KR101732548B1 - Apparatus and method for transmitting data usnig random access preamble - Google Patents

Abstract

A data transmission system for transmitting data using a random access preamble is disclosed. The disclosed data transmission system includes a data transmission apparatus that selects a random access preamble according to a value of data, and transmits the selected random access preamble and a data reception apparatus that receives the transmitted random access preamble and determines data according to the received random access preamble Device.

Description

[0001] APPARATUS AND METHOD FOR TRANSMITTING DATA USING RANDOM ACCESS PREAMBLE [0002]

The following embodiments are directed to an apparatus and method for transmitting data, and more specifically, to an apparatus and method for transmitting data using a random access preamble.

In a cellular mobile communication system, a terminal connects to a base station and performs communication. If the terminal is not connected to the base station, the terminal transmits a random access preamble to the base station to attempt connection. A connection procedure using a random access preamble is called a random access procedure (random access procedure). The random access procedure is a procedure in which a terminal sends and receives wireless configuration parameters for accessing a base station, and the terminal does not transmit data to be transmitted to the base station. When the connection to the base station is completed through the random access procedure, the terminal transmits data using a dedicated channel set using a random access procedure.

The random access preamble used in the random access procedure shares the same list between the terminal and the base station, and the terminal performs random access procedure by selecting an arbitrary preamble among random access preambles of a given list.

The following embodiments are intended to transmit data using a random access preamble used in a random access procedure.

The following embodiments are intended to transmit data without a radio access protocol or signaling between a base station and a mobile station.

According to an exemplary embodiment of the present invention, there is provided a preamble decoding apparatus including a preamble storing unit for storing a plurality of random access preambles, a data dividing unit for dividing a data stream into first data and second data, a length of the divided first data, A random access preamble as a data preamble from the stored random access preamble according to the number of the random access preamble and the value of the first data, and a preamble selector for selecting the random access preamble as the data preamble, and transmitting the selected data preamble and the second data to the data receiving apparatus Wherein the data preamble is used for determining a value of the first data in the data receiving apparatus.

Here, the data dividing unit may determine the number of data preambles to be transmitted to the data receiving apparatus according to Equation (1).

[Equation 1]

는 내부의 값 x 보다 더 큰 자연수들 중에서 가장 작은 값을 나타낸다.Where K is the number of selected data preambles, M is the length of the first data, and N is the number of stored random access preambles. Also,

Represents the smallest value among the natural numbers larger than the internal value x.

The preamble selector may further divide the first data into at least one slot according to the number of the selected data preambles, convert the value of the first data included in the re-divided slot into a decimal number, Can be selected as the data preamble.

The transmission unit may further include a receiver, wherein the transmitter transmits the data preamble to the data receiver, and when the receiver receives a response message to the data preamble from the data receiver, To the data receiving apparatus.

Here, if the receiver does not receive the response message within a predetermined time from the transmission time of the data preamble, the transmitter may retransmit the data preamble to the data receiver.

According to another exemplary embodiment, there is provided a data transmission apparatus including a preamble receiving unit for receiving at least one random access preamble from a data transmission apparatus, a data determining unit for determining first data according to the received random access preamble, And a data restoring unit for restoring the data stream by combining the first data and the second data.

Here, the data determination unit may determine the first data from the identifier of the received random access preamble.

The preamble receiving unit may receive a plurality of random access preambles, and the data determining unit may determine the first data by concatenating values corresponding to the identifiers of the received random access preambles.

The apparatus may further include a transmitter for transmitting a response message to the data transmission apparatus in response to the received random access preamble, and the second data may be received in response to the response message.

According to yet another exemplary embodiment, there is provided a method comprising: storing a plurality of random access preambles; dividing a data stream into first data and second data; determining a length of the divided first data, a number of the stored random access preambles And selecting at least one random access preamble among the stored random access preambles as a data preamble according to the value of the first data and transmitting the selected data preamble and the second data to a data receiving apparatus , And the transmitted data preamble is used for determining the value of the first data in the data receiving apparatus.

Here, the dividing step may determine the number of data preambles to be transmitted to the data receiving apparatus according to Equation (2).

&Quot; (2) "

는 내부의 값 x 보다 더 큰 자연수들 중에서 가장 작은 값을 나타낸다.Where K is the number of selected data preambles, M is the length of the first data, and N is the number of stored random access preambles. Also,

Represents the smallest value among the natural numbers larger than the internal value x.

The selecting of the data preamble may further include dividing the first data into at least one slot according to the number of the selected data preambles, converting a value of the first data included in the re-divided slot into a decimal number, And the random access preamble corresponding to the converted decimal number can be selected as the data preamble.

The transmitting step may include transmitting the data preamble to the data receiving apparatus, receiving a response message to the data preamble from the data receiving apparatus, and transmitting the second data to the data receiving apparatus in response to the response message. To the receiving apparatus.

Here, if the response message is not received within a predetermined time from the transmission time of the data preamble, the transmitting step may retransmit the data preamble to the data receiving apparatus.

According to the following embodiments, data can be transmitted using the random access preamble used in the random access procedure.

According to the embodiments described below, data can be transmitted without a radio access protocol or signaling between a base station and a mobile station.

1 is a diagram illustrating a random access procedure using a random access preamble.
2 is a block diagram illustrating the structure of a data transmission apparatus according to an exemplary embodiment.
3 is a diagram illustrating a concept of transmitting data using a random access preamble according to an exemplary embodiment.
4 is a diagram illustrating an exemplary embodiment of transmitting data to a data receiving apparatus using a plurality of random access preambles.
5 is a block diagram showing the structure of a data receiving apparatus for receiving data using a random access preamble according to an exemplary embodiment.
6 is a flowchart illustrating a step-by-step description of a data transmission method according to an exemplary embodiment.
7 is a flowchart illustrating a step-by-step description of a data transmission method according to another exemplary embodiment.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a random access procedure using a random access preamble.

In step 130, the terminal 110 that is not connected to the base station 120 transmits a random access preamble to the base station 120 to access the base station 120. According to one aspect, base station 120 and terminal 110 may share the same set of random access preambles. The UE 110 randomly selects one random access preamble among the stored random access preambles and transmits the selected random access preamble to the base station 120.

In step 140, the base station 120 transmits a random access response message to the terminal 110. According to one aspect, the random access response message may include protocol parameters for the terminal 110 to connect to the base station 120.

In step 150, the terminal 120 transmits an upper layer (L2, L3) message to the base station 110. [ According to one aspect, the upper layer message may include a parameter for the terminal 120 to receive a dedicated channel from the base station 110.

The BS 120 may allocate a dedicated channel to the MS 120 using parameters included in the upper layer message.

In step 160, the base station 120 transmits a contention resolution message to the terminal 110. The contention resolution message may include information on a dedicated channel allocated to the terminal 110. [

The terminal 110 transmits data to the base station 120 using the allocated dedicated channel.

The terminal 110 that is not connected to the base station 120 may transmit data to the base station 120 after the random access procedure with the base station 120 is completed. Complex procedures and signaling are required to transmit small amounts of data. In addition, it is inefficient because the transmission of the repeated random access preamble can not be effectively used.

Hereinafter, the terminal 110 will be referred to as a data transmission apparatus and the base station 120 will be referred to as a data reception apparatus, assuming an uplink of the mobile communication system. However, the embodiment of the present invention is not limited to the mobile communication system, and can be applied to other communication systems to which the random access procedure described in Fig. 1 is applied, in a similar manner.

2 is a block diagram illustrating the structure of a data transmission apparatus according to an exemplary embodiment. The data transmitting apparatus 200 according to the exemplary embodiment includes a preamble storing unit 210, a data dividing unit 220, a preamble selecting unit 230, a transmitting unit 240, and a receiving unit 250.

The preamble storage unit 210 stores a plurality of random access preambles. The random access preambles are preambles used by the data transmission apparatus 200 to connect to the data reception apparatus 260. The preamble storage unit 210 of the data transmission apparatus 200 and the data reception apparatus 260 are connected to the same random access And can share preambles.

Hereinafter, an embodiment in which the data transmission apparatus 200 transmits data to the data reception apparatus using the random access preamble will be described with reference to FIG.

The data division unit 220 receives a data stream to be transmitted from the data transmission apparatus 200 to the data reception apparatus 260. The data dividing unit 220 divides the data stream into first data and second data.

Referring to FIG. 3, the data divider 220 may divide the received data stream 310 into first data 310 and second data 330.

According to one aspect, the data division unit 220 may divide the data stream considering the number of random access preambles stored in the preamble storage unit 210. [ For example, the data divider 220 may determine the length of the first data according to Equation (1).

[Equation 1]

Where M is the length of the first data and N is the number of stored random access preambles.

The data divider 220 can divide the data stream according to the length of the first data determined according to Equation (1). In this case, the data dividing unit 220 may divide the M bits located in the upper part of the data stream into the first data, and divide the other bits into the second data. For example, the preamble storage unit 210 may store 64 preambles. In this case, the data divider 220 can determine the length of the first data to be 6 (log2 (64) = 6), and divide the upper 6 bits in the data stream into the first data.

Referring to FIG. 3, the data dividing unit 220 may divide the upper 6 bits of the data stream into the first data 340 and divide the other data into the second data 350.

The preamble selector 230 selects one random access preamble among the random access preambles stored in the preamble storage unit 210 as a data preamble according to the value of the first data. According to one aspect, the preamble selector 230 may convert the first data to a decimal number and select a random access preamble corresponding to the converted decimal number as a data preamble.

 For example, when the first data is '000011', the preamble selector 230 may convert the first data to a decimal number to calculate '3'. In this case, the preamble selector 230 can select '3' random access preamble among the random access preamble stored in the preamble storage 210 as a data preamble.

According to one aspect, the data transmission apparatus 200 can transmit data to the data reception apparatus 260 using a plurality of data preambles.

Hereinafter, an embodiment in which the data transmission apparatus 200 transmits data to the data reception apparatus using a plurality of random access preambles will be described with reference to FIG.

The data division unit 220 receives a data stream to be transmitted from the data transmission apparatus 200 to the data reception apparatus 260. The data divider 220 divides the data stream 410 into the first data 420 and the second data 430.

According to one aspect, the data dividing unit can determine the number of data preambles to be transmitted to the data receiving apparatus according to Equation (2).

&Quot; (2) "

는 내부의 값 x 보다 더 큰 자연수들 중에서 가장 작은 값을 나타낸다.Here, K is the number of data preambles to be transmitted to the data receiving apparatus, M is the length of the first data, and N is the number of stored random access preambles. Also,

Represents the smallest value among the natural numbers larger than the internal value x.

 In Fig. 4, the first data may be 9 bits. In addition, the number of stored random access preambles may be 16. In this case, the number of data preambles to be transmitted to the data receiving apparatus may be determined to be '3'.

)' 비트마다 분할(441, 442, 443)하여 슬롯을 생성할 수 있다. 만약, 일부 비트(443)들이 '4'비트가 되지 않는 경우에는, 프리앰블 선택부는 특정한 값으로 채워진 비트들(445)을 부가하여 '4'비트의 슬롯을 구성할 수 있다. 도 4에서는 '0'으로 채워진 비트들(445)이 부가되었다.The preamble selector 230 may divide the first data into at least one slot according to the number of data preambles to be transmitted to the data receiving apparatus. Here, the number of slots may be equal to the number of data preambles to be transmitted to the data receiving apparatus. 4, since the number of random access preambles is 16, the preamble selector 230 sets the first data to '4 (

) 'Bits to generate a slot by dividing 441, 442, and 443. If some of the bits 443 are not '4' bits, the preamble selector may construct a '4' bit slot by adding the bits 445 filled with a specific value. In FIG. 4, bits 445 filled with '0' are added.

The preamble selector 230 can select a data preamble in consideration of the number of stored random access preambles. In FIG. 4, the preamble selector 230 can select three data preambles equal to the number of slots.

The preamble selector 230 can select the data preamble according to the value of the divided first data. The preamble selector 230 may convert the value of the first data included in the re-divided slots 441, 442, 443, and 445 into decimal numbers. When '0011', '0101', and '1000' are included in each of the slots 441, 442, 443 and 445, they are converted into decimal numbers to be '3', '5', and '8'. In this case, the preamble selector 230 can select the random access preamble corresponding to the converted decimal number as the data preamble. In FIG. 4, the preamble selector 230 can select the preamble # 3 and the # 5 preamble 462 as the data preamble according to the value of the divided first data. Also, the preamble # 4 can be selected as the data preamble according to the value of the divided first data 443 to which the bits 445 filled with the specific value are added.

The transmitting unit 240 transmits the selected data preamble and the second data to the data receiving apparatus 260. According to one aspect, the transmitting unit 240 may transmit the selected data preamble to the data receiving apparatus 260. In this case, the receiving unit 250 may receive a response message to the data preamble from the data receiving apparatus 260 in response to the transmitted data preamble. Here, the response message may include a protocol parameter for connecting the data transmission apparatus 200 to the data reception apparatus 260.

When the receiving unit 250 receives the response message within a predetermined time from the transmission time of the data preamble, the transmitting unit 240 may transmit the second data to the data receiving device 260 in response to the response message.

However, if the receiving unit 250 fails to receive a response message within a predetermined time from the transmission time of the data preamble, the transmitting unit 240 can retransmit the first data. According to one aspect, the transmission power of the first data to be retransmitted may be a higher value than the transmission power of the previously transmitted first data.

3 and 4, the transmitting unit 240 may transmit the selected data preamble 360 to the data receiving apparatus 260. The transmitting unit 240 may transmit the second data to the data receiving apparatus 260 after the data preamble 360 is transmitted.

The data preamble transmitted to the data receiving apparatus 260 is used to determine the value of the first data in the data receiving apparatus 260. According to one aspect, the data receiving apparatus 260 can determine the value of the first data according to whether a preamble among a plurality of random access preambles is selected as a data preamble.

The data receiving apparatus 260 may recover the data stream from the first data whose values are determined and the second data received.

According to another embodiment, the preamble storing unit 210 stores random access preambles divided into a plurality of groups, and the preamble selecting unit 230 can select random access preambles with different numbers in each group.

For example, the preamble storage unit 210 may store random access preambles by dividing into G random access preamble groups as shown in Equation (3).

&Quot; (3) "

는 i번째의 랜덤 액세스 프리앰블 그룹을 나타낸다.here,

Denotes an i-th random access preamble group.

에 포함된 랜덤 액세스 프리앰블의 개수를

라고 할 수 있다.Each random access preamble group may include at least one random access preamble. In addition, the number of random access preambles included in each random access preamble group may be different. In this case, the i-th random access preamble group

The number of random access preambles included in

.

에서

개의 랜덤 액세스 프리앰블을 선택할 수 있다(

).According to an aspect of the present invention, the preamble selecting unit 230 selects the i < th > random access preamble group

in

Random access preamble can be selected (

).

The transmitting unit 240 transmits the selected random access preambles to the data receiving apparatus 260. In this case, the transmitting unit 240 may transmit the bit number information according to Equation (4) to the data receiving apparatus 260.

&Quot; (4) "

은 데이터 전송 장치(200)가 데이터 수신 장치(260)로 전송하는 데이터의 비트수이고,

는 랜덤 액세스 프리앰블 그룹의 개수이다.here,

Is the number of bits of data that the data transmission apparatus 200 transmits to the data reception apparatus 260,

Is the number of random access preamble groups.

5 is a block diagram showing the structure of a data receiving apparatus for receiving data using a random access preamble according to an exemplary embodiment. The data receiving apparatus 500 according to the exemplary embodiment includes a preamble receiving unit 510, a data determining unit 520, a transmitting unit 530, a data receiving unit 540, and a data recovering unit 550.

The preamble receiving unit 510 receives the random access preamble from the data transmission apparatus 550. Here, the random access preamble received by the preamble receiving unit 510 may be a preamble selected by the data transmitting apparatus 550 as a data preamble.

The data determination unit 520 determines the first data according to the received random access preamble. According to one aspect, the data determination unit 520 may convert the identifier or number of the received random access preamble into binary numbers to determine the first data. For example, when the identifier or the number of the received random access preamble is '3', the data determination unit 520 may determine the value of the first data to be '000011'.

According to one aspect, the preamble receiving unit 510 can receive a plurality of random access preambles. In this case, the data determination unit 520 may determine the first data by concatenating the values corresponding to the identifiers of the received random access preamble.

The transmission unit 530 transmits a response message to the data transmission apparatus 550 in response to the received random access preamble.

The data receiving unit 540 receives the second data from the data transmitting apparatus 550 in response to the transmitted response message.

The data restoring unit 550 may restore the data stream by combining the first data and the second data.

6 is a flowchart illustrating a step-by-step description of a data transmission method according to an exemplary embodiment.

In step 610, the data transmission apparatus stores the random access preamble. According to one aspect, the data transmission apparatus and the data reception apparatus can share the same set of random access preambles.

In step 620, the data transmission device receives the data stream. The data transfer apparatus may divide the data stream into first data and second data. According to one aspect, the data transmission apparatus can determine the number of data preambles to be transmitted to the data receiving apparatus according to the length of the divided first data. According to one aspect, the data transmission apparatus can determine the number of data preambles to be transmitted to the data transmission apparatus according to Equation (3).

&Quot; (5) "

는 내부의 값 x 보다 더 큰 자연수들 중에서 가장 작은 값을 나타낸다.Here, K is the number of data preambles to be transmitted to the data transmission apparatus, M is the length of the first data, and N is the number of stored random access preambles. Also,

Represents the smallest value among the natural numbers larger than the internal value x.

The data transmission apparatus may divide the first data into at least one slot according to the number of data preambles to be transmitted to the data transmission apparatus. Here, the number of slots may be equal to the number of data preambles to be transmitted to the data transmission apparatus.

In step 630, the data transmission apparatus divides the first data into at least one slot according to the number of data preambles to be transmitted to the data receiving apparatus. The data transmission apparatus can convert the value of the first data included in the re-divided slot into a decimal number and select a random access preamble corresponding to the converted decimal number as a data preamble.

In step 640, the data transmission apparatus transmits the selected data preamble and the second data to the data receiving apparatus.

According to another aspect, the data transmission apparatus divides random access preambles into a plurality of groups, and can select random access preambles by changing the number of random access preambles in each group. When the data transmission apparatus transmits the selected random access preambles to the data reception apparatus, the data transmission apparatus can transmit the bit number information according to Equation (6) to the data reception apparatus.

&Quot; (6) "

은 데이터 전송 장치가 데이터 수신 장치로 전송하는 데이터의 비트수이고,

는 데이터 전송 장치가 저장하는 랜덤 액세스 프리앰블 그룹의 개수이다.

는 i번째 랜덤 액세스 프리앰블 그룹에서 선택된 랜덤 액세스 프리앰블의 개수이고,

는 i번째 랜덤 액세스 프리앰블 그룹에 포함된 랜덤 액세스 프리앰블의 개수이다.

Is the number of bits of data transmitted from the data transmission apparatus to the data reception apparatus,

Is the number of random access preamble groups stored in the data transmission apparatus.

Is the number of random access preambles selected in the i < th > random access preamble group,

Is the number of random access preambles included in the i < th > random access preamble group.

A configuration in which the data transmission apparatus transmits the selected data preamble and the second data to the data reception apparatus will be described with reference to FIG.

7 is a flowchart illustrating a step-by-step description of a data transmission method according to another exemplary embodiment.

In step 710, the data transmission apparatus transmits the selected data preamble to the data reception apparatus. Thereafter, the data transmission apparatus waits to receive a response message to the data preamble from the data reception apparatus.

In step 720, the data transmission apparatus receives a response message to the data preamble from the data reception apparatus.

In step 730, the data transmission apparatus determines whether it has received within a predetermined time from the transmission time of the data preamble.

If it is received within a predetermined time, the data transmission apparatus transmits the second data to the data reception apparatus in step 740. The transmitted data preamble is used to determine the value of the first data in the data receiving apparatus, and the transmitted second data is used to recover the data stream together with the first data.

If not, the data transmission apparatus retransmits the data preamble at step 710. If the data preamble is not received within the predetermined time, According to one aspect, the transmission power of the data preamble to be retransmitted may be a value larger than the transmission power of the previously transmitted data preamble.

Also, if the number of retransmissions of the data preamble exceeds a predetermined number, the data transmission apparatus may abandon the connection procedure to the data reception apparatus.

The method according to an embodiment may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions to be recorded on the medium may be those specially designed and configured for the embodiments or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI > or equivalents, even if it is replaced or replaced.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

200: Data transmission device
210: preamble storage unit
220:
230: preamble selector
240:
250: Receiver
260: Data receiving device

Claims (15)

A preamble storing unit for storing a plurality of random access preambles;
A data dividing unit dividing the data stream into first data and second data;
A preamble selector for selecting at least one random access preamble among the stored random access preambles as a data preamble according to the length of the divided first data, the number of the stored random access preamble, and the value of the first data; And
A transmission unit for transmitting the selected data preamble and the second data to a data receiving apparatus,
Lt; / RTI >
Wherein the transmitted data preamble is used by the data receiving apparatus to determine a value of the first data. The method according to claim 1,
Wherein the data dividing unit determines the number of data preambles to be transmitted to the data receiving apparatus according to Equation (1).

[Equation 1]

Where K is the number of selected data preambles, M is the length of the first data, and N is the number of stored random access preambles. Also,

Represents the smallest value among the natural numbers larger than the internal value x. 3. The method of claim 2,
The preamble selector may further divide the first data into at least one slot according to the number of the selected data preambles, convert the value of the first data included in the re-divided slot into a decimal number, and correspond to the converted decimal number And selects a random access preamble as the data preamble. The method according to claim 1,
A receiving unit;
Further comprising:
Wherein the transmitting unit transmits the data preamble to the data receiving apparatus,
When the receiving unit receives a response message for the data preamble from the data receiving apparatus,
And the transmitting unit transmits the second data to the data receiving apparatus. 5. The method of claim 4,
When the receiver fails to receive the response message within a predetermined time from the transmission time of the data preamble,
And the transmitting unit retransmits the data preamble to the data receiving apparatus. A preamble receiving unit for receiving at least one random access preamble from a data transmission apparatus;
A data determination unit for determining first data according to the received random access preamble;
A data receiving unit for receiving second data from the data transmission apparatus; And
A data restoring unit for restoring a data stream by combining the first data and the second data,
And a data receiving unit for receiving the data. 7. The apparatus according to claim 6,
And determines the first data from the identifier of the received random access preamble. 8. The method of claim 7,
Wherein the preamble receiving unit receives a plurality of random access preambles,
Wherein the data determination unit determines the first data by concatenating a value corresponding to the identifier of the received random access preamble. The method according to claim 6,
A transmission unit for transmitting a response message to the data transmission apparatus in response to the received random access preamble,
Further comprising:
And the second data is received in response to the response message. Storing a plurality of random access preambles;
Dividing the data stream into first data and second data;
Selecting at least one random access preamble among the stored random access preambles as a data preamble according to the length of the divided first data, the number of the stored random access preamble, and the value of the first data; And
Transmitting the selected data preamble and the second data to a data receiving apparatus
Lt; / RTI >
Wherein the transmitted data preamble is used by the data receiving apparatus to determine a value of the first data. 11. The method of claim 10,
Wherein the dividing step determines the number of data preambles to be transmitted to the data receiving apparatus according to Equation (2).

&Quot; (2) "

Here, K is the number of data preambles to be transmitted to the data receiving apparatus, M is the length of the first data, and N is the number of stored random access preambles. Also,

Represents the smallest value among the natural numbers larger than the internal value x. 11. The method of claim 10,
Wherein the step of selecting the data preamble further comprises the steps of: dividing the first data into at least one slot according to the number of data preambles to be transmitted to the data receiving apparatus; converting the value of the first data included in the re- And a random access preamble corresponding to the converted decimal number is selected as the data preamble. 11. The method of claim 10,
Transmitting the data preamble to the data receiving apparatus;
Receiving a response message for the data preamble from the data receiving apparatus;
Transmitting the second data to the data receiving apparatus in response to the response message
Further comprising the steps of: 14. The method of claim 13,
When the response message is not received within a predetermined time from the transmission time of the data preamble,
Wherein the transmitting step retransmits the data preamble to the data receiving apparatus. A computer-readable recording medium having recorded thereon a program for executing the method according to any one of claims 10 to 14.

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