KR100855004B1 - Communication method using frame structure for transparent relay station in MRM system - Google Patents

Abstract

A communication method using a frame structure for a transparent relay station in an MMR system according to the present invention is a communication method in an MMR system including a base station, a mobile terminal, and a relay station connecting the base station and the mobile terminal, the preamble from the base station. Receiving a first frame containing first channel control information including an FCH and a MAP; Constructing a second frame for including the second channel control information and data generated based on the first channel control information and transmitting the data to a lower node; And transmitting the second frame to a lower node. The cell frame may be increased by simultaneously transmitting a preamble such as MR-BS, an FCH, and a MAP, and a diversity effect may be obtained. .

Description

Method for communicating in MMR system using frame structure for transparent relay station}

1 is a diagram briefly showing a configuration of a network to which a communication method according to the present invention is applied.

2A is a diagram showing a conventional frame structure transmitted by a base station to a transparent relay station.

2B is a diagram illustrating a conventional frame structure transmitted by a transparent relay station to a mobile terminal.

3A is a diagram illustrating a frame structure according to the present invention transmitted by a base station to a transparent relay station.

3B is a diagram showing a frame structure according to the present invention transmitted by a transparent relay station to a mobile terminal.

4 is a flowchart showing a process of a communication method according to the present invention.

The present invention relates to a frame structure for efficient operation of a transparent relay station, and a communication method using the frame structure in an MMR (Mobile Multi-hop Relay) system.

The MMR system conforms to the IEEE 802.16 (e) standard, and provides a multi-hop communication path through digital relay to a mobile terminal, which can expand the service area faster and at a lower cost than the existing system, and also increases the system capacity. It is a system that has the advantage of increasing.

1 illustrates an example of operating an MMR system in a cell. In the area covered by the MR-BS (Base Station) 110, the transparent relay station RS1 is connected to the mobile terminal 1 MS1 (120), and the non-transparent relay station (RS2) It is connected to the mobile terminal 2 (MS2) 130 is showing a state in operation. The current standardization conference addresses these two relay station operations: transparent relay station and non-transparent relay station. In a transparent relay station operation, an MS connected to a relay station is located in a coverage of an MR-BS (Base Station). The downlink control signal of the MR-BS is directly transmitted to a mobile station (hereinafter referred to as “MS”) having the frame configuration of FIG. 2A, where the downlink subframe is divided into two areas, and the first area is The control signal including the preamble 211 and the data transmitted from the MR-BS to the MS or relay station (hereinafter referred to as "RS") is loaded, and the second area 220 is the data transmitted from the relay station to the mobile terminal. The same data may be carried, or may be blank, and as can be seen in Figure 2b, the first region 230 of the downlink subframe of the relay station shows MR, except for control data for sync 231. It can be seen that the BS only receives control data 233 and does not transmit the preamble and MAP (configuration information for the current frame) All MSs and RSs located in one cell are transmitted from the MR-BS.Is synchronized with the re-amble, and receives the up / down link map. Transparent RS is used for the purpose of throughput improvement, MS is located within the cell coverage for the preamble and the MAP received the MR-BS.

On the other hand, in the non-transparent relay station operation, the RS transmits a preamble and a MAP at the beginning of a downlink subframe. Therefore, the MS recognizes the RS as one BS, and scheduling through the MR-BS and scheduling through the RS are possible. As shown in FIG. 1, the transparent RS and the non-transparent RS may coexist in one cell.

The existing frame structure for a transparent relay station as shown in FIG. 2B is used for the purpose of improving throughput, but MSs located outside the cell or in the shadow area within the cell are not supported.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a frame structure and a communication method using the frame structure to be generated by the transparent relay station and transmitted to the lower node.

A communication method using a frame structure for a transparent relay station in an MMR system according to the present invention is a communication method in an MMR system including a base station, a mobile terminal, and a relay station connecting the base station and the mobile terminal, the preamble from the base station. Receiving a first frame containing first channel control information including an FCH and a MAP; Constructing a second frame for including the second channel control information and data generated based on the first channel control information and transmitting the data to a lower node; And transmitting the second frame to a lower node. The method includes a communication method using a frame structure for a transparent relay station in an MMR system.

In another embodiment of the communication method using a frame structure for a transparent relay station in an MMR system according to the present invention, the second frame includes a first area including the second channel control information; A second area allocated for the data transmitted to a mobile terminal or a lower relay station connected to the relay station; a downlink subframe including and a uplink subframe including a burst transferred from the mobile terminal or the relay station to the base station; It is preferable to include.

In another embodiment of a communication method using a frame structure for a transparent relay station in an MMR system according to the present invention, the second channel information is preferably the same as the first channel information.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. To the extent that the core of the present invention is clear, the contents which can be understood by those skilled in the art will be omitted. FIG. 3A is a diagram illustrating a frame structure according to the present invention transmitted by a base station to a transparent relay station, and FIG. 3B is a diagram illustrating a frame structure according to the present invention transmitted by a transparent relay station to a mobile terminal. 4 is a flowchart showing a process of a communication method according to the present invention.

First, the terms are defined.

BS: Base Station Base Station.

-MS: Mobile Station mobile terminal.

RS: Relay Station Relay Station.

Downlink: An area in which data is transmitted from a BS to another terminal.

Uplink: An area in which data is transmitted from another terminal to a BS.

MAP: Information about the composition of the current frame.

The frame structure according to the present invention is as shown in Figs. 3a and 3b. Frames for a transparent relay station are divided into a downlink subframe and an uplink subframe. The "MR-BS Frame" (FIG. 3A), which is a frame structure of the base station, is the same as the frame structure for a conventional transparent relay station. That is, the downlink subframe of the MR-BS frame (referred to as “first frame” in the claims) is divided into two regions. The first area 310 includes a preamble 311, an FCH 312, a DL-MAP 313, an UL-MAP 315, an optional R-MAP 316, and an area in which data is filled. The second area 320 is an area capable of selectively transmitting data. In the present invention, a diversity effect can be obtained by equalizing the data carried in this part and the data carried in the optional transparent zone 340 of FIG. 3B. Can be. To this end, information must be exchanged between the BS and the transparent relay station or operated as previously set. The preamble 311 is used for synchronization acquisition, channel estimation, and the like, and the FCH 312 includes information for frame control. The DL-MAP 313 includes downlink subframes, and the UL-MAP 314 and 315 include information for data allocation in the uplink subframe. The optional R-MAP 316 also includes data allocation information for the relay station.

The downlink subframe of RS Frame (referred to as “second frame” in the claims) is divided into “MR-BS → MS / RS” region 330 and “Optional Transparent Zone” region 340. “MR-BS → MS / RS” area 330 is an area for transmitting data from MR-BS to MS and RS (referred to as “first area” in the claims), and “Optional Transparent Zone 340”. ) &Quot; is the area for the transparent relay station to transmit data to the MS or subordinate RS (referred to as “second area” in the claims). Again, the “MR-BS → MS / RS” region 330 is a preamble 331, an FCH 332, a DL-MAP 333, an UL-MAP 334, 335, an optional R-MAP 336 and data. It is divided into areas. In the prior art, the transparent relay station receives only the preamble and control information FCH, DL-MAP, UL-MAP, optional R-MAP, etc., but the present invention also includes transmission of the preamble and control information. Here, the preamble, FCH, DL-MAP, UL-MAP, and optional R-MAP are the same as those transmitted from the MR-BS, and thus description thereof is omitted.

Now, a communication method using the frames of FIGS. 3A to 3B will be described. 4 is a flowchart illustrating a process of a communication method using a frame for a transparent relay station according to the present invention. First, the first frame as shown in FIG. 3a is received from the base station (S410). To this end, the MR-BS is connected to the MS and RS connected to the MR-BS through the “MR-BS → MS / RS” region 310 in the downlink subframe of the first frame, that is, the MR-BS frame (FIG. Send control information and data. In the downlink subframe, a region 320 other than "MR-BS → MS / RS" may be selectively transmitted, and diversity effects may be obtained by simultaneously transmitting data through the region in the MR-BS and the RS.

The transparent relay station acquires synchronization using the preamble 311 of the MR-BS at the time of entering the network, that is, at the point of starting the function as the relay station (step S420). The MAP information transmitted from the MR-BS is used to demodulate data transmitted from the MR-BS to the RS (step S430). The demodulated data is carried in the "Optional Transparent Zone 340" through scheduling, and the preamble and the MAP are also loaded in the "MR-BS-> MS / RS region 330" of the downlink subframe (S440). Step 2) Here, by using the second region of the downlink subframe in the frame structure of the MR-BS, that is, the second region 320 of the downlink subframe of the MR-BS frame and the "Optional Transparent Zone 340 of the RS". Diversity effect can be obtained by transmitting the same data or space-time encoded data through ". Here, space-time encoding is the same as Space Time Block Code (STBC) proposed in the IEEE 802.16 (e) standard. The base station and the relay station determine the encoding scheme through a message, etc. The second frame thus configured is transmitted to the MS or lower RS, and the preamble and MAP transmitted in the second frame are different from those transmitted from the MR-BS. The.

Take a look at Microsoft's perspective. In case of MS, it can be connected directly to MR-BS or by using RS. Upon entering the network, the MS acquires synchronization using the preamble transmitted from MR-BS or RS. The MS directly connected to the MR-BS receives control information and data through the “MR-BS → MS / RS” region in the downlink subframe of the “MR-BS Frame”. The MS connected to the RS receives data transmitted through the "Optional Transparent Zone" of the downlink subframe of the RS.

The functions used in the communication method using the frame structure for the transparent relay station in the MMR system according to the present invention disclosed herein can be implemented as computer readable codes 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 may also be implemented in the form of carrier waves (for example, transmission over the Internet). do. 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. And 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.

As described above, optimal embodiments have been disclosed in the drawings and the specification. Although specific terms have been used herein, they are used only for the purpose of describing the present invention and are not intended to limit the scope of the present invention as defined in the claims or the claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

As described above, the communication method using the frame structure for the transparent relay station in the MMR system according to the present invention has the following advantages over the communication method using the conventional frame.

First, cell coverage may be increased by transmitting a preamble, an FCH, and a MAP at the same time, such as an MR-BS.

       Second, diversity effects can be obtained by simultaneously transmitting preambles such as MR-BS, FCH, and MAP.

       Third, the MS receives not only data but also a preamble, so that the relative magnitudes of the power of the data region and the preamble are similar to those of the transmitter, and there is an advantage in channel estimation using the preamble.

Fourth, by using the second region of the downlink subframe in the frame structure of the MR-BS, that is, the same data or space-time through the second region of the downlink subframe of the MR-BS frame and the "Optional Transparent Zone" of the RS The diversity effect can be obtained by transmitting the encoded data. Here, space-time encoding is the same as Space Time Block Code (STBC) proposed in the IEEE 802.16 (e) standard. For this purpose, the base station and the relay station determine the encoding scheme through a message.

Claims (5)

In the communication method of the transparent relay station in an MMR system consisting of a base station, a mobile terminal, a transparent relay station connecting the base station and the mobile terminal, (a) receiving a first frame containing first channel control information including a preamble, an FCH, and a MAP from the base station; (b) constructing a second frame for including the second channel control information and data generated based on the first channel control information and transmitting the same to the lower node; And (c) transmitting the second frame to a lower node; and a communication method using a frame structure for a transparent relay station in an MMR system. The method of claim 1, wherein the second frame A first area including the second channel control information; A second area allocated for the data transmitted to a mobile terminal or a lower relay station connected to the transparent relay station; And an uplink subframe including a burst transmitted from a mobile terminal or a relay station to the base station. 2. The communication method using a frame structure for a transparent relay station in an MMR system, comprising: The method of claim 1 or 2, wherein the second channel control information is And a frame structure for a transparent relay station in an MMR system, the same as the first channel control information. The method of claim 1, wherein step (b) (b1) acquiring synchronization using the preamble; (b2) demodulating the received data based on the MAP information in the first channel control information; And (b3) mapping the demodulated data to the second frame together with the second channel control information to form the second frame; and a transparent relay station in an MMR system, comprising: Communication method using a frame structure for the. The method of claim 2, wherein the second region is Transport in the MMR system, characterized in that the downlink subframe in the first frame received by the base station includes the same data or space-time coded data in the second area that does not include the first channel control information Communication method using frame structure for runt relay station.

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