KR20100005672A - Device and method for transmitting data - Google Patents

Abstract

PURPOSE: A data transfer equipment and a data communications method for using resource allocation information are provided to efficiently use the resource, transmit resource allocation information and reduce system overhead. CONSTITUTION: A PDU(Packet Data Unit) generating unit(110) processes transmitting data and generates PDU. A transmit unit(120) transmits PDU. The PDU comprises a resource allocation header including resource allocation information and a payload corresponding to transmitted-data. The resource allocation information comprises the information of the resources allocated to data transmitted after the transmitted data.

Description

Data transfer device and data transfer method {DEVICE AND METHOD FOR TRANSMITTING DATA}

The present invention relates to a data transmission apparatus and a data transmission method.

When a base station and a terminal transmit and receive data in a wireless communication system, resource allocation information of downlink and uplink is transmitted through a downlink map and an uplink map. Therefore, when the downlink map or the uplink map is lost, data transmission and reception between the base station and the terminal is impossible. To prevent this, the downlink map and the uplink map use a robust modulation type and a coding rate so as not to be damaged during transmission. However, in this case, the size of the downlink map and the uplink map is increased and accordingly system overhead is increased, thereby reducing the communication system efficiency.

Meanwhile, a hybrid automatic retransmit request (HARQ) scheme using a retransmission scheme in a medium access control (MAC) layer and a link capability of a physical layer as a retransmission scheme of a wireless communication system, for example. There is this. The HARQ scheme is a technique for recovering received data by combining received information of previously transmitted data and retransmitted data. As such HARQ scheme, there are synchronous and asynchronous schemes.

In the synchronous HARQ scheme, a transmission delay increases as the number of retransmissions increases, and a modulation scheme and a coding rate cannot be changed according to channel conditions, and thus resources cannot be efficiently used. Since the asynchronous HARQ scheme transmits resource allocation information using a map every time data is transmitted, system overhead may increase.

The technical problem to be achieved by the present invention is to transmit resource allocation information and efficiently use resources while reducing system overhead.

A data transmission apparatus according to an embodiment of the present invention includes a packet data unit generation unit for processing a transmission data to generate a packet data unit, and a transmission unit for transmitting the packet data unit, wherein the packet data The unit includes a resource allocation header including resource allocation information, and a payload corresponding to the transmission data.

The resource allocation information may include information of resources allocated for data to be transmitted after the transmission data.

The packet data unit may further include a general header that includes control information for the payload.

The resource allocation header further includes a resource allocation header type and a resource indicator indicating whether the resource allocation information is included, and the resource allocation information may exist according to the resource indicator setting.

The resource indicator may include at least one of a downlink resource indicator and an uplink resource indicator.

The resource allocation information may include at least one of downlink resource allocation information and uplink resource allocation information.

The resource allocation information may include information on a modulation type and a coding rate.

The resource allocation header may further include retransmission request information indicator and retransmission information existing according to the setting of the retransmission request information indicator.

The retransmission request may be a hybrid automatic retransmit request (HARQ).

The resource allocation header may further include a check sum for error detection.

A data transmission method according to another embodiment of the present invention is a data transmission method of a data transmission apparatus, the method comprising: generating a packet data unit including a resource allocation header including resource allocation information and a payload corresponding to the first data to be transmitted And transmitting the packet data unit.

The method may further include transmitting second data according to the resource allocation information.

The resource allocation header may include a resource allocation header type, a resource indicator indicating whether the resource allocation information is included, and resource allocation information existing according to the resource indicator setting.

The resource allocation information includes information on a modulation scheme and a coding rate, and the transmitting of the packet data unit may be performed when it is necessary to change the modulation scheme and the coding rate being used.

The resource indicator may include a downlink resource indicator and an uplink resource indicator, and the resource allocation information may include downlink resource allocation information and uplink resource allocation information.

The resource allocation header further includes retransmission information existing according to settings of the retransmission request information indicator and the retransmission request information indicator, wherein the retransmission information indicator includes a downlink retransmission information indicator and an uplink retransmission information indicator. The retransmission information may include downlink retransmission information and uplink retransmission information.

The retransmission request may be HARQ.

A data transmission method according to another embodiment of the present invention is a data transmission method of a transmitting side, the method comprising: transmitting first resource allocation information, transmitting first data using the first resource allocation information, and first And transmitting a resource allocation header including second resource allocation information different from the resource allocation information together with the second data, and transmitting the third data according to the second resource allocation information.

The method may further include receiving a reception result of the first data, and retransmitting the first data when the reception result is a negative acknowledgment (NACK).

The third data may be data that is generated and delayed while retransmitting the first data.

According to the present invention, resource allocation information can be transmitted while reducing system overhead, and resources can be efficiently used by adjusting modulation schemes and coding rates according to channel conditions.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise. In addition, the terms “… unit”, “… unit”, “module”, etc. described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software. have.

In the present specification, a terminal is a mobile station (MS), a mobile terminal (MT), a subscriber station (SS), a portable subscriber station (PSS), a user equipment (User Equipment). It may also refer to a user equipment (UE), an access terminal (AT), and the like, and may include all or some functions of a terminal, a mobile terminal, a subscriber station, a portable subscriber station, a user device, an access terminal, and the like.

In the present specification, a base station (BS) includes an access point (AP), a radio access station (RAS), a node B (Node B), an advanced node B (evolved NodeB, eNodeB), transmission and reception It may also refer to a base transceiver station (BTS), a mobile multihop relay (MMR) -BS, and the like. It may also include.

A data transmission apparatus and a data transmission method according to an embodiment of the present invention will now be described with reference to the drawings.

1 is a schematic block diagram of a data transmission apparatus according to an embodiment of the present invention.

Referring to FIG. 1, the data transmission apparatus 100 is included in a base station or a terminal, and includes a packet data unit (PDU) generation unit 110 and a transmission unit 120.

The packet data unit generation unit 110 processes the data to be transmitted, generates a packet data unit in a data transmission format, and outputs the packet data unit to the transmission unit 120.

The transmitter 120 transmits the packet data unit to the terminal or the base station.

Now, the packet data unit will be described in detail with reference to FIGS. 2 and 3.

2 is a diagram illustrating a packet data unit generated in a data transmission apparatus according to an embodiment of the present invention.

Referring to FIG. 2, the packet data unit 200 transmitted from the data transmission apparatus 100 according to an embodiment of the present invention may include a resource allocation header (RAH) 210 and a general header. 230, 250, payloads 240, 260, and trailer 270.

The resource allocation header 210 is a part including information about a new resource allocation information, modulation scheme, coding rate, and HARQ information when the base station / terminal wants to transmit it to the terminal / base station.

The general headers 230 and 250 are parts for operating and controlling the payloads 240 and 260.

Payloads 240 and 260 are portions corresponding to actual data.

The trailer 270 is a part for information error detection (CRC) for the payloads 240 and 260.

A resource allocation header of a packet data unit according to an embodiment of the present invention will now be described in detail with reference to FIG. 3.

3 is a diagram illustrating a resource allocation header of a packet data unit generated from a data transmission apparatus according to an embodiment of the present invention.

Referring to FIG. 3, the resource allocation header 210 includes a resource allocation header type 211, a downlink resource information indicator 212, and downlink allocation information. downlink) 213, downlink HARQ information indicator 214, downlink HARQ information 215, uplink resource information indicator 216, uplink allocation information 217, uplink HARQ information The indicator 218 includes uplink HARQ information 219 and a checksum 220.

The resource allocation hair type 211 indicates that the header 210 is a resource allocation header that is distinguished from the general headers 230 and 250.

The downlink resource information indicator 212 indicates whether the resource allocation header 210 includes the allocation information for the downlink resource.

The downlink allocation information 213 includes information allocated to downlink, that is, information about a resource allocation block, a modulation scheme, a coding rate, and the like, and exists when the downlink resource information indicator 212 is set.

The downlink HARQ information indicator 214 indicates whether information on the downlink HARQ is included in the resource allocation header 210.

The downlink HARQ information 215 contains information such as a channel ID of an acknowledgment (ACK) or a negative acknowledgment (NACK), and exists when the downlink HARQ information indicator 214 is configured.

The uplink resource information indicator 216 indicates whether the resource allocation header 210 includes allocation information on the uplink resource.

The uplink allocation information 217 includes information allocated to uplink, that is, information about a resource allocation block, a modulation scheme, a coding rate, and the like, and exists when the uplink resource information indicator 216 is set.

The uplink HARQ information indicator 218 indicates whether information on the uplink HARQ is included in the resource allocation header 210.

The uplink HARQ information 219 includes information on an acknowledgment (ACK) or a negative acknowledgment (NACK) transmitted when the base station broadcasts to the terminal, and exists when the uplink HARQ information indicator 218 is set. .

The check sum 220 performs an error detection function of the resource allocation header 210 itself.

A data transmission method according to an embodiment of the present invention will now be described in detail with reference to FIG. 4.

4 is a diagram illustrating a data transmission method according to an embodiment of the present invention.

Referring to FIG. 4, 13 consecutive frames (frame_N, frame_N + 1, frame_N + 2, frame_N + 3, frame_N + 4, frame_N + 5, frame_N + 6, frame_N + 7, frame_N + 8, frame_N + 9, During frame_N + 10, frame_N + 11, frame_N + 12, and frame_N + 13, transmission / reception contents between the base station 300 and the terminal 400 are shown. Each frame (frame_N-frame_N + 13) includes a downlink subframe (DL) and an uplink subframe (UL).

First, when data (Data1) to be transmitted to the terminal 400 is generated in the base station 300 (401), the base station 300 allocates resources to the downlink subframe DL and includes the allocation information in the downlink map DL_MAP. Broadcast to all terminals (402) and transmit data (Data1) using the allocated downlink resources (403).

Then, after receiving the downlink map DL_MAP, the terminal 400 receives the data Data1 using the allocation information and transmits an acknowledgment (ACK) or a negative response (NACK) to the base station 300 ( 420). In the present embodiment, it is assumed that the terminal 400 does not normally receive data Data1 and thus sends a negative acknowledgment (NACK) to the base station 300.

Subsequently, when new data Data2 is transmitted to the base station 300 to the terminal 400 (404), the data Data2 is stored in a buffer (405), and the data Data1 that was not normally received previously is retransmitted ( 406).

Then, the terminal 400 receives the data Data1 and transmits an acknowledgment (ACK) or a negative response (NACK) to the base station 300 (421). In the present embodiment, it is assumed that the terminal 400 has not normally received the data Data1 once again and has sent a negative acknowledgment (NACK) to the base station 300.

Subsequently, when another new data Data3 is transmitted to the base station 300 to the terminal 400 (407), the data Data3 is stored together with the data Data2 in the buffer (408), and the data Data1 is stored. Retransmit (409).

Then, the terminal 400 receives the data Data1 and transmits an acknowledgment (ACK) or a negative response (NACK) to the base station 300 (422). In the present embodiment, it is assumed that the terminal 400 normally receives data Data1 and sends an acknowledgment ACK to the base station 300.

Subsequently, when another new data (Data4) to be transmitted to the base station (300) is generated (410), the data (Data3, Data4) is stored in a buffer (411), the resource allocation header (RAH1) and The data Data2 is transmitted (412). That is, the base station 300 transmits data Data2 in the form of a packet data unit including a resource allocation header RAH1 (412). At this time, the base station 300 allocates resources for transmitting data (Data3, Data4) stored in the buffer at once (in the example of FIG. 4, allocates resources to the frame (frame_N + 8)), and a resource allocation header ( RAH1) includes resource allocation information for data Data3 and Data4. In this case, the downlink resource information indicator 212 of the resource allocation header RAH1 may be set, and the resource allocation information for the data Data3 and Data4 may be contained in the downlink allocation information 213.

Then, the terminal 400 receives the resource allocation header RHA1 and the data Data2 and transmits an acknowledgment (ACK) or a negative response (NACK) to the base station 300 (423). In this case, the downlink HARQ information indicator 214 of the resource allocation header RAH1 may be set, and the downlink HARQ information 215 may include channel information about an acknowledgment (ACK) or a negative response (NACK). In the present embodiment, it is assumed that the terminal 400 normally receives the resource allocation header RHA1 and the data Data2 and sends an acknowledgment ACK to the base station 300.

Subsequently, when another new data Data5 is transmitted to the base station 300 to the terminal 400 (413), the data Data5 is stored in a buffer (414), and the resource allocation header RHA1 transmitted previously is included. The data Data3 and Data4 are simultaneously transmitted according to the resource allocation information (415).

Then, the terminal 400 receives data Data3 and Data4 and transmits an acknowledgment (ACK) or a negative response (NACK) to the base station 300 (424). In the present embodiment, it is assumed that the terminal 400 normally receives data Data3 and Data4 and sends an acknowledgment ACK to the base station 300.

Subsequently, when another new data (Data6) to be transmitted to the base station 300 to the terminal 400 occurs (416), the resource allocation header (RAH2) and data (Data5, Data6) is transmitted (417). That is, the base station 300 transmits data Data5 and Data6 in the form of a packet data unit including a resource allocation header RAH2. In this case, the resource allocation header RAH2 includes the resource allocation information reduced so that only data that is generated thereafter may be transmitted since there is no data stored in the buffer because the current transmission is delayed. That is, the base station 300 allocates resources for transmitting newly generated data Data7 stored in the buffer (in the example of FIG. 4, allocates resources to the frame frame_N + 12), and resource allocation header ( RAH2) includes resource allocation information for data Data7. In this case, the downlink resource information indicator 212 of the resource allocation header RAH2 may be set, and the resource allocation information for the data Data7 may be contained in the downlink allocation information 213.

Then, the terminal 400 receives data Data5 and Data6 and transmits an acknowledgment (ACK) or a negative response (NACK) to the base station 300 (425). In the present embodiment, it is assumed that the terminal 400 normally receives data Data5 and Data6 and sends an acknowledgment ACK to the base station 300.

Subsequently, when another new data Data7 to be transmitted to the base station 300 is transmitted to the terminal 400 (418), the base station 300 uses the downlink resource allocated according to the resource allocation header RAH2 to transmit the data Data7. Send (419). Then, the terminal 400 receives the data Data7 and transmits an acknowledgment (ACK) or a negative response (NACK) to the base station 300 (426).

By maintaining the resource allocation information variably as described above, data transmission delay due to retransmission can be reduced, and the system uses resource allocation headers RAH1 and RAH2 transmitted together with the data without using a map to change the resource allocation information. Overhead can be reduced.

Although not described in FIG. 4, when the terminal 400 generates data to be transmitted to the base station 300, the terminal 400 requests resource allocation to the base station 300, and accordingly, the base station 300 allocates uplink resources and assigns the uplink resource. Is included in the uplink map and broadcasted to all terminals. The terminal 300 transmits uplink data if there is an allocated resource after receiving the uplink map. In the uplink subframe (UL), like the downlink subframe (DL), a resource allocation header may be transmitted along with data to variably maintain resource allocation information. In this case, the uplink resource information indicator 216 of the resource allocation header may be set, and the resource allocation information for the data may be contained in the uplink allocation information 217. In addition, the uplink HARQ information indicator 218 of the resource allocation header may be set, and the uplink HARQ information 219 may include channel information about an acknowledgment (ACK) or a negative response (NACK).

A data transmission method according to another embodiment of the present invention will now be described in detail with reference to FIG. 5.

5 is a diagram illustrating a data transmission method according to another embodiment of the present invention.

Referring to FIG. 5, during a sequence of nine frames (frame_N, frame_N + 1, frame_N + 2, frame_N + 3, frame_N + 4, frame_N + 5, frame_N + 6, frame_N + 7, frame_N + 8), the base station ( The transmission and reception between the 300 and the terminal 400 is shown. Each frame (frame_N-frame_N + 8) includes a downlink subframe (DL) and an uplink subframe (UL).

First, when data (Data1) to be transmitted to the terminal 400 is generated in the base station 300 (501), the base station 300 allocates resources to the downlink subframe DL, and assigns the allocation information to the downlink map DL_MAP. It includes and broadcasts to all terminals (502), and transmits the data (Data1) by using the allocated downlink resources (503). Then, after receiving the downlink map DL_MAP, the terminal 400 receives the data Data1 using the allocation information and transmits an acknowledgment (ACK) or a negative response (NACK) to the base station 300 ( 520). In the present embodiment, it is assumed that the terminal 400 normally receives data Data1 and sends an acknowledgment ACK to the base station 300.

Subsequently, when new data Data2 to be transmitted to the terminal 400 is generated in the base station 300 (504), the base station 300 transmits data (Data2) (505). Then, the terminal 400 receives data Data2 and transmits an acknowledgment (ACK) or a negative response (NACK) to the base station 300 (521). In the present embodiment, it is assumed that the terminal 400 normally receives data Data2 and sends an acknowledgment ACK to the base station 300.

Subsequently, when new data (Data3) to be transmitted to the base station 300 to the terminal 400 is generated (504), and the downlink channel situation is changed and it is necessary to change the modulation scheme and coding rate (507), such information is provided as a resource. It is included in the allocation header RAH3 and transmitted together with the data Data3 (507). The base station 300 transmits data Data3 in the form of a packet data unit including a resource allocation header RHA3. That is, the base station 300 allocates resources for the new modulation scheme and coding rate (in the example of FIG. 5, allocates resources to the frame frame_N + 5), and the resource allocation header RAH3 designates the new modulation scheme and encoding. Contains resource allocation information for the rate. In this case, the downlink resource information indicator 212 of the resource allocation header RAH2 may be set, and the downlink allocation information 213 may include resource allocation information for a new modulation scheme and coding rate.

After receiving the acknowledgment (ACK) from the terminal 400, after the data (4, 5) generated thereafter to be transmitted (508, 510), the base station 300 changes the modulation scheme according to the resource allocation header (RAH3) and Data (Data4, Data5) is transmitted according to the coding rate (509, 511). Then, the terminal 400 receives the data (Data4, Data5) using the information included in the resource allocation header (RAH3) and transmits whether or not the normal reception (523, 524).

On the other hand, the acknowledgment (ACK) of the terminal 400 is transmitted to the base station 300, in which case the downlink HARQ information indicator 214 of the resource allocation header (RAH3) is set, and the positive HARQ information (215) Channel information about an acknowledgment (ACK) or a negative acknowledgment (NACK) may be included.

As described above, according to the present invention, when it is necessary to change the modulation scheme and the coding rate according to the channel situation, the system reduces the map size by providing the change information using the resource allocation header transmitted with the data without using a separate map. Overhead can be reduced.

The embodiments of the present invention described above are not only implemented through the apparatus and the method, but may be implemented through a program for realizing a function corresponding to the configuration of the embodiments of the present invention or a recording medium on which the program is recorded.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

1 is a schematic block diagram of a data transmission apparatus according to an embodiment of the present invention.

2 is a diagram illustrating a packet data unit generated in a data transmission apparatus according to an embodiment of the present invention.

3 is a diagram illustrating a resource allocation header of a packet data unit generated from a data transmission apparatus according to an embodiment of the present invention.

4 is a diagram illustrating a data transmission method according to an embodiment of the present invention.

5 is a diagram illustrating a data transmission method according to another embodiment of the present invention.

Claims (20)

A packet data unit generation unit for processing the transmission data to generate a packet data unit, and Transmitter for transmitting the packet data unit Including, The packet data unit, A resource allocation header including resource allocation information, and Payload corresponding to the transmission data Containing Data transmission device. In claim 1, And the resource allocation information includes information of resources allocated for data to be transmitted after the transmission data. In claim 1, The packet data unit further comprises a general header containing control information for the payload. In claim 1, The resource allocation header, The resource allocation header type, and Resource indicator indicating whether the resource allocation information is included (resource indicator) More, The resource allocation information is present according to the resource indicator setting Data transmission device. In claim 4, The resource indicator includes at least one of a downlink resource indicator and an uplink resource indicator. In claim 5, The resource allocation information includes at least one of downlink resource allocation information and uplink resource allocation information. In claim 5 or 6, The resource allocation information includes information on a modulation type and a coding rate. In claim 4, The resource allocation header, A retransmission request information indicator, and Retransmission information present according to the setting of the retransmission request information indicator Containing more Data transmission device. In claim 8, The retransmission request is a hybrid automatic retransmit request (HARQ). In claim 4, The resource allocation header further includes a check sum for error detection. A data transmission method of a data transmission device, Generating a packet data unit comprising a resource allocation header comprising resource allocation information and a payload corresponding to the first data to be transmitted, and Transmitting the packet data unit Data transmission method comprising a. The method of claim 11, And transmitting second data according to the resource allocation information. In claim 11, The resource allocation header, Resource allocation header type, A resource indicator indicating whether the resource allocation information is to be included, and Resource allocation information existing according to the resource indicator setting Containing Data transfer method. In claim 13, The resource allocation information includes information on a modulation scheme and a coding rate. The transmitting of the packet data unit is performed when it is necessary to change the modulation scheme and the coding rate being used. In claim 13, The resource indicator includes a downlink resource indicator and an uplink resource indicator, and the resource allocation information includes downlink resource allocation information and uplink resource allocation information. In claim 13, The resource allocation header further includes retransmission information existing according to the settings of the retransmission request information indicator and the retransmission request information indicator. The retransmission information indicator includes a downlink retransmission information indicator and an uplink retransmission information indicator, The retransmission information includes downlink retransmission information and uplink retransmission information. Data transfer method. The method of claim 16, And the retransmission request is HARQ. As a data transmission method on the sender side, Transmitting first resource allocation information, Transmitting first data using the first resource allocation information; Transmitting a resource allocation header including second resource allocation information different from the first resource allocation information together with second data; and Transmitting third data according to the second resource allocation information Data transmission method comprising a. The method of claim 18, Receiving a result of receiving the first data, and Retransmitting the first data when the reception result is a negative acknowledgment (NACK) Data transmission method further comprising. The method of claim 19, And the third data is data generated and delayed while retransmitting the first data.

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