KR20080076209A - Apparatus and method of broadcasting channel changing for multicast and broadcast service in broadband wireless access system - Google Patents

Abstract

An apparatus and a method for changing an MBS(Multicast and Broadcast Service) broadcast channel in a broadband wireless access system are provided to reduce a channel zapping time for changing a channel. When a user selects a desired MBS channel through a terminal(500), the terminal transmits an MBS control message to a BS(Base Station)/BSC(Base Station Controller)(501). The BS/BSC recognizes that the message is for selecting a particular MBS channel and performs a BS-init DSC(Dynamic Service Change) procedure(502). The BS/BSC transmits a DSC-REQ(Request) message to the terminal(503). The terminal recognizes that the channel section has been successfully performed and transmits a DSC-RSP(Response) message to the BS/BSC(504) and receives a DSC-ACK(Acknowledge) message from the BS/BSC(505). The terminal of the user transmits an MBS control message to the BS/BSC(506). The BS/BSC recognizes the message is for changing a particular MBS channel and performs a BS-init DSC procedure for the terminal(507). The BS/BSC transmits a DSC-REQ message to the terminal(508). The terminal transmits a DSC-RSP message to the BS/BSD(509) and receives a DSC-ACK message(510). The terminal receives an MBS control message from the BS/BSC(511). The BS/BSC recognizes that the message is for terminating the particular MBS channel and performs BS-init DSC for the terminal(512). The BS/BSC transmits a DSC-REQ message to the terminal(513). The terminal transmits a DSC-RSP message to the BS/BSC(514) and receives a DSC-ACK message from the BS/BSC(515).

Description

Channel switching apparatus and method for multicast and broadcast service broadcasting channel in a broadband wireless access system

1 is a diagram illustrating a network structure for providing an MBS service of a broadband wireless access system according to the present invention;

2 is a diagram illustrating a network entry and MBS service initialization process in a broadband wireless access system;

3 is a flowchart illustrating a procedure for generating a separate service flow and setting MBS channel information for an MBS service in a terminal of a broadband wireless access system;

4 is a flowchart illustrating a procedure of creating a separate service flow and setting MBS channel information for an MBS service in a base station controller of a broadband wireless access system;

5 is a diagram illustrating a process of selecting / changing an MBS channel and terminating a service in a broadband wireless access system;

6 is a flowchart illustrating a procedure of selecting / changing an MBS channel and terminating a service in a terminal of a broadband wireless access system;

7 is a flowchart illustrating a procedure of selecting / changing an MBS channel and terminating a service in a base station controller of a broadband wireless access system.

The present invention relates to a broadband wireless access system, and more particularly, to a channel switching apparatus and method for a multicast and broadcast service (MBS) broadcasting channel.

In general, communication systems have been developed mainly for voice services, and are gradually developing into communication systems capable of not only voice but also data services and various multimedia services. However, the voice-oriented communication system has not satisfied the rapidly increasing user's service needs due to the relatively small transmission bandwidth and high usage fee. 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. As a result, it has been introduced into a broadband wireless access system for efficiently providing Internet services with broadband enough to meet the demand of rapidly increasing 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. The broadband wireless access system is based on a wireless medium using broadband such as 2GHz, 5GHz, 26GHz and 60GHz, in a mobile or fixed environment, public switched telephone network (PSTN), public switched data network (PSDN), internet network, IMT2000 network, It is a wireless communication system that can connect ATM (Asynchronous Transfer Mode) network and can support channel rates of 2Mbps or more. 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 terminal mobility (fixed or mobile), communication environment (indoor or outdoor), and channel transmission rate. .

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, one of the international standardization organizations. Compared to the conventional wireless technology for the voice service, the IEEE 802.16 standard has a wider bandwidth of data and can transmit a lot of data in a short time, and all users can efficiently use the channel by sharing a channel (or resource). Do. In addition, quality of service (QoS) is guaranteed so that users can receive different quality services according to the characteristics of the service.

In the IEEE 802.16 system, a multicast and broadcast service (hereinafter, referred to as an MBS) service standard capable of providing multicast and broadcast to a plurality of mobile terminals exists. In the MBS standard, the same multicast and broadcast service area may be distinguished through different connection identifiers (CIDs) or different security associations (SAs). Here, MBS zone (MBS_ZONE) is used to indicate that the broadcast and multicast service flow is valid through the CID and SA, the base station is a Downlink Channel Descriptor (hereinafter referred to as 'DCD') message MBS zone information is broadcasted through. That is, the MBS zone may be referred to as a base station group that uses the same CID and SA to transmit content.

In order to receive the MBS service, the system requires a procedure for accessing a network, a procedure for receiving broadcast-related information from an MBS controller, a procedure for acquiring a right to receive a broadcast service, and a procedure for selecting / changing a broadcast In addition, the user terminal performs the above procedure in conjunction with the base station, the base station controller and the MBS controller. In addition, the user terminal does not directly join a multicast group to receive broadcast data from the MBS controller, but the base station performs a procedure of joining a plurality of multicast groups.

In this case, when the user selects a channel, a procedure of generating a service flow having a multicast connection identifier (hereinafter, referred to as a 'multicast CID') allocated to each channel is needed, and the user changes a channel. In this case, a procedure of creating a service flow having a different multicast CID and changing or deleting an existing service flow is required. In this case, in order to generate / change / delete the service flow, transmission and reception of a control signal between the terminal and the base station control period is required.

The generation / change of the service flow refers to the switching of a channel in the concept of broadcasting, and the time required is called a channel zapping time. When the user switches channels, generation of a new service flow is required, and at this time, a time longer than a channel zapping time realized in a normal broadcast is required. Accordingly, there is a need for a channel switching method for reducing channel zapping time required during the channel switching.

Accordingly, an object of the present invention is to provide an apparatus and method for channel switching for an MBS broadcast channel in a broadband wireless access system.

Another object of the present invention is to provide a channel switching apparatus and method for reducing channel zapping time required for channel switching in a broadband wireless access system.

Another object of the present invention is to provide an apparatus and method for switching a channel using only a DSC procedure without performing a separate DSA procedure when switching MBS channels in a broadband wireless access system.

Another object of the present invention, after completing the network entry procedure of the terminal in the broadband wireless access system, an apparatus for initializing the MBS service by performing the BS-init DSA procedure to add the provision service flow for the MBS of the terminal and In providing a method.

Another object of the present invention is the terminal in the broadband wireless access system to the MBS control message for the channel selection / change / termination through the initial provision service flow to the MBS controller, the base station controller is the channel through the MBS provision service flow An apparatus and method for performing BS-init DSC procedure for selection / change / end are provided.

According to an embodiment of the present invention to achieve the above object, a channel switching method for a multicast and broadcast service (hereinafter referred to as "MBS") broadcasting channel in a terminal of a broadband wireless access system, MBS When a channel selection / change / end command is selected, transmitting an MBS control message including the selected MBS channel selection / change / end command and corresponding channel information to a base station controller; and DSC-REQ (Dynamic) from the base station controller. Receiving a Service Change Request) message and transmitting a DSC-RSP message to the base station controller.

According to an embodiment of the present invention to achieve the above object, a channel switching method for a multicast and broadcast service (hereinafter referred to as "MBS") broadcasting channel in a base station controller of a broadband wireless access system, Receiving an MBS control message including an MBS channel selection / change / end command and corresponding channel information from the terminal; transmitting a DSC-REQ message to the terminal; Dynamic Service Change Response) message is received.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, a channel switching apparatus and method for a multicast and broadcast service broadcast channel in a broadband wireless access system according to the present invention will be described. In the following description, a base station may be configured as a radio access station (RAS) or a base station (BS), and the base station controller may be configured as an access control router (ACR) or an access service network gateway (ASN GW).

1 is a diagram illustrating a network structure for providing an MBS service of a broadband wireless access system according to the present invention. As shown, the network structure includes a contents server 150, an MBS controller 140, and a charging / authentication server (AAA) of a core network. 130), the base station controller 120, the base station 110, and the terminal 100 is configured.

Referring to FIG. 1, the content server 150 stores MBS content, and the AAA 130 is responsible for charging and authenticating the MBS service.

The MBS controller 140 manages and controls an MBS service, stores MBS content generated by a content provider in the content server 150, receives corresponding content from the content server 150, and receives a base station controller ( 120 and the base station 110 to transmit to the terminal 100. In addition, the MBS controller 140 enables the user to select a channel by transmitting MBS channel information to the terminal 100.

The base station controller 120 manages the connection and mobility of the terminal 100 and receives content from the MBS controller 140 to all base stations 110 included in a specific multicast group. Multicast the corresponding MBS traffic. In addition, the base station controller 120 generates an initial provision service flow during the network entry procedure of the terminal 100, and after completing the network entry procedure, adds a provision service flow for the MBS of the terminal 100. By performing BS-init DSA procedure, MBS service is initialized. In addition, when an MBS control message for channel selection / change / end is received from the terminal 100 through an initial provision service flow, the base station controller 120 selects / changes / channels through the MBS provision service flow. Perform BS-init DSC procedure to terminate.

The base station 110 interfaces with a wireless connection according to the IEEE 802.16 standard to provide a connection of a wireless section to the terminal 100, and transmits content from the base station controller 120 to the terminal 100. do. Finally, the terminal 100 supports the IEEE 802.16 standard and provides a MBS service to the user.

As shown, one MBS zone (MSB_ZONE) is composed of a plurality of base stations, base stations in the same MBS zone (MSB_ZONE) transmits the same broadcast content to the service terminal at the same time.

2 is a diagram illustrating a network entry and MBS service initialization process in a broadband wireless access system.

Referring to FIG. 2, when the terminal 200 initially accesses the base station 210, the terminal 200 periodically transmits a DCD, a downlink (hereinafter referred to as 'DL')-map (MAP), and an uplink. Scanning of the base station 210 to be accessed through the wireless link according to the link channel descriptor (hereinafter referred to as 'UCD') and the uplink (UP Link: referred to as 'UL')-map (MAP) message. After obtaining the DL channel synchronization and UL (uplink) channel synchronization parameters from the scanned base station 210 to synchronize the DL channel and the UL channel with the base station 210, the MAC address assigned in step 201 Sending a RNG-REQ (Ranging Request) message comprising a to the base station / base station controller 210. In this case, the base station / base station controller 210 transmits an RNG-RSP message to the connected terminal 200 in step 202.

In step 203, the terminal 200 sends an SBC-REQ (SS Basic Capability Request) message including physical layer parameter information and authentication policy information supported by the base station / base station controller. 210). In this case, the base station / base station controller 210 sends an SBC-RSP (SS Basic Capability Reponse) message including physical layer parameter information and authentication policy information included in the SBC-REQ message to the terminal 200 in step 204. send.

In step 205, the terminal 200 performs an authentication procedure with the AAA 230 and exchanges an authentication-related key.

In step 206, the terminal 200 transmits a registration request (REG-REQ) message including registration information such as service-related capability information to the base station / base station controller 210. In step 207, the base station / base station controller 210 transmits a REG-RSP (Registration Response) message including a subscriber profile to the terminal 200 to the terminal 200.

In step 208, the base station / base station controller 210 provides a service flow (Service Flow: SF) to the corresponding terminal 200 to set up a call for packet exchange, that is, add an initially provided UL and DL service flow. A DSA-REQ message including parameter information is transmitted. In this case, the terminal 200 transmits a DSA-RSP (Dynamic Service Addition Response) to the base station / base station controller 210 in step 209, and the base station / base station controller 210 successfully transmits the DSA-RSP message. When received, in step 210 transmits a DSA-ACK (Dynamic Service Addition Acknowledge) message to the terminal 200. Thus, the network entry procedure of the terminal 200 is completed.

Thereafter, the base station / base station controller 210 performs the BS-init DSA procedure for the corresponding terminal according to the authority of the MBS channel of the user. In other words, the base station / base station controller 210 includes the provision DL service flow parameter information for the MBS to the terminal 200 in order to add the provision DL service flow for the MBS of the terminal 200 in step 211. The DSA-REQ message is transmitted to the terminal 200. In this case, the terminal 200 transmits a DSA-RSP (Dynamic Service Addition Response) message to the base station / base station controller 210 in step 212, and the base station / base station controller 210 successfully transmits the DSA-RSP message. When received in step 213, a DSA-ACK (Dynamic Service Addition Acknowledge) message is transmitted to the terminal 200. The provision DL service flow for the MBS service of the terminal 200 is generated through the BS-init DSA procedure.

In step 214, the terminal 200 receives channel information on MBS content from the MBS controller 240 to complete the MBS service initialization procedure.

3 is a flowchart illustrating a separate service flow generation procedure for an MBS service in a terminal of a broadband wireless access system.

Referring to FIG. 3, the terminal completes a network entry procedure in step 301, and in step 303, a DSA-REQ message for adding a provision DL service flow for MBS service of the terminal from a base station controller. Checks whether is received. When the DSA-REQ message is received, the UE transmits a DSA-RSP (Dynamic Service Addition Response) message to the base station controller in step 305, and then receives a DSA-ACK (Dynamic Service) from the base station controller. Receive Service Addition Acknowledge) message. In step 307, the terminal receives channel information on MBS content from the MBS controller, and then terminates the algorithm according to the present invention. As a result, a provision DL service flow for the MBS service of the terminal is generated.

4 is a flowchart illustrating a separate service flow generation procedure for MBS service in a base station controller of a broadband wireless access system.

Referring to FIG. 4, the base station controller completes the network entry procedure of the terminal in step 401, and then in step 403, a DSA-REQ (Dynamic Service) for adding a provision DL service flow for MBS service of the terminal to the terminal. Addition Request) message is sent. In step 405, the base station controller determines whether a DSA-RSP (Dynamic Service Addition Response) message is received from the terminal, and when a DSA-RSP (Dynamic Service Addition Response) message is received from the terminal, step 407. After proceeding to transmit a DSA-ACK (Dynamic Service Addition Acknowledge) message to the terminal, the algorithm according to the invention ends. As a result, a provision DL service flow for the MBS service of the terminal is generated.

FIG. 5 is a diagram illustrating a process of selecting / changing an MBS channel and terminating a service in a broadband wireless access system.

Referring to FIG. 5, first, a DSC process for MBS channel selection is as follows. The user selects the desired MBS channel through the MBS application. In this case, the user's terminal 500 transmits an MBS control message to the base station / base station controller 510 in step 501. In this case, the MBS control message includes a channel selection command and information on the selected channel. Here, the MBS control message is a message serving as a triggering event (triggering event) for the BS-init DSC, and is transmitted through an initial provided service flow capable of transmitting a control signal generated at the network entry. In this case, the base station / base station controller 510 parses the destination IP address and port number information of the MBS control message in step 502 to recognize that the message is a message for selecting a specific MBS channel. In order to perform the BS-init DSC procedure. In other words, the base station / base station controller 510 transmits a DSC-REQ (Dynamic Service Change Request) message to the terminal 500 in step 503. In this case, the terminal 500 recognizes that the channel selection has been successfully performed, and transmits a DSC-RSP (Dynamic Service Change Response) message to the base station / base station controller 510 in step 504, and the base station in step 505. Receive a DSC-ACK (Dynamic Service Change Acknowledge) message from the base station controller 510. By the BS-init DSC procedure, the provision service flow for the MBS generated after the network entry process in FIG. 2 is converted to an active service flow.

Next, the DSC process for changing the MBS channel is as follows. The user changes the MBS channel through the MBS application. In this case, the user's terminal 500 transmits an MBS control message to the base station / base station controller 510 in step 506. In this case, the MBS control message includes a channel change command and information about a channel to change. In this case, the base station / base station controller 510 parses the destination IP address and port number information of the MBS control message in step 507 to recognize that the message is a message for changing a specific MBS channel. In order to perform the BS-init DSC procedure. In other words, the base station / base station controller 510 transmits a DSC-REQ (Dynamic Service Change Request) message to the terminal 500 in step 508. In this case, the terminal 500 recognizes that the channel change was successfully performed, and transmits a DSC-RSP (Dynamic Service Change Response) message to the base station / base station controller 510 in step 509, and the base station in step 510. Receive a DSC-ACK (Dynamic Service Change Acknowledge) message from the base station controller 510.

Finally, the DSC process for MBS service termination is as follows. The user terminates the desired MBS channel through the MBS application. In this case, the user's terminal 500 transmits an MBS control message to the base station / base station controller 510 in step 511. In this case, the MBS control message includes a channel termination command and information on the channel to terminate. In this case, the base station / base station controller 510 parses the destination IP address and port number information of the MBS control message in step 512 to recognize that the message is for terminating a specific MBS channel. In order to perform the BS-init DSC procedure. In other words, the base station / base station controller 510 transmits a DSC-REQ (Dynamic Service Change Request) message to the terminal 500 in step 513. In this case, the terminal 500 recognizes that the channel termination is successfully performed, and transmits a DSC-RSP (Dynamic Service Change Response) message to the base station / base station controller 510 in step 514, and the base station in step 515. / Receives a Dynamic Service Change Acknowledge (DSC-ACK) message from the base station controller 510. By this BS-init DSC procedure, the active service flow, which is currently in an active state, is changed to the provided service flow for MBS.

6 is a flowchart illustrating a procedure of selecting / changing an MBS channel and terminating a service in a terminal of a broadband wireless access system.

Referring to FIG. 6, in step 601, the terminal determines whether an MBS channel selection / change / end command is selected according to a user's key manipulation. When the MBS channel selection / change / end command is selected, the terminal transmits an MBS control message including the selected MBS channel selection / change / end command and corresponding channel information to the base station controller in step 603. Here, the MBS control message is a message serving as a triggering event (triggering event) for the BS-init DSC, and is transmitted through an initial provided service flow capable of transmitting a control signal generated at the network entry.

In step 605, the terminal checks whether a DSC-REQ message is received from the base station controller. When the DSC-REQ message is received, the UE recognizes that the channel selection / change / end is successfully performed, and proceeds to step 607 and proceeds with the DSC-RSP (Dynamic Service Change) to the base station controller. Response), and after receiving a DSC-ACK (Dynamic Service Change Acknowledge) message from the base station controller, the algorithm according to the present invention is terminated.

7 is a flowchart illustrating a procedure of selecting / changing an MBS channel and terminating a service in a base station controller of a broadband wireless access system.

Referring to FIG. 7, the base station controller determines whether an MBS control message including an MBS channel selection / change / end command and corresponding channel information is received from the terminal in step 701. Here, the MBS control message is a message serving as a triggering event (triggering event) for the BS-init DSC, and is received through an initial provided service flow capable of transmitting a control signal generated at the network entry.

When the MBS control message is received, the base station controller parses the destination IP address and port number information of the MBS control message to recognize that the message is a message for selecting a specific MBS channel, After transmitting a DSC-REQ (Dynamic Service Change Request) message to the UE in step 703, the process proceeds to step 705 to determine whether a DSC-RSP (Dynamic Service Change Response) message is received from the UE. When the DSC-RSP message is received, the base station controller transmits a DSC-ACK message to the terminal in step 707 and terminates the algorithm according to the present invention.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, the present invention can reduce the channel zapping time required during channel switching by switching channels using only the DSC procedure without performing a separate DSA procedure when switching MBS channels in a broadband wireless access system. There is this.

Claims (4)

In the channel switching method for the multicast and broadcast service (hereinafter referred to as "MBS") broadcasting channel in the terminal of the broadband wireless access system, When an MBS channel selection / change / end command is selected, transmitting an MBS control message including the selected MBS channel selection / change / end command and corresponding channel information to a base station controller; Receiving a DSC-REQ message from the base station controller, and transmitting a DSC-RSP message to the base station controller. The method of claim 1, When the network entry procedure is completed, a DSA-REQ (Dynamic Service Addition Request) message for adding a provided downlink service flow for MBS service of the terminal is received from the base station controller, and the DSA-RSP ( Sending a Dynamic Service Addition Response) message, Receiving MBS channel information from the MBS controller. In the channel switching method for a multicast and broadcast service (hereinafter referred to as "MBS") broadcasting channel in a base station controller of a broadband wireless access system, Receiving a MBS channel selection / change / end command and an MBS control message including corresponding channel information from the terminal; And transmitting a DSC-REQ message to the terminal and receiving a DSC-RSP message from the terminal. The method of claim 3, wherein After completing the network entry procedure of the terminal, transmitting a DSA-REQ (Dynamic Service Addition Request) message for adding a provided downlink service flow for the MBS service of the terminal to the terminal; And receiving a DSA-RSP (Dynamic Service Addition Response) message from the terminal.

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