KR20080053077A - Apparatus and method for sending broadcast information from base station to user equipment periodically by rs over mmr system - Google Patents

Abstract

A RS apparatus for transmitting broadcast information received from a BS(Base Station) to a UE periodically in an MMR(Multihop Mobile Relay) system, and a transmission method therefore are provided to schedule broadcast information so as for the broadcast information to be transmitted to terminals within the RS according to the time intervals of the broadcast information transmitted by an MMR-BS, thereby using radio resources between the MMR-BS and a RS efficiently. A RS(Relay Station) apparatus(200) comprises a receiving unit(201), a scheduling unit(202), and a transmitting unit(203). The receiving unit receives a message including broadcast information to be transmitted to a UE(User Equipment), and stores/updates the broadcast information in the received message. The scheduling unit determines broadcast information to be included into a downlink frame on the basis of predetermined time intervals for the each broadcast information in the stored or updated broadcast information. The transmitting unit transmits the determined broadcast information to the UE within the RS using the downlink frame.

Description

An apparatus and method for transmitting broadcast information received from the BS on a periodic basis in an MRM system and its transmission method {Apparatus and Method for sending broadcast information from Base Station to User Equipment periodically by RS over MMR System}

1 is a structural diagram of an MMR-BS and an RS system for transmitting broadcast information in an MMR communication system according to the present invention;

FIG. 2 is a diagram illustrating a configuration of an RS apparatus for transmitting broadcast information received from a BS to a terminal at regular intervals in an MMR system according to an embodiment of the present invention.

3 is a diagram of a downlink frame structure when only the broadcast information is transmitted by an RS apparatus according to an embodiment of the present invention.

4 is a diagram illustrating a downlink frame structure when DL data allocated to Burst # 0 exists in a downlink frame to be transmitted to a terminal according to an embodiment of the present invention.

5 is a diagram illustrating a call processing procedure for transmitting broadcast information in an MMR system according to an embodiment of the present invention.

6 is a diagram showing a DB structure for storing each broadcast information in an RS apparatus according to an embodiment of the present invention.

7 is a flowchart illustrating a method of transmitting broadcast information received from a BS to a terminal at regular intervals in an MMR system according to an embodiment of the present invention.

8 is a flowchart illustrating in detail a method of transmitting the received broadcast information of FIG. 7 to a terminal at regular intervals according to an exemplary embodiment of the present invention.

The present invention relates to an RS (Relay) apparatus for transmitting broadcast information received from a BS to a terminal in a predetermined period in a multihop mobile relay (MMR) system, and a method for transmitting the same. An apparatus and a method for transmitting broadcast information periodically to a terminal in a cell in an RS (Relay system) through an initialization process.

The present invention relates to a method of simply transmitting broadcast information periodically from an RS on an MMR communication system. A method of periodically transmitting broadcast information to a terminal through an initial setting process of an MMR-BS to an RS and a recording of a program in which the method is recorded It shall contain a medium.

In the WiBro communication system, all the base stations periodically transmit broadcast information to the terminal in order to obtain various information about the base station to which the base station belongs.

That is, the base station processes the broadcast information stored at cell initialization according to a certain period and time offset and transmits the broadcast information to the terminal within the cell.

The WiBro MMR communication system installs and uses an RS (Relay Station) to provide high quality service to terminals located in a shadow area or a cell boundary or an outer area existing in a base station cell. However, the conventional RS has a limitation in processing a variety of broadcast information in the role of simply transmitting the information received from the BS as it is. Therefore, there is a problem in that the configuration for controlling the BS again in the management of additional costs, and it is difficult to consider the processing procedures according to the various environments to which the RS belongs.

Accordingly, a scheme for performing a function of scheduling broadcast information so that the RS transmits the broadcast information to terminals in the RS in accordance with the timing of the broadcast information transmitted by the MMR-BS may be considered. This is a method for allowing the RS to manage broadcast information independently of the MMR-BS.

In order to solve the above problems, the present invention proposes an RS apparatus for transmitting broadcast information received from a BS to a mobile station at regular intervals, and a method of transmitting the same. By transmitting the broadcast information, the MMR-BS eliminates the need for any additional processing other than the broadcast information transmission through the cell initialization process of the RS, and enables radio resources to be efficiently used between the MMR-BS and the RS on the MMR system. I would like to.

According to a preferred embodiment of the present invention for achieving the above technical problem, an RS apparatus for transmitting broadcast information received from a BS to a terminal at regular intervals in a multihop mobile relay (MMR) system includes a message including broadcast information to be transmitted to the terminal. A receiver for storing or updating broadcast information in the received message received from a BS (base station) and a broadcast to be included in a downlink frame to be currently transmitted based on a predetermined time period for each broadcast information among the stored or updated broadcast information. A scheduling unit for determining information and a transmission unit for transmitting the determined broadcast information to the terminal in the relay station (RS) using the downlink frame.

In a preferred embodiment of the present invention for achieving the above technical problem, a method of transmitting periodic broadcast information to a terminal using RS in an MMR system includes receiving a message from a base station (BS) including broadcast information to be transmitted to the terminal. Storing or updating broadcast information in a received message, determining broadcast information to be included in a downlink frame to be currently transmitted based on a time period of each broadcast information among the stored or updated broadcast information, and determining the determined broadcast information Is transmitted to the terminal in the RS using the downlink frame.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a structural diagram of an MMR-BS and an RS system for transmitting broadcast information in an MMR communication system according to the present invention.

This is a system conceptual diagram of a base station and RS for transmitting broadcast information in a WiBro MMR communication system. The packet scheduler of the MMR-BS periodically plays information on a downlink channel descriptor (DDC) and an uplink channel descriptor (UCD) when the base station is initialized. Then, when the terminals in the cell enter the cell area, information about the cell is obtained using DCD and UCD information that is periodically transmitted.

However, if a terminal exists in a shadow area or cell boundary within a cell, it is necessary to retransmit broadcast information through a relay station (RS) to ensure reception of broadcast information. Therefore, the RS is located in the middle of the MMR-BS and the UE to transmit the information to be transmitted by the MMR-BS to the UE. The present invention intends to propose a configuration in which the RS can transmit itself received broadcast information to a terminal in a cell at regular intervals according to each broadcast information.

2 is a diagram illustrating a configuration of an RS apparatus for transmitting broadcast information received from a BS to a terminal at regular intervals in an MMR system according to an embodiment of the present invention.

Referring to FIG. 2, the RS device 200 receives a message including broadcast information to be transmitted to a terminal from a base station (BS) and stores or updates broadcast information in the received message. A scheduling unit 202 for determining broadcast information to be included on a downlink frame to be currently transmitted based on a predetermined time period for each broadcast information among the stored or updated broadcast information, and the determined broadcast information by using the downlink frame RS ( Relay Station) is configured to include a transmission unit 203 for transmitting to the terminal. In this case, the received message is an information setup message of an RS system, and the broadcast information includes DCD (Downlink Channel Descriptor) information and / or UCD (Uplink Channel Descriptor) information.

The receiver 201 operates a DB (DataBase) for each broadcast information, and when the broadcast information in the received message exists in the DB, the DB is updated with the broadcast information, and the broadcast information in the received message is updated. When the new broadcast information is stored in the DB the broadcast information newly.

In addition, the message received by the receiver 201 includes a time period to be transmitted from the RS of the broadcast information to the terminal, and the time period is stored in the DB for each broadcast information together with the broadcast information. In step 202, the broadcast information to be included on the downlink frame to be transmitted currently is determined for each broadcast information based on the time period.

The determination of the broadcast information to be included on the downlink frame to be transmitted currently is performed by dividing the frame number on the BS (BFN) by subtracting the offset for the broadcast information by the time period for the broadcast information. The broadcast information in this case is the target.

Lastly, when downlink traffic exists in the burst to which the broadcast information is to be transmitted, the transmitter 203 transmits the downlink traffic and the broadcast information as one burst to the terminal. The downlink traffic is a response message for the ranging of the terminal from the BS, and the one burst is assumed to be the first burst (burst # 0) on the downlink frame. Hereinafter, the configuration will be described in detail.

3 is a diagram of a downlink frame structure in the case of transmitting only broadcast information in an RS apparatus according to an embodiment of the present invention.

This shows a downlink frame structure in which a DL (DownLink) frame includes a preamble, a DL / UL MAP, and a burst transmitted from broadcast information and an RS to a UE exists in the current frame.

Referring to FIG. 3, only broadcast information exists in Burst # 0, which is currently the first burst, and this burst becomes an area in which the MMR-BS area and the RS area simultaneously transmit broadcast information. The RS puts the broadcast information in the burst and transmits it to the terminal in the cell. In relation to this, it is assumed that a section for transmitting data from the MMR-BS to the UE, a data section from the RS to the UE, and a data section from the BS to the RS are behind the DL region.

4 is a diagram illustrating a downlink frame structure when DL data allocated to Burst # 0 exists in a downlink frame to be transmitted to a terminal according to an embodiment of the present invention.

This shows a downlink frame structure in the case where there is broadcast information in the current frame and there is a ranging response message to be sent to all terminals in the cell area.

Referring to FIG. 4, broadcast information and response messages are allocated to burst # 0 (broadcast burst). As a result, the RS simultaneously processes information to be broadcast and data of burst # 0 to be transmitted to the current frame from the upper MMR-BS. Must be transmitted in one burst.

5 is a diagram illustrating a call processing procedure for transmitting broadcast information in an MMR system according to an embodiment of the present invention.

Referring to FIG. 5, the MMR-BS first transmits an RS system information setup message to the RS (501). After storing the parameters on the corresponding message in a separate DB (the DB will be described with reference to FIG. 6 below), the RS transmits the broadcast information into the RS every N broadcast periods (502). If the ranging code does not exist, the broadcast information is limited to information including DCD / UCD (503).

If the UE in the RS transmits a ranging code (504) and the code transmitted to the MMR-BS through the RS is successfully received (505), the MMR-BS sends a ranging code response message to the UE through the RS in the next frame. And transmit (506). At this time, if the broadcasting information is combined with the outgoing cycle, the scheduler of the MMR-BS should allocate an RS-> UE section having a burst # 0 size other than the broadcasting information to the RS. The RS bursts the broadcasting information and the ranging response. The # 0 data is combined and broadcasted to the terminals in the RS (507) so that the terminals receive the bust # 0 data (508).

In order to transmit the broadcasting information of MMR-BS periodically in the RS zone, it receives control information from the MMR-BS, stores it in the broadcasting information data storage space of the RS, and then periodically generates and broadcasts the broadcasting information of the MMR-BS. It is to store and manage, and to operate DB for each broadcasting information, and to schedule broadcasting information transmission by itself according to transmission period. In order to eliminate the waste of radio resources between the MMR-BS and the RS, a structure for scheduling broadcast information in the RS should be provided.

6 is a diagram illustrating a DB structure for storing each broadcast information in an RS apparatus according to an embodiment of the present invention.

This simply shows a DB structure for storing each broadcast information in the RS according to the present invention, and shows a DB for DCD and UCD related parameters transmitted when the RS cell is set up from the MMR-BS according to the present invention. Using ON_Flag for each broadcasting information, the RS stores broadcasting data (data DB) and time period (period) in the DB. In addition, a correction value or an offset value for calculating a time period for each broadcast information is also stored in the DB.

The use of each of these parameters will be described in detail in the configuration of FIG. 8.

FIG. 7 is a flowchart illustrating a method of transmitting broadcast information received from a BS to a terminal at regular intervals in an MMR system according to an exemplary embodiment of the present invention.

Referring to FIG. 7, when a message including broadcast information to be transmitted to a terminal is received from a base station (BS) (701) and the broadcast information in the received message is stored or updated (702), the stored or updated broadcast is received. The broadcast information to be included in the downlink frame to be currently transmitted is determined based on the time period of each broadcast information among the information (703), and the determined broadcast information is transmitted to the terminal in RS using the downlink frame (704). ). Here, the broadcast information includes downlink channel descriptor (DDC) information and uplink channel descriptor (UCD) information.

8 is a flowchart illustrating in detail a method of transmitting the received broadcast information of FIG. 7 to a terminal at regular intervals according to an exemplary embodiment of the present invention.

This is a flowchart for transmitting broadcast information in the RS according to the present invention. Referring to FIG. 8, first, the RS initializes the broadcast information DB (801). If there is a broadcast information setting message (802), it is checked whether DCD / UCD On_Flag is 1 (803).

If the On_Flag value is 0, since the broadcast information setting of the current base station is the first, the On_Flag is set to 1 and the DCD / UCD parameter is stored in the DB (804). If On_Flag is 1, since it is an update command for existing broadcast information, the value in the corresponding DB is updated with a new value (805).

The RS checks whether the DCD / UCD On_flag and the NBR-ADV On_flag are 1 for each frame (806). If both On_flag is 0, the task at the current frame is terminated. If DCD On_flag is 1 (806), it is calculated whether (BFN-offsetD)% DCD_Periodicity becomes 0 using the offsetD value and DCD_periodicity given to determine whether to broadcast the DCD in the current frame (807). In this case, the BFN (BS Frame Number) means an increasing number for each frame in the BS (it may have a value between 0 and 4095).

If it is not 0, it is not the current frame transmission time and the process goes to the UCD checking routine (811). If 0, it is checked whether DL traffic exists in burst # 0 (808). If it does not exist, burst # 0 is generated using DCD data stored in DB (810). If burst # 0 is generated when there is DL traffic to be transmitted, DLD data is added after adding DCD data before the given DL Traffic data. Concatenate to generate burst # 0 data (809).

After the DCD processing is completed, broadcast information is generated using the same routine as the DCD using the period, offset value, and broadcast data of the DB values stored for the UCD.

That is, to determine whether to broadcast UCD in the current frame, calculate whether (BFN-offsetD)% UCD_Periodicity becomes 0 using the given offsetD value and UCD_periodicity (811). Check if there exists (812), if it does not exist, generate burst # 0 using DCD data stored in DB (814). If burst # 0 is generated when DL traffic exists, After the DCD data is added, DL Traffic data is concatenated to generate burst # 0 data (813).

The invention can also be embodied as computer readable code on a computer readable recording medium. Computer-readable recording media include all kinds of recording devices that store data that can be read by a computer system. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disks, optical data storage devices, and the like, which are also implemented in the form of carrier waves (for example, transmission over the Internet). Include. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion. In addition, functional programs, codes, and code segments for implementing the present invention can be easily inferred by programmers in the art to which the present invention belongs.

Such a method and apparatus of the present invention have been described with reference to the embodiments shown in the drawings for clarity, but these are merely exemplary, and various modifications and equivalent other embodiments are possible to those skilled in the art. Will understand. Therefore, the true technical protection scope of the present invention will be defined by the appended claims.

As described above, the present invention is a method of periodically transmitting broadcast information in an RS of an MMR communication system, and according to a method of periodically transmitting broadcast information by an RS after a cell initialization process of the present invention MMR-BS, The MMR-BS provides high quality service to the UEs in the shadow area, and specifically schedules the broadcast information to deliver the broadcast information to the UEs in the RS according to the time period of the broadcast information transmitted by the MMR-BS. The radio resources between the RS and the RS can be efficiently used.

Claims (17)

A receiver which receives a message including broadcast information to be transmitted to a terminal from a base station (BS) and stores or updates broadcast information in the received message; And A scheduling unit for determining broadcast information to be included on a downlink frame to be currently transmitted based on a predetermined time period for each broadcast information in the stored or updated broadcast information; And And a transmission unit for transmitting the determined broadcast information to a terminal in a relay station (RS) using the downlink frame. The broadcast information received from the BS in a multihop mobile relay (MMR) system to a terminal at regular intervals. RS device transmitting. The method of claim 1, And the message received by the receiver is an information setup message of an RS system. The method of claim 1, The broadcast information RS device for transmitting the broadcast information received from the BS to the terminal in a certain period in the MMR system, characterized in that it comprises downlink channel descriptor (DCD) information and / or uplink channel descriptor (UCD) information. The method of claim 1, The reception unit operates a DB (DataBase) for each broadcast information and updates the DB with the broadcast information when the broadcast information in the received message exists in the DB. RS device for transmitting the broadcast information received from the BS to the terminal in a certain period in the MMR system, characterized in that the new information is stored in the DB when the broadcast information in the received message is new broadcast information. The method of claim 4, wherein The message received by the receiver includes a time period to be transmitted from the RS of the broadcast information to the terminal, the time period is stored in the DB for each broadcast information together with the broadcast information, The RS for transmitting the broadcast information received from the BS to the terminal at regular intervals in the MMR system, characterized in that the scheduling unit determines the broadcast information to be included on the downlink frame to be currently transmitted for each broadcast information based on the time period. . The method of claim 5, wherein the scheduling unit For each broadcast information, when a value obtained by subtracting a period offset value for broadcast information from a frame number (BFN) on a BS is divided into time periods for the broadcast information, the broadcast information to be included in the downlink frame to be currently transmitted. RS device for transmitting the broadcast information received from the BS to the terminal at regular intervals in the MMR system characterized in that determined by the information. The method of claim 1, When the downlink traffic exists in the burst to which the broadcast information is transmitted on the downlink frame, the transmitter transmits the downlink traffic and the broadcast information as one burst to the terminal in the MMR system. RS device for transmitting the broadcast information to the terminal at regular intervals. The method of claim 7, wherein In the MMR system, the downlink traffic in the downlink frame is a response message for the ranging of the terminal from the BS, and the one burst is the first burst (burst # 0) on the downlink frame. RS device for transmitting the broadcast information received from the BS to the terminal at regular intervals. (a) receiving a message including broadcast information to be transmitted to a terminal from a base station (BS) and storing or updating broadcast information in the received message; (b) determining broadcast information to be included on a downlink frame to be currently transmitted based on a time period of each broadcast information in the stored or updated broadcast information; And and (c) transmitting the determined broadcast information to a terminal in RS using the downlink frame. The method of claim 9, In the step (a), the received message is an information setup (setup) message of the RS system, characterized in that the periodic broadcast information transmission method to the terminal using the RS in the MMR system. The method of claim 9, The broadcasting information includes downlink channel descriptor (DDC) information and / or uplink channel descriptor (UCD) information. The method of claim 9, The step (a) is to operate the DB (DataBase) for each broadcast information, if the broadcast information in the received message exists in the DB to update the DB with the broadcast information, If the broadcast information in the received message is new broadcast information, the broadcast information is periodically stored in a DB. The method of claim 12, In the step (a), the received message includes a time period to be transmitted from the RS of the broadcast information to the terminal, and the time period is stored in the DB for each broadcast information together with the broadcast information. The step (b) is a method for transmitting periodic broadcast information to a terminal using RS in an MMR system, characterized in that for determining the broadcast information to be included on the downlink frame to be currently transmitted for each broadcast information based on the stored time period. The method of claim 13, wherein in step (b) For each broadcast information, if the value obtained by subtracting the period ㅂ offset value for the broadcast information from the frame number (BFN) on the BS is divided by the time period for the broadcast information, the broadcast information is included in the downlink frame to be currently transmitted. Method for transmitting periodic broadcast information to a terminal using RS in an MMR system, characterized in that determined by the broadcast information. The method of claim 9, In the step (c), if downlink traffic exists in the burst to which the broadcast information is transmitted on the downlink frame, the downlink traffic and the broadcast information as one burst MMR system characterized in that for transmitting to the terminal Method for transmitting periodic broadcast information to a terminal using RS in. The method of claim 9, In the step (c), the downlink traffic in the downlink frame is a response message for the ranging of the UE from the BS, and the one burst is the first burst (burst # 0) on the downlink frame. Method for transmitting periodic broadcast information to a terminal using RS in. The method according to any one of claims 9 to 16, A computer-readable recording medium recorded in a program for executing a periodic broadcast information transmission method from the MMR system to a terminal using RS in a computer.

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