KR101741714B1 - Apparatus and method for transmitting data - Google Patents

Apparatus and method for transmitting data Download PDF

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Publication number
KR101741714B1
KR101741714B1 KR1020160016926A KR20160016926A KR101741714B1 KR 101741714 B1 KR101741714 B1 KR 101741714B1 KR 1020160016926 A KR1020160016926 A KR 1020160016926A KR 20160016926 A KR20160016926 A KR 20160016926A KR 101741714 B1 KR101741714 B1 KR 101741714B1
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South Korea
Prior art keywords
terminal
data
receiving terminal
transmitting
receiving
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KR1020160016926A
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Korean (ko)
Inventor
김선우
이재훈
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한양대학교 산학협력단
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0226—Traffic management, e.g. flow control or congestion control based on location or mobility
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0231—Traffic management, e.g. flow control or congestion control based on communication conditions
    • H04W28/0236—Traffic management, e.g. flow control or congestion control based on communication conditions radio quality, e.g. interference, losses or delay

Abstract

The present invention relates to a method and apparatus for data transmission. More specifically, a method for transmitting data by a terminal includes receiving the mobility information of the receiving terminal from a receiving terminal that receives the data, using the mobility information of the received receiving terminal, Determining a frame length for the data transmission based on the static time characteristic of the calculated radio channel and transmitting the data to the receiving terminal with the determined frame length, . ≪ / RTI >

Figure R1020160016926

Description

[0001] APPARATUS AND METHOD FOR TRANSMITTING DATA [0002]

The present invention relates to a method and apparatus for data transmission, and more particularly to a method for transmitting data to a mobile terminal in a wireless network.

A conventional link adaptation / data transmission adaptation technique uses modulation and coding rate scheme (MCS) information fed back by a receiving terminal to grasp the state of a radio channel in a MAC (Media Access Control) layer, . In order to obtain the maximum gain from the change of the channel, feedback is requested to check the state of the channel between the terminals and analyzed.

When the status of the channel is good, the data is transmitted by increasing the data transmission rate. On the contrary, when the channel status is not good, the data transmission rate is decreased and the data is transmitted.

When the terminal moves at high speed, the state of the wireless channel changes quickly. Accordingly, the status of the channel changes more quickly than the time taken until the application of the information received by the feedback request takes longer, and the information received by the feedback request becomes unavailable.

Therefore, if the mobility of the terminal is increased and the static time characteristic period of the wireless channel is shortened, the channel state is different when the state of the channel is detected and when the state of the transmission is changed.

According to the present invention, the data transmission terminal receives the mobility information of the terminal receiving the data, and the length of the frame for data transmission based on the channel characteristics for data transmission calculated according to the mobility information And to provide a method and an apparatus for transmitting and receiving data.

It is another object of the present invention to provide a method and apparatus for improving the bit error rate (BER) performance in a wireless system having high mobility by transmitting data by adjusting the length of a frame according to the calculated channel characteristics .

According to another aspect of the present invention, there is provided a method for transmitting data by a terminal, the method comprising: receiving mobility information of a receiving terminal from a receiving terminal that receives data; Determining a static time characteristic of a wireless channel used for data transmission; determining a frame length for the data transmission based on the static time characteristic of the calculated wireless channel; And transmitting the data to the receiving terminal.

According to another aspect of the present invention, there is provided a terminal for transmitting data, comprising: a communication unit for receiving mobility information of a receiving terminal from a receiving terminal for receiving data; Determines a frame length for the data transmission based on the calculated static time characteristic of the wireless channel and transmits the data to the receiving terminal through the communication unit with the determined frame length And a controller for controlling the terminal.

According to another aspect of the present invention, there is provided a method of receiving data from a terminal, the method comprising: acquiring mobility information of the terminal through a sensor included in the terminal; transmitting a first preamble signal including the obtained mobility information, To the transmitting terminal, and receiving, from the transmitting terminal, data of a frame length determined based on the mobility information by the transmitting terminal.

According to another aspect of the present invention, there is provided a terminal for receiving data, comprising: a communication unit for transmitting and receiving a sensor, a signal or data for acquiring mobility information of the terminal; and a first preamble signal including mobility information obtained through the sensor And transmits the generated first preamble signal to a transmission terminal that transmits the data through the communication unit, and transmits, from the transmission terminal, data of a frame length determined based on the mobility information by the transmission terminal, And a control unit receiving the information through the communication unit.

As described above, according to the present invention, a terminal transmitting data receives mobility information of a terminal receiving data, and a terminal transmitting data receives mobility information of a terminal receiving data, The length of a frame for data transmission is adjusted based on channel characteristics for data transmission, thereby improving communication performance.

In addition, the present invention provides an effect of improving the bit error rate (BER) performance in a wireless system having high mobility by transmitting data by adjusting a frame length according to the calculated channel characteristics . Thus, terminals can transmit and receive stable data even in a wireless system having high mobility.

1 is a block diagram illustrating a structure of a transmission terminal for transmitting data according to various embodiments of the present invention.
2 is a flow diagram of a data transmission method in accordance with various embodiments of the present invention.
3 is a flow diagram of a method for calculating static time characteristics of a wireless channel in accordance with various embodiments of the present invention.
4 is a block diagram illustrating a structure of a receiving terminal for receiving data according to various embodiments of the present invention.
5 is a flow diagram of a data receiving method in accordance with various embodiments of the present invention.
6 is a flow diagram of a method of transmitting and receiving data in accordance with various embodiments of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected."

The transmission terminal and the reception terminal in the present specification mean a subject that transmits and receives data, respectively, and includes a terminal, a base station, a vehicle communication device, a train communication device, and the like. In one example, both the transmitting terminal and the receiving terminal may be vehicle communication devices or terminals. As another example, the transmitting terminal may be a base station, and the receiving terminal may be a vehicle communication device or a terminal. Accordingly, in this specification, a transmitting terminal means a subject for transmitting data, and a receiving terminal means a subject receiving data.

1 is a block diagram illustrating a structure of a transmission terminal for transmitting data according to various embodiments of the present invention.

According to various embodiments of the present invention, the transmitting terminal 100 for transmitting data may include a communication unit 110 and a control unit 120. [

According to various embodiments of the present invention, the communication unit 110 may transmit and receive data or signals through a wireless network. Also, the communication unit 110 may receive the mobility information of the receiving terminal from the receiving terminal that receives the data transmitted by the transmitting terminal 100.

The mobility information may be information indicating the mobility of the receiving terminal, such as the speed of the receiving terminal. The mobility information may be information indicating mobility of the surrounding environment of the receiving terminal. For example, the mobility information may be information on mobility such as the speed of the train when the user of the receiving terminal is boarding the train.

The mobility information may be included in a first preamble signal transmitted from the receiving terminal to the transmitting terminal 100. Accordingly, the transmitting terminal 100 can receive the first preamble signal from the receiving terminal and confirm the mobility information of the receiving terminal included in the first preamble signal.

According to various embodiments of the present invention, the controller 120 may calculate the static time characteristic of the wireless channel used for the data transmission, using the mobility information of the receiving terminal received through the communication unit 110 have.

When there is mobility in the terminal receiving the data, the terminal transmitting the data or the surrounding environment, the channel state for data transmission changes with time. Accordingly, mobility information received from the receiving terminal can be used to calculate the static time characteristic of the wireless channel in order to increase the data transmission performance.

In one embodiment, the controller 120 may calculate the Doppler spreading frequency due to the movement of the receiving terminal using the mobility information. For example, the control unit 120 may calculate a Doppler spreading frequency that indicates the effect that a radio channel for transmitting data is changed over time due to the movement of the receiving terminal, and that spreads in frequency.

Also, the controller 120 may calculate the static time characteristic of the wireless channel based on the calculated Doppler spreading frequency.

 A concrete method of calculating the Doppler spreading frequency using the mobility information and calculating the static time characteristic of the wireless channel based on the calculated Doppler spreading frequency will be described later.

The control unit 120 may determine a length of a frame for transmitting the data based on the static time characteristic of the calculated radio channel. The control unit 120 may determine the frame length to correspond to the static time characteristic of the calculated radio channel to improve the data transmission performance.

The control unit 120 may determine the length of the frame so that data can be transmitted in a static time characteristic of the calculated radio channel, for example, a static time period of the radio channel.

In one embodiment, the control unit 120 may determine the length of the frame using the static time characteristic of the calculated radio channel and the symbol period of data to be transmitted. For example, the controller 120 may divide the static time characteristic of the calculated radio channel by the data symbol period, and determine a value corresponding to a quotient of the divided value as the length of the frame. A concrete method of determining the frame length based on the static time characteristic of the wireless channel by the controller 120 will be described later.

The control unit 120 may transmit the data to the receiving terminal through the communication unit 110 with the determined frame length. In addition, the controller 120 may generate a second preamble signal including information on the determined frame length. The control unit 120 may generate the second preamble signal to provide information on the determined frame length to the receiving terminal. The control unit 120 may transmit the generated second preamble signal to the receiving terminal.

Accordingly, the transmission terminal 100 can reliably transmit data even in a wireless system having high mobility, and can perform stable data transmission by improving the performance of a BER that has been problematic in a wireless system having high mobility .

2 is a flow diagram of a data transmission method in accordance with various embodiments of the present invention.

In operation 210, the transmitting terminal 100 may receive the mobility information of the receiving terminal from the receiving terminal. The mobility information may be information indicating the mobility of the receiving terminal, such as the speed of the receiving terminal.

The mobility information is included in the first preamble signal and is received from the receiving terminal, and the transmitting terminal 100 can check the mobility information of the receiving terminal included in the received first preamble signal.

In operation 220, the transmitting terminal 100 may calculate the static time characteristic of the wireless channel used for the data transmission, using the mobility information of the receiving terminal.

When there is mobility in the terminal receiving the data, the terminal transmitting the data or the surrounding environment, the channel state for data transmission changes with time. Accordingly, mobility information received from the receiving terminal can be used to calculate the static time characteristic of the wireless channel in order to increase the data transmission performance.

In operation 230, the transmitting terminal 100 may determine the length of the frame for transmitting the data based on the static time characteristic of the wireless channel. The control unit 120 may determine the frame length to correspond to the static time characteristic of the calculated radio channel to improve the data transmission performance.

In operation 240, the data may be transmitted to the receiving terminal through the communication unit 110 with the determined frame length. Accordingly, the transmission terminal 100 can reliably transmit data even in a wireless system having high mobility, and can perform stable data transmission by improving the performance of a BER that has been problematic in a wireless system having high mobility .

3 is a flow diagram of a method for calculating static time characteristics of a wireless channel in accordance with various embodiments of the present invention.

In operation 310, the transmitting terminal 100 may calculate the Doppler spreading frequency by the movement of the receiving terminal using the mobility information received from the receiving terminal.

In one embodiment, the transmitting terminal may calculate the Doppler spreading frequency using Equation 1 using the mobility information of the receiving terminal.

Figure 112016014446987-pat00001

Here, fc represents the center frequency, v represents the mobility information of the terminal, and c represents the speed of light (3 * 10 8 m / s). In this manner, the transmission terminal 100 can calculate the Doppler spreading frequency fm using Equation 2 using the mobility information of the receiving terminal.

In operation 320, the transmitting terminal 100 may calculate the static time characteristic of the wireless channel based on the calculated Doppler spreading frequency.

In one embodiment, the transmission terminal 100 may calculate the static time characteristic of the wireless channel using Equation (2) using the calculated Doppler spreading frequency.

Figure 112016014446987-pat00002

Where T C is the static time characteristic of the wireless channel and fm is the Doppler spreading frequency. The transmission terminal 100 can calculate the static time characteristic of the wireless channel using the calculated Doppler spreading frequency fm.

Also, the transmission terminal 100 can determine the length of a frame for transmitting the data based on the static time characteristic of the calculated radio channel. The controller 120 may determine the length of the frame according to Equation (3) so as to correspond to the static time characteristic of the calculated radio channel in order to improve the data transmission performance.

Figure 112016014446987-pat00003

Here, F L represents the maximum length of the frame corresponding to the static time characteristic of the calculated radio channel, T c represents the static time characteristic of the calculated radio channel, and T b represents the data symbol period.

As described above, the transmission terminal 100 can determine the frame length as a quotient of a value obtained by dividing the data symbol period by the static time characteristic of the calculated radio channel. In addition, the transmission terminal 100 may also determine the length of the frame to the maximum length (F L) of the frame, the length of any frame within the maximum length of the frame (F L) can also determine the length of the frame.

4 is a block diagram illustrating a structure of a receiving terminal for receiving data according to various embodiments of the present invention.

According to various embodiments of the present invention, the receiving terminal 400 for receiving data may include a sensor 410, a communication unit 420, and a controller 430.

According to various embodiments of the present invention, the sensor 410 may obtain mobility information of the receiving terminal 400.

The mobility information may be information indicating the mobility of the receiving terminal, such as the speed of the receiving terminal. The mobility information may be information indicating mobility of the surrounding environment of the receiving terminal. For example, the mobility information may be information on mobility such as the speed of the train when the user of the receiving terminal is boarding the train.

According to various embodiments of the present invention, the communication unit 420 may transmit and receive data or signals through a wireless network. The communication unit 420 transmits the first preamble signal under the control of the controller 430 and receives at least one of the data and the second preamble signal from the transmission terminal 100, .

According to various embodiments of the present invention, the controller 430 may generate a first preamble signal including mobility information of the receiving terminal 400 obtained through the sensor 410. [ The controller 430 may generate a first preamble signal including mobility information for smooth data transmission / reception.

The controller 430 may transmit the first preamble signal including the mobility information to the transmitting terminal 100 through the communication unit 420.

According to various embodiments of the present invention, the controller 430 may receive the data of the frame length determined based on the mobility information by the transmission terminal through the communication unit 420.

In addition, the controller 430 may receive a second preamble signal including information on the frame length from the transmission terminal through the communication unit 420. [

In one embodiment, the controller 430 confirms the information on the frame length determined by the transmission terminal included in the second preamble signal, and transmits the frame length information to the transmission terminal The data of the frame length determined by the frame length can be received.

Accordingly, the receiving terminal 400 can reliably receive data even in a wireless system having high mobility, and can improve the performance of a problem BER in a wireless system having high mobility, have.

5 is a flow diagram of a data receiving method in accordance with various embodiments of the present invention.

In operation 510, the receiving terminal 400 may acquire the mobility information of the receiving terminal 400 through the sensor included in the receiving terminal 400.

The mobility information may be information indicating the mobility of the receiving terminal, such as the speed of the receiving terminal. The mobility information may be information indicating mobility of the surrounding environment of the receiving terminal. For example, the mobility information may be information on mobility such as the speed of the train when the user of the receiving terminal is boarding the train.

In operation 520, the receiving terminal 400 generates a first preamble signal including mobility information of the receiving terminal 400 obtained through the sensor, and transmits the generated first framed signal to the transmitting terminal 100 Lt; / RTI > The receiving terminal 400 may generate a first preamble signal including mobility information for smooth data transmission / reception in a wireless system having high mobility.

In operation 530, the receiving terminal 400 may receive data of a frame length determined by the transmitting terminal from the transmitting terminal 100 based on the mobility information. Also, the receiving terminal 400 may receive a second preamble signal including information on the frame length from the transmitting terminal.

The receiving terminal 400 checks the information on the frame length determined by the transmitting terminal included in the second preamble signal, and determines the frame length determined by the transmitting terminal based on the information on the confirmed frame length Can be received.

6 is a flow diagram of a method of transmitting and receiving data in accordance with various embodiments of the present invention.

6, a method of transmitting and receiving data between the transmitting terminal 100 and the receiving terminal 400 will be described in general.

In operation 610, the receiving terminal 400 may acquire the mobility information of the receiving terminal 400 through the sensor included in the receiving terminal 400.

In operation 620, the receiving terminal 400 generates the first preamble signal including the mobility information of the receiving terminal 400 acquired through the sensor, and transmits the generated first frameble signal To the transmission terminal 100.

The transmitting terminal 100 may receive a first preamble signal including the mobility information from the receiving terminal 400. [ The transmitting terminal 100 can check the mobility information of the receiving terminal included in the received first preamble signal.

In operation 630, the transmitting terminal 100 may calculate the static time characteristic of the wireless channel used for the data transmission, using the mobility information of the receiving terminal. The specific method of calculating the static time characteristic of the radio channel using the mobility information is the same as that described above, so that a detailed description thereof will be omitted.

In operation 640, the transmitting terminal 100 may determine the length of a frame for transmitting the data based on the static time characteristic of the wireless channel calculated in operation 630. [ The control unit 120 may determine the frame length to correspond to the static time characteristic of the calculated radio channel to improve the data transmission performance.

In operation 650, the transmitting terminal 100 may transmit the data to the receiving terminal through the communication unit 110 with the determined frame length. Also, the transmission terminal 100 generates the second preamble signal to provide information on the determined frame length to the receiving terminal 400, and transmits the generated second preamble signal to the receiving terminal 400 .

The receiving terminal 400 checks the information on the frame length determined by the transmitting terminal included in the second preamble signal, and determines the frame length determined by the transmitting terminal based on the information on the confirmed frame length Can be received.

It is to be understood that the terms "comprises", "comprising", or "having" as used in the foregoing description mean that the constituent element can be implanted unless specifically stated to the contrary, But should be construed as further including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (16)

A method for a terminal to transmit data,
Receiving mobility information of a receiving terminal from a receiving terminal that receives data;
Calculating a static time characteristic of a wireless channel used for the data transmission using the mobility information of the received receiving terminal;
Determining a frame length for the data transmission based on a static time characteristic of the calculated radio channel; And
And transmitting the data to the receiving terminal with the determined frame length,
The mobility information includes:
Wherein the receiving terminal is included in a first preamble signal transmitted to the terminal.
delete The method according to claim 1,
The mobility information includes:
And information indicating a speed of the receiving terminal. The method according to claim 1,
Wherein the step of calculating the static time characteristic of the wireless channel comprises:
Calculating a Doppler spreading frequency due to movement of the receiving terminal using the mobility information; And
Calculating a static time characteristic of the radio channel based on the calculated Doppler spreading frequency
And transmitting the data. The method according to claim 1,
Wherein determining the frame length comprises:
Wherein the length of the frame is determined using a static time characteristic of the calculated radio channel and a symbol period of the data. 6. The method of claim 5,
The length of the frame,
And determining a quotient of a value obtained by dividing a static time characteristic of the calculated radio channel by a symbol period of the data. The method according to claim 1,
And further transmitting a second preamble signal including information on the determined frame length to the receiving terminal. In a terminal for transmitting data,
A communication unit that receives mobility information of a receiving terminal from a receiving terminal that receives data; And
Calculating a static time characteristic of the wireless channel used for the data transmission using the mobility information of the received reception terminal and calculating a frame length for the data transmission based on the static time characteristic of the calculated wireless channel And transmitting the data to the receiving terminal through the communication unit at the determined frame length,
The mobility information includes:
Wherein the receiving terminal is included in a first preamble signal transmitted to the terminal. delete 9. The method of claim 8,
Wherein,
Calculates the Doppler spreading frequency due to the movement of the receiving terminal by using the mobility information, and calculates the static time characteristic of the wireless channel based on the calculated Doppler spreading frequency. 9. The method of claim 8,
Wherein,
And determines a length of the frame using a static time characteristic of the calculated radio channel and a symbol period of the data. 9. The method of claim 8,
Wherein,
And transmits a second preamble signal including information on the determined frame length to the receiving terminal through the communication unit. In a method for a terminal to receive data,
Acquiring mobility information of the terminal through a sensor included in the terminal;
Transmitting a first preamble signal including the acquired mobility information to a transmitting terminal that transmits data; And
Receiving, from the transmitting terminal, data of a frame length determined based on the mobility information by the transmitting terminal
And transmitting the data. 14. The method of claim 13,
Receiving, from the transmitting terminal, a second preamble signal including information on the frame length
Further comprising the steps of: 15. The method of claim 14,
Confirming information on a frame length determined by the transmission terminal included in the second preamble signal
Further comprising the steps of: 16. The method of claim 15,
Wherein the receiving the data comprises:
And receiving frame length data determined by the transmission terminal based on the information on the confirmed frame length.
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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100942814B1 (en) * 2009-02-04 2010-02-18 코아글림 주식회사 Method for wireless lan communication supporting movability

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100942814B1 (en) * 2009-02-04 2010-02-18 코아글림 주식회사 Method for wireless lan communication supporting movability

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