KR20090056062A

KR20090056062A - Apparatus and method for performing cell broadcast service in wireless telecommunication system

Info

Publication number: KR20090056062A
Application number: KR1020070123041A
Authority: KR
Inventors: 전형준
Original assignee: 포스데이타 주식회사
Priority date: 2007-11-29
Filing date: 2007-11-29
Publication date: 2009-06-03

Abstract

An apparatus and a method for performing a cell broadcast service in a wireless communication system are provided to transmit a CBS(Cell Broadcast Service) message by using a DCD(Downlink Channel Descriptor) message, thereby efficiently using wireless resources without wasting wireless resources when transmitting the CBS message. A CBS processing unit(310) produces a CBS message transmitted to a terminal inside a cell. An MAC(Media Access Control) management message processor(320) broadcasts a DCD MAC management message having the CBS message is broadcast to a terminal inside the cell. The DCD message includes an MAC management message type, a configuration change counter, and a vendor specific information TLV. The CBS message is included in the vendor specific information TLV.

Description

Apparatus and Method for performing Cell Broadcast Service in wireless telecommunication system

The present invention relates to an apparatus and method for cell broadcast service in a wireless communication system. More particularly, in a wireless communication system conforming to the IEEE 802.16e standard, a base station transmits the same message to terminals located in a predetermined cell. A cast service apparatus and method.

A wireless communication system based on IEEE 802.16e may be a wireless broadband system (Wibro), which is a domestic mobile Internet system. By using Orthogonal Frequency Division Multiple Access (Multiple Access) and TDD (Time Division Duplexing) as a redundant method, high-speed data transmission is possible even when a user is moving in a wireless environment.

Meanwhile, a cell broadcast service (hereinafter, referred to as 'CBS') refers to a service in which a base station transmits the same data to terminals located in a certain area (see FIG. 1). It can be provided at the same time in real time, and can be effectively used especially for disaster notification and local advertising.

However, there is no recommendation for cell broadcast service (CBS) in a wireless communication system conforming to the IEEE 802.16e standard. Therefore, in order to transmit a CBS message according to the current IEEE 802.16e standard, a connection must be created using a dynamic service flow for data transmission, and then transmitted to each terminal individually. do.

Referring to Figure 2, a brief description of the CBS message transmission method using the dynamic service flow as follows.

First, the base station transmits a DSA-REQ message including a transaction ID allocated by the base station to create a new service flow to the terminal (S110). Upon receiving the DSA-REQ message, the terminal transmits the DSA-RSP message to the base station in response thereto (S120). The DSA-RSP message includes a confirmation code corresponding to the transaction ID and the DSA-REQ. Then, the base station transmits the DSA-ACK message to the terminal in response to the DSA-RSP message (S130). If the service flow is successfully allowed, the base station transmits a CBS message to the terminal (S140). When the data transmission is completed, the base station transmits a DSD-REQ message to the terminal to delete the existing service flow (S150). Then, the terminal transmits the DSD-RSP message to the base station in response to the DSD-REQ message (S160), thereby ending the dynamic service flow.

However, the above-described method using the dynamic service flow is a connection-oriented data delivery scheme, which is suitable for robust data transmission, but the size of data to be transmitted is small or one, such as a CBS message. If the connection is lost after the packet data unit (PDU) transmission, radio resources are greatly wasted.

The present invention was devised to solve the above problems, and an object of the present invention is to provide a cell broadcast in a wireless communication system capable of efficiently transmitting CBS messages to multiple terminals in a cell while efficiently using radio resources. It is to provide a service apparatus and method.

Another object of the present invention is to provide a cell broadcast service apparatus and method for transmitting a CBS message using a downlink channel descriptor (DDC) message among MAC management messages defined in IEEE 802.16d / e.

For this purpose, a cell broadcast service apparatus in a wireless communication system according to the present invention, CBS processing unit for generating a CBS (Cell Broadcast Service) message to be transmitted to the terminal in the cell; And a MAC management message processor for broadcasting a MAC (Media Access Control) management message including the CBS message to a terminal in the cell.

In addition, a cell broadcast service method in a wireless communication system according to the present invention includes a) generating a CBS (Cell Broadcast Service) message to be transmitted to a terminal in a cell; b) generating a MAC (Media Access Control) management message including the CBS message; And c) broadcasting the MAC management message to a terminal in the cell.

Preferably, a downlink channel descriptor (DDC) message is used as the MAC management message. The DCD message includes a MAC management message type, a configuration change counter, and a vendor-specific information TLV, and the CBS message includes the vendor-specific information TLV. Included in

According to the present invention, there is an effect that can be used efficiently without wasting radio resources when transmitting a CBS message.

In addition, according to the present invention, the cell broadcast service can be efficiently performed without changing the IEEE 802.16d / e standard.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments. For reference, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted in the following description.

3 is a configuration diagram of a cell broadcast service apparatus in a wireless communication system according to the present invention, and FIG. 4 is a flowchart of a cell broadcast service method in a wireless communication system according to the present invention. For reference, in the following description, an apparatus and method for cell broadcast service according to the present invention will be described with reference to FIGS. 3 and 4.

Referring to FIG. 3, the cell broadcast service apparatus 300 according to the present invention includes a CBS (Cell Broadcast Service) processor 310 and a MAC (Media Access Control) management message processor 320. The cell broadcast service device may be implemented by one device constituting a base station or by the base station itself.

The CBS processing unit 310 generates a CBS (Cell Broadcast Service) message to be transmitted to the terminal in the cell (S410). The CBS message may be generated based on information transmitted from a central cell broadcast center (CBC) in the case of a plurality of base stations, and is provided by a corresponding base station manager in case of only a specific base station. Can be generated.

The MAC management message processor 320 processes a MAC management message such as DCD, UCD, DL-MAP, UL-MAP, or the like. For the cell broadcast service, the MAC management message processor 320 includes a broadcast broadcast connection identifier (CID) or a fragmentable broadcast CID in a header when generating a MAC management message.

Meanwhile, according to a preferred embodiment of the present invention, a DCD message is used as a MAC management message for transmitting a CBS message. In detail, the MAC management message processor 320 receives the CBS message from the CBS processor 310 and generates a DCD message including the CBS message (S420). When generating a DCD message, the MAC management message processor 320 updates a configuration change counter (CCC) of the DCD message. In operation S430, the DCD message is broadcast to a terminal in a cell.

Hereinafter, a DCD (Downlink Channel Descriptor) message used in the present invention will be described in detail with reference to FIG. 5.

The DCD message is a kind of MAC management message, which describes the characteristics of the downlink radio physical layer, and is transmitted in the form of a broadcast from the base station.

As shown in FIG. 5, the DCD message according to the present invention includes a mandatory region and a type, length and value (TLV) region. The mentor area includes a MAC management message type (MMT) and a configuration change counter (CCC), and the TLV area includes TLV encoded information (TLV encoded information). The TLV-encoded information includes TLV-encoded vendor specific information (hereinafter referred to as 'vendor specific information TLV'). The present invention transmits a CBS message using a vendor specific information TLV.

For reference, Table 1 below shows a DCD message format according to an embodiment of the present invention.

[Table 1] DCD message format

In addition, Table 2 below shows the format of the vendor specific information TLV according to an embodiment of the present invention. Referring to Table 2, the type of the vendor-specific information TLV is set to '143 (0x8F)', and the length is set to be variable according to the CBS message size. The actual value represents a vendor definition, and includes a vendor identifier and a CBS message. Here, the vendor ID is for identifying the manager of the CBS message or the subject of the vendor definition, thereby preventing the vendor from being confused with the vendor specification information TLV designated by another vendor.

[Table 2] Vendor specific information TLV format

Tables 3 and 4 below show a vendor ID transmission format (vendor ID encoding TLV) and a format for CBS message transmission according to an embodiment of the present invention, respectively.

[Table 3] Vendor ID Transfer Format

[Table 4] CBS message transmission format

For reference, when the vendor ID is '0xFFFFFF' and the CBS message size is 32 bytes, the vendor specification information TLV as shown in FIG. 6 may be formed.

Referring to Fig. 6, the vendor specific information TLV includes ① vendor specific information type, ② vendor specific information TLV size, ③ vendor ID type, ④ vendor ID size, ⑤ vendor ID, ⑥ CBS message type, ⑦ CBS message size ⑧ CBS message It can be seen that it contains information about.

Meanwhile, the CBS message may be transmitted through the broadcast connection instead of the designed connection as described above. In this case, a new message format for cell broadcast service can be defined, and Table 5 below illustrates this.

[Table 5] CBS message format

Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art to which the present invention pertains can implement the present invention in other specific forms without changing the technical spirit or essential features, The examples are to be understood in all respects as illustrative and not restrictive.

In addition, the scope of the present invention is specified by the appended claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention. Should be interpreted as

1 is a diagram illustrating an outline of a cell broadcast service.

2 is a diagram illustrating a method of transmitting a CBS message using a conventional dynamic service flow.

3 is a block diagram of a cell broadcast service apparatus according to the present invention.

4 is a flowchart of a cell broadcast service method according to the present invention.

5 is a diagram illustrating the structure of a DCD message according to the present invention.

6 is a diagram illustrating a vendor specific information TLV format according to the present invention.

Claims

CBS processing unit for generating a CBS (Cell Broadcast Service) message to be transmitted to the terminal in the cell; And

A MAC management message processor for broadcasting a Downlink Channel Descriptor (DCD) Media Access Control (MAC) management message including the CBS message to a terminal in the cell.

Cell broadcast service apparatus in a wireless communication system comprising a.

The method of claim 1,

The DCD message includes a MAC Management Message Type, a Configuration Change Count, and a Vendor-Specific Information TLV.

And the CBS message is included in the vendor specific information TLV.

The method of claim 2,

And the vendor specific information TLV includes a Vendor Identifier (ID) identifying a manager of the CBS message.

The method according to claim 2 or 3,

And the MAC management message processing unit updates the configuration change counter when transmitting the CBS message.

The method according to any one of claims 1 to 3,

And a header of the MAC management message includes a broadcast CID or a fragmentable broadcast CID.

The method according to any one of claims 1 to 3

The DCD message is a cell broadcast service apparatus in a wireless communication system, characterized in that for supporting IEEE 802.16d / e.

The method according to any one of claims 1 to 3

The cell broadcast device is a cell broadcast service device in a wireless communication system, characterized in that the base station.

a) generating a CBS (Cell Broadcast Service) message to be transmitted to a terminal in a cell;

b) generating a MAC (Media Access Control) management message including the CBS message; And

c) broadcasting the MAC management message to a terminal in the cell;

Cell broadcast service method in a wireless communication system comprising a.

The method of claim 8,

The MAC management message is a Downlink Channel Descriptor (DDC) message.

The method of claim 9,

The DCD message includes a MAC Management Message Type (MMT), a Configuration Change Count (CCC), and a Vendor-specific Information TLV (VLV).

The CBS message is included in the vendor specific information TLV cell broadcast service method in a wireless communication system.

The method of claim 10,

The step b) includes updating the configuration change counter of the DCD message.

The method of claim 10,

The vendor specific information TLV includes a Vendor ID (Vendor Identifier) for identifying the manager of the CBS message.

The method according to any one of claims 9 to 12,

The DCD message is a cell broadcast service method in a wireless communication system, characterized in that for supporting IEEE 802.16d / e.