBS controller 350, and a plurality of content servers 360.

Referring to FIG. 3, the first base station 320 and the second base station 330 are base stations included in the same MBS_ZONE, and the first base station 320 and the second base station 330 in the MBS controller 350. ) Is controlled through the backhaul 340. Here, the backhaul 340 generally means a network capable of delivering data up to a point that can be distributed through a network or a network backbone network.

The content server 360 provides various media information, and the media information provided from the content server 360 is again transmitted through the MBS controller 350 to the base station, for example, the first base station 320. Or it is delivered to the second base station 330.

The mobile terminal 310 is simultaneously provided with MBS from the base stations, that is, the first base station 320 and the second base station 330 in a multi base station connection (hereinafter, referred to as 'multi-BS access').

Hereinafter, the MBS providing method according to the embodiment of the present invention through the above configuration will be described.

First, the mobile terminal 310 simultaneously receives a frame from the first base station 320 and the second base station 330. Accordingly, according to an embodiment of the present invention, the mobile terminal 310 can obtain a gain by combining a radio frequency (hereinafter, referred to as 'RF'). In this case, in order to obtain the RF combining gain, the first base station 320 and the second base station 330 must be preceded by synchronization for MBS.

Here, looking at the parameters (parameters) used for the synchronization can be represented as shown in Table 1 below.

As shown in Table 1, the parameters used for synchronization may be divided into static parameters and dynamic parameters. The static parameter includes frequency assignment information, time information, sub-channelizing information, permutation information, and the like. The dynamic parameter includes burst assignment information, frame information, symbols, sub-channel information, and the like.

Meanwhile, in the present invention, the base stations, for example, share information as shown in Table 1 for synchronization between the first base station 320 and the second base station 330 shown in FIG. In order to control the 320 and 330, the MBS controller 350 as described above is included.

The MBS controller 350 according to an embodiment of the present invention transmits various media information transmitted from the plurality of content servers 360 to each base station in the MBS_ZONE, for example, the first base station 320 and the second base station 330. To deliver, perform the following functions. That is, the MBS controller 350 performs functions such as collecting information of media transmitted from the content server 360, collecting burst information of a base station, processing a trap, and scheduling an MBS burst allocation of a base station. In particular, the MBS controller 350 controls a scheduler of the base station to synchronize the burst allocation information. In this case, as a method for controlling the scheduler of the base station, the MBS controller 350 uses an MBS burst reservation method.

Next, a specific operation embodiment for providing an MBS according to an embodiment of the present invention will be described. First, a process of providing a media stream to a mobile terminal through multicast with reference to FIG. 4 will be described.

4 is a diagram illustrating a base station control procedure for providing an MBS according to an embodiment of the present invention. In particular, FIG. 4 illustrates a signal flow diagram for controlling a scheduler of each base station existing in MBS_ZONE in the MBS controller according to an embodiment of the present invention.

Referring to FIG. 4, first, the MBS controller 430 transmits a media information request message to the content server 450 (step 401), and then the content server in response to the request. In step 403, a media information response message is received from 450. When the MBS controller 430 receives a media information response message from the content server 450, when the MBS controller 430 needs to transmit media provided by the content server 450 to the base stations 410 in MBS_ZONE, the base stations 410. In step 405, an Admission Request message for the burst information request is transmitted. Thereafter, an admission response message is received from the base stations 410 in response to the burst information request (step 409).

Next, when the MBS controller 430 receives the grant response message from the base stations 410, the MBS controller 430 determines an area for actual MBS burst allocation using the received information from the base stations 410 in the MBS_ZONE. Thereafter, an MBS Burst Reservation Request message is transmitted to the base stations 410. Subsequently, when the reservation for the MBS burst is possible in response to the MBS burst reservation request, the base stations 410 transmits an MBS Burst Reservation Response message to the MBS controller 430 (step 411). .

Next, when the reservation for all base stations 410 in MBS_ZONE is successfully completed, the MBS controller 430 sends a media request to the content server 450 to transmit media to the base stations 410. Request) message is transmitted (step 413). Subsequently, the content server 450 transmits a media response message in response to the media request of the MBS controller 430 (step 415), and the content server 450 then stores the requested media. The MBS controller 430 transmits to the MBS controller 430.

Next, when media is transmitted from the content server 450, the MBS controller 430 transmits MBS media to the base stations 410 after traffic multiplexing and shaping the transmitted media (step 419). do. Since the traffic multiplexing and shaping processing will be described later, a detailed description thereof will be omitted.

Hereinafter, a signal transmission process between a base station, an MBS controller, and a content server for transmitting media to a mobile terminal by the base station as described above will be described in more detail.

As shown in FIG. 4, the MBS controller 430 according to an embodiment of the present invention may first provide the content server 450 using a 'media information request message' and a 'media information response message'. A list of contents and information on traffic characteristics of the contents are managed (steps 401 and 403). In this case, when the MBS controller 430 needs to transmit streaming media to all base stations in the MBS_ZONE, for example, the base station 410, the MBS controller 430 may allocate the MBS burst to the base station 410. You need to check in advance if there is an area.

To this end, the MBS controller 430 transmits an authorization request message to the base station 410 in step 405 and requests the burst information available to the base station 410 (step 405). Then, the base station 410 transmits burst information for the MBS to the MBS controller 430 through an acknowledgment message in response to the acknowledgment request message (step 407).

The MBS controller 430 then determines an actual MBS burst allocation region using information collected from the base stations in the MBS_ZONE, for example, the base station 410, and includes the determination information in an MBS burst reservation request message. Transmit to step 410 (step 409). In this case, the MBS controller 430 may include a start frame, a frame allocation period, a frame duration, a start symbol, and a start symbol for indicating the determined allocation region. MBS bursts are reserved by transmitting information such as an end symbol, a start subchannel, and an end subchannel to the base station 410 by including them in the MBS burst reservation request message.

Next, in response to receiving the MBS burst reservation request message, the base station 410 transmits an MBS burst reservation response message to the MBS control 430 (step 411). In this case, when the MBS burst requested by the MBS controller 430 is available, the base station 410 sets a "Success" flag in the MBS burst reservation response message, and the reservation for the MBS burst is performed. In case of failure, the " Fail " flag is set in the MBS burst reservation response message and transmitted to the MBS controller 430.

In this case, when the reservation for the MBS burst fails, the MBS controller 430 newly determines the MBS burst allocation area, and then again transmits an MBS burst reservation request message to all base stations 410 in the MBS_ZONE.

In contrast, when a reservation for MBS burst is successful for all base stations 410 in the MBS_ZONE, the MBS controller 430 sends a media to the content server 450 to transmit a media stream to the base station 410. The request message is transmitted (step 413). Then, the content server 450 transmits a media response message to the MBS controller 430 in step 415 in response to the media request message, and then transmits a media stream to the MBS controller 430 in step 417. ).

Then, the MBS controller 430 generates an MBS media stream to the base station 410 through a process of traffic multiplexing and shaping the media stream transmitted from the content server 450. Send (step 419).

Meanwhile, FIG. 4 shows a configuration in which the base station and the MBS controller transmit and receive messages through separate configurations.

Hereinafter, a traffic processing method performed by the MBS controller 430, that is, a traffic multiplexing and shaping processing procedure for the media stream transmitted from the content server 450 will be described in more detail.

5 is a diagram schematically illustrating a traffic processing procedure according to an embodiment of the present invention.

Referring to FIG. 5, first, although traffic characteristics of media information transmitted by the content server 510 vary, traffic characteristics in the case of streaming media often have a pattern of Variable Bit Rate (VBR). In other words, instead of continuously transmitting data of a constant size at a constant period, as in the forms of the media streams 501, 503, and 505 shown in FIG. Have

However, in the case of the media having the pattern of VBR as described above, the base station 550 determines the burst allocation period and the location and size of the burst to be reserved for the actual MBS burst because the allocation size of the burst is not constant. It becomes very difficult.

Therefore, in the MBS controller 530 according to the present invention, the multiplexing 507 is performed on the streaming media transmitted from the plurality of content servers 510, and again, the constant bit rate (CBR) is constant. In operation 509, shaping is performed. That is, when the multiplexing and shaping of the streaming media through the MBS controller 530 as described above, as shown in the reference numeral 509 shown in FIG. It can be processed in the form of traffic with a certain period and a certain size.

Therefore, according to the proposed embodiment of the present invention, it is possible to clarify the allocation interval and the period of the MBS burst to be reserved to each base station 550 for the media stream. Next, a traffic processing method of the MBS controller will be described with reference to FIG. 6.

6 is a flowchart illustrating a traffic processing method in an MBS controller according to an embodiment of the present invention.

As shown in FIG. 6, the MBS controller requests media information request / response of the media server, assignable area confirmation request / response process of the base station, MBS burst allocation area determination process, MBS burst reservation request / response process, media. Request / response process, traffic multiplexing and shaping process, and passing the processed media stream to the base station.

Referring to FIG. 6, in step 601, the MBS controller requests media information from a content server. Thereafter, when the response is transmitted from the content server, in step 603, it is checked whether there is an MBS burst allocation capable region of the base station. At this time, the MBS controller checks the MBS burst allocation possible region of the base station through an authorization request message and an authorization request response message.

Next, in step 605, the MBS controller collects burst information of the base station through a response message transmitted from the base station, and determines the MBS burst allocation region using the collected information. In step 607, the MBS controller transmits the determination information to the base station by including the MBS burst reservation request message. Then, when the response is transmitted from the base station, in step 609 it is determined whether the reservation is successful for the MBS burst.

In this case, if the reservation of the MBS burst fails in step 609, the MBS controller proceeds to step 605 to determine a new MBS bus allocation area and sends an MBS burst reservation request message to the base station. Resend. If the reservation of the MBS burst is successful, the MBS controller proceeds to step 611 to transmit a media request message to the content server.

Then, when the response to the annoying request and the corresponding media is transmitted from the content server, the MBS controller performs traffic multicasting and shaping processing on the delivered media in step 613. Finally, in step 615, the MBS controller transmits the multicasting and shaped traffic to each base station.

Meanwhile, in the MBS service providing method, when the MBS controller sends traffic processed data to all base stations in the MBS zone in the form of an IP packet, each base station forms a MAC PDU (Packet Data Unit) and transmits the data to the mobile terminal. . However, at this time, the MAC PDU generated for each base station may be different due to the influence of each base station or other traffic. That is, the MAC PDU received by the mobile terminal is changed due to fragmentation or packing when generating the MAC PDU.

Therefore, an embodiment of the present invention proposes a method of making the MAC PDU in the MBS controller as described above to improve this.

In order to make the MAC PDU in the MBS controller, the MBS controller preferably includes the following functions in addition to the functions described above.

-Classification and header compression of CS (Convergence Sublayer) layer

-MAC PDU generation function of MAC layer

The CS layer performs a role of classifying data transferred from an upper layer and mapping the data to an appropriate connection, and serves as a sub-layer responsible for joining layers, such as compressing data. That is, since the help of the CS layer is required to generate the MAC PDU, the MBS controller includes a CS layer function and a function of generating a MAC PDU.

In the embodiment of the present invention, by including the above function in the MBS controller, the MBS controller processes the traffic and then converts the MAC PDU back to the base station in the MBS zone. The base station which receives this is transmitted to the mobile terminal through modulation and encoding without going through a separate MAC PDU generation process.

As described above, in the detailed description of the present invention has been described with respect to specific embodiments, various modifications are of course possible without departing from the scope of the invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the claims below, but also by the equivalents of the claims.

As described above, according to the apparatus and method for supporting MBS in the broadband wireless access system of the present invention proposed by the present invention, multiplexing and shaping of VBR-type media streaming traffic through an MBS controller for controlling a plurality of base stations It converts to CBR form by processing, and also has an advantage of providing effective MBS to users through resource reservation process for MBS burst allocation to each base station. In addition, by generating the MAC PDU in the MBS controller, it is possible to reduce processing waste that each base station needs to separately generate the same data transmitted by the streaming server. In addition, since the MAC PDUs received by the mobile terminal through the MBS service are all the same, if the data received by the mobile terminal is different when the multi-BS access method is used, the RF combining effect cannot be obtained. Can be.

Claims (26)

A traffic processing method for supporting a multicast / broadcast service (MBS) in a broadband wireless access communication system including a plurality of base stations and at least one content server transmitting various media traffic to the base stations, Reserving resources for MBS burst allocation to the base station; If the resource reservation is successful, requesting traffic to be transmitted to the base station from the content server; Multiplexing and shaping the traffic transmitted from the content server; And transmitting the multiplexed and shaped traffic to the base station. The method of claim 1, The traffic processing method for supporting the MBS includes managing a list of traffic that the content server can provide and information on the characteristics of the traffic. The method of claim 1, The process of reserving resources for the MBS burst allocation, Receiving a request for burst information available to the base station and a response corresponding thereto; Determining an allocation area of the MBS burst in response to the response received from the base station; And transmitting the determined allocation area information to the base station to reserve resources for MBS burst allocation. The method of claim 1, And if the resource reservation for the MBS burst allocation fails, determining a new MBS burst allocation region, and re-reserving the resource reservation to the base station. The method of claim 1, In the multiplexing and shaping process, a traffic pattern for converting a variable bit rate (VBR) type of traffic transmitted from the content server into a constant bit rate (CBR) type is provided. Way. The method of claim 1, The multiplexing and shaping process converts the traffic into a traffic form having a predetermined period and a predetermined size for the traffic. Supporting multicast / broadcast service (MBS) in a broadband wireless access communication system including a mobile terminal, a content server providing various media information, a predetermined controller for delivering the media information to a base station, and a plurality of base stations In the method for Reserving resources for allocating MBS bursts to all base stations located in the same MBS zone in the controller; Transmitting, by the base stations located in the same MBS zone, information indicating whether the allocation is possible with a predetermined flag according to the MBS burst allocation request to the controller; The controller requesting media to be transmitted to the base stations from the content server if the MBS burst allocation is possible; When the media stream corresponding to the request is received from the content server, multiplexing and shaping the media stream and transmitting the same to the base stations of the same MBS zone; The base stations transmitting the multiplexed and shaped media streams to the mobile terminal; And receiving each of the media streams transmitted to the base stations of the same MBS zone, and combining and receiving the received media streams to a user. The method of claim 7, wherein The method includes managing a list of media that can be provided by the content server and information on characteristics of the media. The method of claim 7, wherein The process of reserving resources for the MBS burst allocation, Receiving a request for burst information available to the base station and a response corresponding thereto; Determining an allocation area of the MBS burst in response to the response received from the base station; And transmitting the determined allocation area information to the base station to reserve a resource for MBS burst allocation. The method of claim 7, wherein And if the resource reservation for the MBS burst allocation fails, determining a new MBS burst allocation region and re-reserving the resource reservation to the base station. The method of claim 7, wherein The multiplexing and shaping process may include converting a traffic pattern into a constant bit rate (CBR) form for a variable bit rate (VBR) type of traffic transmitted from the content server. The method of claim 7, wherein The multiplexing and shaping process converts the media stream into a media stream having a predetermined period and a predetermined size. A traffic processing apparatus for supporting a multicast / broadcast service (MBS) in a broadband wireless access communication system including at least one content server for transmitting various media traffic, MBS controller to reserve resources for MBS burst allocation and request the traffic to be transmitted to the content server, and multiplexing and shaping the traffic transmitted from the content server to provide the MBS controller for supporting MBS Traffic processing unit. The method of claim 13, The MBS controller includes a function for managing a list of traffic that can be provided by the content server and the information on the characteristics of the traffic. The method of claim 13, The MBS controller determines the allocation area of the MBS burst, and the traffic processing apparatus for supporting the MBS, characterized in that for reserving resources for the MBS burst allocation in accordance with the determination information. The method of claim 13, When the resource reservation for the MBS burst allocation fails, the MBS controller determines a new MBS burst allocation region and re-reserves the resource reservation for the MBS burst allocation in accordance with the new determination information. Traffic processing device for supporting the. The method of claim 13, The MBS controller is a traffic processing apparatus for supporting MBS, characterized in that for converting the VBR (Variable Bit Rate) type of traffic transmitted from the content server into a constant bit rate (CBR) form of a constant traffic pattern. The method of claim 13, The MBS controller is a traffic processing apparatus for supporting MBS, characterized in that for converting the traffic form having a certain period and a predetermined size for the traffic. A system for supporting a multicast / broadcast service (MBS) in a broadband wireless access communication system comprising a plurality of base stations and at least one content server transmitting various media streams to the base stations, Resource reservation for MBS burst allocation to the base station and requesting the media to be transmitted to the base station to the content server, and when the corresponding media stream is received, the media stream is converted into an MBS media stream through multiplexing and shaping processing. MBS controller for transmitting to the base station, Providing the burst information requested by the MBS controller, indicating whether or not the resource reservation for MBS burst allocation requested by the MBS controller is possible through a predetermined flag setting, and transmitting the MBS media stream to the mobile terminal; With base stations, And a mobile terminal for receiving and combining MBS media data transmitted from the plurality of base stations, and providing the user with the MBS media data, respectively. The method of claim 19, The MBS controller includes a function of managing a list of media that can be provided by the content server and information on characteristics of the media. The method of claim 19, The MBS controller requests burst information available to the plurality of base stations, determines an allocation area of the MBS burst in accordance with information received from the base station, and transmits the determination information to the plurality of base stations to transmit the MBS burst. System for supporting MBS, characterized in that to reserve resources for allocation. The method of claim 19, And when the resource reservation for the MBS burst allocation fails, the MBS controller determines a new MBS burst allocation region and re-reserves the resource to the base station. The method of claim 19, The MBS controller is a system for supporting MBS, characterized in that for converting the VBR (Variable Bit Rate) -type media stream transmitted from the content server to a constant bit rate (CBR) form of the media stream pattern. The method of claim 19, The MBS controller is a system for supporting MBS, characterized in that for converting the media stream in the form of a media stream having a certain period and a predetermined size. The method of claim 19, The plurality of base stations are base stations located in the same MBS zone (zone), the system for supporting MBS. A traffic processing apparatus for supporting a multicast / broadcast service (MBS) in a broadband wireless access communication system including at least one content server transmitting various media traffic, Resource reservation for MBS burst allocation and requesting traffic to be transmitted to the content server, multiplexing and shaping the traffic transmitted from the content server, and generating a medium access control (MAC) packet data unit (PDU) Traffic processing apparatus for supporting the MBS, characterized in that it comprises an MBS controller.

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